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Glutamate spillover mediates excitatory transmission in the rat olfactory bulb (see comments)

机译:谷氨酸外溢介导大鼠嗅球中的兴奋性传递(见评论)

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摘要

In the CNS, glutamate typically mediates excitatory transmission via local actions at synaptic contacts. In the olfactory bulb, mitral cell dendrites release glutamate at synapses formed only onto the dendrites of inhibitory granule cells. Here, I show excitatory transmission mediated solely by transmitter spillover between mitral cells in olfactory bulb slices. Dendritic glutamate release from individual mitral cells causes self-excitation via local activation of N-methyl-D-aspartate (NMDA) receptors. Paired recordings reveal that glutamate release from one cell generates NMDA receptor-mediated responses in neighboring mitral cells that are enhanced by blockade of glutamate uptake. Furthermore, spillover generates spontaneous NMDA receptor-mediated population responses. This simultaneous activation of neighboring mitral cells by a diffuse action of glutamate provides a mechanism for synchronizing olfactory principal cells.
机译:在中枢神经系统中,谷氨酸通常通过突触接触处的局部作用介导兴奋性传递。在嗅球中,二尖瓣细胞树突在仅形成于抑制性颗粒细胞的树突上的突触处释放谷氨酸。在这里,我展示了仅由嗅球切片中的二尖瓣细胞之间的递质溢出介导的兴奋性传递。从单个二尖瓣细胞释放的树突状谷氨酸盐通过N-甲基-D-天冬氨酸(NMDA)受体的局部激活引起自激。配对记录显示,从一个细胞释放出谷氨酸盐会在邻近的二尖瓣细胞中产生NMDA受体介导的反应,该反应会因谷氨酸盐的吸收阻滞而增强。此外,溢出会产生自发的NMDA受体介导的种群反应。谷氨酸的扩散作用同时激活邻近的二尖瓣细胞,提供了一种同步嗅觉主细胞的机制。

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