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• W1964369824 abstract "The precise role of STAT3 Ser727 phosphorylation in RET-mediated cell transformation and oncogenesis is not well understood. In this study, we have shown that familial medullary thyroid carcinoma (FMTC) mutants RETY791F and RETS891A induced, in addition to Tyr705 phosphorylation, constitutive STAT3 Ser727 phosphorylation. Using inhibitors and dominant negative constructs, we have demonstrated that RETY791F and RETS891A induce STAT3 Ser727 phosphorylation via a canonical Ras/ERK1/2 pathway and that integration of the Ras/ERK1/2/ELK-1 and STAT3 pathways was required for up-regulation of the c-fos promoter by FMTC-RET. Moreover, inhibition of ERK1/2 had a more severe effect on cell proliferation and cell phenotype in HEK293 cells expressing RETS891A compared with control and RETWT-transfected cells. The transforming activity of RETY791F and RETS891A in NIH-3T3 cells was also inhibited by U0126, indicating a role of the ERK1/2 pathway in RET-mediated transformation. To investigate the biological significance of Ras/ERK1/2-induced STAT3 Ser727 phosphorylation for cell proliferation and transformation, N-Ras-transformed NIH-3T3 cells were employed. These cells displayed elevated levels of activated ERK1/2 and Ser727-phosphorylated STAT3, which were inhibited by treatment with U0126. Importantly, overexpression of STAT3, in which the Ser727 was mutated into Ala (STAT3S727A), rescued the transformed phenotype of N-Ras-transformed cells. Immunohistochemistry in tumor samples from FMTC patients showed strong nuclear staining of phosphorylated ERK1/2 and Ser727 STAT3. These data show that FMTC-RET mutants activate a Ras/ERK1/2/STAT3 Ser727 pathway, which plays an important role in cell mitogenicity and transformation." @default.
• W1964369824 created "2016-06-24" @default.
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• W1964369824 date "2007-03-01" @default.
• W1964369824 modified "2023-09-27" @default.
• W1964369824 title "Ras/ERK1/2-mediated STAT3 Ser727 Phosphorylation by Familial Medullary Thyroid Carcinoma-associated RET Mutants Induces Full Activation of STAT3 and Is Required for c-fos Promoter Activation, Cell Mitogenicity, and Transformation" @default.
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• W1964369824 doi "https://doi.org/10.1074/jbc.m608952200" @default.
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