title: Effects of controlled released BMP-7 on markers of inflammation and degradation during the cultivation of human osteoarthritic chondrocytes.
abstract: The aim of the present study is to investigate the effects of BMP-7 released from polylactide microspheres on the appearance of various catabolic and inflammatory cytokines secreted by osteoarthritic chondrocytes cultivated in a collagen gel. Articular chondrocytes of 15 patients suffering from osteoarthritis are transferred to a collagen type-I gel. Additionally, BMP-7 encapsulated into polylactide microspheres (50 ng BMP-7/mL gel) is added. After 14 days, gene expression and protein appearance of various genes involved in matrix turnover and inflammation are investigated by immunohistochemical staining and RT-PCR and compared to untreated controls. TNF-α, MMP-13, IL-6, IL-1β, and VEGF gene expressions are decreased in the treatment group. In contrast, BMP-7-induced matrix synthesis is not affected, leaving collagen type-II (Col-II) gene expression to be elevated, while collagen type-I (Col-I) is decreased. In summary, controlled release of low concentrated BMP-7 from polylactide microspheres leads to a decrease in gene expression of the investigated inflammation and matrix degradation markers whereas matrix synthesis is induced.
authors.affiliation: Department of Orthopaedic and Trauma Surgery, Aachen University Hospital, and Department of Anatomy and Cell Biology, RWTH Aachen University, Medical Faculty, Aachen, Germany.
authors.forename: Karsten
authors.initials: K
authors.lastname: Gavenis
authors.forename: Thomas
authors.initials: T
authors.lastname: Pufe
authors.forename: Lars Ove
authors.initials: LO
authors.lastname: Brandenburg
authors.forename: Katharina
authors.initials: K
authors.lastname: Schiffl
authors.forename: Bernhard
authors.initials: B
authors.lastname: Schmidt-Rohlfing
mesh_terms: D001483:Base Sequence; D015415:Biomarkers / Q000378:metabolism; D055419:Bone Morphogenetic Protein 7 / Q000008:administration & dosage*; D018929:Cell Culture Techniques; D019902:Chondrocytes / Q000187:drug effects* / Q000378:metabolism* / Q000473:pathology; D024042:Collagen Type I / Q000235:genetics / Q000378:metabolism; D024043:Collagen Type II / Q000235:genetics / Q000378:metabolism; D016207:Cytokines / Q000235:genetics / Q000378:metabolism; D003692:Delayed-Action Preparations; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D018836:Inflammation Mediators / Q000378:metabolism*; D053583:Interleukin-1beta / Q000235:genetics / Q000378:metabolism; D015850:Interleukin-6 / Q000235:genetics / Q000378:metabolism; D053509:Matrix Metalloproteinase 13 / Q000235:genetics / Q000378:metabolism; D008863:Microspheres; D010003:Osteoarthritis / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000008:administration & dosage; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A / Q000235:genetics / Q000378:metabolism
chemical_list: C525819:BMP7 protein, human; D015415:Biomarkers; D055419:Bone Morphogenetic Protein 7; D024042:Collagen Type I; D024043:Collagen Type II; D016207:Cytokines; D003692:Delayed-Action Preparations; C508600:IL6 protein, human; D018836:Inflammation Mediators; D053583:Interleukin-1beta; D015850:Interleukin-6; D012333:RNA, Messenger; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A; C507079:MMP13 protein, human; D053509:Matrix Metalloproteinase 13