Mitochondrial Dysfunction
Definition
Mitochondrial dysfunction refers to impaired mitochondrial performance, including reduced energy production, poorer quality control, and altered signaling. Because mitochondria help generate ATP and coordinate stress responses, dysfunction can affect how well cells meet energy demands and maintain normal function. [1] [2]
Why It Matters in Ageing Research
Mitochondrial dysfunction matters because high-energy tissues such as muscle, heart, and brain depend heavily on mitochondrial function. In ageing research, impaired mitochondrial quality is often linked to reduced resilience, altered metabolism, and other hallmarks of ageing, which is why mitochondria are treated as a central part of ageing biology. [1] [7] [8]
Common Confusion
- Mitochondrial dysfunction is not just a simple “low energy” problem.
- It does not mean reactive oxygen species are always purely harmful in every context.
- Mitochondrial changes are important in ageing, but they are not the only ageing mechanism.
Related Reading
References
- Lopez-Otin, C., et al. (2013). The hallmarks of aging. https://doi.org/10.1016/j.cell.2013.05.039
- Wallace, D. C. (2005). A mitochondrial paradigm of metabolic and degenerative diseases, aging, and cancer. https://doi.org/10.1146/annurev.genet.39.110304.095751
- Bratic, A., & Larsson, N. G. (2013). The role of mitochondria in aging. https://doi.org/10.1172/JCI64125
- West, A. P., et al. (2015). Mitochondrial DNA in innate immune responses and inflammatory diseases. https://doi.org/10.1038/nri3864
This glossary entry is provided for educational purposes only and does not constitute medical advice.