TRAF3IP2 mediates interleukin-18-induced cardiac fibroblast migration and differentiation.

TRAF3IP2 mediates interleukin-18-induced cardiac fibroblast migration and differentiation.
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DOI:
10.1016/j.cellsig.2013.07.013
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发表时间:
2013-11
影响因子:
4.8
通讯作者:
Chandrasekar B
Chandrasekar B
中科院分区:
生物学2区
文献类型:
--
作者:
Valente AJ;Sakamuri SS;Siddesha JM;Yoshida T;Gardner JD;Prabhu R;Siebenlist U;Chandrasekar B

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TRAF 3 IP 2是一种细胞质衔接蛋白,是IKK/NF-κB和JNK/AP-1的上游调节因子。在这里,我们首次证明,促炎细胞因子白细胞介素(IL)-18诱导TRAF 3 IP 2在原代心脏成纤维细胞(CF)中的表达在Nox 4/过氧化氢依赖性的方式。使用硫代磷酸化的、2-O '-甲基修饰的、胆固醇标记的TRAF 3 IP 2 siRNA双链体沉默TRAF 3 IP 2显著减弱了IL-18诱导的NF-κB和AP-1活化以及CF迁移。使用co-IP/IB和共定位实验,我们表明,Nox 4物理协会与IL-18受体蛋白,IL-18增强其结合。此外,IL-18促进成纤维细胞向肌成纤维细胞转化,如通过TRAF 3 IP 2增强的α-平滑肌肌动蛋白表达、1型和3型胶原诱导以及可溶性胶原分泌所证明的。这些结果表明TRAF 3 IP 2是IL-18诱导的CF迁移和体外分化的关键中间体。TRAF 3 IP 2可能作为一个潜在的治疗靶点,在体内心脏纤维化和不良重塑。
TRAF3IP2 is a cytoplasmic adapter protein and an upstream regulator of IKK/NF-κB and JNK/AP-1. Here we demonstrate for the first time that the proinflammatory cytokine interleukin (IL)-18 induces TRAF3IP2 expression in primary cardiac fibroblasts (CF) in a Nox4/hydrogen peroxide-dependent manner. Silencing TRAF3IP2 using a phosphorothioated, 2-O’-methyl modified, cholesterol-tagged TRAF3IP2 siRNA duplex markedly attenuated IL-18-induced NF-κB and AP-1 activation and CF migration. Using co-IP/IB and co-localization experiments, we show that Nox4 physically associates with IL-18 receptor proteins, and IL-18 enhances their binding. Further, IL-18 promotes fibroblast to myofibroblast transition, as evidenced by enhanced α-smooth muscle actin expression, types 1 and 3 collagen induction, and soluble collagen secretion, via TRAF3IP2. These results indicate that TRAF3IP2 is a critical intermediate in IL-18-induced CF migration and differentiation in vitro. TRAF3IP2 could serve as a potential therapeutic target in cardiac fibrosis and adverse remodeling in vivo.
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