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Title

SIX1 represses senescence and promotes SOX2-mediated cellular plasticity during tumorigenesis

AuthorsDe Lope, Cristina; Martín-Alonso, Samara; Auzmendi-Iriarte, Jaione; Escudero, Carmen; Mulet, Isabel; Larrasa-Alonso, Javier; López-Antona, Irene; Matheu, Ander; Palmero, Ignacio CSIC ORCID
Issue Date5-Feb-2019
PublisherNature Publishing Group
CitationScientific Reports 9(1): 1412 (2019)
AbstractSix1 is a developmental transcriptional regulator frequently overexpressed in human tumors. Recent results show that SIX1 also acts as a repressor of cell senescence, an antiproliferative response with a key role in tumor suppression, among other physiological and pathological settings. Here, we set to study the impact of SIX1 gain of function in transformation and tumorigenesis of fibroblasts, in connection with senescence. Using transcriptomic, histological, and functional analyses in murine tumors and cells of fibroblast origin, we show that SIX1 has a strong pro-tumorigenic action in this model, linked to the repression of a senescence-related gene signature and the induction of an undifferentiated phenotype mediated, at least in part, by the regulation of the stemness factor Sox2. Moreover, functional analyses with human glioma cell lines also show that SIX1 controls SOX2 expression, senescence and self-renewal in this model. Collectively, our results support a general link of SIX1 with senescence and SOX2-mediated cell plasticity in tumors.
Publisher version (URL)https://doi.org/10.1038/s41598-018-38176-0
URIhttp://hdl.handle.net/10261/176256
DOIhttp://dx.doi.org/10.1038/s41598-018-38176-0
E-ISSN2045-2322
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