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Quantitative proteomics to study a small molecule targeting the loss of von Hippel–Lindau in renal cell carcinomas
Author(s) -
Bouhamdani Nadia,
Joy Andrew,
Barnett David,
Cormier Kevin,
Léger Daniel,
Chute Ian C.,
Lamarre Simon,
Ouellette Rodney,
Turcotte Sandra
Publication year - 2017
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.30774
Subject(s) - stable isotope labeling by amino acids in cell culture , cancer research , proteomics , mtorc1 , biology , small molecule , signal transduction , quantitative proteomics , renal cell carcinoma , mdm2 , pi3k/akt/mtor pathway , microbiology and biotechnology , medicine , gene , genetics
Inactivation of the tumor suppressor gene, von Hippel–Lindau (VHL), is known to play an important role in the development of sporadic clear cell renal cell carcinomas (ccRCCs). Even if available targeted therapies for metastatic RCCs (mRCCs) have helped to improve progression‐free survival rates, they have no durable clinical response. We have previously shown the feasibility of specifically targeting the loss of VHL with the identification of a small molecule, STF‐62247. Understanding its functionality is crucial for developing durable personalized therapeutic agents differing from those available targeting hypoxia inducible factor (HIF‐) pathways. By using SILAC proteomics, we identified 755 deregulated proteins in response to STF‐62247 that were further analyzed by ingenuity pathway analysis (IPA). Bioinformatics analyses predicted alterations in 37 signaling pathways in VHL‐null cells in response to treatment. Validation of some altered pathways shows that STF‐62247's selectivity is linked to an important inhibition of mTORC1 activation in VHL‐null cells leading to protein synthesis arrest, a mechanism differing from two allosteric inhibitors Rapamycin and Everolimus. Altogether, our study identified signaling cascades driving STF‐62247 response and brings further knowledge for this molecule that shows selectivity for the loss of VHL. The use of a global SILAC approach was successful in identifying novel affected signaling pathways that could be exploited for the development of new personalized therapeutic strategies to target VHL‐inactivated RCCs.