王宏林團隊揭示銀屑病表皮細胞中存在「自身抗原」
作者:
小柯機器人發布時間:2020/6/18 16:51:21
近日,上海交通大學醫學院王宏林、Florent Ginhoux等研究人員合作發現,角質形成細胞中過多的多胺生成促進銀屑病中樹突狀細胞的自我RNA感應。相關論文於2020年6月17日在線發表在《免疫》雜誌上。
研究人員發現,白細胞介素17(IL-17)下調了銀屑病角質形成細胞中的蛋白磷酸酶6(PP6),導致轉錄因子C /EBP-β的磷酸化和激活,並隨後產生了精氨酸酶1。
角質形成細胞中缺乏Pp6的小鼠易患銀屑病樣皮膚炎症。缺乏Pp6的角質形成細胞中精氨酸酶1的積累促使尿素循環產生多胺。多胺可保護銀屑病角質形成細胞釋放的自身RNA免受降解,並促進髓樣樹突狀細胞對自身RNA的內吞作用,進而促進依賴toll樣受體7(TLR7)的RNA感應和IL-6的產生。精氨酸酶抑制劑改善了銀屑病的鼠類和非人類靈長類動物模型中的皮膚炎症。
這些研究結果表明,銀屑病角質形成細胞中的尿素循環反應過度和過多的多胺生成會促進自我RNA感知,而角質形成細胞中PP6的失調是一個關鍵事件,它會放大銀屑病的炎症迴路。
據悉,銀屑病是一種慢性炎性疾病,其病因是多因素的。細胞代謝對銀屑病的作用尚不清楚。
附:英文原文
Title: Excessive Polyamine Generation in Keratinocytes Promotes Self-RNA Sensing by Dendritic Cells in Psoriasis
Author: Fangzhou Lou, Yang Sun, Zhenyao Xu, Liman Niu, Zhikai Wang, Siyu Deng, Zhaoyuan Liu, Hong Zhou, Jing Bai, Qianqian Yin, Xiaojie Cai, Libo Sun, Hong Wang, Qun Li, Zhouwei Wu, Xiang Chen, Jun Gu, Yu-Ling Shi, Wufan Tao, Florent Ginhoux, Honglin Wang
Issue&Volume: 2020-06-17
Abstract: Psoriasis is a chronic inflammatory disease whose etiology is multifactorial. Thecontributions of cellular metabolism to psoriasis are unclear. Here, we report thatinterleukin-17 (IL-17) downregulated Protein Phosphatase 6 (PP6) in psoriatic keratinocytes,causing phosphorylation and activation of the transcription factor C/EBP-β and subsequentgeneration of arginase-1. Mice lacking Pp6 in keratinocytes were predisposed to psoriasis-likeskin inflammation. Accumulation of arginase-1 in Pp6-deficient keratinocytes drovepolyamine production from the urea cycle. Polyamines protected self-RNA released bypsoriatic keratinocytes from degradation and facilitated the endocytosis of self-RNAby myeloid dendritic cells to promote toll-like receptor-7 (TLR7)-dependent RNA sensingand IL-6 production. An arginase inhibitor improved skin inflammation in murine andnon-human primate models of psoriasis. Our findings suggest that urea cycle hyperreactivityand excessive polyamine generation in psoriatic keratinocytes promote self-RNA sensationand PP6 deregulation in keratinocytes is a pivotal event that amplifies the inflammatorycircuits in psoriasis.
DOI: 10.1016/j.immuni.2020.06.004
Source: https://www.cell.com/immunity/fulltext/S1074-7613(20)30234-X