Nimodipine prevents scopolamine-induced impairments in object recognition.
The effects of acute administration of the dihydropyridine calcium channel antagonist, nimodipine, were studied on the actions of scopolamine in the object recognition test. Scopolamine at 0.125 mg/kg decreased the difference in the time spent exploring novel and familiar objects when given either 15 min before, or immediately after, exposure to objects. Administration of nimodipine at 10 mg/kg, or 1 mg/kg, at the same time as the scopolamine completely prevented the deleterious effects on memory in this task. This effect was seen when nimodipine and/or scopolamine were given prior to the object exposure and also when the drugs were given after the experience of seeing the objects. Nimodipine had no effects on performance when given in the absence of scopolamine. This lack of change in total time spent exploring the objects indicated that the effects of scopolamine and nimodipine were not due to changes in motor coordination or alertness. The results are discussed in the light of the role of cholinergic transmission in memory and the known actions of dihydropyridines on brain function.
Norman
G
G
Psychology Department, University of Durham, UK.
Brooks
S P
SP
Hennebry
G M
GM
Eacott
M J
MJ
Little
H J
HJ
D000818:Animals; D002121:Calcium Channel Blockers / Q000494:pharmacology*; D003072:Cognition Disorders / Q000139:chemically induced* / Q000523:psychology*; D004305:Dose-Response Relationship, Drug; D005106:Exploratory Behavior / Q000187:drug effects; D005556:Form Perception / Q000187:drug effects*; D007274:Injections, Intraperitoneal; D007858:Learning / Q000187:drug effects; D008297:Male; D008568:Memory / Q000187:drug effects; D009043:Motor Activity / Q000187:drug effects; D018727:Muscarinic Antagonists / Q000494:pharmacology*; D009553:Nimodipine / Q000494:pharmacology*; D051381:Rats; D012601:Scopolamine / Q000037:antagonists & inhibitors* / Q000494:pharmacology
D002121:Calcium Channel Blockers; D018727:Muscarinic Antagonists; D009553:Nimodipine; D012601:Scopolamine