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miR-429 modulates the expression of c-myc in human gastric carcinoma cells

Tiewei Sun1, Chunmei Wang, Jun Xing

  • 1Department of General Surgery, Second Affiliated Hospital of Harbin Medical University, Hei LongJiang, Harbin, China.

European Journal of Cancer (Oxford, England : 1990)
|June 21, 2011
PubMed
Abstract

Insights

MicroRNA-429 (miR-429) is downregulated in gastric cancer, inhibiting cell viability and proliferation. It targets c-myc, suggesting miR-429 acts as a tumor suppressor in gastric carcinoma progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • MicroRNAs (miRNAs) are small non-coding RNAs regulating gene expression.
  • Dysregulation of miRNAs is implicated in various cancers, including gastric cancer.
  • Investigating specific miRNAs like miR-429 is crucial for understanding cancer pathogenesis.

Purpose of the Study:

  • To investigate the role and regulation of miR-429 in gastric cancer.
  • To explore the underlying mechanisms of miR-429's influence on gastric cancer development.
  • To identify downstream targets of miR-429 in gastric cancer cells.

Main Methods:

  • Real-time reverse transcriptase-polymerase chain reaction (RT-PCR) for miR-429 expression analysis in patient tissues and cell lines.
  • Bioinformatic analysis to predict potential downstream target genes of miR-429.
  • Luciferase reporter assays and Western blot analysis to validate miR-429 targets and their functional impact on gene expression (e.g., c-myc).

Main Results:

  • miR-429 expression was significantly downregulated in gastric cancer tissues and cells compared to normal tissues.
  • Transfection with miR-429 mimics reduced cell viability, proliferation, and attachment in gastric cancer cells.
  • miR-429 was confirmed to directly target the 3' untranslated region (3'UTR) of the c-myc gene, leading to decreased c-myc expression.
  • Lower miR-429 levels correlated with lymph node metastasis in gastric cancer patients.

Conclusions:

  • miR-429 functions as a tumor suppressor in gastric carcinoma, playing a role in its pathogenesis.
  • c-myc is identified as a key downstream target gene of miR-429 in gastric cancer.
  • The downregulation of miR-429 may contribute to gastric cancer progression and metastasis.

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