Competition between recently potentiated synaptic inputs reveals a winner-take-all phase of synaptic tagging and capture

Competition between recently potentiated synaptic inputs reveals a winner-take-all phase of synaptic tagging and capture
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最近增强的突触输入之间的竞争揭示了突触标记和捕获的赢家通吃阶段

DOI:
10.1073/pnas.1403643111
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发表时间:
2014
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
通讯作者:
Morris
Morris
中科院分区:
--
文献类型:
--
作者:
Sajikumar;Morris

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经典模型表明,长期记忆的机制包括突触特异的、蛋白质合成不依赖的诱导阶段(突触重量的变化/这种突触的临时标记),以及在相邻的树突间隔内,可能伴随或紧接在诱导之前的蛋白质合成依赖的分配阶段,其蛋白质产物通过突触捕获实现巩固。我们现在报告说,当突触在诱导过程中被增强时,这个分配阶段以“赢家通吃”的方式相互竞争,争夺可塑性相关的蛋白质。这一发现突显了突触竞争在不受干扰的情况下在神经网络中创造稳定的持久记忆的重要性。
Canonical models suggest that mechanisms of long-term memory consist of a synapse-specific, protein synthesis-independent induction phase (changes in synaptic weights/temporary tagging of such synapses) and, within adjacent dendritic compartments, a protein synthesis-dependent distribution phase that may accompany or immediately precede induction and whose protein products enable consolidation through synaptic capture. We now report that this distribution phase is competitive in a “winner-take-all” fashion when synapses potentiated at induction compete with each other for plasticity-related proteins. This finding highlights the importance of synaptic competition in creating stable long-lasting memory in neural networks without disruption.
顶端 CA1 树突的不同区室具有不同的表达突触标记和捕获的可塑性阈值
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