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Involvement of the G-protein-coupled receptor 4 in RANKL expression by osteoblasts in an acidic environment.

Abstract：

:Osteoclast activity is enhanced in acidic environments following systemic or local inflammation. However, the regulatory mechanism of receptor activator of NF-κB ligand (RANKL) expression in osteoblasts under acidic conditions is not fully understood. In the present paper, we detected the mRNA expression of the G-protein-coupled receptor (GPR) proton sensors GPR4 and GPR65 (T-cell death-associated gene 8, TDAG8), in osteoblasts. RANKL expression and the cyclic AMP (cAMP) level in osteoblasts were up-regulated under acidic culture conditions. Acidosis-induced up-regulation of RANKL was abolished by the protein kinase A inhibitor H89. To clarify the role of GPR4 in RANKL expression, GPR4 gain and loss of function experiments were performed. Gene knockdown and forced expression of GPR4 caused reduction and induction of RANKL expression, respectively. These results suggested that, at least in part, RANKL expression by osteoblasts in an acidic environment was mediated by cAMP/PKA signaling resulting from GPR4 activation. A comprehensive microarray analysis of gene expression of osteoblasts revealed that, under acidic conditions, the phenotype of osteoblasts was that of an osteoclast supporting cell rather than that of a mineralizing cell. These findings will contribute to a molecular understanding of bone disruption in an acidic environment.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Okito A,Nakahama K,Akiyama M,Ono T,Morita I

doi

10.1016/j.bbrc.2015.01.142

subject

Has Abstract

pub_date

2015-03-06 00:00:00

pages

435-40

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(15)00189-8

journal_volume

458

pub_type

杂志文章

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