Abstract
STING is a pivotal mediator of effective innate and adaptive anti-tumor immunity; however, intratumoral administration of STING agonists have shown limited therapeutic benefit in clinical trials. The systemic effect of the intravenous delivery of STING agonists in cancer is not well-defined. Here, we demonstrated that systemic administration of STING agonist inhibited melanoma growth, improved inflammatory effector cell infiltration, and induced bone marrow mobilization and extramedullary hematopoiesis, causing widespread changes in immune components in the peripheral blood. The systemically administered STING agonist promoted HSC expansion and influenced lineage fate commitment, which was manifested as the differentiation of HSPCs was skewed toward myeloid cells at the expense of B-cell lymphopoiesis and erythropoiesis. Transcriptome analysis revealed upregulation of myeloid lineage differentiation-related and type I interferon-related genes. This myeloid-biased differentiation promoted the production and maturation of myeloid cells toward an activated phenotype. Furthermore, depletion of Gr-1+ myeloid cells attenuated the anti-tumor immunity of STING agonist. Our findings reveal the anti-tumor mechanism of systemic administration of STING agonist that involves modulating HSPC differentiation and promoting myeloid cells maturation. Our study may help explain the limited clinical activity of STING agonists administered intratumorally.
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Data availability
The Smart-seq2 transcriptome data were deposited in the Gene Expression Omnibus database (accession number GSE192927). All data generated or analyzed in this study were included in this article or in the supplementary information files.
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Acknowledgements
We thank Hui Xu and the Laboratory Animal Facility of Peking University Cancer Hospital and Institute for assistance with constructing the mouse model. We are grateful to Peking University Medical and Health Analysis Center for assistance with cell sorting. We also thank Tao Xu and Beijing Biokorad Biotechnology for assistance with FACS analysis, and Annoroad Gene Technology for assistance with transcriptome sequencing and analysis.
Funding
This work was funded by the National Natural Science Foundation of China to Jie Dai (82073011) and to Lu Si (82272676) and the Beijing Municipal Administration of Hospitals’ Ascent Plan to Jie Dai (QML20231107) and to Lu Si (DFL20220901).
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Conceptualization: TX, JD, LS, JG; data curation: TX, JD, LS, JG; formal analysis: TX, JD, LT, LS, LS, JG; methodology: TX, JD, LT, LS; investigation: TX, JD, LT, LS; supervision: JD, LS, JG; validation: TX, JD, LT, LS; original draft preparation: TX, JD; revision and editing: LT, LS, LS, JG.
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Xu, T., Dai, J., Tang, L. et al. Systemic administration of STING agonist promotes myeloid cells maturation and antitumor immunity through regulating hematopoietic stem and progenitor cell fate. Cancer Immunol Immunother 72, 3491–3505 (2023). https://doi.org/10.1007/s00262-023-03502-7
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DOI: https://doi.org/10.1007/s00262-023-03502-7