Acetylcholine boosts dendritic NMDA spikes in a CA3 pyramidal neuron model
Acetylcholine boosts dendritic NMDA spikes in a CA3 pyramidal neuron model
复制标题
乙酰胆碱增强 CA3 锥体神经元模型中的树突状 NMDA 峰值
DOI:
10.1101/2021.03.01.433406
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Humphries R
中科院分区:
文献类型:
--
作者:
Humphries R
Acetylcholine has been proposed to facilitate the formation of memory ensembles within the hippocampal CA3 network, by enhancing plasticity at CA3-CA3 recurrent synapses. Regenerative NMDA receptor (NMDAR) activation in CA3 neuron dendrites (NMDA spikes) increase synaptic Ca2+influx and can trigger this synaptic plasticity. Acetylcholine inhibits potassium channels which enhances dendritic excitability and therefore could facilitate NMDA spike generation. Here, we investigate NMDAR-mediated nonlinear synaptic integration in stratum radiatum (SR) and stratum lacunosum moleculare (SLM) dendrites in a reconstructed CA3 neuron computational model and study the effect of cholinergic inhibition of potassium conductances on this nonlinearity. We found that distal SLM dendrites, with a higher input resistance, had a lower threshold for NMDA spike generation compared to SR dendrites. Simulating acetylcholine by blocking potassium channels (M-type, A-type, Ca2+-activated, and inwardly-rectifying) increased dendritic excitability and reduced the number of synapses required to generate NMDA spikes, particularly in the SR dendrites. The magnitude of this effect was heterogeneous across different dendritic branches within the same neuron. These results predict that acetylcholine facilitates dendritic integration and NMDA spike generation in selected CA3 dendrites which could strengthen connections between specific CA3 neurons to form memory ensembles.
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影响因子:
16.6
作者:
Mishra RK;Kim S;Guzman SJ;Jonas P
通讯作者:
Jonas P
影响因子:
3.7
作者:
Degro CE;Kulik A;Booker SA;Vida I
通讯作者:
Vida I
DOI:
10.1073/pnas.1317667111
发表时间:
2014-03-18
影响因子:
11.1
作者:
Brandalise, Federico;Gerber, Urs
通讯作者:
Gerber, Urs
DOI:
10.1523/jneurosci.5719-09.2010
发表时间:
2010-03
期刊:
The Journal of Neuroscience
影响因子:
--
作者:
Miwako Yamasaki;M. Matsui;Masahiko Watanabe
通讯作者:
Miwako Yamasaki;M. Matsui;Masahiko Watanabe
DOI:
--
发表时间:
2016-04
期刊:
ArXiv
影响因子:
--
作者:
N. Hansen
通讯作者:
N. Hansen