Interaction of osteogenin, a heparin binding bone morphogenetic protein, with type IV collagen

Vishwas M. Paralkar, Arvind K N Nandedkar, Richard H. Pointer, Hynda K. Kleinman, A Hari Reddi

Research output: Contribution to journalArticle

147 Scopus citations

Abstract

Osteogenin, an extracellular matrix component of bone, is a heparin binding differentiation factor that initiates endochondral bone formation in rats when implanted subcutaneously with an insoluble collagenous matrix. We have examined the interaction of osteogenin with various extracellular matrix components including basement membranes. Osteogenin, purified from bovine bone, binds avidly to type IV collagen and to a lesser extent to both type I and IX collagens. Osteogenin binds equally well to both native and denatured type IV collagen. Both α1 and α2 chains of type IV collagen are recognized by osteogenin. Osteogenin binds to a collagen IV affinity column, and is eluted by 6.0 M urea with 1 M NaCl, pH 7.4, and the eluate contained the osteogenic activity as demonstrated in vivo. Binding of osteogenin to collagen IV is not influenced by either laminin or fibronectin. These results imply that osteogenin binding to extracellular matrix components including collagens I and IV and heparin may have physiological relevance, and such interactions may modulate its local action.

Original languageEnglish (US)
Pages (from-to)17281-17284
Number of pages4
JournalJournal of Biological Chemistry
Volume265
Issue number28
StatePublished - Oct 5 1990
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry

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    Paralkar, V. M., Nandedkar, A. K. N., Pointer, R. H., Kleinman, H. K., & Reddi, A. H. (1990). Interaction of osteogenin, a heparin binding bone morphogenetic protein, with type IV collagen. Journal of Biological Chemistry, 265(28), 17281-17284.