Fibroblast growth factor signalling induces loss of progesterone receptor in breast cancer cells
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Dominika Piasecka1,4, Kamila Kitowska1, Dominika Czaplinska2, Kamil Mieczkowski1, Magdalena Mieszkowska1, Lukasz Turczyk1, Andrzej C. Skladanowski1, Anna J. Zaczek2, Wojciech Biernat3, Radzislaw Kordek4, Hanna M. Romanska4, Rafal Sadej1
1Department of Molecular Enzymology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Poland
2Department of Cell Biology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Poland
3Department of Pathomorphology, Medical University of Gdansk, Poland
4Department of Pathology, Medical University of Lodz, Poland
Rafal Sadej, email: [email protected]
Hanna M. Romanska, email: [email protected]
Keywords: progesterone receptor, FGFR2, breast cancer
Received: April 12, 2016 Accepted: November 07, 2016 Published: November 12, 2016
We have recently demonstrated that, fibroblast growth factor 2 (FGFR2), signalling via ribosomal S6 kinase 2 (RSK2), promotes progression of breast cancer (BCa). Loss of progesterone receptor (PR), whose activity in BCa cells can be stimulated by growth factor receptors (GFRs), is associated with poor patient outcome. Here we showed that FGF7/FGFR2 triggered phosphorylation of PR at Ser294, PR ubiquitination and subsequent receptor`s degradation via the 26S proteasome pathway in BCa cells. We further demonstrated that RSK2 mediated FGF7/FGFR2-induced PR downregulation. In addition, a strong synergistic effect of FGF7 and progesterone (Pg), reflected in the enhanced anchorage-independent growth and cell migration, was observed. Analysis of clinical material demonstrated that expression of PR inversely correlated with activated RSK (RSK-P) (p = 0.016). Patients with RSK-P(+)/PR(–) tumours had 3.629-fold higher risk of recurrence (p = 0.002), when compared with the rest of the cohort. Moreover, RSK-P(+)/PR(–) phenotype was shown as an independent prognostic factor (p = 0.006). These results indicate that the FGF7/FGFR2-RSK2 axis promotes PR turnover and activity, which may sensitize BCa cells to stromal stimuli and contribute to the progression toward steroid hormone negative BCa.
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