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• W2911688003 abstract "Abstract In chronic lymphocytic leukemia (CLL), signaling through several prosurvival B cell surface receptors activates the PI3K signaling pathway. Idelalisib is a highly selective PI3K (PI3Kδ) isoform-specific inhibitor effective in relapsed/refractory CLL and follicular lymphoma. However, severe autoimmune adverse effects in association with the use of idelalisib in the treatment of CLL, particularly as a first-line therapy, gave indications that idelalisib may preferentially target the suppressive function of regulatory T cells (Tregs). On this background, we examined the effect of idelalisib on the function of human Tregs ex vivo with respect to proliferation, TCR signaling, phenotype, and suppressive function. Our results show that human Tregs are highly susceptible to PI3Kδ inactivation using idelalisib compared with CD4+ and CD8+ effector T cells (Teffs) as evident from effects on anti-CD3/CD28/CD2–induced proliferation (order of susceptibility [IC50]: Treg [.5 μM] &gt; CD4+ Teff [2.0 μM] &gt; CD8+ Teff [6.5 μM]) and acting at the level of AKT and NF-κB phosphorylation. Moreover, idelalisib treatment of Tregs altered their phenotype and reduced their suppressive function against CD4+ and CD8+ Teffs. Phenotyping Tregs from CLL patients treated with idelalisib supported our in vitro findings. Collectively, our data show that human Tregs are more dependent on PI3Kδ-mediated signaling compared with CD4+ and CD8+ Teffs. This Treg-preferential effect could explain why idelalisib produces adverse autoimmune effects by breaking Treg-mediated tolerance. However, balancing effects on Treg sensitivity versus CD8+ Teff insensitivity to idelalisib could still potentially be exploited to enhance inherent antitumor immune responses in patients." @default.
• W2911688003 created "2019-02-21" @default.
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• W2911688003 date "2019-03-01" @default.
• W2911688003 modified "2023-09-27" @default.
• W2911688003 title "The PI3K p110δ Isoform Inhibitor Idelalisib Preferentially Inhibits Human Regulatory T Cell Function" @default.
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• W2911688003 doi "https://doi.org/10.4049/jimmunol.1701703" @default.
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