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The stimulatory effect of histamine on rabbit and rat testicular capsule was blocked by the H1 blocker, diphenhydramine, but not by the H2 blocker, cimetidine, suggesting the presence of H1 histamine receptors in both rabbit and rat testicular capsules. In the rabbit, both anti-prostaglandin F (PGF) and anti-prostaglandin E (PGE) effaced spontaneous autorhythmic contractions. They markedly inhibited PGF 2 alpha, PGE1 and histamine-stimulated contractions of the rabbit testicular capsule. In the rat, anti-PGF or anti-PGE had no inhibitory effects on the capsular tone, but they both inhibited the stimulatory effects of histamine. These data suggest that the action of histamine on the rabbit and rat testicular capsules could be due partly to a secondary release of the PG's, PGE2 and PGF2 alpha.

Histamine H1 Receptors and Prostaglandin-Histamine Interactions Modulating Contractility of Rabbit and Rat Testicular Capsules in Vitro 1