Opposing transcriptional programs of KLF5 and AR emerge during therapy for advanced prostate cancer

Nat Commun. 2021 Nov 4;12(1):6377. doi: 10.1038/s41467-021-26612-1.

Abstract

Endocrine therapies for prostate cancer inhibit the androgen receptor (AR) transcription factor. In most cases, AR activity resumes during therapy and drives progression to castration-resistant prostate cancer (CRPC). However, therapy can also promote lineage plasticity and select for AR-independent phenotypes that are uniformly lethal. Here, we demonstrate the stem cell transcription factor Krüppel-like factor 5 (KLF5) is low or absent in prostate cancers prior to endocrine therapy, but induced in a subset of CRPC, including CRPC displaying lineage plasticity. KLF5 and AR physically interact on chromatin and drive opposing transcriptional programs, with KLF5 promoting cellular migration, anchorage-independent growth, and basal epithelial cell phenotypes. We identify ERBB2 as a point of transcriptional convergence displaying activation by KLF5 and repression by AR. ERBB2 inhibitors preferentially block KLF5-driven oncogenic phenotypes. These findings implicate KLF5 as an oncogene that can be upregulated in CRPC to oppose AR activities and promote lineage plasticity.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Cell Line, Tumor
  • Humans
  • Kruppel-Like Transcription Factors / metabolism*
  • Male
  • Neoplasm Staging
  • Neuroendocrine Cells / metabolism*
  • Neuroendocrine Cells / pathology
  • Prostatic Neoplasms, Castration-Resistant / genetics
  • Prostatic Neoplasms, Castration-Resistant / metabolism*
  • Prostatic Neoplasms, Castration-Resistant / pathology
  • Receptor, ErbB-2 / metabolism*
  • Receptors, Androgen / metabolism*
  • Signal Transduction
  • Transcriptional Activation

Substances

  • AR protein, human
  • KLF5 protein, human
  • Kruppel-Like Transcription Factors
  • Receptors, Androgen
  • ERBB2 protein, human
  • Receptor, ErbB-2