Publikationsdatenbank

Parasitic nematodes exert antimicrobial activity and benefit from microbiota-driven support for host immune regulation (2018)

Art

Zeitschriftenartikel / wissenschaftlicher Beitrag

Autoren

Rausch, Sebastian (WE 6)

Midha, Ankur (WE 6)

Kuhring, Matthias

Affinass, Nicole (WE 6)

Radonic, Aleksandar

Kühl, Anja A.

Bleich, André

Hartmann, Susanne (WE 6)

Quelle

Frontiers in immunology

Seiten: 1

ISSN: 1664-3224

Sprache

Englisch

Verweise

URL (Volltext): https://www.frontiersin.org/articles/10.3389/fimmu.2018.02282/full

DOI: 10.3389/fimmu.2018.02282

Kontakt

Institut für Immunologie

Robert-von-Ostertag-Str. 7-13
14163 Berlin
+49 30 838 51834
immunologie@vetmed.fu-berlin.de

Abstract / Zusammenfassung

Intestinal parasitic nematodes live in intimate contact with the host microbiota. Changes in the microbiome composition during nematode infection affect immune control of the parasites and shifts in the abundance of bacterial groups have been linked to the immunoregulatory potential of nematodes. Here we asked if the small intestinal parasite Heligmosomoides polygyrus produces factors with antimicrobial activity, senses its microbial environment and if the anti-nematode immune and regulatory responses are altered in mice devoid of gut microbes. We found that H. polygyrus excretory/secretory products exhibited antimicrobial activity against gram+/- bacteria. Parasites from germ-free mice displayed alterations in gene expression, comprising factors with putative antimicrobial functions such as chitinase and lysozyme. Infected germ-free mice developed increased small intestinal Th2 responses coinciding with a reduction in local Foxp3+RORγt+ regulatory T cells and decreased parasite fecundity. Our data suggest that nematodes sense their microbial surrounding and have evolved factors that limit the outgrowth of certain microbes. Moreover, the parasites benefit from microbiota-driven immune regulatory circuits, as an increased ratio of intestinal Th2 effector to regulatory T cells coincides with reduced parasite fitness in germ-free mice.