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- W1799683217 abstract "Pituitary adenylate-cyclase-activating peptide (PA-CAP) and PACAP-27 are novel hypothalamic peptides that can stimulate adenylate cyclase in cultured anterior pituitary cells. Because these peptides are present in the gut and are homologous with vasoactive intestinal peptide (VIP), itself known to stimulate intestinal ion transport, we examined the effects of these peptides on the T84 colonocyte cell line. Using cells grown on semipermeable supports and mounted in Ussing chambers, we showed that PACAP and PACAP-27 potently activate intestinal secretion. The half-maximal secretory response was produced with 0.5 nmol/L PA-CAP and 0.1 nmol/L PACAP-27. PACAP resembled VIP in that it stimulated a secretory response potentiated by carbachol, inhibited by bumetanide and barium chloride, and not further stimulated by the subsequent addition of VIP. Like VIP, PACAP also stimulated 5' cyclic adenosine monophosphate (cAMP) production and the phosphorylation of cellular proteins known to be substrates for cAMP-dependent protein kinase. In addition, PACAP inhibited 125I-VIP binding to T84 cells, and the secretion it stimulated was reduced by the VIP receptor antagonist, L-8-K. Thus PACAP and PACAP-27 potently stimulate colonocyte ion transport via mechanisms mediated by the VIP receptor and cAMP-dependent signaling." @default.
- W1799683217 created "2016-06-24" @default.
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- W1799683217 date "1992-08-01" @default.
- W1799683217 modified "2023-09-27" @default.
- W1799683217 title "Pituitary adenylate cyclase-activating polypeptide stimulates secretion in T84 cells" @default.
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- W1799683217 doi "https://doi.org/10.1016/0016-5085(92)90844-o" @default.
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