Reduction of cerebral infarct size by non-competitive AMPA antagonists in rats subjected to permanent and transient focal ischemia.

Abstract

Antagonists of 2-amino-3(3-hydroxy-5-methyl-4-isoxazolyl) propionic acid (AMPA) receptors can considerably reduce brain damage after cerebral ischemia, but effectiveness of selective AMPA antagonists has been questioned recently. Therefore, we evaluated the antiischemic efficacy of [+/-]-7-acetyl-5-[4-aminophenyl]-7,8-dihydro-8-cyano-8-methyl-9H-1,3-dioxolo-[4,5-h]-2,3-benzodiazepine (EGIS-8332) and GYKI 53405, two selective, non-competitive AMPA antagonists in two rat models of focal cerebral ischemia. Permanent focal ischemia was produced by electrocoagulation of the middle cerebral artery (MCA). EGIS-8332 and GYKI 53405 were administered 30 min after MCA occlusion at doses of 1, 3 or 10 mg/kg i.p. In transient focal ischemia, MCA was occluded for 1 h and reperfused for 24 h using the intraluminal filament technique and the compounds were given at 3x10 mg/kg i.p. 60, 120 and 180 min following occlusion. In permanent focal ischemia, EGIS-8332 decreased the volume of cerebral infarction both at 10 mg/kg i.p. (36.4%, p<0.01) and at 3 mg/kg i.p. (26.4%, p<0.05) in a dose-dependent manner. GYKI 53405 produced a similar antiischemic effect at 10 mg/kg i.p. (36.4%, p<0.01), but it was ineffective at 3 mg/kg i.p. (6.5%, p=0.57). In transient focal ischemia, EGIS-8332 reduced the volume of necrotic brain tissue (38.7%, p<0.01) and GYKI 53405 was similarly effective (32.6%, p<0.05). Both compounds afforded neuroprotection in the cortical and subcortical regions of the MCA territory. Selective, non-competitive AMPA antagonists administered after the ischemic insult can produce effective neuroprotective action in experimental models of focal cerebral ischemia; therefore, these compounds may be useful as therapeutic agents for the treatment of stroke and neurodegenerative disorders.

• Authors: Eva Matucz, Krisztina Móricz, Gábor Gigler, Annamária Simó, József Barkóczy, György Lévay, László G Hársing Jr, Gábor Szénási
• Journal: Brain research (Brain Res) Vol. 1019 Issue 1-2 Pg. 210-6 (Sep 03 2004) ISSN: 0006-8993 [Print] Netherlands
• PMID: 15306255 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Excitatory Amino Acid Antagonists
• Receptors, AMPA

Topics

• Animals
• Brain Ischemia (drug therapy, metabolism)
• Cerebral Infarction (drug therapy, metabolism)
• Excitatory Amino Acid Antagonists (therapeutic use)
• Male
• Rats
• Rats, Sprague-Dawley
• Receptors, AMPA (antagonists & inhibitors, metabolism)