Abstract
Purpose
Uveal melanoma (UM) is the most common intraocular malignant tumor in adults. Due to the lack of effective treatments for metastatic UM, the survival of UM has not changed over the past 3 decades. Therefore, it is important to identify essential genes regulating the metastasis of UM.
Methods
In this study, a genome-wide CRISPR knockout screen in an orthotopic mouse model of UM was performed to identify the regulatory genes conferring the metastatic phenotype. Loss-of-function analyses were performed to explore the function of G protein pathway suppressor 2 (GPS2) in UM metastasis in vitro and in vivo. RNA sequencing was performed to investigate the molecular mechanism underlying the function of GPS2 as a tumor suppressor in UM.
Results
Among the highest-ranking genes, we found several validated tumor suppressors, such as SHPRH, GPS2, PRPH2, and hsa-mir-1229; GPS2 was chosen as the candidate gene for further studies. GPS2 was lower expressed in the tumor tissues of UM patients. Furthermore, knocking-down GPS2 promoted the proliferation and metastatic abilities of UM cells both in vivo and in vitro. Finally, analysis of the transcriptome data revealed that silencing GPS2 upregulates oncogenic signaling pathways MAPK and PI3K-Akt, and in the meantime downregulates tumor suppressor signaling pathway Slit/Robo in UM cells.
Conclusion
Altogether, our study proved that the GPS2 gene functions as a tumor suppressor and might be a novel potential therapeutic target for UM treatment.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We would like to thank the professors of the School of Medicine, Nankai University, for their kind support in writing this research paper.
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This work was supported by the Science and Technology Project of the Health Committee of Binhai New Area (2019BWKZ009).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by SS and HC. TW contributed to the design of this study. HW and JW were involved in the animal experiments. The first draft of the manuscript was written by FS and LW, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Supplementary file1: Representative H&E-stained sections of the liver, brain, and spleen of BALB/C nude mice orthotopically transplanted with the indicated OCM1 cells. (TIF 2982 KB)
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Shi, S., Chen, H., Wang, H. et al. Genome-wide CRISPR knockout screening identified G protein pathway suppressor 2 as a novel tumor suppressor for uveal melanoma metastasis. J Cancer Res Clin Oncol 149, 3349–3360 (2023). https://doi.org/10.1007/s00432-022-04160-5
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DOI: https://doi.org/10.1007/s00432-022-04160-5