TREML4受體調節炎症和先天免疫細胞的凋亡
作者:
小柯機器人發布時間:2020/10/8 22:14:01
在細菌性敗血症個體中TREML4受體調節炎症和先天免疫細胞凋亡,這一研究成果由澳大利亞樂卓博大學Hamsa Puthalakath小組經過不懈努力而取得。該研究成果於2020年10月5日發表在國際學術期刊《自然-免疫學》上。
通過對小鼠進行全基因組CRISPR篩選,研究人員發現髓樣細胞(TREM)家族受體TREML4的激活是敗血症炎症和免疫細胞死亡的關鍵調節因子。在小鼠中敲除Treml4表明TREML4調節先天免疫細胞的鈣穩態、炎性細胞因子反應、髓過氧化物酶激活、內質網應激反應和細胞凋亡;並且在急性和慢性細菌敗血症感染時提高總體存活率。
據悉,敗血症是一種雙相性疾病,其特徵是急性炎症反應並伴隨長時間的免疫抑制。抑制炎症的療法有助於減少敗血症患者在重症監護室的時間,但並不能降低總死亡率。近來,治療該疾病的重心轉移到解決由免疫細胞凋亡引起的免疫抑制階段。但是,尚不清楚該反應發生的分子機制。
附:英文原文
Title: TREML4 receptor regulates inflammation and innate immune cell death during polymicrobial sepsis
Author: Christina Nedeva, Joseph Menassa, Mubing Duan, Chuanxin Liu, Marcel Doerflinger, Andrew J. Kueh, Marco J. Herold, Pamali Fonseka, Thanh Kha Phan, Pierre Faou, Harinda Rajapaksha, Weisan Chen, Mark D. Hulett, Hamsa Puthalakath
Issue&Volume: 2020-10-05
Abstract: Sepsis is a biphasic disease characterized by an acute inflammatory response, followed by a prolonged immunosuppressive phase. Therapies aimed at controlling inflammation help to reduce the time patients with sepsis spend in intensive care units, but they do not lead to a reduction in overall mortality. Recently, the focus has been on addressing the immunosuppressive phase, often caused by apoptosis of immune cells. However, molecular triggers of these events are not yet known. Using whole-genome CRISPR screening in mice, we identified a triggering receptor expressed on myeloid cells (TREM) family receptor, TREML4, as a key regulator of inflammation and immune cell death in sepsis. Genetic ablation of Treml4 in mice demonstrated that TREML4 regulates calcium homeostasis, the inflammatory cytokine response, myeloperoxidase activation, the endoplasmic reticulum stress response and apoptotic cell death in innate immune cells, leading to an overall increase in survival rate, both during the acute and chronic phases of polymicrobial sepsis. Sepsis is a biphasic disease characterized by an initial inflammatory phase, followed by a prolonged immunosuppression phase. Puthalakath and colleagues utilize a CRISPR-mediated mutagenesis screen to identify TREML4 as a regulator of sepsis-induced immunosuppression.
DOI: 10.1038/s41590-020-0789-z
Source: https://www.nature.com/articles/s41590-020-0789-z