Abstract
Obesity is a worldwide epidemic and increases the risk of metabolic syndrome through chronic inflammation. Tea polyphenols (TP), the major functional component of tea, has shown preventive effects on obesity and obesity-related disease, but the underlying mechanism is complicated and remains obscure. The present study was aimed to elucidate the anti-inflammation effect of TP in high-fat-diet (HFD)-induced obese mice. Results showed that TP reduced obesity-induced inflammation and systemic lipopolysaccharides (LPS) level. The decrease of LPS level in circulation was followed by the downregulation of LPS specific receptor, toll-like receptor 4 (TLR4), and its co-receptor cluster of differentiation 14 (CD14) and adaptor protein differentiation factor 88 (MyD88) in hepatic and adipose tissues. That further inhibited the activation of nuclear factor κB (NF-κB). The serum levels of tumor necrosis factor-alpha (TNF-α), interleukin-1-beta (IL-1β) and interleukin-6 (IL-6) were significantly decreased by TP in HFD-fed mice. TP also maintained the intestinal barrier integrity by increasing intestinal tight junction proteins and reversed gut dysbiosis in obese mice. These results suggested that TP attenuated obesity-induced inflammation by reducing systemic LPS level and inhibiting LPS-activated TLR4/NF-κB pathway.
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Funding
This work was supported by the National Key Research and Development Plan (2017YFD0400803), Platform Construction Project of Chinese White Tea Science and Technology Correspondent (2020L3031), and the Science and Technology Innovation Platform Project of Fujian Provincial Department of Science and Technology (2018N2004).
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Research design: Yushan Ye and Puming He. Experiments performing: Yushan Ye, Hasitha Warusawitharana, Hangye Zhao and Puming He. Research advice: Zhonghua Liu, Yuanyuan Wu, Bo Li and Youying Tu. Data analysis and manuscript writing: Yushan Ye. Manuscript revise: Bo Li, Youying Tu and Puming He.
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The animal experiment protocol was approved by the Animal Care Committee of Zhejiang University (Approval NO. ZJU20200058).
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Ye, Y., Warusawitharana, H., Zhao, H. et al. Tea Polyphenols Attenuates Inflammation via Reducing Lipopolysaccharides Level and Inhibiting TLR4/NF-κB Pathway in Obese Mice. Plant Foods Hum Nutr 77, 105–111 (2022). https://doi.org/10.1007/s11130-021-00937-0
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DOI: https://doi.org/10.1007/s11130-021-00937-0