Effects of post-training administration of (-)-baclofen and chlordiazepoxide on memory retention in ICRC Swiss mice: interactions with GABAA and GABAB receptor antagonists.
The effects of post-training administration of chlordiazepoxide and (-)-baclofen on memory retention was studied in ICRC Swiss mice by measuring the retest stepdown latency 24 hr after foot-shock in a passive avoidance task. Chlordiazepoxide 20 mg/kg impaired memory retention and a similar effect was produced by 10 mg/kg of diazepam. The effect of chlordiazepoxide was antagonised when combined with picrotoxin but not by the addition of a specific GABAB antagonist CGP 35348. The effect of chlordiazepoxide on memory retention seems to be mediated by action at the GABAA-benzodiazepine receptor complex. (-) Baclofen, the active isomer of the GABAB agonist enhanced memory in ICRC mice and this effect was antagonised by CGP 35348 at a dose of 10 mg/kg. The inactive isomer of baclofen, (+)-baclofen did not produce any effect. This indicates that GABAB receptors contribute to the effects of (-)-baclofen on memory.
Department of Pharmacology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
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N
Saha
Y
Y
Chugh
A
A
Sankaranaryanan
P L
PL
Sharma
D000818:Animals; D001418:Baclofen / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D002707:Chlordiazepoxide / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D058787:GABA-A Receptor Antagonists; D007536:Isomerism; D008297:Male; D008568:Memory / Q000187:drug effects*; D051379:Mice; D008813:Mice, Inbred ICR; D009043:Motor Activity / Q000187:drug effects; D009943:Organophosphorus Compounds / Q000494:pharmacology; D010852:Picrotoxin / Q000494:pharmacology; D011963:Receptors, GABA-A / Q000378:metabolism*; D005680:gamma-Aminobutyric Acid / Q000378:metabolism*
D001418:Baclofen; D002707:Chlordiazepoxide; D058787:GABA-A Receptor Antagonists; D009943:Organophosphorus Compounds; D010852:Picrotoxin; D011963:Receptors, GABA-A; D005680:gamma-Aminobutyric Acid; C066430:CGP 35348