Vascularization and cellularization of collagen scaffolds incorporated with two different collagen-targeting human basic fibroblast growth factors

J Biomed Mater Res A. 2007 Sep 1;82(3):630-6. doi: 10.1002/jbm.a.31179.

Abstract

To develop a collagen-based wound targeting repair system, we introduced two collagen-binding domains (CBDs) into the human basic fibroblast growth factor (bFGF). Three expression vectors were constructed: the first one (named V-bFGF) contained bFGF and the CBD WREPSFCALS derived from von Willeband's factor (vWF); the second (named C-bFGF) contained bFGF and the CBD TKKTLRT derived from collagenase; the third (named bFGF) was bFGF as a control. The recombinant proteins of V-bFGF and C-bFGF were demonstrated to retain both growth factor activity and collagen-binding activity. We found that C-bFGF possessed higher collagen-binding ability than V-bFGF. The targeted repair systems consisting of collagen scaffolds and CBD-bFGFs were assembled in vitro and then implanted subcutaneously. Results showed that C-bFGF promoted vascularization at the implanted sites more effectively than V-bFGF. Histological analysis showed more cells migrated into collagen scaffolds incorporated with C-bFGF than those with V-bFGF. These data suggested that the higher collagen-binding ability the CBD-bFGF possessed, the more significant vascularization, and cellularization were observed. In summary, CBD-bFGF/collagen system could be used as a targeted repair system with beneficial effects of the restriction of bFGF diffusion, the prolonging of bFGF activity, and the targeted promotion of vascularization and cellularization.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Binding Sites
  • Cell Line
  • Cell Movement
  • Collagen / metabolism*
  • Collagenases / genetics
  • Fibroblast Growth Factor 2 / genetics*
  • Humans
  • Neovascularization, Physiologic / drug effects*
  • Peptide Fragments / genetics
  • Protein Binding
  • Protein Engineering / methods*
  • Recombinant Fusion Proteins / pharmacology
  • Wound Healing / drug effects
  • von Willebrand Factor / genetics

Substances

  • Peptide Fragments
  • Recombinant Fusion Proteins
  • von Willebrand Factor
  • Fibroblast Growth Factor 2
  • Collagen
  • Collagenases