Rapalogs Efficacy Relies on the Modulation of Antitumor T-cell Immunity

Abstract : The rapalogs everolimus and temsirolimus that inhibit mTOR signaling are used as antiproliferative drugs in several cancers. Here we investigated the influence of rapalogs-mediated immune modulation on their antitumor efficacy. Studies in metastatic renal cell carcinoma patients showed that everolimus promoted high expansion of FoxP3 (+)Helios(+)Ki67(+) regulatory CD4 T cells (Tregs). In these patients, rapalogs strongly enhanced the suppressive functions of Tregs, mainly in a contact-dependent manner. Paradoxically, a concurrent activation of spontaneous tumor-specific Th1 immunity also occurred. Furthermore, a high rate of Eomes(+)CD8(+) T cells was detected in patients after a long-term mTOR inhibition. We found that early changes in the Tregs/antitumor Th1 balance can differentially shape the treatment efficacy. Patients presenting a shift toward decreased Tregs levels and high expansion of antitumor Th1 cells showed better clinical responses. Studies conducted in tumor-bearing mice confirmed the deleterious effect of rapalogs-induced Tregs via a mechanism involving the inhibition of antitumor T-cell immunity. Consequently, the combination of temsirolimus plus CCR4 antagonist, a receptor highly expressed on rapalogs-exposed Tregs, was more effective than monotherapy. Altogether, our results describe for the first time a dual impact of host adaptive antitumor T-cell immunity on the clinical effectiveness of rapalogs and prompt their association with immunotherapies. Cancer Res; 76(14); 4100-12. ©2016 AACR.
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Soumis le : lundi 23 septembre 2019 - 13:56:53
Dernière modification le : mercredi 25 septembre 2019 - 01:28:09

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Laurent Beziaud, Laura Mansi, Patrice Ravel, Elodie Lauret Marie-Joseph, Caroline Laheurte, et al.. Rapalogs Efficacy Relies on the Modulation of Antitumor T-cell Immunity. Cancer Research, American Association for Cancer Research, 2016, 76 (14), pp.4100-4112. ⟨10.1158/0008-5472.CAN-15-2452⟩. ⟨hal-02294356⟩

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