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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Cell+Physiol
2015 ; 308
(11
): C869-78
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Noggin inhibits hypoxia-induced proliferation by targeting store-operated calcium
entry and transient receptor potential cation channels
#MMPMID25740156
Yang K
; Lu W
; Jia J
; Zhang J
; Zhao M
; Wang S
; Jiang H
; Xu L
; Wang J
Am J Physiol Cell Physiol
2015[Jun]; 308
(11
): C869-78
PMID25740156
show ga
Abnormally elevated bone morphogenetic protein 4 (BMP4) expression and mediated
signaling play a critical role in the pathogenesis of chronic hypoxia-induced
pulmonary hypertension (CHPH). In this study, we investigated the expression
level and functional significance of four reported naturally occurring BMP4
antagonists, noggin, follistatin, gremlin1, and matrix gla protein (MGP), in the
lung and distal pulmonary arterial smooth muscle cell (PASMC). A 21-day chronic
hypoxic (10% O2) exposure rat model was utilized, which has been previously shown
to successfully establish experimental CHPH. Among the four antagonists, noggin,
but not the other three, was selectively downregulated by hypoxic exposure in
both the lung tissue and PASMC, in correlation with markedly elevated BMP4
expression, suggesting that the loss of noggin might account for the
hypoxia-triggered BMP4 signaling transduction. Then, by using treatment of
extrogenous recombinant noggin protein, we further found that noggin
significantly normalized 1) BMP4-induced phosphorylation of cellular p38 and
ERK1/2; 2) BMP4-induced phosphorylation of cellular JAK2 and STAT3; 3)
hypoxia-induced PASMC proliferation; 4) hypoxia-induced store-operated calcium
entry (SOCE), and 5) hypoxia-increased expression of transient receptor potential
cation channels (TRPC1 and TRPC6) in PASMC. In combination, these data strongly
indicated that the hypoxia-suppressed noggin accounts, at least partially, for
hypoxia-induced excessive PASMC proliferation, while restoration of noggin may be
an effective way to inhibit cell proliferation by suppressing SOCE and TRPC
expression.
|Animals
[MESH]
|Bone Morphogenetic Protein 4/*genetics/metabolism
[MESH]