Abstract
TAMURA, G., SAKAI, K., TANIGUCHI, Y., IIJIMA, H., HONMA, M., KATSUMATA, U., MARUYAMA, N., AIZAWA, T. and TAKISHIMA, T. Neurokinin A-Induced Bronchial Hyperresponsiveness to Methacholine in Japanese Monkeys. Tohoku J. Exp. Med., 1989, 159 (1), 69-73-The present study was designed to investigate whether neurokinin A (NKA) and substance P (SP) increase bronchial responsiveness to methacholine (MCh). Before and 1, 2, 3 and 4 weeks after three Japanese monkeys had inhaled 10-8M NKA and 10-8M SP for 2min, bronchial responsiveness to inhaled MCh was evaluated. Pulmonary flow resistance (R1) and dynamic lung compliance (Cdyn) were used as pulmonary function tests. Dose-response curves of R1 to inhaled MCh were shifted to the left 1 to 4 weeks after NKA treatment, compared with that obtained before treatment. However, SP treatment did not change the R1 dose-response curve. Thus, bronchial responsiveness to MCh was increased by inhalation of 10-8M NKA in Japanese monkeys.
