Strong CA2 pyramidal neuron synapses define a powerful disynaptic cortico-hippocampal loop.

Strong CA2 pyramidal neuron synapses define a powerful disynaptic cortico-hippocampal loop.
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DOI:
10.1016/j.neuron.2010.04.013
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发表时间:
2010-05-27
期刊:
影响因子:
16.2
通讯作者:
Siegelbaum SA
Siegelbaum SA
中科院分区:
医学1区
文献类型:
--
作者:
Chevaleyre V;Siegelbaum SA

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神经元通过整合数千个突触输入来产生动作电位输出,从而通过电路传播信息。来自不同来源的输入通常针对神经元树突树的不同区域,与更近端树突上的突触相比,更远端树突上的突触通常对细胞输出的影响较弱。在这里,我们报告,海马CA2区锥体神经元,其功能仍然不明了75年,有一个逆转的突触强度规则。因此,CA2神经元被来自内嗅皮层的远端树突输入强烈激活,但仅被来自海马CA3神经元的更近端树突输入弱激活。CA2神经元又与CA1神经元形成强兴奋性突触接触。以这种方式,CA2神经元形成高度可塑性的双突触回路的连结,该双突触回路将皮层输入海马体到其CA1神经元输出。这个回路很可能介导依赖于大脑的空间记忆的关键方面。
Neurons propagate information through circuits by integrating thousands of synaptic inputs to generate an action potential output. Inputs from different origins are often targeted to distinct regions of a neuron’s dendritic tree, with synapses on more distal dendrites normally having a weaker influence on cellular output compared to synapses on more proximal dendrites. Here we report that hippocampal CA2 pyramidal neurons, whose function has remained obscure for 75 years, have a reversed synaptic strength rule. Thus, CA2 neurons are strongly excited by their distal dendritic inputs from entorhinal cortex but only weakly activated by their more proximal dendritic inputs from hippocampal CA3 neurons. CA2 neurons in turn make strong excitatory synaptic contacts with CA1 neurons. In this manner CA2 neurons form the nexus of a highly plastic disynaptic circuit linking the cortical input to the hippocampus to its CA1 neuronal ouput. This circuit is likely to mediate key aspects of hippocampal-dependent spatial memory.
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