摘要
目的探究TGF-β1对哮喘大鼠气道平滑肌细胞(ASMC)增殖的影响,进一步揭示哮喘的发病机制。方法建立大鼠慢性哮喘模型,原代分离培养大鼠ASMC,将细胞分为正常组、哮喘组、TGF-β1组和TGF-β1+PD-98059组,以CCK-8法检测细胞增殖,Western blot法检测caveolin-1和p-ERK1/2蛋白表达。结果 TGF-β1组细胞增殖较正常组和哮喘组明显(均P<0.01);TGF-β1+PD-98059组细胞增殖较TGF-β1组减低,但较哮喘组仍明显(均P<0.05)。TGF-β1组p-ERK1/2表达量较正常组和哮喘组增加;TGF-β1+PD-98059组p-ERK1/2表达量较TGF-β1组减少,但较哮喘组表达量仍有所增加(均P<0.05)。TGF-β1组caveolin-1表达量较正常组和哮喘组减少(均P<0.05);TGF-β1+PD-98059组caveolin-1表达量较TGF-β1组增加(P<0.05)。结论 TGF-β1可以下调caveolin-1蛋白的表达量,激活ERK通路,从而促进哮喘大鼠ASMC的增殖,引起气道重塑。
Objective To investigate the effect of TGF- β1 on the proliferation of airway smooth muscle cells （ASMCs） in asthma rats. Methods Chronic asthma model was induced in rats and airway smooth muscle cells were isolated and cultured in vitro. The cultured ASMCs were divided into normal group, asthma group, TGF- β1 group and TGF- β1＋PD- 98059 group. The cellproliferation was determined with CCK- 8 method and the expression of caveolin- 1 and p- ERK1/2 protein was detected with Western blot. Results The expression of p- ERK1/2 increased significantly in TGF- β1 group compared with other 3 groups （P〈0.05）, while the expression in TGF- β1＋PD- 98059 group was higher than that in asthma group （P〈0.05）. The expression of caveolin- 1 in TGF- β1 group was lower than that in the normal group and asthma group as wel as in TGF- β1＋PD- 98059 group （P〈0.05）. Conclusion TGF- β1 can down- regulate the expression of protein caveolin- 1 to activate the ERK pathway, thereby to promote the proliferation of airway smooth muscle cells, which final y causes airway remodeling.
出处
《浙江医学》
CAS
2014年第13期1133-1136,共4页
Zhejiang Medical Journal
基金
浙江省卫生厅课题(2009A144)
