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MiR-221 affects proliferation and apoptosis of gastric cancer cells through targeting SOCS3

Q-Y Zhou1, P-L Peng, Y-H Xu

  • 1Department of Pathology, The Central Hospital of Enshi Autonomous Prefecture, Enshi, China. biyaping351@126.com.

European Review for Medical and Pharmacological Sciences
|November 28, 2019
PubMed
Abstract

Insights

MicroRNA-221 (miR-221) promotes gastric cancer by inhibiting SOCS3, leading to increased cell proliferation and reduced apoptosis. Targeting miR-221 may offer a therapeutic strategy for gastric cancer treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • The JAK-STAT pathway is crucial in cellular signaling and is negatively regulated by suppressors of cytokine signaling 3 (SOCS3).
  • Bioinformatics analysis suggests a direct interaction between miR-221 and the 3'-untranslated region (3'-UTR) of SOCS3 mRNA.
  • Gastric cancer is a significant global health concern with complex regulatory mechanisms underlying its development.

Purpose of the Study:

  • To investigate the role of miR-221 in regulating the proliferation and apoptosis of gastric cancer cells.
  • To validate the direct targeting of SOCS3 mRNA by miR-221.
  • To explore the correlation between miR-221 expression, SOCS3 levels, and patient prognosis in gastric cancer.

Main Methods:

  • Dual-Luciferase reporter gene assay to confirm miR-221 and SOCS3 interaction.
  • Analysis of miR-221 and SOCS3 expression in gastric tumor tissues versus adjacent non-tumor tissues.
  • Kaplan-Meier survival analysis based on miR-221 expression levels.
  • In vitro experiments using SGC7901 gastric cancer cells with miR-221 inhibition to assess effects on SOCS3, JAK-STAT pathway components, apoptosis, and proliferation.

Main Results:

  • miR-221 expression was significantly upregulated in gastric tumor tissues compared to adjacent tissues, while SOCS3 expression was downregulated.
  • Higher miR-221 expression correlated with poorer patient prognosis.
  • A direct regulatory relationship between miR-221 and SOCS3 was confirmed.
  • Inhibition of miR-221 in SGC7901 cells led to increased SOCS3 expression, decreased phosphorylation of JAK2 and STAT3, enhanced cell apoptosis, and reduced cell proliferation.

Conclusions:

  • Elevated miR-221 and reduced SOCS3 expression are associated with gastric cancer progression.
  • MiR-221 promotes gastric cancer cell proliferation and inhibits apoptosis by targeting and downregulating SOCS3.
  • These findings highlight the miR-221/SOCS3 axis as a potential therapeutic target in gastric cancer.

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