High Red Meat Intake Exacerbates Dextran Sulfate-Induced Colitis by Altering Gut Microbiota in Mice.

Area of Science:

• Gastroenterology
• Microbiology
• Immunology

Background:

• Inflammatory bowel disease (IBD) poses a significant public health risk, with its exact cause remaining unknown.
• A diet high in red meat consumption is strongly associated with IBD development.

Purpose of the Study:

• To investigate if high red meat intake exacerbates colitis and to elucidate the underlying mechanisms.
• To assess the impact of red meat on intestinal microbiota composition and gut barrier function.

Main Methods:

• Mice were fed varying levels of red meat for 8 weeks, followed by 16S rRNA sequencing of colonic contents.
• Colitis was induced using 3% dextran sulfate sodium (DSS) in mice.
• The study evaluated colitis severity, inflammatory cytokine levels, and colon barrier integrity markers (ZO-1, claudin, occludin).

Main Results:

• High red meat intake led to gut microbiota dysbiosis, decreasing beneficial bacteria (e.g., Lachnospiraceae_NK4A136_group, Faecalibaculum, Blautia, Dubosiella) and increasing harmful bacteria (e.g., Bacteroides, Alistipes).
• This dysbiosis correlated with increased colitis severity, impaired colon barrier integrity, and elevated expression of inflammatory cytokines (IL-1β, TNF-α, IL-17, IL-6) and enzymes (COX-2, iNOS).

Conclusions:

• High red meat consumption can increase susceptibility to colitis by altering the gut microbiota and compromising the intestinal barrier.
• Dietary modification, specifically reducing red meat intake, is recommended for the prevention of IBD.