Abstract
This study examined whether maturity of rat brain may be relevant for the sensitivity to diphenyl diselenide (PhSe)2 and diphenyl ditelluride (PhTe)2 on [3H]glutamate uptake and release, in vitro. Brain synaptosomes were isolated from young (14- and 30-day-old) and adult rats and incubated at different concentrations of (PhSe)2 or (PhTe)2. The results demonstrated that the highest concentration (100 μM) of (PhSe)2 and (PhTe)2 inhibited the [3H]glutamate uptake by synaptosomes of brain at all ages. In the adult brain, (PhSe)2 did not inhibit the [3H]glutamate uptake at the lowest concentration (10 μM). The highest concentration of (PhTe)2 inhibited the [3H]glutamate uptake more in the 14-day-old than in the 30-day-old rats or adult rats. In the 30-day-old animals, the highest concentration of (PhSe)2, and the lowest concentration of (PhTe)2, increased the basal [3H]glutamate release. At the highest concentration, (PhTe)2 increased the basal and K+-stimulated glutamate release on all ages evaluated. The results suggest that (PhSe)2 and (PhTe)2 caused alterations on the homeostasis of the glutamatergic system at the pre-synaptic level. These alterations were age-, concentration-, and compound-dependent. The maturity of rat brain is relevant for the glutamatergic system sensitivity to (PhSe)2 and (PhTe)2 .
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The financial support by FAPERGS, CAPES, and CNPq is gratefully acknowledged. C. W. N. is the recipient of CNPq fellowship.
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Souza, A.C.G., Stangherlin, E.C., Ardais, A.P. et al. Diphenyl diselenide and diphenyl ditelluride: neurotoxic effect in brain of young rats, in vitro. Mol Cell Biochem 340, 179–185 (2010). https://doi.org/10.1007/s11010-010-0416-7
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DOI: https://doi.org/10.1007/s11010-010-0416-7