Spatio-temporal VEGF and PDGF Delivery Patterns Blood Vessel Formation and Maturation

Overview

Journal Pharm Res

Specialties Pharmacology
Pharmacy

Date 2006 Dec 28

PMID 17191092

Citations 138

Authors

Ruth R Chen

Eduardo A Silva

William W Yuen

David J Mooney

Affiliations

Soon will be listed here.

Abstract

Purpose: Biological mechanisms of tissue regeneration are often complex, involving the tightly coordinated spatial and temporal presentation of multiple factors. We investigated whether spatially compartmentalized and sequential delivery of factors can be used to pattern new blood vessel formation.

Materials And Methods: A porous bi-layered poly(lactide-co-glycolide) (PLG) scaffold system was used to locally present vascular endothelial growth factor (VEGF) alone in one spatial region, and sequentially deliver VEGF and platelet-derived growth factor (PDGF) in an adjacent region. Scaffolds were implanted in severely ischemic hindlimbs of SCID mice for 2 and 6 weeks, and new vessel formation was quantified within the scaffolds.

Results: In the compartment delivering a high dose of VEGF alone, a high density of small, immature blood vessels was observed at 2 weeks. Sequential delivery of VEGF and PDGF led to a slightly lower blood vessel density, but vessel size and maturity were significantly enhanced. Results were similar at 6 weeks, with continued remodeling of vessels in the VEGF and PDGF layer towards increased size and maturation.

Conclusions: Spatially localizing and temporally controlling growth factor presentation for angiogenesis can create spatially organized tissues.

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