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Cell Microbiol. 2020 Jan 18. doi: 10.1111/cmi.13164. [Epub ahead of print]

Omp25-dependent engagement of SLAMF1 by Brucella abortus in dendritic cells limits acute inflammation and favours bacterial persistence in vivo.

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Aix Marseille Univ, CNRS, INSERM, CIML, Centre d'Immunologie de Marseille-Luminy, Marseille, France.
Instituto de Investigaciones Biotecnológicas Universidad Nacional de San Martín (UNSAM)-CONICET, Buenos Aires, Argentina.


The strategies by which intracellular pathogenic bacteria manipulate innate immunity to establish chronicity are poorly understood. Here we show that B. abortus outer membrane protein Omp25 specifically binds the immune cell receptor SLAMF1 in vitro. The Omp25-dependent engagement of SLAMF1 by B. abortus limits NF-κB translocation in dendritic cells (DC) with no impact on Brucella intracellular trafficking and replication. This in turn decreases pro-inflammatory cytokine secretion and impairs DC activation. The Omp25-SLAMF1 axis also dampens the immune response without affecting bacterial replication in vivo during the acute phase of Brucella infection in a mouse model. In contrast, at the chronic stage of infection, the Omp25/SLAMF1 engagement is essential for Brucella persistence. Interaction of a specific bacterial protein with an immune cell receptor expressed on the DC surface at the acute stage of infection is thus a powerful mechanism to support microbe settling in its replicative niche and progression to chronicity. This article is protected by copyright. All rights reserved.


Brucella; CD150; NF-κB; Omp25; SLAMF1; acute and chronic infection; dendritic cells; inflammation


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