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首页> 外文期刊>Acta Pharmacologica Sinica >NMDA and AMPA receptors mediate intracellular calcium increase in rat cortical astrocytes
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NMDA and AMPA receptors mediate intracellular calcium increase in rat cortical astrocytes

机译:NMDA和AMPA受体介导大鼠皮质星形胶质细胞的细胞内钙增加

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AIM: To study the effect of glutamate on the intracellular calcium signal of pure cultured rat astrocytes and the role of N-methyl-D-aspartate (NMDA) and alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid (AMPA) receptors in the procedure. METHODS: The fluorescence of calcium was measured by Fura-2/AM (F_(345)/F_(380)). RESULTS: L-Glutamate induced [Ca~(2+)]_i increase in most of the cells in concentration- and time-dependent manner. NMDA 50 mmol/L induced the fluorescence increase by almost three to four times, while the effect of AMPA 50 mmol/L was just half of that of D-(-)-2-amino-5-phosphonopentanoic acid (D-AP-5; a selective antagonist of the NMDA receptor). 6-Cyano-7-nitroquinoxaline-2,3-dione (CNQX, a selective antagonist of the AMPA receptor) abolished the effects of NMDA and AMPA, respectively. D-AP-5 and CNQX simultaneously or respectively attenuated the effect of L-glutamate at different degrees, but could not abolish it entirely. CONCLUSION: Glutamate modulated intracellular Ca~(2+) of pure cultured rat astrocytes through different pathways. The activation of NMDA and AMPA receptors took part in the complex mechanisms.
机译:目的:研究谷氨酸对纯培养大鼠星形胶质细胞胞内钙信号的影响以及N-甲基-D-天冬氨酸(NMDA)和α-氨基-3-羟基-5-羟基-5-甲基-4-异恶唑-丙酸的作用酸(AMPA)受体。方法:采用Fura-2 / AM(F_(345)/ F_(380))测定钙的荧光。结果:L-谷氨酸诱导的大多数细胞中的[Ca〜(2 +)] _ i以浓度和时间依赖性方式增加。 NMDA 50 mmol / L诱导的荧光增加了近三到四倍,而AMPA 50 mmol / L的作用仅为D-(-)-2-氨基-5-膦基戊酸(D-AP- 5; NMDA受体的选择性拮抗剂)。 6-氰基-7-硝基喹喔啉-2,3-二酮(CNQX,AMPA受体的选择性拮抗剂)分别消除了NMDA和AMPA的作用。 D-AP-5和CNQX在不同程度上同时或分别减弱了L-谷氨酸的作用,但不能完全消除。结论:谷氨酸通过不同途径调节纯培养大鼠星形胶质细胞的细胞内Ca〜(2+)。 NMDA和AMPA受体的激活参与了复杂的机制。

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