Abstract
Background
Tumor cells continue to evolve the metastatic potential in response to signals provided by the external microenvironment during metastasis. Platelets closely interact with tumor cells during hematogenous metastasis and facilitate tumor development. However, the molecular mechanisms underlying this process are not fully understood.
Methods
RNA-sequencing was performed to screen differentially expressed genes mediated by platelets. The effects of platelet and CD39 on tumor metastasis were determined by experimental metastasis models with WT, NCG and CD39−/− mice.
Results
RNA-sequencing results showed that platelets significantly up-regulated CD39 expression in tumor cells. CD39 is a novel immune checkpoint molecule and a key driver of immunosuppression. Our data provided evidence that the expression of CD39 was enhanced by platelets in a platelet-tumor cell contact dependent manner. Although the role of CD39 expressed by immune cells is well established, the effect of CD39 expressed by tumor cells on tumor cell behavior, anti-tumor immunity and tumor metastasis is unclear. We found that CD39 promoted tumor cell invasion, but had no effect on proliferation and migration. Notably, we showed that the ability of platelets to prime tumor cells for metastasis depends on CD39 in the experimental tumor metastasis model. CD39 silencing resulted in fewer experimental metastasis formation, and this anti-metastasis effect was significantly reduced in platelet-depleted mice. Furthermore, overexpression of CD39 in tumor cells promoted metastasis. In order to eliminate the effect of CD39 expressed in cells other than tumor cells, we detected tumor metastasis in CD39−/− mice and obtained similar results. Moreover, overexpression of CD39 in tumor cells inhibited antitumor immunity. Finally, the data from human samples also supported our findings.
Conclusions
Our study shows that direct contact with platelets induces CD39 expression in tumor cells, leading to immune suppression and promotion of metastasis.
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Data availability
All data generated or analyzed during this study are available from the corresponding author on reasonable request. The RNA sequencing data have been deposited in the NCBI Sequence Read Archive (SRA) database under the accession number PRJNA1056323 and PRJNA1066901.
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Acknowledgements
We thank the members of Institute of Immunology and Molecular Medicine for discussions and technical help; Wei Wang and Yuzhong Wang for their assistance in tumor tissues collection.
Funding
The present study was funded by the National Natural Science Foundation of China (82003027, 81874169, 82171810), Doctoral Startup Fund of Jining Medical University (2017JYQD24). Grants from Tai Shan Young Scholar Foundation of Shandong Province (tsqn202211234). Project of Shandong Province Higher Educational Youth Innovation Science and Technology Program (2021KJ074).
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Zhaochen Ning led the main research work. Keyan Liu, Hui Zhang and Xiaotong Wang participated in discussions on study design, analysis, and interpretation. Guanjun Dong contributed to revise the manuscript. Huabao Xiong contributed to the overall design and guidance of the study.
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The authors declare no competing interests.
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All experiments involving animals were approved by the Medical Animal Care & Welfare Committee of Jining Medical University. Human tissue samples were acquired following the relevant guidelines and regulations approved by the Ethics Committee of the Affiliated Hospital of Jining Medical University. Informed consent was obtained from all individual participants included in the study.
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Ning, Z., Liu, K., Zhang, H. et al. Platelets induce CD39 expression in tumor cells to facilitate tumor metastasis. Br J Cancer (2024). https://doi.org/10.1038/s41416-024-02640-8
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DOI: https://doi.org/10.1038/s41416-024-02640-8