title: Exogenous type I collagen facilitates osteogenic differentiation and acts as a substrate for mineralization of rat marrow mesenchymal stem cells in vitro.
abstract: We cultured rat mesenchymal stem cells (MSCs) in a medium containing beta-glycerophosphate, ascorbic acid, and dexamethasone to show in vitro osteogenic differentiation of the MSCs. The differentiation was enhanced by adding solubilized type I collagen to the medium as evidenced by higher alkaline phosphatase activity as well as more calcium deposition than that without collagen. The exogenous collagen integrated well with the mineralized bone matrix and maintained the native triple helical structure. These findings indicate that exogenously supplemented type I collagen acts as a component of the extracellular matrix of MSCs, and deposited type I collagen facilitates osteogenic differentiation followed by maturation of mineralized bone matrix.
authors.affiliation: Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan. tkihara@bio.c.u-tokyo.ac.jp
authors.forename: Takanori
authors.initials: T
authors.lastname: Kihara
authors.forename: Motohiro
authors.initials: M
authors.lastname: Hirose
authors.forename: Akira
authors.initials: A
authors.lastname: Oshima
authors.forename: Hajime
authors.initials: H
authors.lastname: Ohgushi
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000494:pharmacology; D002113:Calcification, Physiologic / Q000187:drug effects / Q000502:physiology*; D002454:Cell Differentiation / Q000187:drug effects*; D002478:Cells, Cultured; D024042:Collagen Type I / Q000378:metabolism / Q000494:pharmacology*; D003907:Dexamethasone / Q000494:pharmacology; D005109:Extracellular Matrix / Q000502:physiology; D005994:Glycerophosphates / Q000494:pharmacology; D008297:Male; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000648:ultrastructure; D018613:Microscopy, Confocal; D010012:Osteogenesis / Q000187:drug effects*; D051381:Rats; D011916:Rats, Inbred F344; D013552:Swine
chemical_list: D024042:Collagen Type I; D005994:Glycerophosphates; D003907:Dexamethasone; D001205:Ascorbic Acid; C031463:beta-glycerophosphoric acid