Systematic name M6577
Brief description Genes up-regulated in ITGAM+ [GeneID=3684] cells (incubated for 24h in complete medium) from spleen: healthy versus tumor bearing mice.
Full description or abstract Active suppression of tumor-specific T lymphocytes can limit the immune-surveillance and immunotherapy efficacy. While tumor-recruited CD11b+ myeloid cells are known mediators of tumor-associated immune dysfunction, the true nature of these suppressive cells and the fine biochemical pathways governing their immunosuppressive activity remain elusive. Here we describe a population of circulating CD11b+/IL-4R?+, inflammatory-type monocytes that is elicited by growing tumors and activated by IFN-? released from T lymphocytes. CD11b+/IL-4R?+ cells produce IL-13 and IFN-? and integrate the downstream signals of these cytokines to trigger the molecular pathways suppressing antigen-activated CD8+ T lymphocytes. Analogous immunosuppressive circuits are active in CD11b+ cells present within the tumor microenvironment. These suppressor cells challenge the current idea that tumor-conditioned immunosuppressive monocytes/macrophages are alternatively activated. Moreover, our data show how the inflammatory response elicited by tumors has detrimental effects on the adaptive immune system and suggest novel approaches for the treatment of tumorinduced immune dysfunctions.
Collection C7: Immunologic Signature
      IMMUNESIGDB: ImmuneSigDB
Source publication Pubmed 17016559   Authors: Gallina G,Dolcetti L,Serafini P,De Santo C,Marigo I,Colombo MP,Basso G,Brombacher F,Borrello I,Zanovello P,Bicciato S,Bronte V
Exact source GSE5455_2446_200_UP
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Source species Mus musculus
Contributed by Jernej Godec (Dana-Farber Cancer Institute)
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Version history 7.3: Moved to ImmuneSigDB sub-collection.

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