Frequency-independent synaptic transmission supports a linear vestibular behavior.

Frequency-independent synaptic transmission supports a linear vestibular behavior.
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DOI:
10.1016/j.neuron.2008.10.002
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发表时间:
2008-10-23
期刊:
影响因子:
16.2
通讯作者:
du Lac, Sascha
du Lac, Sascha
中科院分区:
医学1区
文献类型:
--
作者:
Bagnall, Martha W.;McElvain, Lauren E.;Faulstich, Michael;du Lac, Sascha

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前庭系统负责将头部运动转化为精确的眼睛、头部和身体运动,从而快速稳定凝视和姿势。中枢兴奋性突触如何在很宽的动态范围内调节与感觉输入精确匹配的行为输出?在这里,我们证明,前庭传入突触在体外表达频率无关的传输,跨越其在体内的动态范围(5 - 150尖峰/秒)。结果表明,单位时间内的突触电荷传递与前庭核投射神经元和内源性神经元的前庭传入活动呈线性相关。无论是突触后谷氨酸受体脱敏或饱和影响稳态传输的相对幅度或频率无关性。最后,我们表明,前庭核神经元可以将突触输入转换成放电率输出的线性变化,而不依赖于一对一的盏传递。这些数据为前庭反射的显著线性提供了生理学基础。
The vestibular system is responsible for transforming head motion into precise eye, head, and body movements that rapidly stabilize gaze and posture. How do central excitatory synapses mediate behavioral outputs accurately matched to sensory inputs over a wide dynamic range? Here we demonstrate that vestibular afferent synapses in vitro express frequency-independent transmission that spans their in vivo dynamic range (5 – 150 spikes/s). As a result, the synaptic charge transfer per unit time is linearly related to vestibular afferent activity in both projection and intrinsic neurons of the vestibular nuclei. Neither postsynaptic glutamate receptor desensitization nor saturation affect the relative amplitude or frequency-independence of steady-state transmission. Finally, we show that vestibular nucleus neurons can transduce synaptic inputs into linear changes in firing rate output, without relying on one-to-one calyceal transmission. These data provide a physiological basis for the remarkable linearity of vestibular reflexes.
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