目的 研究西红花酸 (crocetin)对羟自由基 (OH· )损伤的原代培养心肌细胞的保护作用。方法 培养的原代心肌细胞加入不同浓度的西红花酸后 ,用 0 .5 mm ol/ L OH·损伤原代培养的心肌细胞 ,检测细胞培养上清液中的乳酸脱氢酶 (L DH)、心肌细胞线粒体琥珀酸脱氢酶 (MSD)的活性 ,心肌细胞线粒体膜电位 (MMP)的变化 ,并用流式细胞仪及 DNA梯度电泳检测细胞凋亡。结果 0 .5 mm ol/ L OH·使细胞培养上清液中 L DH活性增加、MSD的活性降低、MMP降低、心肌细胞凋亡率增加。西红花酸 1.0 ,0 .1μmol/ L 明显降低培养上清液中 L DH活性、提高 MSD的活性及 MMP、降低心肌细胞凋亡率 ,与模型组比较差异显著 (P<0 .0 5 )。结论 西红花酸对OH·所致的心肌细胞损伤 (凋亡 )具有保护作用

Object To study the cardio-protective effect of crocetin on primary culture cardiac myocyte injured by hydroxyl free radicals. Methods After adding crocetin, primary culture cardiac myocyte was injured by 0.5 mmol/L hydroxyl free radicals which were generated by Fenton systems. The activity of lactic dehydrogenase (LDH) and mitochondrion succinic dehydrogenase (MSD) was observed. Mitochondrion membrane potential (MMP) was detected by Rh123. The ratio of cardiac myocyte apoptosis was investigated by flow cytometry and DNA ladder electrophoresis. Results Compared with the model group, crocetin significantly decreased the activity of LDH in culture supernatant and the ratio of cardiac myocyte apoptosis, markedly increased the activity of MSD and MMP. Conclusion Crocetin has the protective effect on the apoptosis of cardiac myocyte injured by hydroxyl free radical.