Glucocorticoid suppresses the canonical Wnt signal in cultured human osteoblasts.

Abstract:

:To explore the mechanism of glucocorticoid-induced osteoporosis, we investigated the effect of glucocorticoid on canonical Wnt signaling that emerged as a novel key pathway for promoting bone formation. Wnt3a increased the T-cell factor (Tcf)/lymphoid enhancer factor (Lef)-dependent transcriptional activity in primary cultured human osteoblasts. Dexamethasone suppressed this transcriptional activity in a dose-dependent manner, while 1,25-dihydroxyvitamin D3 increased this transcriptional activity. LiCl, an inhibitor of glycogen synthase kinase-3beta, also enhanced the Tcf/Lef-dependent transcriptional activity, which was, however, not inhibited by dexamethasone. The addition of anti-dickkopf-1 antibody partially restored the transcriptional activity suppressed by dexamethasone. Dexamethasone decreased the cytosolic amount of beta-catenin accumulated by Wnt3a and also inhibited the nuclear translocation of beta-catenin induced by Wnt3a. These data suggest that glucocorticoid suppresses the canonical Wnt signal in cultured human osteoblasts, partially through the enhancement of the dickkopf-1 production.

authors

Ohnaka K,Tanabe M,Kawate H,Nawata H,Takayanagi R

doi

10.1016/j.bbrc.2005.01.117

subject

Has Abstract

pub_date

2005-04-01 00:00:00

pages

177-81

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)00184-1

journal_volume

329

pub_type

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