gasdermin D通過誘導凝集素釋放促進炎症發生
作者:
小柯機器人發布時間:2021/1/6 16:35:51
美國康乃狄克大學醫學院Vijay A. Rathinam及其課題組揭示了細胞內免疫感應通過gasdermin D蛋白誘導凝集素釋放促進炎症發生。 該研究於2021年1月4日發表《自然-免疫學》雜誌。
研究人員利用蛋白質組學發現,感知胞質脂多糖(LPS)導致半乳糖凝集素-β(與半乳糖苷結合的凝集素)的釋放。Galectin-1釋放是細胞壞死等炎性細胞死亡的常見特徵。對半乳糖凝集素-1缺陷小鼠、體內重組半乳糖凝集素-1和半乳糖凝集素-1中和抗體的研究表明,半乳糖凝集素-1促進炎症發生並在LPS導致的死亡過程中起有害作用。從機理上講,galectin-1對CD45(Ptprc)的抑制作用是其在內毒素休克中發揮有害作用的基礎。
最後,研究發現人敗血症患者血清中的半乳糖凝集素-1增加。總體而言,該發現表明galectin-1是由胞質感知LPS而釋放的真正損傷相關分子模式(DAMP),從而確定了炎症細胞死亡的新機制。
據了解,炎性含半胱氨酸的天冬氨酸蛋白水解酶(caspase)感知胞質LPS引發細胞焦亡,同時釋放DAMP。總體而言,DAMP是決定炎症細胞死亡的關鍵決定因素。但是,尚不清楚單個DAMP釋放的特性和功能。
附:英文原文
Title: Intracellular immune sensing promotes inflammation via gasdermin D–driven release of a lectin alarmin
Author: Ashley J. Russo, Swathy O. Vasudevan, Santiago P. Mndez-Huergo, Puja Kumari, Antoine Menoret, Shivalee Duduskar, Chengliang Wang, Juan M. Prez Sez, Margaret M. Fettis, Chuan Li, Renjie Liu, Arun Wanchoo, Karthik Chandiran, Jianbin Ruan, Sivapriya Kailasan Vanaja, Michael Bauer, Christoph Sponholz, Gregory A. Hudalla, Anthony T. Vella, Beiyan Zhou, Sachin D. Deshmukh, Gabriel A. Rabinovich, Vijay A. Rathinam
Issue&Volume: 2021-01-04
Abstract: Inflammatory caspase sensing of cytosolic lipopolysaccharide (LPS) triggers pyroptosis and the concurrent release of damage-associated molecular patterns (DAMPs). Collectively, DAMPs are key determinants that shape the aftermath of inflammatory cell death. However, the identity and function of the individual DAMPs released are poorly defined. Our proteomics study revealed that cytosolic LPS sensing triggered the release of galectin-1, a β-galactoside-binding lectin. Galectin-1 release is a common feature of inflammatory cell death, including necroptosis. In vivo studies using galectin-1-deficient mice, recombinant galectin-1 and galectin-1-neutralizing antibody showed that galectin-1 promotes inflammation and plays a detrimental role in LPS-induced lethality. Mechanistically, galectin-1 inhibition of CD45 (Ptprc) underlies its unfavorable role in endotoxin shock. Finally, we found increased galectin-1 in sera from human patients with sepsis. Overall, we uncovered galectin-1 as a bona fide DAMP released as a consequence of cytosolic LPS sensing, identifying a new outcome of inflammatory cell death.
DOI: 10.1038/s41590-020-00844-7
Source: https://www.nature.com/articles/s41590-020-00844-7