The G-protein-coupled receptor GPR103 regulates bone formation.

Abstract:

:GPR103 is a G-protein-coupled receptor with reported expression in brain, heart, kidney, adrenal gland, retina, and testis. It encodes a 455-amino-acid protein homologous to neuropeptide FF2, neuropeptide Y2, and galanin GalR1 receptors. Its natural ligand was recently identified as 26RFa, a novel human RF-amide-related peptide with orexigenic activity. To identify the function of GPR103, we generated GPR103-deficient mice. Homozygous mutant mice were viable and fertile. Their body weight was undistinguishable from that of their wild-type littermates. Histological analysis revealed that GPR103-/- mice exhibited a thinned osteochondral growth plate, a thickening of trabecular branches, and a reduction in osteoclast number, suggestive of an early arrest of osteochondral bone formation. Microcomputed tomography confirmed the reduction in trabecular bone and connective tissue densities in GPR103 knockout animals. Whole-body radiography followed by morphometric analysis revealed a kyphosis in mutant animals. Reverse transcription-PCR analysis showed that GPR103 was expressed in human skull, mouse spine, and several osteoblast cell lines. Dexamethasone, a known inhibitor of osteoblast growth and inducer of osteoblast differentiation, inhibited GPR103 expression in human osteoblast primary cultures. Altogether, these results suggest that osteopenia in GPR103-/- mice may be mediated directly by the loss of GPR103 expression in bone.

journal_name

Mol Cell Biol

authors

Baribault H,Danao J,Gupte J,Yang L,Sun B,Richards W,Tian H

doi

10.1128/MCB.26.2.709-717.2006

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

709-17

issue

2

eissn

0270-7306

issn

1098-5549

pii

26/2/709

journal_volume

26

pub_type

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