蛋白質異戊二烯化調控效應Treg細胞的分化和維持
作者:
小柯機器人發布時間:2020/11/19 13:11:05
美國聖猶大兒童研究醫院Hongbo Chi研究小組發現,蛋白質異戊二烯化調控效應Treg細胞的分化和維持。這一研究成果於2020年11月17日在線發表在國際學術期刊《細胞—代謝》上。
研究人員發現,類異戊二烯依賴的翻譯後脂質修飾通過與T細胞受體(TCR)誘導的細胞內信號來決定效應調節性T(eTreg)細胞的積累和功能。研究人員發現類異戊二烯對於活化Treg細胞的抑制活性是必不可少的,並且Treg細胞特異性缺失相應的法尼基化和香葉醯香葉醯化促進Fntb或Pggt1b導致致命的自身免疫性發展,並與eTreg細胞積聚減少有關。
從機制上講,Fntb通過調節mTORC1活性和ICOS表達來促進eTreg細胞的維持。相比之下,Pggt1b充當TCR依賴的轉錄程序和Rac介導的變阻器,用於建立eTreg細胞的分化和免疫耐受。因此,這些結果確定了雙向代謝信號,特別是免疫受體信號和代謝介導的翻譯後脂質修飾之間的雙向代謝信號,從而可用於eTreg細胞的分化和維持。
據了解,eTreg細胞對於免疫耐受至關重要,並且依賴於TCR信號的產生。尚不清楚促進eTreg細胞分化和維持的免疫代謝信號傳導機制。
附:英文原文
Title: Protein Prenylation Drives Discrete Signaling Programs for the Differentiation and Maintenance of Effector Treg Cells
Author: Wei Su, Nicole M. Chapman, Jun Wei, Hu Zeng, Yogesh Dhungana, Hao Shi, Jordy Saravia, Peipei Zhou, Lingyun Long, Sherri Rankin, Anil KC, Peter Vogel, Hongbo Chi
Issue&Volume: 2020-11-17
Abstract: Effector regulatory T (eTreg) cells are essential for immune tolerance and depend upon T cell receptor (TCR) signalsfor generation. The immunometabolic signaling mechanisms that promote the differentiationand maintenance of eTreg cells remain unclear. Here, we show that isoprenoid-dependent posttranslational lipidmodifications dictate eTreg cell accumulation and function by intersecting with TCR-induced intracellular signaling.We find that isoprenoids are essential for activated Treg cell suppressive activity, and Treg cell-specific deletion of the respective farnesylation- and geranylgeranylation-promotingenzymes Fntb or Pggt1b leads to the development of fatal autoimmunity, associatedwith reduced eTreg cell accumulation. Mechanistically, Fntb promotes eTreg cell maintenance by regulating mTORC1 activity and ICOS expression. In contrast,Pggt1b acts as a rheostat of TCR-dependent transcriptional programming and Rac-mediatedsignaling for establishment of eTreg cell differentiation and immune tolerance. Therefore, our results identify bidirectionalmetabolic signaling, specifically between immunoreceptor signaling and metabolism-mediatedposttranslational lipid modifications, for the differentiation and maintenance ofeTreg cells.
DOI: 10.1016/j.cmet.2020.10.022
Source: https://www.cell.com/cell-metabolism/fulltext/S1550-4131(20)30591-X