The participation of the subepithelial airway receptor in the bronchoconstriction of monkeys.

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Abstract
In order to elucidate the mechanism of the bronchial response of monkeys to constrictive stimuli, the effects of pretreatment with aerosolized lidocaine, atropine and isoproterenol was studied. Treatment with aerosolized lidocaine and atropine not only extinguished the cough reflex, but also decreased bronchial susceptibility to aerosolized methacholine. Moreover, the pretreatment with lidocaine blocked the histamine challenge, but atropine did not. The aerosolized lidocaine decreased the bronchoconstriction induced with methacholine, but not with histamine. Pretreatment with > 1% of isoproterenol did not extinguish the cough reflex. However, this dose of isoproterenol did suppress an increase in Rrs [total respiratory resistance] due to the challenge of both methacholine and histamine. Isoproterenol also decreased the bronchoconstriction due to the previous challenge by both methacholine and histamine. The antagonistic effects of lidocaine, atropine and isoproterenol on the broncho-constriction of monkeys are discussed in relation to the subepithelial receptor.