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Adaptive plasticity of IL-10⁺ and IL-35⁺ T_reg cells cooperatively promotes tumor T cell exhaustion.

ABSTRACT: Regulatory T cells (T_reg cells) maintain host self-tolerance but are a major barrier to effective cancer immunotherapy. T_reg cells subvert beneficial anti-tumor immunity by modulating inhibitory receptor expression on tumor-infiltrating lymphocytes (TILs); however, the underlying mediators and mechanisms have remained elusive. Here, we found that the cytokines IL-10 and IL-35 (Ebi3-IL-12α heterodimer) were divergently expressed by T_reg cell subpopulations in the tumor microenvironment (TME) and cooperatively promoted intratumoral T cell exhaustion by modulating several inhibitory receptor expression and exhaustion-associated transcriptomic signature of CD8⁺ TILs. While expression of BLIMP1 (encoded by Prdm1) was a common target, IL-10 and IL-35 differentially affected effector T cell versus memory T cell fates, respectively, highlighting their differential, partially overlapping but non-redundant regulation of anti-tumor immunity. Our results reveal previously unappreciated cooperative roles for T_reg cell-derived IL-10 and IL-35 in promoting BLIMP1-dependent exhaustion of CD8⁺ TILs that limits effective anti-tumor immunity.

SUBMITTER: Sawant DV

PROVIDER: S-EPMC6531353 | biostudies-literature |

REPOSITORIES: biostudies-literature

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