Loss of Function of Scavenger Receptor SCAV-5 Protects C. elegans Against Pathogenic Bacteria.

Loss of Function of Scavenger Receptor SCAV-5 Protects C. elegans Against Pathogenic Bacteria.
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清道夫受体 SCAV-5 功能丧失可保护线虫免受病原菌侵害

DOI:
10.3389/fcimb.2021.593745
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发表时间:
2021
影响因子:
5.7
通讯作者:
Zheng Q
Zheng Q
中科院分区:
医学2区
文献类型:
--
作者:
Luo A;Jing H;Yuan L;Wang Y;Xiao H;Zheng Q

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清道夫受体作为模式识别受体,在先天免疫中发挥着关键作用。线虫中有六种 B 类清道夫受体同源物。然而,目前尚不清楚它们是否是宿主防御细菌病原体所必需的。在这里,我们发现,在六种 SCAV 蛋白中,只有功能丧失的 scav-5 通过不同的机制保护线虫免受致病菌鼠伤寒沙门氏菌 SL1344 和铜绿假单胞菌 PA14 的侵害。由于饮食限制,scav-5 突变体对鼠伤寒沙门氏菌 SL1344 具有抗性。而 scav-5 在保守的 PMK-1 p38 MAPK 通路中作用于 tir-1 的上游或平行,上调先天免疫反应,以保护蠕虫免受铜绿假单胞菌 PA14 的侵害。这是首次证明 SCAV-5 在宿主防御病原菌方面的作用。我们的结果为进一步阐明 scav-5 调节先天免疫反应的潜在分子机制提供了重要基础。
Scavenger receptors play a critical role in innate immunity by acting as the pattern-recognition receptors. There are six class B scavenger receptors homologs in C. elegans. However, it remains unclear whether they are required for host defense against bacterial pathogens. Here, we show that, of the six SCAV proteins, only loss of function scav-5 protect C. elegans against pathogenic bacteria S. typhimurium SL1344 and P. aeruginosa PA14 by different mechanism. scav-5 mutants are resistant to S. typhimurium SL1344 due to dietary restriction. While scav-5 acts upstream of or in parallel to tir-1 in conserved PMK-1 p38 MAPK pathway to upregulate the innate immune response to defend worms against P. aeruginosa PA14. This is the first demonstration of a role for SCAV-5 in host defense against pathogenic bacteria. Our results provide an important basis for further elucidating the underlying molecular mechanism by which scav-5 regulates innate immune responses.
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发表时间: 2011-07-08
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