A TNF-α–CCL20–CCR6 Axis Regulates Nod1-Induced B Cell Responses
pmid: 24534531
A TNF-α–CCL20–CCR6 Axis Regulates Nod1-Induced B Cell Responses
Abstract Innate immune responses provoke the accumulation of leukocytes at sites of inflammation. In addition to monocytes and granulocytes, B cells also participate in antimicrobial innate immune responses; however, the mechanisms for accumulation of B cells to sites of inflammation are not well understood. To study B cell accumulation following systemic inflammation, we used a model synthetic ligand that stimulates a specific pattern recognition molecule, nucleotide-binding oligomerization domain–containing protein 1 (Nod1). Upon exposure to Nod1 agonists, both B cells and neutrophils rapidly accumulate within the spleen, and dendritic cells migrate into the periarterial lymphoid sheath. Nod1 stimulation led to a marked increase in several chemokines within the spleen, including CXCL13, CCL2, and CCL20. Whereas the lymphotoxin pathway was critical for the induction of the B cell chemoattractant CXCL13 in response to Nod1 agonists, B cell accumulation within the spleen following Nod1-induced systemic inflammation was independent of the lymphotoxin pathway. In contrast, a CCR6/CCL20 chemokine loop instructed rapid increase of B cells in the spleen in response to systemic administration of Nod1 agonists in a TNF-α–dependent manner. Moreover, CCR6 was required to regulate Nod1-mediated B cell responses. These results reveal a novel mechanism of B cells during inflammation and shed light on how B cells participate in innate immune responses to microbial stimulation.
- University of Toronto Canada
- McGill University Canada
Male, Mice, Knockout, Receptors, CCR6, B-Lymphocytes, Chemokine CCL20, Lymphoid Tissue, Neutrophils, Bone Marrow Cells, Diaminopimelic Acid, Flow Cytometry, Cell Line, Mice, Inbred C57BL, Mice, Microscopy, Fluorescence, Nod1 Signaling Adaptor Protein, Animals, Female, Lymphocyte Count, Cells, Cultured, Bone Marrow Transplantation
Male, Mice, Knockout, Receptors, CCR6, B-Lymphocytes, Chemokine CCL20, Lymphoid Tissue, Neutrophils, Bone Marrow Cells, Diaminopimelic Acid, Flow Cytometry, Cell Line, Mice, Inbred C57BL, Mice, Microscopy, Fluorescence, Nod1 Signaling Adaptor Protein, Animals, Female, Lymphocyte Count, Cells, Cultured, Bone Marrow Transplantation
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