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The role of apoptosis in acetaminophen-induced injury

George E N Kass1, Patricia Macanas-Pirard, Pauline C Lee

  • 1School of Biomedical and Life Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom. g.kass@surrey.ac.uk

Annals of the New York Academy of Sciences
|March 23, 2004
PubMed

Insights

Acetaminophen (AAP) causes liver injury by inducing apoptosis, a programmed cell death. This study reveals AAP triggers apoptosis in human liver cells via mitochondrial cytochrome c release and caspase activation.

Area of Science:

  • Hepatology
  • Cell Biology
  • Toxicology

Background:

  • Acetaminophen (AAP) overdose is a leading cause of acute liver failure.
  • Apoptosis, or programmed cell death, is a key mechanism in AAP-induced liver injury.
  • Inhibiting apoptosis can prevent acute liver failure following AAP exposure.

Purpose of the Study:

  • To investigate the specific mechanisms by which AAP induces apoptosis in human liver cells.
  • To elucidate the role of caspases and mitochondrial pathways in AAP-induced hepatotoxicity.

Main Methods:

  • Utilized the human hepatoblastoma cell line HuH7 for in vitro studies.
  • Assessed cytotoxicity, caspase activation, cytokeratin-18 cleavage, and cytochrome c translocation.
  • Examined the cellular response to acetaminophen exposure.

Main Results:

  • Acetaminophen induced significant cytotoxicity in HuH7 cells, consistent with apoptosis.
  • Evidence of execution caspase processing and cytokeratin-18 cleavage confirmed caspase involvement.
  • Mitochondrial cytochrome c translocation to the cytosol preceded the observable apoptotic events.

Conclusions:

  • Acetaminophen triggers apoptosis in human hepatoblastoma cells.
  • The mechanism involves the release of mitochondrial cytochrome c.
  • Caspase activation plays a crucial role in acetaminophen-induced liver cell death.

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