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NRIP/DCAF6 stabilizes the androgen receptor protein by displacing DDB2 from the CUL4A-DDB1 E3 ligase complex in

Hsin-Hsiung Chen1, Ping Fan1, Szu-Wei Chang1

  • 1Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei 100, Taiwan.

Oncotarget
|February 18, 2017
PubMed

Insights

Nuclear receptor interaction protein (NRIP) promotes prostate cancer by stabilizing androgen receptor (AR), while DNA damage binding protein 2 (DDB2) acts as a tumor suppressor. Their imbalance impacts AR homeostasis and aggressive cancer development.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • Nuclear receptor interaction protein (NRIP) and DNA damage binding protein 2 (DDB2) are part of the Cullin 4 (CUL4)-DDB1 binding protein family.
  • Both NRIP and DDB2 interact with the androgen receptor (AR), a key factor in prostate cancer.

Purpose of the Study:

  • To investigate the expression patterns of NRIP, DDB2, and AR in human prostate cancer tissues.
  • To elucidate the competitive binding dynamics between NRIP and DDB2 for AR.
  • To understand the role of NRIP and DDB2 in prostate cancer pathogenesis and AR protein stability.

Main Methods:

  • Analysis of NRIP, DDB2, and AR protein expression levels in prostate cancer versus non-neoplastic tissues.
  • Investigation of protein-protein interactions within the AR-DDB2-DDB1-CUL4A complex.
  • Correlation of protein expression patterns with specific prostate cancer histological subtypes (cribriform vs. non-cribriform).

Main Results:

  • NRIP and AR expression levels were elevated, while DDB2 levels were reduced in prostate cancer tissues compared to controls.
  • NRIP and DDB2 compete for the same binding domain on AR, with NRIP displacing DDB2.
  • High NRIP and AR, coupled with low DDB2, were more prevalent in aggressive cribriform prostate tumors.

Conclusions:

  • NRIP acts as a potential tumor promoter by stabilizing AR protein through DDB2 displacement.
  • DDB2 functions as a potential tumor suppressor in prostate cancer.
  • The disrupted balance between NRIP and DDB2 may contribute to the pathogenesis of aggressive prostate cancer by altering AR protein homeostasis.
Keywords:
ARCul4-DDB1DDB2NRIP/DCAF6cribriform prostate cancer

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