Journal
EUROPEAN HEART JOURNAL
Volume 40, Issue 4, Pages 383-391Publisher
OXFORD UNIV PRESS
DOI: 10.1093/eurheartj/ehx615
Keywords
Epigenetics; Chromatin remodelling; Vascular disease; Oxidative stress; Endothelial dysfunction; Obesity
Categories
Funding
- Vetenskapradet [2016-02706]
- Konung Gustaf V: s och Drottning Victorias Frimurarestiftelse
- Swedish Heart-Lung Foundation
- EFSD/Novo Nordisk Award
- Italian Ministry of Education, University and Research, PRIN
- Center for Gender Medicine
- Holcim Stiftung
- Jubilaumsstiftung (Swiss Life)
- Foundation for Cardiovascular Research (Zurich Heart House, Zurich Switzerland)
- Swiss National Research Foundation [310030-135815]
- Sheikh Khalifa's Foundation Assistant Professorship at the Faculty of Medicine, University of Zurich
- Swiss National Science Foundation (SNF) [310030_135815] Funding Source: Swiss National Science Foundation (SNF)
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Aims Accumulation of reactive oxygen species (ROS) promotes vascular disease in obesity, but the underlying molecular mechanisms remain poorly understood. The adaptor p66(Shc) is emerging as a key molecule responsible for ROS generation and vascular damage. This study investigates whether epigenetic regulation of p66(Shc) contributes to obesity-related vascular disease. Methods and results ROS-driven endothelial dysfunction was observed in visceral fat arteries (VFAs) isolated from obese subjects when compared with normal weight controls. Gene profiling of chromatin-modifying enzymes in VFA revealed a significant dysregulation of methyltransferase SUV39H1 (fold change, -6.9, P<0.01), demethylase JMJD2C (fold change, 3.2, P<0.01), and acetyltransferase SRC-1 (fold change, 5.8, P<0.01) in obese vs. control VFA. These changes were associated with reduced di-(H3K9me2) and trimethylation (H3K9me3) as well as acetylation (H3K9ac) of histone 3 lysine 9 (H3K9) on p66(Shc) promoter. Reprogramming SUV39H1, JMJD2C, and SRC-1 in isolated endothelial cells as well as in aortas from obese mice (Lep(Ob/Ob)) suppressed p66(Shc)-derived ROS, restored nitric oxide levels, and rescued endothelial dysfunction. Consistently, in vivo editing of chromatin remodellers blunted obesity-related vascular p66(Shc) expression. We show that SUV39H1 is the upstream effector orchestrating JMJD2C/SRC-1 recruitment to p66(Shc) promoter. Indeed, SUV39H1 overexpression in obese mice erased H3K9-related changes on p66(Shc) promoter, while SUV39H1 genetic deletion in lean mice recapitulated obesity-induced H3K9 remodelling and p66(Shc) transcription. Conclusion These results uncover a novel epigenetic mechanism underlying endothelial dysfunction in obesity. Targeting SUV39H1 may attenuate oxidative transcriptional programmes and thus prevent vascular disease in obese individuals.
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