目的使用粪菌移植方法经口途径获得阿尔茨海默症人源肠道菌群(human flora-associated,HFA模型小鼠,并通过生物信息学、组织病理学等方法对模型进行评价。方法无菌雌性C57BL/6J小鼠28只,随机分为阿尔茨海默症模型(AD)组和对照(CON)组,...目的使用粪菌移植方法经口途径获得阿尔茨海默症人源肠道菌群(human flora-associated,HFA模型小鼠,并通过生物信息学、组织病理学等方法对模型进行评价。方法无菌雌性C57BL/6J小鼠28只,随机分为阿尔茨海默症模型(AD)组和对照(CON)组,分别经口途径接种阿尔茨海默症患者及健康志愿者的新鲜粪便悬液,在移植6、10周后每组安乐7只动物,取粪便进行16S r DNA检测;取脑组织和血液进行Aβ含量、细胞因子检测,脑组织进行组织病理学检查。结果CON组与AD组动物体重增长差异无显著性。α-多样性分析,在造模后两个时间点AD组Simpson指数升高(P<0.05,P<0.01),ACE(P<0.05)和Chao1(P<0.05),Shannon指数降低(P<0.05,P<0.01),与CON组比较差异有显著性。在科水平,AD组拟杆菌科丰度升高(P<0.01,P<0.05),毛螺菌科(P<0.001)、消化链球菌科(P<0.01)丰度降低;在属水平,AD组拟杆菌属丰度升高(P<0.01,P<0.05),梭菌属(P<0.01,P<0.05)、毛螺菌属(P<0.01,P<0.0001)、寄生菌属(P<0.01,P<0.001)丰度降低,与CON比较差异有显著性。β-多样性分析结果,AD组、CON组不同时间点肠型分布在相同区域,不同组别肠型分布在不同区间。2组动物的肠道菌群在微生物物种构成方面存在显著性差异(P<0.05)。AD组小鼠在建模10周时血液和脑中Aβ40含量升高(P<0.05,P<0.01),与CON组比较差异有显著性。与老年斑形成相关的细胞因子检测,IL-1β在建模6周时浓度降低(P<0.05);IL-10在建模6周时升高(P<0.01);TGF-β在建模10周时浓度降低(P<0.01),与CON组比较差异有统计学意义。组织病理学检查未见老年斑生成。结论本研究通过接种患者粪便悬液的方法建立了阿尔茨海默症人源菌群小鼠模型,模型小鼠肠道菌群的结构丰度、与老年斑生成相关细胞因子含量等指标的改变与阿尔茨海默症病人的临床表现类似。展开更多
本文研究了香蕉抗性淀粉对高脂饮食菌群人源化小鼠(HFA)肠道菌群的调控效果。将30只肠道菌群人源化昆明小鼠随机分为3组(10只/组),分别饲喂普通饮食、高脂饮食和高脂饮食+抗性淀粉。提取第0周和第8周新鲜粪便DNA,比较用16S r DNAV6-V8...本文研究了香蕉抗性淀粉对高脂饮食菌群人源化小鼠(HFA)肠道菌群的调控效果。将30只肠道菌群人源化昆明小鼠随机分为3组(10只/组),分别饲喂普通饮食、高脂饮食和高脂饮食+抗性淀粉。提取第0周和第8周新鲜粪便DNA,比较用16S r DNAV6-V8区段特异性引物扩增产物,以PCR-DGGE技术手段检测抗性淀粉组、高脂饮食组和普通饮食组肠道菌群差异。第0周,三组小鼠菌群总菌丰富度,多样性指数和均匀度无显著差异(p>0.05),小鼠和粪便供者之间菌群相似性为36%;三组小鼠肠道菌群相似性达到60-93%,PCA分析显示三组小鼠的数据点都聚在一起,说明在干预前无明显差异,适用于分析抗性淀粉对肠道菌群的影响;膳食干涉第8周后小鼠肠道菌群的多样性指数和丰富度数值,抗性淀粉组都极显著低于高脂组和普通饲料组(p<0.01),PCA分析也显示三组小鼠肠道菌群各组的数据点都分布在不同区域,说明抗性淀粉对高脂饮食HFA小鼠肠道菌群结构产生显著影响。展开更多
Fecal Coliform Bacteria (FCB) of marine waters was monitored in Luoyuan Bay from January, 2003 to December, 2005. The results showed that number of FCB in marine water samples ranged from no detection ( 〈2 cfu/100...Fecal Coliform Bacteria (FCB) of marine waters was monitored in Luoyuan Bay from January, 2003 to December, 2005. The results showed that number of FCB in marine water samples ranged from no detection ( 〈2 cfu/100 mL) to 540 cfu/100 mL in Luoyuan Bay. Values of FCB during August to October were significantly higher than those during January to April during three year period. Monthly changes of FCB values at each year period were mainly due to monthly precipitation. In addition, compared with FCB values in difference sample sites, values of FCB in Bay-heed were significantly higher than those in middle of bay and Bay-mouth, Luoyuan Bay. However, values of FCB in Bay-mouth were significantly less than those in middle of bay. The ratios to the par of FCB in 2003, 2004, and 2005 years were 100%, 98.0%, and 97.9%, respectively. Therefore, we considered that the pollution of FCB of surface marine water in Luoyuan Bay was not serious.展开更多
文摘目的使用粪菌移植方法经口途径获得阿尔茨海默症人源肠道菌群(human flora-associated,HFA模型小鼠,并通过生物信息学、组织病理学等方法对模型进行评价。方法无菌雌性C57BL/6J小鼠28只,随机分为阿尔茨海默症模型(AD)组和对照(CON)组,分别经口途径接种阿尔茨海默症患者及健康志愿者的新鲜粪便悬液,在移植6、10周后每组安乐7只动物,取粪便进行16S r DNA检测;取脑组织和血液进行Aβ含量、细胞因子检测,脑组织进行组织病理学检查。结果CON组与AD组动物体重增长差异无显著性。α-多样性分析,在造模后两个时间点AD组Simpson指数升高(P<0.05,P<0.01),ACE(P<0.05)和Chao1(P<0.05),Shannon指数降低(P<0.05,P<0.01),与CON组比较差异有显著性。在科水平,AD组拟杆菌科丰度升高(P<0.01,P<0.05),毛螺菌科(P<0.001)、消化链球菌科(P<0.01)丰度降低;在属水平,AD组拟杆菌属丰度升高(P<0.01,P<0.05),梭菌属(P<0.01,P<0.05)、毛螺菌属(P<0.01,P<0.0001)、寄生菌属(P<0.01,P<0.001)丰度降低,与CON比较差异有显著性。β-多样性分析结果,AD组、CON组不同时间点肠型分布在相同区域,不同组别肠型分布在不同区间。2组动物的肠道菌群在微生物物种构成方面存在显著性差异(P<0.05)。AD组小鼠在建模10周时血液和脑中Aβ40含量升高(P<0.05,P<0.01),与CON组比较差异有显著性。与老年斑形成相关的细胞因子检测,IL-1β在建模6周时浓度降低(P<0.05);IL-10在建模6周时升高(P<0.01);TGF-β在建模10周时浓度降低(P<0.01),与CON组比较差异有统计学意义。组织病理学检查未见老年斑生成。结论本研究通过接种患者粪便悬液的方法建立了阿尔茨海默症人源菌群小鼠模型,模型小鼠肠道菌群的结构丰度、与老年斑生成相关细胞因子含量等指标的改变与阿尔茨海默症病人的临床表现类似。
文摘本文研究了香蕉抗性淀粉对高脂饮食菌群人源化小鼠(HFA)肠道菌群的调控效果。将30只肠道菌群人源化昆明小鼠随机分为3组(10只/组),分别饲喂普通饮食、高脂饮食和高脂饮食+抗性淀粉。提取第0周和第8周新鲜粪便DNA,比较用16S r DNAV6-V8区段特异性引物扩增产物,以PCR-DGGE技术手段检测抗性淀粉组、高脂饮食组和普通饮食组肠道菌群差异。第0周,三组小鼠菌群总菌丰富度,多样性指数和均匀度无显著差异(p>0.05),小鼠和粪便供者之间菌群相似性为36%;三组小鼠肠道菌群相似性达到60-93%,PCA分析显示三组小鼠的数据点都聚在一起,说明在干预前无明显差异,适用于分析抗性淀粉对肠道菌群的影响;膳食干涉第8周后小鼠肠道菌群的多样性指数和丰富度数值,抗性淀粉组都极显著低于高脂组和普通饲料组(p<0.01),PCA分析也显示三组小鼠肠道菌群各组的数据点都分布在不同区域,说明抗性淀粉对高脂饮食HFA小鼠肠道菌群结构产生显著影响。
文摘Fecal Coliform Bacteria (FCB) of marine waters was monitored in Luoyuan Bay from January, 2003 to December, 2005. The results showed that number of FCB in marine water samples ranged from no detection ( 〈2 cfu/100 mL) to 540 cfu/100 mL in Luoyuan Bay. Values of FCB during August to October were significantly higher than those during January to April during three year period. Monthly changes of FCB values at each year period were mainly due to monthly precipitation. In addition, compared with FCB values in difference sample sites, values of FCB in Bay-heed were significantly higher than those in middle of bay and Bay-mouth, Luoyuan Bay. However, values of FCB in Bay-mouth were significantly less than those in middle of bay. The ratios to the par of FCB in 2003, 2004, and 2005 years were 100%, 98.0%, and 97.9%, respectively. Therefore, we considered that the pollution of FCB of surface marine water in Luoyuan Bay was not serious.