Summary
The release of 3H-DA was estimated in superfusates of a superfusion cannula introduced into the caudate of a superfusion cannula introduced into was continuously formed from l-3,5-3H-tyrosine introduced into the superfusion medium. Injected at the periphery, picrotoxin (2.5 mg/kg, i.p.) markedly enhanced the release of 3H-DA the effect being particularly pronounced 90 min after the drug injection. The effects of the local introduction of picrotoxin into the substantia nigra and into the caudate nucleus on 3H-DA release were also examined to ensure the specificity of the result. Picrotoxin (10−5 M) added into the superfusing medium of a second superfusion cannula introduced into the substantia nigra enhanced by 2 to 5 times the release of 3H-DA during the drug application. No effect could be seen when the tip of the superfusion cannula was not exactly localized into the substantia nigra. Although less pronounced, a stimulation of 3H-DA release was also seen when picrotoxin (10−6 M) was added directly into the superfusion medium of the cannula introduced into the caudate nucleus. These results suggest that some gabaergic neurons are involved in the control of DA release by acting on dopaminergic cell bodies or dendrites into the substantia nigra. Other gabaergic neurons may directly or indirectly act on dopaminergic terminals within the caudate nucleus.
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Cheramy, A., Nieoullon, A. & Glowinski, J. Effects of peripheral and local administration of picrotoxin on the release of newly synthesized 3H-dopamine in the caudate nucleus of the cat. Naunyn-Schmiedeberg's Arch. Pharmacol. 297, 31–37 (1977). https://doi.org/10.1007/BF00508807
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DOI: https://doi.org/10.1007/BF00508807