Microbial-host interactions specifically control the glycosylation pattern in intestinal mouse mucosa

Area of Science:

• Gastroenterology
• Microbiology
• Glycobiology

Background:

• Intestinal cell layer glycosylation is crucial for gut functions like transport, defense, and immunity.
• The gut microflora's role in modulating intestinal glycosylation has been hypothesized but lacked direct evidence.

Purpose of the Study:

• To establish a baseline of intestinal glycosylation in germ-free mice.
• To investigate the impact of gut microflora on intestinal cell glycoconjugate composition.

Main Methods:

• Histochemical analysis using a panel of ten lectins with defined glycan specificities.
• Comparison of glycosylation patterns between germ-free and conventional mice.
• Tissue sections from various cellular compartments of the small and large intestine were analyzed.

Main Results:

• Established a germ-free mice intestinal glycosylation baseline, showing proximodistal and cell lineage-specific glycan expression.
• Demonstrated that gut microflora quantitatively and qualitatively modulates intestinal glycosylation.
• Observed changes in cellular and subcellular distribution of glycans in conventional mice compared to germ-free.

Conclusions:

• Mice exhibit strict topological and cell lineage-specific regulation of glycosyltransferase expression.
• This study provides the first direct evidence in mice that gut microflora critically contributes to intestinal glycosylation.
• Gut microflora plays a significant role in shaping the glycosylation patterns of the intestinal cell layer.