Transient carriage and low-level colonization of orally administrated lytic and temperate phages in the gut of mice  

作　　者：Hongduo Bao Hui Zhang Yan Zhou Shujiao Zhu Maoda Pang Khashayar Shahin Ademola Olaniran Stefan Schmidt Ran Wang 

机构地区：[1]Key Laboratory of Control Technology and Standard for Agro-product Safety and Quality,Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology,Institute of Food Safety and Nutrition,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China [2]Discipline of Microbiology,School of Life Sciences,College of Agriculture,Engineering and Science,University of KwaZulu-Natal,Pietermaritzburg Campus,Private Bag X01,Pietermaritzburg 3201,South Africa [3]Discipline of Microbiology,School of Life Sciences,College of Agriculture,Engineering and Science,University of KwaZulu-Natal,Westville Campus,Private Bag X54001,Durban 4000,South Africa

出　　处：《Food Production, Processing and Nutrition》2020年第1期140-147,共8页食物生产加工与营养（英文）

基　　金：supported by the National Natural Science Foundation of China(NSFC 31701725 and 31950410562);the National Key R&D Program of China(No.2018YEE0101900).

摘　　要：Many studies have shown the efficacy of phage therapy in reducing gastrointestinal pathogens.However,it is unclear whether phages can successfully colonize the gut when administered in an adequate amount for a long time.About 1×10^(8)PFU/mL of purified lytic phage PA13076 or temperate phage BP96115 were fed daily to mice via drinking water over 31 days,to elucidate the distribution of phages in the gastrointestinal tract.At day 16 and 31,six different segments of the gastrointestinal tract with their contents,including stomach,duodenum,jejunum,ileum,cecum,colon,and fresh feces,were aseptically collected.The phage titers were determined using the double-layered plate method with S.Enteritidis ATCC 13076 or S.Pullorum SPu-109 used as host cells.The results indicated that a small portion of administered phages survived exposure to gastric acid and entered the intestinal tract.The prevalence of phages in the gastrointestinal tract was lower than 1%of the primary phage count.Highest phage titers were detected in the cecum with 10^(4)~10^(5)PFU/g,and most of the phages were eliminated from the body via feces with 10^(6)PFU/g.On day 16 and day 31,the same level of phage titers in different segments of the gastrointestinal tract indicated that the colonization of phages had reached saturation at day 16.These results demonstrate transient phage carriage and low-level colonization of orally administrated lytic and temperate gut phages in mice.

关 键 词：Lytic phage Temperate phage COLONIZATION GUT MICE 

分 类 号：R57[医药卫生—消化系统]