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Updated: May 5, 2026
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Three-dimensional Imaging and Analysis of Mitochondria within Human Intraepidermal Nerve Fibers
Published on: September 29, 2017
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Mitochondrial mechanics nucleates axonal jamming and swelling
Patrick S Noerr1, Ahmed A Abushawish2, Gulcin Pekkurnaz2
1Department of Pharmacology, School of Medicine, University of California San Diego.
Arxiv
|May 4, 2026
Summary
Mitochondrial shape and flexibility impact axonal transport, causing traffic jams that can damage neurons. Fusion helps restore transport, while fission worsens it, affecting neuronal integrity.
Area of Science:
- Cell Biology
- Neuroscience
- Biophysics
Background:
- Neuronal function depends on mitochondria positioned precisely to meet energy needs.
- Physical factors controlling mitochondrial transport in axons are not well understood.
- Mitochondrial collisions during bidirectional transport may cause failure and damage.
Purpose of the Study:
- To model the physical constraints on mitochondrial transport in axons.
- To investigate how mitochondrial shape, mechanics, and dynamics influence transport.
- To understand the link between mitochondrial transport, axonal integrity, and pathology.
Main Methods:
- Developed an agent-based model simulating mitochondrial motility, morphology, and lifecycle.
- Coupled organelle dynamics to a deformable axonal boundary.
- Analyzed the effects of organelle shape, mechanical properties, and fission-fusion dynamics.
Main Results:
- Mitochondrial traffic jams arise from a balance of propulsion and steric interactions.
- Organelle shape and rigidity influence jamming severity; elongated, rigid mitochondria transport faster.
- Fission exacerbates transport disruption, while fusion improves traffic by creating aligned structures.
- Sustained jamming causes mechanical stress, leading to axonal deformation and swelling.
Conclusions:
- Mitochondrial dynamics and axonal integrity are physically linked.
- Dysregulated mitochondrial fission-fusion balance can cause transport failure and neuronal pathology.
- Model provides testable predictions for neuronal transport disorders.
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