title: Type I and II collagen regulation of chondrogenic differentiation by mesenchymal progenitor cells.
abstract: Chondrogenic differentiation by mesenchymal progenitor cells (MPCs) is associated with cytokines such as transforming growth factor-beta 1 (TGF-beta1) and dexamethasone. Extracellular matrix (ECM) also regulates the differentiation by MPCs. To define whether ECM plays a functional role in regulation of the chondrogenic differentiation by MPCs, an in vitro model was used. That model exposed to dexamethasone, recombinant human TGF-beta1(rhTGF-beta1) and collagens. The results showed that MPCs incorporated with dexamethasone and rhTGF-beta1 increased proliferation and expression of glycosaminoglycan (GAG) after 14 days. Type II collagen enhanced the GAG synthesis, but did not increase alkaline phosphatase (ALP) activity. When adding dexamethasone and rhTGF-beta1 MPCs increased mRNA expression of Sox9. Incorporation with type II collagen, dexamethasone and rhTGF-beta1, MPCs induced mRNA expression of aggrecan and enhanced levels of type II collagen, and Sox9 mRNA. In contrast, incorporation with type I collagen, dexamethasone and rhTGF-beta1 MPCs reduced levels of aggrecan, and Sox9 mRNA, and showed no type II collagen mRNA. Altogether, these results indicate that type I and II collagen, in addition to the cytokine effect, may play a functional role in regulating of chondrogenic differentiation by MPCs.
authors.affiliation: Institute of Medical Sciences, Taipei Medical University, 250 Wu-Hsing Street, Taipei 110, Taiwan.
authors.forename: C W
authors.initials: CW
authors.lastname: Chen
authors.forename: Y H
authors.initials: YH
authors.lastname: Tsai
authors.forename: W P
authors.initials: WP
authors.lastname: Deng
authors.forename: S N
authors.initials: SN
authors.lastname: Shih
authors.forename: C L
authors.initials: CL
authors.lastname: Fang
authors.forename: J G
authors.initials: JG
authors.lastname: Burch
authors.forename: W H
authors.initials: WH
authors.lastname: Chen
authors.forename: W F
authors.initials: WF
authors.lastname: Lai
mesh_terms: D053674:Aggrecans; D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D019902:Chondrocytes / Q000166:cytology / Q000187:drug effects*; D024042:Collagen Type I / Q000494:pharmacology*; D024043:Collagen Type II / Q000494:pharmacology*; D003907:Dexamethasone / Q000494:pharmacology; D016326:Extracellular Matrix Proteins / Q000235:genetics; D006025:Glycosaminoglycans / Q000096:biosynthesis; D006801:Humans; D037181:Lectins, C-Type; D059630:Mesenchymal Stem Cells / Q000502:physiology*; D011509:Proteoglycans / Q000235:genetics; D012333:RNA, Messenger / Q000032:analysis; D011817:Rabbits; D016212:Transforming Growth Factor beta / Q000494:pharmacology; D053773:Transforming Growth Factor beta1
chemical_list: D053674:Aggrecans; D024042:Collagen Type I; D024043:Collagen Type II; D016326:Extracellular Matrix Proteins; D006025:Glycosaminoglycans; D037181:Lectins, C-Type; D011509:Proteoglycans; D012333:RNA, Messenger; C508960:TGFB1 protein, human; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1; D003907:Dexamethasone