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Effects of Activation and Blockade of GABAA Receptors on the Activity of the Nitrergic System of the Nucleus Accumbens

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Studies in Sprague–Dawley rats using vital intracerebral microdialysis showed that administration of GABAA receptor antagonist bicuculline (20, 60, and 120 μM) into the nucleus accumbens induced dose-dependent increases in extracellular citrulline (a coproduct of NO synthesis) levels in this structure, and this was almost completely prevented by administration of 7-nitroindazole (0.5 mM), an inhibitor of neuronal NO synthase, into the nucleus accumbens. Administration of the GABAA receptor agonist muscimol into the nucleus accumbens at doses of 10 and 50 μM had no effect on the citrulline level in this structure, while a dose of 150 μM produced a decrease. Administration of NMDA receptor agonist NMDA (100 μM) into this nucleus led to an increase in the citrulline level in the nucleus accumbens, while administration of muscimol (10, 50, and 150 μM) produced dose-dependent decreases. These data provide the first evidence that GABAA receptors control baseline and NMDA receptor stimulation-evoked evoked levels of activity in the nitrergic system of the nucleus accumbens.

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Correspondence to N. B. Saul’skaya.

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Translated from Rossiiskii Fiziologicheskii Zhurnal imeni I. M. Sechenova, Vol. 100, No. 7, pp. 791–801, July, 2014.

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Saul’skaya, N.B., Vinogradova, E.V. Effects of Activation and Blockade of GABAA Receptors on the Activity of the Nitrergic System of the Nucleus Accumbens. Neurosci Behav Physi 46, 146–152 (2016). https://doi.org/10.1007/s11055-015-0211-8

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