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- W2020232110 abstract "Synaptotagmin 2 (Syt2) functions as a low affinity, fast exocytic Ca(2+) sensor in neurons, where it is activated by Ca(2+) influx through voltage-gated channels. Targeted insertion of lacZ into the mouse syt2 locus reveals expression in mucin-secreting goblet cells of the airways. In these cells, rapid Ca(2+) entry from the extracellular medium does not contribute significantly to stimulated secretion (Davis, C. W., and Dickey, B. F. (2008) Annu. Rev. Physiol. 70, 487-512). Nonetheless, Syt2(-/-) mice show a severe defect in acute agonist-stimulated airway mucin secretion, and Syt2(+/-) mice show a partial defect. In contrast to Munc13-2(-/-) mice (Zhu, Y., Ehre, C., Abdullah, L. H., Sheehan, J. K., Roy, M., Evans, C. M., Dickey, B. F., and Davis, C. W. (2008) J. Physiol. (Lond.) 586, 1977-1992), Syt2(-/-) mice show no spontaneous mucin accumulation, consistent with the inhibitory action of Syt2 at resting cytoplasmic Ca(2+) in neurons. In human airway goblet cells, inositol trisphosphate receptors are found in rough endoplasmic reticulum that closely invests apical mucin granules, consistent with the known dependence of exocytic Ca(2+) signaling on intracellular stores in these cells. Hence, Syt2 can serve as an exocytic sensor for diverse Ca(2+) signaling systems, and its levels are limiting for stimulated secretory function in airway goblet cells." @default.
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- W2020232110 date "2009-04-01" @default.
- W2020232110 modified "2023-09-30" @default.
- W2020232110 title "Synaptotagmin 2 Couples Mucin Granule Exocytosis to Ca2+ Signaling from Endoplasmic Reticulum" @default.
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- W2020232110 doi "https://doi.org/10.1074/jbc.m807849200" @default.
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