Effect of cyproheptadine, desmethylcyproheptadine, γ-amino-butyric acid and sodium valproate on adrenocorticotrophin secretion by cultured pituitary tumour cells from three patients with Nelson's syndrome

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Abstract
The effects of cyproheptadine, desmethylcyproheptadine, serotonin, γ-amino-butyric acid (GABA) and sodium valproate were studied on ACTH secretion by cultured non-enzymatically dispersed pituitary tumour cells from three patients with Nelson's syndrome. Cyproheptadine (1–10 μmol/l) and desmethylcyproheptadine (1–10 μmol/l) suppressed ACTH secretion significantly (P <0·01), while serotonin (10 μmol/l) did not have a direct effect. Serotonin was also not able to reverse the (desmethyl)cyproheptadine-mediated inhibition of ACTH release. Sodium valproate and GABA did not exert a direct effect on hormone release by these cultured pituitary tumour cells. It is suggested that cyproheptadine-mediated inhibition of ACTH release in Nelson's syndrome might be effected by a direct non-serotonin-related effect on the pituitary tumour, while sodium valproate suppresses ACTH release by a suprahypophysial action.

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