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Related Experiment Videos

Active dendrites, potassium channels and synaptic plasticity.

Daniel Johnston1, Brian R Christie, Andreas Frick

  • 1Division of Neuroscience, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA. dan@mossy.bcm.tmc.edu

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|May 13, 2003
PubMed
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Back-propagating action potentials (APs) in hippocampal neurons, when combined with synaptic input, can induce synaptic plasticity like long-term potentiation (LTP). A-type potassium channels influence AP amplitude and are crucial for LTP induction and expression.

Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Synaptic Plasticity

Background:

  • Dendrites of CA1 pyramidal neurons possess diverse voltage-gated ion channels with non-uniform distributions.
  • Sodium, calcium, and potassium channels in dendrites mediate action potential back-propagation, calcium dynamics, and excitability regulation.

Purpose of the Study:

  • To investigate the role of back-propagating action potentials (APs) and dendritic ion channels in synaptic plasticity.
  • To determine how coincident synaptic input and APs influence long-term depression (LTD) and long-term potentiation (LTP) induction.

Main Methods:

  • Examined the correlation between intracellular calcium levels and LTD/LTP induction.
  • Utilized a theta-burst pairing paradigm to assess AP invasion into dendrites during LTP induction.

Related Experiment Videos

  • Investigated the contribution of A-type potassium channels to AP amplitude and LTP.

    • Main Results:

    • Back-propagating APs coincident with synaptic input can induce LTD or LTP, dependent on intracellular calcium rise magnitude.
    • LTP induction requires AP invasion into the dendrites, influenced by A-type potassium channel activity.
    • Modulation of A-type potassium channels during LTP expression leads to local dendritic excitability changes.

    Conclusions:

    • Active dendritic properties significantly contribute to synaptic integration and plasticity in hippocampal neurons.
    • A-type potassium channels play a critical role in regulating dendritic excitability and the induction/expression of LTP.