Abstract
The SOX9 transcription factor ensures proper tissue development and homeostasis and has been implicated in promoting tumor progression. However, the role of SOX9 as a driver of lung adenocarcinoma (LUAD), or any cancer, remains unclear. Using CRISPR/Cas9 and Cre-LoxP gene knockout approaches in the KrasG12D-driven mouse LUAD model, we found that loss of Sox9 significantly reduces lung tumor development, burden and progression, contributing to significantly longer overall survival. SOX9 consistently drove organoid growth in vitro, but SOX9-promoted tumor growth was significantly attenuated in immunocompromised mice compared to syngeneic mice. We demonstrate that SOX9 suppresses immune cell infiltration and functionally suppresses tumor associated CD8+ T, natural killer and dendritic cells. These data were validated by flow cytometry, gene expression, RT-qPCR, and immunohistochemistry analyses in KrasG12D-driven murine LUAD, then confirmed by interrogating bulk and single-cell gene expression repertoires and immunohistochemistry in human LUAD. Notably, SOX9 significantly elevates collagen-related gene expression and substantially increases collagen fibers. We propose that SOX9 increases tumor stiffness and inhibits tumor-infiltrating dendritic cells, thereby suppressing CD8+ T cell and NK cell infiltration and activity. Thus, SOX9 drives KrasG12D-driven lung tumor progression and inhibits anti-tumor immunity at least partly by modulating the tumor microenvironment.
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The datasets generated during this study can be accessed here: https://doi.org/10.6084/m9.figshare.20810164.
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Acknowledgements
We thank Jia Peng for suggestions and discussions. We thank the Wenwei Hu laboratory for help with tissue sectioning and imaging. We thank Gina Castellano and Samantha Grabler for maintaining NSG mice for subcutaneous transplantation. We thank Lucyann Franciosa and Shafiq Bhat from CINJ histology laboratory for IHC staining. We thank Joshua Vieth and Shashi Sharma from the CINJ Immune Monitoring & Advanced Genomics core facility for the flow cytometry assay. Services and results in support of this research project were generated by the Rutgers Cancer Institute of New Jersey Histopathology and Immune Monitoring Shared Resources, supported, in part, with funding from NCI P30CA072720-5919. This work was supported by NCI R01CA190578 (SRP), R01CA237347-01A1 (JYG) and ACS 134036-RSG-19-165-01-TBG (JYG).
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HZ, HES and SRP conceptualized and directed the overall project; HZ, WL, YT, YW, JC, YK and SRP conceptualized and explained the suppression of anti-tumor immunity; HZ, designed and performed experiments, and analyzed RNA sequencing data; CW and MB generated KrasG12D mouse lung tumor cell lines; HZ, GR and SRP read tumor grades; TP performed pSECC guide RNA screening and provided pSECC plasmids; JYG proposed the mouse model; HZ, WL and SRP prepared figures; HZ and SRP wrote the manuscript; SRP and SG provided funding and research space; HZ, WL, JYG, YK, HES and SRP edited the manuscript.
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Zhong, H., Lu, W., Tang, Y. et al. SOX9 drives KRAS-induced lung adenocarcinoma progression and suppresses anti-tumor immunity. Oncogene 42, 2183–2194 (2023). https://doi.org/10.1038/s41388-023-02715-5
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DOI: https://doi.org/10.1038/s41388-023-02715-5