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Time course of changes in the concentrations of monoamines in the brain structures of pentylenetetrazole-kindled rats

  • Basic Neurosciences, Genetics and Immunology - Original Article
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Abstract

This work attempted to “biochemically” map the brain structures that are recruited at the different stages of pentylenetetrazole (PTZ) kindling (in a model of temporal lobe epilepsy induced by a repeated, systemic administration of PTZ, at a subconvulsive dose of 35 mg/kg). We observed substantial changes in the levels of noradrenaline (NA), 5-hydroxytryptamine (5-HT), dopamine (DA), and their metabolites in the brain structures known to be recruited in the course of kindling, i.e., the piriform, entorhinal and prefrontal cortices, and the hippocampus (in vitro). Kindling of seizures induced time-, seizure-, and structure-dependent increases in the local levels of NA, 5-HT, 5-hydroxyindolacetic acid, DA, homovanillic acid, and 3,4-dihydroxyphenylacetic acid. Surprisingly, limited changes in monoamines (NA and 5-HT) were found in the amygdala. The most potent and widespread effects concerned the serotonergic system, indicating a possible protective role of its enhanced activity in the control of the kindling of seizures. These new data indicate a pattern of changes in the basal activity of local monoaminergic innervation of brain limbic structures, accompanying the induction and propagation of seizures.

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Acknowledgments

The study was supported by Grant No. N40102632/0640 from the Ministry of Science and Higher Education, Warsaw, Poland and by a statutory Grant No. 501-003-09049 from the Institute of Psychiatry and Neurology, Warsaw, Poland.

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Authors and Affiliations

  1. Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, 26/28 Krakowskie Przedmieście Street, 00-927, Warsaw, Poland

    Janusz Szyndler, Piotr Maciejak & Adam Płaźnik

  2. Department of Neurochemistry, Institute of Psychiatry and Neurology, 9 Sobieskiego Street, 02-957, Warsaw, Poland

    Piotr Maciejak, Danuta Turzyńska, Alicja Sobolewska, Andrzej Bidziński & Adam Płaźnik

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  1. Janusz Szyndler
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  2. Piotr Maciejak
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  3. Danuta Turzyńska
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  4. Alicja Sobolewska
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  5. Andrzej Bidziński
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  6. Adam Płaźnik
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Correspondence to Janusz Szyndler.

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A. Bidziński: Deceased.

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Szyndler, J., Maciejak, P., Turzyńska, D. et al. Time course of changes in the concentrations of monoamines in the brain structures of pentylenetetrazole-kindled rats. J Neural Transm 117, 707–718 (2010). https://doi.org/10.1007/s00702-010-0414-7

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  • DOI: https://doi.org/10.1007/s00702-010-0414-7

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