Dendritic position is a major determinant of presynaptic strength.

Dendritic position is a major determinant of presynaptic strength.
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DOI:
10.1083/jcb.201112135
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发表时间:
2012-04-16
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Verhage M
Verhage M
中科院分区:
其他
文献类型:
--
作者:
de Jong AP;Schmitz SK;Toonen RF;Verhage M

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独立于神经元活动的位置信息调节突触前强度,最强的突触前末梢最靠近索马。不同的调节原则影响神经元之间的突触耦合,包括位置原则。在锥体神经元的树突中,突触后敏感性取决于突触的位置,远端突触具有最高的增益。在本文中,我们调查是否存在类似的规则,在锥体和齿状回(DG)神经元的混合网络的突触前末梢。出乎意料的是,远端突触的囊泡蛋白vGlut,vGAT,Synaptotagmin,和VAMP和许多非囊泡蛋白,包括巴松管,Munc18,和突触融合蛋白的染色强度最低。同时,远端突触在刺激时显示较少的囊泡释放。这种依赖性突触前强度的树突位置持续后,长期阻断动作电位放电和突触后受体,但显着减少DG树突相比,锥体树突。这些数据揭示了一个新的规则,独立的神经元活动,调节突触前强度根据树突的位置,最强的终端最接近的索马。这种梯度与锥体树突中观察到的突触后梯度相反,不同的细胞类型在不同程度上应用这一规则。
Positional information, independent of neuronal activity, regulates presynaptic strength, with the strongest presynaptic terminals closest to the soma. Different regulatory principles influence synaptic coupling between neurons, including positional principles. In dendrites of pyramidal neurons, postsynaptic sensitivity depends on synapse location, with distal synapses having the highest gain. In this paper, we investigate whether similar rules exist for presynaptic terminals in mixed networks of pyramidal and dentate gyrus (DG) neurons. Unexpectedly, distal synapses had the lowest staining intensities for vesicular proteins vGlut, vGAT, Synaptotagmin, and VAMP and for many nonvesicular proteins, including Bassoon, Munc18, and Syntaxin. Concomitantly, distal synapses displayed less vesicle release upon stimulation. This dependence of presynaptic strength on dendritic position persisted after chronically blocking action potential firing and postsynaptic receptors but was markedly reduced on DG dendrites compared with pyramidal dendrites. These data reveal a novel rule, independent of neuronal activity, which regulates presynaptic strength according to dendritic position, with the strongest terminals closest to the soma. This gradient is opposite to postsynaptic gradients observed in pyramidal dendrites, and different cell types apply this rule to a different extent.
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