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Updated: Sep 3, 2026
The Citrobacter rodentium Mouse Model: Studying Pathogen and Host Contributions to Infectious Colitis
Published on: February 19, 2013
Escherichia coli adherence to the intestine of mice
Abstract:
Bacterial attachment to the intestine is the first step in the initiation of many intestinal infections. The effect of mucin and its major constituents on the adherence of a mannose-positive Escherichia coli strain to various intestinal segments of mouse intestine was examined. Removal of intestinal mucus led to increased adherence of E. coli to the ileal and colonic mucosal layers. Ileal mucin significantly decreased E. coli attachment to the ileum. Galactose and galactosamine were the major constituents of ileal mucin that reduced E. coli adherence to the ileum. We conclude that ileal mucin protects the epithelial cell from adherence by this mannose-positive E. coli strain. This protection is dependent on the presence of other sugar moieties that may be of importance in the adherence process.
Insights
Intestinal mucin, particularly from the ileum, prevents mannose-positive Escherichia coli (E. coli) from attaching to intestinal cells. Specific sugars like galactose and galactosamine in mucin are key to this protective effect against E. coli infections.
Area of Science:
- Microbiology
- Gastroenterology
- Immunology
Background:
- Bacterial attachment to the intestinal epithelium is a critical initial step in the pathogenesis of enteric infections.
- Understanding host-pathogen interactions at the mucosal surface is crucial for developing effective prevention and treatment strategies.
Purpose of the Study:
- To investigate the role of intestinal mucin and its components in modulating the adherence of a specific mannose-positive Escherichia coli strain to the mouse intestinal lining.
- To identify the specific constituents within ileal mucin responsible for reducing bacterial attachment.
Main Methods:
- The study examined the adherence of a mannose-positive E. coli strain to different segments of the mouse intestine.
- Intestinal mucus was removed to assess its impact on bacterial adherence.
- The effect of isolated ileal mucin and its major sugar constituents (galactose, galactosamine) on E. coli adherence was evaluated.
Main Results:
- Removal of intestinal mucus significantly increased E. coli adherence to the ileal and colonic mucosal surfaces.
- Ileal mucin demonstrated a significant inhibitory effect on E. coli attachment to the ileum.
- Galactose and galactosamine were identified as the primary components of ileal mucin responsible for reducing E. coli adherence.
Conclusions:
- Ileal mucin acts as a protective barrier, preventing the adherence of this mannose-positive E. coli strain to the intestinal epithelium.
- The protective capacity of ileal mucin against E. coli adherence is attributed to the presence of specific sugar moieties, highlighting their importance in host defense mechanisms.
