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首页> 外文期刊>Neuron >Calcium microdomains in aspiny dendrites.
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Calcium microdomains in aspiny dendrites.

机译:棘状树突中的钙微区。

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摘要

Dendritic spines receive excitatory synapses and serve as calcium compartments, which appear to be necessary for input-specific synaptic plasticity. Dendrites of GABAergic interneurons have few or no spines and thus do not possess a clear morphological basis for synapse-specific compartmentalization. We demonstrate using two-photon calcium imaging that activation of single synapses on aspiny dendrites of neocortical fast spiking (FS) interneurons creates highly localized calcium microdomains, often restricted to less than 1 microm of dendritic space. We confirm using ultrastructural reconstruction of imaged dendrites the absence of any morphological basis for this compartmentalization and show that it is dependent on the fast kinetics of calcium-permeable (CP) AMPA receptors and fast local extrusion via the Na(+)/Ca(2+) exchanger. Because aspiny dendrites throughout the CNS express CP-AMPA receptors, we propose that CP-AMPA receptors mediate a spine-free mechanism of input-specific calcium compartmentalization.
机译:树突棘接受兴奋性突触并充当钙区室,这似乎是输入特异性突触可塑性所必需的。 GABA能中神经元的树突很少或没有刺,因此不具有明确的突触特异性区室化形态基础。我们证明了使用双光子钙成像,新皮层快速突峰(FS)interneurons的棘突树突上的单个突触的激活创建高度局部化的钙微域,通常限制在少于1微米的树突空间。我们确认使用超微结构重建的图像树突没有这种分隔的任何形态学基础,并表明它取决于钙可渗透(CP)AMPA受体的快速动力学和通过Na(+)/ Ca(2)的快速局部挤出+)交换器。因为整个CNS中的树突状树突均表达CP-AMPA受体,所以我们建议CP-AMPA受体介导无刺的输入特异性钙区隔机制。

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