Secretome Screening of BRAFV600E-Mutated Colon Cancer Cells Resistant to Vemurafenib
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Date
2023-04
Publication Type
Journal Article
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yes
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Abstract
Patients with metastatic colorectal cancer (mCRC) carrying BRAFV600E mutation have worse response to chemotherapy and poor prognosis. The BRAFV600E inhibitor vemurafenib has shown modest efficacy as monotherapy in BRAF-mutated mCRC due to the development of resistance. The aim of this study was to conduct a comparative proteomics profiling of the secretome from vemurafenib-sensitive vs. -resistant colon cancer cells harboring BRAFV600E mutation in order to identify specific secretory features potentially associated with changes in the resistant cells’ phenotype. Towards this aim, we employed two complementary proteomics approaches including two-dimensional gel electrophoresis coupled with MALDI-TOF/TOF mass spectrometry and label-free quantitative LC-MS/MS analysis. Obtained results pointed to aberrant regulation of DNA replication and endoplasmic reticulum stress as the major secretome features associated with chemoresistant phenotype. Accordingly, two proteins implicated in these processes including RPA1 and HSPA5/GRP78 were discussed in more details in the context of biological networks and their importance as potential secretome targets for further functional and clinical evaluation. Expression patterns of RPA1 and HSPA5/GRP78 in tumor tissues from colon cancer patients were also found in additional in silico analyses to be associated with BRAFV600E mutation status, which opens the possibility to extrapolate our findings and their clinical implication to other solid tumors harboring BRAFV600E mutation, such as melanoma.
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published
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Journal / series
Volume
12 (4)
Pages / Article No.
608
Publisher
MDPI
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Edition / version
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Date collected
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Subject
BRAFV600E; colon cancer; secretome; BRAF inhibition; vemurafenib; DNA replication; ER stress; RPA1; HSPA5/GRP78; chemoresistance
Organisational unit
02207 - Functional Genomics Center Zurich / Functional Genomics Center Zurich
Notes
Funding
823839 - European Proteomics Infrastructure Consortium providing Access (EC)