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. 1992 Dec 1;288(Pt 2):357–360. doi: 10.1042/bj2880357

Oscillations of cytosolic free calcium concentration in the presence of intracellular antibodies to phosphatidylinositol 4,5-bisphosphate in voltage-clamped guinea-pig hepatocytes.

J Noel 1, K Fukami 1, A M Hill 1, T Capiod 1
PMCID: PMC1132019  PMID: 1334405

Abstract

In liver cells, the stimulation of alpha 1-adrenoceptors by noradrenaline induces the production of Ins(1,4,5)P3 through the degradation of membrane polyphosphoinositides [PtdIns(4,5)P2]. InsP3 evokes in turn the release of Ca2+ from internal stores. Our results show that the internal perfusion of single guinea-pig hepatocytes with monoclonal anti-PtdInsP2 antibody blocks the rise in cytosolic free Ca2+ concn. ([Ca2+]i) evoked by noradrenaline, an InsP3-dependent agonist, but not by the monohydroxylated bile acid taurolithocholate 3-sulphate, which is known to permeabilize the endoplasmic reticulum. In these conditions, the bile acid elicited either fast or slow fluctuations of [Ca2+]i independently of any InsP3 production. The responses to the bile acid were also observed in the absence of external Ca2+. The presence of intracellular anti-PtdInsP2 antibody does not affect the response to a photolytic release of InsP3 (1.5 microM final concn.) from a caged precursor.

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Selected References

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