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Release of [3H]Dopamine from Striatal and Cerebral Cortical Slices from Rats with Thioacetamide-Induced Hepatic Encephalopathy: Different Responses to Stimulation by Potassium Ions and Agonists of Ionotropic Glutamate Receptors

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Abstract

The effects of depolarizing stimuli; high (50 mM) potassium ions and the glutamate receptor agonists N-methyl-D-aspartate, kainate and 2-amino-3-hydroxy-5-methyl-4-isoxazolepropionate (AMPA) on the release of newly-loaded [3H]dopamine were studied in frontal cortical and striatal slices from control rats and from rats with acute hepatic encephalopathy induced with a hepatotoxin, thioacetamide. Hepatic encephalopathy enhanced the stimulatory effect of potassium ions by 20% in striatal slices and by 34% in frontal cortical slices. In striatal slices the stimulatory effects of N-methyl-D-aspartate and kainate were depressed in hepatic encephalopathy by 46% and 21%, respectively, which may be taken to reflect impaired modulation of striatal dopamine release by glutamate acting at N-methyl-D-aspartate or kainate receptors. In frontal cortical slices, the stimulatory effect of kainate was enhanced by 35% in hepatic encephalopathy but N-methyl-D-aspartate-stimulated release was not affected. The release evoked by 2-amino-3-hydroxy-5-methyl-4-isoxazolepropionate was not affected in hepatic encephalopathy in either brain region. Stimulation of dopamine release in the frontal cortex by depolarization or glutamate acting at kainate receptors could inhibit the activity of descending corticostriatal glutamatergic pathways, further impairing regulation of dopamine release by glutamate in the stratum.

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Authors and Affiliations

  1. Tampere Brain Research Center, Department of Biomedical Sciences, University of Tampere, Tampere, Finland

    Hanna D. Borkowska, Simo S. Oja & Pirjo Saransaari

  2. Department of Neurotoxicology, Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland

    Hanna D. Borkowska & Jan Albrecht

  3. Department of Clinical Physiology, Tampere University Hospital, Tampere, Finland

    Simo S. Oja

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  1. Hanna D. Borkowska
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Borkowska, H.D., Oja, S.S., Saransaari, P. et al. Release of [3H]Dopamine from Striatal and Cerebral Cortical Slices from Rats with Thioacetamide-Induced Hepatic Encephalopathy: Different Responses to Stimulation by Potassium Ions and Agonists of Ionotropic Glutamate Receptors. Neurochem Res 22, 101–106 (1997). https://doi.org/10.1023/A:1027347019707

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