Lysosome exocytosis is involved in astrocyte ATP release after oxidative stress induced by H2O2.

Abstract:

BACKGROUND AND PURPOSE:Studies demonstrated that oxidative damage decreased intracellular ATP level in astrocytes. However, the pathway mediated ATP level decrease is obscure. Our previous study found intracellular ATP could be released via lysosome exocytosis in astrocytes. Here, we explored whether lysosome exocytosis was involved in ATP release during oxidative stress induced by H2O2 in astrocytes. METHODS:Astrocytes were isolated from the cortex of neonatal rats. Intracellular lysosomes and calcium signals were stained in astrocytes before and after H2O2 stimulation. ATP molecules location and ATP level were detected by immunostaining and bioluminescence method, respectively. Extracellular β-Hexosaminidase and LDH were examined by colorimetric method. RESULTS:We found that ATP located in lysosome of astrocytes. H2O2 stimulation resulted in the decrease of lysosomes staining and the increase of extracellular ATP, compared to the control (p < 0.05). At the same time, intracellular Fluo4 signals and β-Hexosaminidase level were also increased (p < 0.05). Extracellular LDH level did not show an increase, suggesting that there is no cell membrane damage after H2O2 stimulation. Glycyl-phenylalanine 2-naphthylamide blocked lysosome exocytosis and inhibited ATP release in astrocytes after H2O2-treatment (p < 0.05). CONCLUSION:Our results indicated that H2O2 induced ATP release from intracellular to extracellular via lysosome exocytosis. The increase of intracellular Ca2+ was necessary for lysosome release under oxidative stress induced by H2O2.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Li Z,Gu Y,Wen R,Shen F,Tian HL,Yang GY,Zhang Z

doi

10.1016/j.neulet.2019.03.046

subject

Has Abstract

pub_date

2019-07-13 00:00:00

pages

251-258

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(19)30209-5

journal_volume

705

pub_type

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