Enterococcus faecalis induces inflammatory bowel disease in interleukin-10 knockout mice

Area of Science:

• Microbiology
• Immunology
• Gastroenterology

Background:

• Interleukin-10 (IL-10) is crucial for immune homeostasis in the gut.
• Deficiency in IL-10 leads to spontaneous inflammatory bowel disease (IBD) in mice.
• The role of specific gut microbes in IBD pathogenesis is under investigation.

Purpose of the Study:

• To investigate the role of Enterococcus faecalis in the development of IBD and associated pathologies.
• To determine if specific gut bacteria can induce IBD in a genetically susceptible host.

Main Methods:

• Germ-free IL-10 knockout (KO) mice were colonized with Enterococcus faecalis.
• Conventional IL-10 KO mice and germ-free IL-10 mice served as controls.
• Colonization with other specific bacterial species and Candida albicans was also tested.

Main Results:

• Enterococcus faecalis colonization induced IBD, rectal dysplasia, and adenocarcinoma in germ-free IL-10 KO mice.
• Conventional IL-10 KO mice exhibited more severe IBD pathology compared to E. faecalis-induced IBD.
• Colonization with other tested microbes did not induce IBD in germ-free IL-10 mice.

Conclusions:

• Enterococcus faecalis can act as a trigger for IBD, dysplasia, and carcinoma in genetically susceptible murine models.
• Specific microbial triggers may be involved in the development of IBD in IL-10 deficient individuals.
• Further research is warranted to understand the mechanisms by which E. faecalis induces these pathologies.