title: Induction of chondrogenesis and expression of superficial zone protein (SZP)/lubricin by mesenchymal progenitors in the infrapatellar fat pad of the knee joint treated with TGF-beta1 and BMP-7.
abstract: Superficial zone protein (SZP) is a key mediator of boundary lubrication of articular cartilage in joints. In this investigation, we made the unexpected discovery that SZP was expressed in infrapatellar fat pad (IFP) from bovine knee. Quantitative analysis of secreted proteins in the medium of the IFP stromal cells demonstrated a significant stimulation by TGF-beta1 and BMP-7. Real-time PCR analysis revealed the SZP expression was up-regulated by TGF-beta1 and BMP-7. Chondrogenically differentiated IFP progenitor cells were stimulated by TGF-beta1 and BMP-7 to synthesize and secrete SZP. SZP mRNA was significantly up-regulated by chondrogenic induction for 21 days. These findings indicate that the stimulation of SZP expression by TGF-beta and BMP-7 may lead to functional improvement of damaged intraarticular tissues and that IFP progenitor cells may be a potential useful source for inducing superficial zone of articular cartilage by tissue engineering for regeneration of damaged articular cartilage due to osteoarthritis.
authors.affiliation: Center for Tissue Regeneration and Repair, Department of Orthopaedic Surgery, University of California-4635 Second Avenue, Room 2000, Sacramento, CA 95817, USA. sangyang@beige.plala.or.jp
authors.forename: Sang Yang
authors.initials: SY
authors.lastname: Lee
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Nakagawa
authors.forename: A Hari
authors.initials: AH
authors.lastname: Reddi
mesh_terms: D000273:Adipose Tissue / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D000818:Animals; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins / Q000494:pharmacology; D002417:Cattle; D002478:Cells, Cultured; D020219:Chondrogenesis / Q000187:drug effects; D006023:Glycoproteins / Q000235:genetics / Q000378:metabolism*; D007719:Knee Joint / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D008648:Mesoderm / Q000187:drug effects / Q000378:metabolism; D010329:Patella / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D011509:Proteoglycans / Q000235:genetics / Q000378:metabolism*; D013234:Stem Cells / Q000187:drug effects / Q000378:metabolism; D017154:Stromal Cells / Q000187:drug effects / Q000378:metabolism; D016212:Transforming Growth Factor beta / Q000494:pharmacology; D053773:Transforming Growth Factor beta1 / Q000494:pharmacology; D000099158:Proteoglycan 4
chemical_list: D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins; D006023:Glycoproteins; D011509:Proteoglycans; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1; D000099158:Proteoglycan 4; C498836:PRG4 protein, Bos taurus