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Related Concept Videos

Replicative Cell Senescence02:15

Replicative Cell Senescence

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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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Aging01:26

Aging

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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.
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...
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The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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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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Menopause01:28

Menopause

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Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
5.0K
Unrenewable Cells00:50

Unrenewable Cells

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In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of...
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Bone Disorders01:29

Bone Disorders

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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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Related Experiment Video

Updated: Feb 25, 2026

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence
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A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence

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Senescence in the aging process.

Richard Ga Faragher1, Anne McArdle2, Alison Willows1

  • 1Stress, Ageing and Disease Research Group, School of Pharmacy & Biomolecular Sciences, University of Brighton, Brighton, East Sussex, UK.

F1000Research
|August 8, 2017
PubMed
Summary
This summary is machine-generated.

Cellular senescence, a key aging mechanism, involves cells with altered gene expression and degenerative traits. Research confirms senescent cells drive aging, with future work focusing on individual variation and mitigating their harmful effects.

Keywords:
agingfibroblastlifespansenescenttelomere

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Last Updated: Feb 25, 2026

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence
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Induction and Validation of Cellular Senescence in Primary Human Cells
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Area of Science:

  • Gerontology and Cellular Biology
  • Molecular Mechanisms of Aging

Background:

  • Cellular senescence is implicated as a fundamental aging mechanism.
  • Senescent cells exhibit distinct transcriptomic and phenotypic changes compared to proliferating cells.

Purpose of the Study:

  • To summarize recent advancements in understanding senescence.
  • To highlight current challenges in senescence research, including inter-individual variability and therapeutic development.

Main Methods:

  • Review of molecular mechanisms controlling entry into senescence.
  • Analysis of evidence demonstrating senescent cells as causal agents of aging.

Main Results:

  • Significant progress in understanding senescence initiation.
  • Direct evidence linking senescent cells to mammalian aging processes.

Conclusions:

  • Senescent cells are confirmed causal agents of aging.
  • Future research directions include understanding phenotypic variation, linking senescence to frailty, and developing interventions to counteract detrimental effects.