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

ABSTRACT: 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 LAP^Hi MCs that stimulate Foxp3⁺ Tregs while inhibiting effector T cell proliferation and function. Blocking TGF-β inhibits the tolerogenic ability of LAP^Hi MCs. Furthermore, adoptive transfer of LAP^Hi MCs promotes Treg accumulation and tumor growth in vivo. Conversely, anti-LAP antibody, which reduces LAP^Hi MCs, slows cancer progression. Single-cell RNA-Seq analysis on tumor-derived immune cells revealed LAP^Hi dominated cell subsets with distinct immunosuppressive signatures, including those with high

SUBMITTER: Gabriely G 

PROVIDER: S-EPMC8602030 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature