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Rheumatology 2001; 40: 256-261
© 2001 British Society for Rheumatology

Increased cell proliferation and associated expression of PDGFRß causing hypercellularity in patellar tendinosis

C. G. Rolf, B. S. C. Fu, A. Pau, W. Wang and B. Chan

Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong

Objective. This study assessed cellularity in patellar tendinosis with respect to cell proliferation and the expression of platelet-derived growth factor receptor ß (PDGFRß).

Methods. Surgical samples were taken from 11 patients fulfilling criteria of patellar tendinosis and from 12 matched controls. Standard immunohistochemistry methods were used to detect expression of PDGFRß and proliferation cell nuclear antigen (PCNA). Results were analysed by computer-assisted microscopy. Tendon cells were isolated from nine tendinosis and eight control tissues for cell culture.

Results. Increased cellularity (P<0.001) was observed in tendinosis tissues compared with controls, and also a higher proliferative index (P<0.001). Increased expression of PDGFRß was demonstrated (P<0.001). Cultured tendinosis cells showed a higher proliferation rate than controls (P<0.001). This was maintained when the cells were cultured under various conditions of serum supplementation (P<0.01). Tendinosis cells also showed a higher proliferation rate (P<0.01) in medium containing 10 ng/ml PDGF.

Conclusion. Hypercellularity in patellar tendinosis is caused by increased cell proliferation and is associated with increased expression of PDGFRß.

KEY WORDS: Tendinosis, Hypercellularity, Patellar tendon, PCNA, PDGF receptor beta.

Correspondence to: C. G. Rolf.


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