Abstract
Cholecystokinin (CCK-33) (225 Ivy Dog Units intravenously) had no effect on basal growth hormone (GH) secretion but antagonized the GH response to the dopamine receptor agonist, apomorphine HCl (0.5 mg sc) (N = 7), and induced a transient increase in basal prolactin (PRL) secretion (N = 8) in normal men. These findings are similar to those desoribed with neuroleptics and are compatible with an inhibitory effect of CCK-33, or fragments, on dopamine function in man, at least in the hypothalamic-pituitary axis. However, an inhibitory effect of CCK-33 on the release of GH and a stress-induced increase in PRL secretion cannot be excluded.
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