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Comparison of Serotonin and Dopamine Release in Substantia Nigra and Ventral Tegmental Area: Region and Species Differences

: In this study, we compare the electrically evoked, somatodendritic release of dopamine (DA) with axonal release of serotonin (5‐HT) in the substantia nigra (SN) and ventral tegmental area (VTA) in vitro by using fast‐scan cyclic voltammetry with carbon‐fibre microelectrodes. Furthermore, we have e...

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Published in:Journal of neurochemistry 1997-12, Vol.69 (6), p.2378-2386
Main Authors: Cragg, S. J., Hawkey, C. R., Greenfield, S. A.
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Hawkey, C. R.
Greenfield, S. A.
description : In this study, we compare the electrically evoked, somatodendritic release of dopamine (DA) with axonal release of serotonin (5‐HT) in the substantia nigra (SN) and ventral tegmental area (VTA) in vitro by using fast‐scan cyclic voltammetry with carbon‐fibre microelectrodes. Furthermore, we have examined transmitter release in these regions in guinea‐pig compared with rat. Somatodendritic DA was released, as shown previously, in guinea‐pig VTA, SN pars compacta (SNc), and occasionally in SN pars reticulata (SNr). 5‐HT was rarely released, except in SNr, where nonetheless it only contributed to
doi_str_mv 10.1046/j.1471-4159.1997.69062378.x
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J. ; Hawkey, C. R. ; Greenfield, S. A.</creator><creatorcontrib>Cragg, S. J. ; Hawkey, C. R. ; Greenfield, S. A.</creatorcontrib><description>: In this study, we compare the electrically evoked, somatodendritic release of dopamine (DA) with axonal release of serotonin (5‐HT) in the substantia nigra (SN) and ventral tegmental area (VTA) in vitro by using fast‐scan cyclic voltammetry with carbon‐fibre microelectrodes. Furthermore, we have examined transmitter release in these regions in guinea‐pig compared with rat. Somatodendritic DA was released, as shown previously, in guinea‐pig VTA, SN pars compacta (SNc), and occasionally in SN pars reticulata (SNr). 5‐HT was rarely released, except in SNr, where nonetheless it only contributed to &lt;30% of amine signals. In rat midbrain, somatodendritic DA release was evoked to a similar extent as in guinea‐pig. However, a clear species difference was apparent; i.e., 5‐HT and DA were detected equally in rat SNc, whereas in rat SNr, 5‐HT was the predominant transmitter detected. Nevertheless, electrically evoked extracellular concentrations of 5‐HT in SNc and SNr were, respectively, seven‐ and fourfold less than DA in SNc. 5‐HT release was low in all regions in neonatal rat slices before the maturation of 5‐HT terminals. Hence, axonal 5‐HT transmission in midbrain exhibits both species and site selectivity. 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J.</creatorcontrib><creatorcontrib>Hawkey, C. R.</creatorcontrib><creatorcontrib>Greenfield, S. A.</creatorcontrib><title>Comparison of Serotonin and Dopamine Release in Substantia Nigra and Ventral Tegmental Area: Region and Species Differences</title><title>Journal of neurochemistry</title><addtitle>J Neurochem</addtitle><description>: In this study, we compare the electrically evoked, somatodendritic release of dopamine (DA) with axonal release of serotonin (5‐HT) in the substantia nigra (SN) and ventral tegmental area (VTA) in vitro by using fast‐scan cyclic voltammetry with carbon‐fibre microelectrodes. Furthermore, we have examined transmitter release in these regions in guinea‐pig compared with rat. Somatodendritic DA was released, as shown previously, in guinea‐pig VTA, SN pars compacta (SNc), and occasionally in SN pars reticulata (SNr). 5‐HT was rarely released, except in SNr, where nonetheless it only contributed to &lt;30% of amine signals. 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subjects Animals
Animals, Newborn - metabolism
Biological and medical sciences
Central nervous system
Central neurotransmission. Neuromudulation. Pathways and receptors
Dopamine
Dopamine - metabolism
Electric Stimulation
Fundamental and applied biological sciences. Psychology
Guinea Pigs
Male
Mesencephalon - metabolism
Rats
Rats, Wistar
Serotonin
Serotonin - metabolism
Somatodendritic release
Species difference
Species Specificity
Substantia nigra
Substantia Nigra - metabolism
Tegmentum Mesencephali - metabolism
Tissue Distribution
Ventral tegmental area
Vertebrates: nervous system and sense organs
Voltammetry
title Comparison of Serotonin and Dopamine Release in Substantia Nigra and Ventral Tegmental Area: Region and Species Differences
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