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MicroRNA-422a functions as a tumor suppressor in non-small cell lung cancer through SULF2-mediated TGF-β/SMAD

Wei-Qiang Li1, Jian-Peng Zhang1, Yan-Yu Wang1

  • 1a Department of Thoracic Surgery , Beijing Luhe Hospital, Capital Medical University , Beijing , P. R. China.

Cell Cycle (Georgetown, Tex.)
|June 18, 2019
PubMed

Insights

MicroRNA-422a (miR-422a) inhibits non-small cell lung cancer (NSCLC) by downregulating sulfatase 2 (SULF2). This suppression blocks the TGF-β/SMAD pathway, reducing tumor growth and promoting apoptosis in NSCLC.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • MicroRNAs (miRNAs) regulate gene expression and are implicated in various cancers, including non-small cell lung cancer (NSCLC).
  • The specific role of miR-422a and its regulatory targets in NSCLC progression require further elucidation.

Purpose of the Study:

  • To investigate the role of miR-422a in NSCLC pathogenesis.
  • To identify sulfatase 2 (SULF2) as a direct target of miR-422a.
  • To elucidate the mechanism by which miR-422a influences NSCLC progression via the TGF-β/SMAD pathway.

Main Methods:

  • Expression analysis of miR-422a and SULF2 in NSCLC tissues and cells.
  • In vitro studies using miR-422a mimics/inhibitors and SULF2 siRNA.
  • Dual luciferase reporter gene assays to confirm direct targeting.
  • Assessment of epithelial-mesenchymal transition (EMT) and apoptosis-related genes.
  • In vivo tumorigenicity evaluation in xenograft mouse models.

Main Results:

  • miR-422a was significantly downregulated, while SULF2 was upregulated in NSCLC.
  • miR-422a directly targets and downregulates SULF2.
  • miR-422a/SULF2 axis suppressed NSCLC cell proliferation, migration, invasion, colony formation, and EMT.
  • miR-422a/SULF2 axis promoted apoptosis in NSCLC cells.
  • Silencing SULF2 or restoring miR-422a inhibited tumor growth, while TGF-β/SMAD pathway activation reversed these effects.

Conclusions:

  • miR-422a functions as a tumor suppressor in NSCLC by targeting SULF2.
  • The miR-422a/SULF2 interaction inhibits the TGF-β/SMAD pathway, thereby suppressing NSCLC progression.
  • Restoring miR-422a or inhibiting SULF2 represents a potential therapeutic strategy for NSCLC.
Keywords:
Sulfatase 2TGF-β/SMAD signaling pathwaycolony formationepithelial mesenchymal transitionmicroRNA-422anon-small cell lung cancer

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