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Cellular Injury I: Introduction01:00

Cellular Injury I: Introduction

Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Replicative Cell Senescence02:15

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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 the telomeric...
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Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
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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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Methods of cellular senescence induction using oxidative stress.

Zhe Wang1, Dandan Wei, Hengyi Xiao

  • 1Department of Geriatrics, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, People's Republic of China.

Methods in Molecular Biology (Clifton, N.J.)
|August 10, 2013
PubMed
Summary

Cellular senescence is a natural process where cells stop dividing. This study focuses on stress-induced premature senescence (SIPS) using hydrogen peroxide (H2O2) as a common inducer in human fibroblast models.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Gerontology

Background:

  • Normal somatic cells possess a finite replicative lifespan, leading to cell division arrest known as senescence.
  • Human diploid fibroblasts are a standard in vitro model for investigating cellular senescence.
  • Oxidative stress can induce premature cellular senescence, termed stress-induced premature senescence (SIPS).

Purpose of the Study:

  • To summarize fundamental knowledge and experimental approaches for inducing SIPS.
  • To focus on hydrogen peroxide (H2O2) as a prevalent SIPS inducer.
  • To introduce common assays for detecting cellular senescence.

Main Methods:

  • Utilizing human diploid fibroblasts as an in vitro model.
  • Employing hydrogen peroxide (H2O2) to induce stress-induced premature senescence (SIPS).
  • Reviewing established assays for senescence detection.

Main Results:

  • Hydrogen peroxide (H2O2) is a widely used and effective inducer of SIPS in vitro.
  • Various oxidative stress agents can trigger premature senescence.
  • Standardized methods exist for inducing and detecting SIPS.

Conclusions:

  • Hydrogen peroxide (H2O2) is a key tool for studying SIPS in vitro.
  • Understanding SIPS induction is crucial for cellular aging research.
  • Standardized assays facilitate reliable senescence assessment.