The protective effect of 2-chloroadenosine against the development of amygdala kindling and on amygdala-kindled seizures

被引:25
作者
AbdulGhani, AS
Attwell, PJE
Bradford, HF
机构
[1] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT BIOCHEM, LONDON SW7 2AZ, ENGLAND
[2] BIRZEIT UNIV, DEPT BIOL & BIOCHEM, BIRZEIT, ISRAEL
基金
英国惠康基金;
关键词
2-chloroadenosine; electrical kindling; seizure; epileptogenesis; amygdala; adenosine A(1) receptor; pre-synaptic;
D O I
10.1016/S0014-2999(97)00139-8
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
The influence of 2-chloroadenosine, a non-metabolizable adenosine A(1) receptor agonist, was tested on the development of electrically kindled amygdala and on the seizure responses of fully kindled rats. Focal intra-amygdaloid injection of 2-chloroadenosine (1-10 nmol/0.5 mu l) 20 min before applying the daily kindling stimulus prevented the development of the kindling process. The behavioural seizure score and the afterdischarge duration were reduced below their initial values. The antiepileptogenic effects of 1 and 10 nmol of 2-chloroadenosine were reversible 8-10 days after withdrawal of the drug. When 2-chloroadenosine was tested on fully developed stage 5 amygdala-kindled seizures, it increased the generalised seizure threshold in a dose-dependent manner. A maximum efficiency of 125% (P <0.001) was achieved with 5 nmol and the median effective dose was 0.55 nmol. Higher doses resulted in the reduced anticonvulsant effect (P <0.05). With the same daily stimulation, 2-chloroadenosine 5 nmol in 0.5 mu l vehicle, significantly reduced the maximum seizure score by 90%, the afterdischarge duration by 88% and completely blocked the generalised seizure duration. The antiseizure activity of the drug lasted for 3 days. In conclusion, 2-chloroadenosine not only acts as an anticonvulsant against electrically induced kindled seizures as described here, and against audiogenic seizures, electroshock and a variety of chemical convulsants as described by others, it prevents the development of the epileptic state by kindling-stimulation, i.e., it is antiepileptogenic. We theorise here that this is due to its blockade of presynaptic glutamate release.
引用
收藏
页码:7 / 14
页数:8
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