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Epigallocatechin Gallate (EGCG) Promotes the Immune Function of Ileum in High Fat Diet Fed Mice by Regulating Gut Microbiome Profiling and Immunoglobulin Production

文献类型： 外文期刊

作者： Liu, Xiaoxia 1 ; Zhao, Ke 1 ; Jing, Nana 2 ; Kong, Qingjun 2 ; Yang, Xingbin 2 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Food Sci, Hangzhou, Peoples R China

2.Shaanxi Normal Univ, Shaanxi Engn Lab Food Green Proc & Safety Control, Shaanxi Key Lab Hazard Factors Assessment Proc &, Xian, Peoples R China

3.Shaanxi Normal Univ, Xian Key Lab Characterist Fruit Storage & Fresh K, Coll Food Engn & Nutr Sci, Xian, Peoples R China

关键词： epigallocatedhin gallate; high fat diet; gut microbiota; ileum; transcriptome

期刊名称：FRONTIERS IN NUTRITION （ 影响因子：6.576； ）

ISSN： 2296-861X

年卷期： 2021 年 8 卷

页码：

收录情况： SCI

摘要： This study aimed to investigate the regulatory effect of epigallocatechin gallate (EGCG) on the composition of the gut microbiome, the transcriptomic profiling of ileum, and their interplay in high fat diet (HFD) induced obese mice. Intragastric administration of EGCG to C57BL/6J mice for 14 consecutive weeks remarkably decreased HFD induced excessive fat deposition (p < 0.001), and the increment of serum TG, TC, HDL-C (p < 0.05), as well as improved glucose tolerance (p < 0.001). EGCG shifted the gut microbiota mainly by elevating the relative abundance of Parasutterrlla, Bacteroides, and Akkermansia (p < 0.01), decreasing that of norank_f_Erysipelotrichaceae, unclassified_f_Ruminococcaceae, Anaerotruncus, Roseburia, norank_Lachnospiraceae, and Lachnospiraceae_UCG_006 (p < 0.01) at the genus level. In addition, EGCG affected the transcriptomic profiling of ileum, and the differentially expressed (DE) genes after HFD or/and EGCG treatment were mostly enriched in the immune reaction of ileum, such as the GO term of "immune effector process" and "phagocytosis, recognition." Furthermore, the KEGG category of "immune diseases," "immune system," and "infection diseases: bacterial" were commonly enriched by the DE genes of the two treatments. Among those DE genes, 16 immunoglobulins heavy chain variable region encoded genes (Ighvs) and other immunity-related genes, such as complement component 2 (C2), interferon-induced transmembrane protein 1 (Iftm1), polymeric immunoglobulin receptor (pigR), and alanyl aminopeptidase (Anpep), were highly correlated with the shifted microbes in the gut (p < 0.05, absolute r > 0.5). Overall, the results suggested that EGCG ameliorated the HFD induced metabolic disorder mainly by regulating gut microbiome profiling and the immunoglobulin production of ileum, while the genes expressed in the ileum, especially Ighvs, C2, Iftm1, pigR, and Anpep, might play important roles in coordinating the immunity of mice regarding the gut microbes and the host interactions.

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