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RELA-induced MiR-21 Exerts Oncogenic Effects on PDAC via Targeting of ARHGAP24

Lanting Yu1,2, Jiawei Lu1,2, Haoran Xie1,2

  • 1Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China.

Journal of Cancer
|July 11, 2022
PubMed

Insights

RELA promotes pancreatic cancer by increasing miR-21, which drives tumor growth and inhibits apoptosis. This miR-21 targets ARHGAP24, a tumor suppressor, highlighting their potential as pancreatic ductal adenocarcinoma (PDAC) biomarkers.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • Inflammation is a known factor in pancreatic ductal adenocarcinoma (PDAC) development.
  • MicroRNAs (miRNAs) play a role in PDAC occurrence and progression.
  • The involvement of the inflammatory regulator RELA in miRNA-mediated PDAC regulation requires further investigation.

Purpose of the Study:

  • To investigate the role of miR-21 in pancreatic ductal adenocarcinoma (PDAC).
  • To elucidate the upstream regulatory mechanism of miR-21 involving RELA.
  • To determine the functional effects and target genes of miR-21 in PDAC.

Main Methods:

  • In situ hybridization to assess miR-21 expression in PDAC tissues.
  • Chromatin immunoprecipitation and dual-luciferase reporter assays to confirm RELA's regulation of miR-21.
  • In vitro assays (cell viability, EdU staining, flow cytometry) and in vivo xenograft assays to evaluate miR-21's functional effects.
  • Analysis of miR-21's direct target gene, ARHGAP24.

Main Results:

  • miR-21 expression is increased in PDAC tissues.
  • Transcription factor RELA directly modulates miR-21 transcription in PDAC cell lines.
  • miR-21 promotes cell proliferation and cell cycle progression while inhibiting apoptosis in vitro.
  • miR-21 accelerates tumor growth in vivo.
  • miR-21 directly targets and downregulates the tumor suppressor gene ARHGAP24.

Conclusions:

  • RELA-mediated upregulation of miR-21 contributes to PDAC progression.
  • miR-21 promotes PDAC by inhibiting apoptosis and enhancing proliferation.
  • ARHGAP24 is a tumor suppressor targeted by miR-21 in PDAC.
  • Both miR-21 and ARHGAP24 show strong associations with clinical features and may serve as valuable prognostic biomarkers for PDAC.
Keywords:
ARHGAP24Pancreatic ductal adenocarcinomaRELATranscription factormicroRNA

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