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- W2417363091 abstract "To investigate the effects of tenidap, a new antirheumatic drug, sodium diclofenac, a non-steroidal antiinflammatory drug, and a disease modifying antirheumatic drug, hydroxychloroquine, on the level and expression of interleukin 1 receptors (IL-1R) on synovial fibroblasts from patients with osteoarthritis (OA) and rheumatoid arthritis (RA). In addition, the effect of tenidap on IL-1 stimulated collagenase gene expression was studied.Binding assays were performed using [125I]-IL-1 beta as radioligand. Flow cytometry was done using a specific antibody against type I IL-1R. Protein synthesis was determined by [3H]-leucine incorporation. Levels of expression were determined by Northern Blot for collagenase and by reverse transcription polymerase chain reaction (RT-PCR) for type I IL-1R.Tenidap produced for both OA and RA synovial fibroblasts a dose dependent decrease in the number of IL-1 binding sites/cell. A reduction of 41% (2.5 micrograms/ml) to 81% (at therapeutic concentration, 20 micrograms/ml) was noted for OA, while 29% (2.5 micrograms/ml) to 89% (20 micrograms/ml) was found for RA cells. Diclofenac produced no effect on OA cells, and minimal inhibition of RA synovial fibroblasts was observed only at pharmacological concentration (12%, 300 mg/ml). Hydroxychloroquine had effects similar to diclofenac. The decreased number of IL-1 binding sites/cell by tenidap was time dependent and reached 93% inhibition after 48 h. The effect of tenidap appears to be posttranscriptional, judged by the marked reduction of the type I IL-1R protein/cell and the absence of effect on its mRNA level. Tenidap also markedly reduced the IL-1 induced collagenase expression in synovial fibroblasts.At therapeutic concentrations tenidap is a potent inhibitor of type I IL-1R in OA and RA synovial fibroblasts. The effect of tenidap was considerably more marked than diclofenac or hydroxychloroquine." @default.
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- W2417363091 date "1996-01-01" @default.
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- W2417363091 title "Tenidap reduces the level of interleukin 1 receptors and collagenase expression in human arthritic synovial fibroblasts." @default.
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