Secreted protein acidic and rich in cysteine (SPARC/osteonectin/BM-40) binds to fibrinogen fragments D and E, but not to native fibrinogen

Hua Wang, Gail Workman, Shengfu Chen, Thomas H. Barker, Buddy D. Ratner, E. Helene Sage, Shaoyi Jiang

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Secreted protein acidic and rich in cysteine (SPARC/osteonectin/BM-40) is a matricellular protein that functions in wound healing. Fibrinogen is a plasma protein involved in many aspects of wound healing, such as inflammation, fibrosis and thrombosis. In this study, the binding of SPARC to both native and plasmin-cleaved fibrinogen under physiological conditions was examined by the use of a surface plasmon resonance (SPR) biosensor. We show that SPARC binds to plasmin-cleaved fibrinogen, but not to native fibrinogen. SPARC binds to both fibrinogen fragments D and E fg D and fg E with similar dissociation constants (8.67 × 10- 8 M for Fg D and 1.61 × 10- 7 M for Fg E). Results from endothelial cell proliferation assays show that the binding of SPARC to Fg E suppressed the inhibition of proliferation by SPARC, whereas the binding of SPARC to Fg D did not influence the activity of SPARC on the cell cycle. The interaction of SPARC with fibrinogen fragments D and E, which are produced as a result of proteolytic activation of fibrinolysis, reveals potential storage sites in provisional extracellular matrix for SPARC during the wound healing process and indicates a regulatory role of SPARC in fibrinolysis and angiogenesis.

Original languageEnglish (US)
Pages (from-to)20-26
Number of pages7
JournalMatrix Biology
Volume25
Issue number1
DOIs
Publication statusPublished - Jan 1 2006

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Keywords

  • Fibrinogen
  • Fibrinolysis
  • SPARC
  • SPR
  • Wound healing

ASJC Scopus subject areas

  • Molecular Biology

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