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- W3204295200 abstract "ABSTRACT The acidic luminal pH of lysosomes, maintained within a narrow range, is essential for proper degrative function of the organelle and is generated by the action of a V-type H + ATPase, but other pathways for ion movement are required to dissipate the voltage generated by this process. ClC-7, a Cl - /H + antiporter responsible for lysosomal Cl - permeability, is a candidate to contribute to the acidification process as part of this “counterion pathway”. The signaling lipid PI(3,5)P2 modulates lysosomal dynamics, including by regulating lysosomal ion channels, raising the possibility that it could contribute to lysosomal pH regulation. Here we demonstrate that depleting PI(3,5)P2 by inhibiting the PIKfyve kinase causes lysosomal hyperacidification, primarily via an effect on ClC-7. We further show that PI(3,5)P2 directly inhibits ClC-7 transport and that this inhibition is eliminated in a disease-causing gain-of-function ClC-7 mutation. Together these observations suggest an intimate role for ClC-7 in lysosomal pH regulation." @default.
- W3204295200 created "2021-10-11" @default.
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- W3204295200 date "2021-10-07" @default.
- W3204295200 modified "2023-10-16" @default.
- W3204295200 title "Tonic inhibition of the chloride/proton antiporter ClC-7 by PI(3,5)P2 is crucial for lysosomal pH maintenance" @default.
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- W3204295200 doi "https://doi.org/10.1101/2021.10.07.463477" @default.
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