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Journal of Microbiology

, Volume 55, Issue 11, pp 892–899 | Cite as

Bile salt hydrolase-mediated inhibitory effect of Bacteroides ovatus on growth of Clostridium difficile

  • Soobin Yoon
  • Junsun Yu
  • Andrea McDowell
  • Sung Ho Kim
  • Hyun Ju YouEmail author
  • GwangPyo KoEmail author
Microbial Pathogenesis and Host-Microbe Interaction

Abstract

Clostridium difficile infection (CDI) is one of the most common nosocomial infections. Dysbiosis of the gut microbiota due to consumption of antibiotics is a major contributor to CDI. Recently, fecal microbiota transplantation (FMT) has been applied to treat CDI. However, FMT has important limitations including uncontrolled exposure to pathogens and standardization issues. Therefore, it is necessary to evaluate alternative treatment methods, such as bacteriotherapy, as well as the mechanism through which beneficial bacteria inhibit the growth of C. difficile. Here, we report bile acid-mediated inhibition of C. difficile by Bacteroides strains which can produce bile salt hydrolase (BSH). Bacteroides strains are not commonly used to treat CDI; however, as they comprise a large proportion of the intestinal microbiota, they can contribute to bile acid-mediated inhibition of C. difficile. The inhibitory effect on C. difficile growth increased with increasing bile acid concentration in the presence of Bacteroides ovatus SNUG 40239. Furthermore, this inhibitory effect on C. difficile growth was significantly attenuated when bile acid availability was reduced by cholestyramine, a bile acid sequestrant. The findings of this study are important due to the discovery of a new bacterial strain that in the presence of available bile acids inhibits growth of C. difficile. These results will facilitate development of novel bacteriotherapy strategies to control CDI.

Keywords

Clostridium difficile bile salt hydrolase Bacteroides ovatus 

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Copyright information

© The Microbiological Society of Korea and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Department of Environmental Health Sciences, Graduate School of Public HealthSeoul National UniversitySeoulRepublic of Korea
  2. 2.KoBioLabs, Inc.SeoulRepublic of Korea
  3. 3.Center for Human and Environmental Microbiome, Institute of Health and EnvironmentSeoul National UniversitySeoulRepublic of Korea
  4. 4.Bio-MAX/N-BioSeoul National UniversitySeoulRepublic of Korea

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