Inhibitory effect of AL-3264, a new antiallergic agent, on the Prausnitz-Küstner reaction and leukotriene production in monkeys.

To clarify the antiallergic effect and antiallergic mechanism of AL-3264 (N-[4-[4-(diphenylmethyl)-1-piperazinyl]butyl]-3-(6-methyl-3- pyridyl)acrylamide) in monkeys, its effects on the Prausnitz-Küstner (P-K) reaction, the histamine skin reaction and leukotriene production were examined. In contrast to ketotifen and mepyramine, AL-3264 inhibited the P-K reaction, which is mainly mediated by leukotriene and histamine, more clearly than the skin reaction evoked by histamine alone. AL-3264 also inhibited the leukotriene (LT) production in the broncho-alveolar cells, suggesting that the inhibition of LT production actually contributes to the antiallergic effect of AL-3264.