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The circadian rhythm gene Bmal1 ameliorates acute deoxynivalenol-induced liver damage

  • Organ Toxicity and Mechanisms
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Abstract

Deoxynivalenol (DON) is widely emerging in various grain crops, milk, and wine products, which can trigger different toxic effects on humans and animals by inhalation or ingestion. It also imposes a considerable financial loss on the agriculture and food industry each year. Previous studies have reported acute and chronic toxicity of DON in liver, and liver is not only the main detoxification organ for DON but also the circadian clock oscillator directly or indirectly regulates critical physiologically hepatic functions under different physiological and pathological conditions. However, researches on the association of circadian rhythm in DON-induced liver damage are limited. In the present study, mice were divided into four groups (CON, DON, Bmal1OE, and Bmal1OE + DON) and AAV8 was used to activate (Bmal1) expression in liver. Then mice were gavaged with 5 mg/kg bw/day DON or saline at different time points (ZT24 = 0, 4, 8, 12, 16, and 20 h) in 1 day and were sacrificed 30 min after oral gavage. The inflammatory cytokines, signal transducers, and activators of transcription Janus kinase/signal transducers and activator of transcription 3 (JAKs/STAT3) pathway and bile acids levels were detected by enzyme-linked immunosorbent assay (ELISA), western blotting, and target metabolomics, respectively. The DON group showed significantly elevated interleukin-1β (IL-1β), interleukin 6 (IL-6), and tumor necrosis factor-α (TNF-α) levels (P < 0.05 for both) and impaired liver function with rhythm disturbances compared to the CON and Bmal1OE groups. At the molecular level, expressions of some circadian clock proteins were significantly downregulated (P < 0.05 for both) and JAKs/STAT3 pathway was activated during DON exposure, accompanied by indicated circadian rhythm disturbance and inflammatory damage. Importantly, Bmal1 overexpression attenuated DON-induced liver damage, while related hepatic bile acids such as cholic acid (CA) showed a decreasing trend in the DON group compared with the CON group. Our study demonstrates a novel finding that Bmal1 plays a critical role in attenuating liver damage by inhibiting inflammatory levels and maintaining bile acids levels under the DON condition. Therefore, Bmal1 may also be a potential molecular target for reducing the hepatotoxic effects of DON in future studies.

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All data generated or analysed during this study are included in this article and supplementary information files.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (82173521). All raw data are also illustrated as additional data (Supplementary data Table 3-12).

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(I) Conception and design: LNY; (II) administrative support: AKN, LL, and WY; (III) provision of study materials: XZ and YL; (IV) collection and assembly of data: SX and MT; (V) data analysis and interpretation: all authors; (VI) manuscript writing: all authors; (VII) final approval of manuscript: all authors.

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Correspondence to Wei Yang.

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All experiments were approved by the Animal Care and Use Committee of Tongji Medical College, Huazhong University of Science and Technology (IACUC Number: 2794) and were performed by Animal Research Institute Committee guidelines (Guide for the Care and Use of Laboratory Animals, National Institute of Health, 1996, Bethesda, MD, USA).

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Yang, LN., Xu, S., Tang, M. et al. The circadian rhythm gene Bmal1 ameliorates acute deoxynivalenol-induced liver damage. Arch Toxicol 97, 787–804 (2023). https://doi.org/10.1007/s00204-022-03431-x

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