Protective effects of astragaloside Ⅳ on injured rat cardiomyocytes caused by hydrogen peroxide
- Author:
- No author available
- Journal Title:
- CHINA MEDICINE
- Issue:
- 1
- DOI:
- 10.3760/cma.j.issn.1673-4777.2011.01.016
- Key Word:
- 心肌缺血;黄芪;过氧化氢;细胞保护;Astragaloside Ⅳ;Cardiomyocyte;Hydrogen peroxide;Protective effect;Mechanism
Abstract： Objective To study the effects of Astragaloside Ⅳ on injured rat cardiomyocytes caused by hydrogen peroxide (H2O2). Methods Three clean Wistar rats were supplied by Experimental Animal Center,Xingjiang medical university. Primary rat cardiomyocytes were isolated in vitro and cultured in 75 cm2 flasks. When cells were at 80% confluence, they were cultured with 0.5 mmol/L H2O2 medium for 4 hours and then treated with 6 ml 100, 10, 1,0. 1 μmol/L Astragaloside Ⅳ medium for24 hours. Cells in the control group were treated with an equal volume of normal medium. Cell survival rate were examined by trypan blue exclusion assay. Enzyme activities of lactate dehydrogenase(LDH), superoxide dismutase(SOD) and glutathione peroxidase(GSH-Px) were assayed by Elisa. The mRNA and protein expression were detected with realtime polymerase clain reaction(PCR) and Westernhlot method separately. Results Astragaloside Ⅳ promoted cardiomyocytes survival rate in a dose-dependent manner, while high concentration showed an inhibition tendency. Astragaloside Ⅳ decreased LDH activity (P ＜0.01 ) but increased SOD and GSH-Px activities (P ＜0.05 ). The results of Realtime PCR and Westernblot showed that Astragaloside Ⅳ could suppress expression of bax mRNA and protein, promote expression of cbl-2 mRNA and protein. Conclusions Astragaloside Ⅳ has protective effects on injured rat cardiomyocytes caused by H2O2, which is probably associated with regulating expression of bax/bcl-2 gene and protein.
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