Effects of a psychostimulant drug sydnocarb on rat brain dopaminergic transmission in vivo.


Journal Article

Transcerebral microdialysis was used to evaluate the effect of a psychostimulant drug, sydnocarb (3-(beta-phenylisopropyl)-N-phenylcarbamoylsydnonimine), on the extracellular levels of dopamine, 3,4-dihydroxyphenylacetic acid (DOPAC) and homovanillic acid (HVA) in the dorsal striatum and nucleus accumbens of freely moving rats. Sydnocarb dose dependently (4.4, 8.75 and 17.5 mg/kg, i.p.) induced a relatively modest (up to 350% of control) and long-lasting (up to 6 h) increase in dopamine extracellular level in the rat dorsal striatum. The drug at 8.75 mg/kg, i.p., produced an approximately similar increase in dopamine efflux in the dorsal striatum and in the nucleus accumbens of freely moving rats. Sydnocarb had no effect on DOPAC or HVA extracellular levels in the rat basal ganglia in vivo at any dose studied. It is important that the drug increased the efflux of dopamine in a tetrodotoxin-sensitive and Ca2+-dependent manner. Measurements of behavioral parameters in non-operated rats revealed that sydnocarb markedly increased locomotor activity and induced stereotyped behavior. These data suggest that the stimulant action of sydnocarb is accompanied by a facilitation of central dopaminergic transmission involving an increase in Ca2+-dependent vesicular dopamine efflux.

Full Text

Duke Authors

Cited Authors

  • Gainetdinov, RR; Sotnikova, TD; Grekhova, TV; Rayevsky, KS

Published Date

  • December 4, 1997

Published In

Volume / Issue

  • 340 / 1

Start / End Page

  • 53 - 58

PubMed ID

  • 9527506

Pubmed Central ID

  • 9527506

International Standard Serial Number (ISSN)

  • 0014-2999

Digital Object Identifier (DOI)

  • 10.1016/s0014-2999(97)01407-6


  • eng

Conference Location

  • Netherlands