Perlecan domain I promotes fibroblast growth factor 2 delivery in collagen I fibril scaffolds.
Perlecan, a heparan sulfate proteoglycan, is widely distributed in developing and adult tissues and plays multiple, important physiological roles. Studies with knockout mouse models indicate that expression of perlecan and heparan sulfate is critical for proper skeletal morphogenesis. Heparan sulfate chains bind and potentiate the activities of various growth factors such as fibroblast growth factor 2 (FGF-2). Previous studies indicate that important biological activities are associated with the heparan sulfate-bearing domain I of perlecan (PlnDI; French et al. J. Bone Miner. Res. 17 , 48, 2002). In the present study, we have used recombinant, glycosaminoglycan-bearing PlnDI to reconstitute three-dimensional scaffolds of collagen I. Collagen I fibrils bound PlnDI much better than native collagen I monomers or heat-denatured collagen I preparations. Heparitinase digestion demonstrated that recombinant PlnDI was substituted with heparan sulfate and that these heparan sulfate chains were critically important not only for efficient integration of PlnDI into scaffolds, but also for FGF-2 binding and retention. PlnDI-containing collagen I scaffolds to which FGF-2 was bound sustained growth of both MG63, an osteoblastic cell line, and human bone marrow stromal cells (hBMSCs) significantly better than scaffolds lacking either PlnDI or FGF-2. Collectively, these studies demonstrate the utility of PlnDI in creating scaffolds that better mimic natural extracellular matrices and better support key biological activities.
Yang
W D
WD
Department of Biological Sciences, University of Delaware, Newark, Delaware 19716, USA.
Gomes
R R
RR
Alicknavitch
M
M
Farach-Carson
M C
MC
Carson
D D
DD
D001854:Bone Marrow Cells / Q000378:metabolism; D002460:Cell Line; D024042:Collagen Type I / Q000378:metabolism*; D016222:Fibroblast Growth Factor 2 / Q000378:metabolism*; D019812:Heparan Sulfate Proteoglycans / Q000737:chemistry* / Q000235:genetics; D006497:Heparan Sulfate / Q000378:metabolism; D006801:Humans; D010006:Osteoblasts / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry; D017154:Stromal Cells / Q000166:cytology / Q000378:metabolism
D024042:Collagen Type I; D016222:Fibroblast Growth Factor 2; D019812:Heparan Sulfate Proteoglycans; D006497:Heparan Sulfate; D011994:Recombinant Proteins; C071927:perlecan
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