MiR-185 attenuates androgen receptor function in prostate cancer indirectly by targeting bromodomain containing 8...

Area of Science:

• Molecular Biology
• Cancer Research
• Genetics

Background:

• Aberrant androgen receptor (AR) signaling is crucial in prostate cancer (PCa) development.
• MicroRNAs (miRNAs) play significant roles in cancer pathogenesis.
• Understanding miRNA-mediated regulation of AR signaling is vital for PCa treatment.

Purpose of the Study:

• To investigate the interaction between miR-185 and bromodomain containing 8 isoform 2 (BRD8 ISO2).
• To elucidate the indirect mechanisms by which miR-185 affects AR function through BRD8 ISO2 in PCa.
• To explore the potential of miR-185 and BRD8 ISO2 as therapeutic targets in PCa.

Main Methods:

• Bioinformatics prediction of miRNA response element (MRE) for miR-185 in BRD8 ISO2 3'-UTR.
• Dual-luciferase assays and Ago2 immunoprecipitation to confirm miR-185 binding to BRD8 ISO2 mRNA.
• Quantitative real-time PCR (qRT-PCR) and Western blot to assess gene and protein expression.
• Reporter assays to evaluate AR activity.
• Correlation analysis in clinical PCa specimens.

Main Results:

• miR-185 directly binds to the 3'-UTR of BRD8 ISO2 mRNA.
• miR-185 mimic transfection decreased BRD8 ISO2 expression, while miR-185 inhibitor increased it.
• miR-185 attenuates AR function by suppressing BRD8 ISO2.
• BRD8 ISO2 mRNA expression is inversely correlated with miR-185 expression in PCa tissues.

Conclusions:

• miR-185 indirectly attenuates AR function by suppressing BRD8 ISO2 in PCa.
• This interaction provides a novel mechanism for AR regulation in prostate cancer.
• miR-185 and BRD8 ISO2 represent potential therapeutic targets for PCa treatment.