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• W4384821695 abstract "Abstract RAC1 P29S is the third most prevalent hotspot mutation in sun-exposed melanoma. RAC1 alterations in cancer are correlated with poor prognosis, resistance to standard chemotherapy, and insensitivity to targeted inhibitors. Although RAC1 P29S mutations in melanoma and RAC1 alterations in several other cancers are increasingly evident, the RAC1-driven biological mechanisms contributing to tumorigenesis remain unclear. Lack of rigorous signaling analysis has prevented identification of alternative therapeutic targets for RAC1 P29S -harboring melanomas. To investigate the RAC1 P29S -driven effect on downstream molecular signaling pathways, we generated an inducible RAC1 P29S expression melanocytic cell line and performed RNA-sequencing (RNA-seq) coupled with multiplexed kinase inhibitor beads and mass spectrometry (MIBs/MS) to establish enriched pathways from the genomic to proteomic level. Our proteogenomic analysis identified CDK9 as a potential new and specific target in RAC1 P29S -mutant melanoma cells. In vitro , CDK9 inhibition impeded the proliferation of in RAC1 P29S -mutant melanoma cells and increased surface expression of PD-L1 and MHC Class I proteins. In vivo , combining CDK9 inhibition with anti-PD-1 immune checkpoint blockade significantly inhibited tumor growth only in melanomas that expressed the RAC1 P29S mutation. Collectively, these results establish CDK9 as a novel target in RAC1-driven melanoma that can further sensitize the tumor to anti-PD-1 immunotherapy." @default.
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• W4384821695 date "2023-07-19" @default.
• W4384821695 modified "2023-10-17" @default.
• W4384821695 title "Unique vulnerability of RAC1-mutant melanoma to combined inhibition of CDK9 and immune checkpoints" @default.
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• W4384821695 doi "https://doi.org/10.21203/rs.3.rs-3160616/v1" @default.
• W4384821695 hasPublicationYear "2023" @default.
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