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Inhibition of BET bromodomain attenuates angiotensin II induced abdominal aortic aneurysm in ApoE-/- mice.

Abstract：

BACKGROUND:Excessive degradation of extracellular matrix by matrix metalloproteinases (MMP) is the major pathological feature of abdominal aortic aneurysm (AAA). Suppression of extracellular matrix degradation attenuates AAA initiation and progression in preclinical models. In the present study, we wanted to test the effect of JQ1, a small chemical molecule that selectively targets bromodomain and extra-terminal domain (BET), on AngII induced AAA formation in ApoE-/- mice. METHODS AND RESULTS:To study the role of BET bromodomain in AAA pathogenesis, male ApoE-/- mice were infused with angiotensin II (AngII, 1000ng/kg/min) for 21days and cotreated with JQ1 (50mg/kg daily) or vehicle control (DMSO). In the in vitro study, we determined the mRNA expression of MMP genes by qPCR and their activity both by the kit and gelatin zymography assay. BET bromodomain inhibition resulted in decreased abdominal aortic diameter (P<0.05) measured by in vivo vascular ultrasound and ex vivo pathologic assessment of aortas. In pursuit of mechanisms for this effect on AAA, we observed that JQ1 treatment led to a downregulation of metalloproteinase gene expression and enzymatic activity both in vitro and in vivo. CONCLUSIONS:BET bromodomain inhibition improved AAA pathological sequelae, and this effect might be achieved though suppression of MMP genes expression and their activity.

journal_name

Int J Cardiol

journal_title

International journal of cardiology

authors

Duan Q,Mao X,Liao C,Zhou H,Sun Z,Deng X,Hu Q,Qi J,Zhang G,Huang H,Plutzky J,Yang T

doi

10.1016/j.ijcard.2016.08.238

subject

Has Abstract

pub_date

2016-11-15 00:00:00

pages

428-432

eissn

0167-5273

issn

1874-1754

pii

S0167-5273(16)31946-5

journal_volume

223

pub_type

杂志文章

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