首页> 美国卫生研究院文献>The Journal of Biological Chemistry >The NLR Adaptor ASC/PYCARD Regulates DUSP10 Mitogen-activated Protein Kinase (MAPK) and Chemokine Induction Independent of the Inflammasome
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The NLR Adaptor ASC/PYCARD Regulates DUSP10 Mitogen-activated Protein Kinase (MAPK) and Chemokine Induction Independent of the Inflammasome

机译:NLR适配器ASC / PYCARD调节DUSP10丝裂原激活的蛋白激酶(MAPK)和趋化因子的诱导独立于炎症小体

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摘要

ASC/PYCARD is a common adaptor for a diverse set of inflammasomes that activate caspase-1, most prominently the NLR-based inflammasome. Mounting evidence indicates that ASC and these NLRs also elicit non-overlapping functions, but the molecular basis for this difference is unclear. To address this, we performed microarray and network analysis of ASC shRNA knockdown cells. In pathogen-infected cells, an ASC-dependent interactome is centered on the mitogen-activated protein kinase (MAPK) ERK and on multiple chemokines. ASC did not affect the expression of MAPK but affected its phosphorylation by pathogens and Toll-like receptor agonists via suppression of the dual-specificity phosphatase, DUSP10/MKP5. Chemokine induction, DUSP function, and MAPK phosphorylation were independent of caspase-1 and IL-1β. MAPK activation by pathogen was abrogated in Asc−/− but not Nlrp3−/−, Nlrc4−/−, or Casp1−/− macrophages. These results demonstrate a function for ASC that is distinct from the inflammasome in modulating MAPK activity and chemokine expression and further identify DUSP10 as a novel ASC target.
机译:ASC / PYCARD是激活caspase-1(最主要是基于NLR的炎症小体)的各种炎症小体的通用适配器。越来越多的证据表明,ASC和这些NLR也具有不重叠的功能,但这种差异的分子基础尚不清楚。为了解决这个问题,我们对ASC shRNA敲低细胞进行了微阵列和网络分析。在病原体感染的细胞中,ASC依赖的相互作用基因组集中在有丝分裂原激活的蛋白激酶(MAPK)ERK和多种趋化因子上。 ASC不会影响MAPK的表达,但会通过抑制双特异性磷酸酶DUSP10 / MKP5来影响病原体和Toll样受体激动剂使其磷酸化。趋化因子诱导,DUSP功能和MAPK磷酸化与caspase-1和IL-1β无关。在Asc -/-中废除了病原体的MAPK激活,但在Nlrp3 -/-,Nlrc4 -/-或Casp1 -中没有/ − 巨噬细胞。这些结果证明了ASC的功能与炎性体不同,可调节MAPK活性和趋化因子表达,并进一步将DUSP10鉴定为新型ASC靶标。

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