AMPK

Definition

AMPK, or AMP-activated protein kinase, is a conserved cellular energy sensor that helps cells respond when energy availability is low. It is activated by changes in cellular energy state and shifts cell behaviour toward energy-producing processes while restraining energy-consuming processes such as lipid, protein, and nucleotide synthesis. [1] [2] [3]

Why It Matters in Ageing Research

AMPK matters in ageing research because it connects nutrient sensing, mitochondrial function, autophagy, inflammation, and metabolic stress responses. It interacts with other longevity-relevant pathways, including mTOR, insulin/IGF-1 signalling, and sirtuin biology, making it an important node in studies of caloric restriction, exercise, metabolic disease, and geroprotective interventions. [4] [5] [6]

Common Confusion

• AMPK is not a supplement or drug; it is a protein kinase pathway inside cells.
• AMPK activation is not always beneficial in every context, because its effects depend on tissue, timing, dose, and disease state.
• AMPK is related to mTOR and autophagy, but it is not the same pathway as either of them.

Related Reading

• Hallmarks of Ageing
• mTOR
• Autophagy
• Macroautophagy
• Mitochondrial Dysfunction

References

1. Hardie, D. G., Ross, F. A., & Hawley, S. A. (2012). AMPK: a nutrient and energy sensor that maintains energy homeostasis. https://doi.org/10.1038/nrm3311
2. Hardie, D. G. (2011). AMP-activated protein kinase: an energy sensor that regulates all aspects of cell function. https://doi.org/10.1101/gad.17420111
3. Carling, D. (2017). AMPK signalling in health and disease. https://doi.org/10.1016/j.cub.2017.05.074
4. Lopez-Otin, C., et al. (2013). The Hallmarks of Aging. https://doi.org/10.1016/j.cell.2013.05.039
5. Lopez-Otin, C., et al. (2023). Hallmarks of aging: An expanding universe. https://doi.org/10.1016/j.cell.2022.11.001
6. Salminen, A., & Kaarniranta, K. (2012). AMP-activated protein kinase (AMPK) controls the aging process via an integrated signaling network. https://doi.org/10.1016/j.arr.2011.12.005