Replicative Senescence

Definition

Replicative senescence is a state of stable cell-cycle arrest that occurs after many normal cells have divided a limited number of times. It is closely linked to progressive telomere shortening, which can eventually trigger a DNA-damage response and prevent further cell division. [1] [2] [3]

Why It Matters in Ageing Research

Replicative senescence matters because it connects cell division history, telomere biology, tumour suppression, tissue renewal, and age-related loss of regenerative capacity. Senescent cells can stop damaged or overly proliferative cells from dividing, but persistent senescent cells may also contribute to inflammation and tissue dysfunction through altered secretory signalling. Replicative senescence is therefore one important form of cellular senescence, not the whole ageing process. [4] [5] [6]

Common Confusion

• Replicative senescence is not the same as all cellular senescence; other stress signals can also induce senescence.
• Replicative senescence is not simply cell death; senescent cells are usually alive but no longer divide.
• Telomere shortening is central to replicative senescence, but senescence markers and outcomes vary by cell type and context.

Related Reading

• Cellular Senescence
• Hayflick Limit
• Telomeres
• Telomerase

References

1. Hayflick, L., & Moorhead, P. S. (1961). The serial cultivation of human diploid cell strains. https://doi.org/10.1016/0014-4827(61)90192-6
2. Harley, C. B., Futcher, A. B., & Greider, C. W. (1990). Telomeres shorten during ageing of human fibroblasts. https://doi.org/10.1038/345458a0
3. d'Adda di Fagagna, F., et al. (2003). A DNA damage checkpoint response in telomere-initiated senescence. https://doi.org/10.1038/nature02118
4. Campisi, J., & d'Adda di Fagagna, F. (2007). Cellular senescence: when bad things happen to good cells. https://doi.org/10.1038/nrm2233
5. Campisi, J. (2013). Aging, Cellular Senescence, and Cancer. https://doi.org/10.1146/annurev-physiol-030212-183653
6. Lopez-Otin, C., et al. (2013). The Hallmarks of Aging. https://doi.org/10.1016/j.cell.2013.05.039