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Improving endothelial healing with novel chimeric mitogens.

Luke Brewster1, Eric M Brey, Michael Addis

  • 1Department of Surgery, Loyola University, 2160 South First Avenue, Maywood, IL 60153, USA.

American Journal of Surgery
|October 31, 2006
PubMed
Summary
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Heparin-binding growth-associated molecule (HBGAM) combined with fibroblast growth factor (FGF-1) or its mutant (S130K) improved endothelial healing after angioplasty. These HBGAM-growth factor combinations facilitated re-endothelialization without causing harmful myointimal thickening.

Area of Science:

  • Vascular biology and regenerative medicine

Background:

  • Heparin-binding growth-associated molecule (HBGAM) exhibits selective binding to endothelial cell receptors.
  • HBGAM can confer endothelial cell selectivity to angiogenic factors like fibroblast growth factor-1 (FGF-1).

Purpose of the Study:

  • To investigate the potential of HBGAM-conjugated growth factors to enhance endothelial healing after vascular injury.
  • To assess the efficacy of HBGAM/FGF-1 and HBGAM/S130K in promoting re-endothelialization without adverse vascular remodeling.

Main Methods:

  • Chimeric proteins were created by ligating FGF-1 or its potent mutant S130K to HBGAM.
  • The therapeutic effect was evaluated in a canine model of balloon angioplasty-induced arterial injury.
  • Re-endothelialization rates, neointimal mitotic index, and neointimal thickness were assessed at 30 days post-injury.

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Main Results:

  • Arteries treated with HBGAM/S130K and HBGAM/FGF-1 showed increased neointimal mitotic index and re-endothelialization rates compared to controls.
  • No significant increase in neointimal thickness or the neointimal-to-medial thickness ratio was observed in the treatment groups.
  • The chimeric proteins promoted endothelial repair without inducing excessive neointimal hyperplasia.

Conclusions:

  • HBGAM/S130K and HBGAM/FGF-1 facilitate endothelial healing and promote re-endothelialization following canine carotid artery balloon angioplasty.
  • These findings suggest that HBGAM-growth factor conjugates can enhance vascular repair without promoting detrimental myointimal thickening.
  • Clinical application of these growth factors, potentially in fibrin glue, may improve endothelialization after procedures like angioplasty or endarterectomy.