阻斷p38 MAPK的升高可改善老年人的免疫反應
作者:
小柯機器人發布時間:2020/4/10 10:28:58
英國倫敦大學Derek W. Gilroy小組在研究中取得進展。他們發現阻止p38絲裂原激活的蛋白激酶(MAPK)升高可以幫助老年人恢復紅細胞增長和炎症消退。相關論文於2020年4月6日在線發表在《自然-免疫學》雜誌上
使用人類皮膚急性炎症模型,研究人員發現儘管年輕人和老年人之間有相似的炎症發生階段,但是老年人的炎症分型性階段受到了嚴重損害。這是由T細胞免疫球蛋白粘蛋白受體4(TIM-4)減少引起的,TIM-4是表達在巨噬細胞上的磷脂醯絲氨酸受體,能夠吞噬凋亡小體,即所謂的胞吞作用。老年個體TIM-4的減少是由巨噬細胞p38 MAPK活性升高造成的。
老年個體口服活性p38抑制劑可挽救TIM-4的表達、清除凋亡小體並恢復巨噬細胞分型。因此,抑制老年人的p38可以恢復其分型活力,使該階段與年輕人更為相似。這是人類中鑑定的第一個分型缺陷並可以被成功逆轉,從而凸顯了將靶向分型生物學作為治療慢性炎症造成疾病的潛能。
研究人員表示,年齡的增加會改變先天免疫介導的反應;但是,尚不完全清楚人類發生這些變化的基礎機制。
附:英文原文
Title: Blocking elevated p38 MAPK restores efferocytosis and inflammatory resolution in the elderly
Author: Roel P. H. De Maeyer, Rachel C. van de Merwe, Rikah Louie, OliviaV. Bracken, Oliver P. Devine, Daniel R. Goldstein, Mohib Uddin, Arne N. Akbar, Derek W. Gilroy
Issue&Volume: 2020-04-06
Abstract: Increasing age alters innate immune–mediated responses; however, the mechanisms underpinning these changes in humans are not fully understood. Using a human dermal model of acute inflammation, we found that, although inflammatory onset is similar between young and elderly individuals, the resolution phase was substantially impaired in elderly individuals. This arose from a reduction in T cell immunoglobulin mucin receptor-4 (TIM-4), a phosphatidylserine receptor expressed on macrophages that enables the engulfment of apoptotic bodies, so-called efferocytosis. Reduced TIM-4 in elderly individuals was caused by an elevation in macrophage p38 mitogen-activated protein kinase (MAPK) activity. Administering an orally active p38 inhibitor to elderly individuals rescued TIM-4 expression, cleared apoptotic bodies and restored a macrophage resolution phenotype. Thus, inhibiting p38 in elderly individuals rejuvenated their resolution response to be more similar to that of younger people. This is the first resolution defect identified in humans that has been successfully reversed, thereby highlighting the tractability of targeting pro-resolution biology to treat diseases driven by chronic inflammation.
DOI: 10.1038/s41590-020-0646-0
Source: https://www.nature.com/articles/s41590-020-0646-0