Related Experiment Video

Updated: Sep 1, 2025

In Situ Detection of Ribonucleoprotein Complex Assembly in the C. elegans Germline using Proximity Ligation Assay
08:56

In Situ Detection of Ribonucleoprotein Complex Assembly in the C. elegans Germline using Proximity Ligation Assay

Published on: May 5, 2020

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Functional antagonism between CagA and DLC1 in gastric cancer

Isabel Hinsenkamp1, Jan P Köhler1, Christoph Flächsenhaar1,2

  • 1Department of Medicine II, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.

Cell Death Discovery
|August 13, 2022
PubMed

Insights

Helicobacter pylori infection reduces Deleted-in-liver-cancer-1 (DLC1) in the stomach, a key factor that normally prevents gastric cancer (GC) progression. Restoring DLC1 may offer a new strategy for preventing and treating GC.

Area of Science:

  • Gastroenterology
  • Oncology
  • Molecular Biology

Background:

  • Helicobacter pylori (H. pylori) gastritis is a significant risk factor for gastric cancer (GC).
  • Deleted-in-liver-cancer-1 (DLC1) is a tumor suppressor that inhibits RHOA signaling, implicated in diffuse GC.
  • DLC1's role in H. pylori-associated GC and its interaction with CagA are not fully understood.

Purpose of the Study:

  • To investigate the role of DLC1 in H. pylori-induced gastritis and gastric cancer.
  • To determine the mechanism by which H. pylori and its virulence factor CagA affect DLC1 expression and function.
  • To evaluate DLC1 as a potential biomarker or therapeutic target for GC.

Main Methods:

  • Immunohistochemistry to assess DLC1 expression in patient tissues and mouse models.
  • Western blotting and qPCR to analyze DLC1 protein and mRNA levels.
  • Luciferase reporter assays to measure promoter activity.
  • Cell migration assays and stress response analyses.

Main Results:

  • DLC1 expression was reduced in H. pylori-infected tissues and GC patients, inversely correlating with tumor progression.
  • H. pylori and CagA downregulated DLC1 promoter activity, leading to decreased DLC1 levels.
  • DLC1 inhibited cell migration and counteracted CagA-induced stress phenotypes.
  • DLC1 interacted with CagA, suggesting a protective mechanism.

Conclusions:

  • Loss of DLC1 is an early event in H. pylori-induced gastric carcinogenesis.
  • DLC1 acts as a suppressor of H. pylori-driven GC by neutralizing CagA.
  • DLC1 represents a potential therapeutic target for subtype-specific GC prevention and treatment.

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