Guanine nucleotides induce Ca2+-independent insulin secretion from permeabilized RINm5F cells.

The role of guanine nucleotides in insulin secretion was investigated in electrically permeabilized RINm5F cells. Ca2+ stimulated insulin release (EC50 approximately 2 microM Ca2+). The GTP stable analog, GTP gamma S, elicited insulin secretion at vanishingly low Ca2+ concentrations (less than 10(-11) M), slightly potentiated the response to intermediate Ca2+ levels, but exerted less than additive effects at maximal Ca2+ concentrations. The GDP analog, GDP beta S, inhibited both GTP gamma S- and Ca2+-stimulated secretion. The action of GTP gamma S was not mediated by cAMP, as the latter only enhanced Ca2+-induced secretion. In contrast, 12-O-tetradecanoylphorbol-13-acetate, an activator of protein kinase C, promoted insulin release at nonstimulatory Ca2+ levels as well as potentiating the Ca2+ response. GTP analogs stimulated hydrolysis of phosphatidylinositol 4,5-bisphosphate (PtdInsP2), as assessed by inositol phosphate generation. However, this could not fully explain guanine nucleotide-induced secretion because: GTP gamma S-stimulated PtdInsP2 breakdown was totally dependent on Ca2+ and abolished at Ca2+ below 10(-11) M; at these Ca2+ levels, activators of protein kinase C were weak or ineffective secretagogues; the GTP analog Gpp(NH)p was much less effective than GTP gamma S in activating PtdInsP2 hydrolysis, while fully mimicking the effect on Ca2+-independent secretion. Both GTP gamma S-induced PtdInsP2 hydrolysis and insulin release were insensitive to pertussis toxin and cholera toxin. The findings point to a guanine nucleotide-regulated site in the activation of insulin secretion different from the known transmembrane signalling systems.

• Publication year

  1987

• Venue

  Journal of Biological Chemistry

• Publication date

  1987-04-15

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1016/s0021-9258(18)61152-4PMID 3031036
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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