Probiotics may reduce risk of gut bacterial infections
An unexpected result with major implications for a preventative strategy
Spinler and Savidge established a collaboration with co-author Dr. Robert A. Britton, professor of molecular virology and microbiology at Baylor and member of the Dan L Duncan Comprehensive Cancer Center.
The Britton lab uses mini-bioreactor arrays – multiple small culture chambers – that provide a platform in which researchers could recreate the invasion of an antibiotic-treated human intestinal community by C. difficile.
“Using the mini-bioreactors model we showed that L. reuteri reduced the burden of C. difficile infection in a complex gut community,” Britton said. “To achieve its beneficial effect, L. reuteri requires glycerol and converts it into the antimicrobial reuterin.”
The literature reports reuterin as a broad-spectrum antibiotic; it affects the growth of a wide variety of bacteria when they are tested individually in the lab. What was intriguing in this study is that reuterin didn’t have a broad-spectrum effect in the mini-bioreactor bacterial community setting.
“I expected reuterin to have an antibacterial effect on several different types of bacteria in the community, but it only affected C. difficile and not the good bacteria, which was exciting because it has major implications for a preventative strategy,” Spinler said.
“Although these results are too preliminary to be translated directly into human therapy, they provide a foundation upon which to further develop treatments based on co-administration of L. reuteri and glycerol to prevent C. difficile infection,” said co-author Dr. Jennifer Auchtung, director of the Cultivation Core at Baylor’s Alkek Center for Metagenomics and Microbiome Research and assistant professor of molecular virology and microbiology at Baylor.
In the future, this potential treatment could be administered prophylactically to patients before they take antibiotics known to disrupt normal gut microbes. The L. reuteri/glycerol formulation would help maintain the healthy gut microbial community and also help prevent the growth of C. difficile, which would result in decreased hospital stay and costs and reduced long-term health consequences of C. difficile recurrent infections.
Other contributors to this work include Aaron Brown, Prapaporn Boonma, Numan Oezguen, Caná L. Ross, Ruth Ann Luna, Jessica Runge, James Versalovic, Alex Peniche, Sara M. Dann, and Anthony Haag. The authors are associated with one or more of the following institutions: Baylor College of Medicine, Texas Children’s Hospital and The University of Texas Medical Branch in Galveston.
Spinler conducted this study with pilot and feasibility funding (DK56338) she received from the Texas Medical Center Digestive Diseases Center. Additional financial support was provided by the National Institute of Allergy and Infectious Diseases (NIAID) R01 AI10094001 and U01 AI124290-01, the Institute for Translational Sciences at The University of Texas Medical Branch, (supported in part by a Clinical and Translational Science Award UL1TR000071), the National Center for Advancing Translational Sciences, the National Institutes of Health and the NIAID (5U19AI090872-02).