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- W2032037407 abstract "Abstract We have recently demonstrated that the accumulation of labile zinc in lysosomes during oxidative stress causes lysosomal membrane permeabilization (LMP) in cultured hippocampal neurons. Since autophagy involves fusion of autophagic vacuoles (AVs) with lysosomes, zinc accumulation may start in AVs. In the present study, we examined the role of endogenous zinc in H 2 O 2 ‐induced autophagy and cell death in mouse astrocyte cultures. Live‐cell confocal imaging of astrocytes transfected with GFP‐LC3 revealed that the number of AVs positive for LC3 (microtubule‐associated protein 1 light chain 3) increased following exposure to H 2 O 2 or ferrous chloride (FeCl 2 ). Staining of RFP‐LC3‐transfected astrocytes with FluoZin‐3 indicated that the levels of labile zinc increased in AVs as well as in the cytosol and nuclei. The majority of AVs were double‐stained with LysoTracker, indicating that they were fused with lysosomes. Chelation of zinc with tetrakis [2‐pyridylmethyl]ethylenediamine (TPEN) decreased the number of AVs in H 2 O 2 ‐treated astrocytes, whereas exposure to zinc increased their number, suggesting that dysregulation of zinc homeostasis is mechanistically linked to autophagy. Unexpectedly, inhibition of autophagy blocked the rise in labile zinc levels. Astrocytic death induced by H 2 O 2 was accompanied by LMP. Autophagy inhibitors (3‐methyladenine, bafilomycin‐1) or TPEN attenuated LMP and cell death in astrocytes. These results support the possibility that endogenous zinc plays a key role in autophagy under oxidative stress in astrocytes, and suggest that autophagy is a necessary preceding event for LMP and cell death in oxidative injury. © 2009 Wiley‐Liss, Inc." @default.
- W2032037407 created "2016-06-24" @default.
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- W2032037407 date "2009-02-19" @default.
- W2032037407 modified "2023-10-16" @default.
- W2032037407 title "Oxidative injury triggers autophagy in astrocytes: The role of endogenous zinc" @default.
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- W2032037407 doi "https://doi.org/10.1002/glia.20854" @default.
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