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Activated zinc transporter ZIP7 as an indicator of anti-hormone resistance in breast cancer

Zilio, Silvia; Gee, Julia M W; Ellis, Ian O; Green, Andrew R; Finlay, Pauline; Gobbato, Anna; Taylor, Kathryn M

Authors

Silvia Zilio

Julia M W Gee

Andrew R Green

Pauline Finlay

Anna Gobbato

Kathryn M Taylor taylorkm@cardiff.ac.uk



Abstract

ZIP7, a member of the ZIP family of zinc importers, resides on the endoplasmic reticulum membrane and transports zinc from intracellular stores to the cytoplasm after activation by CK2 phosphorylation on two serine residues (S275 and S276). ZIP7 is known to be required for the growth of anti-hormone resistant breast cancer models, especially acquired tamoxifen-resistant cells developed from MCF-7. Using our new pS275S276ZIP7 antibody which only recognises activated ZIP7 (pZIP7), we have demonstrated that the hyperactivation of ZIP7 is prevalent in tamoxifen-resistant breast cancer cells. This evidence suggests that pZIP7 might have potential as a biomarker of acquired resistance to such anti-hormones in breast cancer, a current unmet clinical need. In this regard, we have also developed a new immunohistochemical assay for pZIP7 which allowed pZIP7 to be tested on a small clinical series of breast cancer tissues confirming its prevalence in such tumours and relationship to a variety of clinicopathological parameters and biomarkers previously associated with endocrine resistant phenotypes, notably increased activated MAPK signalling, expression of ErbB2, CD71 and the proto-oncogene c-Fos, as well as with increased tumour grade.

Journal Article Type Article
Publication Date Sep 4, 2019
Print ISSN 1756-5901
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Institution Citation Zilio, S., Gee, J. M. W., Ellis, I. O., Green, A. R., Finlay, P., Gobbato, A., & Taylor, K. M. (2019). Activated zinc transporter ZIP7 as an indicator of anti-hormone resistance in breast cancer. Metallomics, https://doi.org/10.1039/C9MT00136K
DOI https://doi.org/10.1039/C9MT00136K
Publisher URL https://pubs.rsc.org/en/content/articlelanding/2019/MT/C9MT00136K#!divAbstract