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Ref Type Journal Article
PMID (21551259)
Authors Prazeres H, Couto JP, Rodrigues F, Vinagre J, Torres J, Trovisco V, Martins TC, Sobrinho-Simões M, Soares P
Title In vitro transforming potential, intracellular signaling properties, and sensitivity to a kinase inhibitor (sorafenib) of RET proto-oncogene variants Glu511Lys, Ser649Leu, and Arg886Trp.
Journal Endocrine-related cancer
Vol 18
Issue 4
Date 2011 Aug
URL
Abstract Text Multiple endocrine neoplasia type 2 and a subset of apparently sporadic medullary thyroid carcinoma (AS-MTC) are caused by germ line activating point mutations of the rearranged during transfection (RET) proto-oncogene. RET encodes a receptor with tyrosine kinase activity that targets several intracellular signaling cascades, such as RAS-RAF-ERK1/2, PIK3-AKT, and STAT transcription factors. The objective of this study was to assess the function of three germ line RET variants Arg886Trp, Ser649Leu, and Glu511Lys of undetermined pathogenic significance, which were found in three kindreds of isolated AS-MTC. For this purpose, we employed vectors expressing each of the RET variants and measured the number of NIH3T3 transformation foci and soft agar colonies, the degree of activation of known RET intracellular signaling targets (ERK1/2, STAT1, STAT3, and TCF4), and the extent of ERK1/2 inhibition on sorafenib treatment. We found that RET variants Arg886Trp and Glu511Lys have shown increased in vitro transforming potential in a glial-derived neurotrophic factor-dependent manner. In contrast, the Ser649Leu variant did not significantly increased the number of foci and agar colonies relative to wild-type RET (RET-WT). The variants Glu511Lys and Arg886Trp showed 10- and 12.5-fold ERK1/2 activation respectively, that was significantly higher than that observed for RET-WT (fivefold). Increased levels of STAT1 and TCF4 activation were only observed for RET Arg886Trp (2.5- and 3-fold versus 1.2- and 2-fold in RET-WT respectively). The three RET variants analyzed here were sensitive to treatment with sorafenib. In conclusion, our results allow to classify previously uncharacterized RET genotypes, which may be of use to define follow-up and therapeutic regimens.

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Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
RET R886W missense gain of function RET R886W lies within the protein kinase domain of the Ret protein (UniProt.org). R886W confers a gain of function to the Ret protein as demonstrated by increased Erk1/2, Stat1/3, and Tcf activation and transformation of cultured cells (PMID: 21551259).
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
RET R886W Advanced Solid Tumor sensitive Sorafenib Preclinical - Cell culture Actionable In a preclinical study, transformed cells expressing RET R886W were sensitive to treatment with Nexavar (sorafenib) in culture, demonstrating reduced cell proliferation (PMID: 21551259). 21551259