Cellular Ageing & Senescence: The Biological Clock Inside…

What Cellular Ageing Is

Cellular ageing refers to the gradual loss of function in cells over time. This process is characterized by telomere shortening, accumulation of oxidative damage, and changes in gene expression that lead to cellular dysfunction.

Senescence is a state where cells lose their ability to divide and often secrete factors that affect neighboring cells, contributing to tissue degeneration and age-related diseases.

The Hallmarks of Cellular Ageing

Telomere attrition, the progressive shortening of telomeres at the ends of chromosomes, is a hallmark that limits cell division. Oxidative stress, caused by an imbalance between free radicals and antioxidants, leads to DNA damage and protein dysfunction.

Genomic instability, another hallmark, results from errors in DNA replication and repair mechanisms, leading to mutations and chromosomal abnormalities. Epigenetic alterations involve changes in gene expression without altering the DNA sequence, often resulting in altered cell behavior.

live demo · related simulation● LIVE

Mechanisms of Senescence

Senescent cells cease to divide but remain metabolically active and can secrete pro-inflammatory cytokines, growth factors, and matrix metalloproteinases. This phenomenon, known as the senescence-associated secretory phenotype (SASP), contributes to tissue dysfunction and inflammation.

The accumulation of senescent cells in tissues is a hallmark that drives age-related diseases such as osteoarthritis, cardiovascular disease, and cancer.

Interventions Against Ageing

Calorie restriction and rapamycin treatment can slow down cellular ageing by reducing oxidative stress and promoting autophagy. Rapamycin also extends lifespan in various organisms by inhibiting the mTOR pathway, which is involved in cell growth and survival.

Senolytics are drugs designed to selectively eliminate senescent cells, thereby improving tissue function and potentially extending healthy lifespan.

Frequently asked questions

What causes telomere shortening?

Telomeres shorten with each cell division due to the end-replication problem during DNA replication. This process is exacerbated by oxidative stress and other forms of cellular damage.

How do senolytics work?

Senolytics target and eliminate senescent cells by inducing apoptosis or necrosis, thereby reducing their harmful effects on surrounding tissues and potentially improving overall health.

Can cellular ageing be reversed?

While complete reversal of cellular ageing is not yet possible, interventions like caloric restriction and rapamycin can slow down the process and improve cell function.

Are there any natural ways to prevent senescence?

Healthy lifestyle choices such as regular exercise, a balanced diet rich in antioxidants, and stress management can help mitigate some aspects of cellular ageing.

Try it live

Everything above runs in your browser — open Cellular Ageing & Senescence and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Cellular Ageing & Senescence simulation

Cellular Ageing & Senescence: The Biological Clock Inside Us