Inhibition of prostaglandin formation from [14C]arachidonic acid by rat peritoneal leucocytes occurred with nonsteroidal anti-inflammatory drugs, their order of potency being indomethacin greater than piroxicam greater than naproxen greater than ibuprofen greater than isoxicam. At the lowest concentration tested (1 microgram ml-1), indomethacin markedly increased the accumulation of lipoxygenase products in the cell incubates. Naproxen, ibuprofen or piroxicam 1 or 10 micrograms ml-1 resulted in smaller increases of lipoxygenase products, and there was only a small rise with these concentrations of isoxicam.
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Tavares et al. (1985) studied this question.
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