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Non-synaptic Plasticity in Leech Touch Cells.

Sonja Meiser1, Go Ashida1,2, Jutta Kretzberg1,2

  • 1Computational Neuroscience, Department of Neuroscience, Faculty VI, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany.

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|December 13, 2019
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Summary
This summary is machine-generated.

The sodium-potassium pump (Na+/K+-pump) drives non-synaptic plasticity in leech neurons, altering their response to stimulation. This cellular plasticity enhances neuronal communication and enables faster behavioral reactions.

Keywords:
Hodgkin–Huxley neuron modelM-type K+ currentinput resistanceinvertebratemechanoreceptorresting potentialsodium–potassium pumpspike count

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Area of Science:

  • Neuroscience
  • Cellular Plasticity
  • Ion Transport

Background:

  • The Na+/K+-pump is known to mediate activity-dependent synaptic plasticity in various species.
  • Its role in non-synaptic cellular plasticity remains less understood.

Purpose of the Study:

  • To investigate the involvement of the Na+/K+-pump in activity-dependent non-synaptic plasticity in leech sensory neurons.
  • To elucidate the mechanisms underlying changes in neuronal response behavior.

Main Methods:

  • Experimental recordings of resting membrane potential (RMP), spike count (SC), and input resistance (IR) in leech T cells.
  • Development and utilization of a Hodgkin-Huxley-type neuron model to simulate cellular responses.
  • Analysis of synaptic and non-synaptic interactions between T cells.

Main Results:

  • Repeated stimulation caused RMP hyperpolarization, increased SC, and increased IR in T cells.
  • The neuron model indicated increased Na+/K+-pump activity leads to RMP hyperpolarization and altered potassium channel activity.
  • Changes in T cell spiking behavior influenced postsynaptic responses, suggesting non-synaptic plasticity as the primary mechanism.

Conclusions:

  • The Na+/K+-pump is crucial for activity-dependent non-synaptic plasticity in leech sensory neurons.
  • This plasticity mechanism alters neuronal response patterns, potentially acting as a gain-control system.
  • These adaptations enhance the leech's ability to react quickly to tactile stimuli.