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Enhanced matrix synthesis and in vitro formation of cartilage‐like tissue by genetically modified chondrocytes expressing BMP‐7
Author(s) -
Hidaka Chisa,
Quitoriano Mannix,
Warren Russell F.,
Crystal Ronald G.
Publication year - 2001
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1016/s0736-0266(01)00019-5
Subject(s) - cartilage , aggrecan , chondrocyte , microbiology and biotechnology , bone morphogenetic protein , extracellular matrix , proteoglycan , type ii collagen , chemistry , bone morphogenetic protein 2 , matrix (chemical analysis) , in vitro , anatomy , biology , osteoarthritis , pathology , medicine , gene , biochemistry , articular cartilage , alternative medicine , chromatography
Bone morphogenic protein‐7 (BMP‐7) supports ectopic cartilage and bone formation, is expressed in normal articular cartilage, and increases matrix synthesis in chondrocytes. Based on this knowledge, we hypothesized that an adenovirus (Ad) vector encoding human BMP‐7 could be used to modify chondrocytes genetically to improve their capacity for cartilage repair. An adenovirus vector encoding BMP‐7 (AdBMP‐7) was constructed and its bioactivity confirmed by ectopic bone formation assay. AdBMP‐7 modification of bovine chondrocytes induced expression of BMP‐7 mRNA and bioactive protein, resulting in an increase in incorporation of 35 SO 4 −into proteoglycan, 3 H‐proline uptake into protein, and the expression of the cartilage‐specific matrix genes, aggrecan and type II collagen. An in vitro model of chondrocyte transplantation was used to demonstrate the feasibility of using genetically modified chondrocytes to enhance formation of cartilage‐like tissue. When transplanted onto cartilage explants and maintained in vitro for 3 weeks, chondrocytes modified with AdBMP‐7 formed 1.9‐fold thicker tissue than chondrocytes modified with a control vector ( P < 0.001). This tissue was positive for type II collagen and proteoglycan but negative for type X collagen and demonstrated a cartilage‐like morphology. These observations suggest that Ad‐mediated transfer of BMP‐7 gene to chondrocytes enhances the chondrocyte‐specific matrix synthesis and their capacity to form cartilage‐like tissue, thus representing a strategy that may improve cell‐based cartilage repair. © 2001 Orthopaedic Research Society. Punlished by Elsevier Science Ltd. All rights reserved.