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Gasdermin D-independent release of interleukin-1β by living macrophages in response to mycoplasmal lipoproteins and lipopeptides.
Immunology ( IF 4.9 ) Pub Date : 2020-06-26 , DOI: 10.1111/imm.13230
Ayumi Saeki 1 , Kohsuke Tsuchiya 2, 3 , Takashi Suda 2 , Takeshi Into 4 , Akira Hasebe 1 , Toshihiko Suzuki 5 , Ken-Ichiro Shibata 1
Affiliation  

Interleukin‐1β (IL‐1β) plays pivotal roles in controlling bacterial infections and is produced after the processing of pro‐IL‐1β by caspase‐1, which is activated by the inflammasome. In addition, caspase‐1 cleaves the cytosolic protein, gasdermin‐D (GSDMD), whose N‐terminal fragment subsequently forms a pore in the plasma membrane, leading to the pyroptic cell‐death‐mediated release of IL‐1β. Living cells can also release IL‐1β via GSDMD pores or other unconventional secretory pathways. However, the precise mechanisms are poorly defined. Here, we show that lipoproteins from Mycoplasma salivarium (MsLP) and Mycoplasma pneumoniae (MpLP) and an M. salivarium‐derived lipopeptide (FSL‐1), which are activators of the nucleotide‐binding oligomerization domain‐like receptor family, pyrin domain containing 3 (NLRP3) inflammasome, induce IL‐1β release from mouse bone‐marrow‐derived macrophages (BMMs) without inducing cell death. The levels of IL‐1β release induced by MsLP, MpLP and FSL‐1 were more than 100 times lower than those induced by the canonical NLRP3 activator nigericin. The IL‐1β release‐inducing activities of MsLP, MpLP and FSL‐1 were not attenuated in BMMs from GSDMD‐deficient mice. Furthermore, both active caspase‐1 and cleaved GSDMD were detected in response to transfection of FSL‐1 into the cytosol of BMMs, but the release of IL‐1β was unaffected by GSDMD deficiency. Meanwhile, punicalagin, a membrane‐stabilizing agent, drastically down‐regulated the release of IL‐1β in response to FSL‐1. These results suggest that mycoplasmal lipoprotein/lipopeptide‐induced IL‐1β release by living macrophages is not mediated via GSDMD but rather through changes in membrane permeability.

中文翻译:

活巨噬细胞响应支原体脂蛋白和脂肽,不依赖 Gasdermin D 释放白细胞介素-1β。

白细胞介素 1 β (IL-1 β ) 在控制细菌感染中起关键作用,它是在由炎症小体激活的 caspase-1处理 pro-IL-1 β 后产生的。此外,caspase-1 裂解胞质蛋白 gasdermin-D (GSDMD),其 N 端片段随后在质膜上形成一个孔,导致热解细胞死亡介导的 IL-1 β释放。活细胞还可以释放IL-1 β经由GSDMD孔或其他非常规分泌途径。然而,精确的机制定义不明确。在这里,我们展示了来自唾液支原体(MsLP) 和肺炎支原体(MpLP) 的脂蛋白以及M. salivarium衍生的脂肽 (FSL-1) 是核苷酸结合寡聚化域样受体家族的激活剂,含有 3 (NLRP3) 炎性体的 pyrin 域,诱导小鼠骨髓衍生巨噬细胞释放IL-1 β (BMMs) 而不会诱导细胞死亡。MsLP、MpLP和FSL-1诱导的IL- 释放水平比经典NLRP3激活剂尼日利亚菌素诱导的水平低100倍以上。在 GSDMD 缺陷小鼠的 BMM 中,MsLP、MpLP 和 FSL-1的 IL-1 β释放诱导活性没有减弱。此外,响应 FSL-1 转染到 BMMs 的细胞质中,检测到活性 caspase-1 和裂解的 GSDMD,但 IL-1 β的释放不受 GSDMD 缺乏的影响。同时,安石榴苷是一种膜稳定剂,可显着下调 IL-1 β的释放以响应 FSL-1。这些结果表明,支原体脂蛋白/脂肽诱导的活巨噬细胞释放IL-1 β不是通过 GSDMD 介导的,而是通过膜通透性的变化介导的。
更新日期:2020-06-26
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