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Vesicular nucleotide transporter is involved in ATP storage of secretory lysosomes in astrocytes.

Abstract：

:Recent studies have suggested that astrocytes release gliotransmitters (i.e., ATP, L-glutamate, D-serine, and peptide hormones) and participate actively in synaptic functioning. Although ATP release from astrocytes modulates the activity of neurons, the mechanisms regulating the ATP release from astrocytes and the source of ATP in astrocytes are not well understood. Recently a vesicular nucleotide transporter (VNUT)/solute carrier family 17, member 9 (SLC17A9) has been identified as a mediator of the active accumulation of ATP into vesicles. Here we show by immunocytochemical analysis under confocal microscope and live cell imaging under total internal reflection fluorescence microscope that lysosome-associated VNUT is responsible for ATP release in astrocytes. VNUT was expressed in both primary cultured cortical astrocytes and glioma cell line C6 cells, and mainly localized on lysosome in the cells. We found that VNUT-associated secretory lysosomes do not fully collapse into the plasma membrane after lysosomal exocytosis. We also found that inhibition of VNUT function by Evans Blue decreased ATP uptake into secretory lysosomes. Depletion and inhibition of endogenous VNUT by small interference RNA and Evans Blue, respectively decreased the amount of ATP release from the cells, whereas overexpression of VNUT increased it. Taken together, these findings indicate that the participation of VNUT in ATP storage in secretory lysosomes during lysosomal exocytosis of ATP from astrocytes.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Oya M,Kitaguchi T,Yanagihara Y,Numano R,Kakeyama M,Ikematsu K,Tsuboi T

doi

10.1016/j.bbrc.2013.07.043

subject

Has Abstract

pub_date

2013-08-16 00:00:00

pages

145-51

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(13)01194-7

journal_volume

438

pub_type

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