绿茶多酚调节小鼠的菌群多样性和脂代谢
Title：
Green Tea Polyphenols Modulate Colonic Microbiota Diversity and Lipid Metabolism in High-Fat Diet Treated HFA Mice
Abstract：
There is an increasing interest in the effect of dietary polyphenols on the intestinal microbiota and the possible associations between this effect and the development of obesity. However, limited information is available on how these polyphenols affect the gut microbiota and lipid metabolism. The co-action of a high-fat diet (HFD) and tea polyphenol (TP) on gut microbiota and lipid metabolism using a human flora-associated (HFA) C57BL/6J mice model is studied. TP reduced serum total cholesterol, triglyceride, low density lipoprotein, glucose (GLU) and insulin (INS) levels of HFD mice in a dose-dependent manner (P < 0.01). TP also significantly increased acetic acid and butyric acid levels in HFA mice. 16S rRNA V3 region Polymerase Chain Reaction-Denaturing Gradient Gel Electrophoresis (PCR-DGGE) profiles showed that HFD mice had significantly reduced microbial diversity. This reduction could be alleviated by TP, with a significant increase in the richness and diversity of colonic microbiota in the high-fat diet with 0.2% TP (TPM) and high-fat diet with 0.05% TP (TPL) groups (P < 0.05). 454 pyrosequencing analysis showed that the HFD group had a significant increase in the Bacteroidetes to Firmicutes (F/B) ratio (P < 0.001), which could effectively be reversed by TP. The results showed that the changes in composition and diversity of colonic microbiota by TP administration suppressed the host body weight and blood lipid increase in high-fat diet HFA mice.
All Authors：
Li Wang, Benhua Zeng, Zhiwei Liu, Zhenlin Liao, Qingping Zhong, Lihui Gu, Hong Wei, Xiang Fang
First Authors：
Li Wang, Benhua Zeng
Correspondence：
Hong Wei, Xiang Fang
摘要：
绿茶多酚（TP）低、中、高（0.05%、0.2%、0.8%）剂量组均可显著降低高脂饲料诱导的人源菌群（HFA）小鼠血清总胆固醇、甘油三酯、低密度脂蛋白、葡萄糖和胰岛素水平，且呈剂量依赖性；TP显著增加HFA小鼠中的乙酸和丁酸水平；其中低、中剂量组结肠菌群的丰富度和多样性显着增加；逆转厚壁菌门/拟杆菌门的比值升高（中剂量最优；中、高剂量组显著降低梭菌属丰度，提高拟杆菌属丰度，低剂量组显著提高turicibacter和毛螺菌属丰度。