摘要
目的探讨M3型乙酰胆碱受体(M3R)对心脏成纤维细胞α-平滑肌肌动蛋白(IX-SMA)的表达影响及其机制。方法体外分离培养大鼠心脏成纤维细胞,Western blot法测定仅.SMA、p38丝裂原活化蛋白激酶(p38)、磷酸化p38(p-p38)和Ras相关c3肉毒素底物1(Racl)的表达;谷胱甘肽巯基转移酶沉淀实验(GSTPull.down)法检测Racl的活性。结果乙酰胆碱(1.0×10-7、1.0×10-1、1.0×10-5mol/L,2h)呈浓度依赖性促进α-SMA的表达上调(P〈0.05),M3R特异性阻断剂4-二苯乙酰氧基-N-甲基-哌啶(4-DAMP)抑制乙酰胆碱(Ach)介导的α--SMA表达上调(1.432±0.093比2.534±0.241,P〈0.05);M3R促进p-p38表达上调(171%,P〈0.05),p38特异性抑制剂SB203580抑制M3R介导的α-SMA表达上调(1.614±0.128比2.873±0.193,P〈0.05);M3R活化Racl(182%,P〈0.05),Racl特异性抑制剂NSC23766抑制M3R介导的p-p38表达上调(1.301±0.154比1.821±0.113,P〈0.05)。结论M3R通过激活Rael-p38信号通路促进心脏成纤维细胞α-SMA的表达。
Objective To investigate the effects of M3 muscarinic acetylcholine receptor (M3R) on alpha smooth muscle aetin (α- - SMA) expression and the related mechanisms. Methods In cultured cardiac fibroblasts, Western blotting analysis was used to examine the protein levels ofα- SMA, p38 mito- gen - activated protein kinases ( p38 ), phosphorylated p3g ( p - p38 ) and Ras - related C3 botulinum tox- in substrate 1 ( Rael ). Racl activity was examined by GST Pull - down assays. Results M3R agonist acetyeholine ( 1.0×10-7、1.0×10-1、1.0×10-5mol/L,2h) promotedα- SMA expression in euhured cardiac fibroblasts ( P 〈 0. 05 ), and the effect was attenuated by M3R selective antagonist 4 - diphenylace- toxy- N - methylpiperidine methiodide (4 - DAMP, 1. 432 ± 0. 093 vs. 2. 534 ± 0. 241 ,P 〈 0. 05 ). Fur- thermore, the up- regulation of α-SMA expression by M3R appeared to be mediated by an upregulation in phosphorylation of p38 (171% , P 〈 0. 05 ). In addition, M3R enhanced Rael activity (182% , P 〈 0.05) and Racl antagonist NSC23766 inhibited M3R-induced p- p38 upregulation (1. 301 ±0. 154 vs. 1. 821 ± 0. 113 ,P 〈 0. 05 ). Conclusion These results suggest that M3R up -regulates α-SMA expres- sion in cardiac fibroblasts via Racl -p38 signaling pathway.
出处
《中华实验外科杂志》
CAS
CSCD
北大核心
2016年第8期1950-1952,共3页
Chinese Journal of Experimental Surgery
基金
国家自然科学基金(81300685)