Monocyte-derived dendritic cells from Crohn patients show differential NOD2/CARD15-dependent immune responses to bacteria

Autor: Gianluca M. Sampietro, Simone Saibeni, Marjan Maria van Duist, Monica Rimoldi, C. Penati, Maurizio Vecchi, Sandro Ardizzone, Maria Rescigno, Gabriele Bianchi Porro, Valentina Salucci, Gianluca Matteoli
Rok vydání: 2008
Předmět:
Zdroj: Inflammatory Bowel Diseases. 14:812-818
ISSN: 1078-0998
DOI: 10.1002/ibd.20390
Popis: Background: Three common mutations in the NOD2/CARD15 gene are strongly associated with Crohn's disease (CD). NOD2 is an intracellular receptor of muramyl dipeptide (MDP), a component of peptidoglycan present in the cell wall of Gram-positive (G+) and Gram-negative (G−) bacteria. Methods: We generated monocyte-derived dendritic cells (MoDCs) from CD patients mutated or not for CARD15 (n = 53) or from healthy donors (n = 12) and analyzed their activation in response to live Salmonella typhimurium as a model of pathogenic G− bacteria. Results: MoDCs carrying the L1007fs mutation, although phenotypically activated by bacteria, produced a significantly reduced amount of tested cytokines. MoDCs carrying R702W or compound G908R/R702W NOD2 mutations displayed an increased basal level of IL-8 release. After a bacterial encounter, these cells were phenotypically activated and produced levels of cytokines similar to healthy controls. Interestingly, although L1007fs/WT mutations conferred reduced production of cytokines, including IL-12, these cells were perfectly capable of inducing T-cell polarization toward the Th1 phenotype. Conclusions: NOD2 mutations affect the basal characteristics of MoDCs and their response to G− bacteria differently. MoDCs could be involved in CD onset because they have defects in releasing inflammatory cytokines and in polarizing T-cell responses. (Inflamm Bowel Dis 2008)
Databáze: OpenAIRE
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