Background Astragalus polysaccharides （APS）, the main active extract from Astragalus membranaceus （a traditional Chinese medicinal herb）, is associated with a variety of immunomodulatory activities. The purpose of...Background Astragalus polysaccharides （APS）, the main active extract from Astragalus membranaceus （a traditional Chinese medicinal herb）, is associated with a variety of immunomodulatory activities. The purpose of the present study was to examine the effect of APS on the function of Treg cells in the tumor microenvironment of human hepatocellular carcinoma （HCC） and to identify the pharmacologic mechanism of APS responsible for the anti-chemotactic activity in CD4＋CD25^highTreq cells in tumor site of HCC.展开更多
文摘目的:观察黄芪多糖(Astragalus Polysaccharides,APS)对于高脂饮食诱导的肥胖小鼠的减肥作用与调节肠道菌群的关系。方法:1)将50只C57bl/6J小鼠随机分为5组(n=10),分别为正常对照组(Con)、HFD(high-fat diet)组和APS低中高(在高脂饮食中添加分别添加2%,4%,或8%的APS)剂量组。利用高脂饮食连续喂养8周诱导出小鼠肥胖模型,给药组同步喂养,每周进行称重。实验周期结束后,收集各组粪便样本,利用基于细菌16S r DNA测序的元基因组学方法,分析了APS对于高脂喂养小鼠肠道菌的影响。2)将10只C57bl/6J小鼠随机分为2组(n=5),分别为HFD_R组(HFD_Receptor)和APS_R组(APS_Receptor),每天分别灌胃来自HFD组和APS低剂量组(2%APS)小鼠的新鲜粪便提取液进行肠道菌移植,前八周给予正常饮食,后四周更换为HFD。结果:APS能够明显抑制高脂喂养小鼠肥胖的形成、减轻肝脏脂肪变性、降低肝脏TG水平、改善胰岛素敏感性、显著恢复高脂喂养小鼠的肠道菌群紊乱,增加拟杆菌(Bacteroidetes)与厚壁门(Firmicutes)菌的相对丰度、降低变形菌门(Proteobacteria)细菌的相对丰度,并且,APS的减肥效应能够通过肠道菌移植转移给高脂喂养受体小鼠。结论:APS对高脂喂养小鼠具有减肥作用,且APS的减肥作用与调节肥胖小鼠的肠道菌群有关。
文摘Background Astragalus polysaccharides （APS）, the main active extract from Astragalus membranaceus （a traditional Chinese medicinal herb）, is associated with a variety of immunomodulatory activities. The purpose of the present study was to examine the effect of APS on the function of Treg cells in the tumor microenvironment of human hepatocellular carcinoma （HCC） and to identify the pharmacologic mechanism of APS responsible for the anti-chemotactic activity in CD4＋CD25^highTreq cells in tumor site of HCC.
