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• W3141348603 endingPage "119020" @default.
• W3141348603 startingPage "119020" @default.
• W3141348603 abstract "Inside cells, the endoplasmic reticulum (ER) forms the largest Ca 2+ store. Ca 2+ is actively pumped by the SERCA pumps in the ER, where intraluminal Ca 2+ -binding proteins enable the accumulation of large amount of Ca 2+ . IP 3 receptors and the ryanodine receptors mediate the release of Ca 2+ in a controlled way, thereby evoking complex spatio-temporal signals in the cell. The steady state Ca 2+ concentration in the ER of about 500 μM results from the balance between SERCA-mediated Ca 2+ uptake and the passive leakage of Ca 2+ . The passive Ca 2+ leak from the ER is often ignored, but can play an important physiological role, depending on the cellular context. Moreover, excessive Ca 2+ leakage significantly lowers the amount of Ca 2+ stored in the ER compared to normal conditions, thereby limiting the possibility to evoke Ca 2+ signals and/or causing ER stress, leading to pathological consequences. The so-called Ca 2+ -leak channels responsible for Ca 2+ leakage from the ER are however still not well understood, despite over 20 different proteins have been proposed to contribute to it. This review has the aim to critically evaluate the available evidence about the various channels potentially involved and to draw conclusions about their relative importance. • ER Ca 2+ levels impact ER biology and intracellular Ca 2+ signaling. • Over 20 proteins have been proposed to act as ER Ca 2+ -leak channels. • Ca 2+ -leak channels play an important role in maintaining ER Ca 2+ levels. • Dysregulated IP 3 Rs, translocon and presenilins form the main candidates as ubiquitously expressed ER Ca 2+ -leak channels. • Other ER Ca 2+ -leak channels may be of crucial importance in specialized cells and/or under specific conditions." @default.
• W3141348603 created "2021-04-13" @default.
• W3141348603 creator A5019565239 @default.
• W3141348603 creator A5023281323 @default.
• W3141348603 creator A5048025841 @default.
• W3141348603 date "2021-06-01" @default.
• W3141348603 modified "2023-10-02" @default.
• W3141348603 title "A comprehensive overview of the complex world of the endo- and sarcoplasmic reticulum Ca2+-leak channels" @default.
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