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IRAK1-dependent signaling mediates mortality in polymicrobial sepsis.

Abstract：

:Interleukin-1 receptor-associated kinase (IRAK1) is a key regulatory protein in TLR/IL1R-mediated cell activation during inflammatory response. Studies indicated that pending on the nature of the used inflammatory model, downregulation of IRAK1 may be beneficial or detrimental. However, the role of IRAK1 in affecting outcome in polymicrobial sepsis is unknown. We tested this question using an IRAK1-deficient mouse strain and cecal ligation and puncture (CLP) procedure, which is a clinically relevant rodent septic model. Sepsis-induced mortality was markedly lower in IRAK1-deficient mice (35 %) compared to WT (85 %). Sepsis-induced increases in blood IL-6 and IL-10 levels were blunted at 6 h post-CLP in IRAK1 deficiency compared to WT, but cytokine levels were similar at 20 h post-CLP. Sepsis-induced blood granulocytosis and depletion of splenic B cells were also blunted in IRAK1-deficient mice as compared to WT. Analysis of TLR-mediated cytokine responses by IRAK1-deficient and WT macrophages ex vivo indicated a TLR4-dependent downregulation of IL-6 and IL1β in IRAK1 deficiency, whereas TLR2-dependent responses were unaffected. TLR7/8-mediated IL-6, IL1β, and IL-10 production was also blunted in IRAK1 macrophages as compared to WT. The study shows that IRAK1 deficiency impacts multiple TLR-dependent pathways and decreases early cytokine responses following polymicrobial sepsis. The delayed inflammatory response caused by the lack of IRAK1 expression is beneficial, as it manifests a marked increased chance of survival after polymicrobial sepsis.

journal_name

Inflammation

journal_title

Inflammation

authors

Chandra R,Federici S,Bishwas T,Németh ZH,Deitch EA,Thomas JA,Spolarics Z

doi

10.1007/s10753-013-9692-1

subject

Has Abstract

pub_date

2013-12-01 00:00:00

pages

1503-12

issue

6

eissn

0360-3997

issn

1573-2576

journal_volume

36

pub_type

杂志文章

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