Ketamine alters oscillatory coupling in the hippocampus.

Ketamine alters oscillatory coupling in the hippocampus.
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DOI:
10.1038/srep02348
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发表时间:
2013
期刊:
影响因子:
4.6
通讯作者:
Tort AB
Tort AB
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Caixeta FV;Cornélio AM;Scheffer-Teixeira R;Ribeiro S;Tort AB

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最近的研究表明,高阶振荡相互作用,如交叉频率耦合是重要的大脑功能受损的精神分裂症,包括感知,注意力和记忆。在这里,我们研究了清醒大鼠海马振荡耦合的动力学NMDA受体阻滞剂氯胺酮,精神分裂症的药理学模型。氯胺酮(25、50和75 mg/kg i. p.) 增加伽马和高频振荡(HFO)在所有深度的CA 1齿状轴,而θ功率的变化取决于解剖位置,并独立于一个短暂的增加三角洲振荡。γ和HFO的相位相干性在海马层中增加。θ和快速振荡之间的相位-振幅耦合以剂量依赖性方式显著改变:氯胺酮在所有剂量下增加海马θ-HFO耦合,而θ-γ耦合在最低剂量下增加,并在最高剂量下被破坏。我们的研究结果表明,氯胺酮改变网络的相互作用,认知相关的theta-gamma耦合。
Recent studies show that higher order oscillatory interactions such as cross-frequency coupling are important for brain functions that are impaired in schizophrenia, including perception, attention and memory. Here we investigated the dynamics of oscillatory coupling in the hippocampus of awake rats upon NMDA receptor blockade by ketamine, a pharmacological model of schizophrenia. Ketamine (25, 50 and 75 mg/kg i.p.) increased gamma and high-frequency oscillations (HFO) in all depths of the CA1-dentate axis, while theta power changes depended on anatomical location and were independent of a transient increase of delta oscillations. Phase coherence of gamma and HFO increased across hippocampal layers. Phase-amplitude coupling between theta and fast oscillations was markedly altered in a dose-dependent manner: ketamine increased hippocampal theta-HFO coupling at all doses, while theta-gamma coupling increased at the lowest dose and was disrupted at the highest dose. Our results demonstrate that ketamine alters network interactions that underlie cognitively relevant theta-gamma coupling.
DOI: 10.1371/journal.pone.0006755
发表时间: 2009-08-25
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