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Cell anatomy and network input explain differences within but not between leech touch cells at two different

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Summary

Mechanosensory touch cells in leeches show variable excitability. Differences in anatomical structure, specifically the number of root processes, contribute to this variability, alongside synaptic input and time-dependent changes.

Keywords:
invertebratemechanoreceptormulti-compartment modelneuronal anatomyneuronal excitabilityresponse variability

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biophysics

Background:

  • Mechanosensory cells in leeches share similarities with human skin mechanoreceptors.
  • Leech touch (T) cells exhibit significant variability in excitability and response to stimulation.
  • Previous research indicates T cells' excitability changes over time.

Purpose of the Study:

  • To investigate the causes of excitability variability in leech T cells.
  • To compare T cells at two soma locations (T2 and T3) based on three hypotheses: time-dependent excitability changes, synaptic input, and anatomical structure.
  • To elucidate the electrophysiological differences between T2 and T3 cells.

Main Methods:

  • Electrophysiological double recordings to measure cellular responses.
  • 3D reconstruction of neurobiotin-filled T cells to analyze anatomy.
  • Compartmental model simulations to model cell responses and test hypotheses.

Main Results:

  • T2 cells showed significantly higher excitability (more spikes, shorter latency, larger amplitude) than T3 cells upon current injection.
  • Both T2 and T3 cells exhibited similar time-dependent increases in excitability.
  • Anatomical differences were observed: T2 cells consistently had two root processes, while 50% of T3 cells had only one. T3 cells with one root process were less excitable.
  • Simulations indicated that anatomical subtypes did not differ in excitability under uniform biophysical conditions.

Conclusions:

  • Variability in leech T cell excitability is likely multifactorial, influenced by time-dependent changes, synaptic input, and anatomical structure.
  • A systematic difference in excitability exists between T2 and T3 cells, partly explained by anatomical variations in root processes.
  • Further research using patch-clamp and advanced modeling is necessary to understand the role of biophysical properties and ion channel distribution in T cell electrophysiology.