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Author Spotlight: Understanding the Impact of Pathological Proteins on Axonal Transport in Neurodegenerative Diseases
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Modeling tau transport in the axon initial segment.

Ivan A Kuznetsov1, Andrey V Kuznetsov2

  • 1Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104, USA.

Mathematical Biosciences
|September 13, 2020
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Summary

This study models tau protein transport in neurons, revealing how its movement into the axon initial segment (AIS) is driven by diffusion and motor proteins. The findings highlight the AIS

Keywords:
Alzheimer’s diseaseAxonMathematical modelingNeuronTau diffusion barrier

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biophysics

Background:

  • Tau protein is crucial for microtubule stability and axonal transport, and its dysfunction is implicated in neurodegenerative diseases like Alzheimer's.
  • Axonal transport is essential for neuronal function, but the specific mechanisms governing tau protein dynamics, particularly in the axon initial segment (AIS), remain incompletely understood.

Purpose of the Study:

  • To develop and validate a mathematical model for tau protein transport dynamics within the axon and the axon initial segment (AIS).
  • To investigate the interplay between different tau transport mechanisms, including motor-driven and diffusion-driven transport, within the AIS.

Main Methods:

  • Developed a computational model simulating tau protein transport, considering seven kinetic states.
  • Calibrated the model using experimental data for tau transport in the axon.
  • Utilized an assumed linear increase in tau concentration within the AIS to determine kinetic constants specific to this region.

Main Results:

  • The model successfully predicts tau transport in both the axon and the AIS.
  • Tau binding to microtubules in the AIS creates a negative gradient, driving diffusion-driven transport from the soma.
  • A synergistic interaction between slow axonal transport and diffusion-driven transport was observed in the AIS, with diffusion dominating near the soma and motor-driven transport increasing with distance.

Conclusions:

  • This study presents the first mathematical model of tau transport specifically in the AIS.
  • The findings suggest that the AIS acts as a 'pump,' utilizing a combination of diffusion and motor-driven transport to move tau into the axon.
  • Understanding these transport dynamics is crucial for deciphering the role of tau in neuronal health and disease.