Enhancing the vascularization of three-dimensional porous alginate scaffolds by incorporating controlled release basic fibroblast growth factor microspheres Academic Article uri icon


  • Site-specific delivery of angiogenic growth fac- tors from tissue-engineered devices should provide an effi- cient means of stimulating localized vessel recruitment to the cell transplants and would ensure cell survival and function. In the present article, we describe the construction of a novel porous alginate scaffold that incorporates tiny poly (lactic-co-glycolic acid) microspheres capable of con- trolling the release of angiogenic factors, such as basic fibro- blast growth factor (bFGF). The microspheres are an integral part of the solid alginate matrix, and their incorporation does not affect the scaffold porosity or pore size. In vitro, bFGF was released from the porous composite scaffolds in a controlled manner and it was biologically active as assessed by its ability to induce the proliferation of cardiac fibro- blasts. The controlled delivery of bFGF from the three-di- mensional scaffolds accelerated the matrix vascularization after implantation on the mesenteric membrane in rat peri- toneum. The number of penetrating capillaries into the bFGF-releasing scaffolds was nearly fourfold higher than into the control scaffolds (those incorporating microspheric BSA and heparin but not bFGF). At day 10 posttransplanta- tion, capillary density in the composite scaffolds was 45 3/mm 2 and it increased to 70 7/mm 2 by day 21. The released bFGF induced the formation of large and matured blood vessels, as judged by the massive layer of mural cells surrounding the endothelial cells. The control over bFGF delivery and localizing its effects to areas of need, may aid in the wider application of bFGF in therapeutic angiogenesis as well as in tissue engineering. © 2003 Wiley Periodicals, Inc. J Biomed Mater Res 65A: 489 - 497, 2003

publication date

  • January 1, 2003