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Exercise training and changes in skeletal muscle mitochondrial proteins: from blots to "omics"
Elizabeth G Reisman1,2, Nikeisha J Caruana1,3, David J Bishop1
1Institute for Health and Sport (IHES), Victoria University, Melbourne, Australia.
Critical Reviews in Biochemistry and Molecular Biology
|September 17, 2024
Summary
Exercise training increases mitochondrial proteins in skeletal muscle. However, studies show little overlap, indicating a need for more reliable methods to understand mitochondrial adaptation and metabolism.
Area of Science:
- Exercise physiology
- Mitochondrial biology
- Proteomics
Background:
- Mitochondria are vital organelles with over 1100 proteins, crucial for metabolism.
- Skeletal muscle, a highly metabolic tissue, increases mitochondrial content with exercise.
- Current research using western blot and proteomics identifies training-induced mitochondrial protein changes, but with limited consistency.
Purpose of the Study:
- To highlight the inconsistencies in identifying exercise-responsive mitochondrial proteins across human training studies.
- To emphasize the need for improved methodologies in mitochondrial research.
Main Methods:
- Review of published human exercise training studies focusing on mitochondrial protein analysis.
- Comparison of protein identification and overlap across different proteomic and western blot approaches.
Main Results:
- Western blotting reveals training-induced changes in a small subset of known mitochondrial proteins.
- Proteomic studies identify hundreds of additional exercise-responsive mitochondrial proteins.
- Significant lack of overlap in identified mitochondrial proteins between published human training studies.
Conclusions:
- Current methods for studying exercise-induced mitochondrial adaptations lack reproducibility.
- Future research requires enhanced reliability in detecting changes in mitochondrial protein abundance to link them to metabolic function.
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