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Arsenate accumulation and arsenate-induced glutathione export in astrocyte-rich primary cultures.

Abstract：

:Arsenate is a toxic compound that has been connected with neuropathies and impaired cognitive functions. To test whether arsenate affects the viability and the GSH metabolism of brain astrocytes, we have used primary astrocyte cultures as model system. Incubation of astrocytes for 2h with arsenate in concentrations of up to 10mM caused an almost linear increase in the cellular arsenic content, but did not acutely compromise cell viability. The presence of moderate concentrations of arsenate caused a time- and concentration-dependent loss of GSH from viable astrocytes which was accompanied by a matching increase in the extracellular GSH content. Half-maximal effects were observed for arsenate in a concentration of about 0.3 mM. The arsenate-induced stimulated GSH export from astrocytes was prevented by MK571, an inhibitor of the multidrug resistance protein 1. Exposure of astrocytes to arsenite increased the specific cellular arsenic content and stimulated GSH export to values that were similar to those observed for arsenate-treated cells, while dimethylarsinic acid was less efficiently accumulated by the cells and did not modulate cellular and extracellular GSH levels. The observed strong stimulation of GSH export from astrocytes by arsenate suggests that disturbances of the astrocytic GSH metabolism may contribute to the observed arsenic-induced neurotoxicity.

journal_name

Neurochem Int

journal_title

Neurochemistry international

authors

Meyer N,Koehler Y,Tulpule K,Dringen R

doi

10.1016/j.neuint.2013.03.014

subject

Has Abstract

pub_date

2013-06-01 00:00:00

pages

1012-9

issue

7

eissn

0197-0186

issn

1872-9754

pii

S0197-0186(13)00107-1

journal_volume

62

pub_type

杂志文章

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