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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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Area of Science:

  • Cellular Biology
  • Aging Research
  • Immunology

Background:

  • Cellular senescence is a permanent cell cycle arrest and stress response.
  • Senescent cells accumulate with age in mammalian tissues and are implicated in age-related diseases like COPD and emphysema.
  • The senescence response has dual roles: tumor suppression but also impaired tissue repair and chronic inflammation.

Purpose of the Study:

  • To review the dual role of cellular senescence in health and disease.
  • To discuss the implications of senescent cell accumulation in age-related pathologies.
  • To highlight emerging strategies for targeting senescent cells.

Main Methods:

  • Literature review of cellular senescence.
  • Analysis of senescent cell accumulation in aging and disease models.
  • Evaluation of interventions targeting senescent cells.

Main Results:

  • Senescent cells contribute to age-related diseases through chronic inflammation and impaired regeneration.
  • Senescent cell clearance in mouse models improves health span and median lifespan.
  • Targeting senescent cells presents a potential therapeutic strategy for age-related conditions.

Conclusions:

  • Cellular senescence is a critical factor in aging and age-related diseases.
  • Targeting senescent cells offers a promising avenue for therapeutic intervention.
  • Future research should focus on developing interventions that selectively modulate senescent cell effects.