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Related Concept Videos

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Related Experiment Video

Updated: Oct 10, 2025

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Presynaptic Mitochondrial Volume and Packing Density Scale with Presynaptic Power Demand.

Karlis A Justs1,2, Zhongmin Lu1,2, Amit K Chouhan3

  • 1Integrative Biology and Neuroscience Graduate Program, Florida Atlantic University, Jupiter, Florida 33458.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 15, 2021
PubMed
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Neurons optimize their energy production by adjusting mitochondrial volume and density to meet high power demands. This study quantifies presynaptic bioenergetics, revealing oxidative phosphorylation

Keywords:
calciumelectron microscopyenergymitochondriaoxidativepresynaptic

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Bioenergetics

Background:

  • Stable neural function necessitates energy supply matching neuronal activity demands.
  • The relationship between presynaptic power needs and bioenergetic machinery volume remains unquantified.
  • Understanding neuronal energy metabolism is crucial for comprehending neural processing limitations.

Purpose of the Study:

  • To quantify the power demands of motor nerve terminals in *Drosophila* larvae.
  • To investigate the relationship between presynaptic power demands and the volume of bioenergetic machinery (mitochondria and cytosol).
  • To estimate ATP production rates from glycolysis and oxidative phosphorylation in presynaptic terminals.

Main Methods:

  • Direct measurement of neurotransmitter release and Ca2+ entry in *Drosophila* motor nerve terminals.
  • Theoretical estimation of Na+ entry and resting power demands.
  • Electron microscopy to determine mitochondrial volume and density.

Main Results:

  • Terminals with higher power demands exhibited greater mitochondrial volume, indicating allocation based on energy needs.
  • High power demand-to-volume ratio terminals possessed larger, denser mitochondria.
  • Estimated ATP production rates: mitochondria supply 52–963 nmol·min−1·µl−1, glycolysis 0.24–4.36 nmol·min−1·µl−1 at rest and during activity, respectively.

Conclusions:

  • Presynaptic terminals optimize mitochondrial volume and density to meet power demands over time.
  • Oxidative phosphorylation plays a primary role in presynaptic energy production.
  • Provides the first in vivo estimates of energy production rates per unit volume of presynaptic mitochondria and cytosol.