Lack of Circadian Variation in the Sensitivity of Rat Terminal 5-HT1B Autoreceptors

Author:

Singh Ashish1,Redfern Peter1

Affiliation:

1. Pharmacology Group, School of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath, Avon BA2 7AY, UK

Abstract

Abstract The sensitivity of terminal 5-HT1B autoreceptors in the cerebral cortex and hippocampus to both agonist and antagonist was determined at four different time points in the light: dark cycle of the rat to evaluate whether changes in their responsiveness underlie the circadian rhythm in 5-hydroxytryptamine (5-HT) release. No significant circadian differences were evident in the apparent pIC50 values calculated for 5-HT to inhibit K+-evoked tritium effiux or in the apparent pA2 values calculated for methiothepin to antagonize the effect of 5-HT, at the different time points, in either brain region. These findings suggest that the sensitivity of terminal 5-HT1B autoreceptors in rat cerebral cortex and hippocampus does not change in a circadian pattern, during the light: dark cycle, and argues against such a change influencing the circadian variation in 5-HT release.

Publisher

Oxford University Press (OUP)

Subject

Pharmaceutical Science,Pharmacology

Reference27 articles.

1. Diurnal variation in the function of serotonin terminals in the rat hypothalamus;Blier;J. Neurochem.,1989

2. Rhythmic changes in rat hypothalamic 3H-imipramine binding and 5-HT uptake sites: possible biochemical correlate with antidepressant action;Brunello;Soc. Neurosci. Abstr.,1987

3. Circadian variations in the activity of tyrosine hydroxylase, tyrosine aminotransferase, and tryptophan hydroxylase: relationship to catecholamine metabolism;Cahill;J. Neurochem.,1981

4. The effect of phase-shift on the passive avoidance response in rats and the modifying action of chlordiazepoxide;Davies;Br. J. Pharmacol.,1974

5. Identity of inhibitory presynaptic 5-hydroxytryptamine (5-HT) autoreceptors in the rat brain cortex with 5-HT1B binding sites;Engel;Naunyn Schmiedebergs Arch. Pharmacol.,1986

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