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Related Concept Videos

Aging01:26

Aging

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.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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...
Mitochondria01:37

Mitochondria

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,...
Replicative Cell Senescence02:15

Replicative Cell Senescence

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 the telomeric...
Replicative Cell Senescence02:15

Replicative Cell Senescence

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 the telomeric...
Cellular Adaptation I: Introduction and Atrophy01:23

Cellular Adaptation I: Introduction and Atrophy

Cells can adapt to environmental changes to maintain function and avoid injury, a process called cellular adaptation. Adapted cells exist in a reversible intermediate state with changes in size, number, phenotype, metabolism, or function. These responses help cells meet altered physiological or pathological demands; for example, enlargement of breast and uterine tissues during pregnancy. Early adaptations may enhance function, but persistent stress eventually causes tissue damage.Types of...

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Related Experiment Video

Updated: Jun 4, 2026

Induction and Validation of Cellular Senescence in Primary Human Cells
08:18

Induction and Validation of Cellular Senescence in Primary Human Cells

Published on: June 20, 2018

The cellular basis of aging.

S Goldstein

    Canadian Family Physician Medecin De Famille Canadien
    |February 1, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Biological aging is linked to cellular division limits and DNA changes, impacting health and disease risk. Understanding these molecular processes can promote longevity and improve elderly quality of life.

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    Area of Science:

    • Gerontology
    • Cellular Biology
    • Molecular Biology

    Background:

    • Biological aging is characterized by physiological decline and increased pathology.
    • Cellular and molecular mechanisms underlying aging are becoming clearer.
    • Studies suggest a cellular 'clock' limits cell division.

    Purpose of the Study:

    • To explore the cellular and molecular basis of biological aging.
    • To understand the implications of replicative exhaustion and DNA changes in aging.
    • To identify how aging research can inform medical practice for longevity.

    Main Methods:

    • In vitro studies on human cells.
    • Analysis of cellular replicative capacity.
    • Investigation of DNA rearrangements in aging cells.

    Main Results:

    • Human cells have a maximum limit on divisions (replicative clock).
    • Chronic trauma can accelerate cell turnover, leading to replicative exhaustion.
    • DNA rearrangements are observed in aging cells, potentially reducing replicative capacity.

    Conclusions:

    • Cellular replicative exhaustion and DNA changes contribute to physiological decline and age-related diseases.
    • Research into aging mechanisms can guide interventions for healthier aging.
    • Application of this knowledge may enhance longevity and quality of life for the elderly.