Stimulation of adrenocorticotropin (ACTH) and growth hormone (GH) release by ouabain: Relationship to calcium

Norman Fleischer, Guy Zimmerman, William Schindler, Max Hutchins

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Studies of the effect of the cardiac glycoside, ouabain, on the release of ACTH and GH from anterior pituitary halves were performed in vitro at 37 C. Ouabain in concentrations of from 1 × 10-5 to 1 × 10-3M stimulated ACTH release in guinea pig tissue and GH release in rat tissue. Ouabain in concentrations of 5 × 10-4M and 1 × 10-3M stimulated ACTH release in rat pituitary tissue. Ouabain–induced hormone release did not occur when pituitary tissue was incubated at 4 C. Incubation of pituitary tissue in the absence of potassium increased by 10-fold the sensitivity to ouabain in terms of ACTH release and directly stimulated the release of GH. In the absence of calcium, ouabain did not stimulate ACTH and GH release. These results can be explained by an interaction of ouabain with Na+, K+–ATPase, the consequence of which is pituitary hormone release. Since ouabain promotes calcium influx in several tissues including the pituitary, and hormone release is calcium dependent, we propose that a Na+/K+ pump–mediated calcium influx modulates ACTH and GH release from the pituitary.

Original languageEnglish (US)
Pages (from-to)1436-1441
Number of pages6
JournalEndocrinology
Volume91
Issue number6
DOIs
StatePublished - Dec 1972

ASJC Scopus subject areas

  • Endocrinology

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