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Mechanisms of the development and integration of nerve processes: Age-related dynamics of the development of absence epilepsy, changes in the concentration of monoamines and their metabolites in the brain structures of WAG/Rij and Wistar rats, and the dynamics of the disruption of learning and memory

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Abstract

We studied peak-wave activity in WAG/Rij rats at ages of 2 and 6 months. We found age-dependent enhancement of peak-wave discharges. At 2 months, the discharges were rare and weak, whereas 6-month-old rats had robust peak-wave discharges. We measured the concentrations of monoamines and their metabolites in 2- and 6-month-old WAG/Rij and Wistar rats in five brain structures: the prefrontal cortex, nucleus accumbens, hypothalamus, striatum, and hippocampus. In 2-month-old WAG/Rij rats, we found a decrease in the concentration of dopamine (DA) metabolites (HVA) in the prefrontal cortex and striatum compared to Wistar rats. In 6-month-old WAG/Rij rats, we found a considerable decrease in the activity of DA system compared to Wistar rats in all five studied brain structures. Concentrations of both DA and its metabolites decreased. We found impairments of learning and memory of WAG/Rij rats compared to Wistar rats. Impairment of learning and memory were more pronounced in 6-month-old WAG/Rij rats compared to 2-month-old WAG/Rij rats. We believe that the DA system not only responds to emotionally positive states but is also a reward and reinforcement system. An increase in the concentration of DA and its metabolites by madopar prevents disturbances of learning and memory. Our general conclusion is that enhancement of absence epilepsy induces a strong deficit of activity of the mesocorticolimbic and nigrostriatal DA system, which induces depression-like behavior and disturbance of learning and memory in WAG/Rij rats. These are the mechanisms of the development of impairments and the integration of these impairments, as well as the aggravation and widening of pathological states.

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Authors and Affiliations

  1. Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow, Russia

    E. A. Fedosova, A. A. Folomkina, M. A. Kulikov & A. S. Bazyan

  2. Zakusov Research Institute of Pharmacology, Moscow, Russia

    V. S. Kudrin & V. B. Narkevich

  3. ul. Butlerova 5a, Moscow, 117485, Russia

    A. S. Bazyan

Authors
  1. E. A. Fedosova
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  2. A. A. Folomkina
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  3. M. A. Kulikov
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  4. V. S. Kudrin
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  5. V. B. Narkevich
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  6. A. S. Bazyan
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Correspondence to A. S. Bazyan.

Additional information

Original Russian Text © E.A. Fedosova, A.A. Folomkina, M.A. Kulikov, V.S. Kudrin, V.B. Narkevich, A.S. Bazyan, 2017, published in Neirokhimiya, 2017, Vol. 43, No. 4, pp. 317–326.

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Fedosova, E.A., Folomkina, A.A., Kulikov, M.A. et al. Mechanisms of the development and integration of nerve processes: Age-related dynamics of the development of absence epilepsy, changes in the concentration of monoamines and their metabolites in the brain structures of WAG/Rij and Wistar rats, and the dynamics of the disruption of learning and memory. Neurochem. J. 11, 315–324 (2017). https://doi.org/10.1134/S1819712417030035

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  • DOI: https://doi.org/10.1134/S1819712417030035

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