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Definition: When does cellular senescence occur in the body?

Cellular senescence refers to the state in which cells lose their ability to divide and replicate. It is a natural process that occurs as a result of various factors, including aging, DNA damage, telomere shortening, and exposure to stressors.

Causes of Cellular Senescence

There are several triggers that can lead to cellular senescence:

• Aging: As individuals age, their cells undergo cumulative damage, leading to senescence.
• DNA Damage: Exposure to environmental factors such as radiation, toxins, and oxidative stress can cause DNA damage, triggering cellular senescence.
• Telomere Shortening: Telomeres, the protective caps at the ends of chromosomes, naturally shorten with each cell division. Once telomeres become critically short, cells enter a state of senescence.
• Stressors: Chronic exposure to stress, both physical and psychological, can accelerate cellular senescence.

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Effects of Cellular Senescence

Cellular senescence plays a crucial role in aging and age-related diseases. While it initially acts as a protective mechanism to prevent damaged cells from becoming cancerous, prolonged senescence can have negative effects:

• Loss of Tissue Function: Senescent cells accumulate in tissues over time, leading to a decline in their overall function.
• Inflammation: Senescent cells release inflammatory molecules, contributing to chronic inflammation, which is associated with various age-related diseases.
• Impaired Regeneration: Senescent cells can impair the regenerative capacity of tissues, hindering their ability to repair and recover.
• Contribution to Aging: Cellular senescence is considered a hallmark of aging, as the accumulation of senescent cells is believed to contribute to the overall aging process.

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Understanding the triggers and effects of cellular senescence is crucial for developing interventions and therapies to promote healthy aging and prevent age-related diseases.

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