Macrophage-stimulating protein (MSP) and its receptor, RON, stimulate human osteoclast activity but not proliferation: Effect of MSP distinct from that of hepatocyte growth factor

N. Kurihara, J. Tatsumi, F. Arai, A. Iwama, T. Suda

研究成果: Contribution to journalArticle査読

24 被引用数 (Scopus)

抄録

Stem cell-derived tyrosine kinase (STK) is a member of the hepatocyte growth factor (HGF) receptor family. The ligand for STK, macrophage- stimulating protein (MSP), is a serum protein activated by members of the coagulation cascade. The RON gene is a human homolog of the murine STK. In this study we examined the role of MSP-RON in the signal pathway of human osteoclasts. Using anti-RON antibody, we detected RON expressed in multinucleated osteoclast-like cells (OCLs) formed in cultures of human bone marrow cells. To determine bone resorption, we placed OCLs on thin films of ceramic calcium phosphate formed on quartz plate-coated slides (Millenium Biologix) and measured pit formation. MSP stimulated pit formation by OCLs in a dose-dependent manner. MSP (50 ng/mL) caused a fourfold increase in pit area compared with the control. Furthermore, we examined the effects of MSP and HGF on OCL formation by purified populations of hematopoietic progenitors. OCLs were phenotypically identified by their cross-reactivity with 23c6, a monoclonal antibody that preferentially binds to osteoclasts. HGF (50 ng/mL) stimulated the differentiation of progenitors to 23c6-positive OCLs but did not enhance bone absorption. In contrast, MSP did not affect proliferation of osteoclast precursors but stimulated bone resorption by OCLs. We conclude that the MSP signal transduction pathway plays a role in bone resorption that is distinct from that of HGF.

本文言語英語
ページ(範囲)1080-1085
ページ数6
ジャーナルExperimental Hematology
26
11
出版ステータス出版済み - 1998
外部発表はい

All Science Journal Classification (ASJC) codes

  • 分子生物学
  • 血液学
  • 遺伝学
  • 細胞生物学
  • 癌研究

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