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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 : Nature immunology

Leptospiral lipopolysaccharide activates cells through a TLR2-dependent mechanism

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature immunology - 01 Apr 2001

Werts C, Tapping RI, Mathison JC, Chuang TH, Kravchenko V, Saint Girons I, Haake DA, Godowski PJ, Hayashi F, Ozinsky A, Underhill DM, Kirschning CJ, Wagner H, Aderem A, Tobias PS, Ulevitch RJ

Link to Pubmed [PMID] – 11276206

Nat. Immunol. 2001 Apr;2(4):346-52

Leptospira interrogans are zoonotic pathogens that have been linked to a recent increased incidence of morbidity and mortality in highly populated tropical urban centers. They are unique among invasive spirochetes in that they contain outer membrane lipopolysaccharide (LPS) as well as lipoproteins. Here we show that both these leptospiral outer membrane constituents activate macrophages through CD14 and the Toll-like receptor 2 (TLR2). Conversely, it seems that TLR4, a central component for recognition of Gram-negative LPS, is not involved in cellular responses to L. interrogans. We also show that for intact L. interrogans, it is LPS, not lipoprotein, that constitutes the predominant signaling component for macrophages through a TLR2 pathway. These data provide a basis for understanding the innate immune response caused by leptospirosis and demonstrate a new ligand specificity for TLR2.

http://www.ncbi.nlm.nih.gov/pubmed/11276206