Abstract
Induction of osteopontin (OPN), a well-known pro-inflammatory molecule, has been observed in acetaminophen (APAP)-induced hepatotoxicity. However, the precise cell source for OPN induction and its role during APAP-induced hepatotoxicity has not been fully explored. By employing a hepatotoxic mouse model induced by APAP overdose, we demonstrate that both serum and hepatic OPN levels were significantly elevated in response to APAP treatment. Our in vivo and in vitro studies clearly indicated that the induced expression of hepatic OPN was mainly located in necrosis areas and produced by dying or dead hepatocytes. Functional experiments showed that OPN deficiency protected against the APAP-induced liver injury by inhibiting the toxic APAP metabolism via reducing the expression of the cytochrome P450 family 2 subfamily E member 1 (CYP2E1). Interestingly, this inhibition of CYP2E1 expression did not occur in unfasted Opn−/− mice, but was significant in fasted Opn−/− mice and maintained for 2 hours after APAP challenge in fasted Opn−/− mice. In addition, despite the early protective role of OPN deficiency on APAP-induced hepatotoxicity, OPN deficiency retarded injury resolution by sensitizing hepatocytes to apoptosis and impairing liver regeneration. Finally, we demonstrated that a siRNA-mediated transient hepatic Opn knockdown could sufficiently and significantly protect animals from APAP-induced hepatotoxicity and death. In conclusion, this study clearly defines the cell source of OPN induction in response to APAP treatment, provides a novel insight into the metabolic role of OPN to APAP overdose, and suggests an Opn-targeted therapeutic strategy for the treatment or prevention of APAP-induced hepatotoxicity.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (81670562 and 31300742 to X.K., 81670598 to Q.X., 81372233 to H.W., and 81673935 to X.S.) and a grant from the Shanghai Municipal Education Commission (Gaofeng Clinical Medicine Grant Support (20171911) to X.K., National Science and Technology major grant (2017ZX10203204-006-005) to X.K., and the Shanghai Health Bureau Key Joint Efforts Foundation (2013ZYJB001) to Q.X.).
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Wen, Y., Wang, C., Gu, J. et al. Metabolic modulation of acetaminophen-induced hepatotoxicity by osteopontin. Cell Mol Immunol 16, 483–494 (2019). https://doi.org/10.1038/s41423-018-0033-z
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DOI: https://doi.org/10.1038/s41423-018-0033-z
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