Atriopeptins are potent inhibitors of ACTH secretion by rat anterior pituitary cells in vitro: involvement of the atrial natriuretic factor receptor domain of membrane-bound guanylyl cyclase

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Abstract
The current concept of the regulation of adenohypophysial corticotrophin secretion assigns a stimulatory role to neuropeptides of hypothalamic origin and an inhibitory function to adrenocortical glucocorticoid hormones. It has been shown that in isolated perifused rat anterior pituitary cells atriopeptins (1–28) and (5–28), but not (5–25), potently suppress corticotrophin secretion elicited by 41-residue corticotrophin-releasing factor and arginine vasopressin. The action of atriopeptins is associated with a marked increase in the cellular content of cyclic GMP. Moreover, 8-Br-cyclic GMP, a cell membrane permeant analogue of cyclic GMP, also inhibited secretagogue-stimulated corticotrophin release. It is suggested that atriopeptins of hypothalamic and perhaps of cardiac origin may be functionally significant corticotrophin-release inhibiting factors. Journal of Endocrinology (1990) 125, 39–44

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