發育活性氧個體化機體抗應激與壽命
作者:
小柯機器人發布時間:2019/12/6 11:13:20
近日,美國密西根大學Ursula Jakob及其研究組發現,發育過程中產生的活性氧使機體的抗應激能力和壽命發生個體化。2019年12月4日,《自然》在線發表了這一成果。
衰老研究的一個主要方面是壽命中何時出現個體性。研究人員表明,在早期發育中的線蟲秀麗隱杆線蟲亞群中自然發生的活性氧(ROS)的瞬時增加,使應激抗逆性增加,改善了氧化還原穩態並最終延長了這些動物的壽命。
研究人員發現這些影響與全局性ROS介導的發育組蛋白H3K4me3水平下降有關。對HeLa細胞的研究證實,總體H3K4me3水平對ROS敏感,並且H3K4me3水平的耗竭會增加哺乳動物細胞的抗逆性。體外研究確定SET1/MLL組蛋白甲基轉移酶是H3K4三甲基化蛋白複合物(COMPASS)的氧化還原敏感單位。這些發現暗示了生命早期事件的聯繫,即在ROS敏感性表觀遺傳標記、抗逆性與壽命之間。
附:英文原文
Title: Developmental ROS individualizes organismal stress resistance and lifespan
Author: Daphne Bazopoulou, Daniela Knoefler, Yongxin Zheng, Kathrin Ulrich, Bryndon J. Oleson, Lihan Xie, Minwook Kim, Anke Kaufmann, Young-Tae Lee, Yali Dou, Yong Chen, Shu Quan, Ursula Jakob
Issue&Volume: 2019-12-04
Abstract: A central aspect of aging research concerns the question of when individuality in lifespan arises1. Here we show that a transient increase in reactive oxygen species (ROS), which occurs naturally during early development in a subpopulation of synchronized Caenorhabditis elegans, sets processes in motion that increase stress resistance, improve redox homeostasis and ultimately prolong lifespan in those animals. We find that these effects are linked to the global ROS-mediated decrease in developmental histone H3K4me3 levels. Studies in HeLa cells confirmed that global H3K4me3 levels are ROS-sensitive and that depletion of H3K4me3 levels increases stress resistance in mammalian cell cultures. In vitro studies identified SET1/MLL histone methyltransferases as redox sensitive units of the H3K4-trimethylating complex of proteins (COMPASS). Our findings implicate a link between early-life events, ROS-sensitive epigenetic marks, stress resistance and lifespan. A subpopulation of Caenorhabditis elegans, in which there is a naturally occurring transient increase in reactive oxygen species during early development, exhibits increased stress resistance, improved redox homeostasis and prolonged lifespan, which are linked to a global decrease in level of the histone mark H3K4me3.
DOI: 10.1038/s41586-019-1814-y
Source:https://www.nature.com/articles/s41586-019-1814-y