Inhibition of STAT3 augments antitumor efficacy of anti-CTLA-4 treatment against prostate cancer
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Published:2021-03-31
Issue:11
Volume:70
Page:3155-3166
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ISSN:0340-7004
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Container-title:Cancer Immunology, Immunotherapy
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language:en
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Short-container-title:Cancer Immunol Immunother
Author:
Witt Kristina, Evans-Axelsson Susan, Lundqvist Andreas, Johansson Martin, Bjartell Anders, Hellsten RebeckaORCID
Abstract
AbstractThere is an urgent need for new treatment options in metastatic drug-resistant prostate cancer. Combining immunotherapy with other targeted therapies may be an effective strategy for advanced prostate cancer. In the present study, we sought to investigate to enhance the efficacy of anti-CTLA-4 therapy against prostate cancer by the combination with STAT3 inhibition.Male C57BL6 mice were subcutaneously inoculated with the murine prostate cancer cell line RM-1. Tumor progression was monitored following treatment with vehicle, the small molecule STAT3 inhibitor GPB730, anti-CTLA-4 or GPB730 + anti-CTLA-4. Treatment with anti-CTLA-4 or anti-CTLA-4 + GPB730 significantly inhibited tumor growth and enhanced survival compared to vehicle. Combining anti-CTLA-4 treatment with GPB730 resulted in a significantly prolonged survival compared to anti-CTLA-4 alone. GPB730 significantly increased infiltration of CD45 + cells in tumors of anti-CTLA-4-treated mice compared to anti-CTLA-4 alone. The levels of tumor-infiltrating Tregs were significantly decreased and the CD8:Treg ratio significantly increased by GPB730 treatment in combination with anti-CTLA-4 compared to anti-CTLA-4 alone. Immunohistochemical analysis showed a significant increase in CD45-positive cells in anti-CTLA-4 and anti-CTLA-4 + GPB730-treated tumors compared to vehicle or GPB730 monotherapy. Plasma levels of IL10 were significantly increased by anti-CTLA-4 compared to vehicle but no increase was observed when combining anti-CTLA-4 with GPB730.In conclusion, STAT3 inhibition by GPB730 enhances the antitumoral activity of anti-CTLA-4 and decreases the intratumoral Treg frequency in a prostate cancer mouse model. These results support the combination of STAT3 inhibition with anti-CTLA-4 therapy to increase clinical responses in patients with prostate cancer.
Funder
The Swedish Research Council The Swedish Cancer Society The Cancer Foundation at Skåne University Hospital Malmö The Governmental Funding (ALF) through The Faculty of Medicine The Prostate Cancer Patient Association in Sweden The Cancer Research Foundations of Radiumhemmet VINNOVA Lund University
Publisher
Springer Science and Business Media LLC
Subject
Cancer Research,Oncology,Immunology,Immunology and Allergy
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