Volume 107, Issue 1-6 pp. 183-192

The long-term effect of a short course of transforming growth factor-β1 on rat articular cartilage

RAED ITAYEM

Corresponding Author

RAED ITAYEM

Department of Immunology, Microbiolpgy, Pathology and Infectious Diseases, Karolinska Institutet, Huddinge Hospital, Huddinge, Sweden

Division of Pathology, Huddinge Hospital F42, S-141 86 Huddinge, Sweden.Search for more papers by this author
SILWA MENGARELLI-WIDHOLM

SILWA MENGARELLI-WIDHOLM

Department of Immunology, Microbiolpgy, Pathology and Infectious Diseases, Karolinska Institutet, Huddinge Hospital, Huddinge, Sweden

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FINN P. REINHOLT

FINN P. REINHOLT

Department of Immunology, Microbiolpgy, Pathology and Infectious Diseases, Karolinska Institutet, Huddinge Hospital, Huddinge, Sweden

Department of Pathology, University of Oslo, National Hospital, Oslo, Norway

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First published: 15 August 2009
Citations: 16

Abstract

The long-term effect of 3 days' topical administration of TGF-β1 on unloaded articular cartilage in growing rats was investigated. Three to five rats were sacrificed on days 15, 30, 45, 60 and 90 after the last injection and the patellas were subjected to light and electron microscopic evaluation. The patellas showed age-related changes when entering the maturation phase. Absence of a hypertrophic zone and formation of a subchondral bone plate were observed in both treated rats and controls from that time point. Reduction of total cell amount was observed between older and younger patellas in both treated rats and controls. TGF-β1 treatment resulted in accelerated maturation and ageing. Furthermore, the administration of TGF-β1 resulted in a higher unmineralized cartilage with an increased total amount of cells in the intermediate zone. Matrix areas showing ultrastructural features of disturbed matrix composition were seen in the deeper part of this zone at all time points, but in the treated patellas only. The present results indicate that TGF-β1 treatment may induce changes in articular cartilage in some respects similar to those seen in the early stages of degenerative and inflammatory joint diseases.

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