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  • Original Article
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Decreased LRIG1 in fulvestrant-treated luminal breast cancer cells permits ErbB3 upregulation and increased growth

A Corrigendum to this article was published on 03 March 2016

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Abstract

ErbB3, a member of the ErbB family of receptor tyrosine kinases, is a potent activator of phosphatidyl inositol-3 kinase (PI3K) and mammalian target of rapamycin (mTOR) signaling, driving tumor cell survival and therapeutic resistance in breast cancers. In luminal breast cancers, ErbB3 upregulation following treatment with the antiestrogen fulvestrant enhances PI3K/mTOR-mediated cell survival. However, the mechanism by which ErbB3 is upregulated in fulvestrant-treated cells is unknown. We found that ErbB3 protein levels and cell surface presentation were increased following fulvestrant treatment, focusing our attention on proteins that regulate ErbB3 at the cell surface, including Nrdp1, NEDD4 and LRIG1. Among these, only LRIG1 correlated positively with ERα, but inversely with ErbB3 in clinical breast cancer data sets. LRIG1, an estrogen-inducible ErbB downregulator, was decreased in a panel of fulvestrant-treated luminal breast cancer cells. Ectopic LRIG1 expression from an estrogen-independent promoter uncoupled LRIG1 from estrogen regulation, thus sustaining LRIG1 and maintaining low ErbB3 levels in fulvestrant-treated cells. An LRIG1 mutant lacking the ErbB3 interaction motif was insufficient to downregulate ErbB3. Importantly, LRIG1 overexpression improved fulvestrant-mediated growth inhibition, whereas cells expressing the LRIG1 mutant were poorly sensitive to fulvestrant, despite effective ERα downregulation. Consistent with these results, LRIG1 expression correlated positively with increased disease-free survival in antiestrogen-treated breast cancer patients. These data suggest that ERα-dependent expression of LRIG1 dampens ErbB3 signaling in luminal breast cancer cells, and by blocking ERα activity with fulvestrant, LRIG1 is decreased thus permitting ErbB3 accumulation, enhanced ErbB3 signaling to cell survival pathways and blunting therapeutic response to fulvestrant.

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  • 03 March 2016

    This article has been corrected since Advance Online Publication and a corrigendum is also printed in this issue.

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Acknowledgements

This work was supported by the National Institutes of Health R01CA143126 (RSC) and Susan G. Komen for the Cure grant KG100677 (RSC).

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Correspondence to R S Cook.

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Morrison, M., Williams, M., Vaught, D. et al. Decreased LRIG1 in fulvestrant-treated luminal breast cancer cells permits ErbB3 upregulation and increased growth. Oncogene 35, 1143–1152 (2016). https://doi.org/10.1038/onc.2015.169

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