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• W2142859819 abstract "Gastrointestinal stromal tumours (GIST) are mainly characterised by the presence of activating mutations in either of the two receptor tyrosine kinases c-KIT or platelet-derived growth factor receptor-α (PDGFRα). Most mechanistic studies dealing with GIST mutations have focused on c-KIT and far less is known about the signalling characteristics of the mutated PDGFRα proteins. Here, we study the signalling capacities and corresponding transcriptional responses of the different PDGFRα proteins under comparable genomic conditions. We demonstrate that the constitutive signalling via the oncogenic PDGFRα mutants favours a mislocalisation of the receptors and that this modifies the signalling characteristics of the mutated receptors. We show that signalling via the oncogenic PDGFRα mutants is not solely characterised by a constitutive activation of the conventional PDGFRα signalling pathways. In contrast to wild-type PDGFRα signal transduction, the activation of STAT factors (STAT1, STAT3 and STAT5) is an integral part of signalling mediated via mutated PDGF-receptors. Furthermore, this unconventional STAT activation by mutated PDGFRα is already initiated in the endoplasmic reticulum whereas the conventional signalling pathways rather require cell surface expression of the receptor. Finally, we demonstrate that the activation of STAT factors also translates into a biologic response as highlighted by the induction of STAT target genes. We show that the overall oncogenic response is the result of different signatures emanating from different cellular compartments. Furthermore, STAT mediated responses are an integral part of mutated PDGFRα signalling." @default.
• W2142859819 created "2016-06-24" @default.
• W2142859819 creator A5013957833 @default.
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• W2142859819 date "2015-03-31" @default.
• W2142859819 modified "2023-10-01" @default.
• W2142859819 title "Constitutive activation of oncogenic PDGFRα-mutant proteins occurring in GIST patients induces receptor mislocalisation and alters PDGFRα signalling characteristics" @default.
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• W2142859819 doi "https://doi.org/10.1186/s12964-015-0096-8" @default.
• W2142859819 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4396151" @default.
• W2142859819 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25880691" @default.
• W2142859819 hasPublicationYear "2015" @default.
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