CCL20/CCR6 blockade enhances immunity to RSV by impairing recruitment of DC.

European Journal of Immunology
Lara E KallalNicholas W Lukacs

Abstract

Chemokines are important mediators of the immune response to pathogens, but can also promote chronic inflammatory states. Chemokine receptor 6 (CCR6) is found on immature DC and effector/memory T cells, and binds a single ligand, CCL20, with high affinity. Here, we investigated the role of CCL20 and CCR6 in a pulmonary viral infection caused by RSV, a ubiquitous virus that can cause severe pulmonary complications. Neutralization of CCL20 during RSV infection significantly reduced lung pathology and favored a Th1 effector response. CCR6-deficient animals recapitulated this phenotype, and additionally showed enhanced viral clearance when compared with WT mice. No differences were observed in migration of T cells to the lungs of CCR6(-/-) animals; however, a significant reduction was observed in numbers of conventional DC (cDC), but not plasmacytoid DC, in CCR6(-/-) mice. A pathogenic phenotype could be reconstituted in CCR6(-/-) mice by supplying cDC into the airway, indicating that mere number of cDC dictates the adverse response. Our data suggest that blockade of the CCL20/CCR6 pathway provides an environment whereby the attenuated recruitment of cDC alters the balance of innate immune cells and mediates the efficient antiviral...Continue Reading

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