Intrathalamic injections of gamma-hydroxybutyric acid increase genetic absence seizures in rats.
The effects of intrathalamic injections of gamma-hydroxybutyric acid (GHB) and of NCS 382 85, a specific antagonist of GHB receptors, were evaluated in rats with spontaneous generalized absence epilepsy. Bilateral injections of GHB (25 and 50 micrograms/side) into the mediolateral thalamus increased spontaneous spike and wave discharges (SWD) in a dose-dependent fashion. This effect was suppressed by administration of NCS 382 85 (50 micrograms/side). Bilateral injection of NCS 382 85 alone (50 and 100 micrograms/side) into the same sites had no effect on SWD duration. Injection of GHB or NCS 382 85 into the midline thalamus and the area of reticular nuclei did not modify the SWD. These data suggest that GHB receptors in the mediolateral thalamus may be involved in the control of spontaneous SWD in this rat model of petit mal epilepsy.
Liu
Z
Z
Département de Neurophysiologie et Biologie des Comportements, Centre de Neurochimie du CNRS, Strasbourg, France.
Snead
O C
OC
Vergnes
M
M
Depaulis
A
A
Marescaux
C
C
D000818:Animals; D001567:Benzocycloheptenes / Q000494:pharmacology; D004827:Epilepsy / Q000235:genetics / Q000503:physiopathology*; D008297:Male; D008845:Microinjections; D009928:Organ Specificity; D051381:Rats; D011919:Rats, Inbred Strains; D011922:Rats, Mutant Strains; D012978:Sodium Oxybate / Q000008:administration & dosage / Q000494:pharmacology*; D013238:Stereotaxic Techniques; D013788:Thalamus / Q000187:drug effects / Q000502:physiology / Q000503:physiopathology*; D013997:Time Factors
D001567:Benzocycloheptenes; C066471:NCS 382; D012978:Sodium Oxybate