- •The diurnal variation of acetaminophen induced acute liver injury is dependent on gut microbiota.
- •Gut microbiota derived PPD played the key role in the diurnal variation of acetaminophen induced hepatotoxicity.
- •PPD participated in liver damage development by directly depleting hepatic glutathione levels.
Background & Aims
Acetaminophen (APAP) induced hepatotoxicity is a leading cause of acute liver failure worldwide. It is well established that the liver damage induced by acetaminophen exhibits diurnal variation. However, the detailed mechanism for the hepatotoxic variation is not clear. Herein, we aimed to determine the relative contributions of gut microbiota in modulating the diurnal variation of hepatotoxicity induced by APAP.
Male Balb/C mice were treated with or without antibiotics and a single dose of orally administered APAP (300 mg/kg) at ZT0 (when the light is on-start of resting period) and ZT12 (when the light is off-start of active period).
In agreement with previous findings, hepatic injury was markedly enhanced at ZT12 compared with ZT0. Interestingly, upon antibiotic treatment, ZT12 displayed a protective effect against APAP hepatotoxicity similar to ZT0. Moreover, mice that received the cecal content from ZT12 showed more severe liver damage than mice that received the cecal content from ZT0. 16S sequencing data revealed significant differences in the cecal content between ZT0 and ZT12 in the compositional level. Furthermore, metabolomic analysis showed that the gut microbial metabolites were also different between ZT0 and ZT12. Specifically, the level of 1-phenyl-1,2-propanedione (PPD) was significantly higher at ZT12 than ZT0. Treatment with PPD alone did not cause obvious liver damage. However, PPD synergistically enhanced APAP-induced hepatic injury in vivo and in vitro. Finally, we found Saccharomyces cerevisiae, which could reduce intestinal PPD levels, was able to markedly alleviate APAP-induced liver damage at ZT12.
The gut microbial metabolite PPD was responsible, at least in part, for the diurnal variation of hepatotoxicity induced by APAP by decreasing glutathione levels.
Acetaminophen (APAP) induced acute liver failure because of over dose is a leading public health problem. APAP-induced liver injury exhibits diurnal variation, specifically APAP causes more severe liver damage when taken at night compared with in the morning. Herein, we showed that gut microbial metabolite, 1-phenyl-1,2-propanedione is involved in the rhythmic hepatotoxicity induced by APAP, by depleting hepatic glutathione (an important antioxidant) levels. Our data suggest gut microbiota may be a potential target for reducing APAP-induced acute liver injury.
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Author names in bold designate shared co-first authorship
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Published online: March 07, 2018
Accepted: February 20, 2018
Received in revised form: February 1, 2018
Received: November 27, 2017
© 2018 European Association for the Study of the Liver. Published by Elsevier B.V. All rights reserved.