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2016 ; 76
(ä): 28-36
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The angiotensin receptor blocker losartan reduces coronary arteriole remodeling
in type 2 diabetic mice
#MMPMID26133668
Husarek KE
; Katz PS
; Trask AJ
; Galantowicz ML
; Cismowski MJ
; Lucchesi PA
Vascul Pharmacol
2016[Jan]; 76
(ä): 28-36
PMID26133668
show ga
Cardiovascular complications are a leading cause of morbidity and mortality in
type 2 diabetes mellitus (T2DM) and are associated with alterations of blood
vessel structure and function. Although endothelial dysfunction and aortic
stiffness have been documented, little is known about the effects of T2DM on
coronary microvascular structural remodeling. The renin-angiotensin-aldosterone
system plays an important role in large artery stiffness and mesenteric vessel
remodeling in hypertension and T2DM. The goal of this study was to determine
whether the blockade of AT1R signaling dictates vascular smooth muscle growth
that partially underlies coronary arteriole remodeling in T2DM. Control and db/db
mice were given AT1R blocker losartan via drinking water for 4 weeks. Using
pressure myography, we found that coronary arterioles from 16-week db/db mice
undergo inward hypertrophic remodeling due to increased wall thickness and
wall-to-lumen ratio with a decreased lumen diameter. This remodeling was
accompanied by decreased elastic modulus (decreased stiffness). Losartan
treatment decreased wall thickness, wall-to-lumen ratio, and coronary arteriole
cell number in db/db mice. Losartan treatment did not affect incremental elastic
modulus. However, losartan improved coronary flow reserve. Our data suggest that
Ang II-AT1R signaling mediates, at least in part, coronary arteriole inward
hypertrophic remodeling in T2DM without affecting vascular mechanics, further
suggesting that targeting the coronary microvasculature in T2DM may help reduce
cardiac ischemic events.