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Related Experiment Videos

Species differences in 5-HT autoreceptors

G W Price1, C Roberts, J Watson

  • 1Department of Psychiatry Research, SmithKline Beecham Pharmaceuticals, Essex, UK.

Behavioural Brain Research
|January 1, 1996
PubMed
Summary

The study identifies the 5-HT1D receptor as the terminal autoreceptor in guinea pig brains using the novel antagonist GR 127935. This clarifies serotonin (5-HT) release regulation and receptor classification.

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Area of Science:

  • Neuroscience
  • Pharmacology

Background:

  • Serotonin (5-HT) release in the central nervous system (CNS) is regulated by autoreceptors, categorized as cell body and terminal autoreceptors.
  • Cell body autoreceptors (5-HT1A) inhibit 5-HT release by reducing cell firing, while terminal autoreceptors directly inhibit release at the nerve terminal.
  • The classification of terminal autoreceptors has been challenging due to the lack of selective antagonists, particularly for the 5-HT1D subtype.

Purpose of the Study:

  • To investigate the subtype of the terminal autoreceptor in guinea pig cerebral cortex.
  • To characterize the pharmacological profile of the novel 5-HT1D receptor antagonist, GR 127935.
  • To elucidate the role of 5-HT1D receptors in regulating 5-HT release.

Main Methods:

  • In vitro [3H]5-HT release studies were conducted to assess the effect of GR 127935 on 5-HT-induced inhibition of [3H]5-HT release.

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  • In vivo microdialysis was employed to measure extracellular 5-HT levels in guinea pig cerebral cortex following administration of GR 127935 and methiothepin.
  • Both local (intracerebral) and systemic administration routes were utilized for antagonist delivery.

    • Main Results:

    • GR 127935 significantly attenuated the inhibitory effect of 5-HT on [3H]5-HT release in vitro, consistent with blockade of terminal autoreceptors.
    • Microdialysis revealed that local administration of GR 127935 and methiothepin potentiated extracellular 5-HT levels, supporting terminal autoreceptor blockade.
    • Systemic administration of both antagonists led to a decrease in extracellular 5-HT levels, suggesting potential partial agonism or activation of 5-HT1A autoreceptors.

    Conclusions:

    • The findings provide strong evidence that the terminal autoreceptor in the guinea pig cerebral cortex is of the 5-HT1D subtype.
    • The novel antagonist GR 127935 is a valuable tool for studying 5-HT1D receptor function.
    • The study highlights the complex regulation of serotonin release and the differential effects of autoreceptor antagonists depending on administration route.