Interaction of Nitric Oxide Donors and Ascorbic Acid on D-[3H]Aspartate Efflux from Rat Striatal Slices |
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Authors: | Reiser Michael Schild Lorenz Keilhoff Gerburg Wolf Gerald |
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Institution: | (1) Institute of Medical Neurobiology, Otto-von-Guericke University of Magdeburg, Leipziger Str. 44, Magdeburg, Germany;(2) Department of Pathobiochemistry, Otto-von-Guericke University of Magdeburg, Leipziger Str. 44, D-39120 Magdeburg, Germany |
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Abstract: | There are conflicting reports in the literature concerning the neuroprotective effect of ascorbic acid on excitotoxic processes in which excessive glutamate release and nitric oxide are supposed to be major factors. To study the influence of ascorbate on the nitric oxide modulated glutamate release rat striatal slices, preloaded with the tritiated glutamate analog D-aspartate, were used. The high potassium-induced efflux of D-3H]aspartate was concentration dependently stimulated by the nitric oxide donors sodium nitroprusside, S-nitroso-N-acetylpenicillamine (SNAP) or 5-amino 3-morpholinyl-1,2,3-oxadiazolium chloride (SIN-1), as well as by solutions of gaseous nitric oxide and, interestingly, by cyanide. Only the stimulation of D-3H]aspartate release by SNAP and nitroprusside was affected by ascorbate in terms of a highly significant potentiation. Ascorbate was shown to exert its effect primarily by influencing the decomposition of these nitric oxide donors rather than by a direct interaction of ascorbate with nitric monoxide on glutamate release. |
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Keywords: | Nitric oxide ascorbic acid glutamate release striatal slices |
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