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Upregulation of miR-130b Contributes to Risk of Poor Prognosis and Racial Disparity in African-American Prostate

Yutaka Hashimoto1,2, Marisa Shiina1,2, Pritha Dasgupta1,2

  • 1Department of Urology, San Francisco VA Medical Center, San Francisco, California.

Cancer Prevention Research (Philadelphia, Pa.)
|July 4, 2019
PubMed

Insights

MicroRNA-130b (miR-130b) overexpression contributes to prostate cancer health disparities in African-American men, acting as a prognostic biomarker and potential therapeutic target. Inhibiting miR-130b shows tumor suppressor effects, offering a new treatment strategy.

Area of Science:

  • Oncology
  • Genetics
  • Health Disparities

Background:

  • Prostate cancer exhibits higher incidence and mortality rates in African-American (AA) men compared to European-American (EA) men, indicating significant health disparities.
  • The specific molecular mechanisms driving these race-based differences in prostate cancer remain incompletely understood.

Purpose of the Study:

  • To investigate the role of microRNA-130b (miR-130b) in contributing to prostate cancer health disparities observed in AA patients.
  • To evaluate miR-130b as a potential prognostic biomarker and therapeutic target for AA prostate cancer.

Main Methods:

  • Utilized a multi-pronged approach including cell lines, patient tissue samples, and The Cancer Genome Atlas (TCGA) database.
  • Performed functional assays (proliferation, migration, invasion, cell cycle), molecular analyses (RT2-PCR array, qRT-PCR, immunoblot, IHC), and statistical methods (Kaplan-Meier, survival analyses).

Main Results:

  • Elevated miR-130b levels correlated with race disparity, prostate-specific antigen (PSA) levels, and treatment failure in AA patients.
  • miR-130b was identified as an independent prognostic biomarker for AA patients, directly targeting tumor suppressor genes CDKN1B and FHIT.
  • Inhibition of miR-130b demonstrated tumor suppressor effects, reducing cancer cell proliferation, invasion, and inducing cell-cycle arrest, with race-specific pathway modulation observed.

Conclusions:

  • miR-130b overexpression is a significant factor in prostate cancer racial disparity and a risk factor for poor prognosis in AA men.
  • Attenuation of miR-130b exhibits tumor suppressor activity, suggesting its potential as a novel therapeutic target for managing prostate cancer in AA patients.

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