Abstract
HER2/ErbB2 activation turns on transcriptional processes that induce local invasion and lead to systemic metastasis. The early transcriptional changes needed for ErbB2-induced invasion are poorly understood. Here, we link ErbB2 activation to invasion via ErbB2-induced, SUMO-directed phosphorylation of a single serine residue, S27, of the transcription factor myeloid zinc finger-1 (MZF1). Utilizing an antibody against MZF1-pS27, we show that the phosphorylation of S27 correlates significantly (p < 0.0001) with high-level expression of ErbB2 in primary invasive breast tumors. Phosphorylation of MZF1-S27 is an early response to ErbB2 activation and results in increased transcriptional activity of MZF1. It is needed for the ErbB2-induced expression of MZF1 target genes CTSB and PRKCA, and invasion of single-cells from ErbB2-expressing breast cancer spheroids. The phosphorylation of MZF1-S27 is preceded by poly-SUMOylation of K23, which can make S27 accessible to efficient phosphorylation by PAK4. Based on our results, we suggest for an activation mechanism where phosphorylation of MZF1-S27 triggers MZF1 dissociation from its transcriptional repressors such as the CCCTC-binding factor (CTCF). Our findings increase understanding of the regulation of invasive signaling in breast cancer by uncovering a detailed biological mechanism of how ErbB2 activation can rapidly lead to its invasion-promoting target gene expression and invasion.
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Data availability
The raw data from the mass spectrometry analysis and TMA staining are available upon request. The scripts and the files of the modeling and molecular dynamics simulation are available as a Github repository at https://github.com/ELELAB/MZF1_SUMO.
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Acknowledgements
We acknowledge the excellent technical assistance of Anni Hadesten and Louise Vandervox and give special thanks to Professor Audrey Minden for PAK4, Professor Marin Barisic for the ΔT-3xHA-DEST CW plasmids, and Dr. Vincent Collins for help with the language editing.
Funding
Funding was provided by the Novo Nordisk Foundation (NNF15OC0017324) (TK), the Danish Medical Research Council (0602-02386B) (TK), the Danish Cancer Society Scientific Committee (KBVU) (R124-A7854-15-S2 and R56-A3108-12-S2) (TK), the Danish National Research Foundation (DNRF125) (MJ), the European Research Council (AdG 340751) (MJ), EU-PRACE DECI13th grant for computational resources (EP), and the DeiC Pilot Grant 2015-2016 for the Danish Supercomputing Center Computerome (EP).
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DMB, SAT, MBH, KBC, TO, VS, ML, PP, EP, and JM performed the experiments. KH, IG, PJ, and MV provided materials and/or facilities, TK planned the project, and wrote the manuscript, and TK, DMB, and MJ edited it.
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Brix, D.M., Tvingsholm, S.A., Hansen, M.B. et al. Release of transcriptional repression via ErbB2-induced, SUMO-directed phosphorylation of myeloid zinc finger-1 serine 27 activates lysosome redistribution and invasion. Oncogene 38, 3170–3184 (2019). https://doi.org/10.1038/s41388-018-0653-x
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DOI: https://doi.org/10.1038/s41388-018-0653-x
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