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              <p>The food-associated mycotoxin ochratoxin A (OTA) has been demonstrated to be deleterious to numerous cell types including brain cells. Although OTA has been proved to be toxic to astrocytes, no other investigation has been conducted on the impact of OTA on astrocytic functions. In the present study, we evaluated the effect of OTA on one of the major astrocytic functions, i.e. the reabsorption of extracellular glutamate. We found that OTA suppressed glutamate absorption by rat cortical astrocytes with a half inhibitory concentration of 1.3 and 10.1 microM in the absence and presence of fetal calf serum. Although OTA inhibits glutamine synthetase activity, this effect was not involved in OTA-mediated alteration of glutamate absorption since decrease in enzyme activity only occurred at high cytotoxic concentrations of toxin (100 microM). Similarly, alterations in the expression of the excitatory amino-acid transporters were not involved since OTA failed to modify total expression level of GLAST and GLT-1. We found that inhibition of glutamate absorption by OTA was due to a decrease in the expression of GLAST and GLT-1 at the cell surface. We propose that, in addition to being directly toxic to neurons and astrocytes, OTA could also cause the death of brain cells through inhibition of glutamate uptake by astrocytes, leading to the accumulation of extracellular glutamate and ultimately to excitotoxicity.</p>
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