[HTML][HTML] Regulation of angiotensin II actions by enhancers and super-enhancers in vascular smooth muscle cells

S Das, P Senapati, Z Chen, MA Reddy… - Nature …, 2017 - nature.com
S Das, P Senapati, Z Chen, MA Reddy, R Ganguly, L Lanting, V Mandi, A Bansal, A Leung…
Nature communications, 2017nature.com
Angiotensin II (AngII) promotes hypertension and atherosclerosis by activating growth-
promoting and pro-inflammatory gene expression in vascular smooth muscle cells (VSMCs).
Enhancers and super-enhancers (SEs) play critical roles in driving disease-associated gene
expression. However, enhancers/SEs mediating VSMC dysfunction remain uncharacterized.
Here, we show that AngII alters vascular enhancer and SE repertoires in cultured VSMCs in
vitro, ex vivo, and in AngII-infused mice aortas in vivo. AngII-induced enhancers/SEs are …
Abstract
Angiotensin II (AngII) promotes hypertension and atherosclerosis by activating growth-promoting and pro-inflammatory gene expression in vascular smooth muscle cells (VSMCs). Enhancers and super-enhancers (SEs) play critical roles in driving disease-associated gene expression. However, enhancers/SEs mediating VSMC dysfunction remain uncharacterized. Here, we show that AngII alters vascular enhancer and SE repertoires in cultured VSMCs in vitro, ex vivo, and in AngII-infused mice aortas in vivo. AngII-induced enhancers/SEs are enriched in binding sites for signal-dependent transcription factors and dependent on key signaling kinases. Moreover, CRISPR-Cas9-mediated deletion of candidate enhancers/SEs, targeting SEs with the bromodomain and extra-terminal domain inhibitor JQ1, or knockdown of overlapping long noncoding RNAs (lncRNAs) blocks AngII-induced genes associated with growth-factor signaling and atherosclerosis. Furthermore, JQ1 ameliorates AngII-induced hypertension, medial hypertrophy and inflammation in vivo in mice. These results demonstrate AngII-induced signals integrate enhancers/SEs and lncRNAs to increase expression of genes involved in VSMC dysfunction, and could uncover novel therapies.
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