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Published on: May 31, 2018
Acetaminophen protein adducts: a review.
1Drug and Poison Information Center, Cincinnati Children's Hospital, Cincinnati, Ohio 45229, USA. randy.bond@chmcc.org
Current tests for 3-para cysteinyl acetaminophen, a byproduct of acetaminophen, lack sufficient evidence to prove its direct link to liver injury. These assays also do not clearly guide treatment over existing methods.
Area of Science:
- Toxicology
- Hepatology
- Biomarker Development
Background:
- Acetaminophen (APAP) overdose is a leading cause of acute liver failure.
- 3-para cysteinyl acetaminophen (3-PAA) is a protein adduct and degradation product of APAP.
- The clinical and legal significance of 3-PAA as a biomarker for APAP-induced liver injury (AP-ALI) is debated.
Purpose of the Study:
- To review the nature of 3-PAA and its detection assays.
- To evaluate animal and human research linking 3-PAA to AP-ALI.
- To assess the causality and clinical utility of 3-PAA assays in managing APAP toxicity.
Main Methods:
- Literature review of animal and human studies on 3-PAA.
- Analysis of evidence for causal association between 3-PAA and AP-ALI.
- Evaluation of the utility of quantitative 3-PAA assays in guiding APAP overdose management.
Main Results:
- Inadequate evidence exists to support 3-PAA assays alone proving causality in AP-ALI.
- Quantitative 3-PAA assay results parallel other liver injury markers.
- 3-PAA assays have not demonstrated superiority over existing risk stratification tools like the Rumack-Matthew nomogram.
Conclusions:
- Current evidence is insufficient to establish 3-PAA as a definitive biomarker for AP-ALI causality.
- The clinical utility of 3-PAA assays in guiding APAP overdose therapy remains unproven.
- Further research is needed to demonstrate the added value of 3-PAA assays over established clinical practices.
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