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- W1983232072 abstract "Store-operated Ca(2+) entry (SOCE) occurs in diverse cell types in response to depletion of Ca(2+) within the endoplasmic/sarcoplasmic reticulum and functions both to refill these stores and to shape cytoplasmic Ca(2+) transients. Here we report that in addition to conventional SOCE, skeletal myotubes display a physiological mechanism that we term excitation-coupled Ca(2+) entry (ECCE). ECCE is rapidly initiated by membrane depolarization. Like excitation-contraction coupling, ECCE is absent in both dyspedic myotubes that lack the skeletal muscle-type ryanodine receptor 1 and dysgenic myotubes that lack the dihydropyridine receptor (DHPR), and is independent of the DHPR l-type Ca(2+) current. Unlike classic SOCE, ECCE does not depend on sarcoplasmic reticulum Ca(2+) release. Indeed, ECCE produces a large Ca(2+) entry in response to physiological stimuli that do not produce substantial store depletion and depends on interactions among three different Ca(2+) channels: the DHPR, ryanodine receptor 1, and a Ca(2+) entry channel with properties corresponding to those of store-operated Ca(2+) channels. ECCE may provide a fundamental means to rapidly maintain Ca(2+) stores and control important aspects of Ca(2+) signaling in both muscle and nonmuscle cells." @default.
- W1983232072 created "2016-06-24" @default.
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- W1983232072 date "2004-10-25" @default.
- W1983232072 modified "2023-10-15" @default.
- W1983232072 title "Conformational activation of Ca <sup>2+</sup> entry by depolarization of skeletal myotubes" @default.
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- W1983232072 doi "https://doi.org/10.1073/pnas.0403485101" @default.
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