In vitro and in vivo release of vascular endothelial growth factor from gelatin microparticles and biodegradable composite scaffolds

Zarana S. Patel, Hiroki Ueda, Masaya Yamamoto, Yasuhiko Tabata, Antonios G. Mikos

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

Purpose. This work evaluated gelatin microparticles and biodegradable composite scaffolds for the controlled release of vascular endothelial growth factor (VEGF) in vitro and in vivo. Methods. Gelatin crosslinking, VEGF dose, and buffer type were investigated for their effects on VEGF release. Release was also evaluated from microparticles confined within porous polymer scaffolds (composites). In vitro and in vivo studies were conducted using radiolabeled VEGF. Results. The effect of VEGF dose on its fractional release from gelatin microparticles in vitro was minimal, but the addition of collagenase to the buffer resulted in a higher cumulative release of VEGF. Gelatin crosslinking extent was a significant factor on release from both microparticles alone and composite scaffolds in vitro and in vivo. VEGF bioactivity from composite scaffolds in vitro was maintained above 90% of the expected bioactivity over 14 days. Conclusions. VEGF release kinetics were dependent on the extent of gelatin crosslinking and were characteristic of the specific growth factor due to the effects of growth factor size, charge, and conformation on its complexation with gelatin. These studies demonstrate the utility of gelatin microparticles and their composite scaffolds as delivery vehicles for the controlled release of VEGF for tissue engineering applications.

Original languageEnglish
Pages (from-to)2370-2378
Number of pages9
JournalPharmaceutical research
Volume25
Issue number10
DOIs
Publication statusPublished - 2008 Oct 1
Externally publishedYes

Keywords

  • Bone tissue engineering
  • Controlled drug delivery
  • Gelatin microparticles
  • Porous polymer scaffold
  • Vascular endothelial growth factor

ASJC Scopus subject areas

  • Biotechnology
  • Molecular Medicine
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry
  • Pharmacology (medical)

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