title: Attachment, proliferation, and migration of marrow stromal osteoblasts cultured on biomimetic hydrogels modified with an osteopontin-derived peptide.
abstract: We prepared oligo(poly(ethylene glycol) fumarate) (OPF) hydrogels modified with a rat osteopontin-derived peptide (ODP), Asp-Val-Asp-Val-Pro-Asp-Gly-Arg-Gly-Asp-Ser-Leu-Ala-Try-Gly (DVDVPDGRGDSLAYG), as well as Gly-Arg-Gly-Asp-Ser (GRGDS) and investigated the modulation of marrow stromal osteoblast function on the peptide-modified hydrogels. Osteoblast attachment was competitively inhibited by a soluble peptide suggesting that the interaction of osteoblasts with the hydrogel was ligand specific. The proliferation index of osteoblasts relative to the initial seeding density was similar on the hydrogels modified with ODP (1.18+/-0.13) and GRGDS (1.27+/-0.12). However, fibroblasts proliferated faster on GRGDS-modified hydrogels than on ODP-modified hydrogels as evidenced by the proliferation indices of 4.89+/-0.03 and 2.42+/-0.16, respectively. A megacolony migration assay conducted for 3 days with a seeding density of 53,000 cells/cm(2) showed that osteoblasts migrated to a longer distance on ODP-modified hydrogels (0.23+/-0.06 mm/day) than on hydrogels modified with GRGDS (0.15+/-0.02 mm/day). In addition, osteoblasts migrated faster than fibroblasts seeded at the same density on ODP-modified hydrogels (0.15+/-0.11 mm/day). The migration of osteoblasts on the peptide-modified hydrogels was dependent on the peptide concentration of the hydrogels resulting in an increased migration distance with increasing the peptide concentration for the concentrations tested. These results show that OPF-based biomimetic hydrogels hold promise for modulating cell proliferation and migration for specific applications by altering the specific ligand and its concentration in the hydrogels.
authors: Department of Bioengineering, Rice University, MS-142, P.O. Box 1892, 77251-1892, Houston, TX, USA
authors: Heungsoo
authors: H
authors: Shin
authors: Kyriacos
authors: K
authors: Zygourakis
authors: Mary C
authors: MC
authors: Farach-Carson
authors: Michael J
authors: MJ
authors: Yaszemski
authors: Antonios G
authors: AG
authors: Mikos
mesh_terms: D000818:Animals; D040761:Biomimetic Materials / Q000737:chemistry*; D001854:Bone Marrow Cells / Q000166:cytology / Q000502:physiology*; D002448:Cell Adhesion / Q000502:physiology; D018929:Cell Culture Techniques / Q000295:instrumentation / Q000379:methods; D002455:Cell Division / Q000502:physiology; D002460:Cell Line; D002465:Cell Movement / Q000502:physiology*; D002478:Cells, Cultured; D005109:Extracellular Matrix / Q000502:physiology / Q000648:ultrastructure; D005347:Fibroblasts / Q000166:cytology / Q000502:physiology*; D048091:Guided Tissue Regeneration / Q000379:methods; D020100:Hydrogels / Q000737:chemistry*; D008297:Male; D008422:Materials Testing; D010006:Osteoblasts / Q000166:cytology / Q000502:physiology*; D053495:Osteopontin; D010455:Peptides / Q000737:chemistry; D051381:Rats; D017208:Rats, Wistar; D012795:Sialoglycoproteins / Q000737:chemistry*; D017154:Stromal Cells / Q000166:cytology / Q000502:physiology; D023822:Tissue Engineering / Q000379:methods
chemical_list: D020100:Hydrogels; D010455:Peptides; D012795:Sialoglycoproteins; C506897:Spp1 protein, rat; D053495:Osteopontin