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- W2013216100 abstract "Infection with Brucella abortus induces a pro-inflammatory response that drives T cell responses toward a Th1 profile. The mechanism by which this bacterium triggers this response is unknown. Dendritic cells (DC) are crucial mediators at the host-pathogen interface and are potent Th1-inducing antigen-presenting cells. Thus, we examined the mechanism whereby B. abortus stimulate human DC maturation. B. abortus-infected DC increased the expression of CD86, CD80, CCR7, CD83, MHCII, MHCI and CD40 and induced the production of TNF-α, IL-6, IL-10 and IL-12. Both phenomena were not dependent on bacterial viability since they were also induced by heat-killed B. abortus (HKBA). B. abortus LPS was unable to induce markers up-regulation or cytokine production. We next investigated the capacity of the outer membrane protein 19 (Omp19) as a B. abortus lipoprotein model to induce DC maturation. Lipidated Omp19 (L-Omp19), but not its unlipidated form, increased the expression of cell surface markers and the secretion of cytokines. L-Omp19-matured DC also have decreased endocytic activity and displayed enhanced T cell stimulatory activity in a MLR. Pre-incubation of DC with anti-TLR2 mAb blocked L-Omp19-mediated cytokine production. These results demonstrate that B. abortus lipoproteins can stimulate DC maturation providing a mechanism by which these bacteria generate a Th1-type immune response." @default.
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- W2013216100 date "2008-10-01" @default.
- W2013216100 modified "2023-10-08" @default.
- W2013216100 title "Brucella lipoproteins mimic dendritic cell maturation induced by Brucella abortus" @default.
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- W2013216100 doi "https://doi.org/10.1016/j.micinf.2008.07.035" @default.
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