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纸质出版:2016
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α7nAChR激动剂对血管紧张素Ⅱ诱导的心肌成纤维细胞增殖和胶原合成的影响及其分子机制[J]. 中山大学学报(医学科学版), 2016,37(1).
Effect of α7 Nicotinic Acetylcholine Receptor Agonist on AngiotensinⅡ-induced Cardiac Fibroblasts Proliferation and Collagen Synthesis[J]. Journal of Sun Yat-sen University (Medical Sciences), 2016, 37(1).
摘 要: 【目的】 探讨α7烟碱乙酰胆碱受体(α7 nAchR)激动剂对血管紧张素Ⅱ(AngⅡ)诱导的心肌成纤维细胞增殖和胶原合成的影响及其分子机制。【方法】 培养出生2~3d大鼠心肌成纤维细胞(CF),取传代2 ~ 4代细胞,分为①空白对照组(control);②模型组(AngⅡ10-7 mol/L);③ACh预处理组:ACh + AngⅡ组(ACh 10-4 mol/L + AngⅡ10-7 mol/L);④α7nAChR激动剂组:α7nAChR激动剂+ AngⅡ组(PNU-282987 5 × 10-6 mol/L + AngⅡ10-7 mol/L);⑤α7nAChR拮抗剂组:ACh+甲基牛扁碱柠檬酸盐(MLA)+ AngⅡ组(ACh 10-4 mol/L + AngⅡ10-7 mol/L + MLA 1×10-6 mol/L)。干预24 h后,应用CCK-8试剂盒检测CF的增殖能力,western blot检测胶原蛋白Ι、α-SMA、α7烟碱乙酰胆碱受体(α7nAChR)、核中p65蛋白表达;Real-time PCR检测α7nAChR 的mRNA表达。【结果】 AngⅡ干预24h,CF增殖显著提高,胶原蛋白Ι、α-SMA、核中p65蛋白的表达明显升高,α7nAChR的mRNA和蛋白水平均表达降低;Ach、α7nAChR激动剂预处理后抑制CF增殖,胶原蛋白Ι、α-SMA和核中p65蛋白的表达降低,α7nAChR的mRNA和蛋白水平均表达升高;Ach+MLA预处理, CF增殖再次提高,胶原蛋白Ι、纤维化因子α-SMA、核中p65蛋白的表达再次明显升高,α7nAChR的mRNA和蛋白水平均表达降低。【结论】 α7nAChR激动剂抑制AngⅡ诱导的心肌成纤维细胞的增殖和胶原合成,其机制可能与NF-κB信号通路有关。
Abstract: 【Objective】 To investigate the effect of an α7 nicotinic acetylcholine receptor (α7 nAchR) agonist on cardiac fibroblast (CF) proliferation and collagen synthesis induced by angiotensin II (AngII) and to determine its molecular mechanism. 【Methods】 CF were cultured from hearts of Sprague -Dawley rats. The CF were divided into the following five groups: ① control group; ② model group (AngII 10-7 mol/L); ③AChpreconditioning group: ACh + Ang II group (ACh 10-4 mol/L + Ang II10-7 mol/L); ④ α7nAChR agonist group: α7nAChR agonist + Ang II group (PNU -282987 5×10-6 mol/L + AngII10 -7 mol/L); ⑤ α7nAChR antagonist group: ACh + Methyllycaconitine citrate (MLA) + AngII group (ACh 10-4 mol/L + AngII10 -7 mol/L + MLA 10-6 mol/L). The CCK -8 assay was used to test the proliferation of CF. Protein expression of collagen I, α -smooth muscle actin (α -SMA), α7nAChR, and p65 were analyzed by western blotting. The mRNA expression of α7nAChR was measured by real -time PCR. 【Results】 Incubation with Ang II induced significant proliferation of CF. Expressions of collagen I, α -SMA, and p65 were significantly increased, while the α7nAChR protein and mRNA levels were significantly decreased. PNU -282987 significantly inhibited the AngII -induced CF proliferation; deregulated expressions of collagen I, α -SMA, and p65; and up -regulated α7nAChR protein and mRNA levels. Preconditioning with ACh + MLA restored the proliferation of CF and the expressions of collagen I, fibrosis factor α -SMA, and p65, while the α7nAChR protein and mRNA levels decreased. 【Conclusion】 Anα7nAChR agonist can inhibit AngII-induced CF proliferation and collagen synthesis, in part by inhibiting the NF-κB signaling pathways.
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