Snail promotes resistance to enzalutamide through regulation of androgen receptor activity in prostate cancer

Kathryn E. Ware, Jason A. Somarelli, Daneen Schaeffer, Jing Li, Tian Zhang, Sally Park, Steven R. Patierno, Jennifer Freedman, Wen Chi Foo, Mariano A. Garcia-Blanco, Andrew J. Armstrong

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Treatment with androgen-targeted therapies can induce upregulation of epithelial plasticity pathways. Epithelial plasticity is known to be important for metastatic dissemination and therapeutic resistance. The goal of this study is to elucidate the functional consequence of induced epithelial plasticity on AR regulation during disease progression to identify factors important for treatment-resistant and metastatic prostate cancer. We pinpoint the epithelial plasticity transcription factor, Snail, at the nexus of enzalutamide resistance and prostate cancer metastasis both in preclinical models of prostate cancer and in patients. In patients, Snail expression is associated with Gleason 9-10 high-risk disease and is strongly overexpressed in metastases as compared to localized prostate cancer. Snail expression is also elevated in enzalutamide-resistant prostate cancer cells compared to enzalutamidesensitive cells, and downregulation of Snail re-sensitizes enzalutamide-resistant cells to enzalutamide. While activation of Snail increases migration and invasion, it is also capable of promoting enzalutamide resistance in enzalutamide-sensitive cells. This Snail-mediated enzalutamide resistance is a consequence of increased full-length AR and AR-V7 expression and nuclear localization. Downregulation of either full-length AR or AR-V7 re-sensitizes cells to enzalutamide in the presence of Snail, thus connecting Snail-induced enzalutamide resistance directly to AR biology. Finally, we demonstrate that Snail is capable of mediating-resistance through AR even in the absence of AR-V7. These findings imply that increased Snail expression during progression to metastatic disease may prime cells for resistance to AR-targeted therapies by promoting AR activity in prostate cancer.

Original languageEnglish (US)
Pages (from-to)50525-50539
Number of pages15
JournalOncotarget
Volume7
Issue number31
DOIs
StatePublished - Jan 1 2016

Keywords

  • Androgen receptor
  • Castration resistance
  • Enzalutamide
  • Metastasis
  • Snail

ASJC Scopus subject areas

  • Oncology

Fingerprint Dive into the research topics of 'Snail promotes resistance to enzalutamide through regulation of androgen receptor activity in prostate cancer'. Together they form a unique fingerprint.

  • Cite this

    Ware, K. E., Somarelli, J. A., Schaeffer, D., Li, J., Zhang, T., Park, S., Patierno, S. R., Freedman, J., Foo, W. C., Garcia-Blanco, M. A., & Armstrong, A. J. (2016). Snail promotes resistance to enzalutamide through regulation of androgen receptor activity in prostate cancer. Oncotarget, 7(31), 50525-50539. https://doi.org/10.18632/oncotarget.10476