Abstract
Introduction
Acetaminophen (APAP) toxicity remains a significant cause of adult and pediatric liver failure in North America and Europe. Previous research has evaluated the impaired mitochondrial function associated with APAP toxicity. The primary aim of this study was to evaluate the effects of APAP toxicity on platelet mitochondrial function using platelet oxygen consumption in a murine model in vivo. Our secondary objectives were to determine the effect of 4-MP on platelet mitochondrial function and hepatic toxicity in the setting of APAP overdose, and to correlate platelet mitochondrial function with other markers of APAP toxicity.
Methods
Male C57Bl/6 mice were randomized to receive APAP (300 or 500 mg/kg) or vehicle followed 90 minutes later by either 4-MP (50 mg/kg) or vehicle via intraperitoneal injection. Mice were euthanized 0, 12, or 24 hours later and platelets isolated from cardiac blood and counted. Platelet oxygen consumption (POC) was determined using a closed-system respirometer. Liver injury was assessed by measuring alanine transferase (ALT) and histological evaluation.
Results
Injection of 500 mg/kg APAP led to increased POC versus pair-matched control (vehicle) (p < 0.001). Administration of 4-MP did not affect POC in control or 300 mg/kg APAP mice. In mice receiving 500 mg/kg APAP and 4-MP, POC decreased significantly compared to mice receiving 500 mg/kg APAP alone (p < 0.01). Serum and histological analysis confirmed APAP-induced hepatic damage in mice receiving 500 mg/kg APAP and these effects blunted by treatment with 4-MP.
Conclusions
Platelet oxygen consumption as a measure of mitochondrial function may be useful as a biomarker of hepatic APAP toxicity in the setting of moderate to severe overdose. Treatment with 4-MP decreases hepatic necrosis and may mitigate the harmful effects of APAP on platelet mitochondrial function detected via POC.
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Funding
2020 Medical Toxicology Foundation (MTF) Innovative Research and Teaching Award.
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All authors contributed to the study's conception and design. Material preparation was performed by Carolyn Fox, Christine Murphy, and Michael Ekaney. Data collection was performed by Carolyn Fox, Christine Murphy, Michael Ekaney, and Iain McKillop. Data analysis was performed by all authors. Philip Turk and Hieu Nguyen performed the POC analysis, while the other analysis was performed by the remaining authors. All authors contributed to the original draft of the manuscript, and all authors participated in review and editing of the manuscript. All authors read and approved the final manuscript.
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Previous Presentation: Data in this study were previously presented at the American College of Medical Toxicology (ACMT) Annual Scientific Meeting, April 2021.
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Fox, C., Ekaney, M.L., Runyon, M. et al. Assessing Platelet Mitochondrial Dysfunction in a Murine Model of Acute Acetaminophen Toxicity. J. Med. Toxicol. 19, 341–351 (2023). https://doi.org/10.1007/s13181-023-00964-0
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DOI: https://doi.org/10.1007/s13181-023-00964-0