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2015 ; 10
(7
): e0133391
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PPAR? Ligands Attenuate Hypoxia-Induced Proliferation in Human Pulmonary Artery
Smooth Muscle Cells through Modulation of MicroRNA-21
#MMPMID26208095
Green DE
; Murphy TC
; Kang BY
; Searles CD
; Hart CM
PLoS One
2015[]; 10
(7
): e0133391
PMID26208095
show ga
Pulmonary hypertension (PH) is a progressive and often fatal disorder whose
pathogenesis involves pulmonary artery smooth muscle cell (PASMC) proliferation.
Although modern PH therapies have significantly improved survival, continued
progress rests on the discovery of novel therapies and molecular targets.
MicroRNA (miR)-21 has emerged as an important non-coding RNA that contributes to
PH pathogenesis by enhancing vascular cell proliferation, however little is known
about available therapies that modulate its expression. We previously
demonstrated that peroxisome proliferator-activated receptor gamma (PPAR?)
agonists attenuated hypoxia-induced HPASMC proliferation, vascular remodeling and
PH through pleiotropic actions on multiple targets, including transforming growth
factor (TGF)-?1 and phosphatase and tensin homolog deleted on chromosome 10
(PTEN). PTEN is a validated target of miR-21. We therefore hypothesized that
antiproliferative effects conferred by PPAR? activation are mediated through
inhibition of hypoxia-induced miR-21 expression. Human PASMC monolayers were
exposed to hypoxia then treated with the PPAR? agonist, rosiglitazone (RSG,10
?M), or in parallel, C57Bl/6J mice were exposed to hypoxia then treated with RSG.
RSG attenuated hypoxic increases in miR-21 expression in vitro and in vivo and
abrogated reductions in PTEN and PASMC proliferation. Antiproliferative effects
of RSG were lost following siRNA-mediated PTEN depletion. Furthermore, miR-21
mimic decreased PTEN and stimulated PASMC proliferation, whereas miR-21
inhibition increased PTEN and attenuated hypoxia-induced HPASMC proliferation.
Collectively, these results demonstrate that PPAR? ligands regulate proliferative
responses to hypoxia by preventing hypoxic increases in miR-21 and reductions in
PTEN. These findings further clarify molecular mechanisms that support targeting
PPAR? to attenuate pathogenic derangements in PH.