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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 : Immunity

Ly6C hi monocytes in the inflamed colon give rise to proinflammatory effector cells and migratory antigen-presenting cells

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Immunity - 06 Dec 2012

Zigmond E, Varol C, Farache J, Elmaliah E, Satpathy AT, Friedlander G, Mack M, Shpigel N, Boneca IG, Murphy KM, Shakhar G, Halpern Z, Jung S

Link to Pubmed [PMID] – 23219392

Immunity 2012 Dec;37(6):1076-90

Ly6C(hi) monocytes seed the healthy intestinal lamina propria to give rise to resident CX(3)CR1(+) macrophages that contribute to the maintenance of gut homeostasis. Here we report on two alternative monocyte fates in the inflamed colon. We showed that CCR2 expression is essential to the recruitment of Ly6C(hi) monocytes to the inflamed gut to become the dominant mononuclear cell type in the lamina propria during settings of acute colitis. In the inflammatory microenvironment, monocytes upregulated TLR2 and NOD2, rendering them responsive to bacterial products to become proinflammatory effector cells. Ablation of Ly6C(hi) monocytes ameliorated acute gut inflammation. With time, monocytes differentiated into migratory antigen-presenting cells capable of priming naive T cells, thus acquiring hallmarks reminiscent of dendritic cells. Collectively, our results highlight cellular dynamics in the inflamed colon and the plasticity of Ly6C(hi) monocytes, marking them as potential targets for inflammatory bowel disease (IBD) therapy.

http://www.ncbi.nlm.nih.gov/pubmed/23219392