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2017 ; 70
(1
): 174-182
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Hypertension-Causing Mutation in Peroxisome Proliferator-Activated Receptor ?
Impairs Nuclear Export of Nuclear Factor-?B p65 in Vascular Smooth Muscle
#MMPMID28507170
Mukohda M
; Lu KT
; Guo DF
; Wu J
; Keen HL
; Liu X
; Ketsawatsomkron P
; Stump M
; Rahmouni K
; Quelle FW
; Sigmund CD
Hypertension
2017[Jul]; 70
(1
): 174-182
PMID28507170
show ga
Selective expression of dominant negative (DN) peroxisome proliferator-activated
receptor ? (PPAR?) in vascular smooth muscle cells (SMC) results in hypertension,
atherosclerosis, and increased nuclear factor-?B (NF-?B) target gene expression.
Mesenteric SMC were cultured from mice designed to conditionally express
wild-type (WT) or DN-PPAR? in response to Cre recombinase to determine how SMC
PPAR? regulates expression of NF-?B target inflammatory genes. SMC-specific
overexpression of WT-PPAR? or agonist-induced activation of endogenous PPAR?
blunted tumor necrosis factor ? (TNF-?)-induced NF-?B target gene expression and
activity of an NF-?B-responsive promoter. TNF-?-induced gene expression responses
were enhanced by DN-PPAR? in SMC. Although expression of NF-?B p65 was unchanged,
nuclear export of p65 was accelerated by WT-PPAR? and prevented by DN-PPAR? in
SMC. Leptomycin B, a nuclear export inhibitor, blocked p65 nuclear export and
inhibited the anti-inflammatory action of PPAR?. Consistent with a role in
facilitating p65 nuclear export, WT-PPAR? coimmunoprecipitated with p65, and
WT-PPAR? was also exported from the nucleus after TNF-? treatment. Conversely,
DN-PPAR? does not bind to p65 and was retained in the nucleus after TNF-?
treatment. Transgenic mice expressing WT-PPAR? or DN-PPAR? specifically in SMC
(S-WT or S-DN) were bred with mice expressing luciferase controlled by an
NF-?B-responsive promoter to assess effects on NF-?B activity in whole tissue.
TNF-?-induced NF-?B activity was decreased in aorta and carotid artery from S-WT
but was increased in vessels from S-DN mice. We conclude that SMC PPAR? blunts
expression of proinflammatory genes by inhibition of NF-?B activity through a
mechanism promoting nuclear export of p65, which is abolished by DN mutation in
PPAR?.