FIP200 is involved in murine pseudomonas infection by regulating HMGB1 intracellular translocation.

FIP200 is involved in murine pseudomonas infection by regulating HMGB1 intracellular translocation.
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FIP200通过调节HMGB1细胞内易位参与鼠假单胞菌感染。

DOI:
10.1159/000362954
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发表时间:
2014
期刊:
Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology
影响因子:
--
通讯作者:
Wu M
Wu M
中科院分区:
其他
文献类型:
--
作者:
Li Y;Gan CP;Zhang S;Zhou XK;Li XF;Wei YQ;Yang JL;Wu M

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FIP200 是一种关键的自噬启动蛋白,可以参与多种细胞功能,包括癌症的发展;然而,其在肺泡巨噬细胞铜绿假单胞菌感染中的功能作用尚不清楚。为了研究 FIP200 在宿主防御中的作用,我们用 FIP200 siRNA 转染小鼠肺泡巨噬细胞 MH-S 细胞。在确认 FIP200 敲除抑制 PAO1 诱导的自噬体形成后,我们试图通过免疫印迹来表征潜在的信号通路。此外,我们使用 fip200 KO 小鼠来研究 fip200 缺陷对 HMGB1 易位的影响。我们发现假单胞菌 PAO1 菌株感染促进自噬体形成,而 FIP200 的敲低则抑制 MH-S 细胞中自噬体形成和 HMGB1 表达。沉默 FIP200 会损害 HMGB1 向 MH-S 细胞胞浆的易位,并且在 PAO1 感染期间几乎消除了 HMGB1 的乙酰化。相反,FIP200 过表达促进了 HMGB1 从细胞核的胞质转位,并增加了 PAO1 感染的 MH-S 细胞中 HMGB1 的乙酰化。重要的是,在 PAO1 感染后,fip200 KO 小鼠中 HMGB1 的表达和乙酰化也显着下调。总的来说,这些发现阐明 FIP200 可能在 PAO1 感染期间调节 HMGB1 的表达和易位,这可能表明控制肺部感染的新治疗靶点。
FIP200, a critical autophagy initiating protein, can participate in numerous cellular functions including cancer development; however, its functional role in P. aeruginosa infection of alveolar macrophages is unknown. To investigate the role of FIP200 in host defense, we transfected murine alveolar macrophage MH-S cells with FIP200 siRNA. Having confirmed that FIP200 knockdown inhibited PAO1-induced autophagosme formation, we sought to characterize the underlying signaling pathways by immunoblotting. Further, we used fip200 KO mice to study the effects of fip200 deficiency on HMGB1 translocation. We showed that Pseudomonas PAO1 strain infection facilitated autophagosome formation, whereas knockdown of FIP200 inhibited autophagosome formation and HMGB1 expression in MH-S cells. Silencing FIP200 impaired the translocation of HMGB1 to cytosol of MH-S cells and almost abolished acetylation of HMGB1 during PAO1 infection. In contrast, FIP200 overexpression facilitated the cytosol translocation of HMGB1 from nuclei and increased acetylation of HMGB1 in PAO1-infected MH-S cells. Importantly, expression and acetylation of HMGB1 were also significantly down-regulated in fip200 KO mice following PAO1 infection. Collectively, these findings elucidate that FIP200 may regulate expression and translocation of HMGB1 during PAO1 infection, which may indicate novel therapeutic targets to control pulmonary infection.
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