蒺藜总皂苷对缺氧复氧损伤心肌细胞凋亡及凋亡相关基因bcl-2与bax表达的影响

目的观察蒺藜总皂苷（GSTT）对培养乳鼠心肌细胞模拟缺血再灌注损伤后心肌细胞凋亡及凋亡相关基因bcl-2、bax表达的影响。方法利用原代培养的SD乳鼠心肌细胞建立模拟心肌缺血再灌注（M1／R）模型，分正常培养组、模型组和蒺藜总皂苷大、小剂量组。流式细胞仪检测心肌细胞凋亡率，免疫组化检测心肌细胞凋亡基因bcl-2、bax的表达。结果GSTT大、小剂量组均可显著降低细胞凋亡率（P〈0．05）。GSTT大剂量组可显著上调bcl2表达（P〈0．01）、下调bax表达（P〈0．05），而GSTT小剂量组可上调bcl—2表达（P〈0．05），但对bax表达无明显影响。结论GSTT可抑制模拟缺血再灌注损伤心肌细胞的凋亡，其作用可能是通过上调bcl-2、下调bax表达实现的。

Effect of gross saponins from Tribulus terrestris L on myocardial apoptosis and its related gene bcl and bax expression induced by hypoxia-reoxygenation

Objective To investigate the effects of gross saponins from Tribulus terrestris L (GSTT) on myocardial apoptosis, and its related gene bcl-2 and bax expression after hypoxia/reoxygenation in cultured myocardial cells of neonatal rat. Methods After myocardial hypoxia/ reoxygenation model was established by culturing primary myocardial cell of neonatal rat in vivo. The myocardial cells were divided into four groups, the sham-operated group, model group, large- and low-dose of GSTT groups. The apoptotic rate of myocardial cells was determined by flow cytometry, and the expression of bcl-2 and bax was detected by using immuno-histochemical method. Results Both large- and low- dose of GSTT could significantly decrease the apoptotic rate (P<0.05). Large dose of GSTT significantly up-regulated bcl-2 expression and down-regulated bax expression (P<0.05), while low-dose of GSTT could down-regulate bcl-2 expression (P<0.05) and had insignificantly effect on bax expression. Conclusion GSTT could inhibit myocardial apoptosis induced by hypoxia/reoxygenation in cultured myocardial cell, its action mechanism may be through up-regulating the bcl-2 expression and down-regulating bax expression.