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. 1988 Apr 15;251(2):435–440. doi: 10.1042/bj2510435

Regulation of inositol 1,4,5-trisphosphate metabolism in insulin-secreting RINm5F cells.

T J Biden 1, L Vallar 1, C B Wollheim 1
PMCID: PMC1149021  PMID: 3041962

Abstract

Factors underlying the transience of inositol 1,4,5-trisphosphate [Ins(1,4,5)P3] accumulation following muscarinic stimulation of RINm5F cells were examined. Transience was not due to a protein kinase C-mediated stimulation of Ins(1,4,5)P3 dephosphorylation, since pretreatment of cells with tetradecanoyl-phorbol acetate (TPA) did not alter the rate of this conversion. However, preincubation with TPA did inhibit carbamoylcholine-stimulated Ins(1,4,5)P3 formation. In permeabilized cells, the conversion of Ins(1,4,5)P3 to inositol 1,3,4,5-tetrakisphosphate [Ins(1,3,4,5)P4] was slightly enhanced in the presence of TPA or cyclic AMP, but much more markedly by raising the Ca2+ concentration from 10(-7) M to 10(-6) or 10(-5) M. In intact cells the most rapid rate of accumulation of Ins(1,4,5)P3 and Ins(1,3,4,5)P4 occurred in the first 2 s following stimulation, whereas the levels of inositol 1,4-bisphosphate were not increased until after 5 s. This suggests that Ins(1,4,5)P3 kinase is chiefly responsible for the early disposal of Ins(1,4,5)P3 following cellular stimulation. The results are consistent with the proposal that the transient accumulation of Ins(1,4,5)P3 is due both to its enhanced metabolism via the Ca2+-calmodulin-sensitive Ins(1,4,5)P3 kinase, as well as a down-regulation of phosphatidylinositol 4,5-bisphosphate hydrolysis.

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Selected References

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