Non-enzymatic glycation reaction in food can produce diet-derived advanced glycation end products(dAGEs),which have potential health risks.Thus,it is of great significance to find efficient substances to improve the n...Non-enzymatic glycation reaction in food can produce diet-derived advanced glycation end products(dAGEs),which have potential health risks.Thus,it is of great significance to find efficient substances to improve the negative effects induced by dAGEs on human health.This study investigated the intervening effects of peanut skin procyanidins(PSP)on the dAGEs-induced oxidative stress and systemic inflammation in experimental mice model.Results showed that the accumulation of AGEs in serum,liver,and kidney was significantly increased after mice were fed dAGEs(P<0.05).The expression of advanced glycation product receptor(RAGE)was also significantly increased in liver and kidney(P<0.05).PSP could not only effectively reduce the accumulation of AGEs in serum,liver and kidney of mice,but also reduce the expression of RAGE in liver and kidney of mice.And the levels of pro-inflammatory cytokines interleukin-6(IL-6),tumor necrosis factor(TNF-α),and IL-1βin serum of mice were significantly decreased(P<0.05),while the levels of antiinflammatory factor IL-10 were increased,and the inflammatory injury in mice was improved.In addition,the levels of superoxide dismutase(SOD),glutathione(GSH),catalase(CAT)in liver and kidney of mice were increased(P<0.05),and the level of malondialdehyde(MDA)was decreased(P<0.05),which enhanced the antioxidant capacity of mice in vivo,and improved the oxidative damage of liver and kidney.Molecular docking technique was used to confirm that the parent compound of procyanidins and its main metabolites,such as 3-hydroxyphenylacetic acid,could interact with RAGE,which might inhibit the activation of nuclear transcription factor(NF-κB),and ultimately reduce oxidative stress and inflammation in mice.展开更多
Objective： To investigate the effects of rosiglitazone, a synthetic ligand of peroxisome proliferators-activated receptor gamma （PPARγ）, on the expression of acyl-coenzyme A： cholesterol acyltransferase-1 （ACAT-...Objective： To investigate the effects of rosiglitazone, a synthetic ligand of peroxisome proliferators-activated receptor gamma （PPARγ）, on the expression of acyl-coenzyme A： cholesterol acyltransferase-1 （ACAT-1） in phorbol myristate acetate （PMA）-pretreated THP-1 cells after the inducement of advanced glycation end products （AGEs）. Methods： After THP-1 cells were cultured in the presence of 0.1 μmol/L PMA for 72 h to induce phagocytic differentiation, the obtained THP-1 macrophages were treated with rosiglitazone for 4 h at different concentrations （1, 5 or 10 μmol/L） and then exposed to AGEs-modified bovine serum albumin （AGEs-BSA） for 24 h at a concentration of 200 mg/L. Reverse transcription polymerase chain reaction （RT-PCR） and Western blot analysis were performed to detect the mRNA and protein expressions of ACAT-1 respectively. Results： Administration of AGEs-BSA （200 mg/L） into the THP-1 macrophages resulted in up-regulation of ACAT-1 at mRNA and protein levels when compared with the expressions in macrophages incubated with serum-free RPMI1640. Pretreatment of rosiglitazone inhibited significantly the increased expression of ACAT-1 induced by AGEs-BSA in a concentration-dependent manner. Conclusion： PPARy activation by rosiglitazone down-regulates ACAT-1 expression induced by AGEs in THP-1 macrophages, which might provide a new way for treating atherogenesis in diabetic patients.展开更多
Tea as the most consumed beverage in the world has received enormous attention for its promoting health benefits.The deleterious effect ofα-dicarbonyls and AGEs formed in Maillard reaction is also a longterm challeng...Tea as the most consumed beverage in the world has received enormous attention for its promoting health benefits.The deleterious effect ofα-dicarbonyls and AGEs formed in Maillard reaction is also a longterm challenge.The connection between the two topics was the main aim of this review,to address and update the antiglycation effect and mechanism of tea and tea polyphenols.By analyzing recent publications,we have covered across chemistry models,cell lines and animal studies.Tea polyphenols,particularly catechins,showed outstanding antiglycation effect by trappingα-dicarbonyl compounds and impeding AGEs formation.Reduction of carbonyl stress brought alleviation to aging,diabetes,and collagen related diseases or complications through regulation of RAGE expression and subsequent MAPK and TGF-βpathway.Therefore,tea polyphenols can serve as promising natural candidates in the treatment and/or prevention of nephropathy,retinopathy,hepatopathy,hyperglycemia and obesity among others,by their potent antiglycation effect.Further studies need to address on aspects like exact mechanisms,solution of detection obstacles,balance of practical usage and harmful effects such as potential flavor damage and toxicity in food,to gain a comprehensive understanding of antiglycation activities of tea polyphenols and its actual application.展开更多
Objective To investigate the effects of hepatocyte growth factor(HGF)on vascular endothelial cells apoptosis induced by advanced glycation end products(AGEs)and its possible mechanism. Methods Human umbilical vein end...Objective To investigate the effects of hepatocyte growth factor(HGF)on vascular endothelial cells apoptosis induced by advanced glycation end products(AGEs)and its possible mechanism. Methods Human umbilical vein endothelial cells(HUVECs)were cultured in vitro and intervened by different concentrations of AGEs and HGF.The cell inhibitory rates of each group with different culture time(12, 24, 48, and 72 hours)were measured by methyl thiazolyl tetrazolium(MTT)assay. The early stage apoptosis was detected by flow cytometry with Annexin V-FITC/PI double staining, morphology of cell apoptosis was observed by hoechst 33258 fluorescence staining, and the expression of apoptosis-associated genes Bax and Bcl-2 were determined by Western blotting.The activity of caspase-3 was detected by enzyme-linked immunosorbent assay (ELISA).Results Morphological observation indicated that high concentration of AGEs induced characteristic apoptotic changes in HUVECs.Within a certain concentration range, HUVECs apoptosis inducing rates by AGEs were in both dose- and time-dependent manners.HGF significantly inhibited the apoptosis of HUVECs induced by AGEs (P< 0.05).AGEs significantly promoted expression of Bax protein, but not Bcl-2.Whereas HGF significantly promoted the expression of Bcl-2(P<0.01)and decreased the activity of caspase-3(P<0.05)without affecting Bax level.Conclusions AGEs can induce the apoptosis of endothelial cells in vitro.HGF may effectively attenuate AGEs-induced endothelial cells apoptosis through upregulating Bcl-2 gene expression and inhibiting caspase-3 activation.展开更多
Investigation that protein oxidation to the formation of advanced glycation end products(AGEs)after chicken myofibrillar protein glycation is limited.Models of protein oxidation induced by different concentrations of ...Investigation that protein oxidation to the formation of advanced glycation end products(AGEs)after chicken myofibrillar protein glycation is limited.Models of protein oxidation induced by different concentrations of hydroxyl radicals(·OH)were developed after the chicken myofibrillar protein mild glycation(MPG).Results exhibited that levels of AGEs and surface hydrophobicity(H_(0))steadily increased with the a ddition of h ydrogen peroxide(H_(2)O_(2))concentration.However,levels of s ulfhydryl group,free amino group,and particle size gradually decreased with the H_(2)O_(2)concentration.The protein carbonyl value increased in H_(2)O_(2)concentration until 10 mmol/L.Pearson's correlation indicated that MPG structure modification(unfolding and degradation)induced by protein oxidation were significantly positively correlated with AGEs concentration(P<0.05).Finally,a mechanism was proposed to hypothesize t he effect of protein oxidation on the formation of AGEs under MPG conditions.展开更多
Advanced glycation end products(AGE) are potential harmful substances formed in the advanced Maillard reaction and increasingly investigated in muscle foods. However, the contribution of oxidation to the AGE formation...Advanced glycation end products(AGE) are potential harmful substances formed in the advanced Maillard reaction and increasingly investigated in muscle foods. However, the contribution of oxidation to the AGE formation is controversial. Moreover, reports on glyoxal(GO) induced AGE formation in chicken meat emulsion(CME) are limited. Thus, the effects of GO on emulsifying properties, rheological behavior and AGE formation in CME were investigated. Our findings exhibited that levels of Nε-carboxymethyllysine(CML) and Nε-carboxyethyllysine(CEL) were associated with lipid oxidation but not significantly(P > 0.05). Levels of AGE peaked when GO concentration ranged from 5 mmol/L(CML) to 10 mmol/L(CEL). The droplets’ aggregation associated with the disulfide bond when the concentration of GO was at 0.5–30 mmol/L while non-disulfide bond association occurred at 30–50 mmol/L GO concentration. In conclusion, compared to the effect of oxidation, GO exhibited the main role in the AGE formation of CME. This study will provide theoretical significance for further understanding and controlling the formation of AGE in CME.展开更多
Maillard reaction(MR)is a non-enzymatic browning reaction commonly seen in food processing,which occurs between reducing sugars and compounds with amino groups.Despite certain advantages based on Maillard reaction pro...Maillard reaction(MR)is a non-enzymatic browning reaction commonly seen in food processing,which occurs between reducing sugars and compounds with amino groups.Despite certain advantages based on Maillard reaction products(MRPs)found in some food for health and storage application have appeared,however,the MR occurring in human physiological environment can produce advanced glycation end products(AGEs)by non-enzymatic modification of macromolecules such as proteins,lipids and nucleic acid,which could change the structure and functional activity of the molecules themselves.In this review,we take AGEs as our main object,on the one hand,discuss physiologic aging,that is,age-dependent covalent cross-linking and modification of proteins such as collagen that occur in eyes and skin containing connective tissue.On the other hand,pathological aging associated with autoimmune and inflammatory diseases,neurodegenerative diseases,diabetes and diabetic nephropathy,cardiovascular diseases and bone degenerative diseases have been mainly proposed.Based on the series of adverse effects of accelerated aging and disease pathologies caused by MRPs,the possible harm caused by some MR can be slowed down or inhibited by artificial drug intervention,dietary pattern and lifestyle control.It also stimulates people's curiosity to continue to explore the potential link between the MR and human aging and health,which should be paid more attention to for the development of life sciences.展开更多
Soluble receptor for advanced glycation end products(sRAGE)acts as a decoy sequestering of RAGE ligands,thus preventing the activation of the ligand-RAGE axis linking human diseases.However,the molecular mechanisms un...Soluble receptor for advanced glycation end products(sRAGE)acts as a decoy sequestering of RAGE ligands,thus preventing the activation of the ligand-RAGE axis linking human diseases.However,the molecular mechanisms underlying sRAGE remain unclear.In this study,THP-1 monocytes were cultured in normal glucose(NG,5.5 mmol/L)and high glucose(HG,15 mmol/L)to investigate the effects of diabetesrelevant glucose concentrations on sRAGE and interleukin-1β(IL-1β)secretion.The modulatory effects of epigallocatechin gallate(EGCG)in response to HG challenge were also evaluated.HG enhanced intracellular reactive oxygen species(ROS)generation and RAGE expression.The secretion of sRAGE,including esRAGE and cRAGE,was reduced under HG conditions,together with the downregulation of a disintegrin and metallopeptidase 10(ADAM10)and nuclear factor erythroid 2-related factor 2(Nrf2)nuclear translocation.Mechanistically,the HG effects were counteracted by siRAGE and exacerbated by siNrf2.Chromatin immunoprecipitation results showed that Nrf2 binding to the ADAM10 promoter and HG interfered with this binding.Our data reinforce the notion that RAGE and Nrf2 might be sRAGE-regulating factors.Under HG conditions,the treatment of EGCG reduced ROS generation and RAGE activation.EGCG-stimulated cRAGE release was likely caused by the upregulation of the Nrf2-ADAM10 pathway.EGCG inhibited HG-mediated NLRP3 inflammasome activation at least partly by stimulating sRAGE,thereby reducing IL-1βrelease.展开更多
以冷冻鱼糜为原料制作鱼饼,用棕榈油和高油酸菜籽油对鱼饼进行炸制,在炸制鱼饼的过程中,鱼饼的理化性质会发生一系列的变化。该实验的目的是探究在炸制过程中鱼饼中晚期糖基化终末产物(advanced glycation end products,AGEs)的生成与...以冷冻鱼糜为原料制作鱼饼,用棕榈油和高油酸菜籽油对鱼饼进行炸制,在炸制鱼饼的过程中,鱼饼的理化性质会发生一系列的变化。该实验的目的是探究在炸制过程中鱼饼中晚期糖基化终末产物(advanced glycation end products,AGEs)的生成与鱼饼的理化指标以及油脂氧化程度之间的关系。研究发现,两种油炸制鱼饼后,红度值和黄度值均升高,并且两种油炸制的鱼饼的水分含量都是外层低于内层,而脂肪含量都是外层高于内层,鱼饼的丙二醛含量都是外层高于内层。两种油炸制的鱼饼中荧光和非荧光AGEs含量在炸制的第9 h较高,且棕榈油>高油酸菜籽油,表明炸制鱼饼中AGEs含量并不随油脂不饱和度的增加而增加。展开更多
目的通过观察替米沙坦对晚期糖基化终末产物(AGEs)诱导的人脐静脉内皮细胞表达血管细胞黏附因子-1(VCAM-1)和单核细胞趋化蛋白-1(MCP-1)的影响,研究替米沙坦对AGEs所致动脉粥样硬化(AS)的干预作用和机制。方法采用胶原酶消化法获取人脐...目的通过观察替米沙坦对晚期糖基化终末产物(AGEs)诱导的人脐静脉内皮细胞表达血管细胞黏附因子-1(VCAM-1)和单核细胞趋化蛋白-1(MCP-1)的影响,研究替米沙坦对AGEs所致动脉粥样硬化(AS)的干预作用和机制。方法采用胶原酶消化法获取人脐静脉内皮细胞,分为4组:空白对照组,牛血清白蛋白(BSA)对照组,AGEs诱导组(10-4~10-1mg/m L),AGEs+替米沙坦组(1、10、100 nmol/L)。活性氧检测试剂盒检测及倒置荧光显微镜观察细胞内活性氧含量,RT-PCR检测VCAM-1、MCP-1及晚期糖基化终末产物受体(RAGE)的mRNA。结果 AGEs组人内皮细胞内活性氧荧光强度增强,替米沙坦干预后降低;AGEs呈浓度依赖性地增强人内皮细胞对VCAM-1和MCP-1基因的转录,与空白对照组相比,AGEs(10-4mg/m L)组VCAM-1和MCP-1 mRNA表达水平显著增高(0.24±0.01 vs 0.07±0.02;0.25±0.01 vs 0.18±0.03,P<0.05);替米沙坦呈浓度依赖性地抑制人内皮细胞对VCAM-1和MCP-1基因的转录,与AGEs诱导组相比,替米沙坦(10 nmol/L)组人内皮细胞的VCAM-1和MCP-1基因转录水平显著降低(0.23±0.01 vs 0.85±0.11;0.62±0.10 vs 1.05±0.04,P<0.05);与AGEs诱导组相比,替米沙坦(1 nmol/L)组人内皮细胞RAGE基因表达水平显著降低(0.64±0.03 vs 1.18±0.10,P<0.05)。结论 AGEs增强人内皮细胞表达VCAM-1和MCP-1;替米沙坦可能通过抑制RAGE表达来抑制AGEs诱导的人内皮炎性损伤。展开更多
晚期糖基化终末产物(advanced glycation end products,AGEs)是在美拉德反应末期,蛋白质、氨基酸、脂类或核酸等的游离氨基与还原糖(葡萄糖、果糖、戊糖等)的羰基进行反应后产生的一类稳定产物。AGEs可以与AGE受体(receptor for advance...晚期糖基化终末产物(advanced glycation end products,AGEs)是在美拉德反应末期,蛋白质、氨基酸、脂类或核酸等的游离氨基与还原糖(葡萄糖、果糖、戊糖等)的羰基进行反应后产生的一类稳定产物。AGEs可以与AGE受体(receptor for advanced glycation end product,RAGE)相互作用,启动其下游的相关信号通路从而诱导氧化应激和炎症反应。植物多酚能抑制AGEs诱导的RAGE上调,抑制核转录因子(nuclear factor kappa B,NF-κB)磷酸化和丝裂原活化蛋白激酶(mitogen-activated protein kinases,MAPKs)的活化,并显著降低炎症介质的基因表达,包括肿瘤坏死因子-α(tumor necrosis factor-alpha,TNF-α)、白细胞介素-1β(interleukin-1β,IL-1β)和IL-6等。基于此,本文全面综述了植物多酚通过RAGE/MAPK/NF-κB信号通路调节AGEs诱导的炎症因子基因表达的作用机制,以期为研发植物多酚类抗氧化和抗炎保健食品或药品提供一定的科学依据。展开更多
基金supported by the Doctoral Science Foundation of Shanxi Agricultural University(2023BQ34)Shanxi Province Work Award Fund Research Project(SXBYKY2022116).
文摘Non-enzymatic glycation reaction in food can produce diet-derived advanced glycation end products(dAGEs),which have potential health risks.Thus,it is of great significance to find efficient substances to improve the negative effects induced by dAGEs on human health.This study investigated the intervening effects of peanut skin procyanidins(PSP)on the dAGEs-induced oxidative stress and systemic inflammation in experimental mice model.Results showed that the accumulation of AGEs in serum,liver,and kidney was significantly increased after mice were fed dAGEs(P<0.05).The expression of advanced glycation product receptor(RAGE)was also significantly increased in liver and kidney(P<0.05).PSP could not only effectively reduce the accumulation of AGEs in serum,liver and kidney of mice,but also reduce the expression of RAGE in liver and kidney of mice.And the levels of pro-inflammatory cytokines interleukin-6(IL-6),tumor necrosis factor(TNF-α),and IL-1βin serum of mice were significantly decreased(P<0.05),while the levels of antiinflammatory factor IL-10 were increased,and the inflammatory injury in mice was improved.In addition,the levels of superoxide dismutase(SOD),glutathione(GSH),catalase(CAT)in liver and kidney of mice were increased(P<0.05),and the level of malondialdehyde(MDA)was decreased(P<0.05),which enhanced the antioxidant capacity of mice in vivo,and improved the oxidative damage of liver and kidney.Molecular docking technique was used to confirm that the parent compound of procyanidins and its main metabolites,such as 3-hydroxyphenylacetic acid,could interact with RAGE,which might inhibit the activation of nuclear transcription factor(NF-κB),and ultimately reduce oxidative stress and inflammation in mice.
文摘Objective： To investigate the effects of rosiglitazone, a synthetic ligand of peroxisome proliferators-activated receptor gamma （PPARγ）, on the expression of acyl-coenzyme A： cholesterol acyltransferase-1 （ACAT-1） in phorbol myristate acetate （PMA）-pretreated THP-1 cells after the inducement of advanced glycation end products （AGEs）. Methods： After THP-1 cells were cultured in the presence of 0.1 μmol/L PMA for 72 h to induce phagocytic differentiation, the obtained THP-1 macrophages were treated with rosiglitazone for 4 h at different concentrations （1, 5 or 10 μmol/L） and then exposed to AGEs-modified bovine serum albumin （AGEs-BSA） for 24 h at a concentration of 200 mg/L. Reverse transcription polymerase chain reaction （RT-PCR） and Western blot analysis were performed to detect the mRNA and protein expressions of ACAT-1 respectively. Results： Administration of AGEs-BSA （200 mg/L） into the THP-1 macrophages resulted in up-regulation of ACAT-1 at mRNA and protein levels when compared with the expressions in macrophages incubated with serum-free RPMI1640. Pretreatment of rosiglitazone inhibited significantly the increased expression of ACAT-1 induced by AGEs-BSA in a concentration-dependent manner. Conclusion： PPARy activation by rosiglitazone down-regulates ACAT-1 expression induced by AGEs in THP-1 macrophages, which might provide a new way for treating atherogenesis in diabetic patients.
基金funded by Hubei Science and Technology Plan Key Project(G2019ABA100)。
文摘Tea as the most consumed beverage in the world has received enormous attention for its promoting health benefits.The deleterious effect ofα-dicarbonyls and AGEs formed in Maillard reaction is also a longterm challenge.The connection between the two topics was the main aim of this review,to address and update the antiglycation effect and mechanism of tea and tea polyphenols.By analyzing recent publications,we have covered across chemistry models,cell lines and animal studies.Tea polyphenols,particularly catechins,showed outstanding antiglycation effect by trappingα-dicarbonyl compounds and impeding AGEs formation.Reduction of carbonyl stress brought alleviation to aging,diabetes,and collagen related diseases or complications through regulation of RAGE expression and subsequent MAPK and TGF-βpathway.Therefore,tea polyphenols can serve as promising natural candidates in the treatment and/or prevention of nephropathy,retinopathy,hepatopathy,hyperglycemia and obesity among others,by their potent antiglycation effect.Further studies need to address on aspects like exact mechanisms,solution of detection obstacles,balance of practical usage and harmful effects such as potential flavor damage and toxicity in food,to gain a comprehensive understanding of antiglycation activities of tea polyphenols and its actual application.
文摘Objective To investigate the effects of hepatocyte growth factor(HGF)on vascular endothelial cells apoptosis induced by advanced glycation end products(AGEs)and its possible mechanism. Methods Human umbilical vein endothelial cells(HUVECs)were cultured in vitro and intervened by different concentrations of AGEs and HGF.The cell inhibitory rates of each group with different culture time(12, 24, 48, and 72 hours)were measured by methyl thiazolyl tetrazolium(MTT)assay. The early stage apoptosis was detected by flow cytometry with Annexin V-FITC/PI double staining, morphology of cell apoptosis was observed by hoechst 33258 fluorescence staining, and the expression of apoptosis-associated genes Bax and Bcl-2 were determined by Western blotting.The activity of caspase-3 was detected by enzyme-linked immunosorbent assay (ELISA).Results Morphological observation indicated that high concentration of AGEs induced characteristic apoptotic changes in HUVECs.Within a certain concentration range, HUVECs apoptosis inducing rates by AGEs were in both dose- and time-dependent manners.HGF significantly inhibited the apoptosis of HUVECs induced by AGEs (P< 0.05).AGEs significantly promoted expression of Bax protein, but not Bcl-2.Whereas HGF significantly promoted the expression of Bcl-2(P<0.01)and decreased the activity of caspase-3(P<0.05)without affecting Bax level.Conclusions AGEs can induce the apoptosis of endothelial cells in vitro.HGF may effectively attenuate AGEs-induced endothelial cells apoptosis through upregulating Bcl-2 gene expression and inhibiting caspase-3 activation.
基金supported by National Key R&D Program of China(2021YFD2100104)griculture Research System of China(CARS-41-Z)+2 种基金Science and Technology Project of Nanjing City(202002040)Jiangsu Province Policy Guidance Program(BX2020008)Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX21_0579),China。
文摘Investigation that protein oxidation to the formation of advanced glycation end products(AGEs)after chicken myofibrillar protein glycation is limited.Models of protein oxidation induced by different concentrations of hydroxyl radicals(·OH)were developed after the chicken myofibrillar protein mild glycation(MPG).Results exhibited that levels of AGEs and surface hydrophobicity(H_(0))steadily increased with the a ddition of h ydrogen peroxide(H_(2)O_(2))concentration.However,levels of s ulfhydryl group,free amino group,and particle size gradually decreased with the H_(2)O_(2)concentration.The protein carbonyl value increased in H_(2)O_(2)concentration until 10 mmol/L.Pearson's correlation indicated that MPG structure modification(unfolding and degradation)induced by protein oxidation were significantly positively correlated with AGEs concentration(P<0.05).Finally,a mechanism was proposed to hypothesize t he effect of protein oxidation on the formation of AGEs under MPG conditions.
基金supported by Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX21_0579)the China Scholarship Council(No.202006850022)+1 种基金supported by Agriculture Research System of China(CARS-41-Z)Science and Technology Project of Nanjing City(No.202002040)。
文摘Advanced glycation end products(AGE) are potential harmful substances formed in the advanced Maillard reaction and increasingly investigated in muscle foods. However, the contribution of oxidation to the AGE formation is controversial. Moreover, reports on glyoxal(GO) induced AGE formation in chicken meat emulsion(CME) are limited. Thus, the effects of GO on emulsifying properties, rheological behavior and AGE formation in CME were investigated. Our findings exhibited that levels of Nε-carboxymethyllysine(CML) and Nε-carboxyethyllysine(CEL) were associated with lipid oxidation but not significantly(P > 0.05). Levels of AGE peaked when GO concentration ranged from 5 mmol/L(CML) to 10 mmol/L(CEL). The droplets’ aggregation associated with the disulfide bond when the concentration of GO was at 0.5–30 mmol/L while non-disulfide bond association occurred at 30–50 mmol/L GO concentration. In conclusion, compared to the effect of oxidation, GO exhibited the main role in the AGE formation of CME. This study will provide theoretical significance for further understanding and controlling the formation of AGE in CME.
基金financially supported by grants from the National Natural Science Foundation of China (82170873,81871095)the National Natural Science Foundation of China (81974503)the Tsinghua University Spring Breeze Fund (20211080005)。
文摘Maillard reaction(MR)is a non-enzymatic browning reaction commonly seen in food processing,which occurs between reducing sugars and compounds with amino groups.Despite certain advantages based on Maillard reaction products(MRPs)found in some food for health and storage application have appeared,however,the MR occurring in human physiological environment can produce advanced glycation end products(AGEs)by non-enzymatic modification of macromolecules such as proteins,lipids and nucleic acid,which could change the structure and functional activity of the molecules themselves.In this review,we take AGEs as our main object,on the one hand,discuss physiologic aging,that is,age-dependent covalent cross-linking and modification of proteins such as collagen that occur in eyes and skin containing connective tissue.On the other hand,pathological aging associated with autoimmune and inflammatory diseases,neurodegenerative diseases,diabetes and diabetic nephropathy,cardiovascular diseases and bone degenerative diseases have been mainly proposed.Based on the series of adverse effects of accelerated aging and disease pathologies caused by MRPs,the possible harm caused by some MR can be slowed down or inhibited by artificial drug intervention,dietary pattern and lifestyle control.It also stimulates people's curiosity to continue to explore the potential link between the MR and human aging and health,which should be paid more attention to for the development of life sciences.
文摘Soluble receptor for advanced glycation end products(sRAGE)acts as a decoy sequestering of RAGE ligands,thus preventing the activation of the ligand-RAGE axis linking human diseases.However,the molecular mechanisms underlying sRAGE remain unclear.In this study,THP-1 monocytes were cultured in normal glucose(NG,5.5 mmol/L)and high glucose(HG,15 mmol/L)to investigate the effects of diabetesrelevant glucose concentrations on sRAGE and interleukin-1β(IL-1β)secretion.The modulatory effects of epigallocatechin gallate(EGCG)in response to HG challenge were also evaluated.HG enhanced intracellular reactive oxygen species(ROS)generation and RAGE expression.The secretion of sRAGE,including esRAGE and cRAGE,was reduced under HG conditions,together with the downregulation of a disintegrin and metallopeptidase 10(ADAM10)and nuclear factor erythroid 2-related factor 2(Nrf2)nuclear translocation.Mechanistically,the HG effects were counteracted by siRAGE and exacerbated by siNrf2.Chromatin immunoprecipitation results showed that Nrf2 binding to the ADAM10 promoter and HG interfered with this binding.Our data reinforce the notion that RAGE and Nrf2 might be sRAGE-regulating factors.Under HG conditions,the treatment of EGCG reduced ROS generation and RAGE activation.EGCG-stimulated cRAGE release was likely caused by the upregulation of the Nrf2-ADAM10 pathway.EGCG inhibited HG-mediated NLRP3 inflammasome activation at least partly by stimulating sRAGE,thereby reducing IL-1βrelease.
文摘以冷冻鱼糜为原料制作鱼饼,用棕榈油和高油酸菜籽油对鱼饼进行炸制,在炸制鱼饼的过程中,鱼饼的理化性质会发生一系列的变化。该实验的目的是探究在炸制过程中鱼饼中晚期糖基化终末产物(advanced glycation end products,AGEs)的生成与鱼饼的理化指标以及油脂氧化程度之间的关系。研究发现,两种油炸制鱼饼后,红度值和黄度值均升高,并且两种油炸制的鱼饼的水分含量都是外层低于内层,而脂肪含量都是外层高于内层,鱼饼的丙二醛含量都是外层高于内层。两种油炸制的鱼饼中荧光和非荧光AGEs含量在炸制的第9 h较高,且棕榈油>高油酸菜籽油,表明炸制鱼饼中AGEs含量并不随油脂不饱和度的增加而增加。
文摘目的通过观察替米沙坦对晚期糖基化终末产物(AGEs)诱导的人脐静脉内皮细胞表达血管细胞黏附因子-1(VCAM-1)和单核细胞趋化蛋白-1(MCP-1)的影响,研究替米沙坦对AGEs所致动脉粥样硬化(AS)的干预作用和机制。方法采用胶原酶消化法获取人脐静脉内皮细胞,分为4组:空白对照组,牛血清白蛋白(BSA)对照组,AGEs诱导组(10-4~10-1mg/m L),AGEs+替米沙坦组(1、10、100 nmol/L)。活性氧检测试剂盒检测及倒置荧光显微镜观察细胞内活性氧含量,RT-PCR检测VCAM-1、MCP-1及晚期糖基化终末产物受体(RAGE)的mRNA。结果 AGEs组人内皮细胞内活性氧荧光强度增强,替米沙坦干预后降低;AGEs呈浓度依赖性地增强人内皮细胞对VCAM-1和MCP-1基因的转录,与空白对照组相比,AGEs(10-4mg/m L)组VCAM-1和MCP-1 mRNA表达水平显著增高(0.24±0.01 vs 0.07±0.02;0.25±0.01 vs 0.18±0.03,P<0.05);替米沙坦呈浓度依赖性地抑制人内皮细胞对VCAM-1和MCP-1基因的转录,与AGEs诱导组相比,替米沙坦(10 nmol/L)组人内皮细胞的VCAM-1和MCP-1基因转录水平显著降低(0.23±0.01 vs 0.85±0.11;0.62±0.10 vs 1.05±0.04,P<0.05);与AGEs诱导组相比,替米沙坦(1 nmol/L)组人内皮细胞RAGE基因表达水平显著降低(0.64±0.03 vs 1.18±0.10,P<0.05)。结论 AGEs增强人内皮细胞表达VCAM-1和MCP-1;替米沙坦可能通过抑制RAGE表达来抑制AGEs诱导的人内皮炎性损伤。
文摘晚期糖基化终末产物(advanced glycation end products,AGEs)是在美拉德反应末期,蛋白质、氨基酸、脂类或核酸等的游离氨基与还原糖(葡萄糖、果糖、戊糖等)的羰基进行反应后产生的一类稳定产物。AGEs可以与AGE受体(receptor for advanced glycation end product,RAGE)相互作用,启动其下游的相关信号通路从而诱导氧化应激和炎症反应。植物多酚能抑制AGEs诱导的RAGE上调,抑制核转录因子(nuclear factor kappa B,NF-κB)磷酸化和丝裂原活化蛋白激酶(mitogen-activated protein kinases,MAPKs)的活化,并显著降低炎症介质的基因表达,包括肿瘤坏死因子-α(tumor necrosis factor-alpha,TNF-α)、白细胞介素-1β(interleukin-1β,IL-1β)和IL-6等。基于此,本文全面综述了植物多酚通过RAGE/MAPK/NF-κB信号通路调节AGEs诱导的炎症因子基因表达的作用机制,以期为研发植物多酚类抗氧化和抗炎保健食品或药品提供一定的科学依据。
