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速激肽NK－2受体拮抗剂SR－48968（1μmol／L）能抑制抗原（OA，10mg／L）诱导的气管和支气管平滑肌收缩；NK－1受体拮抗剂CP－96345（1μmol／L）仅抑制支气管的收缩．两药均抑制辣椒素和P物质引起的支气管平滑肌收缩，对组胺和氨甲酸胆碱引起气管、支气管收缩作用无明显影响．结果证明速激肽参与抗原诱导的气道平滑肌收缩，速激肽受体拮抗剂具有抗过敏性哮喘的作用．
The NK-1 receptor antagonist SR-48968 (1μmol / L) inhibited the tracheal and bronchial smooth muscle contraction induced by the antigen (OA, 10mg / L) ) Only inhibits the bronchial contraction. Both drugs inhibited the bronchial smooth muscle contraction induced by capsaicin and substance P, and had no significant effect on the trachea and bronchoconstriction induced by histamine and carbamate. The results demonstrate that tachykinins are involved in antigen-induced airway smooth muscle contraction and tachykinin receptor antagonists have anti-allergic asthma effects.