Regulation of tenascin-C expression in bone cells by transforming growth factor-β

E. J. MacKie, L. A. Abraham, S. L. Taylor, Richard P Tucker, L. I. Murphy

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Transforming growth factor-β (TGF-β) stimulates new bone formation when administered locally in vivo. The extracellular matrix protein tenascin-C, which is secreted by osteoblasts but absent from mineralized bone matrix, supports differentiation of cultured osteoblast-like cells. The current study was undertaken to determine whether expression patterns of tenascin-C in TGF-β-treated bone cells are in agreement with a role for this protein as a mediator of TGF-β-stimulated new bone formation. Expression of tenascin-C was investigated by immunohistochemistry in calvarial bones of mice to which TGF-β had been locally administered. Three days after initiation of daily TGF-β treatment, strong staining for tenascin-C was seen in regions where periosteal osteoprogenitor cells were undergoing proliferation in response to TGF-β; by comparison, staining of periosteal surfaces of control bones was weak and discontinuous. Seven days after initiation of a course of five daily injections of TGF-β, tenascin-C staining was still enhanced in treated bones. The ability of TGF-β to regulate expression of tenascin-C in osteoblast-like cells in vitro was investigated using an osteosarcoma-derived cell line (ROS 17/2.8). TGF-β caused a small but significant increase in secretion of tenascin-C into the medium, as determined by a solid phase dot immunoassay quantitated by densitometry. Western and northern blot analysis indicated that TGF-β did not influence the pattern of expression of tenascin-C splice variants. These results indicate that TGF-β stimulates osteoblastic tenascin-C expression and suggest that tenascin-C may act as a mediator of TGF-β-induced new bone formation.

Original languageEnglish (US)
Pages (from-to)301-307
Number of pages7
JournalBone
Volume22
Issue number4
DOIs
StatePublished - Apr 1998

Keywords

  • Bone
  • Extrucellular matrix
  • Osteoblast
  • Tenascin-C
  • Transforming growth factor-β

ASJC Scopus subject areas

  • Physiology
  • Hematology

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