title: Cyclic arginine-glycine-aspartate peptides enhance three-dimensional stem cell osteogenic differentiation.
abstract: The role of morphogens in bone regeneration has been widely studied, whereas the effect of matrix cues, particularly on stem cell differentiation, are less well understood. In this work, we investigated the effects of arginine-glycine-aspartate (RGD) ligand conformation (linear vs cyclic RGD) on primary human bone marrow stromal cell (hBMSC) and D1 stem cell osteogenic differentiation in three-dimensional (3D) culture and compared their response with that of committed MC3T3-E1 preosteoblasts to determine whether the stage of cell differentiation altered the response to the adhesion ligands. Linear RGD densities that promoted osteogenic differentiation of committed cells (MC3T3-E1 preosteoblasts) did not induce differentiation of hBMSCs or D1 stem cells, although matrices presenting the cyclic form of this adhesion ligand enhanced osteoprogenitor differentiation in 3D culture. This may be due to enhanced integrin-ligand binding. These studies indicate that biomaterial design parameters optimized for differentiated cell types may not directly translate to stem cell populations, because less-committed cells may require more instruction than differentiated cells. It is likely that design of synthetic extracellular matrices tailored to promote stem cell differentiation may enhance bone regeneration by transplanted cells.
authors.affiliation: Department of Chemical Engineering, University of Ann Arbor, Ann Arbor, Michigan, USA.
authors.forename: Susan X
authors.initials: SX
authors.lastname: Hsiong
authors.forename: Tanyarut
authors.initials: T
authors.lastname: Boontheekul
authors.forename: Nathaniel
authors.initials: N
authors.lastname: Huebsch
authors.forename: David J
authors.initials: DJ
authors.lastname: Mooney
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects*; D049109:Cell Proliferation / Q000187:drug effects; D006801:Humans; D051379:Mice; D039902:Multipotent Stem Cells / Q000166:cytology / Q000187:drug effects; D010012:Osteogenesis / Q000187:drug effects*; D010456:Peptides, Cyclic / Q000494:pharmacology*; D013234:Stem Cells / Q000166:cytology* / Q000187:drug effects*; D017154:Stromal Cells / Q000166:cytology / Q000187:drug effects; D046509:Tissue Culture Techniques
chemical_list: D010456:Peptides, Cyclic; C507169:cyclic arginine-glycine-aspartic acid peptide
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