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Can a local, PKMξ dependent translational switch account for the maintenance of synaptic plasticity?

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Memory can last a human lifetime, yet at the synaptic level it is encoded by proteins that turnover at rates that are much faster than the lifetime of memory. A critical open question in the neuroscience of learning and memory is how memory and its cellular basis synaptic plasticity can be maintained for longer than its molecular substrates. Recently it has been shown that the activity of a brain specific kinase, PKMξ, is necessary for the maintenance but not the induction of synaptic plasticity. It is also known that synthesis of new proteins is necessary for inducing long lasting synaptic plasticity and memory. We postulate that a molecular network that includes activation, translation and degradation of PKMξ can be a bi-stable molecular switch, that can account for the maintenance of long-term synaptic plasticity and memory. We formulate a mathematical model of such a molecular network, and show that it can be bi-stable and that it accounts for many of the experimental observations regarding the activation, synthesis and inhibition of PKMξ. Our model also makes testable experimental predictions.

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Correspondence to Naveed Aslam.

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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Aslam, N., Shouval, H.Z. Can a local, PKMξ dependent translational switch account for the maintenance of synaptic plasticity?. BMC Neurosci 11, P109 (2010) doi:10.1186/1471-2202-11-S1-P109

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Keywords

  • Mathematical Model
  • Animal Model
  • Experimental Observation
  • Synaptic Plasticity
  • Molecular Network