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Mechanistic Insight into the Development of TNBS-Mediated Intestinal Fibrosis and Evaluating the Inhibitory Effects of Rapamycin
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MicroRNA-7/NF-κB signaling regulatory feedback circuit regulates gastric carcinogenesis

Xiao-Di Zhao1, Yuan-Yuan Lu1, Hao Guo1

  • 1State Key Laboratory of Cancer Biology, Xijing Hospital of Digestive Diseases, The Fourth Military Medical University, Xi'an, Shaanxi 710032, China.

The Journal of Cell Biology
|August 12, 2015
PubMed

Insights

MicroRNA-7 (miR-7) suppresses gastric cancer (GC) by targeting RELA and FOS. Aberrant NF-κB signaling, potentially from H. pylori, reduces miR-7, promoting GC progression.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • MicroRNAs are crucial regulators of gene expression in cancer.
  • Gastric cancer (GC) progression involves complex regulatory pathways.
  • Understanding dysregulated microRNAs in GC is vital for therapeutic strategies.

Purpose of the Study:

  • To investigate the role of miR-7 in gastric cancer (GC).
  • To elucidate the mechanism of miR-7 dysregulation in GC.
  • To identify novel targets and regulatory circuits involving miR-7.

Main Methods:

  • Genome-wide screening to identify miR-7 targets.
  • Cell proliferation and tumorigenesis assays upon miR-7 modulation.
  • Analysis of miR-7 expression correlation with patient survival.
  • Investigation of feedback loops involving miR-7, IKKε, RELA, and NF-κB signaling.
  • Assessment of Helicobacter pylori's role in miR-7 down-regulation.

Main Results:

  • RELA and FOS were identified as direct targets of miR-7.
  • miR-7 overexpression inhibited GC cell proliferation and tumorigenesis.
  • Low miR-7 expression correlated with high RELA/FOS and poor patient survival.
  • A feedback circuit between miR-7 and NF-κB signaling (via IKKε and RELA) was established.
  • Helicobacter pylori infection was linked to NF-κB activation and miR-7 down-regulation.

Conclusions:

  • miR-7 acts as a tumor suppressor in gastric cancer.
  • Dysregulation of the miR-7/RELA/FOS axis contributes to GC development.
  • The identified feedback loop and H. pylori link offer potential therapeutic targets.

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