蒺藜皂苷单体B对心肌细胞缺氧/复氧损伤的保护作用

目的观察蒺藜皂苷单体B(TTSMB)对大乳鼠心肌细胞缺氧/复氧损伤的保护作用。方法分离出生1～3d大鼠心肌细胞,培养72h后随机分为:正常对照组(Control)、缺氧/复氧模型组(H/R)、蒺藜皂苷组(GSTT)、蒺藜皂苷单体B(TTSMB)10、1、0.1nmol·L-1组。观察细胞形态学变化,应用MTT比色法检测细胞存活率,测定培养基中肌酸激酶(CK)、乳酸脱氢酶(LDH)、天门冬氨酸氨基转移酶(AST)释放量,超氧化物歧化酶(SOD)活性,丙二醛(MDA)含量,并采用流式细胞仪检测心肌细胞凋亡率及应用Western blot检测TTSMB对凋亡相关蛋白caspase-3的作用。结果与对照组比较,H/R组心肌细胞存活数明显减少,心肌细胞培养液中CK、LDH、AST释放量增加(P<0.01),SOD活力下降,MDA含量升高(P<0.01);与模型组比较,TTSMB10、1、0.1nmol·L-1组存活心肌细胞数明显增多(P<0.05,P<0.01),心肌细胞培养液中CK、LDH、AST含量降低,SOD活力增加、MDA含量降低(P<0.05,P<0.01),心肌细胞凋亡率明显下降,caspase-3表达亦下降。结论TTSMB可减轻心肌细胞缺氧/复氧损伤,抑制心肌细胞凋亡,具有心肌细胞保护作用,其机制与抗自由基作用有关。

Protective effect of Tribulus terrestris saponin monomer B on cadiocytes impaired by hypoxia-reoxygenation

Aim To observe the protection effect of Tribulus terrestris saponin monomer B (TTSMB) on cadiocytes impaired by hypoxia-reoxygenation (H/R).Methods Cadiocytes of neonate rat were cultivated for 72 hours and divided into normal control group, H/R group,GSTT 100 mg·L~(-1) group and TTSMB 10,1,0.1 nmol·L~(-1) group.Morphocytology change of cadiocytes was observed after the treatment.Cadiocyte survival rate was detected with MTT colorimetric method.Levels of creatine kinase (CK), lactate dehydrogenase (LDH), aspartate aminotransferase (AST), malondialdehyde (MDA), and activity of superoxide dismutase (SOD) were determined. Apoptosis rate was detected with flow cytometry.Expression of caspase-3 was examined with western blot.Results Compared with the control group, the survival cell number in H/R group decreased obviously, content of CK,LDH, AST, MAD increased, and activity of SOD decreased (P<0.01).Compared with the model group, the survival cell population increased in TTSMB 10,1,0.1 nmol·L~(-1) group (P<0.05 and P<0.01).Contents of CK, LDH, AST, MAD decreased, whereas the activity of SOD increased (P<0.05 and P<0.01).Apoptosis rate and expression of caspase-3 also reduced in TTSMB 10,1,0.1 nmol·L~(-1) group.Conclusion TTSMB has significant cadiocytes protective effect against H/R and inhibits cadiocyte apoptosis,and the mechanism depends on the effect against oxygen free radical.