Journal
FOOD & FUNCTION
Volume 10, Issue 7, Pages 3898-3908Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9fo00572b
Keywords
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Funding
- Anhui Provincial Natural Science Foundation [1708085QC79, 1808085QC77]
- Anhui Provincial Key Research and Development Program [1804b06020367]
- NSFC [31701600]
- Earmarked fund for China Agriculture Research System [CARS-19]
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Inflammatory liver diseases present a significant public health problem. Green tea polyphenols (GTPs) have a myriad of health benefits in animals and humans, including alleviating of hepatic inflammation; however, the underlying mechanisms are complicated and remain unclear. The current study investigated the preventive effects and mechanism of GTPs on lipopolysaccharide (LPS)-induced inflammatory liver injury in mice. The ICR mice received intragastric GTPs once per day for 7 consecutive days prior to LPS stimulation (15 mg kg(-1), intraperitoneally) and liver damage and oxidative stress, pro-inflammatory cytokines, and the hepatic nuclear factor-kappa B (NF-kappa B) and Nod-like receptor family, pyrin domain containing 3 (NLRP3) inflammasomes were observed. Our results showed that GTP supplementation significantly reduced LPS-induced plasma alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels and hepatic malondialdehyde (MDA) levels; and LPS-induced reduction of glutathione (GSH) levels and total superoxide dismutase (T-SOD) activities was drastically improved by GTP pretreatment. GTP supplementation significantly reduced plasma contents and hepatic mRNA levels of interleukin (IL)-1 beta, IL-18, IL-6, and tumor necrosis factor (TNF)-alpha, compared with LPS-treated mice which did not receive GTP treatment. In addition, the production of cytokines, such as IL-1 beta, IL-18, IL-6, and TNF-alpha in mice livers, and acute-phase response (plasma levels of nitric oxide and C-reactive protein) were also decreased following GTP pre-treatment. Furthermore, GTPs reduced LPS-induced hepatic NF-kappa B signaling and NLRP3 inflammasome activation. GTPs exert protective effects against inflammatory liver injury by regulating NF-kappa B signaling and the NLRP3 inflammasome activation. Our findings suggest that dietary GTP supplementation may be an adjunctive prevention and treatment for acute liver injury-associated inflammation.
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