机构地区:[1]南昌大学第二附属医院内分泌代谢科江西省内分泌代谢研究所,330006
出 处:《中华内科杂志》2016年第4期311-316,共6页Chinese Journal of Internal Medicine
基 金:国家自然科学基金(81260132);江西省自然科学基金(20114BAB205088);江西省科技支撑计划重点项目(2010BSA11000)
摘 要:目的探讨胰高血糖素样肽-1(GLP-1)受体激动剂预处理对高糖培养下缺氧/复氧引起心肌细胞损伤的影响及机制。方法将离体培养的H9C2心肌细胞分为正常葡萄糖(5mmol/L,N组)、高糖(25mmol/L,G组)、高糖+利拉鲁肽预处理(100nmol/L,L组)、高糖+利拉鲁肽+wortmannin预处理(20nmol/L,W组)4组。H9C2细胞行缺氧/复氧处理。TUNEL法检测细胞凋亡,酶法测定细胞培养液一氧化氮合酶(eNOS)、一氧化氮(NO)及活性氧(ROS)水平,免疫印迹法测定磷酸化磷脂酰肌醇3-激酶(p-P13K)、磷脂酰肌醇3-激酶(P13K)、磷酸化蛋白激酶B(p-Akt)、蛋白激酶B(Akt)、Bcl-2及caspase-3蛋白表达。结果缺氧/复氧后,G组心肌细胞凋亡率高于N组[(15.79±3.92)%比(9.74±1.14)%,P=0.028],ROS水平也高于N组[(489.63±21.01)U/ml比(338.50±43.60)U/ml,P〈0.001];caspase-3表达G组高于N组(1.87±0.03比1.15±0.04,P〈0.001),而Bel-2水平G组低于N组(1.79±0.06比1.88±0.03,P=0.047);L组的凋亡率、ROS水平、caspase-3表达均低于G组,Bcl-2水平高于G组,且与G组比较,L组p-P13K/P13K(0.87±0.07比0.59±0.09,P=0.002)、p-AkVAkt(0.34±0.01比0.08±0.01,P〈0.001)、eNOS1(41.29±0.56)μmpl/L比(37.20±0.52)μmpl/L,P〈0.001]、NO[(31.24±0.40)μmpL/L比(26.66±0.53)μmpl/L,P〈0.001]水平明显升高;与L组比较,w组p-PI3K/PI3K、P-Akt/Akt、eNOS、NO及Bcl-2水平明显下降,细胞凋亡率及caspase-3水平显著升高。结论GLP-1受体激动剂利拉鲁肽可通过减少ROS产生、激活PI3K-Akt-eNOS-NO信号通路、抑制细胞凋亡,减轻高糖环境下缺氧/复氧诱导的心肌细胞损伤。Objective To investigate the effect of glucagon-like peptide-1 ( GLP-1 ) receptor agonist liraglutide on hypoxia/reoxygenation (H/R)-induced cardiomyocytes death under high glucose condition and the potential mechanisms. Methods H9C2 eardiomyocytes were divided into 4 groups : normal glucose ( N, 5 mmol/L), high glucose (G, 20 mmol/L), high glucose in combination with liraglutide (L, 100 nmol/L), high glucose in combination with liraglutide and wortmannin (W, 25 nmol/L). The apoptosis of H9C2 was detected by TUNEL assay. Nitric oxide synthetase( eNOS), nitric oxide (NO) and reactive oxygen(ROS) in supernatants were measured by enzymatic analysis, p-PI3K, PI3K, p-Akt, Akt, Bcl-2, caspase-3 were examined by western blotting. Results Compared with cells in N group, the apoptosis of H9C2 cells induced by H./R was markedly increased [(15.79 ±3.92)% vs (9.74 ±1.14)%, P=0.028] in G group. The same was true for ROS [ (489.63 ± 21.01 ) U/ml vs ( 338. 50 ± 43.60) U/ml, P 〈 0. 001 ] and caspase-3 levels ( 1.87 ±0. 03 vs 1.15 ±0. 04, P 〈 0. 001 ) , but not for Bcl-2 protein expression ( 1.79 ±0. 06 vs 1.89 ±0. 03, P=0. 047). Pretreatment of cells with liraglutide (100 nmol/L) prevented the cell death induced by high glucose and H/R together with decrease of ROS and caspase-3 levels and increase of Bcl-1 expression. Moreover, treatment of cells with liraglutide also significantly increased phosphorylation ofPI3K and Akt (p-PI3K/PI3K:0. 87±0.07 vs 0.59 ±0.09, P =0.002; p-Akt/Akt:0, 34 ±0.01 vs 0.08±0.01, P〈0.001), eNOS[ (41.29 ±0. 56) μmpl/L vs (37.20 ±0. 52) μmpl/L, P 〈0. 001 land NO [ (31.24 ±0.40) μmpl/L vs (26. 66 ± 0. 53)μmpl/L, P 〈 0. 001 ] levels. Furthermore, addition of PI3K/Akt inhibitor wortmanin markedly inhibited the expression of p-PI3K/PI3K, p-Akt/Akt, reversed the changes of eNOS, NO, caspase-3 and Bcl-2 by liraglutide, and abolished the protective effect of liraglutide on cell apoptosis. Conc
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