Abstract
Background
Sorafenib is the most widely used first-line treatment for patients with advanced hepatocellular carcinoma (HCC), but such treatment provides only limited survival benefits that might be related to the immune status of distinct tumor microenvironments. A fundamental understanding of the distribution and phenotypes of T lymphocytes in tumors will undoubtedly lead to the development of novel immunotherapeutic strategies that could possibly enhance the efficacy of sorafenib treatments.
Methods
Flow cytometry, immunohistochemistry and immunofluorescence analyses were performed to detect the infiltration and distribution of various leukocyte populations, and the expression of different immune checkpoint molecules in fresh HCC tumor tissues. Correlations among indicating genes were calculated in 365 patients with HCC from The Cancer Genome Atlas (TCGA) data set, and the cumulative overall survival time was calculated using the Kaplan–Meier method. Moreover, role of adenosinergic pathway on sorafenib anti-tumor efficacy was investigated using both subcutaneous and orthotopic transplantation tumor model in immune competent C57BL/6 mice.
Results
We revealed that levels of CD3+ and CD8+ T cells were significantly downregulated in HCC tumor tissue, so were the infiltration of CD169+ cells (a Mφ subpopulation with T cell activation capacities) and their contact with CD8+ cells in tumor milieus. Moreover, levels of PD-1 and CD39 expression were significantly upregulated in human HCC-infiltrating CD4+ and CD8+ T cells, and CD39+CD8+ T cells exhibited a CD69+PD-1+perforinlowIFNγlow “exhausted” phenotype. Levels of both CD39+ T cells infiltration and adenosine receptor ADORA2B expression in tumor tissues were negatively correlated with overall survival of patients with HCC. Accordingly, mice treated with sorafenib in combination with adenosine A2B receptor blockage reagents exhibited significantly reduced tumor progression compared with control groups.
Conclusions
These results suggest that adenosinergic pathway might represent an applicable target for sorafenib-combined-therapies in human HCC.
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Data availability
The publicly available microarray data sets analyzed in this study from The Cancer Genome Atlas (TCGA) were downloaded from the data portal of Genomic Data Commons (GDC, https://portal.gdc.cancer.gov/).
Abbreviations
- HCC:
-
Hepatocellular carcinoma
- FDA:
-
Food and Drug Administration
- PD-1:
-
Programmed cell death protein 1
- PD-L1:
-
Programmed death ligand 1
- CTLA-4:
-
Cytotoxic T-lymphocyte-associated protein 4
- tSNE:
-
T-distributed stochastic neighbor embedding
- DAPI:
-
Nuclei were stained with 4′,6-diamidino-2-phenylindole
- BFA:
-
Brefeldin A
- TCGA:
-
The Cancer Genome Atlas
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Funding
This work was supported by project grants from the National Natural Science Foundation of China (81773054 to Y.W., and 31900651 to J.L.), the National Key Research and Development Plan of China (2018ZX10302205 to L.Z.), the China Postdoctoral Science Foundation (2018M643302 to J.L.), and the Fundamental Research Funds for the Central Universities (171gjc32 to L.Z.).
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JL, YW, and LZ designed the experiments and analyzed the data. JL, DNZ, JZL, QMH, LYZ and YC performed the experiments. ZX, CH, KM, and WPW provided the reagents. JL and YW wrote the manuscript. YW and LZ supervised the project.
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All samples were anonymously coded in accord with local ethical guidelines (as stipulated by the Declaration of Helsinki) and with written informed consent. The Review Board of Sun Yat-sen University Cancer Center approved the study protocol. All animal procedures were performed in accordance with the experimental animal guidelines set by the Institutional Animal Care and Use Committee of Sun Yat-sen University Cancer Center (L102012018120M).
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Liao, J., Zeng, DN., Li, JZ. et al. Targeting adenosinergic pathway enhances the anti-tumor efficacy of sorafenib in hepatocellular carcinoma. Hepatol Int 14, 80–95 (2020). https://doi.org/10.1007/s12072-019-10003-2
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DOI: https://doi.org/10.1007/s12072-019-10003-2