Abstract
We previously reported that delayed treatment with Mito-tempo (MT), a mitochondria-targeted superoxide dismutase mimetic, protects against the early phase of acetaminophen (APAP) hepatotoxicity by inhibiting peroxynitrite formation. However, whether this protection is sustained to the late phase of toxicity is unknown. To investigate the late protection, C57Bl/6J mice were treated with 300 mg/kg APAP followed by 20 mg/kg MT 1.5 h or 3 h later. We found that both MT treatments protected against the late phase of APAP hepatotoxicity at 12 and 24 h. Surprisingly, MT-treated mice demonstrated a significant increase in apoptotic hepatocytes, while the necrotic phenotype was observed almost exclusively in mice treated with APAP alone. In addition, there was a significant increase in caspase-3 activity and cleavage in the livers of MT-treated mice. Immunostaining for active caspase-3 revealed that the positively stained hepatocytes were exclusively in centrilobular areas. Treatment with the pan-caspase inhibitor ZVD-fmk (10 mg/kg) 2 h post-APAP neutralized this caspase activation and provided additional protection against APAP hepatotoxicity. Treatment with N-acetylcysteine, the current standard of care for APAP poisoning, protected but did not induce this apoptotic phenotype. Mechanistically, MT treatment inhibited APAP-induced RIP3 kinase expression, and RIP3-deficient mice showed caspase activation and apoptotic morphology in hepatocytes analogous to MT treatment. These data suggest that while necrosis is the primary cause of cell death after APAP hepatotoxicity, treatment with the antioxidant MT may switch the mode of cell death to secondary apoptosis in some cells. Modulation of mitochondrial oxidative stress and RIP3 kinase expression play critical roles in this switch.
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Abbreviations
- ALT:
-
Alanine aminotransferase
- APAP:
-
Acetaminophen
- CYP:
-
Cytochrome P450
- Gal:
-
d-Galactosamine
- GSH:
-
Glutathione
- GSSG:
-
Glutathione disulfide
- ET:
-
Endotoxin (lipopolysaccharide)
- MPT:
-
Mitochondrial permeability transition
- MT:
-
Mito-Tempo
- NAC:
-
N-Acetylcysteine
- NAPQI:
-
N-Acetyl-p-benzoquinone imine
- ROS:
-
Reactive oxygen species
- RFU:
-
Relative fluorescence units
- TUNEL:
-
Terminal deoxynucleotidyl transferase dUTP nick end labeling
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Acknowledgements
This investigation was supported in part by the National Institutes of Health grant R01 DK102142 and by grants from the National Institute of General Medical Sciences (P20 GM103549 and P30 GM118247) from the National Institutes of Health. Additional support came as an award from the Biomedical Research Training Program (BRTP) from the University of Kansas Medical Center (to K.D.).
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Du, K., Ramachandran, A., Weemhoff, J.L. et al. Mito-tempo protects against acute liver injury but induces limited secondary apoptosis during the late phase of acetaminophen hepatotoxicity. Arch Toxicol 93, 163–178 (2019). https://doi.org/10.1007/s00204-018-2331-8
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DOI: https://doi.org/10.1007/s00204-018-2331-8