Assessment of cartilage degradation effects of matrix metalloproteinase-13 in equine cartilage cocultured with synoviocytes

Lisa A. Fortier Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853.

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Lauren V. Schnabel Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853.

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Hussni O. Mohammed Department of Population Medicine and Diagnostic Services, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853.

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Karen G. Mayr Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853.

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Abstract

Objective—To determine the effects of matrix metalloproteinase (MMP)-13, compared with interleukin (IL)-1α, on cartilage matrix molecule gene expression in a coculture system of equine cartilage explants and synoviocytes.

Sample Population—Articular cartilage and synovium specimens harvested from femoropatellar joints of 4 horses, aged 3 to 5 years.

Procedures—Synoviocytes were isolated and cocultured with cartilage explants. Cultures were treated with human recombinant MMP-13 (1, 25, or 100 ng/mL) or IL-1α (0.01, 0.1, 1.0, or 10 ng/mL) for 96 hours, with medium exchange at 48 hours. Cartilage extracts and media were analyzed for glycosaminoglycan (GAG) content, and results were adjusted to cartilage DNA content. Quantitative PCR was performed on mRNA from cartilage (MMP-3, MMP-13, aggrecan, and collagen type IIB [COL2A1]) and synoviocytes (MMP-3 and MMP-13), and results were adjusted to 18S ribosomal subunit mRNA expression. Treatments were performed in triplicate, and the experiment was repeated 4 times.

Results—Cultures treated with MMP-13 or IL-1α had increased media GAG concentration at 48 and 96 hours. Aggrecan and COL2A1 mRNA expression were increased by application of MMP-13 or IL-1α. Gene expression of the catabolic mediator, MMP-3, in cartilage and synoviocytes was increased in cultures treated with MMP-13 or IL-1α. Expression of MMP-13 mRNA in cartilage was increased by IL-1α, but decreased in synoviocytes by MMP-13 treatment.

Conclusions and Clinical Relevance—Results support the use of recombinant MMP-13 in a coculture system of synoviocytes and cartilage explants for the study of osteoarthritis.

Abstract

Objective—To determine the effects of matrix metalloproteinase (MMP)-13, compared with interleukin (IL)-1α, on cartilage matrix molecule gene expression in a coculture system of equine cartilage explants and synoviocytes.

Sample Population—Articular cartilage and synovium specimens harvested from femoropatellar joints of 4 horses, aged 3 to 5 years.

Procedures—Synoviocytes were isolated and cocultured with cartilage explants. Cultures were treated with human recombinant MMP-13 (1, 25, or 100 ng/mL) or IL-1α (0.01, 0.1, 1.0, or 10 ng/mL) for 96 hours, with medium exchange at 48 hours. Cartilage extracts and media were analyzed for glycosaminoglycan (GAG) content, and results were adjusted to cartilage DNA content. Quantitative PCR was performed on mRNA from cartilage (MMP-3, MMP-13, aggrecan, and collagen type IIB [COL2A1]) and synoviocytes (MMP-3 and MMP-13), and results were adjusted to 18S ribosomal subunit mRNA expression. Treatments were performed in triplicate, and the experiment was repeated 4 times.

Results—Cultures treated with MMP-13 or IL-1α had increased media GAG concentration at 48 and 96 hours. Aggrecan and COL2A1 mRNA expression were increased by application of MMP-13 or IL-1α. Gene expression of the catabolic mediator, MMP-3, in cartilage and synoviocytes was increased in cultures treated with MMP-13 or IL-1α. Expression of MMP-13 mRNA in cartilage was increased by IL-1α, but decreased in synoviocytes by MMP-13 treatment.

Conclusions and Clinical Relevance—Results support the use of recombinant MMP-13 in a coculture system of synoviocytes and cartilage explants for the study of osteoarthritis.

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