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机构地区:[1]南京医科大学药理学与神经生物学系
出 处:《中国临床药理学与治疗学》2005年第10期1096-1099,共4页Chinese Journal of Clinical Pharmacology and Therapeutics
基 金:国家自然科学基金(№39970846)江苏省卫生自然科学基金(№H9922)
摘 要:目的:探讨Ⅱ、Ⅲ组亲代谢型谷氨酸受体(metabotropic glutamate receptors,mGluRs)激动剂对1-甲基-4-苯基吡啶离子(1-metyl-4-phenylpyridinium,MPP^+)抑制C6胶质瘤细胞摄取谷氨酸(glutamate,Glu)的影响。方法:应用同位素标记法测定C6胶质瘤细胞对培养液中[~3H]-D,L-谷氨酸的摄取。结果:Ⅱ组mGluRs激动剂(2S,2’R,3’R)-2-(2’,3’-di-carboxycyclopropyl)glycine(DCG-Ⅳ)和Ⅲ组mGluRs激动刺L(+)-2-amino-4-phosphonobutyric acid(LAP4)100μmol·L^(-1)可以逆转MPP^+抑制C6胶质瘤细胞摄取Glu的作用,而Ⅱ组mGluRs拮抗剂(RS)-1-Amino-5-phosphonoinan-1-carboxylic acid(APICA)和Ⅲ组mGluRs拮抗剂(RS)-α-methvlserine-O-phosphate(MSOP)可以完全阻断其激动剂的逆转作用。 结论:激活C6胶质瘤细胞上的Ⅱ、Ⅲ组mGluRs可以通过促进谷氨酸转运体摄取Glu、进而降低细胞外液的Glu浓度。AIM: To study the effect of group Ⅱ and Ⅲ metabotropic glutamate receptors (mGluRs) agonists on 1-methyl-4-phenylpyridinium (MPP^+ )-induced glutamate uptake inhibition in C6 glioma cells. METHODS: The glutamate uptake into astrocytes was measured by using radio-ligand binding assay method. RESULTS: It was shown that Group Ⅱ mGluRs agonist (2' S, 2' R, 3' R)-2-( 2', 3' -dicarboxycyclopropyl ) glycine ( DCG-Ⅳ) ( 100μmol·L^-1 ) and Group Ⅲ mGluRs agonist L ( + )- 2-amino-4-phosphonobutyric acid ( L-AP4 ) ( 100 μmol·L^-1) significantly reversed MPP^+ -induced glutamate uptake inhibition. Furthermore, the enhancement effects of DCG-Ⅳ and L-AP4 were blocked by their respective antagonists, ( RS)-1-Amino-5-phosphonoinan-1-carboxylic acid ( APICA ) and ( RS )-α-methylserine-O-phosphate (MSOP). CONCLUSION: Group Ⅱ and Ⅲ mGluRs agonists produce neuroprotective effects by enhancing the activity of glutamate transporters.
关 键 词:亲代谢型谷氨酸受体 1-甲基-4-苯基吡啶离子 C6胶质瘤细胞 谷氨酸摄取
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