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Kosnopfel, Corinna; Sinnberg, Tobias; Sauer, Birgit; Busch, Christian; Niessner, Heike; Schmitt, Anja; Forchhammer, Stephan; Grimmel, Cornelia; Mertens, Peter R; Hailfinger, Stephan; Dunn, Sandra E; Garbe, Claus; Schittek, Birgit
Molecular cancer research, 07/2018, Volume: 16, Issue: 7Journal Article
Cutaneous melanoma represents one of the most aggressive human tumor entities possessing a high tendency to metastasize. Cancer cells frequently exploit a highly conserved developmental program, the epithelial-to-mesenchymal transition (EMT), to gain migratory and invasive properties promoting their metastatic spread. Cytoplasmic localization of the oncogenic transcription and translation factor Y-box binding protein 1 (YB-1) is a powerful inducer of EMT in breast carcinoma cells. Interestingly, EMT-like processes have also been observed in cutaneous melanoma despite its neural crest origin. Here, increased expression of YB-1 negatively affects patient survival in malignant melanoma and promotes melanoma cell tumorigenicity both and Intriguingly, this effect seems to be mainly mediated by cytoplasmic YB-1 that does not exhibit phosphorylation at serine-102 (S102). Moreover, S102 unphosphorylated YB-1 enhances the migratory and invasive potential of human melanoma cells in two-dimensional (2D) and three-dimensional (3D) culture systems and facilitates acquisition of a mesenchymal-like invasive phenotype in the chick embryo model. Collectively, these data demonstrate that the cytoplasmic activity of YB-1 stimulates tumorigenicity and metastatic potential of melanoma cells by promoting EMT-like properties. This study reveals for the first time that YB-1 efficiently drives tumorigenicity and invasiveness of melanoma cells in its S102 unphosphorylated cytoplasmic state and that YB-1 expression represents a negative prognostic factor in primary melanoma patients. .
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