Multilayered microspheres for the controlled release of growth factors in tissue engineering

Dewi P. Go, Sally Louise Gras, Debapriya Mitra, Thanh H. Nguyen, Geoffrey W Stevens, Justin J. Cooper-White, Andrea J. O'Connor

Research output: Contribution to journalArticleResearchpeer-review

41 Citations (Scopus)

Abstract

Tissue regeneration may be stimulated by growth factors but to be effective, this delivery must be sustained and requires delivery vehicles that overcome the short half-life of these molecules in vivo. One promising approach is to couple growth factors to the biomaterial surface so that they are readily bioavailable. Here the layer-by-layer process was used to construct a multilayered polyelectrolyte delivery system on the surface of poly(lactic-co-glycolic) acid constructs. The system was first optimized on a planar surface before translation to a 3D microsphere system. The layers incorporated heparin to facilitate the loading of basic fibroblast growth factor and increase growth factor stability. Cross-linked capping layers also reduced any burst release. The model growth factor was released in a sustained manner and stimulated significantly higher cell proliferation in vitro on release compared with the addition of the growth factor heparin complex free in solution, demonstrating the promise of this approach.

Original languageEnglish
Pages (from-to)1494-1503
Number of pages10
JournalBiomacromolecules
Volume12
Issue number5
DOIs
Publication statusPublished - 9 May 2011
Externally publishedYes

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