4.5 Article

Controlled release of FGF-2 using fragmin/protamine microparticles and effect on neovascularization

Journal

JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
Volume 91A, Issue 3, Pages 814-823

Publisher

WILEY
DOI: 10.1002/jbm.a.32265

Keywords

fragmin/protamine microparticles; fibroblast growth factor-2 (FGF-2); stabilization; complex formation; vascularization

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Water-insoluble fragmin/protamine microparticles of about 0.5-1. mu m in diameter were prepared by simple mixing of low-molecular-weight heparin (fragmin) with protamine. We investigated the capability of these microparticles to immobilize fibroblast growth factor (FGF)-2, to protect FGF-2 against degradation, to enhance FGF-2 activity, and to facilitate controlled release of FGF-2. FGF-2 bound to the fragmin/protamine microparticles with high affinity (Kd = 2.08 x 10(-9) M) and the half-life of FGF-2-activity was prolonged Substantially through binding of FGF-2 to the microparticles, by protection of FGF-2 from inactivation by heat and proteolysis. After Subcutaneous injection into the back of mice, the fragmin/protamine microparticles underwent biodegradation and disappeared in about 2 weeks. A similar injection of FGF-2-containing microparticles resulted in significant neovascularization and fibrous tissue formation near the injection site after 1 week. These results indicate that controlled release of biologically active FGF-2 Occurs through both slow diffusion and biodegradation of the microparticles, with subsequent induction of neovascularization. (C) 2008 Wiley Periodicals, Inc. J Biomed Mater Res 91A: 814-823, 2009

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