Expression of platelet-derived growth factors C and D in the synovial membrane of patients with rheumatoid arthritis and osteoarthritis

Arthritis and Rheumatism
Dirk PohlersRaimund W Kinne

Abstract

To investigate the messenger RNA (mRNA) and protein expression of the recently discovered platelet-derived growth factor C (PDGF-C) and PDGF-D in the synovial membrane (SM) of patients with rheumatoid arthritis (RA) and osteoarthritis (OA) and to assess the localization and cellular source of these proteins in the SM and their functional influence on synovial fibroblasts. Expression of mRNA for PDGFs A, B, C, and D as well as for PDGF receptor (PDGFR) alpha and beta chains in RA and OA SM samples was assessed by real-time reverse transcription-polymerase chain reaction. Protein levels of PDGF-C and PDGF-D were quantified by immunoblotting. Regional and cellular localization of PDGF-C and PDGF-D in the SM was investigated by double-staining immunohistochemistry. In addition, the influence of PDGF-D on the proliferation of synovial fibroblasts and their matrix metalloproteinase (MMP-1) mRNA expression were determined. The expression of mRNA for PDGFs A, B, and C and for PDGFR alpha and beta chains was comparable in RA and OA SM samples; in contrast, the expression of mRNA for PDGF-D was significantly higher in OA SM. PDGF-C protein was not differentially expressed in OA and RA. The expression of PDGF-D protein was significantly h...Continue Reading

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