研究揭示cFLIPL調節炎症反應機制
作者:
小柯機器人發布時間:2020/3/28 22:31:25
美國波士頓塔夫茨大學醫學院Alexander Poltorak研究團隊取得新進展。他們發現細胞FLICE樣抑制蛋白(cFLIP)可通過抑制複合物II的形成來保護巨噬細胞免受LPS誘導的細胞焦亡。該研究於2020年3月20日發表於《科學》雜誌上。
為了進一步表徵脂多糖(LPS)誘導的體外分泌機制,他們揭示了cFLIP在調節炎症反應中的重要作用。
研究人員表示,細胞死亡和炎症是宿主對感染的相互依賴反應。在細胞焦亡期間,白細胞介素1β(IL-1β)通過caspase-1和caspase-11介導形成的gasdermin D孔釋放。在體內,對LPS的反應導致IL-1β分泌。然而,在體外,鼠巨噬細胞需要炎性體驅動的IL-1β成熟的第二個「危險信號」。最近的報導顯示,在LPS活化的巨噬細胞中,caspase-8介導細胞焦亡,但在這些條件下有關IL-1β釋放的證據相互矛盾。
附:英文原文
Title: cFLIPL protects macrophages from LPS-induced pyroptosis via inhibition of complex II formation
Author: Hayley I. Muendlein, David Jetton, Wilson M. Connolly, Keith P. Eidell, Zoie Magri, Irina Smirnova, Alexander Poltorak
Issue&Volume: 2020/03/20
Abstract: Abstract
Cell death and inflammation are interdependent host responses to infection. During pyroptotic cell death, interleukin-1β (IL-1β) release occurs through caspase-1 and caspase-11–mediated gasdermin D pore formation. In vivo, responses to lipopolysaccharide (LPS) result in IL-1β secretion. In vitro, however, murine macrophages require a second 「danger signal」 for the inflammasome-driven maturation of IL-1β. Recent reports have shown caspase-8–mediated pyroptosis in LPS-activated macrophages but have provided conflicting evidence regarding the release of IL-1β under these conditions. Here, to further characterize the mechanism of LPS-induced secretion in vitro, we reveal an important role for cellular FLICE-like inhibitory protein (cFLIP) in the regulation of the inflammatory response. Specifically, we show that deficiency of the long isoform cFLIPL promotes complex II formation, driving pyroptosis, and the secretion of IL-1β in response to LPS alone.
DOI: 10.1126/science.aay3878
Source: https://science.sciencemag.org/content/367/6484/1379
Science:《科學》,創刊於1880年。隸屬於美國科學促進會,最新IF:41.037