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Dopamine-Producing Neurons in Rat Ontogeny: Phenotypic Features Underlying Molecular Mechanisms of Secretion and Regulation

  • MAMMALIAN DEVELOPMENTAL BIOLOGY
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Abstract—

Dopamine (DA), which is synthesized in DA-ergic neurons and so-called monoenzymatic neurons, is involved in the regulation of neuronal differentiation during the critical period of morphogenesis. The aim of the present study was to examine phenotypic features of DA-producing neurons in several brain regions, including the striatum, suprachiasmatic nucleus, and arcuate nucleus, during rat ontogeny starting from embryonic day 18 (E18) to postnatal day 60 (P60). The enzymes of DA synthesis tyrosine hydroxylase (TH) and aromatic amino acid decarboxylase (AAAD), vesicular monoamine transporters (VMAT), and D1 and D2 DA receptors were used as markers for functional activity of DA neurons. Expression of these markers was studied using double immunohistochemical labeling of TH and AAAD or PCR assay of TH, AAAD, VMAT1, VMAT2, and D1 and D2 DA receptors. In the striatum, mRNAs of all mentioned markers were revealed within the whole period of ontogeny studied, bienzymatic TH and AAAD-immunopositive neurons were observed at E18, whereas monoenzymatic TH- or AAAD-containing neurons were observed at P60 only. In the suprachiasmatic nucleus, monoenzymatic AAAD neurons coexist with monoenzymatic TH-immunoreactive fibers, which innervate the ventral part of the nucleus, in the early postnatal period (P10). At P10 in the suprachiasmatic nucleus, the TH, VMAT1, and VMAT2 genes are not expressed; however, transcripts of the D1 and D2 genes were detected. The arcuate nucleus of rat embryos contained only monoenzymatic TH neurons in the ventrolateral area and AAAD neurons in the dorsomedial area in the late prenatal period (E21). At the same time TH, AAAD, VMAT2, D1, and D2 mRNAs were expressed in both parts of the arcuate nucleus. Thus, during rat ontogeny, nondopaminergic neurons containing one of the enzymes, TH or AAAD, are present in the striatum, suprachiasmatic nucleus, and arcuate nucleus, which allows for suggesting the cooperative synthesis of dopamine in these brain structures.

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Funding

This study was supported by the Russian Science Foundation, project no. 17-14-01422.

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Authors and Affiliations

  1. Kol’tsov Institute of Developmental Biology, Russian Academy of Sciences, 119334, Moscow, Russia

    A. I. Kurtova, L. K. Dil’mukhametova, T. S. Pronina, E. R. Mingazov, Y. O. Nikishina, K. K. Sukhinich & M. V. Ugrumov

  2. National Research University Higher School of Economics, 101000, Moscow, Russia

    M. V. Ugrumov

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  1. A. I. Kurtova
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  2. L. K. Dil’mukhametova
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  3. T. S. Pronina
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  4. E. R. Mingazov
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  5. Y. O. Nikishina
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  6. K. K. Sukhinich
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  7. M. V. Ugrumov
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Correspondence to M. V. Ugrumov.

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Statement on the welfare of animals. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

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Translated by M. Stepanichev

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Kurtova, A.I., Dil’mukhametova, L.K., Pronina, T.S. et al. Dopamine-Producing Neurons in Rat Ontogeny: Phenotypic Features Underlying Molecular Mechanisms of Secretion and Regulation. Russ J Dev Biol 51, 57–64 (2020). https://doi.org/10.1134/S1062360420010038

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  • DOI: https://doi.org/10.1134/S1062360420010038

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