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Br J Pharmacol. 2000 May;130(1):23-6.

In vivo effects of the 5-HT(6) antagonist SB-271046 on striatal and frontal cortex extracellular concentrations of noradrenaline, dopamine, 5-HT, glutamate and aspartate.

Author information

  • 1Neuroscience Discovery Research, Wyeth, CN8000, Princeton, New Jersey, NJ 08543, USA. Dawsonl@war.wyeth.com

Abstract

Although the 5-HT(6) receptor subtype was identified some 5 years ago, very little is known about its function within the brain. Here we demonstrate, for the first time, the neurochemical effects of a selective 5-HT(6) receptor ligand. Using in vivo microdialysis in the freely moving rat, we evaluated the effects of the selective 5-HT(6) receptor antagonist SB-271046 by simultaneous measurement of 5-hydroxytryptamine (5-HT), dopamine (DA), noradrenaline (NA), glutamate and aspartate from the striatum and frontal cortex. SB-271046 did not alter basal levels of 5-HT, DA and NA in either brain region. Similarly, there was no change basal levels of either of the excitatory amino acids within the striatum. In contrast, administration of SB-271046 (10 mg kg(-1) s.c.) produced a significant (P<0.05), tetrodotoxin-dependent, increase in extracellular levels of both glutamate and aspartate within the frontal cortex, reaching maximum values of 375.4+/-82.3 and 215. 3+/-62.1% of preinjection values, respectively.

PMID:
10780993
[PubMed - indexed for MEDLINE]
PMCID:
PMC1572041
Free PMC Article
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