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

文献类型： 外文期刊

第一作者： Bao, Hongduo

作者： Bao, Hongduo;Zhang, Hui;Zhou, Yan;Zhu, Shujiao;Pang, Maoda;Shahin, Khashayar;Wang, Ran;Bao, Hongduo;Schmidt, Stefan;Olaniran, Ademola

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关键词： Lytic phage; Temperate phage; Colonization; Gut; Mice

期刊名称：FOOD PRODUCTION PROCESSING AND NUTRITION （ 影响因子：4.7； 五年影响因子：5.0 ）

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年卷期： 2020 年 2 卷 1 期

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收录情况： SCI

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 x 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) similar to 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.

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