Analysis of the functional role of Toll-like receptor-4 tyrosine phosphorylation.

Analysis of the functional role of Toll-like receptor-4 tyrosine phosphorylation.
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Toll样受体4酪氨酸磷酸化的功能作用分析。

DOI:
10.1007/978-1-59745-541-1_10
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发表时间:
2009
期刊:
Methods in molecular biology (Clifton, N.J.)
影响因子:
--
通讯作者:
Piao,Wenji
Piao,Wenji
中科院分区:
--
文献类型:
--
作者:
Medvedev,AndreiE;Piao,Wenji

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toll样受体(TLRs)是主要的先天免疫传感器,关键参与识别进化保守的微生物和病毒结构,称为“病原体相关分子模式”(PAMPs)。虽然许多TLR的识别模式已经被表征,但启动TLR信号传导的分子机制尚不清楚。由于许多受体系统的翻译后修饰在启动信号传导中很重要,因此我们研究了革兰氏阴性细菌脂多糖(LPS)的主要传感器TLR4的酪氨酸磷酸化是否在TLR4信号转导功能中起作用。我们发现,LPS诱导TLR4酪氨酸磷酸化和Toll-IL-1R信号域酪氨酸残基突变显著抑制TLR4介导的JNK和p38 MAP激酶以及转录因子NF-κB、RANTES和IFN-β的激活。本章总结了可用于证明TLR4酪氨酸磷酸化在受体信号传导中不可或缺的作用的方法学方法的组合,包括瞬时转染,定点诱变,免疫沉淀和免疫印迹分析,以及报告基因分析中转录因子激活的分析。
Toll-like receptors (TLRs) are principal innate immune sensors critically involved in the recognition of evolutionary conserved microbial and viral structures called “pathogen-associated molecular patterns”(PAMPs). Although recognition patterns of many TLRs have been characterized, molecular mechanisms that initiate TLR signaling are poorly understood. Since posttranslational modifications of many receptor systems are important in initiating signaling, we studied whether tyrosine phosphorylation of TLR4, the principal sensor of Gram-negative bacterial lipopolysaccharide (LPS) plays a role in TLR4 signaltransducing functions. We found that LPS induced TLR4 tyrosine phosphorylation and mutations of tyrosine residues in the Toll-IL-1R signaling domain markedly suppressed TLR4-mediated activation of JNK and p38 MAP kinases and transcription factors NF-κB, RANTES, and IFN-β. This chapter summarizes a combination of methodological approaches that can be used to demonstrate an indispensable role of TLR4 tyrosine phosphorylation in receptor signaling, including transient transfections, site-directed mutagenesis, immunoprecipitation and immunoblot analyses, and analyses of transcription factor activation in reporter assays.
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