The mechanism by which combined treatment with monoamine oxidase inhibitors and a corticosteroid reduces the weight of the accessory sex glands in intact rats by about one half has been studied. Phenelzine sulphate in combination with hydrocortisone acetate given for 30 days to ovariectomized rats reduced the pituitary stores of luteinizing hormone (LH) by 33%. Similar reductions in somatotrophic hormone, corticotrophin and thyroid-stimulating hormone content were found after comparable treatment, whereas luteotrophic hormone increased.
The increase of weight of the seminal vesicles and prostate gland produced by human chorionic gonadotrophin could be partly antagonized by the simultaneous administration of mebanazine and dexamethasone, but the action of testosterone on these glands in castrated animals was not inhibited. Interference with the production and effectiveness of LH is therefore the most likely mode of action by which these drugs effect the reduction of the weight of the accessory sex glands.
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