Uridine release during aminopyridine-induced epilepsy.

Abstract:

:Uridine, like adenosine, is released under sustained depolarization and it can inhibit hippocampal neuronal activity, suggesting that uridine may be released during seizures and can be involved in epileptic mechanisms. In an in vivo microdialysis study, we measured the extracellular changes of nucleoside and amino acid levels and recorded cortical EEG during 3-aminopyridine-induced epilepsy. Applying silver impregnation and immunohistochemistry, we examined the degree of hippocampal cell loss. We found that extracellular concentration of uridine, adenosine, inosine, and glutamate increased significantly, while glutamine level decreased during seizures. The release of uridine correlated with seizure activity. Systemic and local uridine application was ineffective. The number of parvalbumin- and calretinin-containing interneurons of dorsal hippocampi decreased. We conclude that uridine is released during epileptic activity, and suggest that as a neuromodulator, uridine may contribute to epilepsy-related neuronal activity changes, but uridine analogues having slower turnover would be needed for further investigation of physiological role of uridine.

journal_name

Neurobiol Dis

journal_title

Neurobiology of disease

authors

Slézia A,Kékesi AK,Szikra T,Papp AM,Nagy K,Szente M,Maglóczky Z,Freund TF,Juhász G

doi

10.1016/j.nbd.2004.02.011

keywords:

subject

Has Abstract

pub_date

2004-08-01 00:00:00

pages

490-9

issue

3

eissn

0969-9961

issn

1095-953X

pii

S0969996104000452

journal_volume

16

pub_type

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