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Related Concept Videos

Overview of Cell Death01:30

Overview of Cell Death

Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the 20th century...
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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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Mitochondria

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Related Experiment Video

Updated: May 29, 2026

Techniques to Induce and Quantify Cellular Senescence
06:51

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Published on: May 1, 2017

Hormesis, cell death and aging.

Isabelle Martins1, Lorenzo Galluzzi, Guido Kroemer

  • 1INSERM, U848, 94805 Villejuif, France.

Aging
|September 21, 2011
PubMed
Summary

Low doses of toxins can trigger adaptive stress responses, a phenomenon called hormesis, enhancing resistance to higher doses. This adaptive response, exemplified by ischemic preconditioning, also involves autophagy, a cellular cleanup process that may prolong lifespan.

Area of Science:

  • Cellular Stress Response
  • Molecular Biology
  • Aging Research

Background:

  • Low-dose toxins can induce adaptive stress responses, enhancing organismal resistance to subsequent high doses, a phenomenon termed hormesis.
  • Ischemic preconditioning, where brief oxygen deprivation protects tissues, exemplifies hormesis.
  • Certain molecules induce both cell death and autophagy, a cytoprotective process involving the degradation of cellular components like mitochondria.

Purpose of the Study:

  • To explore the phenomenon of hormesis and its underlying mechanisms.
  • To investigate the role of autophagy in hormesis and its potential impact on lifespan.
  • To connect the effects of low-dose cytotoxic agents to hormesis and lifespan extension.

Main Methods:

  • Review of existing literature on hormesis, ischemic preconditioning, and autophagy.

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  • Analysis of molecular pathways involved in cellular stress responses.
  • Examination of studies on autophagy inducers like resveratrol and caloric restriction.

    • Main Results:

    • Hormesis, triggered by low-dose stressors, enhances resistance to high doses of the same agent.
    • Autophagy, a cellular defense mechanism, is activated by molecules that can also cause cell death at high doses.
    • Low doses of cytotoxic agents can induce hormesis, potentially explaining lifespan extension by autophagy inducers.

    Conclusions:

    • Hormesis is a key adaptive response where low-dose stressors increase resistance to high doses.
    • Autophagy plays a crucial cytoprotective role, particularly in response to cellular damage.
    • The hormetic effects of low-dose cytotoxic agents, mediated by autophagy, may contribute to lifespan extension.