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Inhibition of miR-21 Regulates Mutant KRAS Effector Pathways and Intercepts Pancreatic Ductal Adenocarcinoma

Nina J Chu1, Robert A Anders1,2, Elana J Fertig1,3,4

  • 1Department of Oncology, Skip Viragh Center for Pancreas Cancer, Bloomberg Kimmel Institute for Cancer Immunotherapy, and the Sidney Kimmel Cancer Center at Johns Hopkins University School of Medicine, Baltimore, Maryland.

Cancer Prevention Research (Philadelphia, Pa.)
|May 16, 2020
PubMed

Insights

Early inhibition of miR-21 can prevent pancreatic intraepithelial neoplasia (PanIN) progression and improve survival in pancreatic ductal adenocarcinoma (PDA). miR-21 shows potential for early detection and interception of KRAS-driven premalignancies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Pancreatic ductal adenocarcinoma (PDA) arises from KRAS activation, involving complex transcriptional and epigenetic regulation.
  • Early premalignant lesions, pancreatic intraepithelial neoplasias (PanINs), precede PDA development.
  • MicroRNAs (miRNAs) are implicated as key regulators in tumorigenesis.

Purpose of the Study:

  • To identify and characterize cell-specific and compartment-specific miRNA regulators in early pancreatic tumorigenesis.
  • To investigate the therapeutic potential of targeting specific miRNAs in preclinical models of PDA.
  • To evaluate the clinical relevance of identified miRNAs in human PDA samples.

Main Methods:

  • Profiling of dysregulated miRNAs in genetically engineered mouse models (KPC mice) recapitulating human PDA.
  • Functional studies involving inhibition of miR-21 and overexpression of miR-224 in cellular and animal models.
  • In vivo studies assessing the impact of miR-21 inhibition on tumor progression and survival.
  • Analysis of miR-21 expression in human PDA patient cohorts (The Cancer Genome Atlas).

Main Results:

  • miR-21 was identified as overexpressed in tumor epithelial cells of premalignant PanINs and PDA.
  • miR-224 was found to be overexpressed in cancer-associated fibroblasts within the PDA stroma.
  • Inhibition of miR-21 reversed protumorigenic functions and improved survival in established PDA.
  • Early systemic miR-21 inhibition completely prevented premalignant progression in mice.
  • Human PDA data showed a correlation between tumor epithelial cell content and miR-21 expression.

Conclusions:

  • miR-21 acts as a critical cell-specific regulator in KRAS-driven pancreatic tumorigenesis.
  • Targeting miR-21 offers a promising strategy for early interception of premalignant pancreatic lesions.
  • miR-21 may serve as a biomarker for early PanIN detection and a therapeutic target for PDA.
  • These findings support further investigation of miR-21 in human clinical studies for PDA and other KRAS-driven premalignancies.

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