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MicroRNA-497-5p down-regulation increases PD-L1 expression in clear cell renal cell carcinoma

Fajun Qu1, Jianqing Ye1, Xiuwu Pan1

  • 1a Department of Urology , The Third Affiliated Hospital of Second Military Medical University , Shanghai , China.

Journal of Drug Targeting
|September 6, 2018
PubMed

Insights

This study reveals microRNA-497-5p down-regulation in clear cell renal cell carcinoma (ccRCC), leading to increased PD-L1 expression. This finding suggests miR-497-5p as a potential therapeutic target for ccRCC treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Immunotherapy

Background:

  • Clear cell renal cell carcinoma (ccRCC) treatment with PD-L1 inhibitors is limited by low PD-L1 positivity.
  • PD-L1 expression is heterogeneous and regulated by diverse mechanisms, including microRNAs.
  • Understanding microRNA regulation of PD-L1 is crucial for advancing ccRCC immunotherapy.

Purpose of the Study:

  • To investigate the role of microRNAs in regulating PD-L1 expression in ccRCC.
  • To identify specific microRNAs targeting PD-L1.
  • To evaluate the clinical significance and therapeutic potential of identified microRNAs in ccRCC.

Main Methods:

  • Bioinformatic prediction of microRNA targets for PD-L1 using miRDB and miRTarBase.
  • TaqMan assays to measure microRNA expression in ccRCC tissues.
  • TCGA-KIRC dataset analysis to correlate microRNA expression with PD-L1 levels and patient survival.
  • In vitro validation of PD-L1 as a direct target of microRNA-497-5p in RCC cell lines.
  • Functional assays to assess the impact of microRNA-497-5p on ccRCC cell behavior.

Main Results:

  • PD-L1 expression was significantly up-regulated in ccRCC compared to normal tissues.
  • MicroRNA-497-5p down-regulation was associated with PD-L1 up-regulation in ccRCC.
  • Down-regulation of microRNA-497-5p correlated with shorter survival in the TCGA-KIRC dataset.
  • MicroRNA-497-5p directly targets and inhibits PD-L1 expression.
  • MicroRNA-497-5p suppressed ccRCC cell proliferation, clone formation, and migration, while promoting apoptosis.

Conclusions:

  • MicroRNA-497-5p acts as a tumor suppressor in ccRCC by down-regulating PD-L1.
  • The identified regulatory axis of microRNA-497-5p and PD-L1 offers a novel therapeutic strategy for ccRCC.
  • MicroRNA-497-5p holds potential as a prognostic biomarker for ccRCC patients.
Keywords:
Clear cell renal cell carcinomaPD-L1immune checkpoint pathwayimmunotherapymicroRNA-497-5p

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