Protein kinase D1 is essential for MyD88-dependent TLR signaling pathway.

Protein kinase D1 is essential for MyD88-dependent TLR signaling pathway.
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DOI:
10.4049/jimmunol.0804239
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发表时间:
2009-05-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Yi AK
Yi AK
中科院分区:
其他
文献类型:
--
作者:
Park JE;Kim YI;Yi AK

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蛋白激酶D1(PKD1)已被证明参与多种Toll样受体(TLR)配体引起的某些丝裂原活化蛋白激酶(MAPK)激活和细胞因子表达。然而,PKD1在TLR各自信号传导中的精确生理作用尚未完全阐明。在此,我们提供证据表明除TLR3配体之外,PKD1可被TLR配体激活。TLR配体对PKD1的激活依赖于髓样分化因子88(MyD88)、白细胞介素-1受体相关激酶4(IRAK4)和白细胞介素-1受体相关激酶1(IRAK1),但不依赖于肿瘤坏死因子受体相关因子6(TRAF6)。敲低PKD1的巨噬细胞和骨髓来源的树突状细胞显示,PKD1对于TRAF6的MyD88依赖性泛素化、转化生长因子β激活激酶1(TAK1)、MAPK和转录因子的激活以及TLR配体诱导的促炎基因表达是必不可少的,但不参与TLR配体诱导的I型干扰素表达以及TLR3和TLR4配体诱导的含TIR结构域的衔接蛋白诱导的基因(TRIF - 依赖性基因)表达。这些结果表明PKD1对于MyD88依赖性促炎免疫反应至关重要。
Protein kinase D1 (PKD1) has been shown to be involved in certain MAPK activation and cytokine expression by several TLR ligands. However, the precise physiological role of PKD1 in individual signaling from TLRs has not been fully addressed. Here, we provide evidence that PKD1 is being activated by TLR ligands, except the TLR3 ligand. PKD1 activation by TLR ligands is dependent on MyD88, IRAK4, and IRAK1, but independent of TRAF6. PKD1-knockdown macrophages and bone marrow-derived dendritic cells revealed that PKD1 is indispensable for the MyD88-dependent ubiquitination of TRAF6, activation of TAK1, MAPKs, and transcription factors and expression of pro- inflammatory genes induced by TLR ligands, but is not involved in expression of type I IFNs induced by TLR ligands and TRIF-dependent genes induced by TLR3 and TLR4 ligands. These results demonstrate that PKD1 is essential for MyD88-dependent pro- inflammatory immune responses.
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