Abstract
Regulatory T cells (Tregs) play a major role in the development of an immunosuppressive tumor microenvironment. Systemic Treg depletion is not favored because of the critical role of Tregs in maintaining immune homeostasis and preventing the autoimmunity. Recently, CCR8 has been identified as an important chemokine receptor expressed on intratumoral Tregs and is known to be critical for CCR8+Treg-mediated immunosuppression. However, the inherent molecular mechanisms and clinical significance of intratumoral CCR8+Tregs remain poorly understood. In this study, a retrospective analysis of 259 muscle-invasive bladder cancer (MIBC) patients from two independent clinic centers was conducted to explore the prognostic merit of CCR8+Tregs via immunohistochemistry. Eighty-three fresh MIBC samples and data from the Cancer Genome Atlas were used to evaluate the proportion and function of immune cells via flow cytometry, ex vivo intervention experiments and bioinformatics analysis. It was found that the CCR8 expression by intratumoral Tregs maintained the stability and potentiated their suppressive function by upregulating the expression of transcript factors FOXO1 and c-MAF. High level of CCR8+Tregs was associated with the immune tolerance and predicted poor survival and inferior therapeutic responsiveness to chemotherapy. Moreover, it was revealed that CCR8 blockade could destabilize intratumoral Tregs into a fragile phenotype accompanied with reactivation of antitumor immunity and augment of anti-PD-1 therapeutic benefits in MIBC. In summary, those results suggested that CCR8+Tregs represented a stable Treg subtype and a promising therapeutic target in the immunotherapy of MIBC.
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Abbreviations
- ACT:
-
Adjuvant chemotherapy
- CI:
-
Confidence interval
- FCM:
-
Flow cytometry
- FUSCC:
-
Fudan University Shanghai Cancer Center
- GSEA:
-
Gene set enrichment analysis
- HR:
-
Hazard ratio
- ICIs:
-
Immune-checkpoint inhibitors
- IF:
-
Immunofluorescence
- IHC:
-
Immunohistochemistry
- MIBC:
-
Muscle-invasive bladder cancer
- OS:
-
Overall survival
- PD-1:
-
Programmed cell death protein 1
- RC:
-
Radical cystectomy
- RFS:
-
Recurrence-free survival
- TCGA:
-
The Cancer Genome Atlas
- TMA:
-
Tissue microarray
- TME:
-
Tumor microenvironment
- Treg:
-
Regulatory T cell
- ZH:
-
Zhongshan Hospital
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Acknowledgements
We thank Dr. Lingli Chen (Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai, China) and Dr. Peipei Zhang (Department of Pathology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China) for their excellent pathological technology help.
Funding
This study was funded by grants from National Natural Science Foundation of China (81570607, 31770851, 81702496, 81702497, 81702805, 81772696, 81872082, 81902556, 81902563, 81902898, 81974393), three-year action plan for promoting clinical skills and clinical innovation in municipal hospitals of Shanghai Shenkang (16CR2003A), National Natural Science Foundation for Young Scholars of China (81902566), Shanghai Jiaotong University Medical-Engineering Cross Research Fund (YG2019QNA53), National Key R&D Program of China (2017YFC0114303), Shanghai Municipal Natural Science Foundation (16ZR1406500, 17ZR1405100, 19ZR1431800), Guide Project of Science and Technology Commission of Shanghai Municipality (17411963100), Shanghai Sailing Program (18YF1404500, 19YF1407900, 19YF1427200), Shanghai Municipal Commission of Health and Family Planning Program (20174Y0042, 201840168, 20184Y0151), Fudan University Shanghai Cancer Center for Outstanding Youth Scholars Foundation (YJYQ201802) and Shanghai Cancer Research Charity Center. All these study sponsors have no roles in the study design, in the collection, analysis and interpretation of data.
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TW, QZ, HZ and HZ for acquisition of data, analysis and interpretation of data, statistical analysis and drafting of the manuscript; ZL, JS, ZW, YX, JW, QB, YX, YW, LL, YZ, LX, BD and JG for technical and material support; YC, XW and JX for study concept and design, analysis and interpretation of data, drafting of the manuscript, obtained funding and study supervision. All authors read and approved the final manuscript.
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Wang, T., Zhou, Q., Zeng, H. et al. CCR8 blockade primes anti-tumor immunity through intratumoral regulatory T cells destabilization in muscle-invasive bladder cancer. Cancer Immunol Immunother 69, 1855–1867 (2020). https://doi.org/10.1007/s00262-020-02583-y
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DOI: https://doi.org/10.1007/s00262-020-02583-y