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Nitric oxide: an endogenous anticonvulsant substance

A Buisson¹, N Lakhmeche, C Verrecchia

¹Laboratoire de Pharmacologie, Faculté des Sciences Pharmaceutiques et Biologiques, Université René Descartes, Paris, France.

|April 1, 1993

Summary

The L-arginine-nitric oxide (NO) pathway terminates seizure activity. Inhibiting this pathway prolonged seizures, but L-arginine or cGMP administration reversed the effect, suggesting NO/cGMP

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Area of Science:

Neuroscience
Biochemistry
Pharmacology

Background:

Seizure activity involves complex neurological pathways.
The L-arginine-nitric oxide (NO) pathway plays a role in various physiological processes.
Understanding mechanisms of seizure termination is crucial for developing therapeutic strategies.

Purpose of the Study:

To investigate the role of the L-arginine-nitric oxide pathway in terminating seizure activity.
To elucidate the signaling cascade involving NO and cyclic guanosine monophosphate (cGMP) in seizure cessation.

Main Methods:

Seizures were induced in conscious mice via intracerebroventricular administration of N-methyl-D-aspartate (NMDA).
The NO-pathway was inhibited, and guanylate cyclase activity was blocked using methylene blue.

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Effects on seizure duration were assessed, and interventions with L-arginine and cGMP were evaluated.

Main Results:

Inhibition of the NO-pathway significantly increased seizure duration.
Administration of methylene blue also prolonged seizure activity.
Co-administration of L-arginine or direct injection of cGMP reversed the prolonged seizure duration.

Conclusions:

The L-arginine-nitric oxide pathway is critically involved in the termination of seizure activity.
NMDA receptor activation leads to nitric oxide production, increasing cGMP levels.
Elevated cGMP levels appear to induce the cessation of seizures, highlighting a potential therapeutic target.