Hydrocortisone inhibits cellular proliferation by downregulating hepatocyte growth factor synthesis in human osteoblasts.

Abstract:

:Glucocorticoids have multiple systemic effects that may influence bone metabolism but also directly affect osteoblasts by decreasing their proliferation. Using human osteoblastic SaM-1 cells, we examined whether the effects of hydrocortisone on cellular proliferation are mediated by hepatocyte growth factor (HGF). Human osteoblasts constitutively express both HGF and c-Met, its receptor. Hydrocortisone decreased the gene and protein expression of HGF as well as proliferation in SaM-1 cells. These hydrocortisone (0.01-1 µM)-induced decreases in HGF synthesis and cellular proliferation occurred in a concentration-dependent manner. However, no hydrocortisone (0.01-1 µM)-induced decrease in cellular proliferation was observed in human osteosarcoma-derived cells (HOS and SaOS-2), which are not able to produce HGF. In the cellular proliferation in SaM-1 cells, the decrease was blocked concentration-dependently by exogenously applied HGF (0.01-3 ng/ml). Furthermore, SU11274 (1 µM), a highly specific inhibitor of c-Met, suppressed the proliferation of SaM-1 cells, but not HOS cells. From these results, we concluded that hydrocortisone inhibits the proliferation of SaM-1 cells by interrupting the autocrine/paracrine loop via the downregulation of HGF synthesis.

journal_name

Biol Pharm Bull

authors

Tsunashima Y,Kondo A,Matsuda T,Togari A

doi

10.1248/bpb.34.700

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

700-3

issue

5

eissn

0918-6158

issn

1347-5215

pii

JST.JSTAGE/bpb/34.700

journal_volume

34

pub_type

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