目的探讨腺苷酸活化蛋白激酶(AMP-activated protein kinase,AMPK)参与缺氧预处理的保护作用及机制。方法将大鼠肾上腺嗜铬细胞瘤PC12细胞分为空白对照组(Control)、单纯缺氧预处理组(Hyp)、缺氧预处理+缺氧组(Hyp+OGD)、单纯缺氧组(OGD...目的探讨腺苷酸活化蛋白激酶(AMP-activated protein kinase,AMPK)参与缺氧预处理的保护作用及机制。方法将大鼠肾上腺嗜铬细胞瘤PC12细胞分为空白对照组(Control)、单纯缺氧预处理组(Hyp)、缺氧预处理+缺氧组(Hyp+OGD)、单纯缺氧组(OGD)。通过噻唑蓝(MTT)细胞活力测定及DAPI核染色法判定细胞的损伤程度;Western Blot测定细胞内腺苷酸活化蛋白激酶α亚基(AMPKα)、磷酸化的AMPKα(P-AMPKα)及过氧化物酶体增生激活受体的共刺激因子-1α(PGC-1α)的蛋白表达水平。结果 4组间细胞活性有统计学差异(F=127,P<0.01),OGD组细胞活性减少至48%(与Control组相比,P<0.01),而Hyp+OGD组细胞的活力回升至62.5%(与OGD组相比,P<0.01)。4组细胞间三磷酸腺苷(ATP)含量有统计学差异(F=584.833,P<0.01),Hyp+OGD组ATP含量为0.114507±0.001837,较OGD组增加0.048266(P<0.01)。Hyp+OGD组和OGD组AMPKα的蛋白表达增加(与Control组相比,P<0.01)。4组间P-AMPKα、PGC-1α的表达均有统计学差异(F分别为17.496、13.421,P均<0.01),缺氧预处理及缺氧刺激均可上调2种蛋白的表达(与Control组相比,P<0.05),Hyp+OGD组较OGD组蛋白表达的增加更明显(P<0.05)。结论缺氧预处理可产生细胞保护作用,缺氧预处理后AMPK可能通过PGC-1α促进ATP的生成,进而发挥重要的细胞保护作用。展开更多
Objective:To discuss the effect of insulin and metformin on amethylation and glycolipid metabolism of peroxisome proliferator-activated receptor γ coactivator-1A(PPARGC1A) of rat offspring with gestational diabetes m...Objective:To discuss the effect of insulin and metformin on amethylation and glycolipid metabolism of peroxisome proliferator-activated receptor γ coactivator-1A(PPARGC1A) of rat offspring with gestational diabetes mellitus(GDM).Methods:A total of 45 pregnant rats received the intraperitoneal injection of streptozotocin to establish the pregnant rat model of GDM.A total of 21 pregnant rats with GDM were randomly divided into three groups,with 7ruts in each group,namely the insulin group,metformin group and control group.Rats in the insulin group received the abdominal subcutaneous injection of 1 mL/kg recombinant insulin glargine at 18:00 every day.Rats in the metformin group received the intragastric infusion of metformin hydrochloride at 18:00 every day,with the first dose of 300 mg/kg.The doses of two groups were adjusted every 3 d to maintain the blood glucose level at 2.65-7.62 mmol/L.Rats in the control group received the intragastric infusion of 1 mL normal saline at 18:00 every day.After the natural delivery of pregnant rats.10 offspring rats were randomly selected from each group.At birth,4 wk and 8 wk after the birth of offspring rats,the weight of offspring rats was measured.The blood glucose level of offspring rats was measured at 4wk and 8 wk,while the level of serum insulin,triglyceride and leptin was measured at 8 wk.Results:The weight of offspring rats at birth in the insulin group and metformin group was significantly lower than the one in the control group(P<0.05),and there was no significant difference at 4 wk and 8 wk among three groups(P>0.05).The fasting blood glucose and random blood glucose in the insulin group and metformin group at 4 wk and 8 wk were all significantly lower than ones in the control group(P<0.05);there was no significant difference between the insulin group and metformin group(P>0.05).The expression of PPARGC1 A mRNA in the insulin group and metformin group was significantly higher and the methylation level of PPARGC1 A was significantly lower than the one in the control展开更多
文摘目的探讨腺苷酸活化蛋白激酶(AMP-activated protein kinase,AMPK)参与缺氧预处理的保护作用及机制。方法将大鼠肾上腺嗜铬细胞瘤PC12细胞分为空白对照组(Control)、单纯缺氧预处理组(Hyp)、缺氧预处理+缺氧组(Hyp+OGD)、单纯缺氧组(OGD)。通过噻唑蓝(MTT)细胞活力测定及DAPI核染色法判定细胞的损伤程度;Western Blot测定细胞内腺苷酸活化蛋白激酶α亚基(AMPKα)、磷酸化的AMPKα(P-AMPKα)及过氧化物酶体增生激活受体的共刺激因子-1α(PGC-1α)的蛋白表达水平。结果 4组间细胞活性有统计学差异(F=127,P<0.01),OGD组细胞活性减少至48%(与Control组相比,P<0.01),而Hyp+OGD组细胞的活力回升至62.5%(与OGD组相比,P<0.01)。4组细胞间三磷酸腺苷(ATP)含量有统计学差异(F=584.833,P<0.01),Hyp+OGD组ATP含量为0.114507±0.001837,较OGD组增加0.048266(P<0.01)。Hyp+OGD组和OGD组AMPKα的蛋白表达增加(与Control组相比,P<0.01)。4组间P-AMPKα、PGC-1α的表达均有统计学差异(F分别为17.496、13.421,P均<0.01),缺氧预处理及缺氧刺激均可上调2种蛋白的表达(与Control组相比,P<0.05),Hyp+OGD组较OGD组蛋白表达的增加更明显(P<0.05)。结论缺氧预处理可产生细胞保护作用,缺氧预处理后AMPK可能通过PGC-1α促进ATP的生成,进而发挥重要的细胞保护作用。
基金supported by Shandong Natural Science Fund(Y2008c170)
文摘Objective:To discuss the effect of insulin and metformin on amethylation and glycolipid metabolism of peroxisome proliferator-activated receptor γ coactivator-1A(PPARGC1A) of rat offspring with gestational diabetes mellitus(GDM).Methods:A total of 45 pregnant rats received the intraperitoneal injection of streptozotocin to establish the pregnant rat model of GDM.A total of 21 pregnant rats with GDM were randomly divided into three groups,with 7ruts in each group,namely the insulin group,metformin group and control group.Rats in the insulin group received the abdominal subcutaneous injection of 1 mL/kg recombinant insulin glargine at 18:00 every day.Rats in the metformin group received the intragastric infusion of metformin hydrochloride at 18:00 every day,with the first dose of 300 mg/kg.The doses of two groups were adjusted every 3 d to maintain the blood glucose level at 2.65-7.62 mmol/L.Rats in the control group received the intragastric infusion of 1 mL normal saline at 18:00 every day.After the natural delivery of pregnant rats.10 offspring rats were randomly selected from each group.At birth,4 wk and 8 wk after the birth of offspring rats,the weight of offspring rats was measured.The blood glucose level of offspring rats was measured at 4wk and 8 wk,while the level of serum insulin,triglyceride and leptin was measured at 8 wk.Results:The weight of offspring rats at birth in the insulin group and metformin group was significantly lower than the one in the control group(P<0.05),and there was no significant difference at 4 wk and 8 wk among three groups(P>0.05).The fasting blood glucose and random blood glucose in the insulin group and metformin group at 4 wk and 8 wk were all significantly lower than ones in the control group(P<0.05);there was no significant difference between the insulin group and metformin group(P>0.05).The expression of PPARGC1 A mRNA in the insulin group and metformin group was significantly higher and the methylation level of PPARGC1 A was significantly lower than the one in the control
