Overexpression of cypin alters dendrite morphology, single neuron activity, and network properties via distinct mechanisms.

Overexpression of cypin alters dendrite morphology, single neuron activity, and network properties via distinct mechanisms.
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DOI:
10.1088/1741-2552/aa976a
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发表时间:
2018-03
影响因子:
4
通讯作者:
Firestein BL
Firestein BL
中科院分区:
工程技术2区
文献类型:
--
作者:
Rodríguez AR;O'Neill KM;Swiatkowski P;Patel MV;Firestein BL

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本研究调查的效果,过度表达的胞质PSD-95相互作用(cypin),突触PSD-95蛋白定位的调节器和树突分支的核心调节器,施加在大鼠海马神经元和网络的电活动。我们培养大鼠海马神经元,并使用脂质介导的转染和慢病毒基因转移,以实现高水平的cypin或cypin突变体(cypinΔPDZ; PSD-95非结合)表达细胞和网络范围内,分别。我们的分析表明,尽管cypin和cypinΔPDZ的过表达增加了树突数量并降低了棘密度,但cypin和cypinΔPDZ明显调节神经元活动。在单细胞水平,cypin促进爆发活性的降低,而cypinΔPDZ降低sEPSC频率,并与cypin相比进一步降低爆发。在网络水平上,通过使用Fano因子作为尖峰计数变异性的量度,cypin过表达导致尖峰计数的变异性增加,并且当cypin不能结合PSD-95时,这种效应被消除。这种变异性还取决于基线活动水平和随时间推移的平均峰电位率。最后,我们的尖峰分选数据表明,cypin的过度表达导致尖峰波形的更复杂的分布,并且与PSD-95的结合对于这种复杂性至关重要。我们的数据表明,树突形态不起主要作用,cypin行动的电活动。
This study investigates the effect that overexpression of cytosolic PSD-95 interactor (cypin), a regulator of synaptic PSD-95 protein localization and a core regulator of dendrite branching, exerts on the electrical activity of rat hippocampal neurons and networks. We cultured rat hippocampal neurons and used lipid-mediated transfection and lentiviral gene transfer to achieve high levels of cypin or cypin mutant (cypinΔPDZ; PSD-95 non-binding) expression cellularly and network-wide, respectively. Our analysis revealed that although overexpression of cypin and cypinΔPDZ increase dendrite numbers and decrease spine density, cypin and cypinΔPDZ distinctly regulate neuronal activity. At the single cell level, cypin promotes decreases in bursting activity while cypinΔPDZ reduces sEPSC frequency and further decreases bursting compared to cypin. At the network level, by using the Fano factor as a measure of spike count variability, cypin overexpression results in an increase in variability of spike count, and this effect is abolished when cypin cannot bind PSD-95. This variability is also dependent on baseline activity levels and on mean spike rate over time. Finally, our spike sorting data show that overexpression of cypin results in a more complex distribution of spike waveforms and that binding to PSD-95 is essential for this complexity. Our data suggest that dendrite morphology does not play a major role in cypin action on electrical activity.
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