Estrogen receptor β regulates AKT activity through up-regulation of INPP4B and inhibits migration of prostate cancer cell line PC-3

Surendra Chaurasiya, Wanfu Wu, Anders M. Strom, Margaret Warner, Jan Ake Gustafsson

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Loss of the tumor suppressor, PTEN, is one of the most common findings in prostate cancer (PCa). This loss leads to overactive Akt signaling, which is correlated with increased metastasis and androgen independence. However, another tumor suppressor, inositolpolyphosphate 4-phosphatase type II (INPP4B), can partially compensate for the loss of PTEN. INPP4B is up-regulated by androgens, and this suggests that androgen-deprivation therapy (ADT) would lead to hyperactivity of AKT. However, in the present study, we found that in PCa, samples from men treated with ADT, ERβ, and INPP4B expression were maintained in some samples. To investigate the role of ERβ1 in regulation of INPPB, we engineered the highly metastatic PCa cell line, PC3, to express ERβ1. In these cells, INPP4B was induced by ERβ ligands, and this induction was accompanied by inhibition of Akt activity and reduction in cell migration. These findings reveal that, in the absence of androgens, ERβ1 induces INPP4B to dampen AKT signaling. Since the endogenous ERβ ligand, 3β- Adiol, is lost upon long-term ADT, to obtain the beneficial effects of ERβ1 on AKT signaling, an ERβ agonist should be added along with ADT.

Original languageEnglish (US)
Pages (from-to)26347-26355
Number of pages9
JournalProceedings of the National Academy of Sciences of the United States of America
Volume117
Issue number42
DOIs
StatePublished - Oct 20 2020

Keywords

  • Androgen deprivation therapy
  • Estrogen receptor
  • INPP4B
  • Prostate cancer

ASJC Scopus subject areas

  • General

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