Abstract
IN many cell types, receptor activation of phosphoinositidase C results in an initial release of intracellular Ca2+ stores followed by sustained Ca2+ entry across the plasma membrane. Inositol 1,4,5-trisphosphate is the mediator of the initial Ca2+ release1, although its role in the mechanism underlying Ca2+ entry remains controversial1–6. We have now used two techniques to introduce inositol phosphates into mouse lacrimal acinar cells and measure their effects on Ca2+ entry: microinjection into cells loaded with Fura-2, a fluorescent dye which allows the measurement of intra-cellular free calcium concentration by microspectrofluorimetry, and perfusion of patch clamp pipettes in the whole-cell configuration while monitoring the activity of Ca2+-activated K+ channels as an indicator of intracellular Ca2+. We report here that inositol 1,4,5-trisphosphate serves as a signal that is both necessary and sufficient for receptor activation of Ca2+ entry across the plasma membrane in these cells.
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Bird, G., Rossier, M., Hughes, A. et al. Activation of Ca2+ entry into acinar cells by a non-phosphorylatable inositol trisphosphate. Nature 352, 162–165 (1991). https://doi.org/10.1038/352162a0
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DOI: https://doi.org/10.1038/352162a0
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