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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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Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.
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Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across the cell membrane. In order to be able to affect a cell without entering it, these hormones bind to receptors on the cell membrane. When a first messenger, a hormone, binds to a receptor, a signal cascade is set off, causing second messengers, proteins inside the cell, to become activated, resulting in downstream effects.
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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate with the environment.
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Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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Related Experiment Video

Updated: Feb 4, 2026

Far-Red Fluorescent Senescence-Associated β-Galactosidase Probe for Identification and Enrichment of Senescent Tumor Cells by Flow Cytometry
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Far-Red Fluorescent Senescence-Associated β-Galactosidase Probe for Identification and Enrichment of Senescent Tumor Cells by Flow Cytometry

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Senescent Cells Drive Frailty through Systemic Signals.

Johannes Lehmann1, Marjolein P Baar1, Peter L J de Keizer1

  • 1Center for Molecular Medicine, University Medical Center Utrecht, Universiteitsweg 100, 3584CG Utrecht, The Netherlands.

Trends in Molecular Medicine
|October 8, 2018
PubMed
Summary

Senescent cells contribute to aging and reduced lifespan. Injecting these cells into young mice led to lasting increases in frailty and mortality, suggesting systemic signaling plays a key role.

Keywords:
SASPageingcellular senescencefrailtyparacrinesystemic

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Frailty Assessment in an Aging Mouse Model
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Area of Science:

  • Gerontology
  • Cellular senescence
  • Systemic aging mechanisms

Background:

  • Cellular senescence is a known driver of aging and age-related health decline.
  • The role of systemic signaling in mediating these effects has been an open question in aging research.

Purpose of the Study:

  • To investigate whether systemic signaling from senescent cells contributes to aging phenotypes.
  • To determine the impact of senescent cell burden on healthspan and lifespan.

Main Methods:

  • Senescent cells were experimentally introduced into young, healthy mice.
  • Mice were monitored for long-term changes in physical frailty and overall survival.

Main Results:

  • The injection of senescent cells resulted in a sustained increase in frailty.
  • A significant and long-lasting increase in mortality was observed in the treated mice.

Conclusions:

  • Systemic signaling from senescent cells can induce aging phenotypes.
  • Cellular senescence represents a critical, targetable mechanism contributing to age-related decline and reduced lifespan.