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Updated: Oct 25, 2025
The Citrobacter rodentium Mouse Model: Studying Pathogen and Host Contributions to Infectious Colitis
Published on: February 19, 2013
Pectins that Structurally Differ in the Distribution of Methyl-Esters Attenuate Citrobacter rodentium-Induced Colitis
Martin Beukema1, Renate Akkerman1, Éva Jermendi2
1Immunoendocrinology, Division of Medical Biology, Department of Pathology and Medical Biology, University Medical Center Groningen, Groningen, The Netherlands.
Introduction:
Pectins have anti-inflammatory properties on intestinal immunity through direct interactions on Toll-like receptors (TLRs) in the small intestine or via stimulating microbiota-dependent effects in the large intestine. Both the degree of methyl-esterification (DM) and the distribution of methyl-esters (degree of blockiness; DB) of pectins contribute to this influence on immunity, but whether and how the DB impacts immunity through microbiota-dependent effects in the large intestine is unknown. Therefore, this study tests pectins that structurally differ in DB in a mouse model with Citrobacter rodentium induced colitis and studies the impact on the intestinal microbiota composition and associated attenuation of inflammation.
Methods And Results:
Both low and high DB pectins induce a more rich and diverse microbiota composition. These pectins also lower the bacterial load of C. rodentium in cecal digesta. Through these effects, both low and high DB pectins attenuate C. rodentium induced colitis resulting in reduced intestinal damage, reduced numbers of Th1-cells, which are increased in case of C. rodentium induced colitis, and reduced levels of GATA3+ Tregs, which are related to tissue inflammation.
Conclusion:
Pectins prevent C. rodentium induced colonic inflammation by lowering the C. rodentium load in the caecum independently of the DB.
Insights
Pectins with varying methyl-ester distribution reduce gut inflammation by altering the gut microbiota and lowering bacterial load. This study shows pectins effectively combat Citrobacter rodentium induced colitis, regardless of pectin structure.
Area of Science:
- Immunology
- Microbiology
- Gastroenterology
Background:
- Pectins modulate intestinal immunity via Toll-like receptors (TLRs) or microbiota-dependent effects.
- Both methyl-esterification degree (DM) and blockiness (DB) influence pectin's immunomodulatory effects.
- The impact of pectin's DB on microbiota-dependent immunity in the colon remains unclear.
Purpose of the Study:
- To investigate how pectins with different degrees of blockiness (DB) affect intestinal microbiota composition.
- To determine the impact of pectin DB on microbiota-dependent attenuation of inflammation in a mouse model of Citrobacter rodentium induced colitis.
Main Methods:
- Mice were induced with Citrobacter rodentium colitis.
- Pectins differing in degree of blockiness (DB) were administered.
- Intestinal microbiota composition and inflammatory markers were analyzed.
Main Results:
- Both low and high DB pectins promoted a richer, more diverse gut microbiota.
- Pectins reduced Citrobacter rodentium bacterial load in cecal digesta.
- Pectins attenuated colitis, decreasing intestinal damage, Th1 cells, and GATA3+ Tregs.
Conclusions:
- Pectins prevent Citrobacter rodentium induced colitis by reducing bacterial load in the cecum.
- This anti-inflammatory effect is independent of the pectin's degree of blockiness (DB).
