Anticonvulsant and glutamate release-inhibiting properties of the highly potent metabotropic glutamate receptor agonist (2S,2′R,3′R)-2-(2′,3′-dicarboxycyclopropyl) glycine (DCG-IV)

被引:51
作者
Attwell, PJE
Kent, NS
Jane, DE
Croucher, MJ
Bradford, HF
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Biochem, London SW7 2AZ, England
[2] Charing Cross Hosp, Sch Med, Imperial Coll, Div Neurosci & Psychol Med,Dept Neurodegenerat, London W6 8RF, England
[3] Sch Med Sci Bristol, Dept Pharmacol, Bristol BS8 1TD, Avon, England
关键词
presynaptic glutamate receptor; group II metabotropic glutamate receptor; glutamate release; kindling; epileptogenesis; seizure; DCG-IV; lamotrigine;
D O I
10.1016/S0006-8993(98)00698-2
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The anticonvulsant effects of intracerebral administration of the highly potent group II metabotropic glutamate receptor agonist, DCG-IV, were tested in fully kindled rats following daily electrical stimulation of the basolateral amygdala. The agonist caused a dose-dependent increase in the generalized seizure threshold (GST) of these seizure susceptible animals within the dose range tested (0.01-1.0 nmol). The estimated GST(100) value (dose causing a 100% increase in GST) for this effect was 0.22 nmol. The anti-seizure activity of DCG-IV was fully inhibited in the presence of the group II metabotropic glutamate receptor antagonist (2S,1'S,2'S)-2-methyl-2(carboxycyclopropyl)glycine (MCCG; 40 nmol), while MCCG alone showed no significant inhibitory effect on seizure activity. DCG-IV also powerfully inhibited depolarization-induced release of [H-3]D-aspartate from rat cerebrocortical synaptosomes, with an IC50 value of 0.39 mu M In this respect, DCG-IV was approximately 70-fold more potent than the clinically effective anticonvulsant drug lamotrigine (IC50 = 27.7 mu M), a proposed neurotransmitter release inhibitor known to inhibit glutamate release, also tested in this assay. These findings demonstrate the high potency of DCG-IV as an anticonvulsant agent and confirm a key role for group II metabotropic glutamate receptors in the control of seizure activity via their modulatory action on neuronal glutamate release. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:138 / 143
页数:6
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