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Proceedings of the National Academy of Sciences of Belarus, Medical series

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Dopaminergic system: architectonics and functions, afferent signals convergence

Abstract

The accent in the review is made on one of signaling molecules of nervous tissue - dopamine (DA) - and its role in inputoutput relationships in subcortical brain regions. Taking into account the selective death of DA-ergic neurons of mesencephalic Substantia nigra (SN) compact zone in Parkinson’s disease, special attention is paid to peculiarities of electrophysiological characteristics of DA-ergic neurons both in SN (striatonigral dopaminergic system) and ventrotegmental area (VTA, mesolimbic dopaminergic system), their efferent and afferent connections. Differences in DA expression by DA-ergic neurons of SN and VTA in common with glutamate and GABA were marked. The role of afferent signals convergence (input) from (output) glutamate-, GABA-, serotonin-, dopamine-, noradrenalin- and acetylcholinergic neurons of brain stem in DA-ergic neurons functioning was shown. The dependence of transmitted by DA information both from the type of DA-ergic neuron discharge (tonic or phasic) and the type of activated receptors (D1 or D2) was noted. The assumption on the role of DA-ergic neurons of striatum ectopic population increase - as endogenous protective reaction in DA-ergic neurons of SN functioning decrease in Parkinson’s disease - is made.

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Tropnikova G.K., Kilin S.Ya., Kulchitsky V.A. Dopaminergic system: architectonics and functions, afferent signals convergence. Proceedings of the National Academy of Sciences of Belarus, Medical series. 2014;(3):96-112. (In Russ.)

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ISSN 1814-6023 (Print)
ISSN 2524-2350 (Online)