The interleukin-1 receptor-associated kinase M selectively inhibits the alternative, instead of the classical NFkappaB pathway.

The interleukin-1 receptor-associated kinase M selectively inhibits the alternative, instead of the classical NFkappaB pathway.
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DOI:
10.1159/000158541
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发表时间:
2009
影响因子:
5.3
通讯作者:
Li L
Li L
中科院分区:
医学2区
文献类型:
--
作者:
Su J;Zhang T;Tyson J;Li L

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先天免疫信号传导过程受到许多正向和负向调节因子的控制。白细胞介素 1 受体相关激酶 M (IRAK-M) 是有助于减弱 NFκB 激活的负调节因子之一。然而,所涉及的分子机制尚不清楚。在本报告中,我们观察到 IRAK-M 选择性抑制 NIK-IKKα 介导的替代 NFκB 通路。 IRAK-M 的缺失导致 NIK 稳定,有利于 IKKα/IKKα 同二聚体而不是 IKKα/IKKβ 异二聚体的形成,并增强 RelB 核分布。相反,p65核定位和磷酸化不受IRAK-M缺陷的影响。 IRAK-M 缺陷细胞表现出选定细胞因子(例如 IL-6 和 GM-CSF)表达增加,以及 IκBα 重新合成加快。当使用特异性 siRNA 敲低 RelB 表达时,IL-6 和 GM-CSF 表达的增加被消除。我们还证明,观察到的 IRAK-M 抑制作用主要限于 TLR2 配体,而不是 TLR4。综上所述,我们的研究结果表明,IRAK-M 以配体特异性方式负向调节替代 NFκB 通路。
The innate immunity signaling process is controlled by numerous positive and negative regulators. The interleukin-1 receptor-associated kinase M (IRAK-M) is one of the negative regulators that contribute to the attenuation of NFκB activation. The molecular mechanism involved, however, is poorly defined. In this report, we observed that IRAK-M selectively suppresses the NIK-IKKα-mediated alternative NFκB pathway. Deletion of IRAK-M led to NIK stabilization, favored the formation of the IKKα/IKKα homodimer instead of the IKKα/IKKβ heterodimer, and enhanced RelB nuclear distribution. In contrast, p65 nuclear localization and phosphorylation was not affected by IRAK-M deficiency. IRAK-M-deficient cells exhibited increased expression of selected cytokines such as IL-6 and GM-CSF, as well as quickened resynthesis of IκBα. The increased expression of IL-6 and GM-CSF was ablated when RelB expression was knocked down using specific siRNA. We also demonstrated that the observed inhibitory effect of IRAK-M was primarily limited to the TLR2 ligand, instead of TLR4. Taken together, our findings suggest that IRAK-M negatively regulates the alternative NFκB pathway in a ligand-specific manner.
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