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Mucin Agarose Gel Electrophoresis: Western Blotting for High-molecular-weight Glycoproteins
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Molecular Interactions between MUC1 Epithelial Mucin, β-Catenin, and CagA Proteins

Wei Guang1, William S Twaddell, Erik P Lillehoj

  • 1Department of Pediatrics, University of Maryland School of Medicine Baltimore, MD, USA.

Frontiers in Immunology
|May 9, 2012
PubMed

Insights

MUC1 over-expression inhibits Helicobacter pylori-induced IL-8 production and neutrophil infiltration by preventing beta-catenin nuclear translocation. This suggests MUC1 manipulation may be a therapeutic strategy for H. pylori infections.

Area of Science:

  • Gastroenterology
  • Immunology
  • Molecular Biology

Background:

  • Interleukin (IL)-8 drives neutrophil infiltration in H. pylori infections.
  • MUC1 expression influences IL-8 production in gastric epithelial cells.
  • Muc1 knockout mice show increased keratinocyte chemoattractant (KC), an IL-8 analog, during H. pylori infection.

Purpose of the Study:

  • To investigate if MUC1 associates with beta-catenin to inhibit H. pylori-induced beta-catenin nuclear translocation, thereby reducing IL-8 production.
  • To define the functional consequences of increased KC expression in Muc1-null animals.

Main Methods:

  • Protein co-immunoprecipitation (co-IP) studies were performed on AGS cells treated with or without H. pylori.
  • MUC1 expression levels were manipulated (over-expression vs. absence).
  • Nuclear localization of beta-catenin was assessed under different MUC1 expression conditions and H. pylori infection.

Main Results:

  • MUC1 formed a co-IP complex with beta-catenin and CagA.
  • MUC1 over-expression decreased CagA/beta-catenin co-IP.
  • H. pylori infection increased nuclear beta-catenin in the absence of MUC1 over-expression, but MUC1 over-expression reduced this effect.
  • Increased neutrophil infiltration was observed in H. pylori-infected Muc1(-/-) mice compared to wild type.

Conclusions:

  • MUC1 associates with beta-catenin and CagA, inhibiting H. pylori-induced beta-catenin nuclear translocation.
  • MUC1 over-expression reduces H. pylori-stimulated IL-8 production and neutrophil infiltration.
  • Targeting MUC1 expression presents a potential therapeutic strategy for managing H. pylori-associated stomach inflammation.
Keywords:
Helicobacter pylorigastricinfectionstomach

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