洛伐他汀经P13K／Akt和ERK1／2信号通路抑制大鼠骨髓间充质干细胞凋亡  

Lovastatin protects mesenchymal stem cells against hypoxia and serum deprivation-induced apoptosis through activation of PI3K/Akt and ERK1/2 signaling pathways

作　　者：徐瑞霞[1] 陈曦[1] 胡盛寿[1] 陈静海[1] 刘学文[1] 刘学彬[1] 石林惠[1] 丛祥凤[1] 

机构地区：[1]中国医学科学院北京协和医学院心血管病研究所阜外心血管病医院卫生部心血管疾病再生医学重点实验室,100037

出　　处：《中华心血管病杂志》2008年第8期685-690,共6页Chinese Journal of Cardiology

摘　　要：目的体外以缺氧无血清条件模拟心肌梗死后的心脏缺血微环境，研究洛伐他汀能否抑制缺氧无血清引起的骨髓间充质干细胞（MSC）凋亡并探讨其机制。方法以Hoechst 33342染色荧光显微镜观察法及AnnexinV／PI流式细胞术检测洛伐他汀的抗凋亡作用，并进一步采用Western blot方法检测洛伐他汀对线粒体凋亡途径的抑制作用以及对磷脂酰肌醇3激酶（P13K）／丝氨酸苏氨酸激酶（Akt）途径和丝裂原活化的蛋白激酶（MAPK）的激酶（MEK）／细胞内信号调节蛋白激酶（ERK1／2）途径的激活作用。结果0．01～1umol／L浓度范围的洛伐他汀能够有效地抑制缺氧无血清引起的MSC凋亡。洛伐他汀抑制线粒体凋亡途径，洛伐他汀抑制细胞色素C释放，降低天冬氨酸特异性半胱氨酸蛋白酶．3（caspase-3）活化，从而保护线粒体功能。洛伐他汀的抗凋亡效应以及其抑制细胞色素C释放的作用均可被P13K抑制剂LY294002和MEK抑制剂U0126阻断。洛伐他汀能够激活P13K／Akt和MEK／ERK1／2两条细胞存活信号通路，分别导致Akt和GSK-3B及ERK1／2磷酸化。结论洛伐他汀能够抑制线粒体凋亡途径，并激活P13K／Akt和MEK／ERK1／2细胞存活通路，最终发挥抗缺氧无血清引起的MSC凋亡。该研究为提高移植干细胞的存活率提供了一种可能有效的干预措施。Objective To investigated the effect of lovastatin on hypoxia and serum deprivation （Hypoxia/SD） induced rat MSCs apoptosis in vitro and associated signaling pathway changes. Methods MSCs were isolated from Sprague-Dawley rats. The anti-apoptotic effects of lovastatin were detected using Hoechst33342 and annexin V-FITC/PI binding assay by Flow cytometric analysis. The phosphorylation of Akt and ERK1/2, the cytochrome C and the cleaved caspase-3 were detected by Western blot. Results Lovastatin （0. 01 -1 umol/L）significantly reduced Hypoxia/SD-induced MSCs apoptosis and increased Akt phosphorylation, reduced caspase-3 activation and cytochrome c release from mitochondria to cytosol in a time dependent manner. These effects could be significantly blocked by both PI3K inhibitor, LY294002 and ERK1/2 inhibitor, U0126. Conclusions Our results showed that lovastatin protects MSCs from Hypoxia/ SD-induced apoptosis via activating PI3K/Akt and ERK1/2 signaling pathways suggesting a potential role of statins as an adjunct therapeutic agent during transplanting MSCs into damaged heart after myocardial infarction.

关 键 词：骨髓祖代细胞 洛伐他汀 细胞凋亡 

分 类 号：R686[医药卫生—骨科学]