This paper discusses the influence of Sb/In ratio on the transport properties and crystal quality of the 200 nm InAs_(x)Sb_(1-x)thin film.The Sb content of InAs_(x)Sb_(1-x)thin film in all samples was verified by HRXR...This paper discusses the influence of Sb/In ratio on the transport properties and crystal quality of the 200 nm InAs_(x)Sb_(1-x)thin film.The Sb content of InAs_(x)Sb_(1-x)thin film in all samples was verified by HRXRD of the symmetrical 004 reflections and asymmetrical 115 reflections.The calculation results show that the Sb component was 0.6 in the InAs_(x)Sb_(1-x)thin film grown under the conditions of Sb/In ratio of 6 and As/In ratio of 3,which has the highest electron mobility(28560 cm^(2)/V·s)at 300 K.At the same time,the influence ofⅤ/Ⅲratio on the transport properties and crystal quality of Al_(0.2)In_(0.8)Sb/InAs_(x)Sb_(1-x)quantum well heterostructures also has been investigated.As a result,the Al_(0.2)In_(0.8)Sb/InAs_(0.4)Sb_(0.6)quantum well heterostructure with a channel thickness of 30 nm grown under the conditions of Sb/In ratio of 6 and As/In ratio of 3 has a maximum electron mobility of 28300 cm^(2)/V·s and a minimum RMS roughness of 0.68 nm.Through optimizing the growth conditions,our samples have higher electron mobility and smoother surface morphology.展开更多
目的:探讨姜黄素对APP/PS1双转基因鼠海马组织中三磷酸腺苷结合盒转运子A1(ATP binding cassette transport protein A1,ABCA1)和载脂蛋白A1(apolipoprotein A1,apoA1)的表达及血清中总胆固醇(total cholesterol,TC)和高密度脂蛋白(high...目的:探讨姜黄素对APP/PS1双转基因鼠海马组织中三磷酸腺苷结合盒转运子A1(ATP binding cassette transport protein A1,ABCA1)和载脂蛋白A1(apolipoprotein A1,apoA1)的表达及血清中总胆固醇(total cholesterol,TC)和高密度脂蛋白(high-density lipoprotein,HDL)含量的影响。方法:用APP/PS1双转基因鼠建立阿尔茨海默病(Alzheimer’s disease,AD)模型,不同浓度姜黄素饲料喂养6个月。免疫组化SP法检测转基因鼠的海马组织CA1区ABCA1和apoA1的表达变化。胆固醇酶法比色法检测血清中TC和HDL的含量。结果:经过不同浓度姜黄素饲喂转基因鼠后,其海马组织CA1区ABCA1和apoA1的表达增加(P=0.005和0.003;P=0.025和0.001),且血清中HDL的含量也随之增加,TC的含量逐渐减少,其差异均有统计学意义(P=0.041和0.010;P=0.046和0.002)。结论:ABCA1在AD的发生发展中起着重要的作用,姜黄素可能是通过增加ABCA1表达和升高apoA1和HDL含量降低胆固醇水平。展开更多
目的探讨高迁移率族蛋白A1(HMGA1)在脂多糖诱导的脓毒症心肌病小鼠心肌细胞焦亡中的作用及其机制。方法选择雄性C57BL/6小鼠40只,随机数字表法分为对照1组[9型腺相关病毒(AAV9)-对照]、对照2组(AAV9-HMGA1)、脂多糖1组(AAV9-对照+脂多糖...目的探讨高迁移率族蛋白A1(HMGA1)在脂多糖诱导的脓毒症心肌病小鼠心肌细胞焦亡中的作用及其机制。方法选择雄性C57BL/6小鼠40只,随机数字表法分为对照1组[9型腺相关病毒(AAV9)-对照]、对照2组(AAV9-HMGA1)、脂多糖1组(AAV9-对照+脂多糖)、脂多糖2组(AAV9-HMGA1+脂多糖),每组10只。半胱氨酸天冬氨酸蛋白酶1(Caspase-1)免疫组织化学染色检测细胞焦亡水平,免疫荧光染色检测核苷酸结合寡聚化结构域样受体蛋白3(NLRP3)表达,蛋白免疫印迹法检测NLRP3、凋亡相关斑点样蛋白(ASC)、B淋巴细胞瘤-2基因(Bcl-2)表达,RT-PCR检测白细胞介素(IL)-1β和IL-18的mRNA表达。结果免疫组织化学染色显示,脂多糖1组Caspase-1表达较对照1组明显增加;脂多糖2组Caspase-1表达较脂多糖1组明显增加。免疫荧光染色显示,脂多糖1组NLRP3表达较对照1组明显增加;脂多糖2组NLRP3表达较脂多糖1组明显增加。蛋白免疫印迹结果显示,与对照1组比较,脂多糖1组NLRP3、ASC表达明显上调,Bcl-2表达明显下调(P<0.05);与脂多糖1组比较,脂多糖2组NLRP3、ASC表达明显上调,Bcl-2表达明显下调(P<0.05)。RT-PCR结果显示,与对照1组比较,脂多糖1组IL-1β、IL-18 mRNA表达明显升高(P<0.05);与脂多糖1组比较,脂多糖2组IL-1β、IL-18 mRNA表达明显升高(2.45±0.27 vs 1.81±0.15,2.54±0.24 vs 1.82±0.19,P<0.05)。结论HMGA1可以加重脂多糖诱导的脓毒症心肌病小鼠心肌细胞焦亡,通过上调Caspase-1依赖性途径加重细胞焦亡,通过下调抗凋亡蛋白Bcl-2加重细胞凋亡。展开更多
OBJECTIVE To investigate the neuroprotective effects of quercetin on central neurons against chronic high glucose in central neurons,in relation to Nrf2/ARE/Glo-1 activation.METHODS SH-SY5Y cells were cultured with hi...OBJECTIVE To investigate the neuroprotective effects of quercetin on central neurons against chronic high glucose in central neurons,in relation to Nrf2/ARE/Glo-1 activation.METHODS SH-SY5Y cells were cultured with high glucose(HG,70 mmol·L^(-1)),4-fold of the normal glucose(17.5 mmol·L^(-1)).Quercetin was set three concentrations(5,10,20μmol·L^(-1)),with Nrf2 activator sulforaphane(SFN)as a positive group(2.5μmol·L^(-1)).After 72 h,cells were collected for glyoxalase 1(Glo-1)activity and GSH level were by spectrophotometry;advanced glycation end-products(AGEs)as well as nuclear Nrf2 and p-Nrf2 levels by immunofluorescence;Glo-1,γ-glutamycysteine synthase(γ-GCS),Nrf2 and p-Nrf2 protein levels by Western blotting,and Glo-1 andγ-GCS m RNA levels by real-time qP CR.RESULTS Quercetin increased the cell viability of SH-SY5Y cells,and upregulated the levels of Glo-1 activity,protein,and m RNA in SH-SY5Y cells cultured with HG,accompanied by the elevated levels of glutathione,a cofactor of Glo-1 activity,and the reduced levels of AGEs.Meanwhile,quercetin could increase p-Nrf2 and Nrf2 levels in nucleus as well as p-Nrf2 levels in cytosol of SH-SY5Y cells exposed to chronic HG,accompanied by the elevated protein expression and m RNA levels ofγ-GCS,a known target gene of Nrf2/ARE signaling.Moreover,a PKC activator or a p38MAPK inhibitor pretreatment could significantly increase the protein expression ofγ-GCS in HG condition,but an alkylating agent for sulfydryl of cysteine in Keap 1,a negative regulator of Nrf2,pretreatment only showed an increased tendency ofγ-GCS protein,compared with without pretreatment;however,after pretreatment with those tool drugs,co-treatment with quercetin and HG had similar results to those of single tool drug pretreatment followed by HG exposure.CONCLUSION Firstly,quercetin can enhance Glo-1 function in central neurons,which is mediated by activation of Nrf2/ARE pathway,then exerts the neuroprotection against HG induced damage;moreover,PKC and p38 MAPK pathways may be involved in Nrf2 inactivation in chronic HG condition.展开更多
目的基于沉默信息调节因子1(silent information regulator 1,SIRT1)/高迁移率族蛋白B1(high mobility group protein B1,HMGB1)/核转录因子-κB(nuclear transcription factor-κB,NF-κB)信号轴探讨丹参绞股蓝茶对四氯化碳(carbon tet...目的基于沉默信息调节因子1(silent information regulator 1,SIRT1)/高迁移率族蛋白B1(high mobility group protein B1,HMGB1)/核转录因子-κB(nuclear transcription factor-κB,NF-κB)信号轴探讨丹参绞股蓝茶对四氯化碳(carbon tetrachloride,CCl4)所致小鼠急性肝损伤肝细胞炎症凋亡反应的抑制作用和机制研究。方法C57BL/6小鼠随机分为正常组、模型组、白藜芦醇组、丹参绞股蓝茶低、中、高剂量组、阳性药组,连续灌胃给药14 d。采用腹腔注射0.5%CCl4橄榄油溶液(5 mL/kg)的方法建立小鼠急性肝损伤模型。生化法检测小鼠血清中丙氨酸转移酶(alanine transferase,ALT)、天冬氨酸转移酶(aspartate transferase,AST)、乳酸脱氢酶(lactate dehydrogenase,LDH)及肝组织羟脯氨酸(hydroxyproline,Hyp)、丙二醛(malonaldehyde,MDA)和超氧化物歧化酶(superoxide dismutase,SOD)水平;酶联免疫吸附法检测血清炎性因子肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)、白细胞介素-6(interleukin-6,IL-6)和白细胞介素-1β(interleukin-1β,IL-1β)水平;苏木素-伊红(HE)染色和TUNEL染色检测肝组织病理形态结构和肝细胞凋亡情况;Western Blot检测SIRT1、HMGB1和NF-κB蛋白表达。结果与正常组比较,模型组小鼠血清ALT、AST、LDH水平和肝组织Hyp活性显著升高,以及肝组织中MDA和SOD活性明显降低,血清炎性因子TNF-α、IL-6和IL-1β水平显著升高(P<0.05或P<0.01),肝组织存在明显的病理损伤以及肝细胞凋亡情况,肝组织中SIRT1蛋白的表达明显降低,HMGB1和NF-κB蛋白的表达升高;与模型组比较,丹参绞股蓝茶高剂量组和白藜芦醇组小鼠血清肝功能指标ALT、AST、LDH水平和肝组织Hyp活性显著降低,以及肝组织中MDA和SOD活性明显增加,血清炎性因子TNF-α、IL-6和IL-1β水平显著降低,肝组织的病理损伤以及肝细胞凋亡情况得到明显改善,肝组织中SIRT1蛋白表达增加,HMGB1和NF-κB蛋白的表达降低(P<0.05或P<0.01)。结论丹参绞股蓝茶能有效保护急性肝损伤,其作用机制可能与调控SIRT1/HMGB1/NF-κB信号通路,减轻肝细胞炎性凋亡有关。展开更多
基金Supported by the Natural Science Basic Research Program of Shaanxi Province(2023-JC-QN-0758)Shaanxi University of Science and Technology Research Launch Project(2020BJ-26)Doctoral Research Initializing Fund of Hebei University of Science and Technology,China(1181476).
文摘This paper discusses the influence of Sb/In ratio on the transport properties and crystal quality of the 200 nm InAs_(x)Sb_(1-x)thin film.The Sb content of InAs_(x)Sb_(1-x)thin film in all samples was verified by HRXRD of the symmetrical 004 reflections and asymmetrical 115 reflections.The calculation results show that the Sb component was 0.6 in the InAs_(x)Sb_(1-x)thin film grown under the conditions of Sb/In ratio of 6 and As/In ratio of 3,which has the highest electron mobility(28560 cm^(2)/V·s)at 300 K.At the same time,the influence ofⅤ/Ⅲratio on the transport properties and crystal quality of Al_(0.2)In_(0.8)Sb/InAs_(x)Sb_(1-x)quantum well heterostructures also has been investigated.As a result,the Al_(0.2)In_(0.8)Sb/InAs_(0.4)Sb_(0.6)quantum well heterostructure with a channel thickness of 30 nm grown under the conditions of Sb/In ratio of 6 and As/In ratio of 3 has a maximum electron mobility of 28300 cm^(2)/V·s and a minimum RMS roughness of 0.68 nm.Through optimizing the growth conditions,our samples have higher electron mobility and smoother surface morphology.
文摘目的:探讨姜黄素对APP/PS1双转基因鼠海马组织中三磷酸腺苷结合盒转运子A1(ATP binding cassette transport protein A1,ABCA1)和载脂蛋白A1(apolipoprotein A1,apoA1)的表达及血清中总胆固醇(total cholesterol,TC)和高密度脂蛋白(high-density lipoprotein,HDL)含量的影响。方法:用APP/PS1双转基因鼠建立阿尔茨海默病(Alzheimer’s disease,AD)模型,不同浓度姜黄素饲料喂养6个月。免疫组化SP法检测转基因鼠的海马组织CA1区ABCA1和apoA1的表达变化。胆固醇酶法比色法检测血清中TC和HDL的含量。结果:经过不同浓度姜黄素饲喂转基因鼠后,其海马组织CA1区ABCA1和apoA1的表达增加(P=0.005和0.003;P=0.025和0.001),且血清中HDL的含量也随之增加,TC的含量逐渐减少,其差异均有统计学意义(P=0.041和0.010;P=0.046和0.002)。结论:ABCA1在AD的发生发展中起着重要的作用,姜黄素可能是通过增加ABCA1表达和升高apoA1和HDL含量降低胆固醇水平。
文摘目的探讨高迁移率族蛋白A1(HMGA1)在脂多糖诱导的脓毒症心肌病小鼠心肌细胞焦亡中的作用及其机制。方法选择雄性C57BL/6小鼠40只,随机数字表法分为对照1组[9型腺相关病毒(AAV9)-对照]、对照2组(AAV9-HMGA1)、脂多糖1组(AAV9-对照+脂多糖)、脂多糖2组(AAV9-HMGA1+脂多糖),每组10只。半胱氨酸天冬氨酸蛋白酶1(Caspase-1)免疫组织化学染色检测细胞焦亡水平,免疫荧光染色检测核苷酸结合寡聚化结构域样受体蛋白3(NLRP3)表达,蛋白免疫印迹法检测NLRP3、凋亡相关斑点样蛋白(ASC)、B淋巴细胞瘤-2基因(Bcl-2)表达,RT-PCR检测白细胞介素(IL)-1β和IL-18的mRNA表达。结果免疫组织化学染色显示,脂多糖1组Caspase-1表达较对照1组明显增加;脂多糖2组Caspase-1表达较脂多糖1组明显增加。免疫荧光染色显示,脂多糖1组NLRP3表达较对照1组明显增加;脂多糖2组NLRP3表达较脂多糖1组明显增加。蛋白免疫印迹结果显示,与对照1组比较,脂多糖1组NLRP3、ASC表达明显上调,Bcl-2表达明显下调(P<0.05);与脂多糖1组比较,脂多糖2组NLRP3、ASC表达明显上调,Bcl-2表达明显下调(P<0.05)。RT-PCR结果显示,与对照1组比较,脂多糖1组IL-1β、IL-18 mRNA表达明显升高(P<0.05);与脂多糖1组比较,脂多糖2组IL-1β、IL-18 mRNA表达明显升高(2.45±0.27 vs 1.81±0.15,2.54±0.24 vs 1.82±0.19,P<0.05)。结论HMGA1可以加重脂多糖诱导的脓毒症心肌病小鼠心肌细胞焦亡,通过上调Caspase-1依赖性途径加重细胞焦亡,通过下调抗凋亡蛋白Bcl-2加重细胞凋亡。
基金supported by National Natural Science Foundation of China(81371210)Qing Lan Project of Jiangsu Province(2014)Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘OBJECTIVE To investigate the neuroprotective effects of quercetin on central neurons against chronic high glucose in central neurons,in relation to Nrf2/ARE/Glo-1 activation.METHODS SH-SY5Y cells were cultured with high glucose(HG,70 mmol·L^(-1)),4-fold of the normal glucose(17.5 mmol·L^(-1)).Quercetin was set three concentrations(5,10,20μmol·L^(-1)),with Nrf2 activator sulforaphane(SFN)as a positive group(2.5μmol·L^(-1)).After 72 h,cells were collected for glyoxalase 1(Glo-1)activity and GSH level were by spectrophotometry;advanced glycation end-products(AGEs)as well as nuclear Nrf2 and p-Nrf2 levels by immunofluorescence;Glo-1,γ-glutamycysteine synthase(γ-GCS),Nrf2 and p-Nrf2 protein levels by Western blotting,and Glo-1 andγ-GCS m RNA levels by real-time qP CR.RESULTS Quercetin increased the cell viability of SH-SY5Y cells,and upregulated the levels of Glo-1 activity,protein,and m RNA in SH-SY5Y cells cultured with HG,accompanied by the elevated levels of glutathione,a cofactor of Glo-1 activity,and the reduced levels of AGEs.Meanwhile,quercetin could increase p-Nrf2 and Nrf2 levels in nucleus as well as p-Nrf2 levels in cytosol of SH-SY5Y cells exposed to chronic HG,accompanied by the elevated protein expression and m RNA levels ofγ-GCS,a known target gene of Nrf2/ARE signaling.Moreover,a PKC activator or a p38MAPK inhibitor pretreatment could significantly increase the protein expression ofγ-GCS in HG condition,but an alkylating agent for sulfydryl of cysteine in Keap 1,a negative regulator of Nrf2,pretreatment only showed an increased tendency ofγ-GCS protein,compared with without pretreatment;however,after pretreatment with those tool drugs,co-treatment with quercetin and HG had similar results to those of single tool drug pretreatment followed by HG exposure.CONCLUSION Firstly,quercetin can enhance Glo-1 function in central neurons,which is mediated by activation of Nrf2/ARE pathway,then exerts the neuroprotection against HG induced damage;moreover,PKC and p38 MAPK pathways may be involved in Nrf2 inactivation in chronic HG condition.
