Aim Salvia miltiorrhiza Bunge （SM） and lignum dalbergiae odoriferae （DO） are both traditional Chi- nese medicine that have cardioprotective effects. Here, we further examined the combined effects of SM and DO on r...Aim Salvia miltiorrhiza Bunge （SM） and lignum dalbergiae odoriferae （DO） are both traditional Chi- nese medicine that have cardioprotective effects. Here, we further examined the combined effects of SM and DO on rat myocardial ischemia/reperfusion injury. The possible mechanism of SM and DO also were elucidated. Methods DO was divided into aqueous extract of lignum dalbergiae odoriferae （DOW） and lignum dalbergiae odoriferae oil （DOO）. Sprague-Dawley rats were randomized to seven groups： sham group, model group, treatment groups inclu- ding SM （10 g · kg^-1）, DOW （5 g · kg^-1）, DOO （0.5 ml · kg^-1）, SM ＋ DOW （10 g · kg^-1 ＋ 5 g · kg^-1）, SM ＋ DOO （ 10 g · kg^-1 ＋ 0. 5 ml · kg^-1）. Rats were pretreated with homologous drug for 7 days and then subjec- ted to 30 rain of ischemia followed by 180 rain of reperfusion. Electrocardiogram （ECG） and heart rate were moni- tored and recorded continuously. At the end of reperfusion, blood samples were collected to determine the serum levels of creatine kinase-MB （CK-MB） and lactate dehydrogenase （LDH）. Hearts were harvested to assess heart- body rate, infarct size and histopathological changes as well. Maximum and minimum effective points were deter- mined by measuring indicators associate with myocardial injury at different time-points of reperfusion （Smin, 15min, 30min, 45rain, 60min, 120min, 180min）. The potential therapeutic mechanism of SM and SM ＋ DOO were carried out by detecting superoxide dismutase （SOD）, malondialdehyde （MDA）, tumor necrosis factor-alpha （TNF-alpha） and interleukin 6 （IL-6）. Results The results showed SM and DO can ameliorate cardiac function respectively, and this cardioprotective effect was further strengthened by their combinations. Among all the combi- nations, SM ＋ DOO showed predominant potential to improve ECG and heart rate, reduce heart-body rate （28.5% ＋ 1.4% , P 〈 0.01 vs model） and myocardial infarct size （ 20.96% ＋ 1.61% , P 〈 0.01 vs model, P 〈 0.05 vs SM） , attenuate histopathological damage, decrease the levels of CK-MB and LDH （P 〈 0.01 vs model, P 〈 0.05 vs SM）. The maximum effective points of SM and SM ＋ DOO were 15min and 30rain respectively, and the minimum effective points of them were 180rain. In reducing serum level of MDA, TNF-alpha, IL-6 and increasing SOD activ- ity, SM ＋ DOO was similar to SM. Conclusion The results of this study indicated that SM ＋ DOO have combined effects that are highly effective than single pretreatment against myocardial ischemie reperfusion injury in rats. The possible mechanism of SM and DO were likely through its anti-oxidant and anti-inflammatory properties, and thus may be an effective and promising medicine for both prophylaxis and treatment of ischemic heart disease.展开更多
OBJECTIVE To investigates the effects of imperatorin on the oxidative stress in the cerebral cortex and hippocampus after focal cerebral ischemia/reperfusion injury.METHODS Transient focal cerebral ischemia/reperfusio...OBJECTIVE To investigates the effects of imperatorin on the oxidative stress in the cerebral cortex and hippocampus after focal cerebral ischemia/reperfusion injury.METHODS Transient focal cerebral ischemia/reperfusion model in male Sprague-Dawley rats was induced by 2 h middle cerebral artery occlusion followed by 24 h reperfusion.Imperatorin(1.25 and 2.5 mg·kg-1)or vehicle were administered intraperitoneally at 1,5 and 9 h after the onset of ischemia.At 24 h after reperfusion,the biomarkers of oxidative stress such as the levels of reactive oxygen species(ROS),lipid peroxidation products malondialdehyde(MDA),nitric oxide(NO)and total antioxidant capacity(T-AOC),the activities of inducible nitric oxide synthase(iN OS),superoxide dismutase(SOD)and catalase(CAT)in the cerebral cortex and hippocampus were observed.We also assessed the nuclear factor erythroid 2-related factor 2(Nrf2),heme oxygenase-1(HO-1),and the NAD(P)H-quinone oxidoreductase 1(NQO-1)protein expression by Western blot.RESULTS As compared to vehicle-treated animals,imperatorin treatment significantly reduced the ROS,MDA,NO levels and i NOS activity,increased T-AOC and the activities of SOD and CAT.Furthermore,imperatorin treatment also significantly induced the nuclear translocation of Nrf2,enhanced the protein expression of HO-1 and NQO-1 in the cerebral cortex and hippocampus.CONCLUSION Our findings indicate that imperatorin can protect the brain against the excessive oxidative stress induced by cerebral ischemia/reperfusion through activation of Nrf2 signaling pathway.展开更多
The YiQiFuMai powder injection （ YQFM）, a Traditional Chinese Medicine （TCM） prescription re-de- veloped based on the well-known TCM formula Sheng-maisan, showed a wide range of pharmacological activities in ca...The YiQiFuMai powder injection （ YQFM）, a Traditional Chinese Medicine （TCM） prescription re-de- veloped based on the well-known TCM formula Sheng-maisan, showed a wide range of pharmacological activities in cardiovascular diseases in clinic. However, its role in protection against myocardial ischemia/reperfusion （MI/R） injury has not been elucidated. The present study not only evaluated the eardioprotective effect of YQFM from MI/ R injury but also investigated the potential molecular mechanisms in vivo and in vitro. The mouse model of MI/R injury was induced by a transient vessel occlusion for 30 rain and reperfusion for 24 h. The myocardium infarct size, production of lactate dehydrogenase （LDH）, creatine kinase （CK）, TUNEL staining and easpase-3 activity were measured. AMPKeα and phospho-AMPKα was analyzed by Western blot. We further verified the protective effect and potential molecular mechanisms of YQFM in an in vitro model of simulated ischemia and reperfusion （ SI/ R） in H9c2 cardiomyocytes. Cell viability was determined, and cell apoptosis were measured by Hoechst 33342 staining and Flow cytometry. Mitochondrial membrane potential （△ψFm） was measured, and ATP content was quantified by biolumineseent assay. Expression of apoptosis-related proteins including Caspase-3, Bcl-2, Bax, AMPKα and phospho-AMPKα was analyzed by Western blot. AMPKoL siRNA transfection was also applied to the mechanism elucidation. YQFM significantly reduced myocardium infarct size and the production of LDH, CK in se- rum, and also produced a significant decrease of apoptotic index which was confirmed by TUNEL staining and the changes of caspase-3 activity. In addition, pretreatment with YQFM markedly improved cell viability and decreased LDH release. Moreover, YQFM inhibited H9c2 apoptosis, blocked the expression of easpase-3 and modulated Bcl- 2 and Bax proteins, leading to an increased mitochondrial membrane potential and cellular ATP content. Mechanis- tically, YQFM activated AMPK signaling pathways while pretreatment with AMPK inhibitor compound C and appli- cation of transfection with AMPKα siRNA attenuated the anti-apoptotie effect of YQFM. Our results indicated that YQFM could provide significant cardioproteetion against MI/R injury, and potential mechanisms might to suppres- sion of cardiomyocytes apoptosis at least in part through activating the AMPK signaling pathways.展开更多
Myocardial infarction resulting from coronary atherosclerosis is the leading cause of death in modern soci- ety. Reperfusion is an essential treatment to salvage ischemia myocardium from necrosis, while it also leads ...Myocardial infarction resulting from coronary atherosclerosis is the leading cause of death in modern soci- ety. Reperfusion is an essential treatment to salvage ischemia myocardium from necrosis, while it also leads to addi- tional damage. Therefore, exploring effective medicines to protect the heart from post-ischemic injury is one of the major objectives of cardiovascular research. Berbamine is a nature compound of bisbenzylisochinoline alkaloids from Barberry. We found that it displays positive inotropic and lusitropic effects at lower concentrations by increasing myofilament Ca2＋ sensitivity via a PKCe-dependent signaling pathway. Moreover, berbamine preconditioning con- fers cardioprotection against ischemia/reperfusion （I/R） injury by attenuating the Ca2＋ overloading and preventing the calpain activation through the activating of PI3K-Akt-GSK3β pathway and subsequently opening of the mitoKATP channel. Furthermore, we demonstrate that berbamine postconditioning conferred the cardioprotective effect against I/R injury by the regulation of autophagy. These findings reveal new roles and mechanisms of berbamine in the heart and cardioprotection against I/R injury.展开更多
OBJECTIVE To explore the effect of total flavonoids of Rhododendra simsii(TFR)on improving cerebral ischemia/reperfusion injury(CIRI)and its relationship with STIM/Orai-regulated operational Ca^(2+)influx(SOCE)pathway...OBJECTIVE To explore the effect of total flavonoids of Rhododendra simsii(TFR)on improving cerebral ischemia/reperfusion injury(CIRI)and its relationship with STIM/Orai-regulated operational Ca^(2+)influx(SOCE)pathway.METHODS Oxygen-glucose deprivation/reoxygenation(OGD/R)PC12 cells were used to simulate CIRI in vitro,and the intracellular Ca^(2+)concentration and apoptosis rate of PC12 cells were detected by laser confocal microscope and flow cytometry,respectively.The regulation of STIM/Orai on SOCE was analyzed by STIM/Orai gene silencing and STIM/O rai gene overexpression.The CIRI model was established by MCAO in SD rats.The activities of inflammatory cytokines IL^(-1),IL-6 and TNF-αin serum were detected by ELISA.The pathological changes of ischemic brain tissue and the infarction of rat brain tissue were detected by HE staining and TTC staining.The protein and mRNA expression levels of STIM1,STIM2,Orai1,caspase-3 and PKB in brain tissue were detected by Western blotting and RT-qPCR,respectively.RESULTS The results of in vitro experiment showed that the fluorescence intensity of Ca^(2+)and apoptosis rate in PC12 cells treated with TFR were significantly lower than those in OGD/R group,and this trend was enhanced by SOCE antagonist 2-APB.STIM1/STIM2/Orai1 gene silencing significantly reduced apoptosis and Ca^(2+)overload in OGD/R model,while TFR combined with overexpression of STIM1/STIM2/Orai1 aggravated apoptosis and Ca2+overload.In the in vivo experiment,TFR significantly reduced the brain histopathological damage,infarction of brain tissue,the contents of IL^(-1),IL-6 and TNF-αin the serum in MCAO rats and down-regulated the expression of STIM1,STIM2,Orai1 and caspase-3 protein and mRNA in the brain tissue,and up-regulated the expression of PKB.The above effects were enhanced by the addition of 2-APB.CONCLUSION The above results indicate that TFR may reduce the contents of inflammatory factors and apoptosis,decrease Ca2+overload and ameliorate brain injury by inhibiting SOCE pathway mediated by STIM and Orai,suggesting that it has a protective effect against subacute CIRI.展开更多
OBJECTIVE To predict the potential targets of hyperoside(Hyp)on improving ischemia/reperfusion injury by network pharmacology,and explore its possible mechanism combined with related literature.METHODS The action targ...OBJECTIVE To predict the potential targets of hyperoside(Hyp)on improving ischemia/reperfusion injury by network pharmacology,and explore its possible mechanism combined with related literature.METHODS The action targets of Hyp and ischemia/reperfusion injury were obtained by TCMSP,Swiss Target Prediction,Pharm Mapper,Similarity ensemble approach,Online Mendelian Inheritance in Man,DisGENT and database.The common targets of drugs and diseases were screened by Omishare and STRING database respectively,and the protein-protein interaction(PPI)network map was constructed.Then the interaction network between Hyp and disease targets was constructed by Cytoscape software and topological cross-linking analysis was carried out.Then the interaction network between Hyp and disease targets was constructed and cross-linked analysis was carried out by using Cytoscape software.The gene ontology(GO)of the core target was analyzed by David database,and then the related pathways of the core target were enriched by KEGG database.RESULTS A total of 54 GO enrichment processes were obtained by GO enrichment analysis of 44 common genes,including 38 biological processes(BP),15 cell composition(CC)processes,and 1 molecular functional(MF)process.43 items were obtained by signal pathway enrichment analysis in KEGG database.CONCLUSION It is suggested that the mechanism of Hyp may be related to PI3K-Akt,RAP1,RAS,VEGF and other signal transduction pathways.The above results laid a theoretical foundation for the study of the mechanism and clinical application of the treatment of ischemia/reperfusion injury.展开更多
The morbidity and mortality of cardiovascular diseases are very high,which has attracted more and more attention all over the world.Common treatment methods for clinical treatment of acute myocardial infarction includ...The morbidity and mortality of cardiovascular diseases are very high,which has attracted more and more attention all over the world.Common treatment methods for clinical treatment of acute myocardial infarction include direct percutaneous coronary intervention and coronary artery bypass grafting,which can quickly restore blocked coronary blood flow and reduce the infarct size.However,the inevitable ischemia/reperfusion injury will occur during the recovery of coronary blood flow,its pathological mechanism is complicated,and the Western medicine countermeasures are very limited.Among the current drugs for the treatment of cardiovascular diseases,traditional Chinese medicine has become a research hotspot due to its multiple targets,safety,and low side effects.Ginger is the fresh rhizome of Zingiber officinale Rosc.,a perennial herbaceous plant in the ginger family.It is a dual-purpose resource of medicine and food.Ginger has the functions of relieving the appearance and dispelling cold,warming up and relieving vomiting,resolving phlegm and relieving cough,and relieving fish and crab poison.The chemical components of ginger mainly include volatile oil,gingerol,diphenylheptane,etc..Among them,6-gingerol,as the main active component of gingerols,has obvious pharmacological effects in myocardial protection,anti-oxidation,anti-inflammatory,etc..Studies have shown that 6-gingerol protects myocardium mainly through anti-oxidative stress,anti-inflammatory,inhibiting cell apoptosis,and preventing calcium influx.①Anti-oxidative stress:oxidative stress is a state where oxidation and anti-oxidation in the body are out of balance,and it is also an important factor leading to myocardial damage.Many studies have confirmed that 6-gingerol has an antioxidant effect,and it is considered a natural antioxidant.6-gingerol can significantly reduce the degree of oxidative stress and the level of reactive oxygen species caused by cardiomyocyte damage,and has a significant cardioprotective effect.②Anti-inflammatory:inflammation can cause substantial cell damage and organ dysfunction,which is another important cause of myocardial damage.6-gingerol can reduce the levels of inflammatory factors such as interleukin-6,interleukin-1β,and tumor necrosis factor-αin cardiomyocytes,and at the same time inhibit the TLR4/NF-κB signaling pathway,an important regulatory pathway of inflammation,showing that it may improve myocardial damage through anti-inflammatory effects.③Inhibition of apoptosis:apoptosis is a complex and orderly process in the autonomous biochemical process of cells,and one of the main mechanisms of myocardial injury.This process can be roughly divided into three pathways:mitochondria,endoplasmic reticulum,and death receptors.Among them,the mitochondrial pathway plays an important role,and Bcl-2 and Bax located upstream of this pathway can regulate the entire process of cell apoptosis by regulating the permeability of the mitochondrial membrane.Studies have found that the preventive application of 6-gingerol can reduce cell damage,reduce the number of apoptotic cells,reduce the activity of Bax and caspase-3,and increase the expression of Bcl-2.Therefore,6-gingerol pretreatment can reduce the damage of cardiomyocytes,and its mechanism may be related to the inhibition of apoptosis.④Prevent calcium influx:calcium overload is involved in the pathogenesis of myocardial ischemic injury,which may be related to excessive contracture,arrhythmia,and mitochondrial Ca2+accumulation that impairs myocardial function.6-gingerol inhibits the increase of intracellular Ca2+concentration by inhibiting L-type calcium current,thereby reducing extracellular Ca2+influx,thereby avoiding calcium overload and playing a cardioprotective effect.In summary,6-gingerol can effectively treat and improve myocardial ischemia/reperfusion injury,and it has great development potential in the fields of medicine and health products.展开更多
OBJECTIVE In this study we explored the role of Epac1-Rap1 pathway in the acute myocardial ischemia/reperfusion injury(MIRI) in vitro and in vivo.METHODS An acute myocardial ischemia/reperfusion injury model was estab...OBJECTIVE In this study we explored the role of Epac1-Rap1 pathway in the acute myocardial ischemia/reperfusion injury(MIRI) in vitro and in vivo.METHODS An acute myocardial ischemia/reperfusion injury model was established by the ligation of left anterior descending coronary.Myocardial architecture,fibers and apoptosis was evaluated by the Masson trichrome staining,Sirius red staining and TUNEL assay.H9c2 cells were subjected to hypoxia for 5 h followed by 1-h reoxygen.ation in vitro.Cell viability was measured by MTT assay and cellular injury was evaluated by measuring the release of lactate dehydrogenase(LDH).Western blot,real-time PCR and immunofluorescence were used to detect the expressions of Epac1 and relative downstream molecules.RESULTS Myocardial IR-induced cardiac apoptosis and accumulation of Epac1 and Rap1 in rat IR injury model.Direct Epac activation by 8-CPT(8-(4-chlorophenylthio)-2′-O-methyl-cAMP) exacerbated cardiomyocyte death and dysfunction following hypoxia-reoxygenation(H/R),selective activation of Epac in response to H/R was evident which enriched for cytosolic/membrane proteins and mRNA.Harmacological inhibitor of Epac(ESI-09) significantly ameliorated myocardial injury with the decline of Epac expression.Epac inhibitor and agonist studies also implicated the effect of Rap1,which is downstream of Epac in this pathway.The expression of Rap1 elevated when activated by Epac agonist and was blocked by Epac inhibitor.The same result was true for myocyte CaMK-II and intracellular calcium ions activation.Moreover,ESI-09 also increased ERK1/2 phosphorylation.CONCLUSION Our study reveal that Epac1/Rap1 signaling pathway is involved in the pathogenesis of myocardial I/R injury in rats,which provides evidence on the development of therapeutic strategies target this pathway for myocardial I/R injury.展开更多
OBJECTIVE To explore the effects and mechanism of icariside Ⅱ(ICS Ⅱ),a pharmacologically active compound derived from herbal Epimedii with previous study-proved phosphodiesterase 5(PDE5) inhibitors,was investigated ...OBJECTIVE To explore the effects and mechanism of icariside Ⅱ(ICS Ⅱ),a pharmacologically active compound derived from herbal Epimedii with previous study-proved phosphodiesterase 5(PDE5) inhibitors,was investigated in vivo using a middle cerebral artery occlusion/reperfusion(MCAO/R) model in rats and in vitro using an oxygen-glucose deprivation/reperfusion(OGD/R) model in primary hippocampal neurons.METHODS Laser Doppler flowmeter was introduced to examine the cerebral blood flow of MCAO/R rats.The neurological deficits scores,brain water content and infarction volume were assessed after MCAO/R.OGD/R-induced primary hippocampal neuronal injury and apoptosis were examined by MTT,lactate dehydrogenase(LDH) release,TUNEL staining and flow cytometry,respectively.Expressions of PDE5 A and memory-related signaling pathways were measured using Western blotting analysis.The direct interaction between ICS Ⅱand PDE5 was further evaluated by molecular docking.RESULTS ICS Ⅱ significantly decreased the infraction volume in MCAO/R rats.Furthermore,ICS Ⅱ significantly abrogated OGD/R-induced hippocampal neuronal death.Moreover,ICSⅡ not only effectively restored the 3′ 5′-cyclic guanosine monophosphate(cGMP) level and protein kinase G(PKG) activity both in vivo and in vitro,but also increased brain-derived neurotrophic factor(BDNF),tyrosine protein kinase B(TrkB) and cAMP response element-binding protein(CREB) expressions,thereby inhibited hippocampal neuronal apoptosis.Mechanistically,the beneficial effects of ICS Ⅱ was attributed to its activation of the PKG/TrkB/BDNF via increasing BDNF expression,evidenced by that the inhibition effects of ICSⅡ was abrogated by Rp-8-BrcGMPS,a PKG inhibitor,or ANA-12,a TrkB inhibitor.ICSⅡ also decreased both protein level and activity of PDE5.Notably,ICSⅡ might effectively bind and inhibite PDE5 as demonstrated by relatively high binding score.CONCLUSION ICSⅡ significantly protect against cerebral ischemia/reperfusion injury in rats and rescues OGD/Rinduced hippocampal neuronal injury,and the underling mechanisms are,at least partly,due to inhibition of PDE5 and activation of BDNF/TrkB/CREB signaling pathway.Hence ICS Ⅱ may be an effective agent for combating cerebral ischemia/reperfusion injury.展开更多
Aim Reduction of Sheng-Nao-Kang decoction （RSNK）, is a modified traditional Chinese medicinal formula of Sheng-Nao-Kang pill preparation, which is protective in rats against focal cerebral ischemia/reperfusion （I/R...Aim Reduction of Sheng-Nao-Kang decoction （RSNK）, is a modified traditional Chinese medicinal formula of Sheng-Nao-Kang pill preparation, which is protective in rats against focal cerebral ischemia/reperfusion （I/R） injury. In the current study, we investigate the protective effect of RSNK against apoptosis and oxidative damage induced by cerebral I/R and explore the underlying mechanisms. Cerebral I/R injury was induced by in- traluminal middle cerebral artery occlusion （MCAO） for 2 h followed by reperfusion for 24 h in adult male Sprague- Dawley rats. Rats were randomized into seven groups （n- 8）： Sham group, I/R group, RSNK-treated groups （ 0.7 g · kg ^- 1, 1 . 4 g · kg ^- 1 and 2. 8 g · kg^ - 1 ） , nimodipine （NMP） -treated group and Whitmania pigra Whitman （WW）-treated group. Neurological deficit scores, cerebral humidity content and cerebral infarction volume were measured after the 24 h reperfusion. Malondialdehyde （ MDA）, superoxide dismutase （ SOD）, catalase （ CAT）, inducible nitric oxide synthase （iNOS） and total nitric oxide synthase （TNOS） in serum were measured by assay kits for biochemical analysis. Histological structures of the cortex of the ipsilateral ischemic cerebral hemisphere in rats were observed by Nissl staining. The caspase-3 protein content in the hippocampus and cortex was detected by immunohistochemistry. Additionally, Bax and Bcl-2 protein expressions in the injured brain were evaluated by Western blot. RSNK administration not only markedly improved neurological deficit scores, but also reduced cere- bral humidity content and cerebral infarction volume, lowered MDA content, up-regulated SOD and CAT levels, down-regulated iNOS and TNOS levels, restrained the expression of caspase-3 positive protein and alleviated the Bax and Bcl-2 protein expressions.展开更多
OBJCETIVE Epidemiologic studies have demonstrated that consumption of moderate amounts of red wine is associated with significant reductions in incidences of cardiovascular and cerebrovascular diseases,which may be re...OBJCETIVE Epidemiologic studies have demonstrated that consumption of moderate amounts of red wine is associated with significant reductions in incidences of cardiovascular and cerebrovascular diseases,which may be related to alcohol in red wine.Our previous study demonstrated that ethanol ingestion 24 h prior to induction of cerebral ischemic/reperfusion(I/R)reduced delayed neuronal death(DND).Our most recent results supported a role for big Ca2+-sensitive K+channel(BKCa channel)activation in the neuroprotective effects of ethanol preconditioning(Et OH-PC)in global cerebral I/R.Therefore,we hypothesis that moderate Et OH-PC activates BKCa channel to protect brain damage induced by focal cerebral I/R.This project will utilize focal cerebral I/R animal model to explore the function of BKCa channel in Et OH-PC protection in vivo levels by means of pharmacological intervention such as BKCa channel opene(rNS11021,NS)and blocke(rpaxilline,PX).The results will provide theoretical evidence for neuroprotective effect of moderate alcohol preconditioning against ischemic stroke,and the conclusion will also bring to a concept that extrinsic moderate ethanol preconditioning may activate intrinsic protective mechanism in the brain.METHODS The SD rat were randomly divided into the following six groups(n=10):sham,I/R,Et OH-PC+I/R,NS11021-PC+I/R,paxilline+Et OH-PC+I/R,Paxilline+NS11021-PC+I/R.Both Et OH-PC and NS11021-PC(0.1mg·kg-1;ip)were induced 24 h before I/R.The volume of 95%ethanol to be instilled(inμL)was calculated as follows:〔body weight(g)×0.6〕+0.3.This volume of ethanol was mixed in 0.3 m L of sterile distilled water just before administration to the animals by gavage.The Paxilline(2.5 mg·kg-1;ip)was administered 10min beforeEt OH-PC and NS11021-PC.The right middle cerebral artery occlusion(MCAO)was produced by inversion of a 4-0-nylon filament.The filament was withdrawn 2 h after onset of MCAO and then reperfused.Neurological deficits and infarct volume were measured 24 h after I/R.Another 36 rats were randomly divided into 6 groups as above,6 in each group.DWI were performed 2h after ischemic and T2WI MRI were performed 24 h after I/R to observe the infarct volume of brain and the penumbra volume of brain in each group.Then rats were killed and detected the apoptotic cell death and degeneration of neurons.RESULTS Compared to I/R group,the neurological score(P<0.01),the infarct volume of brain(P<0.01),the infarct volume of ischemic penumbra(P<0.01),the percentage of apoptotic cell death(P<0.01)and the percentage of degenerative neurons(P<0.01)were significantly decreased after ethanol preconditioning,while these changes were reversed by paxilline(P<0.05);compared to I/R group,the neurological score(P<0.01),the infarct volume of brain(P<0.01),the infarct volume of ischemic penumbra(P<0.01),the percentage of apoptotic cell death(P<0.01)and the percentage of degenerative neurons(P<0.01)were significantly decreased after NS11021 preconditioning,while these changes were reversed by paxilline(P<0.05).CONCLUSION Our results show that moderate alcohol preconditioning activates BKCa channels to protect brain damage induced by focal cerebral I/R.展开更多
OBJECTIVE Ginsenoside Rg1(Rg1),a purified compound from Panax ginseng,has been well documented to be effective against ischemia/reperfusion(I/R) neurotoxicity.However,the underlying mechanism is stil obscure.METHODS T...OBJECTIVE Ginsenoside Rg1(Rg1),a purified compound from Panax ginseng,has been well documented to be effective against ischemia/reperfusion(I/R) neurotoxicity.However,the underlying mechanism is stil obscure.METHODS The anti-I/R effect of Rg1 were investigated in vitro and in vivo,and the dynamics of nuclear accumulation and the transcriptional activity of NF-E2-related factor 2(Nrf2) determined by Western blotting and Dual Luciferase Reporter Assay,respectively.Nrf2 siRNA was employed to investigate Nrf2′s role in the protective effect of Rg1 against I/R.Furthermore,the role of miR-144,which could regulate post-translational Nrf2 levels,was investigated in the anti-I/R effect of Rg1 by injection of AAV-hypoxia-inducible factor miR-144-shRNA in the predicted ischemic penumbra.RESULTS It was found that the anti-I/R effect of Rg1 was related to its anti-oxidative capacity,which is mainly regulated by the Nrf2/antioxidant response element(ARE) pathway.Further study suggested that Rg1 contributes to the enhancement of the Nrf2/ARE pathway,as manifested by increasing the dynamic peak content of Nrf2,which prolonged the maintenance stage,and promoting the expression of ARE-target genes after oxygen glucose deprivation/reperfusion(OGD/R) in PC12 cells.Nrf2-siRNA application significantly reduced these changes.Furthermore,the enhancement of the Nrf2/ARE pathway by Rg1 was independent of disassociation from Keap1;rather it was a result of posttranslational regulations.It was found that Rg1 significantly reduced the expression of miR-144,which down-regulates Nrf2 production by targeting its 3′-untranslated region,after OGD/R.Knockdown of Nrf2 showed no effect on the expression of miR-144,indicating that miR-144 is an upstream regulator of Nrf2.Moreover,direct binding between Nrf2 and miR-144 in the PC12 cells was identified.Application of anti-miR-144 significantly reduced Rg1′s anti-OGD/R capacity.Final y,the role of miR-144 in Rg1′ s anti-I/R effect was tested by inhibiting miR-144 in the predicted ischemic penumbra when hypoxia-inducible-factor was activated.The results showed that loss of miR-144 abolished the anti-I/R effect of Rg1,which included reduced infarct volume,improved neurological scores,attenuated oxidative impairment,as well as activation of the Nrf2/ARE pathway.CONCLUSION Oxidative stress after I/R is alleviated by Rg1 through inhibition of miR-144 activity and subsequent promotion of the Nrf2/ARE pathway at the post-translational level.展开更多
Aim Shengmai injection （SMI） , a Chinese patent medicine deprived from an ancient Chinese herbal compound Shengmai san, which is used extensively for the treatment of cardiovascular and cerebrovascular disease in cl...Aim Shengmai injection （SMI） , a Chinese patent medicine deprived from an ancient Chinese herbal compound Shengmai san, which is used extensively for the treatment of cardiovascular and cerebrovascular disease in clinic. To determine the neuroprotective effect of SMI, the effect and the relevant mechanism of SMI had been inves- tigated on cerebral ischemia-reperfusion injury in mice. Methods Right middle cerebral artery was occluded by in- serting a thread through intemal carotid artery for 1 h, and then reperfusion for 24 h in mice. Neuroprotective effect was testified using transmission electron microscopic examination, evaluation of infarct volume and neurological defi- cits. Related mechanism was evaluated by western blotting. The SMI was injected intraperitoneally after ischemia for 1 h at doses of 1.42, 2. 84 and 5.68 g · kg^-1. The control group received saline as vehicle of SMI. Results SMI （ 1.42, 2. 84 and 5. 68 g · kg^-1） could significantly reduced the infarct volume, SMI （5.68 g · kg^-1） could signifi- cantly improved the neurological deficits, as well as the neuron＇s morphology change. SMI （5.68 g · kg^-1） could significantly inhibited the autophagy-related proteins： Beclinl and LC3. SMI （5. 68 g · kg^-1） remarkably inhibited the phosphorylation of adenosine monophosphate activated protein kinase （AMPK）, and down-regulated the phospho- rylation of mammalian target of rapamycin （roTOR） and Jun N-terminal kinase （JNK） after 24 h reperfusion. Con-clusion The results indicated that SMI elicits potent protection against cerebral ischemia/reperfusion injury, which may partly be due to the inhibition in autophagy and related signal pathways.展开更多
We recently reported that nucleotide-binding oligomerization domain （NOD） 2, an important cytoplasmic pattern recognition receptor, is involved in cerebral ischemia-reperfusion （I/R） injury. β-arrestins, in addit...We recently reported that nucleotide-binding oligomerization domain （NOD） 2, an important cytoplasmic pattern recognition receptor, is involved in cerebral ischemia-reperfusion （I/R） injury. β-arrestins, in addition to regulate desensitization of G protein-coupled receptors （GPCRs） , have emerged as potential mediators of innate im- mune activation. However, the role and mechanism of β-arrestin2 in NOD2-triggered signaling in the cerebral I/R remain to be established. Methods BV2 cells were transfected with either β-arrestin2-shRNA plasmid or β-arres- tin2 full-length plasmid and control vector. Middle cerebral artery occlusion （MCAO） was induced in male wild- type mice and in wild type （WT） and β-arrestin2 deficient mice. Results muramyl dipeptide （MDP）, an extrin- sic ligand of NOD2, significantly increased the expression of TRAF6 and COX-2 and enhanced the activation of NF- KB in the microglia time-dependently. MDP stimulation also promoted the expression and activation of MMP-9 time- dependently, but did not affect MMP-2 obviously. Additionally, β-arrestin 2 interacted with TRAF6 after MDP stim- ulation rapidly. Overexpression of β-arrestin2 inhibited NF-KB and MMP-9 activation and COX-2 upregulation in- duced by MDP, while silence of β-arrestin2 enhanced NOD2-triggered inflammatory signaling. Finally, Deletion of β-arrestin 2 markedly aggravated brain infarction, neurological deficit and inflammation induced by MDP in mice subjected to MCAO. Conclusion The results provide the first evidence that β-arrestin 2 is an essential negatively regulator of NOD2 triggered inflammatory signaling in the cerebral I/R injury.展开更多
OBJECTIVE The total steroid saponins(TSSN)isolated from Dioscorea zingiberensis C.H.Wright(D.zingiberensis)has shown a variety of beneficial bioactivities.However,there are no reports about the neuroprotective effects...OBJECTIVE The total steroid saponins(TSSN)isolated from Dioscorea zingiberensis C.H.Wright(D.zingiberensis)has shown a variety of beneficial bioactivities.However,there are no reports about the neuroprotective effects of the TSSN until now.Therefore,we explored the neuroprotective effects of TSSN on rats against transient focal cerebral ischemia-reperfusion(I/R)and the underlying mechanisms.METHODS The healthy adult Sprague-Dawley rats were randomly assigned into six groups.After pre-treatment with the TSSN intragastrically for six days,the rats were subjected to the ischemia injury by the surgery of middle cerebral artery occlusion(MCAO)for 90 min.Some indexes were evaluated and detected.RESULTS As compared to the I/R group,TSSN group of rats,especially given the 30 mg·kg^-1 of TSSN,not only marked reduction in the neurological deficit scores,cerebral infarct volume,and brain edema,but also an increase in neuron survival(Nissl bodies)in the hippocampal cornuammons 1(CA1)and cortex hemisphere of the ipsilateral ischemia.At the same time,the inflammatory cytokines in serum induced by MCAO were significantly alleviated by the TSSN pre-administration.What′s more,the increase of caspase-3 was evidently reduced in the CA1 and cortex of the hemisphere injured brain.Finally,the down-regulating anti-apoptotic Bcl-2 and up-regulating pro-apoptotic Bax proteins were obviously suppressed.CONCLUSION TSSN plays a potential neuroprotective role against a severe injury induced by transient focal cerebral ischemic reperfusion in a rat experimental model,and this role may be mediated by its antiinflammatory and anti-apoptotic actions.展开更多
OBJECTIVE To investigate regulatory effects of hyperoside(Hyp)on IP3/PKC/TRPV4 pathway in rat cerebral basilar artery(CBA)subjected to global cerebral ischemia-reperfusion(I/R).METHODS The model of global cerebral I/R...OBJECTIVE To investigate regulatory effects of hyperoside(Hyp)on IP3/PKC/TRPV4 pathway in rat cerebral basilar artery(CBA)subjected to global cerebral ischemia-reperfusion(I/R).METHODS The model of global cerebral I/R in rats was established by four-vessel occlusions methods.The treated rats were administrated with Hyp(50 mg·kg^-1)group,Hyp(50 mg·kg^-1)+HC-067047(10 mg·kg^-1),Hyp(50 mg·kg^-1)+2APB(2 mg·kg^-1),Hyp(50 mg·kg^-1)+BisI(2.5 mg·kg^-1),Hyp(50 mg·kg^-1)+2APB(2 mg·kg^-1)+BisI(2.5 mg·kg^-1).Hematoxylin-eosin(HE)and Nissl staining were performed and the contents of methane dicarboxylic aldehyde(MDA),neuron-specific enolase(NSE),S100β and the activity of lactic dehydrogenase(LDH)in serum were measured by enzyme-linked immunosorbnent assay(ELISA).The specific blocker N-nitro-L-arginine-methyl-ester(L-NAME)and indomethacin(Indo)were used to delete the prostacyclin(PGI2)and nitric oxide(NO)dependent relaxation.The protein expression level of TRPV4 was detected by Western blotting.Ca2+intensity in vascular smooth muscle cells was measured by confocal laser scanning microscope and flow cytometry was performed to observe the apoptosis of CBA endothelial cells after in vivo administration.RESULTS Hyp induced a dose-dependent relaxation of CBA in IR rats via a PGI2 and NO independent manner,as evidenced by alleviated patho⁃logical changes and up-regulated expression of TRPV4 protein in the endothelial cells from cerebral vessels.Hyp signifi⁃cantly reduced the contents of MDA,NSE,S100βand the activity of LDH in serum and decreased the fluorescence intensity of Ca2+in cerebral vascular smooth muscle cells by in vivo administration.The apoptotic rate of endothelial cells in Hyp treated group was significantly less than that in IR group.CONCLUSION Hyp does in fact ameliorate I/R injury by regulatingIP3/PKC/TRPV4 pathway.展开更多
OBJECTIVE Learning and memory impairment is one of the common sequelae of stroke patients,which is called"post-stroke dementia"and seriously affects the quality of life of the patients.For post-stroke dement...OBJECTIVE Learning and memory impairment is one of the common sequelae of stroke patients,which is called"post-stroke dementia"and seriously affects the quality of life of the patients.For post-stroke dementia,there is still no effective clinical treatment.In the present study,we aim to investigate the effect of the active ingredient of Ferula sinkiangensis,AW09,on global cerebral ischemia-reperfusion mice.METHODS The bilateral common carotid artery occlusion(BCCAO)reperfusion model was used to investigate the protective effect of AW09 on cognitive dysfunction in mice with global cerebral ischemia reperfusion.Y-maze and Morris water maze were used to test the learning and memory ability of mice.RESULTS Y-maze test showed that AW09 treatment significantly increased the spontaneous alternation rate of BCCAO model animals and had no significant effect on the total number of arm entries.The results of Morris water maze showed that AW09 significantly reduced the escape latency of BCCAO mice during the training period.During the probe test phase,AW09 significantly increased the swimming time in target quadrant,distance in target quadrant and number of platform crossings and decreased the swimming time in the quadrant opposite the target quadrant of BCCAO mice.CONCLUSION AW09,the active ingredient of Ferula sinkiangensis,can improve working memory impairment and spatial memory impairment in animals with global cerebral ischemia-reperfusion,suggesting that AW09 has poten⁃tial therapeutic value for cognitive dysfunction caused by global cerebral ischemia.展开更多
Renal ischemia reperfusion injury increases renal generation of angiotensin II （Ang Ⅱ） which could wors- en renal vasocontraction. Thus, we investigated the hypothesis that renal ischemia reperfusion injury alters ...Renal ischemia reperfusion injury increases renal generation of angiotensin II （Ang Ⅱ） which could wors- en renal vasocontraction. Thus, we investigated the hypothesis that renal ischemia reperfusion injury alters renal af- ferent arteriolar responses to Ang II via production of hydrogen peroxide （ H202 ）, or superoxide （ O2 ） or via al- tered angiotensin type 1 receptor （AT1R） expression. Afferent arterioles of mouse kidneys 24h after renal ischemia repeffusion or sham procedures were isolated and perfused. Responses to Ang II or norepinephrine （NE） were as- sessed by measurement of arteriolar luminal diameter. The mRNA expressions of AT1 receptor （ AT1 R） and AT2 re- ceptor （ATzR） were evaluated by quantificational real-time polymerase chain reaction. Compared to sham group, afferent arterioles from mouse kidneys after renal ischemia reperfusion had impaired contractions to Ang II （ -4.63 ± 3.06） % versus （ - 29.95 ± 1.31 ） % at 10 -9 tool · ^-1, p 〈 0.05 , （ - 27.07 ± 1 50） % versus （ - 41 74 ± 0.60） % at 10^-7 tool · L^-1, P 〈 0.05 ） that were normalized by incubation with PEG-catalase , but unaffected by PEG-SOD. However, the NE responses of afferent arterioles after renal ischemia reperfusion were unchanged. Com- pared to the sham group, renal ischemia reperfusion significantly increased the renal cortical H202 （0. 123 ± -1 0. 006） versus （0. 087 ± 0. 003） mmol·mg protein, P 〈 0.01 ）, reduced catalase activity [ （ 14.81 ± 3.22） ver- sus （28.49 ± 1.62） units · mg^-1 protein, P 〈 0.01 ] and downregulated mRNA for AT1R （0.27 ± 0.02 versus 0.95 ± 0.02, P 〈 0.01 ）. We conclude that afferent arteriolar responses to Ang II are impaired selectively in mice after renal ischemia reperfusion by accumulation of H202 and reduced expression of AT1R.展开更多
OBJECTIVE TO investigate the neural protection of dehydrocostus lactone(DHL)against neuronal injury induced by oxygen and glucose deprivation/reperfusion(OGD/R)in differentiated PC12 cells.METHODS We used a cellular m...OBJECTIVE TO investigate the neural protection of dehydrocostus lactone(DHL)against neuronal injury induced by oxygen and glucose deprivation/reperfusion(OGD/R)in differentiated PC12 cells.METHODS We used a cellular model of 2 h of OGD and 24 h of reperfusion to mimic cerebral ischemia-reperfusion injury.Cell viability was used to reflect the degree of OGD/R-induced injury.Cells were treated with DHL during the reperfusion phase.Cell Counting Kit(CCK-8)and LDH assays were performed to determine the optimal dose of DHL and cell viability.Flow cytometry analysis and Monodansylcadaverine(MDC)staining were then conducted to detect apoptosis rate and autophagosome formation after OGD/R in PC12 cells.Immunofluorescence and Western blotting analyses were used to detect the expres⁃sion of proteins associated with autophagy and apoptosis.RESULTS OGD/R significantly decreased cell viability and increased apoptosis rate.The expression levels of autophagy-related proteins,namely,LC3 and Beclin-1,and apoptosisrelated proteins,namely,Bax and caspase-3 increased,but that of the anti-apoptosis Bcl-2 protein decreased.However,DHL attenuated OGD/R-induced neuronal injury through inhibition of apoptosis and autophagy properties by modulating au⁃tophagy-associated proteins(LC3 and Beclin-1)and apoptosis-modulating proteins(caspase-3 and Bcl-2/Bax).CONCLU⁃SION Our data provide an evidence for the neuroprotective effect of DHL against ischemic neuronal injury.Hence,DHL could be a promising candidate for treatment of ischemic stroke.展开更多
文摘Aim Salvia miltiorrhiza Bunge （SM） and lignum dalbergiae odoriferae （DO） are both traditional Chi- nese medicine that have cardioprotective effects. Here, we further examined the combined effects of SM and DO on rat myocardial ischemia/reperfusion injury. The possible mechanism of SM and DO also were elucidated. Methods DO was divided into aqueous extract of lignum dalbergiae odoriferae （DOW） and lignum dalbergiae odoriferae oil （DOO）. Sprague-Dawley rats were randomized to seven groups： sham group, model group, treatment groups inclu- ding SM （10 g · kg^-1）, DOW （5 g · kg^-1）, DOO （0.5 ml · kg^-1）, SM ＋ DOW （10 g · kg^-1 ＋ 5 g · kg^-1）, SM ＋ DOO （ 10 g · kg^-1 ＋ 0. 5 ml · kg^-1）. Rats were pretreated with homologous drug for 7 days and then subjec- ted to 30 rain of ischemia followed by 180 rain of reperfusion. Electrocardiogram （ECG） and heart rate were moni- tored and recorded continuously. At the end of reperfusion, blood samples were collected to determine the serum levels of creatine kinase-MB （CK-MB） and lactate dehydrogenase （LDH）. Hearts were harvested to assess heart- body rate, infarct size and histopathological changes as well. Maximum and minimum effective points were deter- mined by measuring indicators associate with myocardial injury at different time-points of reperfusion （Smin, 15min, 30min, 45rain, 60min, 120min, 180min）. The potential therapeutic mechanism of SM and SM ＋ DOO were carried out by detecting superoxide dismutase （SOD）, malondialdehyde （MDA）, tumor necrosis factor-alpha （TNF-alpha） and interleukin 6 （IL-6）. Results The results showed SM and DO can ameliorate cardiac function respectively, and this cardioprotective effect was further strengthened by their combinations. Among all the combi- nations, SM ＋ DOO showed predominant potential to improve ECG and heart rate, reduce heart-body rate （28.5% ＋ 1.4% , P 〈 0.01 vs model） and myocardial infarct size （ 20.96% ＋ 1.61% , P 〈 0.01 vs model, P 〈 0.05 vs SM） , attenuate histopathological damage, decrease the levels of CK-MB and LDH （P 〈 0.01 vs model, P 〈 0.05 vs SM）. The maximum effective points of SM and SM ＋ DOO were 15min and 30rain respectively, and the minimum effective points of them were 180rain. In reducing serum level of MDA, TNF-alpha, IL-6 and increasing SOD activ- ity, SM ＋ DOO was similar to SM. Conclusion The results of this study indicated that SM ＋ DOO have combined effects that are highly effective than single pretreatment against myocardial ischemie reperfusion injury in rats. The possible mechanism of SM and DO were likely through its anti-oxidant and anti-inflammatory properties, and thus may be an effective and promising medicine for both prophylaxis and treatment of ischemic heart disease.
基金supported by National Natural Science Foundation of China(81060269 and81360492)Natural Science Foundation of Jiangxi Province of China(20122BAB205036)
文摘OBJECTIVE To investigates the effects of imperatorin on the oxidative stress in the cerebral cortex and hippocampus after focal cerebral ischemia/reperfusion injury.METHODS Transient focal cerebral ischemia/reperfusion model in male Sprague-Dawley rats was induced by 2 h middle cerebral artery occlusion followed by 24 h reperfusion.Imperatorin(1.25 and 2.5 mg·kg-1)or vehicle were administered intraperitoneally at 1,5 and 9 h after the onset of ischemia.At 24 h after reperfusion,the biomarkers of oxidative stress such as the levels of reactive oxygen species(ROS),lipid peroxidation products malondialdehyde(MDA),nitric oxide(NO)and total antioxidant capacity(T-AOC),the activities of inducible nitric oxide synthase(iN OS),superoxide dismutase(SOD)and catalase(CAT)in the cerebral cortex and hippocampus were observed.We also assessed the nuclear factor erythroid 2-related factor 2(Nrf2),heme oxygenase-1(HO-1),and the NAD(P)H-quinone oxidoreductase 1(NQO-1)protein expression by Western blot.RESULTS As compared to vehicle-treated animals,imperatorin treatment significantly reduced the ROS,MDA,NO levels and i NOS activity,increased T-AOC and the activities of SOD and CAT.Furthermore,imperatorin treatment also significantly induced the nuclear translocation of Nrf2,enhanced the protein expression of HO-1 and NQO-1 in the cerebral cortex and hippocampus.CONCLUSION Our findings indicate that imperatorin can protect the brain against the excessive oxidative stress induced by cerebral ischemia/reperfusion through activation of Nrf2 signaling pathway.
文摘The YiQiFuMai powder injection （ YQFM）, a Traditional Chinese Medicine （TCM） prescription re-de- veloped based on the well-known TCM formula Sheng-maisan, showed a wide range of pharmacological activities in cardiovascular diseases in clinic. However, its role in protection against myocardial ischemia/reperfusion （MI/R） injury has not been elucidated. The present study not only evaluated the eardioprotective effect of YQFM from MI/ R injury but also investigated the potential molecular mechanisms in vivo and in vitro. The mouse model of MI/R injury was induced by a transient vessel occlusion for 30 rain and reperfusion for 24 h. The myocardium infarct size, production of lactate dehydrogenase （LDH）, creatine kinase （CK）, TUNEL staining and easpase-3 activity were measured. AMPKeα and phospho-AMPKα was analyzed by Western blot. We further verified the protective effect and potential molecular mechanisms of YQFM in an in vitro model of simulated ischemia and reperfusion （ SI/ R） in H9c2 cardiomyocytes. Cell viability was determined, and cell apoptosis were measured by Hoechst 33342 staining and Flow cytometry. Mitochondrial membrane potential （△ψFm） was measured, and ATP content was quantified by biolumineseent assay. Expression of apoptosis-related proteins including Caspase-3, Bcl-2, Bax, AMPKα and phospho-AMPKα was analyzed by Western blot. AMPKoL siRNA transfection was also applied to the mechanism elucidation. YQFM significantly reduced myocardium infarct size and the production of LDH, CK in se- rum, and also produced a significant decrease of apoptotic index which was confirmed by TUNEL staining and the changes of caspase-3 activity. In addition, pretreatment with YQFM markedly improved cell viability and decreased LDH release. Moreover, YQFM inhibited H9c2 apoptosis, blocked the expression of easpase-3 and modulated Bcl- 2 and Bax proteins, leading to an increased mitochondrial membrane potential and cellular ATP content. Mechanis- tically, YQFM activated AMPK signaling pathways while pretreatment with AMPK inhibitor compound C and appli- cation of transfection with AMPKα siRNA attenuated the anti-apoptotie effect of YQFM. Our results indicated that YQFM could provide significant cardioproteetion against MI/R injury, and potential mechanisms might to suppres- sion of cardiomyocytes apoptosis at least in part through activating the AMPK signaling pathways.
文摘Myocardial infarction resulting from coronary atherosclerosis is the leading cause of death in modern soci- ety. Reperfusion is an essential treatment to salvage ischemia myocardium from necrosis, while it also leads to addi- tional damage. Therefore, exploring effective medicines to protect the heart from post-ischemic injury is one of the major objectives of cardiovascular research. Berbamine is a nature compound of bisbenzylisochinoline alkaloids from Barberry. We found that it displays positive inotropic and lusitropic effects at lower concentrations by increasing myofilament Ca2＋ sensitivity via a PKCe-dependent signaling pathway. Moreover, berbamine preconditioning con- fers cardioprotection against ischemia/reperfusion （I/R） injury by attenuating the Ca2＋ overloading and preventing the calpain activation through the activating of PI3K-Akt-GSK3β pathway and subsequently opening of the mitoKATP channel. Furthermore, we demonstrate that berbamine postconditioning conferred the cardioprotective effect against I/R injury by the regulation of autophagy. These findings reveal new roles and mechanisms of berbamine in the heart and cardioprotection against I/R injury.
基金National Natural Science Foundation of China(81173596)and Major Project of Natural Science Foundation of the Department of Education of Anhui Province(KJ2019ZD32)。
文摘OBJECTIVE To explore the effect of total flavonoids of Rhododendra simsii(TFR)on improving cerebral ischemia/reperfusion injury(CIRI)and its relationship with STIM/Orai-regulated operational Ca^(2+)influx(SOCE)pathway.METHODS Oxygen-glucose deprivation/reoxygenation(OGD/R)PC12 cells were used to simulate CIRI in vitro,and the intracellular Ca^(2+)concentration and apoptosis rate of PC12 cells were detected by laser confocal microscope and flow cytometry,respectively.The regulation of STIM/Orai on SOCE was analyzed by STIM/Orai gene silencing and STIM/O rai gene overexpression.The CIRI model was established by MCAO in SD rats.The activities of inflammatory cytokines IL^(-1),IL-6 and TNF-αin serum were detected by ELISA.The pathological changes of ischemic brain tissue and the infarction of rat brain tissue were detected by HE staining and TTC staining.The protein and mRNA expression levels of STIM1,STIM2,Orai1,caspase-3 and PKB in brain tissue were detected by Western blotting and RT-qPCR,respectively.RESULTS The results of in vitro experiment showed that the fluorescence intensity of Ca^(2+)and apoptosis rate in PC12 cells treated with TFR were significantly lower than those in OGD/R group,and this trend was enhanced by SOCE antagonist 2-APB.STIM1/STIM2/Orai1 gene silencing significantly reduced apoptosis and Ca^(2+)overload in OGD/R model,while TFR combined with overexpression of STIM1/STIM2/Orai1 aggravated apoptosis and Ca2+overload.In the in vivo experiment,TFR significantly reduced the brain histopathological damage,infarction of brain tissue,the contents of IL^(-1),IL-6 and TNF-αin the serum in MCAO rats and down-regulated the expression of STIM1,STIM2,Orai1 and caspase-3 protein and mRNA in the brain tissue,and up-regulated the expression of PKB.The above effects were enhanced by the addition of 2-APB.CONCLUSION The above results indicate that TFR may reduce the contents of inflammatory factors and apoptosis,decrease Ca2+overload and ameliorate brain injury by inhibiting SOCE pathway mediated by STIM and Orai,suggesting that it has a protective effect against subacute CIRI.
基金National Natural Science Foundation of China(81170148)and Major Project of Natural Science Foundation of the Department of Education of Anhui Province(KJ2019ZD32)。
文摘OBJECTIVE To predict the potential targets of hyperoside(Hyp)on improving ischemia/reperfusion injury by network pharmacology,and explore its possible mechanism combined with related literature.METHODS The action targets of Hyp and ischemia/reperfusion injury were obtained by TCMSP,Swiss Target Prediction,Pharm Mapper,Similarity ensemble approach,Online Mendelian Inheritance in Man,DisGENT and database.The common targets of drugs and diseases were screened by Omishare and STRING database respectively,and the protein-protein interaction(PPI)network map was constructed.Then the interaction network between Hyp and disease targets was constructed by Cytoscape software and topological cross-linking analysis was carried out.Then the interaction network between Hyp and disease targets was constructed and cross-linked analysis was carried out by using Cytoscape software.The gene ontology(GO)of the core target was analyzed by David database,and then the related pathways of the core target were enriched by KEGG database.RESULTS A total of 54 GO enrichment processes were obtained by GO enrichment analysis of 44 common genes,including 38 biological processes(BP),15 cell composition(CC)processes,and 1 molecular functional(MF)process.43 items were obtained by signal pathway enrichment analysis in KEGG database.CONCLUSION It is suggested that the mechanism of Hyp may be related to PI3K-Akt,RAP1,RAS,VEGF and other signal transduction pathways.The above results laid a theoretical foundation for the study of the mechanism and clinical application of the treatment of ischemia/reperfusion injury.
基金Fund of Dean of Huachuang Institute of Areca Research-Hainan(HCBL2020YZ-012)。
文摘The morbidity and mortality of cardiovascular diseases are very high,which has attracted more and more attention all over the world.Common treatment methods for clinical treatment of acute myocardial infarction include direct percutaneous coronary intervention and coronary artery bypass grafting,which can quickly restore blocked coronary blood flow and reduce the infarct size.However,the inevitable ischemia/reperfusion injury will occur during the recovery of coronary blood flow,its pathological mechanism is complicated,and the Western medicine countermeasures are very limited.Among the current drugs for the treatment of cardiovascular diseases,traditional Chinese medicine has become a research hotspot due to its multiple targets,safety,and low side effects.Ginger is the fresh rhizome of Zingiber officinale Rosc.,a perennial herbaceous plant in the ginger family.It is a dual-purpose resource of medicine and food.Ginger has the functions of relieving the appearance and dispelling cold,warming up and relieving vomiting,resolving phlegm and relieving cough,and relieving fish and crab poison.The chemical components of ginger mainly include volatile oil,gingerol,diphenylheptane,etc..Among them,6-gingerol,as the main active component of gingerols,has obvious pharmacological effects in myocardial protection,anti-oxidation,anti-inflammatory,etc..Studies have shown that 6-gingerol protects myocardium mainly through anti-oxidative stress,anti-inflammatory,inhibiting cell apoptosis,and preventing calcium influx.①Anti-oxidative stress:oxidative stress is a state where oxidation and anti-oxidation in the body are out of balance,and it is also an important factor leading to myocardial damage.Many studies have confirmed that 6-gingerol has an antioxidant effect,and it is considered a natural antioxidant.6-gingerol can significantly reduce the degree of oxidative stress and the level of reactive oxygen species caused by cardiomyocyte damage,and has a significant cardioprotective effect.②Anti-inflammatory:inflammation can cause substantial cell damage and organ dysfunction,which is another important cause of myocardial damage.6-gingerol can reduce the levels of inflammatory factors such as interleukin-6,interleukin-1β,and tumor necrosis factor-αin cardiomyocytes,and at the same time inhibit the TLR4/NF-κB signaling pathway,an important regulatory pathway of inflammation,showing that it may improve myocardial damage through anti-inflammatory effects.③Inhibition of apoptosis:apoptosis is a complex and orderly process in the autonomous biochemical process of cells,and one of the main mechanisms of myocardial injury.This process can be roughly divided into three pathways:mitochondria,endoplasmic reticulum,and death receptors.Among them,the mitochondrial pathway plays an important role,and Bcl-2 and Bax located upstream of this pathway can regulate the entire process of cell apoptosis by regulating the permeability of the mitochondrial membrane.Studies have found that the preventive application of 6-gingerol can reduce cell damage,reduce the number of apoptotic cells,reduce the activity of Bax and caspase-3,and increase the expression of Bcl-2.Therefore,6-gingerol pretreatment can reduce the damage of cardiomyocytes,and its mechanism may be related to the inhibition of apoptosis.④Prevent calcium influx:calcium overload is involved in the pathogenesis of myocardial ischemic injury,which may be related to excessive contracture,arrhythmia,and mitochondrial Ca2+accumulation that impairs myocardial function.6-gingerol inhibits the increase of intracellular Ca2+concentration by inhibiting L-type calcium current,thereby reducing extracellular Ca2+influx,thereby avoiding calcium overload and playing a cardioprotective effect.In summary,6-gingerol can effectively treat and improve myocardial ischemia/reperfusion injury,and it has great development potential in the fields of medicine and health products.
基金This work supported by the National Natural Science Foundation of China (81470432) and Natural Science Foundation of Anhui Province Education Department (KJ2016A357).
文摘OBJECTIVE In this study we explored the role of Epac1-Rap1 pathway in the acute myocardial ischemia/reperfusion injury(MIRI) in vitro and in vivo.METHODS An acute myocardial ischemia/reperfusion injury model was established by the ligation of left anterior descending coronary.Myocardial architecture,fibers and apoptosis was evaluated by the Masson trichrome staining,Sirius red staining and TUNEL assay.H9c2 cells were subjected to hypoxia for 5 h followed by 1-h reoxygen.ation in vitro.Cell viability was measured by MTT assay and cellular injury was evaluated by measuring the release of lactate dehydrogenase(LDH).Western blot,real-time PCR and immunofluorescence were used to detect the expressions of Epac1 and relative downstream molecules.RESULTS Myocardial IR-induced cardiac apoptosis and accumulation of Epac1 and Rap1 in rat IR injury model.Direct Epac activation by 8-CPT(8-(4-chlorophenylthio)-2′-O-methyl-cAMP) exacerbated cardiomyocyte death and dysfunction following hypoxia-reoxygenation(H/R),selective activation of Epac in response to H/R was evident which enriched for cytosolic/membrane proteins and mRNA.Harmacological inhibitor of Epac(ESI-09) significantly ameliorated myocardial injury with the decline of Epac expression.Epac inhibitor and agonist studies also implicated the effect of Rap1,which is downstream of Epac in this pathway.The expression of Rap1 elevated when activated by Epac agonist and was blocked by Epac inhibitor.The same result was true for myocyte CaMK-II and intracellular calcium ions activation.Moreover,ESI-09 also increased ERK1/2 phosphorylation.CONCLUSION Our study reveal that Epac1/Rap1 signaling pathway is involved in the pathogenesis of myocardial I/R injury in rats,which provides evidence on the development of therapeutic strategies target this pathway for myocardial I/R injury.
基金National Natural Science Foundation of China(81560585)Program for Excellent Young Talentsof Zunyi Medical University(15zy-002)+2 种基金Scienceand Technology Innovation Talent Team of GuizhouProvince(20154023)the hundred”Level of High—level Innovative Talents in Guizhou Province(QKHRCPT 20165684):Education Department of Guizhou Province of China[GNYL(2017)006,YLXKJS—YS一06]Program for Changjiang Scholars and lnnovative Research Team in University,China(IRT-17R113).
文摘OBJECTIVE To explore the effects and mechanism of icariside Ⅱ(ICS Ⅱ),a pharmacologically active compound derived from herbal Epimedii with previous study-proved phosphodiesterase 5(PDE5) inhibitors,was investigated in vivo using a middle cerebral artery occlusion/reperfusion(MCAO/R) model in rats and in vitro using an oxygen-glucose deprivation/reperfusion(OGD/R) model in primary hippocampal neurons.METHODS Laser Doppler flowmeter was introduced to examine the cerebral blood flow of MCAO/R rats.The neurological deficits scores,brain water content and infarction volume were assessed after MCAO/R.OGD/R-induced primary hippocampal neuronal injury and apoptosis were examined by MTT,lactate dehydrogenase(LDH) release,TUNEL staining and flow cytometry,respectively.Expressions of PDE5 A and memory-related signaling pathways were measured using Western blotting analysis.The direct interaction between ICS Ⅱand PDE5 was further evaluated by molecular docking.RESULTS ICS Ⅱ significantly decreased the infraction volume in MCAO/R rats.Furthermore,ICS Ⅱ significantly abrogated OGD/R-induced hippocampal neuronal death.Moreover,ICSⅡ not only effectively restored the 3′ 5′-cyclic guanosine monophosphate(cGMP) level and protein kinase G(PKG) activity both in vivo and in vitro,but also increased brain-derived neurotrophic factor(BDNF),tyrosine protein kinase B(TrkB) and cAMP response element-binding protein(CREB) expressions,thereby inhibited hippocampal neuronal apoptosis.Mechanistically,the beneficial effects of ICS Ⅱ was attributed to its activation of the PKG/TrkB/BDNF via increasing BDNF expression,evidenced by that the inhibition effects of ICSⅡ was abrogated by Rp-8-BrcGMPS,a PKG inhibitor,or ANA-12,a TrkB inhibitor.ICSⅡ also decreased both protein level and activity of PDE5.Notably,ICSⅡ might effectively bind and inhibite PDE5 as demonstrated by relatively high binding score.CONCLUSION ICSⅡ significantly protect against cerebral ischemia/reperfusion injury in rats and rescues OGD/Rinduced hippocampal neuronal injury,and the underling mechanisms are,at least partly,due to inhibition of PDE5 and activation of BDNF/TrkB/CREB signaling pathway.Hence ICS Ⅱ may be an effective agent for combating cerebral ischemia/reperfusion injury.
文摘Aim Reduction of Sheng-Nao-Kang decoction （RSNK）, is a modified traditional Chinese medicinal formula of Sheng-Nao-Kang pill preparation, which is protective in rats against focal cerebral ischemia/reperfusion （I/R） injury. In the current study, we investigate the protective effect of RSNK against apoptosis and oxidative damage induced by cerebral I/R and explore the underlying mechanisms. Cerebral I/R injury was induced by in- traluminal middle cerebral artery occlusion （MCAO） for 2 h followed by reperfusion for 24 h in adult male Sprague- Dawley rats. Rats were randomized into seven groups （n- 8）： Sham group, I/R group, RSNK-treated groups （ 0.7 g · kg ^- 1, 1 . 4 g · kg ^- 1 and 2. 8 g · kg^ - 1 ） , nimodipine （NMP） -treated group and Whitmania pigra Whitman （WW）-treated group. Neurological deficit scores, cerebral humidity content and cerebral infarction volume were measured after the 24 h reperfusion. Malondialdehyde （ MDA）, superoxide dismutase （ SOD）, catalase （ CAT）, inducible nitric oxide synthase （iNOS） and total nitric oxide synthase （TNOS） in serum were measured by assay kits for biochemical analysis. Histological structures of the cortex of the ipsilateral ischemic cerebral hemisphere in rats were observed by Nissl staining. The caspase-3 protein content in the hippocampus and cortex was detected by immunohistochemistry. Additionally, Bax and Bcl-2 protein expressions in the injured brain were evaluated by Western blot. RSNK administration not only markedly improved neurological deficit scores, but also reduced cere- bral humidity content and cerebral infarction volume, lowered MDA content, up-regulated SOD and CAT levels, down-regulated iNOS and TNOS levels, restrained the expression of caspase-3 positive protein and alleviated the Bax and Bcl-2 protein expressions.
基金The project supported by NSFC(81171079,81271312)
文摘OBJCETIVE Epidemiologic studies have demonstrated that consumption of moderate amounts of red wine is associated with significant reductions in incidences of cardiovascular and cerebrovascular diseases,which may be related to alcohol in red wine.Our previous study demonstrated that ethanol ingestion 24 h prior to induction of cerebral ischemic/reperfusion(I/R)reduced delayed neuronal death(DND).Our most recent results supported a role for big Ca2+-sensitive K+channel(BKCa channel)activation in the neuroprotective effects of ethanol preconditioning(Et OH-PC)in global cerebral I/R.Therefore,we hypothesis that moderate Et OH-PC activates BKCa channel to protect brain damage induced by focal cerebral I/R.This project will utilize focal cerebral I/R animal model to explore the function of BKCa channel in Et OH-PC protection in vivo levels by means of pharmacological intervention such as BKCa channel opene(rNS11021,NS)and blocke(rpaxilline,PX).The results will provide theoretical evidence for neuroprotective effect of moderate alcohol preconditioning against ischemic stroke,and the conclusion will also bring to a concept that extrinsic moderate ethanol preconditioning may activate intrinsic protective mechanism in the brain.METHODS The SD rat were randomly divided into the following six groups(n=10):sham,I/R,Et OH-PC+I/R,NS11021-PC+I/R,paxilline+Et OH-PC+I/R,Paxilline+NS11021-PC+I/R.Both Et OH-PC and NS11021-PC(0.1mg·kg-1;ip)were induced 24 h before I/R.The volume of 95%ethanol to be instilled(inμL)was calculated as follows:〔body weight(g)×0.6〕+0.3.This volume of ethanol was mixed in 0.3 m L of sterile distilled water just before administration to the animals by gavage.The Paxilline(2.5 mg·kg-1;ip)was administered 10min beforeEt OH-PC and NS11021-PC.The right middle cerebral artery occlusion(MCAO)was produced by inversion of a 4-0-nylon filament.The filament was withdrawn 2 h after onset of MCAO and then reperfused.Neurological deficits and infarct volume were measured 24 h after I/R.Another 36 rats were randomly divided into 6 groups as above,6 in each group.DWI were performed 2h after ischemic and T2WI MRI were performed 24 h after I/R to observe the infarct volume of brain and the penumbra volume of brain in each group.Then rats were killed and detected the apoptotic cell death and degeneration of neurons.RESULTS Compared to I/R group,the neurological score(P<0.01),the infarct volume of brain(P<0.01),the infarct volume of ischemic penumbra(P<0.01),the percentage of apoptotic cell death(P<0.01)and the percentage of degenerative neurons(P<0.01)were significantly decreased after ethanol preconditioning,while these changes were reversed by paxilline(P<0.05);compared to I/R group,the neurological score(P<0.01),the infarct volume of brain(P<0.01),the infarct volume of ischemic penumbra(P<0.01),the percentage of apoptotic cell death(P<0.01)and the percentage of degenerative neurons(P<0.01)were significantly decreased after NS11021 preconditioning,while these changes were reversed by paxilline(P<0.05).CONCLUSION Our results show that moderate alcohol preconditioning activates BKCa channels to protect brain damage induced by focal cerebral I/R.
基金The project supported by National Natural Science Foundation of China(81603315 81730096+4 种基金 81373551 81730093U1402221)CAMS Innovation Fund for Medical Sciences(CIFMS)(2016-I2M-1-004)the Opening Program of Shanxi Key Laboratory of Chinese Medicine Encephalopathy(CME-OP-2017001)
文摘OBJECTIVE Ginsenoside Rg1(Rg1),a purified compound from Panax ginseng,has been well documented to be effective against ischemia/reperfusion(I/R) neurotoxicity.However,the underlying mechanism is stil obscure.METHODS The anti-I/R effect of Rg1 were investigated in vitro and in vivo,and the dynamics of nuclear accumulation and the transcriptional activity of NF-E2-related factor 2(Nrf2) determined by Western blotting and Dual Luciferase Reporter Assay,respectively.Nrf2 siRNA was employed to investigate Nrf2′s role in the protective effect of Rg1 against I/R.Furthermore,the role of miR-144,which could regulate post-translational Nrf2 levels,was investigated in the anti-I/R effect of Rg1 by injection of AAV-hypoxia-inducible factor miR-144-shRNA in the predicted ischemic penumbra.RESULTS It was found that the anti-I/R effect of Rg1 was related to its anti-oxidative capacity,which is mainly regulated by the Nrf2/antioxidant response element(ARE) pathway.Further study suggested that Rg1 contributes to the enhancement of the Nrf2/ARE pathway,as manifested by increasing the dynamic peak content of Nrf2,which prolonged the maintenance stage,and promoting the expression of ARE-target genes after oxygen glucose deprivation/reperfusion(OGD/R) in PC12 cells.Nrf2-siRNA application significantly reduced these changes.Furthermore,the enhancement of the Nrf2/ARE pathway by Rg1 was independent of disassociation from Keap1;rather it was a result of posttranslational regulations.It was found that Rg1 significantly reduced the expression of miR-144,which down-regulates Nrf2 production by targeting its 3′-untranslated region,after OGD/R.Knockdown of Nrf2 showed no effect on the expression of miR-144,indicating that miR-144 is an upstream regulator of Nrf2.Moreover,direct binding between Nrf2 and miR-144 in the PC12 cells was identified.Application of anti-miR-144 significantly reduced Rg1′s anti-OGD/R capacity.Final y,the role of miR-144 in Rg1′ s anti-I/R effect was tested by inhibiting miR-144 in the predicted ischemic penumbra when hypoxia-inducible-factor was activated.The results showed that loss of miR-144 abolished the anti-I/R effect of Rg1,which included reduced infarct volume,improved neurological scores,attenuated oxidative impairment,as well as activation of the Nrf2/ARE pathway.CONCLUSION Oxidative stress after I/R is alleviated by Rg1 through inhibition of miR-144 activity and subsequent promotion of the Nrf2/ARE pathway at the post-translational level.
文摘Aim Shengmai injection （SMI） , a Chinese patent medicine deprived from an ancient Chinese herbal compound Shengmai san, which is used extensively for the treatment of cardiovascular and cerebrovascular disease in clinic. To determine the neuroprotective effect of SMI, the effect and the relevant mechanism of SMI had been inves- tigated on cerebral ischemia-reperfusion injury in mice. Methods Right middle cerebral artery was occluded by in- serting a thread through intemal carotid artery for 1 h, and then reperfusion for 24 h in mice. Neuroprotective effect was testified using transmission electron microscopic examination, evaluation of infarct volume and neurological defi- cits. Related mechanism was evaluated by western blotting. The SMI was injected intraperitoneally after ischemia for 1 h at doses of 1.42, 2. 84 and 5.68 g · kg^-1. The control group received saline as vehicle of SMI. Results SMI （ 1.42, 2. 84 and 5. 68 g · kg^-1） could significantly reduced the infarct volume, SMI （5.68 g · kg^-1） could signifi- cantly improved the neurological deficits, as well as the neuron＇s morphology change. SMI （5.68 g · kg^-1） could significantly inhibited the autophagy-related proteins： Beclinl and LC3. SMI （5. 68 g · kg^-1） remarkably inhibited the phosphorylation of adenosine monophosphate activated protein kinase （AMPK）, and down-regulated the phospho- rylation of mammalian target of rapamycin （roTOR） and Jun N-terminal kinase （JNK） after 24 h reperfusion. Con-clusion The results indicated that SMI elicits potent protection against cerebral ischemia/reperfusion injury, which may partly be due to the inhibition in autophagy and related signal pathways.
文摘We recently reported that nucleotide-binding oligomerization domain （NOD） 2, an important cytoplasmic pattern recognition receptor, is involved in cerebral ischemia-reperfusion （I/R） injury. β-arrestins, in addition to regulate desensitization of G protein-coupled receptors （GPCRs） , have emerged as potential mediators of innate im- mune activation. However, the role and mechanism of β-arrestin2 in NOD2-triggered signaling in the cerebral I/R remain to be established. Methods BV2 cells were transfected with either β-arrestin2-shRNA plasmid or β-arres- tin2 full-length plasmid and control vector. Middle cerebral artery occlusion （MCAO） was induced in male wild- type mice and in wild type （WT） and β-arrestin2 deficient mice. Results muramyl dipeptide （MDP）, an extrin- sic ligand of NOD2, significantly increased the expression of TRAF6 and COX-2 and enhanced the activation of NF- KB in the microglia time-dependently. MDP stimulation also promoted the expression and activation of MMP-9 time- dependently, but did not affect MMP-2 obviously. Additionally, β-arrestin 2 interacted with TRAF6 after MDP stim- ulation rapidly. Overexpression of β-arrestin2 inhibited NF-KB and MMP-9 activation and COX-2 upregulation in- duced by MDP, while silence of β-arrestin2 enhanced NOD2-triggered inflammatory signaling. Finally, Deletion of β-arrestin 2 markedly aggravated brain infarction, neurological deficit and inflammation induced by MDP in mice subjected to MCAO. Conclusion The results provide the first evidence that β-arrestin 2 is an essential negatively regulator of NOD2 triggered inflammatory signaling in the cerebral I/R injury.
基金National Natural Science Foundation of China(81603267)Fundamental Research Funds for the Central UniversitiesShaanxi Key Laboratory of "Qiyao"Resources and Anti-tumor Activities
文摘OBJECTIVE The total steroid saponins(TSSN)isolated from Dioscorea zingiberensis C.H.Wright(D.zingiberensis)has shown a variety of beneficial bioactivities.However,there are no reports about the neuroprotective effects of the TSSN until now.Therefore,we explored the neuroprotective effects of TSSN on rats against transient focal cerebral ischemia-reperfusion(I/R)and the underlying mechanisms.METHODS The healthy adult Sprague-Dawley rats were randomly assigned into six groups.After pre-treatment with the TSSN intragastrically for six days,the rats were subjected to the ischemia injury by the surgery of middle cerebral artery occlusion(MCAO)for 90 min.Some indexes were evaluated and detected.RESULTS As compared to the I/R group,TSSN group of rats,especially given the 30 mg·kg^-1 of TSSN,not only marked reduction in the neurological deficit scores,cerebral infarct volume,and brain edema,but also an increase in neuron survival(Nissl bodies)in the hippocampal cornuammons 1(CA1)and cortex hemisphere of the ipsilateral ischemia.At the same time,the inflammatory cytokines in serum induced by MCAO were significantly alleviated by the TSSN pre-administration.What′s more,the increase of caspase-3 was evidently reduced in the CA1 and cortex of the hemisphere injured brain.Finally,the down-regulating anti-apoptotic Bcl-2 and up-regulating pro-apoptotic Bax proteins were obviously suppressed.CONCLUSION TSSN plays a potential neuroprotective role against a severe injury induced by transient focal cerebral ischemic reperfusion in a rat experimental model,and this role may be mediated by its antiinflammatory and anti-apoptotic actions.
基金National Natural Science Foundation of China(81173596)Natural Science Foundation of the Department of Education of Anhui Province(KJ2015A157)
文摘OBJECTIVE To investigate regulatory effects of hyperoside(Hyp)on IP3/PKC/TRPV4 pathway in rat cerebral basilar artery(CBA)subjected to global cerebral ischemia-reperfusion(I/R).METHODS The model of global cerebral I/R in rats was established by four-vessel occlusions methods.The treated rats were administrated with Hyp(50 mg·kg^-1)group,Hyp(50 mg·kg^-1)+HC-067047(10 mg·kg^-1),Hyp(50 mg·kg^-1)+2APB(2 mg·kg^-1),Hyp(50 mg·kg^-1)+BisI(2.5 mg·kg^-1),Hyp(50 mg·kg^-1)+2APB(2 mg·kg^-1)+BisI(2.5 mg·kg^-1).Hematoxylin-eosin(HE)and Nissl staining were performed and the contents of methane dicarboxylic aldehyde(MDA),neuron-specific enolase(NSE),S100β and the activity of lactic dehydrogenase(LDH)in serum were measured by enzyme-linked immunosorbnent assay(ELISA).The specific blocker N-nitro-L-arginine-methyl-ester(L-NAME)and indomethacin(Indo)were used to delete the prostacyclin(PGI2)and nitric oxide(NO)dependent relaxation.The protein expression level of TRPV4 was detected by Western blotting.Ca2+intensity in vascular smooth muscle cells was measured by confocal laser scanning microscope and flow cytometry was performed to observe the apoptosis of CBA endothelial cells after in vivo administration.RESULTS Hyp induced a dose-dependent relaxation of CBA in IR rats via a PGI2 and NO independent manner,as evidenced by alleviated patho⁃logical changes and up-regulated expression of TRPV4 protein in the endothelial cells from cerebral vessels.Hyp signifi⁃cantly reduced the contents of MDA,NSE,S100βand the activity of LDH in serum and decreased the fluorescence intensity of Ca2+in cerebral vascular smooth muscle cells by in vivo administration.The apoptotic rate of endothelial cells in Hyp treated group was significantly less than that in IR group.CONCLUSION Hyp does in fact ameliorate I/R injury by regulatingIP3/PKC/TRPV4 pathway.
基金National Natural Science Foundation of China(U160312581473330+5 种基金8187276881673323)Fundamental Research Funds for the Central Universities of China(N182008004N182006001)Liaoning Revitalization Talents Program(XLYC1807118)Liaoning BaiQianWan Talents Program(2018)
文摘OBJECTIVE Learning and memory impairment is one of the common sequelae of stroke patients,which is called"post-stroke dementia"and seriously affects the quality of life of the patients.For post-stroke dementia,there is still no effective clinical treatment.In the present study,we aim to investigate the effect of the active ingredient of Ferula sinkiangensis,AW09,on global cerebral ischemia-reperfusion mice.METHODS The bilateral common carotid artery occlusion(BCCAO)reperfusion model was used to investigate the protective effect of AW09 on cognitive dysfunction in mice with global cerebral ischemia reperfusion.Y-maze and Morris water maze were used to test the learning and memory ability of mice.RESULTS Y-maze test showed that AW09 treatment significantly increased the spontaneous alternation rate of BCCAO model animals and had no significant effect on the total number of arm entries.The results of Morris water maze showed that AW09 significantly reduced the escape latency of BCCAO mice during the training period.During the probe test phase,AW09 significantly increased the swimming time in target quadrant,distance in target quadrant and number of platform crossings and decreased the swimming time in the quadrant opposite the target quadrant of BCCAO mice.CONCLUSION AW09,the active ingredient of Ferula sinkiangensis,can improve working memory impairment and spatial memory impairment in animals with global cerebral ischemia-reperfusion,suggesting that AW09 has poten⁃tial therapeutic value for cognitive dysfunction caused by global cerebral ischemia.
文摘Renal ischemia reperfusion injury increases renal generation of angiotensin II （Ang Ⅱ） which could wors- en renal vasocontraction. Thus, we investigated the hypothesis that renal ischemia reperfusion injury alters renal af- ferent arteriolar responses to Ang II via production of hydrogen peroxide （ H202 ）, or superoxide （ O2 ） or via al- tered angiotensin type 1 receptor （AT1R） expression. Afferent arterioles of mouse kidneys 24h after renal ischemia repeffusion or sham procedures were isolated and perfused. Responses to Ang II or norepinephrine （NE） were as- sessed by measurement of arteriolar luminal diameter. The mRNA expressions of AT1 receptor （ AT1 R） and AT2 re- ceptor （ATzR） were evaluated by quantificational real-time polymerase chain reaction. Compared to sham group, afferent arterioles from mouse kidneys after renal ischemia reperfusion had impaired contractions to Ang II （ -4.63 ± 3.06） % versus （ - 29.95 ± 1.31 ） % at 10 -9 tool · ^-1, p 〈 0.05 , （ - 27.07 ± 1 50） % versus （ - 41 74 ± 0.60） % at 10^-7 tool · L^-1, P 〈 0.05 ） that were normalized by incubation with PEG-catalase , but unaffected by PEG-SOD. However, the NE responses of afferent arterioles after renal ischemia reperfusion were unchanged. Com- pared to the sham group, renal ischemia reperfusion significantly increased the renal cortical H202 （0. 123 ± -1 0. 006） versus （0. 087 ± 0. 003） mmol·mg protein, P 〈 0.01 ）, reduced catalase activity [ （ 14.81 ± 3.22） ver- sus （28.49 ± 1.62） units · mg^-1 protein, P 〈 0.01 ] and downregulated mRNA for AT1R （0.27 ± 0.02 versus 0.95 ± 0.02, P 〈 0.01 ）. We conclude that afferent arteriolar responses to Ang II are impaired selectively in mice after renal ischemia reperfusion by accumulation of H202 and reduced expression of AT1R.
基金National Natural Science Foundation of China(8166070081260679)Ningxia Col ege First-Class Discipline Construction Project(Chinese Medicine)Funded Project(NXYLXK2017A06)
文摘OBJECTIVE TO investigate the neural protection of dehydrocostus lactone(DHL)against neuronal injury induced by oxygen and glucose deprivation/reperfusion(OGD/R)in differentiated PC12 cells.METHODS We used a cellular model of 2 h of OGD and 24 h of reperfusion to mimic cerebral ischemia-reperfusion injury.Cell viability was used to reflect the degree of OGD/R-induced injury.Cells were treated with DHL during the reperfusion phase.Cell Counting Kit(CCK-8)and LDH assays were performed to determine the optimal dose of DHL and cell viability.Flow cytometry analysis and Monodansylcadaverine(MDC)staining were then conducted to detect apoptosis rate and autophagosome formation after OGD/R in PC12 cells.Immunofluorescence and Western blotting analyses were used to detect the expres⁃sion of proteins associated with autophagy and apoptosis.RESULTS OGD/R significantly decreased cell viability and increased apoptosis rate.The expression levels of autophagy-related proteins,namely,LC3 and Beclin-1,and apoptosisrelated proteins,namely,Bax and caspase-3 increased,but that of the anti-apoptosis Bcl-2 protein decreased.However,DHL attenuated OGD/R-induced neuronal injury through inhibition of apoptosis and autophagy properties by modulating au⁃tophagy-associated proteins(LC3 and Beclin-1)and apoptosis-modulating proteins(caspase-3 and Bcl-2/Bax).CONCLU⁃SION Our data provide an evidence for the neuroprotective effect of DHL against ischemic neuronal injury.Hence,DHL could be a promising candidate for treatment of ischemic stroke.
