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Related Concept Videos

Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...

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Measuring Mitochondrial Electron Transfer Complexes in Previously Frozen Cardiac Tissue from the Offspring of Sow: A Model to Assess Exercise-Induced Mitochondrial Bioenergetics Changes
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Systems modelling of mitochondrial dynamics in different exercise regimes.

Ali Khalilimeybodi1, Lingxia Qiao2, Allen Leung3

  • 1Department of Mechanical and Aerospace Engineering, University of California, San Diego, CA, USA.

The Journal of Physiology
|July 1, 2026
PubMed
Summary

Exercise impacts skeletal muscle mitochondrial dynamics. A computational model shows sprint, resistance, and endurance training trigger distinct fission-fusion patterns, guiding optimized exercise for mitochondrial health.

Keywords:
ROS‐mediated signallingexercise regimemetabolic signallingmitochondrial fissionmitochondrial fusion

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Area of Science:

  • Exercise physiology and molecular biology
  • Skeletal muscle metabolism and mitochondrial dynamics
  • Systems biology and computational modeling

Background:

  • Exercise stimulates skeletal muscle signaling and mitochondrial metabolism.
  • Mitochondrial dynamics, including fission and fusion, are regulated by exercise.
  • Gaps exist in understanding signals driving fission vs. fusion and exercise intensity effects.

Purpose of the Study:

  • To develop an integrative computational framework linking exercise regimens to mitochondrial fission-fusion machinery.
  • To simulate the influence of sprint, resistance, and endurance exercise on mitochondrial dynamics.
  • To identify key signaling pathways and energetic factors regulating mitochondrial remodeling in response to exercise.

Main Methods:

  • Developed a computational framework connecting exercise regimens to muscle energetics and signaling pathways.
  • Simulated the effects of sprint, resistance, and endurance exercise on mitochondrial fission and fusion.
  • Utilized qualitative validation of the signaling network model (80% accuracy) and global sensitivity analysis.

Main Results:

  • The model predicts exercise-induced DRP1-mediated fission followed by MFN1/2-OPA1-mediated re-fusion as energy stress subsides.
  • Endurance exercise showed the most pronounced and sustained changes, sprint showed brief but sharp changes, and resistance showed minimal changes.
  • Identified key regulators: AMPK/PGC-1α for fusion; ROS and AMPK for fission; Ca2+-calmodulin, ERK, and LKB1/AMPK as shared regulators.

Conclusions:

  • The framework unifies muscle signaling logic with energetic states to explain exercise-induced mitochondrial remodeling.
  • Predicts that an endurance base with high-intensity interval training/sprint interval training maximizes mitochondrial fission-fusion.
  • Provides testable predictions for optimizing training regimens to enhance mitochondrial quality and performance.