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Myeloid cell subsets that express latency-associated peptide promote cancer growth by modulating T cells


ABSTRACT: Summary Myeloid suppressor cells promote tumor growth by a variety of mechanisms which are not fully characterized. We identified myeloid cells (MCs) expressing the latency-associated peptide (LAP) of TGF-β on their surface and LAPHi MCs that stimulate Foxp3+ Tregs while inhibiting effector T cell proliferation and function. Blocking TGF-β inhibits the tolerogenic ability of LAPHi MCs. Furthermore, adoptive transfer of LAPHi MCs promotes Treg accumulation and tumor growth in vivo. Conversely, anti-LAP antibody, which reduces LAPHi MCs, slows cancer progression. Single-cell RNA-Seq analysis on tumor-derived immune cells revealed LAPHi dominated cell subsets with distinct immunosuppressive signatures, including those with high levels of MHCII and PD-L1 genes. Analogous to mice, LAP is expressed on myeloid suppressor cells in humans, and these cells are increased in glioma patients. Thus, our results identify a previously unknown function by which LAPHi MCs promote tumor growth and offer therapeutic intervention to target these cells in cancer. Graphical abstract Highlights • Several myeloid cell subsets express surface LAP• Myeloid cells that express surface LAP possess immunosuppressive properties• LAP expressing myeloid cells induce Tregs and inhibit effector T cell function• LAP expressing myeloid cells promote tumor growth Immunology; Cancer

SUBMITTER: Gabriely G 

PROVIDER: S-EPMC8602030 | biostudies-literature |

REPOSITORIES: biostudies-literature

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