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Wang, David; Quiros, Jason; Mahuron, Kelly; Pai, Chien-Chun; Ranzani, Valeria; Young, Arabella; Silveria, Stephanie; Harwin, Tory; Abnousian, Arbi; Pagani, Massimiliano; Rosenblum, Michael D.; Van Gool, Frederic; Fong, Lawrence; Bluestone, Jeffrey A.; DuPage, Michel
Cell reports (Cambridge), 06/2018, Volume: 23, Issue: 11Journal Article
Regulatory T cells (Tregs) are critical for maintaining immune homeostasis, but their presence in tumor tissues impairs anti-tumor immunity and portends poor prognoses in cancer patients. Here, we reveal a mechanism to selectively target and reprogram the function of tumor-infiltrating Tregs (TI-Tregs) by exploiting their dependency on the histone H3K27 methyltransferase enhancer of zeste homolog 2 (EZH2) in tumors. Disruption of EZH2 activity in Tregs, either pharmacologically or genetically, drove the acquisition of pro-inflammatory functions in TI-Tregs, remodeling the tumor microenvironment and enhancing the recruitment and function of CD8+ and CD4+ effector T cells that eliminate tumors. Moreover, abolishing EZH2 function in Tregs was mechanistically distinct from, more potent than, and less toxic than a generalized Treg depletion approach. This study reveals a strategy to target Tregs in cancer that mitigates autoimmunity by reprogramming their function in tumors to enhance anti-cancer immunity. Display omitted •EZH2 expression is elevated in tumor-infiltrating (TI) Tregs•Pharmacological inhibition of EZH2 destabilizes FOXP3 expression and slows tumor growth•Genetic disruption of Ezh2 function in Tregs leads to robust anti-tumor immunity•Blockade of EZH2 in Tregs reprograms TI-Tregs to gain pro-inflammatory activity EZH2 plays an intrinsic role in neoplastic cells as an oncogene, prompting the development of EZH2 inhibitors for cancer therapy. Wang et al. show that disrupting EZH2 function also has immunomodulatory activities and, when blocked in Tregs, promotes potent cancer immunity.
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