title: BMP-6 enhances chondrogenesis in a subpopulation of human marrow stromal cells.
abstract: Marrow stromal cells (MSCs) can differentiate into several mesenchymal lineages. MSCs were recently shown to form cartilage in micromass cultures with serum-free medium containing TGF-beta and dexamethasone. Here we found that addition of BMP-6 increased the weight of the pellets about 10-fold and they stained more extensively for proteoglycans. mRNAs for type II procollagen and type X collagen were detected at 1 week and the levels were increased at 3 weeks. We also compared two subpopulation of cultures of MSCs: Small and rapidly self-renewing cells (RS cells) and the large, more mature and slowly replicating cells (mMSCs). The cartilage pellets prepared from cultures enriched for RS cells were about 2.5-fold larger, stained more extensively for proteoglycans, and had levels of mRNA for type II procollagen that were 1.6-fold higher. Also, RS cells retained more of their chondrogenic potential as the cells were passaged.
authors.affiliation: Center for Gene Therapy, Tulane University Health Sciences Center, New Orleans, Louisiana 70112, USA.
authors.forename: I
authors.initials: I
authors.lastname: Sekiya
authors.forename: D C
authors.initials: DC
authors.lastname: Colter
authors.forename: D J
authors.initials: DJ
authors.lastname: Prockop
mesh_terms: D001854:Bone Marrow Cells / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D055418:Bone Morphogenetic Protein 6; D019485:Bone Morphogenetic Proteins / Q000494:pharmacology*; D002356:Cartilage / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism; D002452:Cell Count; D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D003094:Collagen / Q000235:genetics / Q000378:metabolism; D003907:Dexamethasone / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005434:Flow Cytometry; D006801:Humans; D011347:Procollagen / Q000235:genetics / Q000378:metabolism; D011509:Proteoglycans / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013234:Stem Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D017154:Stromal Cells / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D016212:Transforming Growth Factor beta / Q000494:pharmacology; D053782:Transforming Growth Factor beta3
chemical_list: C525816:BMP6 protein, human; D055418:Bone Morphogenetic Protein 6; D019485:Bone Morphogenetic Proteins; D011347:Procollagen; D011509:Proteoglycans; D012333:RNA, Messenger; D016212:Transforming Growth Factor beta; D053782:Transforming Growth Factor beta3; D003907:Dexamethasone; D003094:Collagen