6-Sulphanilamidoindazole-induced arthritis in rats: substance effects and acute-phase reaction.

Arthritis induced by 6-sulphanilamidoindazole in older rats is not inhibited by a one-week treatment with superoxide dismutase, peroxidase or desferrioxamine. It is concluded that oxygen radicals hardly play a special part in the pathogenesis of 6-SAI arthritis. C-reactive protein and caeruloplasmin are demonstrated to be acute-phase reactants also in 6-SAI arthritis, although on the whole the acute-phase reaction is relatively weak. The steroid dexamethasone and the nonsteroid benoxaprofen caused strong antiinflammatory activity at low doses. The data presented complete the picture of 6-SAI arthritis as a special inflammatory reaction in rats.