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miRNA Expression Analyses in Prostate Cancer Clinical Tissues
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Blood circulating exosomes carrying microRNA-423-5p regulates cell progression in prostate cancer via targeting FRMD3

Yongbao Wei1,2, Zhensheng Chen3, Ruochen Zhang1,2

  • 1Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China.

Journal of Cancer
|August 1, 2022
PubMed

Insights

Circulating exosomal microRNA-423-5p promotes prostate cancer (PCa) progression by down-regulating FRMD3. These findings highlight exosomal microRNA-423-5p as a potential oncogene and biomarker in PCa.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Prostate cancer (PCa) remains a significant health concern globally.
  • Understanding the molecular mechanisms driving PCa progression is crucial for developing effective therapies.
  • Circulating microRNAs (miRNAs) within exosomes are emerging as potential biomarkers and mediators of intercellular communication in cancer.

Purpose of the Study:

  • To investigate the role of exosomal microRNA-423-5p in prostate cancer (PCa) progression.
  • To elucidate the molecular mechanism by which microRNA-423-5p influences PCa.
  • To assess the potential of exosomal microRNA-423-5p as a diagnostic or prognostic marker for PCa.

Main Methods:

  • Microarray analysis to identify differentially expressed miRNAs in PCa samples.
  • Quantitative real-time PCR (qRT-PCR) to validate microRNA-423-5p expression in serum exosomes.
  • Luciferase gene reporter assays to confirm the target gene of microRNA-423-5p.
  • Cell function assays (proliferation, migration, invasion) and in vivo animal experiments.
  • Exosome labeling and tracing to study their internalization into PCa cells.

Main Results:

  • MicroRNA-423-5p was found to be highly expressed in PCa peripheral blood and serum exosomes compared to healthy controls.
  • Overexpression of microRNA-423-5p promoted PCa cell progression, including proliferation, migration, and invasion.
  • FRMD3 was identified as a direct target of microRNA-423-5p, with its expression being down-regulated by the miRNA.
  • Knockdown of FRMD3 reversed the effects of microRNA-423-5p silencing on PCa cell functions.
  • Exosomes carrying microRNA-423-5p were internalized into PCa cells and enhanced tumor growth in vivo.

Conclusions:

  • Circulating exosomal microRNA-423-5p acts as an oncogene in prostate cancer progression.
  • The molecular mechanism involves the down-regulation of FRMD3 by microRNA-423-5p.
  • Exosomal microRNA-423-5p represents a promising biomarker and therapeutic target for PCa.
Keywords:
FRMD3exosomemicroRNA-423-5pproliferationprostate cancer

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