Conserved properties of dendritic trees in four cortical interneuron subtypes.

Conserved properties of dendritic trees in four cortical interneuron subtypes.
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DOI:
10.1038/srep00089
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发表时间:
2011
期刊:
影响因子:
4.6
通讯作者:
Kawaguchi, Yasuo
Kawaguchi, Yasuo
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kubota, Yoshiyuki;Karube, Fuyuki;Nomura, Masaki;Gulledge, Allan T.;Mochizuki, Atsushi;Schertel, Andreas;Kawaguchi, Yasuo

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树突树影响突触整合和神经元的兴奋性,但似乎以相当任意的模式发展。使用电子显微镜和系列重建,我们分析了树突状树的四个形态不同的新皮层中间神经元亚型,揭示两个基本的组织原则,共同所有。首先,在一个树突内的任何给定点的横截面积是成比例的所有树突段远端的总长度。与这一观察结果一致,总横截面积在分叉点几乎完全守恒。第二,树突横截面在更近端、更大直径的树突位置逐渐变得更椭圆。最后,计算机模拟显示,这些保守的形态学特征限制了体细胞EPSP的距离依赖性过滤,并促进了体细胞去极化分布到所有树突状隔室。因为这些特征是所有研究的中间神经元所共有的,它们可能代表了树突树不同形态的共同组织原则。
Dendritic trees influence synaptic integration and neuronal excitability, yet appear to develop in rather arbitrary patterns. Using electron microscopy and serial reconstructions, we analyzed the dendritic trees of four morphologically distinct neocortical interneuron subtypes to reveal two underlying organizational principles common to all. First, cross-sectional areas at any given point within a dendrite were proportional to the summed length of all dendritic segments distal to that point. Consistent with this observation, total cross-sectional area was almost perfectly conserved at bifurcation points. Second, dendritic cross-sections became progressively more elliptical at more proximal, larger diameter, dendritic locations. Finally, computer simulations revealed that these conserved morphological features limit distance dependent filtering of somatic EPSPs and facilitate distribution of somatic depolarization into all dendritic compartments. Because these features were shared by all interneurons studied, they may represent common organizational principles underlying the otherwise diverse morphology of dendritic trees.
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