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Amino Acids

, Volume 15, Issue 1–2, pp 117–134 | Cite as

Locally infused taurine, GABA and homotaurine alter differently the striatal extracellular concentrations of dopamine and its metabolites in rats

  • M. Ruotsalainen
  • M. Majasaari
  • J. Salimäki
  • L. Ahtee
Full Papers

Summary

We studiedin vivo the effects of locally infused taurine (50, 150, and 450 mM) on the striatal dopamine and its metabolites in comparison with those of GABA and homotaurine, a GABAA receptor agonist, in freely moving rats. The extracellular dopamine concentration was elevated maximally 2.5-, 2- and 4-fold by taurine, GABA and homotaurine, respectively. At 150 mM concentration, at which the maximum effects occurred, homotaurine increased the extracellular dopamine more than taurine or GABA. When taurine and GABA were infused simultaneously with tetrodotoxin the output of dopamine did not differ from that in the presence of tetrodotoxin alone. In comparison, tetrodotoxin did not inhibit the increase in extracellular dopamine caused by homotaurine. Furthermore, omission of calcium from the perfusion fluid inhibited the increase of extracellular dopamine caused by GABA. However, it did not block the increase of dopamine caused by taurine or homotaurine. The present study suggests that the effects of intrastriatal taurine, GABA and homotaurine on the striatal extracellular dopamine differ. Thus, these amino acids seem to affect the striatal dopaminergic neurons via more than one mechanism.

Keywords

Amino acids Striatal dopamine release Intrastriatal taurine GABA Homotaurine Microdialysis Rat 

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Copyright information

© Springer-Verlag 1998

Authors and Affiliations

  • M. Ruotsalainen
    • 1
  • M. Majasaari
    • 1
  • J. Salimäki
    • 1
  • L. Ahtee
    • 1
  1. 1.Division of Pharmacology and ToxicologyDepartment of Pharmacy, University of HelsinkiHelsinkiFinland

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