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Acetaminophen Hepatotoxicity.

Anup Ramachandran1, Hartmut Jaeschke1

  • 1Department of Pharmacology, Toxicology and Therapeutics, University of Kansas Medical Center, Kansas City, Kansas.

Seminars in Liver Disease
|March 9, 2019
PubMed
Summary
This summary is machine-generated.

Acetaminophen (APAP) overdose causes liver injury through reactive metabolites and mitochondrial damage. New insights reveal cell death pathways and inflammatory responses, aiding the development of novel therapeutic interventions for APAP toxicity.

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Area of Science:

  • Hepatology
  • Toxicology
  • Cellular Biology

Background:

  • Acetaminophen (APAP) is a widely used analgesic, frequently involved in overdoses leading to severe liver injury and acute liver failure (ALF).
  • APAP toxicity accounts for a significant portion of ALF cases in the United States, highlighting its public health relevance.

Purpose of the Study:

  • To elucidate the detailed intracellular mechanisms of APAP-induced cell death and the subsequent inflammatory response.
  • To discuss the translational relevance of these findings in humans and explore emerging therapeutic strategies.

Main Methods:

  • Review of mechanistic studies on APAP toxicity, including those involving reactive metabolites, mitochondrial dysfunction, and signaling pathways.
  • Examination of findings in human hepatocytes and plasma biomarkers from APAP overdose patients.
  • Analysis of the role of autophagy, mitochondrial biogenesis, and inflammatory cell recruitment in APAP-induced liver injury.

Main Results:

  • APAP overdose induces liver injury via reactive metabolites, leading to glutathione depletion and mitochondrial oxidant stress.
  • Mitochondrial damage triggers a MAPK cascade, activating JNK, mitochondrial dysfunction, and DNA fragmentation.
  • Inflammatory responses, while aiding debris removal, can exacerbate APAP-induced liver injury.

Conclusions:

  • Detailed understanding of APAP toxicity mechanisms, including mitochondrial pathways and inflammatory responses, is crucial.
  • Translational studies in human models confirm these mechanisms and support the development of new therapeutic interventions for APAP overdose.