Abstract
Uveal melanoma (UM) is a currently untreatable form of melanoma with a 50% mortality rate. Characterization of the essential signaling pathways driving this cancer is critical to develop target therapies. Activating mutations in the Gαq signaling pathway at the level of GNAQ, GNA11, or rarely CYSLTR2 or PLCβ4 are considered alterations driving proliferation in UM and several other neoplastic disorders. Here, we systematically examined the oncogenic signaling output of various mutations recurrently identified in human tumors. We demonstrate that CYSLTR2 → GNAQ/11 → PLCβ act in a linear signaling cascade that, via protein kinase C (PKC), activates in parallel the MAP-kinase and FAK/Yes-associated protein pathways. Using genetic ablation and pharmacological inhibition, we show that the PKC/RasGRP3/MAPK signaling branch is the essential component that drives the proliferation of UM. Only inhibition of the MAPK branch but not the FAK branch synergizes with inhibition of the proximal cascade, providing a blueprint for combination therapy. All oncogenic signaling could be extinguished by the novel GNAQ/11 inhibitor YM-254890, in all UM cells with driver mutation in the Gαq subunit or the upstream receptor. Our findings highlight the GNAQ/11 → PLCβ → PKC → MAPK pathway as the central signaling axis to be suppressed pharmacologically to treat for neoplastic disorders with Gαq pathway mutations.
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Acknowledgements
This work was supported by R35 grant CA220481 and R01 grant CA142873 from the National Cancer Institute and the Gerson and Barbara Baker Distinguished Professorship (all to BCB). We thank Han Yue for providing help for IP1 assay. We thank the Preclinical Therapeutics, Laboratory for Cell Analysis of University of California, San Francisco for technical support and analyses.
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BCB and XC supervised the study and wrote the paper. JM and XC performed all experiments except YAP1 CRSPR/Cas9 knockout was performed by LW. All authors reviewed the paper.
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Ma, J., Weng, L., Bastian, B.C. et al. Functional characterization of uveal melanoma oncogenes. Oncogene 40, 806–820 (2021). https://doi.org/10.1038/s41388-020-01569-5
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DOI: https://doi.org/10.1038/s41388-020-01569-5
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