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• W2069742419 startingPage "823" @default.
• W2069742419 abstract "Pituitary adenylate cyclase activating polypeptide (PACAP) is produced by hypothalamic neurons which terminate within the median eminence suggesting that it may be a hypophysiotropic hormone. However, little endocrine activity has been ascribed to the peptide. Therefore we studied the effects of PACAP on prolactin (Prl) release from dispersed cultivated rat pituitary cells in vitro using conventional cultures as well as the reverse hemolytic plaque assay (RHPA). Furthermore the effects of the peptide on in vitro GH release were assessed. In addition, the activity of the peptide on in vivo release of Prl and GH was studied in hypothalamus-lesioned animals. PACAP dose dependently inhibited Prl release form dispersed pituitary cells in both, monolayer cell cultures and the RHPA, whereas GH secretion was not affected. In hypothalamus-lesioned rats which have high Prl levels due to the absence of hypothalamic dopamine, PACAP further stimulated Prl release. Serum GH increased more than 20 fold in response to the intravenous PACAP infusion. Thus in vitro (inhibition of Prl release, no effect on GH release) and in vivo (stimulation of both hormones) experiments yielded contradicting effects of PACAP on pituitary hormone release. We suggest that PACAP may stimulate the release of a paracrine, yet unknown factor which in the intact pituitary overrides the direct inhibitory action of PACAP on the lactotropes. The same or another paracrine factor may also enhance in vivo GH release. In cell culture the paracrine factor is diluted by the medium. Therefore the peptide never reaches effective concentrations which are present within the intact pituitary tissue." @default.
• W2069742419 created "2016-06-24" @default.
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• W2069742419 date "1992-01-01" @default.
• W2069742419 modified "2023-09-25" @default.
• W2069742419 title "Contrasting effects of pituitary adenylate cyclase activating polypeptide (PACAP) on in vivo and in vitro prolactin and growth hormone release in male rats" @default.
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• W2069742419 doi "https://doi.org/10.1016/0024-3205(92)90609-s" @default.
• W2069742419 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1522745" @default.
• W2069742419 hasPublicationYear "1992" @default.
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