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miRNA Expression Analyses in Prostate Cancer Clinical Tissues
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Increased nuclear factor I/B expression in prostate cancer correlates with AR expression.

Jagpreet S Nanda1,2, Wisam N Awadallah1,2, Sarah E Kohrt2,3

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Nuclear factor I/B (NFIB) expression increases in prostate cancer and interacts with the androgen receptor (AR). NFIB levels predict recurrence, especially in castration-resistant prostate cancer, highlighting its role in prostate cancer progression.

Keywords:
NFIBandrogen receptorprostate cancer

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Prostate cancer often expresses androgen receptor (AR), a key therapeutic target.
  • Nuclear factor I/B (NFIB) has been shown to regulate AR activity in prostate cancer cells.
  • The expression and role of NFIB in clinical prostate cancer samples were previously unknown.

Purpose of the Study:

  • To investigate the expression patterns of NFIB in various stages of prostate cancer.
  • To determine the correlation between NFIB expression, AR activity, and neuroendocrine prostate cancer (NEPCa) markers.
  • To elucidate the interaction between NFIB and AR in prostate cancer.

Main Methods:

  • Immunohistochemical staining of NFIB, AR, and synaptophysin on prostate cancer tissue microarrays.
  • Analysis of public datasets (cBioPortal) for NFIB, AR, and NEPCa activity scores.
  • Western blot analysis and subcellular fractionation of prostate cancer cell lines for NFIB expression and localization.
  • Co-immunoprecipitation assays to assess NFIB-AR interaction.

Main Results:

  • NFIB expression increased in prostate cancer tissues compared to normal controls, localized to both nucleus and cytoplasm.
  • Cytoplasmic AR and synaptophysin increased in primary prostate cancer; NFIB was highly expressed in small cell prostate cancer.
  • The ratio of cytoplasmic-to-nuclear NFIB predicted earlier biochemical recurrence, and cytoplasmic AR was an independent predictor.
  • NFIB expression correlated positively with AR activity and negatively with NEPCa score in castration-resistant prostate cancer.
  • NFIB and AR were found to interact via co-immunoprecipitation.

Conclusions:

  • NFIB is differentially expressed in prostate cancer, with altered localization in castration-resistant disease.
  • NFIB expression and localization are associated with AR activity and clinical outcomes, including recurrence.
  • A direct interaction between NFIB and AR was confirmed, suggesting a functional link in prostate cancer progression.