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MiR-182-5p Modulates Prostate Cancer Aggressive Phenotypes by Targeting EMT Associated Pathways.

Marilesia Ferreira Souza1,2, Ilce Mara Syllos Cólus1, Aline Simoneti Fonseca3

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Overexpressed miR-182-5p drives aggressive prostate cancer (PCa) phenotypes by impacting cell behavior and drug resistance. This microRNA targets epithelial-mesenchymal transition pathways in advanced PCa.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • Prostate cancer (PCa) is a heterogeneous disease influenced by epigenetic changes, including altered microRNA (miRNA) expression.
  • Overexpression of miR-182-5p is linked to PCa progression and reduced patient survival.

Purpose of the Study:

  • To investigate the regulatory role of miR-182-5p in aggressive phenotypes of androgen-refractory PCa cell lines.
  • To elucidate the mechanisms by which miR-182-5p influences tumor progression and response to therapy.

Main Methods:

  • Transient transfection of PC3 and DU-145 PCa cell lines with miR-182-5p inhibitors and mimics.
  • Assessment of cell proliferation, adhesion, migration, and viability against docetaxel and abiraterone.
  • Analysis of pAKT protein expression and epithelial-mesenchymal transition (EMT) markers.
  • Bioinformatic analysis including functional enrichment and miRNA/mRNA interaction.

Main Results:

  • miR-182-5p modulation significantly altered cell proliferation, adhesion, migration, and chemoresistance in PCa cell lines.
  • Changes in cell behavior were differentially observed between PC3 and DU-145 cell lines.
  • miR-182-5p was strongly implicated in the epithelial-mesenchymal transition (EMT) process, affecting EMT markers and tumor phenotypes.
  • Protein expression of pAKT, a tumor progression marker, was also affected.

Conclusions:

  • miR-182-5p acts as an oncomiR, differentially impacting tumorigenesis in androgen-refractory PCa cells.
  • The oncomiR activity is mediated through targeting of EMT-associated pathways.
  • Understanding miR-182-5p's role provides insights into PCa progression and potential therapeutic strategies.