Evidence that L-arginine possesses proconvulsant effects mediated through nitric oxide.

Abstract:

:Increasing evidence suggests a neurotransmitter role for NO in the mammalian CNS. We have now studied the behavioural and electrocortical (ECoG) profile of rats injected into the lateral cerebral ventricle (ICV) with L-arginine (L-arg), the endogenous donor of the guanidino group from which NO physiologically originates. Rats treated with L-arg (up to 300 micrograms) showed behavioural stimulation, ECoG desynchronization with occasional isolated high voltage spikes but not motor seizures. In rats receiving a subconvulsive dose (0.5 microgram) of N-methyl-D-aspartic acid, (NMDA; ICV) the microinjection of L-arg (300 micrograms; 1 min before) resulted in behavioural and ECoG seizures. The latter effects were prevented by co-administrating L-arg with N-nitro-L-arginine (L-NAME), an inhibitor of NO synthesis. In conclusion, L-arg possesses proconvulsant effects probably mediated by an increase in NO synthesis.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Mollace V,Bagetta G,Nisticò G

doi

10.1097/00001756-199105000-00014

subject

Has Abstract

pub_date

1991-05-01 00:00:00

pages

269-72

issue

5

eissn

0959-4965

issn

1473-558X

journal_volume

2

pub_type

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