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Mesencephalic dopaminergic neurons in primary cultures express functional neurotensin receptors

A Brouard, D Pelaprat, C Dana, M Vial, AM Lhiaubet and W Rostene
Journal of Neuroscience 1 April 1992, 12 (4) 1409-1415; DOI: https://doi.org/10.1523/JNEUROSCI.12-04-01409.1992
A Brouard
Institut National de la Sante et de la Recherche Medicale, Unite 339, Hopital Saint Antoine, Paris, France.
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D Pelaprat
Institut National de la Sante et de la Recherche Medicale, Unite 339, Hopital Saint Antoine, Paris, France.
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C Dana
Institut National de la Sante et de la Recherche Medicale, Unite 339, Hopital Saint Antoine, Paris, France.
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M Vial
Institut National de la Sante et de la Recherche Medicale, Unite 339, Hopital Saint Antoine, Paris, France.
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AM Lhiaubet
Institut National de la Sante et de la Recherche Medicale, Unite 339, Hopital Saint Antoine, Paris, France.
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W Rostene
Institut National de la Sante et de la Recherche Medicale, Unite 339, Hopital Saint Antoine, Paris, France.
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Abstract

The cellular distribution and functional aspects of neurotensin (NT) binding sites in rat mesencephalic cells in primary culture were investigated by an original approach combining anatomical and biochemical studies. Using a double-labeling protocol combining 125I-NT receptor radioautography and tyrosine hydroxylase (TH) immunocytochemistry, we obtained the first direct visualization of NT binding sites on TH-immunoreactive neurons. Eighty percent of the TH neurons were endowed with NT binding sites, which can be observed on both cell bodies and processes. TH-immunoreactive neurons were characterized as dopaminergic neurons by their ability to take up dopamine in a benztropine- and nomifensine-sensitive manner. In the mesencephalic cultures, NT increased potassium-evoked release of tritiated dopamine, and the relative potencies of various NT-related peptides to increase dopamine release were in good agreement with their abilities to bind to NT sites. These results show for the first time that cultured rat mesencephalic dopaminergic cells express functional NT receptors. Finally, the specificity and distribution of NT receptors on dopaminergic neurons in primary culture are quite similar to what was observed in the adult rat brain using pharmacological and radioautographic approaches. These data indicate that NT can influence the activity of dopaminergic neurons at very early stages of the rat brain development.

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The Journal of Neuroscience: 12 (4)
Journal of Neuroscience
Vol. 12, Issue 4
1 Apr 1992
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Mesencephalic dopaminergic neurons in primary cultures express functional neurotensin receptors
A Brouard, D Pelaprat, C Dana, M Vial, AM Lhiaubet, W Rostene
Journal of Neuroscience 1 April 1992, 12 (4) 1409-1415; DOI: 10.1523/JNEUROSCI.12-04-01409.1992

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Mesencephalic dopaminergic neurons in primary cultures express functional neurotensin receptors
A Brouard, D Pelaprat, C Dana, M Vial, AM Lhiaubet, W Rostene
Journal of Neuroscience 1 April 1992, 12 (4) 1409-1415; DOI: 10.1523/JNEUROSCI.12-04-01409.1992
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