Intermittent Drug Treatment of BRAFV600E Melanoma Cells Delays Resistance by Sensitizing Cells to Rechallenge
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ABSTRACT:
PROVIDER: PRJNA481166 | ENA |
REPOSITORIES: ENA
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Project description:Melanoma patients receiving drugs targeting BRAFV600E and MKK1/2 invariably develop resistance and continue progression, limiting the efficacy of treatment. As an alternative to continuous dosing schedules, intermittent treatment strategies involving intervening periods of drug withdrawal have been proposed to delay resistance. The efficacy of this treatment strategy has been supported by preclinical findings and several clinical case reports. The beneficial effect of intermittent treatment has been attributed to “drug addiction”, in which the cell viability of resistant cells is compromised during periods of drug removal, presumably due to MAPK pathway hyperactivation. However, the cellular and molecular responses to intermittent treatment are still incompletely understood. Here, we investigate effects of intermittent treatment with the BRAFV600E inhibitor, encorafenib, in a metastatic melanoma cell line engineered to express genes conferring resistance to BRAF inhibition. We show that intermittent treatment shows superior growth suppression compared to continuous treatment for resistant cells that substantially reactivate the MAPK pathway. While drug addiction is clearly observable in these cells, it fails to account for the advantageous effects of intermittent treatment. Instead, growth suppression can mainly be explained by resensitization as most cell death is observed upon readdition of drug following periods of drug removal. Gene expression analysis shows that a unique and reversible transcriptional state is induced in intermittently treated cells following periods of drug removal. Thus, we conclude that the beneficial effects of intermittent treatment in our model are best explained by adaptive, non-mutational changes in transcription which confer drug resensitization.
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Project description:Vemurafenib is a BRAF inhibitor with specificity for the most common BRAF mutant encountered in melanomas (BRAFV600E). Vemurafenib suppresses the proliferation of BRAF mutant human melanoma cells by suppressing downstream activation of the MEK/ERK mitogen activated protein kinases. We used microarrays to examine the transcriptional response of a vemurafenib-sensitive BRAFV600E human melanoma cell line (A375) to vemurafenib in order to further delineate the mechanisms by which BRAFV600E drives cell proliferation and energy metabolism in human melanoma. BRAFV600E A375 human melanoma cells were treated with vehicle (0.1% DMSO) or 10 uM vemurafenib for 24 h after which total RNA was extracted. Cells were prepared and RNA was extracted in 3 separate batches (three different cell stocks on three separate days) providing three independent replicates (n=3). Paired replicates (prepared from the same stock of cells on the same day) are denoted by A, B and C.
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Project description:Oncoproteins such as the BRAFV600E kinase entrust cancer cells with malignant properties, but they also create unique vulnerabilies. Therapeutic targeting of the BRAFV600E-driven cytoplasmic signaling network has proven ineffective, since patients regularly relapse with reactivation of the targeted signaling pathways. Here, we identified the nuclear protein SFPQ to be synthetically lethal with BRAFV600E in a loss-of-function shRNA screen. SFPQ depletion decreased proliferation and induced apoptosis in BRAFV600E-driven colorectal and melanoma cells, and reduced tumor growth in xenografts. Mechanistically, SFPQ loss in BRAF-mutant cancer cells triggered the Chk1-dependent replication checkpoint, resulting in replication stress in the absence of overt DNA damage. Affected cells stalled in S-Phase with hallmark signs of impaired replication factories. Induction of BRAFV600E and concomitant loss of SFPQ sensitized cells to a combination of DNA replication checkpoint inhibitors and chemically induced replication stress, pointing towards future therapeutic approaches exploiting nuclear vulnerabilities induced by BRAFV600E.
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Project description:Oncoproteins such as the BRAFV600E kinase entrust cancer cells with malignant properties, but they also create unique vulnerabilies. Therapeutic targeting of the BRAFV600E-driven cytoplasmic signaling network has proven ineffective, since patients regularly relapse with reactivation of the targeted signaling pathways. Here, we identified the nuclear protein SFPQ to be synthetically lethal with BRAFV600E in a loss-of-function shRNA screen. SFPQ depletion decreased proliferation and induced apoptosis in BRAFV600E-driven colorectal and melanoma cells, and reduced tumor growth in xenografts. Mechanistically, SFPQ loss in BRAF-mutant cancer cells triggered the Chk1-dependent replication checkpoint, resulting in replication stress in the absence of overt DNA damage. Affected cells stalled in S-Phase with hallmark signs of impaired replication factories. Induction of BRAFV600E and concomitant loss of SFPQ sensitized cells to a combination of DNA replication checkpoint inhibitors and chemically induced replication stress, pointing towards future therapeutic approaches exploiting nuclear vulnerabilities induced by BRAFV600E.
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Project description:Vemurafenib is a BRAF inhibitor with specificity for the most common BRAF mutant encountered in melanomas (BRAFV600E). Vemurafenib suppresses the proliferation of BRAF mutant human melanoma cells by suppressing downstream activation of the MEK/ERK mitogen activated protein kinases. We used microarrays to examine the transcriptional response of a vemurafenib-sensitive BRAFV600E human melanoma cell line (A375) to vemurafenib in order to further delineate the mechanisms by which BRAFV600E drives cell proliferation and energy metabolism in human melanoma.
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Project description:In spite of the advancements in targeted therapy for BRAFV600E-mutated metastatic colorectal cancer (mCRC), the development of resistance to BRAFV600E inhibition limits the response rate and durability of the treatment. Better understanding of the resistance mechanisms to BRAF inhibitors will facilitate the design of novel pharmacological strategies for BRAF-mutated mCRC. The aim of this study was to identify novel protein candidates involved in acquired resistance to BRAFV600E inhibitor vemurafenib in BRAFV600E-mutated colon cancer cells using an integrated proteomics approach. Our study suggests a role of ezrin in acquired resistance to vemurafenib in colon cancer and melanoma cells carrying BRAFV600E mutation and supports further pre-clinical and clinical studies to explore the benefits of combined BRAF inhibitors and actin-targeting drugs as a potential therapeutic approach for BRAFV600E-mutated cancers.
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