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Silent glutamatergic synapses and nociception in mammalian spinal cord.

机译:哺乳动物脊髓中的沉默谷氨酸能突触和伤害感受。

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摘要

Neurons in the superficial dorsal horn of the spinal cord are important for conveying sensory information from the periphery to the central nervous system. Some synapses between primary afferent fibres and spinal dorsal horn neurons may be inefficient or silent. Ineffective sensory transmission could result from a small postsynaptic current that fails to depolarize the cell to threshold for an action potential or from a cell with a normal postsynaptic current but an increased threshold for action potentials. Here we show that some cells in the superficial dorsal horn of the lumbar spinal cord have silent synapses: they do not respond unless the holding potential is moved from -70 mV to +40 mV. Serotonin (5-hydroxytryptamine, 5-HT), an important neurotransmitter of the raphe-spinal projecting pathway, transforms silent glutamatergic synapses into functional ones. Therefore, transformation of silent glutamatergic synapses may serve as a cellular mechanism for central plasticity in the spinal cord.
机译:脊髓浅背角中的神经元对于将感觉信息从周围传递到中枢神经系统很重要。初级传入纤维和脊髓背角神经元之间的某些突触可能是无效的或沉默的。无效的感觉传递可能是由于小的突触后电流未能使细胞去极化到动作电位的阈值,或者是由于具有正常突触后电流但动作电位的阈值增加的细胞。在这里,我们显示腰椎浅表背角中的某些细胞具有沉默突触:除非保持电位从-70 mV移至+40 mV,否则它们不会做出反应。 5-羟色胺(5-羟色胺,5-HT),是沟纹-脊髓投射途径的重要神经递质,将沉默的谷氨酸能突触转变为功能性突触。因此,沉默的谷氨酸能突触的转化可以作为脊髓中枢可塑性的细胞机制。

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