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Novel Oncogenic Transcription Factor Cooperation in RB-Deficient Cancer

Amy C Mandigo1, Ayesha A Shafi1, Jennifer J McCann1

  • 1Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania.

Cancer Research
|October 9, 2021
PubMed

Insights

Retinoblastoma tumor suppressor (RB) loss in prostate cancer promotes tumor progression. RB loss drives cooperation between androgen receptor (AR) and E2F1 transcription factors, leading to advanced disease.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Retinoblastoma tumor suppressor (RB) protein regulates E2F-dependent transcription and cell-cycle control.
  • Loss of RB function is implicated in various cancers, including prostate cancer.
  • E2F transcription factors play a crucial role in cell proliferation and tumor development.

Purpose of the Study:

  • To investigate the genome-wide function of E2F1 following RB loss in prostate cancer models.
  • To identify novel transcriptional networks and cooperating factors involved in prostate cancer progression after RB loss.
  • To determine the clinical relevance of observed molecular mechanisms in human prostate cancer.

Main Methods:

  • Genome-wide assessment of E2F1 function in isogenic prostate cancer models.
  • Analysis of transcription factor cooperation, specifically between E2F1 and androgen receptor (AR).
  • Evaluation of identified transcriptional networks and their role in cancer phenotypes, including cell death evasion.
  • Correlation of findings with human prostate cancer patient data.

Main Results:

  • RB loss leads to repositioning and cooperation of E2F1 with oncogenic transcription factors, notably the androgen receptor (AR).
  • AR/E2F1 cooperation establishes novel transcriptional networks that promote cancer phenotypes, particularly evasion of cell death.
  • These molecular events are observed in human prostate cancer, highlighting clinical relevance.
  • The study identifies a critical AR/E2F1 cooperome linked to advanced prostate cancer progression.

Conclusions:

  • RB loss is a key driver of prostate cancer progression by enabling AR and E2F1 cooperation.
  • This cooperation creates new transcriptional programs that enhance cancer cell survival and promote advanced disease.
  • Understanding E2F1 targets and AR/E2F1 interactions is crucial for developing therapeutic strategies against advanced prostate cancer.

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