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Updated: Jun 29, 2025

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Ras-related Protein in Brain 4A (Rab4A) is Downregulated by miR-496 to inhibit the Progression of Gastric Cancer

Rui Su1, Meng Su2, Yan Lu3

  • 1Department of Gastrointestinal Surgery, Affiliated Hospital of Chengde Medical University, Chengde 067000, Hebei, China.

Combinatorial Chemistry & High Throughput Screening
|March 25, 2024
PubMed
Abstract

Insights

MicroRNA-496 (miR-496) inhibits Ras-related protein in brain 4A (Rab4A) expression. Silencing Rab4A suppresses gastric cancer cell growth and invasion by reducing epidermal growth factor receptor (EGFR) signaling.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • Ras-related protein in brain 4A (Rab4A) is a Rab family GTPase involved in intracellular trafficking.
  • Rab4A plays a regulatory role in the progression of various cancers.

Purpose of the Study:

  • To investigate the role of miR-496 in regulating Rab4A expression.
  • To determine the impact of Rab4A on gastric cancer cell behavior and signaling pathways.

Main Methods:

  • Gastric adenocarcinoma (AGS) cells were transfected with Rab4A-specific siRNA.
  • Luciferase reporter assays were performed to confirm the interaction between miR-496 and Rab4A.
  • Expression levels of Rab4A, epidermal growth factor receptor (EGFR), AKT, and β-catenin were analyzed.

Main Results:

  • Knockdown of Rab4A significantly inhibited proliferation, migration, and invasion of AGS cells.
  • Rab4A knockdown led to a marked decrease in surface EGFR expression and inhibited downstream AKT and β-catenin signaling.
  • miR-496 was found to down-regulate Rab4A expression in AGS cells, with direct binding to the Rab4A 3'UTR confirmed.

Conclusions:

  • miR-496 directly targets and inhibits Rab4A expression in gastric cancer cells.
  • Rab4A promotes gastric cancer progression by up-regulating surface EGFR expression and activating downstream pathways.
  • Rab4A represents a potential therapeutic target for gastric cancer treatment.
Keywords:
Epidermal growth factor receptorgastric cancerinvasion in AGS cells.miRNAras-related protein in brain 4A (Rab4A)surface expression

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