Abstract
Background
Acetaminophen (APAP) overdose induces severe oxidative stress followed by hepatocyte apoptosis/necrosis. Previous studies have indicated that endoplasmic reticulum (ER) stress is involved in the cell death process. Therefore, we investigated the effect of the chemical chaperone 4-phenyl butyric acid (PBA) on APAP-induced liver injury in mice.
Methods
Eight-week-old male C57Bl6/J mice were given a single intraperitoneal (i.p.) injection of APAP (450 mg/kg body weight), following which some were repeatedly injected with PBA (120 mg/kg body weight, i.p.) every 3 h starting at 0.5 h after the APAP challenge. All mice were then serially euthanized up to 12 h later.
Results
PBA treatment dramatically ameliorated the massive hepatocyte apoptosis/necrosis that was observed 6 h after APAP administration. PBA also significantly prevented the APAP-induced increases in cleaved activating transcription factor 6 and phosphorylation of c-Jun N-terminal protein kinase and significantly blunted the increases in mRNA levels for binding immunoglobulin protein, spliced X-box binding protein-1, and C/EBP homologous protein. Moreover, PBA significantly prevented APAP-induced Bax translocation to the mitochondria, and the expression of heme oxygenase-1 mRNA and 4-hydroxynonenal. By contrast, PBA did not affect hepatic glutathione depletion following APAP administration, reflecting APAP metabolism.
Conclusions
PBA prevents APAP-induced liver injury even when an APAP challenge precedes its administration. The underlying mechanism of action most likely involves the prevention of ER stress-induced apoptosis/necrosis in the hepatocytes during APAP intoxication.
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Abbreviations
- ALT:
-
Alanine aminotransferase
- AST:
-
Aspartate aminotransferase
- ANOVA:
-
Analysis of variance
- eIF2α:
-
Eukaryotic initiation factor 2α
- ER:
-
Endoplasmic reticulum
- GAPDH:
-
Glyceraldehyde 3-phosphate dehydrogenase
- GRP78:
-
Glucose-regulated protein 78
- Bip:
-
Binding immunoglobulin protein
- H–E:
-
Hematoxylin–Eosin
- 4-HNE:
-
4-hydroxy-2-nonenal
- JNK:
-
c-Jun N-terminal kinase
- HO1:
-
Heme oxygenase-1
- NASH:
-
Non-alcoholic steatohepatitis
- sXBP1:
-
Spliced X-box binding protein-1
- UPR:
-
Unfolded protein response
- NAPQI:
-
N-acetyl-p-benzoquinone imine
- TUNEL:
-
Terminal deoxynucleotidyl transferase-mediated UTP end labeling
- ATF6:
-
Activating transcription factor 6
- IRE1α:
-
Inositol-requiring kinase 1α
- PERK:
-
Protein kinase RNA-like ER kinase
- HSP60:
-
Heat shock protein 60
- CHOP:
-
C/EBP homologous protein
- MPT:
-
Mitochondrial permeability transition
- ROS:
-
Reactive oxygen species
- PBA:
-
4-phenyl butyric acid
- UPR:
-
Unfolded protein response
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Acknowledgments
The authors thank Takako Ikegami and Tomomi Ikeda (Laboratory of Molecular and Biochemical Research, Research Support Center, Juntendo University Graduate School of Medicine, Tokyo, Japan) and Maiko Suzuki and Ryota Kitagawa (Department of Gastroenterology, Juntendo University School of Medicine, Tokyo, Japan) for technical assistance and R. F. Whittier for critical reading of the manuscript and thoughtful discussions.
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This work was supported in part by JSPS KAKENHI (24590995 to K.K., 24590996 to K.I., 24390191 to S.W.).
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Kusama, H., Kon, K., Ikejima, K. et al. Sodium 4-phenylbutyric acid prevents murine acetaminophen hepatotoxicity by minimizing endoplasmic reticulum stress. J Gastroenterol 52, 611–622 (2017). https://doi.org/10.1007/s00535-016-1256-3
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DOI: https://doi.org/10.1007/s00535-016-1256-3