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Effects of pharmacological manipulation on neurotransmitter and other amino acid levels in the CSF of the Senegalese baboon Papio papio.

Abstract：

:The concentrations of GABA, glutamate, aspartate, glycine, taurine, glutamine, asparagine and alanine were determined in the CSF of 10 Senegalese baboons (Papio papio) following initial ketamine anaesthesia and subsequent administration (4 h later) of different compounds known to alter either inhibitory or excitatory neurotransmission. Ketamine itself was apparently without effect as the administration of a second dose of ketamine did not significantly alter the levels of any of the amino acids studied, although GABA levels tended to decrease. The presence of haemolysed material in occasional samples was associated with high GABA, glutamate, aspartate, taurine and asparagine levels. Therefore only haemolysate-free samples were included for analysis. Of the compounds administered, gamma-vinyl GABA had the most evident effect on CSF amino acid levels, increasing GABA (greater than 5-fold) and decreasing glutamate (greater than 50%), aspartate (40-50%), asparagine (20%) and alanine (30-35%) levels. The changes in GABA, glutamate and aspartate were still apparent 24 h post-gamma-vinyl GABA administration. In contrast, sodium valproate did not significantly alter the CSF levels of any of the amino acids studied. Upon acute administration allylglycine decreased the CSF concentrations of GABA and alanine, but not glutamate. These alterations are unlikely related to the occurrence of allylglycine-induced convulsions (in 2 of 4 experiments) as electroconvulsive shock did not alter CSF amino acid levels. During the experimental period encompassing the allylglycine injection (8 weeks), basal (initial post-ketamine, pre-drug sample) amino acid levels were abnormal with large increases in glutamate, GABA, aspartate and taurine whereas asparagine levels were below the limit of detection. Diazepam administration was followed by a significant increase in taurine and a decrease in aspartate levels.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Brain Res

journal_title

Brain research

authors

Valin A,Voltz C,Naquet R,Lloyd KG

doi

10.1016/0006-8993(91)90370-b

subject

Has Abstract

pub_date

1991-01-04 00:00:00

pages

15-23

issue

eissn

0006-8993

issn

1872-6240

pii

0006-8993(91)90370-B

journal_volume

538

pub_type

杂志文章

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Effects of pharmacological manipulation on neurotransmitter and other amino acid levels in the CSF of the Senegalese baboon Papio papio.