ANTICONVULSANT BINDING SITES

抗惊厥药结合位点

• 批准号: 3408000
• 负责人: JOSE M MUSACCHIO
• 金额: $ 12.55万
• 依托单位: NEW YORK UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-02-15 至 1991-01-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3408000
• 关键词: anticonvulsants; autoradiography; brain disorder chemotherapy; chemical binding; combination chemotherapy; drug screening /evaluation; electrostimulus; epilepsy; guinea pigs; laboratory rat; phenytoin

Studies on the binding of (3H)dextromethorphan demonstrated that phenytoin (diphenylhydantoin, PHT) has a modulatory effect on the dextromethorphan binding sites and suggested that dextromethorphan could have anticonvulsant activity and enhance the pharmacologic activity of PHT. Pretreatment with dextromethorphan results in a dose-related blockage of the maximal electroshock seizure tonic hindlimb extension in the rat supramaximal electroshock test. Moreover, the simultaneous administration of subthreshold dose of dextromethorphan lowers the anticonvulsant ED50 of phenytoin three fold. It is possible that dextromethorphan used alone, or in combination with PHT, may prove to be a novel therapeutic agent for the treatment of epilepsy. We will search for other potential anticonvulsant drugs that bind to the dextromethorphan binding sites. We have recently found that carbetapentane and caramiphen, drugs that bind to the dextromethorphan sites are also anticonvulsant. We will further characterize the relationships between phenytoin and dextromethorphan binding sites by investigating the effects of known anticonvulsant agents, other drugs and toxins on the binding of tritiated dextromethorphan. To better understand the physiological significance of the dextromethorphan binding sites, we will determine their autoradiographic localization in the brain and we will explore the existence of endogenous ligands for the dextromethorphan and phenytoin binding sites. The allosteric interactions of phenytoin and dextromethorphan at their binding sites and the potentiation of its anticonvulsant effects suggest the existence of a novel cooperative mechanism by which drugs acting at two different but interacting sites exert their effects. This mechanism has marked similarities with the allosteric interactions between GABA and benzodiazepines, even though their binding sites are completely different. It is clear that the investigation of the molecular mechanism of the effects observed will help to open new approaches for the understanding of epilepsy and for the development of new, more effective and less toxic anticonvulsants.

对 (3H) 右美沙芬结合的研究表明 苯妥英（二苯妥英，PHT）对 右美沙芬结合位点并表明右美沙芬 可能具有抗惊厥活性并增强药理作用 PHT 的活性。 右美沙芬预处理可产生 剂量相关的最大电击癫痫发作强直阻断 大鼠超最大电击试验中的后肢伸展。 此外，同时给予阈下剂量的 右美沙芬降低苯妥英三的抗惊厥ED50 折叠。 右美沙芬可以单独使用，也可以与其他药物一起使用。 与 PHT 组合，可能被证明是一种新型治疗剂 癫痫的治疗。 我们将寻找其他可能结合的抗惊厥药物 至右美沙芬结合位点。 我们最近发现 卡倍戊烷和卡米芬，与 右美沙芬位点也具有抗惊厥作用。 我们将进一步 描述苯妥英和苯妥英之间的关系 通过研究右美沙芬结合位点的影响 已知的抗惊厥药物、其他药物和毒素的结合 氚化右美沙芬。 为了更好地理解 右美沙芬结合位点的生理意义， 我们将确定它们在大脑中的放射自显影定位 我们将探索内源性配体的存在 右美沙芬和苯妥英结合位点。 苯妥英钠和右美沙芬的变构相互作用 它们的结合位点及其抗惊厥药的效力 效果表明存在一种新颖的合作机制 哪些药物作用于两个不同但相互作用的位点发挥作用 他们的影响。 该机制与 GABA 和苯二氮卓类药物之间的变构相互作用，甚至 尽管它们的结合位点完全不同。 很明显 影响的分子机制的研究 观察到的现象将有助于开辟新的理解途径 癫痫并开发新的、更有效、更少的药物 有毒的抗惊厥药。