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尾加压素Ⅱ促进血管外膜成纤维细胞表达白细胞介素6 被引量:1

Urotensin Ⅱ Promotes Interleukin-6 Expression in Aortic Adventitial Fibroblasts
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摘要 目的探讨尾加压素Ⅱ(UⅡ)对大鼠血管外膜成纤维细胞表达白细胞介素6(IL-6)作用的影响及其细胞内信号转导机制。方法雄性SD大鼠胸主动脉外膜成纤维细胞体外同步化培养24 h后,于无血清DMEM培养基中加入UⅡ(10^-10^-10^-7mol/L),共孵育3-24 h。为了探索UⅡ的作用机制,加入细胞内不同的信号转导通路抑制剂,处理30 min后,加入UⅡ(10^-8mol/L)共孵育3 h或12 h。实验结束时,收集细胞,采用逆转录-聚合酶链反应法检测细胞IL-6 mRNA表达(3 h);另外,细胞实验结束后收集培养液,采用酶联免疫吸附测定法检测IL-6分泌水平(12 h)。结果 (1)UⅡ呈浓度(10^-10^-10^-7mol/L)和时间依赖性方式促进外膜成纤维细胞中IL-6 mRNA表达和蛋白分泌,至10^-8mol/L UⅡ达高峰(P〈0.01);UⅡ(10^-8mol/L)刺激IL-6基因表达3 h达高峰,蛋白分泌24 h达高峰(P〈0.01)。(2)UⅡ促进外膜成纤维细胞表达IL-6的效应能被UⅡ受体阻断剂SB710411(10^-6mol/L)、钙离子通道阻断剂尼卡地平(10^-5mol/L)、丝裂原活化蛋白激酶抑制剂PD980959(10^-5mol/L)、蛋白激酶C抑制剂H7(10^-5mol/L)、Rho激酶抑制剂Y-27632(10^-5mol/L)和钙调神经磷酸酶抑制剂环孢霉素A(10^-5mol/L)所抑制(P〈0.01)。结论 UⅡ明显促进大鼠主动脉外膜成纤维细胞IL-6的表达,该作用通过激活UⅡ受体、钙离子通道、丝裂原活化蛋白激酶、蛋白激酶C、Rho激酶和钙调神经磷酸酶信号途径来实现,提示UⅡ诱导外膜成纤维细胞表达IL-6升高可能是其参与动脉粥样硬化的重要机制之一。 Aim To explore the effect of urotensin Ⅱ( UⅡ) on expression of interleukin-6( IL-6) in rat aortic adventitial fibroblast( AF) and its intracellular mechanisms. Methods Growth-arrested AF was incubated in serumfree medium with UⅡ( 10^- 10- 10^- 7mol /L). In order to explore the mechanism of UⅡ effects,the cells were pretreated with some inhibitors of signal transduction pathways for 30 min,and then incubated with UⅡ( 10^- 8mol /L) for 3 h to24 h. The IL-6 mRNA expression in the cells and secretion from the cells induced by UⅡ were evaluated by reverse transcription polymerase chain reaction( RT-PCR) and enzyme-linked immunosorbent assay( ELISA),respectively. Results( 1) UⅡ significantly increased IL-6 mRNA expression and protein secretion in rat AF,in a concentration-dependent( 10^- 10- 10^- 7mol /L) and a time-dependent manner,with maximal effect at 10^- 8mol /L at 3 h for mRNA expression,or at 24 h for protein secretion( both P〈0. 01).( 2) The effect of UⅡ was inhibited by SB710411( 10^- 6mol /L),nicardipine( 10^- 5mol /L),PD98059( 10^- 5mol /L),H7( 10^- 5mol /L),Y-27632( 10^- 5mol /L) and cyclosporine A( CsA)( 10^- 5mol /L),the inhibitors of UⅡ receptor,Ca^2 +channel,mitogen activated protein kinase,protein kinase C,Rho kinase,and calcineurin,respectively. Conclusion UⅡ significantly induces IL-6 expression in rat AF,via activation of its receptor,Ca^2 +channel,mitogen activated protein kinase,protein kinase C,Rho kinase and calcineurin signal transduction pathways,indicating that UⅡ induced-IL-6 expression is one of the important mechanisms responsible for accelerated atherosclerosis.
出处 《中国动脉硬化杂志》 CAS CSCD 北大核心 2014年第8期763-768,共6页 Chinese Journal of Arteriosclerosis
基金 国家自然科学基金(30971273 81270223) 广东省自然科学基金(9151051501000016 S2011010000450) 广东省杰出大学生创新实验项目(1056010010)
关键词 尾加压素Ⅱ 白细胞介素6 血管外膜成纤维细胞 动脉粥样硬化 Urotensin Ⅱ Interleukin-6 Adventitial Fibroblast Atherosclerosis
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