[Participation of histamine in activating the hypothalamo-hypophyseo-adrenal system during stress]

In 289 male rats, accumulation of histamine in diencephalon, augmentation of activity in the hypothalamus, and increase of the ACTH content in the hypophysis and 11-OCS in adrenal and plasma were revealed under a functional stress for the hypothalamo-hypophyseal-adrenal system (HHAS). Further accumulation of histamine was associated with increased secretion of CRF, ACTH, and 11-OCS. Blocking of histamine by diphenylhydramine hydrochloride (10.0 mg/kg i. p. -- 30 min before the experiment) depressed the rate and intensity of the initial reaction of HHAS activation.