大鼠纹状体I组代谢型谷氨酸受体激动引起动物向对侧旋转  

Activation of group I metabotropic glutamate receptors in rat striatum induces contralateral rotation

作　　者：袁芳[1] 王忠诚[1] 徐立新 王天佑 张亚卓 

机构地区：[1]北京市神经外科研究所病理生理室

出　　处：《中国病理生理杂志》2001年第5期418-421,共4页Chinese Journal of Pathophysiology

基　　金：北京市科技新星计划资助!项目 (No.95 38130 0 0 )

摘　　要：目的 :研究代谢型谷氨酸受体 (mGluRs)激动剂引起大鼠向对侧旋转时介导的受体亚型。方法 :大鼠纹状体内微量注射mGluRs激动剂或拮抗剂 ,观察大鼠的意识、行为变化 ,并于给药后 6h测定旋转活动。结果 :mGluRs非亚型特异的激动剂tACPD (5 0 0、10 0 0nmol)纹状体内注射引起大鼠向对侧旋转 ,mGluRs的非竞争性拮抗剂L -AP3 、竞争性拮抗剂MCPG及抑制细胞内钙释放的胆罗啉均可减轻tACPD引起的旋转。I组mGluRs的特异性激动剂DHPG (5 0 0nmol)纹状体内注射也引起大鼠向对侧旋转 ,MCPG及mGluR1的拮抗剂LY36 7385及mGluR5的拮抗剂MPEP均可拮抗DHPG引起的旋转。预先腹腔注射利血平 (5mg/kg)可阻断DHPG的作用。结论 :I组mGluRs激动引起大鼠向对侧旋转 ,此作用可能与细胞内钙释放有关及依赖于多巴胺的存在。AIM: To study the subtype of metabotropic glutamate receptors (mGluRs) which induce contralateral rotations of rats after mGluRs activation. METHODS: Turning movement was measured at 6 h after agonist or antagonist of mGluRs was microinjected into rat striatum. RESULTS: tACPD, an agonist of mGluRs, at 500 nmol and 1 000 nmol induced contralateral rotations of rats. L-AP 3, MCPG and dantrolene attenuated the turning effect of tACPD. DHPG, a selective agonist of group I mGluRs, mimicked the effect of tACPD. The effect of DHPG was blocked by MCPG, LY367385 (antagonist of mGluR 1) and MPEP (antagonist of mGluR 5), and abolished by pretreatment with reserpine (5 mg/kg). CONCLUSION: These results indicated the activation of group I mGluRs in rat striatum induced turning effect, which may be associated with the mobilization of intracellular Ca 2+ stores and dependant on the existence of dopamine.

关 键 词：代谢型谷氨酸盐类 多巴胺 大鼠 纹状体 对侧旋转 MGLURS 

分 类 号：R966[医药卫生—药理学] R338[医药卫生—药学]