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© Christine Schmitt, Meriem El Ghachi, Jean-Marc Panaud
Bactérie Helicobacter pylori en microscopie électronique à balayage. Agent causal de pathologies de l'estomac : elle est responsable des gastrites chroniques, d'ulcères gastriques et duodénaux et elle joue un rôle important dans la genèse des cancers gastriques (adénocarcinomes et lymphomes).
Publication : The Journal of infectious diseases

Poly(I:C)-induced protection of neonatal mice against intestinal Cryptosporidium parvum infection requires an additional TLR5 signal provided by the gut flora

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Journal of infectious diseases - 06 Sep 2013

Lantier L, Drouet F, Guesdon W, Mancassola R, Metton C, Lo-Man R, Werts C, Laurent F, Lacroix-Lamandé S

Link to Pubmed [PMID] – 24014881

J. Infect. Dis. 2014 Feb;209(3):457-67

The neonatal intestinal immune system is still undergoing development at birth, leading to a higher susceptibility to mucosal infections. In this study, we investigated the effect of poly(I:C) on controlling enteric infection by the protozoan Cryptosporidium parvum in neonatal mice. After poly(I:C) administration, a rapid reduction in parasite burden was observed and proved to be dependent on CD11c(+) cells and TLR3/TRIF signaling. Protection against C. parvum required additional signals provided by the gut flora through TLR5 and MyD88 signaling. This cooperation gave rise to higher levels of expression of critical mutually dependent cytokines such as interleukin 12p40 and type 1 and type 2 interferons, the last 2 being known to play a key role in the elimination of infected enterocytes. Our findings demonstrate in neonatal mice how gut flora synergizes with poly(I:C) to elicit protective intestinal immunity against an intracellular pathogen.

http://www.ncbi.nlm.nih.gov/pubmed/24014881