The Multifaceted Inducers Of Cellular Senescence

Cellular senescence, a state where cells permanently stop dividing, is triggered by a variety of internal and external factors and plays a dual role in health, contributing to both beneficial processes like tumor suppression and harmful effects like aging and disease when cells accumulate.

Our bodies are made of cells that constantly divide and replace themselves. However, sometimes cells enter a state called ‘cellular senescence,’ where they stop dividing permanently but remain active. This isn’t always a bad thing; for instance, it helps prevent cancer by stopping damaged cells from multiplying, aids in wound healing, and is important for development.

But what causes cells to enter this senescent state? It turns out there’s a wide range of triggers. These include damage to a cell’s genetic material (DNA damage), stress from harmful molecules called ‘free radicals’ (oxidative stress), problems with the cell’s energy factories (mitochondrial stress), and the natural shortening of protective caps on chromosomes called ‘telomeres’ that happens with age. Other triggers can be the activation of genes that promote uncontrolled growth (oncogene activation), or even signals from other senescent cells.

While these triggers are diverse, they often lead to similar internal changes that halt cell division. The downside is that when these non-dividing cells accumulate over time, they can contribute to tissue problems, ongoing inflammation, and various age-related diseases. Understanding these many ways cells become senescent is key to developing new strategies to combat aging and related health issues.

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Source: link to paper