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      Beta-amyloid induced changes in A-type K⁺ current can alter hippocampo-septal network dynamics.

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          Abstract

          Alzheimer's disease (AD) progression is usually associated with memory deficits and cognitive decline. A hallmark of AD is the accumulation of beta-amyloid (Aβ) peptide, which is known to affect the hippocampal pyramidal neurons in the early stage of AD. Previous studies have shown that Aβ can block A-type K(+) currents in the hippocampal pyramidal neurons and enhance the neuronal excitability. However, the mechanisms underlying such changes and the effects of the hyper-excited pyramidal neurons on the hippocampo-septal network dynamics are still to be investigated. In this paper, Aβ-blocked A-type current is simulated, and the resulting neuronal and network dynamical changes are evaluated in terms of the theta band power. The simulation results demonstrate an initial slight but significant theta band power increase as the A-type current starts to decrease. However, the theta band power eventually decreases as the A-type current is further decreased. Our analysis demonstrates that Aβ blocked A-type currents can increase the pyramidal neuronal excitability by preventing the emergence of a steady state. The increased theta band power is due to more pyramidal neurons recruited into spiking mode during the peak of pyramidal theta oscillations. However, the decreased theta band power is caused by the spiking phase relationship between different neuronal populations, which is critical for theta oscillation, is violated by the hyper-excited pyramidal neurons. Our findings could provide potential implications on some AD symptoms, such as memory deficits and AD caused epilepsy.

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          Author and article information

          Journal
          J Comput Neurosci
          Journal of computational neuroscience
          1573-6873
          0929-5313
          Jun 2012
          : 32
          : 3
          Affiliations
          [1 ] Intelligent Systems Research Centre, University of Ulster, Magee Campus, Derry, Northern Ireland, UK. x.zou@hotmail.co.uk
          Article
          10.1007/s10827-011-0363-7
          21938438
          d4d0d22c-c598-46fc-8af9-a1b7c3124263
          History

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