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

MyD88-dependent expansion of an immature GR-1(+)CD11b(+) population induces T cell suppression and Th2 polarization in sepsis.
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DOI:
10.1084/jem.20062602
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发表时间:
2007-06-11
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Moldawer LL
Moldawer LL
中科院分区:
其他
文献类型:
--
作者:
Delano MJ;Scumpia PO;Weinstein JS;Coco D;Nagaraj S;Kelly-Scumpia KM;O'Malley KA;Wynn JL;Antonenko S;Al-Quran SZ;Swan R;Chung CS;Atkinson MA;Ramphal R;Gabrilovich DI;Reeves WH;Ayala A;Phillips J;Laface D;Heyworth PG;Clare-Salzler M;Moldawer LL

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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.
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