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© Matteo Bonazzi, Edith Gouin
Observation en immunofluorescence d'une cellule infectée par Listeria monocytogenes. En bleu: marquage des protéines de surface de Listeria qui permet de visualiser les bactéries. En rouge et vert: marquage de l'actine, une protéine qui forme le cytosquelette des cellules. Les Listeria utilisent l'actine cellulaire pour former des "comêtes" et se déplacer à l'intérieur des cellules qu'elles infectent. Cell infected by Listeria monocytogenes. The surface proteins (in blue) of Listeria enable us to view the bacteria. Actin, a constituent protein of cells, is shown in red and green.
Publication : Journal of immunology (Baltimore, Md. : 1950)

Cutting Edge: The murine high-affinity IgG receptor FcγRIV is sufficient for autoantibody-induced arthritis

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of immunology (Baltimore, Md. : 1950) - 19 Jan 2011

Mancardi DA, Jönsson F, Iannascoli B, Khun H, Van Rooijen N, Huerre M, Daëron M, Bruhns P

Link to Pubmed [PMID] – 21248252

J. Immunol. 2011 Feb;186(4):1899-903

K/BxN serum-induced passive arthritis was reported to depend on the activation of mast cells, triggered by the activating IgG receptor FcγRIIIA, when engaged by IgG1 autoantibodies present in K/BxN serum. This view is challenged by the fact that FcγRIIIA-deficient mice still develop K/BxN arthritis and because FcγRIIIA is the only activating IgG receptor expressed by mast cells. We investigated the contribution of IgG receptors, IgG subclasses, and cells in K/BxN arthritis. We found that the activating IgG2 receptor FcγRIV, expressed only by monocytes/macrophages and neutrophils, was sufficient to induce disease. K/BxN arthritis occurred not only in mast cell-deficient W(sh) mice, but also in mice whose mast cells express no activating IgG receptors. We propose that at least two autoantibody isotypes, IgG1 and IgG2, and two activating IgG receptors, FcγRIIIA and FcγRIV, contribute to K/BxN arthritis, which requires at least two cell types other than mast cells, monocytes/macrophages, and neutrophils.

http://www.ncbi.nlm.nih.gov/pubmed/21248252