脂肪細胞缺氧誘導因子2α可抑制動脈粥樣硬化
作者:
小柯機器人發布時間:2019/10/25 16:27:55
近日,北京大學姜長濤(Changtao Jiang)及其研究團隊發現,脂肪細胞低氧誘導因子2α(HIF-2α)通過促進脂肪神經醯胺分解代謝來抑制動脈粥樣硬化。該項研究成果10月24日在線發表於《細胞—代謝》雜誌。
研究人員發現,在16°C的輕微寒冷接觸後,脂肪細胞HIF-2α上調並介導了冷引起的生熱作用。脂肪細胞HIF-2α缺乏通過增加脂肪神經醯胺水平而加劇了西方飲食引起的動脈粥樣硬化,從而削弱了肝細胞膽固醇的清除和生熱作用。從機制上講,編碼鹼性神經醯胺酶2的基因Acer2被鑑定為HIF-2α的新靶基因,觸發了神經醯胺分解代謝。脂肪過表達ACER2可以拯救脂肪細胞HIF-2α缺乏所致的動脈粥樣硬化加重。
此外,HIF脯氨醯羥化酶抑制劑FG-4592激活脂肪HIF-2α對動脈粥樣硬化具有保護作用,並伴有脂肪、血漿神經醯胺和血漿膽固醇水平的降低。這項研究表明脂肪細胞HIF-2α可作為治療動脈粥樣硬化的潛在藥物靶標。
據介紹,肥胖引起的脂肪功能障礙是導致動脈粥樣硬化的主要因素。據報導,接觸寒冷可通過調節脂肪功能來影響動脈粥樣硬化,但其機理尚不清楚。
附:英文原文
Title: Adipocyte Hypoxia-Inducible Factor 2α Suppresses Atherosclerosis by Promoting Adipose Ceramide Catabolism
Author: Xingzhong Zhang, Yangming Zhang, Pengcheng Wang, Song-Yang Zhang, Yongqiang Dong, Guangyi Zeng, Yu Yan, Lulu Sun, Qing Wu, Huiying Liu, Bo Liu, Wei Kong, Xian Wang, Changtao Jiang
Issue&Volume: 2019/10/24
Abstract: Obesity-induced adipose dysfunction is a major contributor to atherosclerosis. Cold exposure has been reported to affect atherosclerosis through regulation of adipose function, but the mechanism has not been well clarified. Here, adipocyte hypoxia-inducible factor 2α (HIF-2α) was upregulated after mild cold exposure at 16°C and mediated cold-induced thermogenesis. Adipocyte HIF-2α deficiency exacerbated Western-diet-induced atherosclerosis by increasing adipose ceramide levels, which blunted hepatocyte cholesterol elimination and thermogenesis. Mechanistically, Acer2, the gene encoding alkaline ceramidase 2, was identified as a novel target gene of HIF-2α, triggering ceramide catabolism. Adipose overexpression of ACER2 rescued adipocyte HIF-2α-deficiency-induced exacerbation of atherosclerosis. Furthermore, activation of adipose HIF-2α by the HIF prolyl hydroxylase inhibitor FG-4592 had protective effects on atherosclerosis, accompanied by a reduction in adipose and plasma ceramide and plasma cholesterol levels. This study highlights adipocyte HIF-2α as a putative drug target against atherosclerosis.
DOI: 10.1016/j.cmet.2019.09.016
Source: https://www.cell.com/cell-metabolism/fulltext/S1550-4131(19)30555-8