Attenuation of cerebral glucose use in kainic acid-treated rats by diazepam.
Diazepam's impact on kainic acid seizure-induced local cerebral glucose utilization (LCGU) was assessed by a quantitative [14C]2-deoxyglucose method. Male rats were injected i.p. with either kainic acid (12 mg/kg) or its vehicle, 3 or 48 h before LCGU determination. Diazepam (3.2 mg/kg) or its vehicle were injected i.m. 15 min before, 1 and 2.5 h after kainic acid. Diazepam blocked kainic acid-induced overt convulsions, attenuated LCGU increases at 3 h and prevented 48 h LCGU decreases in piriform cortex and amygdala. LCGU in (% of vehicle): CA3 (438%), CA4 (537%) and CA1-ventral (340%) of hippocampus, interpeduncular nucleus (200%) and lateral lemniscus (213%) were still significantly above vehicle levels in the 3 h diazepam-kainic acid group. These results suggest that diazepam suppresses the spread of kainic acid-induced seizure activity from the proposed CA3 epileptogenic focus. In addition, diazepam reduces, but does not abolish, hypermetabolic activity at the foci itself.
Chastain
J E
JE
Department of Pharmacology, Toxicology and Therapeutics, University of Kansas Medical Center, College of Health Sciences, Kansas City 66103.
Samson
F
F
Nelson
S R
SR
Pazdernik
T L
TL
D000818:Animals; D001345:Autoradiography; D001522:Behavior, Animal / Q000187:drug effects; D001921:Brain / Q000187:drug effects / Q000378:metabolism*; D003975:Diazepam / Q000494:pharmacology*; D005947:Glucose / Q000378:metabolism*; D007608:Kainic Acid / Q000037:antagonists & inhibitors*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D012640:Seizures / Q000139:chemically induced / Q000378:metabolism
D005947:Glucose; D003975:Diazepam; D007608:Kainic Acid