Journal
PHARMACEUTICAL RESEARCH
Volume 22, Issue 7, Pages 1110-1116Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11095-005-5644-2
Keywords
angiogenesis; ischemia; polymer; vascular endothelial growth factor
Funding
- NHLBI NIH HHS [R01 HL069957] Funding Source: Medline
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Purpose. We hypothesized that sustained delivery of vascular endothelial growth factor (VEGF) using a polymer [85:15 poly(lactide-co-glycolide) (PLG)] would enhance angiogenesis and improve perfusion of ischemic tissue. Methods. C57BL/6J mice (n = 20/group) underwent unilateral hind limb ischemia surgery and were randomized to groups of no scaffold implantation (phi-Implant), unloaded scaffold implantation (Empty-PLG), or implantation of scaffolds incorporating 3 mu g of VEGF(165) (PLG-VEGF). Endpoints included laser Doppler perfusion imaging (LDPI, ischemic/nonischemic limb, %), local vessel counts, immunohistochemistry for CD31, and alpha-smooth muscle actin. In vitro release kinetics of VEGF from PLG was also measured. Results. PLG-VEGF resulted in improved lower extremity perfusion vs. controls as measured by LDPI% at 7, 14, 21, and 28 days (p < 0.05). PLG-VEGF was associated with significantly greater percentage of vessels staining for CD31 and alpha-smooth muscle actin compared to the Empty-PLG or phi-Implant (p < 0.05 for both). Conclusions. The PLG-VEGF scaffolds resulted in sustained VEGF delivery, improved tissue perfusion, greater capillary density, and more mature vasculature compared to the controls. The sustained-release PLG polymer vehicle is a promising delivery system for therapeutic neovascularization applications.
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