Innate Response Activator B Cells Protect Against Microbial Sepsis

Philipp J. Rauch(Harvard University), Aleksey Chudnovskiy(Harvard University), Clinton S. Robbins(Harvard University), Georg F. Weber(Harvard University), Martin Etzrodt(Harvard University), Ingo Hilgendorf(Harvard University), Elizabeth Tiglao(Harvard University), Jose‐Luiz Figueiredo(Harvard University), Yoshiko Iwamoto(Harvard University), Igor Theurl(Harvard University), Rostic Gorbatov(Harvard University), Michael T. Waring(Ragon Institute of MGH, MIT and Harvard), Adam Chicoine(Ragon Institute of MGH, MIT and Harvard), Majd Mouded(University of Pittsburgh), Mikaël J. Pittet(Harvard University), Matthias Nahrendorf(Harvard University), Ralph Weissleder(Harvard University), Filip K. Świrski(Harvard University)
Science
January 13, 2012
10.1126/science.1215173
Cited by 399Open Access
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Abstract

Immune Sentinels A classic paradigm in immunology holds that the immune response occurs in two waves: Rapidly responding cells of the innate immune system help to contain the invading pathogen and alert lymphocytes. These cells of the adaptive immune system then help to clear the infection and go on to form long-lasting memory. However, some specialized populations of lymphocytes can also respond quickly to an infection and carry out functions that overlap with the innate immune system. Now, Rauch et al. (p. 597 , published online 12 January) describe one such cell type—innate response activator (IRA) B cells. IRA B cells recognize bacterial liposaccharide through Toll-like receptor 4 and, in response, produce the cytokine GM-CSF, which activates other innate immune cells. Deletion of IRA B cells in mice impaired their ability to clear a bacterial infection and promoted septic shock.

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