目的通过研究重组人胰高糖素样多肽-1(rh GLP-1)对人肝细胞系HL-7702胰岛素信号通路关键位点Akt表达的影响,揭示GLP-1对肝细胞胰岛素信号通路PI3K-AKT-m TORC的作用。方法选用处于对数生长期的人肝细胞系HL-7702,分别在含有不同浓度rh G...目的通过研究重组人胰高糖素样多肽-1(rh GLP-1)对人肝细胞系HL-7702胰岛素信号通路关键位点Akt表达的影响,揭示GLP-1对肝细胞胰岛素信号通路PI3K-AKT-m TORC的作用。方法选用处于对数生长期的人肝细胞系HL-7702,分别在含有不同浓度rh GLP-1(7-36)(10 n M、100 n M、1000 n M)的培养液中培养24 h,以空白培养液作为对照。用蛋白质免疫印迹法(western blot)检测Akt蛋白及磷酸化Akt(p-Akt)蛋白的表达量。结果 Akt蛋白的表达水平在对照组与GLP-1低浓度组、GLP-1中浓度组、GLP-1高浓度组均无明显差异。与对照组相比,p-Akt(Thr308)的表达量在GLP-1低浓度组(0.60±0.27 vs 1±0,P<0.05)、GLP-1中浓度组(0.61±0.18 vs 1±0,P<0.05)、GLP-1高浓度组(0.54±0.15 vs 1±0,P<0.01)明显下降;p-Akt(Ser473)的表达量在对照组与GLP-1不同浓度组之间均没有差异。结论 GLP-1导致人肝细胞p-Akt的表达水平下降,提示GLP-1对肝细胞PI3K-AKT-m TORC通路可能具有抑制作用,这可能是GLP-1类降糖药物降低血脂的机制之一。展开更多
Glucagon-like peptide- 1 （GLP- 1） has been endorsed as a promising and attractive agent in the treatment of type 2 diabetes mellitus （T2DM）. Both Alzheimer＇s disease （AD） and T2DM share some common pathophysiol...Glucagon-like peptide- 1 （GLP- 1） has been endorsed as a promising and attractive agent in the treatment of type 2 diabetes mellitus （T2DM）. Both Alzheimer＇s disease （AD） and T2DM share some common pathophysiologic hallmarks, such as amyloid β （Aβ）, phosphoralation of tau protein, and glycogen synthase kinase-3. GLP-1 possesses neurotropic properties and can reduce amyloid protein levels in the brain. Based on extensive studies during the past decades, the understanding on AD leads us to believe that the primary targets in AD are the Aβ and tau protein. Combine these findings, GLP- 1 is probably a promising agent in the therapy of AD. This review was focused on the biochemistry and physiology of GLP- 1, communities between T2DM and AD, new progresses of GLP - 1 in treating T2MD and improving some pathologic hanmarks of AD.展开更多
Pancreatic cells express the proglucagon gene （ gcg ） and thereby produce the peptide hormone glucagon , which stimulates hepa tic glucose production and thereby increases blood glucose levels. The same gcg gene is...Pancreatic cells express the proglucagon gene （ gcg ） and thereby produce the peptide hormone glucagon , which stimulates hepa tic glucose production and thereby increases blood glucose levels. The same gcg gene is also expressed in the intesti nal endocrine L cells and certain neural cells in the brain. In the gut, gcg expression leads to the production of glucagon-like peptide-1 （GLP-1）. This incretin hormone stimulates insulin secretion when blood glucose, level is high. In addition, GLP-1 stimulates pancreatic cell proliferation, inhibits cell apoptosis, and has been utilized in the trans-differentiation of insulin producing cells.展开更多
文摘目的通过研究重组人胰高糖素样多肽-1(rh GLP-1)对人肝细胞系HL-7702胰岛素信号通路关键位点Akt表达的影响,揭示GLP-1对肝细胞胰岛素信号通路PI3K-AKT-m TORC的作用。方法选用处于对数生长期的人肝细胞系HL-7702,分别在含有不同浓度rh GLP-1(7-36)(10 n M、100 n M、1000 n M)的培养液中培养24 h,以空白培养液作为对照。用蛋白质免疫印迹法(western blot)检测Akt蛋白及磷酸化Akt(p-Akt)蛋白的表达量。结果 Akt蛋白的表达水平在对照组与GLP-1低浓度组、GLP-1中浓度组、GLP-1高浓度组均无明显差异。与对照组相比,p-Akt(Thr308)的表达量在GLP-1低浓度组(0.60±0.27 vs 1±0,P<0.05)、GLP-1中浓度组(0.61±0.18 vs 1±0,P<0.05)、GLP-1高浓度组(0.54±0.15 vs 1±0,P<0.01)明显下降;p-Akt(Ser473)的表达量在对照组与GLP-1不同浓度组之间均没有差异。结论 GLP-1导致人肝细胞p-Akt的表达水平下降,提示GLP-1对肝细胞PI3K-AKT-m TORC通路可能具有抑制作用,这可能是GLP-1类降糖药物降低血脂的机制之一。
文摘Glucagon-like peptide- 1 （GLP- 1） has been endorsed as a promising and attractive agent in the treatment of type 2 diabetes mellitus （T2DM）. Both Alzheimer＇s disease （AD） and T2DM share some common pathophysiologic hallmarks, such as amyloid β （Aβ）, phosphoralation of tau protein, and glycogen synthase kinase-3. GLP-1 possesses neurotropic properties and can reduce amyloid protein levels in the brain. Based on extensive studies during the past decades, the understanding on AD leads us to believe that the primary targets in AD are the Aβ and tau protein. Combine these findings, GLP- 1 is probably a promising agent in the therapy of AD. This review was focused on the biochemistry and physiology of GLP- 1, communities between T2DM and AD, new progresses of GLP - 1 in treating T2MD and improving some pathologic hanmarks of AD.
基金Canadian Institutes of Health Research(CIHR,MOP-89987)Canadian Diabetes Association(CDA,2341)for providing funding support in conducting his current research on this topic.
文摘Pancreatic cells express the proglucagon gene （ gcg ） and thereby produce the peptide hormone glucagon , which stimulates hepa tic glucose production and thereby increases blood glucose levels. The same gcg gene is also expressed in the intesti nal endocrine L cells and certain neural cells in the brain. In the gut, gcg expression leads to the production of glucagon-like peptide-1 （GLP-1）. This incretin hormone stimulates insulin secretion when blood glucose, level is high. In addition, GLP-1 stimulates pancreatic cell proliferation, inhibits cell apoptosis, and has been utilized in the trans-differentiation of insulin producing cells.
