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The concentration (10(-8)-10(-5) M)-dependent contractile response of norepinephrine was completely inhibited by cyclooxygenase inhibitors but not by a thromboxane synthetase inhibitor. The amount of prostaglandin F2 alpha was significantly increased in the presence of norepinephrine (10(-5) M). Norepinephrine increased the amount of prostaglandin D2, although not significantly. The norepinephrine-evoked prostaglandin release was inhibited by tolazoline (3 x 10(-5) M). These results suggest that norepinephrine evoked the release of prostaglandins, mainly prostaglandin F2 alpha to induce the contraction of the guinea pig trachea.

Evidence for Release of Prostaglandin F2α in Contractile Response of Guinea Pig Trachea to Norepinephrine