MyD88-dependent expansion of an immature GR-1 +CD11b+ population induces T cell suppression and Th2 polarization in sepsis

Matthew J. Delano, Philip O. Scumpia, Jason S. Weinstein, Dominique Coco, Srinivas Nagaraj, Kindra M. Kelly-Scumpia, Kerri A. O'Malley, James L. Wynn, Svetlana Antonenko, Samer Z. Al-Quran, Ryan Swan, Chun Shiang Chung, Mark A. Atkinson, Reuben Ramphal, Dmitry I. Gabrilovich, Wesley H. Reeves, Alfred Ayala, Joseph Phillips, Drake LaFace, Paul G. HeyworthMichael Clare-Salzler, Lyle L. Moldawer

Research output: Contribution to journalArticlepeer-review

541 Scopus citations


Polymicrobial sepsis alters the adaptive immune response and induces T cell suppression and Th2 immune polarization. We identify a GR-1 +CD11b+ population whose numbers dramatically increase and remain elevated in the spleen, lymph nodes, and bone marrow during polymicrobial sepsis. Phenotypically, these cells are heterogeneous, immature, predominantly myeloid progenitors that express interleukin 10 and several other cytokines and chemokines. Splenic GR-1+ cells effectively suppress antigen-specific CD8+ T cell interferon (IFN) γ production but only modestly suppress antigen-specific and nonspecific CD4+ T cell proliferation. GR-1+ cell depletion in vivo prevents both the sepsis-induced augmentation of Th2 cell-dependent and depression of Th1 cell-dependent antibody production. Signaling through MyD88, but not Toll-like receptor 4, TIR domain-containing adaptor-inducing IFN-β, or the IFN-α/β receptor, is required for complete GR-1+CD11b + expansion. GR-1+CD11b+ cells contribute to sepsis-induced T cell suppression and preferential Th2 polarization. JEM

Original languageEnglish (US)
Pages (from-to)1463-1474
Number of pages12
JournalJournal of Experimental Medicine
Issue number6
StatePublished - Jun 11 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Medicine(all)


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