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• W3121814676 abstract "A robust activity of the lysosomal Ca2+ channel TRPML1 is sufficient to correct cellular defects in neurodegeneration. Importantly, lysosomes are refilled by the endoplasmic reticulum (ER). However, it is unclear how TRPML1 function could be modulated by the ER. Here, we deal with this issue in rat primary cortical neurons exposed to different oxygen conditions affecting neuronal survival. Under normoxic conditions, TRPML1: (1) showed a wide distribution within soma and along neuronal processes; (2) was stimulated by the synthetic agonist ML-SA1 and the analog of its endogenous modulator, PI(3,5)P2 diC8; (3) its knockdown by siRNA strategy produced an ER Ca2+ accumulation; (4) co-localized and co-immunoprecipitated with the ER-located Ca2+ sensor stromal interacting molecule 1 (STIM1). In cortical neurons lacking STIM1, ML-SA1 and PI(3,5)P2 diC8 failed to induce Ca2+ release and, more deeply, they induced a negligible Ca2+ passage through the channel in neurons transfected with the genetically encoded Ca2+ indicator GCaMP3-ML1. Moreover, TRPML1/STIM1 interplay changed at low-oxygen conditions: both proteins were downregulated during the ischemic preconditioning (IPC) while during IPC followed by 1 hour of normoxia, at which STIM1 is upregulated, TRPML1 protein was reduced. However, during oxygen and glucose deprivation (OGD) followed by reoxygenation, TRPML1 and STIM1 proteins peaked at 8 hours of reoxygenation, when the proteins were co-immunoprecipitated and reactive oxygen species (ROS) hyperproduction was measured in cortical neurons. This may lead to a persistent TRPML1 Ca2+ release and lysosomal Ca2+ loss. Collectively, we showed a new modulation exerted by STIM1 on TRPML1 activity that may differently intervene during hypoxia to regulate organellar Ca2+ homeostasis." @default.
• W3121814676 created "2021-02-01" @default.
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• W3121814676 date "2021-01-23" @default.
• W3121814676 modified "2023-10-17" @default.
• W3121814676 title "Lysosomal calcium is modulated by STIM1/TRPML1 interaction which participates to neuronal survival during ischemic preconditioning" @default.
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• W3121814676 doi "https://doi.org/10.1096/fj.202001886r" @default.
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