Possible mediation of GABA induced growth hormone secretion by increased calcium-flux in neonatal pituitaries

Zs Ács, L. Zsom, G. B. Makara

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Gamma-aminobutyric acid (GABA) stimulates growth hormone (GH) secretion from pituitaries of young (less than 20-day old) rats (1,2). Present work revealed that the GH stimulatory effect of GABA was abolished in the absence of calcium and response was attenuated by Nifedipine. The calcium efflux from 45CaCl2 preloaded neonatal pituitaries was enhanced by GABA or by muscimol, and this effect was antagonized by the GABA antagonist picrotoxin. In pituitaries of 21 day old or adult rats GABA stimulated neither GH secretion nor calcium efflux. These results indicate that in neonatal pituitaries GABA influences calcium transport and its GH releasing effect is linked to the presence of calcium.

Original languageEnglish
Pages (from-to)273-279
Number of pages7
JournalLife Sciences
Volume50
Issue number4
DOIs
Publication statusPublished - 1992

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)

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