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. 1991 Aug;103(4):2030–2036. doi: 10.1111/j.1476-5381.1991.tb12371.x

The neuroprotective action of dizocilpine (MK-801) in the rat middle cerebral artery occlusion model of focal ischaemia.

R Gill 1, C Brazell 1, G N Woodruff 1, J A Kemp 1
PMCID: PMC1908204  PMID: 1912992

Abstract

1. An acute model of focal ischaemia, which involves permanent occlusion of the middle cerebral artery of the rat with 4 h survival, was used to find the minimum effective plasma concentration of dizocilpine (MK-801) and to determine its dose-effect relationship. 2. MK-801 was administered at the time of occlusion and was given as an i.v. bolus followed by an infusion for 4 h to maintain a steady state plasma concentration of the drug throughout the study. MK-801 was given at 3 dose levels; 0.04 mg kg-1 i.v. bolus + 0.6 micrograms kg-1 min-1 infusion; 0.12 mg kg-1 i.v. bolus + 1.8 micrograms kg-1 min-1 infusion; 0.4 mg kg-1 i.v. bolus + 6 micrograms kg-1 min-1 infusion, which gave mean plasma levels over the 4 h of 8.0 ng ml-1, 18.9 ng ml-1 and 113.2 ng ml-1 respectively. 3. MK-801 at 8.0 ng ml-1 gave 10% reduction in the volume of ischaemic brain damage in the cerebral cortex which just reached significance. The middle dose of MK-801 (18.9 ng ml-1) gave a highly significant reduction in the volume of ischaemic brain damage in the cerebral cortex and hemisphere, volumes of ischaemic tissue being reduced by 60% and 50% compared to saline-treated animals, respectively. The highest plasma concentration of MK-801 (113.2 ng ml-1) resulted in a 35% reduction in the volume of hemispheric damage and a 40% reduction in the volume of cortical damage, which were significant.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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