Inhibition of epinephrine and gonadotropic hormone induced ornithine decarboxylase activity by phenoxybenzamine in the testis of immature rat

The effect of α and β adrenergic receptor blockers on epinephrine and gonadotropic hormone induced ornithine decarboxylase (ODC) activity in the testis of immature rats was studied. Intratesticular injection with phenoxybenzamine at 15 min before treatment with epinephrine or gonadotropic hormones blocked ODC activity. Similar injection with propranolol or practolol had no effect on ODC activity. These results show that α adrenergic receptors are involved in the action of epinephrine and gonadotropic hormones in the testis.