丹酚酸B对缺氧复氧诱导H9c2心肌细胞损伤的保护作用机制研究

目的 观察丹酚酸B（Sal B）对H9c2心肌细胞缺氧复氧（hypoxia-reoxygenation，H/R）损伤的保护作用，并探讨其可能的作用机制。方法 首先构建H9c2心肌细胞缺氧复氧模型，采用噻唑蓝（MTT）法研究丹酚酸B与H9c2心肌细胞活力的量效关系，确定丹酚酸B的保护作用，给药方式为预给药。实验分为正常对照组、丹酚酸B组、模型组（H/R组）、H/R+丹酚酸B组，分别检测各组乳酸脱氢酶（LDH）、超氧化物歧化酶（SOD）、丙二醛（MDA）、谷胱甘肽过氧化物酶（GSH-Px）、过氧化氢酶（CAT）、活性氧簇（ROS）以及半胱氨酸天冬氨酸特异性蛋白酶-3（Caspase-3）的含量变化。Western印迹检测添加丹酚酸B对Akt磷酸化的影响，添加Akt抑制剂LY294002加以比较。结果 与正常对照组相比较，模型组LDH、MDA、ROS以及Caspase-3含量水平显著升高（P<0.05），SOD、GSH-Px以及CAT含量水平显著降低（P<0.05）；与模型组相比，丹酚酸B能够显著提高SOD、GSH-Px以及CAT含量水平（P<0.05），显著降低LDH、MDA、ROS以及Caspase-3含量水平（P<0.05）。Western印迹结果显示与正常对照组相比较，模型组Akt磷酸化水平显著降低（P<0.001），相对于模型组丹酚酸B能够显著提高Akt的磷酸化水平（P<0.01），而这种保护作用能被LY294002所阻断（P<0.01）。结论 丹酚酸B对H9c2心肌细胞缺氧复氧损伤具有保护作用，其机制可能与磷脂酰肌醇 3-激酶（PI3K/Akt）通路相关。

Protective Effect of Salvianolic Acid B on Hypoxia-Reoxygenation Induced Injury in H9c2 Cardiomyocytes

Objective To investigate the protective effect of salvianolic acid B (Sal B) on hypoxia-reoxygenation (H/R) induced injury in H9c2 cardiomyocytes. Methods The hypoxia-reoxygenation model of H9c2 cardiomyocytes was constructed. The relationship between the activity of Sal B and H9c2 was measured by MTT assay, and the protective effect of Sal B was determined. The following sets of experiments were performed: control group, Sal B group, model group (H/R group), H/R+Sal B group. The contents of lactic dehydrogenase (LDH), superoxide dismutase (SOD), malonaldehyde (MDA), glutathione peroxidase (GSH-Px), catalase (CAT), reactive oxygen species (ROS) and Caspase-3 in all groups were determined. The effect of Sal B on Akt phosphorylation was tested with Western blotting, and LY294002 added as the control. Results Compared with the control group, LDH, MDA, ROS, and Caspase-3 levels in H/R group significantly increased(P<0.05) and SOD, GSH-Px, and CAT levels in H/R group significantly decreased (P<0.05). Compared with H/R group, Sal B significantly increased SOD, GSH-Px, and CAT levels and decreased LDH, MDA, ROS, and Caspase-3 levels. Western blotting results showed that: compared with the control group, Akt phosphorylation level in model group decreased significantly(P<0.01); compared with model group, Akt phosphorylation level in Sal B group increased significantly (P<0.01), while this effect could be blocked by LY294002 (P<0.01). Conclusion Sal B shows protective effect on H9c2 cadiomyocytes injury induced by H/R, which mechanism may be related with the PI3K/Akt signaling pathway.