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Neuronal microscale biophysical instability mediates macroscale network dynamics shaping pathological manifestations.

Vipin Kumar1, Victor M Sanchez Franco1, Faith S Ferry1

  • 1Department of Neurosciences, Case Western Reserve University School of Medicine, Cleveland, OH, United States.

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Subtle changes in neuronal electrical activity (action potential timing) can lead to brain-wide diseases like Alzheimer's and epilepsy. Antiepileptic drugs can stabilize this activity, offering new therapeutic avenues.

Keywords:
DrosophilaElectrophysiologyEpilepsyMembrane InstabilityNeuronal DynamicsTauopathyiPS cells

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Area of Science:

  • Neuroscience
  • Biophysics
  • Computational Neuroscience

Background:

  • Linking microscale neuronal biophysics to macroscale brain diseases is challenging.
  • Neuronal dynamic instability can have significant pathological outcomes.
  • Understanding this link is crucial for developing effective treatments for neurological disorders.

Purpose of the Study:

  • To investigate how microscale biophysical variability in neuronal dynamics contributes to macroscale disease phenotypes.
  • To identify the biophysical mechanisms underlying neuronal dynamic instability.
  • To explore therapeutic strategies targeting microscale neuronal dynamics.

Main Methods:

  • Utilized *Drosophila* models with tauopathy and epilepsy mutations.
  • Analyzed action potential timing and voltage-gated sodium channel currents.
  • Examined human induced pluripotent stem cell (iPSC)-derived neurons from Alzheimer's and epilepsy patients.
  • Assessed the effects of antiepileptic drugs on neuronal dynamics.

Main Results:

  • *Drosophila* models showed increased action potential timing instability linked to sodium channel current variability.
  • This microscale instability correlated with macroscale brain state changes.
  • Human iPSC-derived neurons from Alzheimer's and epilepsy patients exhibited similar dynamic instability.
  • Antiepileptic drugs stabilized neuronal dynamics and reversed instabilities in both models.

Conclusions:

  • Microscale neuronal instabilities, particularly in action potential timing and ion channel activity, can propagate to cause macroscopic pathological phenotypes.
  • Variability in voltage-gated sodium channel currents is a potential microscale contributor to dynamic instability.
  • Targeting microscale neuronal dynamics with antiepileptic drugs shows promise as a unifying therapeutic strategy for neurological disorders.