S1-receptor participation in serotonin-induced pulmonary edema in the dog.

A canine lung-perfusion preparation was used to evaluate the role of serotonin receptor subtype in the development of serotonin-induced pulmonary edema. Ketanserin, an S2-receptor antagonist, blocked an increase in pulmonary arterial pressure caused by serotonin, but not the development of pulmonary edema. Methysergide, an S1- and S2-receptor antagonist, prevented the increase in pulmonary arterial pressure and edema formation caused by serotonin. These results suggest that the S1-receptor may participate in the development of pulmonary edema.