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2015 ; 239
(2
): 557-65
Nephropedia Template TP
gab.com Text
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English Wikipedia
Inhibition of soluble epoxide hydrolase in mice promotes reverse cholesterol
transport and regression of atherosclerosis
#MMPMID25733327
Shen L
; Peng H
; Peng R
; Fan Q
; Zhao S
; Xu D
; Morisseau C
; Chiamvimonvat N
; Hammock BD
Atherosclerosis
2015[Apr]; 239
(2
): 557-65
PMID25733327
show ga
Adipose tissue is the body largest free cholesterol reservoir and abundantly
expresses ATP binding cassette transporter A1 (ABCA1), which maintains plasma
high-density lipoprotein (HDL) levels. HDLs have a protective role in
atherosclerosis by mediating reverse cholesterol transport (RCT). Soluble epoxide
hydrolase (sEH) is a cytosolic enzyme whose inhibition has various beneficial
effects on cardiovascular disease. The sEH is highly expressed in adipocytes, and
it converts epoxyeicosatrienoic acids (EETs) into less bioactive
dihydroxyeicosatrienoic acids. We previously showed that increasing EETs levels
with a sEH inhibitor (sEHI) (t-AUCB) resulted in elevated ABCA1 expression and
promoted ABCA1-mediated cholesterol efflux from 3T3-L1 adipocytes. The present
study investigates the impacts of t-AUCB in mice deficient for the low density
lipoprotein (LDL) receptor (Ldlr(-/-) mice) with established atherosclerotic
plaques. The sEH inhibitor delivered in vivo for 4 weeks decreased the activity
of sEH in adipose tissue, enhanced ABCA1 expression and cholesterol efflux from
adipose depots, and consequently increased HDL levels. Furthermore, t-AUCB
enhanced RCT to the plasma, liver, bile and feces. It also showed the reduction
of plasma LDL-C levels. Consistently, t-AUCB-treated mice showed reductions in
the size of atherosclerotic plaques. These studies establish that raising adipose
ABCA1 expression, cholesterol efflux, and plasma HDL levels with t-AUCB treatment
promotes RCT, decreasing LDL-C and atherosclerosis regression, suggesting that
sEH inhibition may be a promising strategy to treat atherosclerotic vascular
disease.