MicroRNA-194 Promotes Prostate Cancer Metastasis by Inhibiting SOCS2 Academic Article uri icon

abstract

  • Serum levels of miR-194 have been reported to predict prostate cancer recurrence after surgery, but its functional contributions to this disease have not been studied. Herein, it is demonstrated that miR-194 is a driver of prostate cancer metastasis. Prostate tissue levels of miR-194 were associated with disease aggressiveness and poor outcome. Ectopic delivery of miR-194 stimulated migration, invasion, and epithelial-mesenchymal transition in human prostate cancer cell lines, and stable overexpression of miR-194 enhanced metastasis of intravenous and intraprostatic tumor xenografts. Conversely, inhibition of miR-194 activity suppressed the invasive capacity of prostate cancer cell lines in vitro and in vivo Mechanistic investigations identified the ubiquitin ligase suppressor of cytokine signaling 2 (SOCS2) as a direct, biologically relevant target of miR-194 in prostate cancer. Low levels of SOCS2 correlated strongly with disease recurrence and metastasis in clinical specimens. SOCS2 downregulation recapitulated miR-194-driven metastatic phenotypes, whereas overexpression of a nontargetable SOCS2 reduced miR-194-stimulated invasion. Targeting of SOCS2 by miR-194 resulted in derepression of the oncogenic kinases FLT3 and JAK2, leading to enhanced ERK and STAT3 signaling. Pharmacologic inhibition of ERK and JAK/STAT pathways reversed miR-194-driven phenotypes. The GATA2 transcription factor was identified as an upstream regulator of miR-194, consistent with a strong concordance between GATA2 and miR-194 levels in clinical specimens. Overall, these results offer new insights into the molecular mechanisms of metastatic progression in prostate cancer. Cancer Res; 77(4); 1021-34. ©2016 AACR.

authors

  • Das, Rajdeep
  • Gregory, Philip A
  • Fernandes, Rayzel C
  • Denis, Iza
  • Wang, Qingqing
  • Townley, Scott L
  • Zhao, Shuang G
  • Hanson, Adrienne R
  • Pickering, Marie A
  • Armstrong, Heather K
  • Lokman, Noor A
  • Ebrahimie, Esmaeil
  • Davicioni, Elai
  • Jenkins, Robert B
  • Karnes, R Jeffrey
  • Ross, Ashley E
  • Den, Robert B
  • Klein, Eric A
  • Chi, Kim N
  • Ramshaw, Hayley S
  • Williams, Elizabeth D
  • Zoubeidi, Amina
  • Goodall, Gregory J
  • Feng, Felix Y
  • Butler, Lisa M
  • Tilley, Wayne D
  • Selth, Luke A

publication date

  • 2017