Release of endogenous 5-hydroxytryptamine in rat ventral hippocampus evoked by electrical stimulation of the dorsal raphe nucleus as detected by microdialysis: sensitivity to tetrodotoxin, calcium and calcium antagonists

Neuroscience
T SharpD G Grahame-Smith

Abstract

We have utilized the brain microdialysis technique in an attempt to measure excitation-secretion coupled release of endogenous 5-hydroxytryptamine in rat brain in vivo and investigated the pharmacology of the voltage-sensitive calcium channel involved in this process. All experiments were carried out using chloral hydrate anaesthetized rats. Ascending serotoninergic neurons were electrically stimulated using an electrode implanted into the dorsal raphe nucleus. A dialysis probe was implanted into the ventral hippocampus and continuously perfused with artificial cerebrospinal fluid containing the selective 5-hydroxytryptamine uptake inhibitor citalopram (1 microM). Twenty-minute perfusates were analysed for endogenous 5-hydroxytryptamine using high performance liquid chromatography with electrochemical detection. Electrical stimulation (cathodal monophasic 1 ms pulses, 300 microA, 2-10 Hz) of the dorsal raphe nucleus for 20 min induced an immediate release of 5-hydroxytryptamine which lasted for the duration of the stimulus and was frequency-dependent. The calculated amount of 5-hydroxytryptamine release per electrical impulse was constant over the frequency range used. Addition of tetrodotoxin (10 microM) to, or omission of cal...Continue Reading

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Citations

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Jan 18, 2011·Pharmacology, Biochemistry, and Behavior·América A ScopinhoLeonardo B M Resstel

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