Abstract:
:High T-cell infiltration in colorectal cancer (CRC) correlates with a favorable disease outcome and immunotherapy response. This, however, is only observed in a small subset of CRC patients. A better understanding of the factors influencing tumor T-cell responses in CRC could inspire novel therapeutic approaches to achieve broader immunotherapy responsiveness. Here, we investigated T cell-suppressive properties of different myeloid cell types in an inducible colon tumor mouse model. The most potent inhibitors of T-cell activity were tumor-infiltrating neutrophils. Gene expression analysis and combined in vitro and in vivo tests indicated that T-cell suppression is mediated by neutrophil-secreted metalloproteinase activation of latent TGFβ. CRC patient neutrophils similarly suppressed T cells via TGFβ in vitro, and public gene expression datasets suggested that T-cell activity is lowest in CRCs with combined neutrophil infiltration and TGFβ activation. Thus, the interaction of neutrophils with a TGFβ-rich tumor microenvironment may represent a conserved immunosuppressive mechanism in CRC.
journal_name
EMBO Mol Medjournal_title
EMBO molecular medicineauthors
Germann M,Zangger N,Sauvain MO,Sempoux C,Bowler AD,Wirapati P,Kandalaft LE,Delorenzi M,Tejpar S,Coukos G,Radtke Fdoi
10.15252/emmm.201910681subject
Has Abstractpub_date
2020-01-09 00:00:00pages
e10681issue
1eissn
1757-4676issn
1757-4684journal_volume
12pub_type
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