title: Differential expression pattern of extracellular matrix molecules during chondrogenesis of mesenchymal stem cells from bone marrow and adipose tissue.
abstract: Adipose-derived adult stem cells (ADASCs) or bone marrow-derived mesenchymal stem cells (BMSCs) are considered as alternative cell sources for cell-based cartilage repair due to their ability to produce cartilage-specific matrix. This article addresses the differential expression pattern of extracellular matrix (ECM) molecules in BMSCs or ADASCs following chondrogenic differentiation. Human BMSCs or ADASCs were encapsulated in alginate and cultured in TGF-beta1-containing medium for 2 or 3 weeks. Chondrospecific mRNA expression was analyzed and alternative splicing of alpha(1)-procollagen type II mRNA was monitored via reverse transcriptase-polymerase chain reaction (RT-PCR). Corresponding ECM synthesis was demonstrated using immunohistochemistry. After chondroinduction, expression of collagen type II, type X, COMP and aggrecan mRNA was 3-15-fold higher than in ADASCs. The type IIA splicing form of alpha(1)-procollagen type II was expressed in both populations, and the type IIB splicing form was exclusively detected in BMSCs. In response to TGF-beta, collagen type II and X were secreted more strongly by BMSCs than by ADASCs. BMSCs express a more mature phenotype than ADASCs after chondroinduction. TGF-beta1 induces alternative splicing of the alpha(1)-procollagen type II transcript in BMSCs, but not in ADASCs. These findings may direct the development of a cell-specific culture environment either to prevent hypertrophy in BMSCs or to promote chondrogenic maturation in ADASCs.
authors.affiliation: Department of Orthopaedic and Trauma Surgery, University Medical Center, Albert-Ludwigs University, Freiburg, Germany. mehlhorn@ch11.uk1.uni-freiburg.de
authors.forename: A T
authors.initials: AT
authors.lastname: Mehlhorn
authors.forename: P
authors.initials: P
authors.lastname: Niemeyer
authors.forename: S
authors.initials: S
authors.lastname: Kaiser
authors.forename: G
authors.initials: G
authors.lastname: Finkenzeller
authors.forename: G B
authors.initials: GB
authors.lastname: Stark
authors.forename: N P
authors.initials: NP
authors.lastname: Südkamp
authors.forename: H
authors.initials: H
authors.lastname: Schmal
mesh_terms: D017667:Adipocytes / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D001854:Bone Marrow Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D018929:Cell Culture Techniques / Q000379:methods; D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D020219:Chondrogenesis / Q000187:drug effects / Q000502:physiology*; D005109:Extracellular Matrix / Q000378:metabolism*; D016326:Extracellular Matrix Proteins / Q000378:metabolism*; D015870:Gene Expression / Q000187:drug effects / Q000502:physiology; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D023822:Tissue Engineering / Q000379:methods; D053773:Transforming Growth Factor beta1 / Q000008:administration & dosage
chemical_list: D016326:Extracellular Matrix Proteins; D053773:Transforming Growth Factor beta1