Effects of acute and chronic administration of the serotonin1A agonist buspirone on serotonin synthesis in the rat brain.

Abstract:

:The effects of acute and chronic administration of buspirone, a serotonin 5-HT1A agonist, on the 5-HT synthesis rates in various rat brain structures were investigated using alpha-[14C]methyl-L-tryptophan (alpha-[14C]MTrp) and an autoradiographic method. In the acute treatment study, buspirone (10 mg/kg) was injected subcutaneously 30 min before alpha-[14C]MTrp administration (30 microCi over 2 min) into a femoral vein. In the chronic treatment study, buspirone was given in a sustained fashion (10 mg/kg/day) for 14 days using an osmotic minipump implanted subcutaneously. Rats were killed 60 and 150 min after alpha-[14C]MTrp administration (two-time point method). A single dose of buspirone induced a significant decrease of 5-HT synthesis throughout the brain with the exception of the pineal body. However, the chronic treatment with buspirone did not induce significant differences in 5-HT synthesis in the brain. There was no significant difference in plasma free tryptophan concentration between any of the groups. The unaltered 5-HT synthesis rates in the chronic treatment study likely reflect a normalization of this parameter due to a desensitization of 5-HT1A autoreceptors on the cell body of 5-HT neurons, which has been previously shown to occur following long-term treatment with 5-HT1A agonists.

journal_name

J Neurochem

authors

Okazawa H,Yamane F,Blier P,Diksic M

doi

10.1046/j.1471-4159.1999.0722022.x

keywords:

subject

Has Abstract

pub_date

1999-05-01 00:00:00

pages

2022-31

issue

5

eissn

0022-3042

issn

1471-4159

journal_volume

72

pub_type

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