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Propagation of Action Potentials01:23

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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
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Updated: Jan 18, 2026

Assessment of Open Probability of the Mitochondrial Permeability Transition Pore in the Setting of Coenzyme Q Excess
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Mitochondria delay action potential propagation.

Ann M Castelfranco1, Pepe Alcami2,3

  • 1Békésy Laboratory of Neurobiology, Pacific Biosciences Research Center, University of Hawai'i at Mānoa, Honolulu, HI, USA.

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This summary is machine-generated.

Axons, the nerve cells that transmit electrical signals, slow down when their mitochondria partially block internal pathways. This finding reveals how mitochondria impact nerve signal timing and processing in small axons.

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Area of Science:

  • Neuroscience
  • Computational Biology
  • Cell Biology

Background:

  • Action potential conduction velocity is determined by axonal internal resistance.
  • Axons are typically modeled as organelle-free, neglecting mitochondrial impact on resistance and conduction.
  • The role of mitochondria in modulating axonal conduction velocity remains understudied.

Purpose of the Study:

  • To investigate the impact of axonal mitochondria on action potential conduction velocity.
  • To quantify the delay introduced by mitochondria in unmyelinated axons.
  • To understand how mitochondrial presence affects information processing in small-diameter axons.

Main Methods:

  • Computational modeling of action potential propagation in axons.
  • Electron microscopy of forebrain premotor axons from birdsong control circuits.
  • Analysis of conduction velocity changes due to mitochondrial obstruction.

Main Results:

  • Mitochondria decrease axonal conduction velocity, causing delays of microseconds per encounter.
  • The delay effect is more pronounced in smaller diameter axons.
  • Accumulated delays over millimeter-long axons are in the range of neuronal temporal precision.
  • Mitochondria induce conduction inhomogeneities along the axon.

Conclusions:

  • Mitochondria partially occupying axoplasm constrain information processing in vertebrate small-diameter axons.
  • Axonal mitochondria introduce delays that impact neuronal temporal coding.
  • The developed model allows future studies on mitochondrial plasticity's effect on axonal function.