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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

CCL20 Displays Antimicrobial Activity Against Cryptosporidium parvum, but Its Expression Is Reduced During Infection in the Intestine of Neonatal Mice

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Journal of infectious diseases - 02 Apr 2015

Guesdon W, Auray G, Pezier T, Bussière FI, Drouet F, Le Vern Y, Marquis M, Potiron L, Rabot S, Bruneau A, Werts C, Laurent F, Lacroix-Lamandé S

Link to Pubmed [PMID] – 25838265

J. Infect. Dis. 2015 Oct;212(8):1332-40

CCL20 is a chemokine with antimicrobial activity. We investigated its expression and role during neonatal cryptosporidiosis, a worldwide protozoan enteric disease leading to severe diarrhea. Surprisingly, during infection by Cryptosporidium parvum, CCL20 production by the intestine of neonatal mice is reduced by a mechanism independent both of the enteric flora and of interferon γ, a key cytokine for the resolution of this infection. However, oral administration of recombinant CCL20 to neonatal mice significantly reduced the parasite load by a mechanism that was independent of immune cell recruitment and occurred instead by direct cytolytic activity on free stages of the parasite. MiR21 functionally targets CCL20 and is upregulated during the infection, thus contributing to the downregulation of the chemokine. Our findings demonstrate for the first time the direct antiparasitic activity of CCL20 against an enteric protozoan and its downregulation during C. parvum infection, which is detrimental to parasite clearance.

http://www.ncbi.nlm.nih.gov/pubmed/25838265