Abstract
Recognition and clearance of a bacterial infection are a fundamental properties of innate immunity. Here, we describe an effector B cell population that protects against microbial sepsis. Innate response activator (IRA) B cells are phenotypically and functionally distinct, develop and diverge from B1a B cells, depend on pattern-recognition receptors, and produce granulocyte-macrophage colony-stimulating factor. Specific deletion of IRA B cell activity impairs bacterial clearance, elicits a cytokine storm, and precipitates septic shock. These observations enrich our understanding of innate immunity, position IRA B cells as gatekeepers of bacterial infection, and identify new treatment avenues for infectious diseases.
MeSH Terms
Animals
B-Lymphocyte Subsets/immunology,metabolism
Cell Lineage
Cell Separation
Escherichia coli Infections/immunology
Female
Flow Cytometry
Granulocyte-Macrophage Colony-Stimulating Factor/immunology,metabolism
Immunity, Innate
Immunoglobulin M/metabolism
Immunophenotyping
Integrin alpha4beta1/immunology,metabolism
Lipopolysaccharides
Lymphocyte Activation
Lymphocyte Function-Associated Antigen-1/immunology,metabolism
Mice
Mice, Inbred C57BL
Parabiosis
Peritonitis/immunology
Sepsis/immunology
Shock, Septic/immunology
Spleen/immunology
Toll-Like Receptor 4/immunology
Chemicals
Immunoglobulin M
Integrin alpha4beta1
Lipopolysaccharides
Lymphocyte Function-Associated Antigen-1
Tlr4 protein, mouse
Toll-Like Receptor 4
Granulocyte-Macrophage Colony-Stimulating Factor
Authors & Affiliations
18 authors, click to expand affiliations / ORCID
Rauch Philipp J
Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA.
Chudnovskiy Aleksey
Robbins Clinton S
Weber Georg F
Etzrodt Martin
Hilgendorf Ingo
Tiglao Elizabeth
Figueiredo Jose-Luiz
Iwamoto Yoshiko
Theurl Igor
Gorbatov Rostic
Waring Michael T
Chicoine Adam T
Mouded Majd
Pittet Mikael J
Nahrendorf Matthias
Weissleder Ralph
Swirski Filip K
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