Abstract
Purpose
To investigate the novel molecular mechanisms of the antioxidant and anti-inflammatory properties of S-allylmercaptocysteine (SAMC) based on a transcriptomic study in a nonalcoholic steatohepatitis (NASH) rat model
Methods
NASH was induced in Sprague–Dawley rats by feeding with a high fat diet (HFD) for 12 weeks. 200 mg/kg SAMC was fed by oral gavage for 4 weeks from 9 to 12 week.
Results
SAMC co-administration attenuated HFD-induced liver injury, including the increased serum ALT, hepatic oxidative stress and inflammation. Transcriptomic analysis revealed that SAMC dramatically induced the XRE- and ARE-driven drug metabolising enzymes (DMEs) including Akr7a3, Akr1b8, and Nqo1. The nuclear translocation of the upstream regulator of xenobiotics metabolism, AHR, and regulator of antioxidant responses, NRF2, were significantly increased by SAMC treatment. Furthermore, SAMC counteracted the effects of HFD on NF-κB/IκB and NLRP3/6 pathways with decreasing protein levels of ASC, cleaved caspase-1, IL-18, and IL-1β. These results were further verified in another mice NASH model induced by an MCD diet with SAMC co-administration.
Conclusion
We propose that SAMC triggers AHR/NRF2-mediated antioxidant responses which may further suppress the NLRP3/6 inflammasome pathway and NF-κB activation, contributing to the improvement of NASH.
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Data availability
Not applicable.
Abbreviations
- ARNT:
-
Ah receptor nuclear translocator
- AKRs:
-
Aldo-reductases
- ARE:
-
Antioxidant response element
- AHR:
-
Aryl-hydrocarbon receptor
- DMEs:
-
Drug metabolising enzymes
- FFA:
-
Free fatty acid
- H&E:
-
Haematoxylin and eosin
- HFD:
-
High fat diet
- MDA:
-
Malondialdehyde
- MCD:
-
Methionine-chlorine deficient
- NAS:
-
NAFLD activity scoring
- NAFLD:
-
Nonalcoholic fatty liver disease
- NASH:
-
Nonalcoholic steatohepatitis
- NRF2:
-
Nuclear factor (erythroid-derived 2)-like 2
- NLRP3:
-
NOD-like receptor protein 3
- NLRP6:
-
NOD-like receptor protein 6
- SAMC:
-
S-allylmercaptocysteine
- ALT:
-
Serum alanine aminotransferase
- XRE:
-
Xenobiotic response element
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This research was funded by Seed Fund for Basic Research of University Research Committee, grant number 20161159263.
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QY: investigation, data curation, and writing—original draft preparation. YYL, Z-YX, and ECL: investigation and data curation. JX and GLT: conceptualization, methodology, supervision, resources, and writing—reviewing.
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We do not have any professional relationships with companies or manufacturers who will benefit from the results of the present study. We declare that the results of the study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation.
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The manuscript does not contain clinical studies or patient data. The entire animal experiment procedures were approved by the Committee of Animal Use for Research and Teaching at The University of Hong Kong (CULATR No. 4618-18), which is fully accredited by the Association for Assessment and Accreditation of Laboratory Animal Care International (AAALAC International).
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Yu, Q., Lee, Yy., Xia, Zy. et al. S-allylmercaptocysteine improves nonalcoholic steatohepatitis by enhancing AHR/NRF2-mediated drug metabolising enzymes and reducing NF-κB/IκBα and NLRP3/6-mediated inflammation. Eur J Nutr 60, 961–973 (2021). https://doi.org/10.1007/s00394-020-02305-1
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DOI: https://doi.org/10.1007/s00394-020-02305-1