四逆汤在过氧化氢引起的心肌细胞氧化应激性损伤中的保护效应

目的:观察四逆汤对乳鼠心肌细胞在过氧化氢损伤中的保护效应,探讨Bcl-xL/xS mRNA在四逆汤抗过氧化氢损伤保护心肌细胞中的作用.方法:采用过氧化氢诱导损伤制备乳鼠心肌细胞氧化应激性损伤模型,分别用含不同浓度的四逆汤含药血清DMME培养基培养细胞,应用流式细胞仪检测培养细胞的存活率,筛选合适的四逆汤含药血清培养细胞的浓度;用1 mmol/L过氧化氢处理心肌细胞,分别在处理0.5 h,1 h,2 h,3 h,4 h,8 h后检测细胞内丙二醛(MDA)和过氧化物歧化酶(SOD)的活性,并用流式细胞仪检测不同作用时间的细胞凋亡率和坏死率;在过氧化氢处理心肌细胞1 h和8 h后,收获细胞,检测细胞胞浆Bcl-xL和Bcl-xSmRNA的表达情况.结果:采用含15%四逆汤含药血清的DMEM培养基是心肌细胞生长的合适浓度;过氧化氢对心肌细胞的损伤程度与处理时间成正相关;与单纯过氧化氢处理组相比,四逆汤含药血清组细胞内MDA的含量降低,SOD的活性增加,细胞的凋亡率和坏死率降低,Bcl-xL mRNA表达增加,Bcl-xS mRNA表达减少.结论:四逆汤含药血清有较好的抗氧化应激性损伤保护心肌细胞的作用,这种保护作用可能通过增加Bcl-xL mRNA的表达,降低Bcl-xS mRNA的表达来实现.

Protective Effects of Sini Decoction on Cardiomyocytes in Oxidative Stress Damage Induced by Peroxide

Objective:To investigate protective effects of Sini decoction on cardiomyocytes from oxidative stress damage induced by peroxide (H 2O 2).Methods:Ventricular cardiomyocytes were prepared from 1-to-2-day-old Sprague-Dawley rats and cultured with DMEM culture media containing 15% neonatal bovine serum.4 days later,culture media were replaced with neonatal bovine serum-free DMEM with 15%,1.5% and 0.15% SD rats serum containing Sini decoction, respectively.Viablity percentage of rat cardiomyocytes was detected by flow cytometry using Annexin V-FITC to screen the appropriate SD rat serum concentration containing Sini decoction in DMEM culture media.Cardiomyocytes were exposed to 1 mmol/L H 2O 2 for 0.5h,1h,2h,4h and 8h respectively.MDA and SOD in cardiomyocytes were measured.Apoptosis and necrosis percentage of cardiomyocytes were measured by flow cytometry using Annexin V-FITC as well.Bcl-xL and Bcl-xS mRNA in cardiomyocytes were detected by polymerase chain reaction.Result:15% SD rat serum with Sini decoction in DMEM culture midia was the appropriate concentrate for cell growth.MDA and SOD in cardiomyocytes were changed with time elapse of cardiomyocytes exposure to H 2O 2.Sini decoction could inhibit rat cardiomyocytes from oxidative stress damage induced by H 2O 2.Conclusion:To some extend,Sini decoction inhibit rat cardiomyocytes from oxidative stress damage induced by peroxide through promoting expression of Bcl-xL mRNA and decreasing expression of Bcl-xS mRNA in cardiomyocytes.