Senescence Surveillance

Definition

Senescence surveillance refers to the immune system's ability to detect, contain, and clear senescent cells. Senescent cells can release signalling molecules through the senescence-associated secretory phenotype, or SASP, which may attract immune cells such as macrophages, natural killer cells, and T cells to remove damaged or potentially harmful cells. [1] [2] [3]

Why It Matters in Ageing Research

Senescence surveillance matters because senescent cells can be beneficial when they support tumour suppression, wound healing, embryonic development, or tissue repair, but harmful when they persist and drive chronic inflammation or tissue dysfunction. Age-related weakening or dysregulation of immune surveillance may allow senescent cells to accumulate, linking cellular senescence with immunosenescence, inflammaging, and age-related disease. [4] [5] [6]

Common Confusion

• Senescence surveillance is not the same as senolytic therapy; it refers to endogenous immune detection and clearance.
• Senescent cells are not always harmful, because short-term senescence can support repair and tumour suppression.
• Failure of senescence surveillance can involve both too little clearance and excessive inflammatory signalling.

Related Reading

• Cellular Senescence
• SASP
• Immunosenescence
• Inflammaging
• Macrophage
• Senolytics

References

1. Krizhanovsky, V., Yon, M., Dickins, R. A., et al. (2008). Senescence of Activated Stellate Cells Limits Liver Fibrosis. https://doi.org/10.1016/j.cell.2008.06.049
2. Xue, W., Zender, L., Miething, C., et al. (2007). Senescence and tumour clearance is triggered by p53 restoration in murine liver carcinomas. https://doi.org/10.1038/nature05529
3. Ovadya, Y., & Krizhanovsky, V. (2014). Senescent cells: SASPected drivers of age-related pathologies. https://doi.org/10.1016/j.bbamcr.2014.10.016
4. Munoz-Espin, D., & Serrano, M. (2014). Cellular senescence: from physiology to pathology. https://doi.org/10.1038/nrm3823
5. Kale, A., Sharma, A., Stolzing, A., Desprez, P. Y., & Campisi, J. (2020). Role of immune cells in the removal of deleterious senescent cells. https://doi.org/10.1111/imr.12820
6. Prata, L. G. P. L., Ovsyannikova, I. G., Tchkonia, T., & Kirkland, J. L. (2018). Senescent cell clearance by the immune system: Emerging therapeutic opportunities. https://doi.org/10.1016/j.semcancer.2018.05.003