In order to explore the role of forkhead box protein O1(FoxO1)in the lipid metabolism and cell proliferation,goose primary hepatocytes were isolated and incubated with insulin or PI3K-Akt-mTOR pathway dual inhibitor N...In order to explore the role of forkhead box protein O1(FoxO1)in the lipid metabolism and cell proliferation,goose primary hepatocytes were isolated and incubated with insulin or PI3K-Akt-mTOR pathway dual inhibitor NVPBEZ235,and then transfected with FoxO1 interference plasmid.The related parameters of lipid metabolism and cell proliferation were measured.The results firstly showed that FoxO1 interference increased the intracellular TG and lipids concentration(P<0.05);and increased the proliferative index(PI),cell DNA synthesis,protein expression of Cyclin D1 in goose primary hepatocytes(P<0.05).Secondly,the co-treatment of insulin and FoxO1 interference increased the mRNA level and protein content of Cyclin D1(P<0.05);however,there was no significant difference between the insulin treatment and the co-treatment of insulin and miR-FoxO1 interference in the intracellular TG and lipids concentration and PI(P>0.05).Lastly,the decrease of intracellular TG and lipids concentration and PI induced by NVP-BEZ235 was up-regulated by FoxO1 interference significantly(P<0.05).In summary,FoxO1 could regulate the lipids metabolism and cell proliferation mediated by PI3K-Akt-mTOR signaling pathway in goose primary hepatocytes.Further investigations are required to highlight the potential role of FoxO1 in the lipid metabolism and cell proliferation mediated by insulin in goose primary hepatocyte.展开更多
Puerarin suppresses autophagy to alleviate cerebral ischemia/reperfusion injury, and accumulating evidence indicates that the AMPKm TOR signaling pathway regulates the activation of the autophagy pathway through the c...Puerarin suppresses autophagy to alleviate cerebral ischemia/reperfusion injury, and accumulating evidence indicates that the AMPKm TOR signaling pathway regulates the activation of the autophagy pathway through the coordinated phosphorylation of ULK1. In this study, we investigated the mechanisms underlying the neuroprotective effect of puerarin and its role in modulating autophagy via the AMPK-m TOR-ULK1 signaling pathway in the rat middle cerebral artery occlusion model of cerebral ischemia/reperfusion injury. Rats were intraperitoneally injected with puerarin, 50 or 100 mg/kg, daily for 7 days. Then, 30 minutes after the final administration, rats were subjected to transient middle cerebral artery occlusion for 90 minutes. Then, after 24 hours of reperfusion, the Longa score and infarct volume were evaluated in each group. Autophagosome formation was observed by transmission electron microscopy. LC3, Beclin-1 p62, AMPK, m TOR and ULK1 protein expression levels were examined by immunofluorescence and western blot assay. Puerarin substantially reduced the Longa score and infarct volume, and it lessened autophagosome formation in the hippocampal CA1 area following cerebral ischemia/reperfusion injury in a dose-dependent manner. Pretreatment with puerarin（50 or 100 mg/kg） reduced Beclin-1 expression and the LC3-II/LC3-I ratio, as well as p-AMPK and p S317-ULK1 levels. In comparison, it increased p62 expression. Furthermore, puerarin at 100 mg/kg dramatically increased the levels of p-m TOR and p S757-ULK1 in the hippocampus on the ischemic side. Our findings suggest that puerarin alleviates autophagy by activating the APMK-m TOR-ULK1 signaling pathway. Thus, puerarin might have therapeutic potential for treating cerebral ischemia/reperfusion injury.展开更多
研究黄芩清热除痹胶囊(HQC)含药血清对类风湿关节炎(RA)患者外周血单核细胞腺苷酸活化蛋白激酶(AMPK)、叉头框蛋白O3a(FoxO3a)蛋白表达的影响,探讨其抗氧化作用机制。通过收集患者和正常人外周抗凝血,用淋巴细胞分离液密度梯度离心法分...研究黄芩清热除痹胶囊(HQC)含药血清对类风湿关节炎(RA)患者外周血单核细胞腺苷酸活化蛋白激酶(AMPK)、叉头框蛋白O3a(FoxO3a)蛋白表达的影响,探讨其抗氧化作用机制。通过收集患者和正常人外周抗凝血,用淋巴细胞分离液密度梯度离心法分离出单核细胞(PBMC),细胞培养取对数期细胞,并用SD大鼠给药灌胃制备含药血清,分为5组[正常组、模型组、AMPK阻断剂组(compound C 10μmol·L^-1)、HQC中剂量+AMPK阻断剂组、HQC中剂量组],根据MTT法检测细胞抑制率。采用ELISA检测IL-1β,IL-4,LPO,MDA,SOD,TAOC水平;Western blot检测AMPK,p-AMPK,p-FoxO3a,FoxO3a蛋白的表达。结果显示,HQC含药血清对外周血人单核细胞有抑制作用,中剂量HQC为最佳浓度,24 h为最佳时间。HQC中剂量组在升高SOD,p-AMPK,p-FoxO3a,降低LPO方面优于模型组、AMPK阻断剂组、HQC中剂量+AMPK阻断剂组;在升高IL-4,TAOC,AMPK,FoxO3a,降低IL-1β,MDA方面优于模型组和AMPK阻断剂组,差异具有统计学意义(P<0.05或P<0.01)。结果表明,HQC含药血清可能通过升高TAOC,SOD水平,降低MDA,LPO水平,激活AMPK,直接磷酸化FoxO3a增强其转录活性,改善RA患者氧化应激状态。展开更多
Background and Aims:Hepatic ischemic reperfusion in-jury(IRI)occurring during surgery seriously affects patient prognosis.The specific mechanism of IRI has not been fully elucidated.The study aim was to explore the ch...Background and Aims:Hepatic ischemic reperfusion in-jury(IRI)occurring during surgery seriously affects patient prognosis.The specific mechanism of IRI has not been fully elucidated.The study aim was to explore the changes of in-flammatory environment,and the relationship of the Th17/Treg cell ratio and FOXO1 expression in hepatic IRI.Methods:Liver samples at different ischemic times were collected from patients and mice.The expression of inflammatory markers and FOXO1 in the liver was detected by western blotting and qPCR.Phenotypic changes of liver lymphocytes were analyzed by flow cytometry.The AKT/Stat3/FOXO1 pathway was veri-fied by targeting AKT with GSK2141795.The role of FOXO1 in liver inflammation and changes in lymphocyte phenotype was confirmed by upregulating FOXO1 with resveratrol.Re-sults:Prolonged ischemic time aggravates liver injury in both humans and mouse models of hepatic IRI.IR-stress caused Th17/Treg imbalance and FOXO1 down-regulation by activat-ing the AKT/Stat3/FOXO1 signaling pathway.Upregulation of FOXO1 reversed the Th17/Treg cytokine imbalance and altered the inflammation environment in the liver.Conclusions:Liver IRI induced Th17/Treg imbalance.Upregulation of FOXO1 re-versed the imbalance and alleviated liver inflammation.展开更多
Dihydromyricetin(DHM),as a bioactive flavanonol compound,is mainly found in“Tengcha”(Ampelopsis grossedentata)cultivated in south of China.This study aimed to investigate the anti-hyperglycemic and antidyslipidemic ...Dihydromyricetin(DHM),as a bioactive flavanonol compound,is mainly found in“Tengcha”(Ampelopsis grossedentata)cultivated in south of China.This study aimed to investigate the anti-hyperglycemic and antidyslipidemic activities of DHM using type 2 diabetes mellitus(T2D)rats,which was induced by feeding with high fat and fructose diet for 42 days and intraperitoneal administration of streptozocin.Forty-eight freshlyweaned rats were randomly assigned into the negative control(Blank),low dose(100 mg/kg),medium dose(200 mg/kg),high dose(400 mg/kg),and positive(40 mg/kg,met)groups.Fasting blood glucose and body weight were measured at weekly interval.Oral glucose tolerance tests were performed on days 42.The results revealed that DHM possessed significant antihyperglycaemic and antihyperinsulinemic effects.Moreover,after the DHM treatment,p-Akt and p-AMPK expression was upregulated,and glycogen synthase kinase-3β(GSK-3β)expression was downregulated,indicating that the potential anti-diabetic mechanism of DHM might be due to the regulation of the AMPK/Akt/GSK-3βsignaling pathway.展开更多
Throughout the globe,diabetes mellitus（DM） is increasing in incidence with limited therapies presently available to prevent or resolve the significant complications of this disorder.DM impacts multiple organs and af...Throughout the globe,diabetes mellitus（DM） is increasing in incidence with limited therapies presently available to prevent or resolve the significant complications of this disorder.DM impacts multiple organs and affects all components of the central and peripheral nervous systems that can range from dementia to diabetic neuropathy.The mechanistic target of rapamycin（m TOR） is a promising agent for the development of novel regenerative strategies for the treatment of DM.m TOR and its related signaling pathways impact multiple metabolic parameters that include cellular metabolic homeostasis,insulin resistance,insulin secretion,stem cell proliferation and differentiation,pancreatic β-cell function,and programmed cell death with apoptosis and autophagy.m TOR is central element for the protein complexes m TOR Complex 1（m TORC1） and m TOR Complex 2（m TORC2） and is a critical component for a number of signaling pathways that involve phosphoinositide 3-kinase（PI 3-K）,protein kinase B（Akt）,AMP activated protein kinase（AMPK）,silent mating type information regulation 2 homolog 1（Saccharomyces cerevisiae）（SIRT1）,Wnt1 inducible signaling pathway protein 1（WISP1）,and growth factors.As a result,m TOR represents an exciting target to offer new clinical avenues for the treatment of DM and the complications of this disease.Future studies directed to elucidate the delicate balance m TOR holds over cellular metabolism and the impact of its broad signaling pathways should foster the translation of these targets into effective clinical regimens for DM.展开更多
基金supported by the National Natural Science Funds of China(No.31672413)the National Waterfowl Industrial Technology System(No.CARS-43-6).
文摘In order to explore the role of forkhead box protein O1(FoxO1)in the lipid metabolism and cell proliferation,goose primary hepatocytes were isolated and incubated with insulin or PI3K-Akt-mTOR pathway dual inhibitor NVPBEZ235,and then transfected with FoxO1 interference plasmid.The related parameters of lipid metabolism and cell proliferation were measured.The results firstly showed that FoxO1 interference increased the intracellular TG and lipids concentration(P<0.05);and increased the proliferative index(PI),cell DNA synthesis,protein expression of Cyclin D1 in goose primary hepatocytes(P<0.05).Secondly,the co-treatment of insulin and FoxO1 interference increased the mRNA level and protein content of Cyclin D1(P<0.05);however,there was no significant difference between the insulin treatment and the co-treatment of insulin and miR-FoxO1 interference in the intracellular TG and lipids concentration and PI(P>0.05).Lastly,the decrease of intracellular TG and lipids concentration and PI induced by NVP-BEZ235 was up-regulated by FoxO1 interference significantly(P<0.05).In summary,FoxO1 could regulate the lipids metabolism and cell proliferation mediated by PI3K-Akt-mTOR signaling pathway in goose primary hepatocytes.Further investigations are required to highlight the potential role of FoxO1 in the lipid metabolism and cell proliferation mediated by insulin in goose primary hepatocyte.
基金supported by the National Natural Science Foundation of China,No.81202625the Open Fund of Key Laboratory of Cardiovascular and Cerebrovascular Diseases Translational Medicine,China Three Gorges University,China,No.2016xnxg101
文摘Puerarin suppresses autophagy to alleviate cerebral ischemia/reperfusion injury, and accumulating evidence indicates that the AMPKm TOR signaling pathway regulates the activation of the autophagy pathway through the coordinated phosphorylation of ULK1. In this study, we investigated the mechanisms underlying the neuroprotective effect of puerarin and its role in modulating autophagy via the AMPK-m TOR-ULK1 signaling pathway in the rat middle cerebral artery occlusion model of cerebral ischemia/reperfusion injury. Rats were intraperitoneally injected with puerarin, 50 or 100 mg/kg, daily for 7 days. Then, 30 minutes after the final administration, rats were subjected to transient middle cerebral artery occlusion for 90 minutes. Then, after 24 hours of reperfusion, the Longa score and infarct volume were evaluated in each group. Autophagosome formation was observed by transmission electron microscopy. LC3, Beclin-1 p62, AMPK, m TOR and ULK1 protein expression levels were examined by immunofluorescence and western blot assay. Puerarin substantially reduced the Longa score and infarct volume, and it lessened autophagosome formation in the hippocampal CA1 area following cerebral ischemia/reperfusion injury in a dose-dependent manner. Pretreatment with puerarin（50 or 100 mg/kg） reduced Beclin-1 expression and the LC3-II/LC3-I ratio, as well as p-AMPK and p S317-ULK1 levels. In comparison, it increased p62 expression. Furthermore, puerarin at 100 mg/kg dramatically increased the levels of p-m TOR and p S757-ULK1 in the hippocampus on the ischemic side. Our findings suggest that puerarin alleviates autophagy by activating the APMK-m TOR-ULK1 signaling pathway. Thus, puerarin might have therapeutic potential for treating cerebral ischemia/reperfusion injury.
文摘研究黄芩清热除痹胶囊(HQC)含药血清对类风湿关节炎(RA)患者外周血单核细胞腺苷酸活化蛋白激酶(AMPK)、叉头框蛋白O3a(FoxO3a)蛋白表达的影响,探讨其抗氧化作用机制。通过收集患者和正常人外周抗凝血,用淋巴细胞分离液密度梯度离心法分离出单核细胞(PBMC),细胞培养取对数期细胞,并用SD大鼠给药灌胃制备含药血清,分为5组[正常组、模型组、AMPK阻断剂组(compound C 10μmol·L^-1)、HQC中剂量+AMPK阻断剂组、HQC中剂量组],根据MTT法检测细胞抑制率。采用ELISA检测IL-1β,IL-4,LPO,MDA,SOD,TAOC水平;Western blot检测AMPK,p-AMPK,p-FoxO3a,FoxO3a蛋白的表达。结果显示,HQC含药血清对外周血人单核细胞有抑制作用,中剂量HQC为最佳浓度,24 h为最佳时间。HQC中剂量组在升高SOD,p-AMPK,p-FoxO3a,降低LPO方面优于模型组、AMPK阻断剂组、HQC中剂量+AMPK阻断剂组;在升高IL-4,TAOC,AMPK,FoxO3a,降低IL-1β,MDA方面优于模型组和AMPK阻断剂组,差异具有统计学意义(P<0.05或P<0.01)。结果表明,HQC含药血清可能通过升高TAOC,SOD水平,降低MDA,LPO水平,激活AMPK,直接磷酸化FoxO3a增强其转录活性,改善RA患者氧化应激状态。
基金the National Natural Science Foun-dation of China(82100664)the Natural Science Foundation of Jiangsu Province(BK20190114+5 种基金Jiangsu Province Postdoc-toral Research Funding Program(2021K116B)Key Project supported by Medical Science and technology development Foundation,Nanjing Department of Health(YKK19070)the Fundamental Research Funds for the Central Universi-ties(0214-YG1312037)Project of Modern Hospital Manage-ment and Development Institute,Nanjing University and Aid project of Nanjing Drum Tower Hospital Health,Education&Research Foundation(NDYG2020047)fundings for Clinical Trials from the Affiliated Drum Tower Hospital,Medical School of Nanjing University(2021-LCYJ-PY-46)the Chen Xiao-ping Foundation for the Development of Science and Technology IRIof Hubei Province,China(CXPJJH121001-2021073).
文摘Background and Aims:Hepatic ischemic reperfusion in-jury(IRI)occurring during surgery seriously affects patient prognosis.The specific mechanism of IRI has not been fully elucidated.The study aim was to explore the changes of in-flammatory environment,and the relationship of the Th17/Treg cell ratio and FOXO1 expression in hepatic IRI.Methods:Liver samples at different ischemic times were collected from patients and mice.The expression of inflammatory markers and FOXO1 in the liver was detected by western blotting and qPCR.Phenotypic changes of liver lymphocytes were analyzed by flow cytometry.The AKT/Stat3/FOXO1 pathway was veri-fied by targeting AKT with GSK2141795.The role of FOXO1 in liver inflammation and changes in lymphocyte phenotype was confirmed by upregulating FOXO1 with resveratrol.Re-sults:Prolonged ischemic time aggravates liver injury in both humans and mouse models of hepatic IRI.IR-stress caused Th17/Treg imbalance and FOXO1 down-regulation by activat-ing the AKT/Stat3/FOXO1 signaling pathway.Upregulation of FOXO1 reversed the Th17/Treg cytokine imbalance and altered the inflammation environment in the liver.Conclusions:Liver IRI induced Th17/Treg imbalance.Upregulation of FOXO1 re-versed the imbalance and alleviated liver inflammation.
基金the National Natural Science Foundation of China(NSFC,Grant No.31801459,31701520)Science and Technology General Projects of Fujian Province(2019J01393)Educational research project for young and middleaged teachers in Fujian Province(JT180116).
文摘Dihydromyricetin(DHM),as a bioactive flavanonol compound,is mainly found in“Tengcha”(Ampelopsis grossedentata)cultivated in south of China.This study aimed to investigate the anti-hyperglycemic and antidyslipidemic activities of DHM using type 2 diabetes mellitus(T2D)rats,which was induced by feeding with high fat and fructose diet for 42 days and intraperitoneal administration of streptozocin.Forty-eight freshlyweaned rats were randomly assigned into the negative control(Blank),low dose(100 mg/kg),medium dose(200 mg/kg),high dose(400 mg/kg),and positive(40 mg/kg,met)groups.Fasting blood glucose and body weight were measured at weekly interval.Oral glucose tolerance tests were performed on days 42.The results revealed that DHM possessed significant antihyperglycaemic and antihyperinsulinemic effects.Moreover,after the DHM treatment,p-Akt and p-AMPK expression was upregulated,and glycogen synthase kinase-3β(GSK-3β)expression was downregulated,indicating that the potential anti-diabetic mechanism of DHM might be due to the regulation of the AMPK/Akt/GSK-3βsignaling pathway.
基金supported by American Diabetes Association,American Heart Association,NIH NIEHS,NIH NIA,NIH NINDS,and NIH ARRA
文摘Throughout the globe,diabetes mellitus（DM） is increasing in incidence with limited therapies presently available to prevent or resolve the significant complications of this disorder.DM impacts multiple organs and affects all components of the central and peripheral nervous systems that can range from dementia to diabetic neuropathy.The mechanistic target of rapamycin（m TOR） is a promising agent for the development of novel regenerative strategies for the treatment of DM.m TOR and its related signaling pathways impact multiple metabolic parameters that include cellular metabolic homeostasis,insulin resistance,insulin secretion,stem cell proliferation and differentiation,pancreatic β-cell function,and programmed cell death with apoptosis and autophagy.m TOR is central element for the protein complexes m TOR Complex 1（m TORC1） and m TOR Complex 2（m TORC2） and is a critical component for a number of signaling pathways that involve phosphoinositide 3-kinase（PI 3-K）,protein kinase B（Akt）,AMP activated protein kinase（AMPK）,silent mating type information regulation 2 homolog 1（Saccharomyces cerevisiae）（SIRT1）,Wnt1 inducible signaling pathway protein 1（WISP1）,and growth factors.As a result,m TOR represents an exciting target to offer new clinical avenues for the treatment of DM and the complications of this disease.Future studies directed to elucidate the delicate balance m TOR holds over cellular metabolism and the impact of its broad signaling pathways should foster the translation of these targets into effective clinical regimens for DM.
