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Commensal-pathogen interactions in the intestinal tract

Reynolds, Lisa A., Smith, Katherine A., Filbey, Kara J., Harcus, Yvonne, Hewitson, James P., Redpath, Stephen A., Valdez, Yanet, Yebra, María J., Finlay, B. Brett and Maizels, Rick M. 2014. Commensal-pathogen interactions in the intestinal tract. Gut Microbes 5 (4) , pp. 522-532. 10.4161/gmic.32155

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Abstract

The intestinal microbiota are pivotal in determining the developmental, metabolic and immunological status of the mammalian host. However, the intestinal tract may also accommodate pathogenic organisms, including helminth parasites which are highly prevalent in most tropical countries. Both microbes and helminths must evade or manipulate the host immune system to reside in the intestinal environment, yet whether they influence each other’s persistence in the host remains unknown. We now show that abundance of Lactobacillus bacteria correlates positively with infection with the mouse intestinal nematode parasite, Heligmosomoides polygyrus, as well as with heightened regulatory T cell (Treg) and Th17 responses. Moreover, H. polygyrus raises Lactobacillus species abundance in the duodenum of C57BL/6 mice, which are highly susceptible to H. polygyrus infection, but not in BALB/c mice, which are relatively resistant. Sequencing of samples at the bacterial gyrB locus identified the principal Lactobacillus species as L. taiwanensis, a previously characterized rodent commensal. Experimental administration of L. taiwanensis to BALB/c mice elevates regulatory T cell frequencies and results in greater helminth establishment, demonstrating a causal relationship in which commensal bacteria promote infection with an intestinal parasite and implicating a bacterially-induced expansion of Tregs as a mechanism of greater helminth susceptibility. The discovery of this tripartite interaction between host, bacteria and parasite has important implications for both antibiotic and anthelmintic use in endemic human populations.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > R Medicine (General)
Uncontrolled Keywords: Commensal, Microbiota, Duodenum, Lactobacillus, Nematode, Th17, Treg
Publisher: Taylor and Francis/Landes Bioscience
ISSN: 1949-0976
Date of Acceptance: 25 July 2014
Last Modified: 03 Jun 2020 17:00
URI: http://orca.cf.ac.uk/id/eprint/87513

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