Site-Specific Gut Microbiome Changes After Roux-en-Y Gastric Bypass in Rats: Effects of a Multicomponent Bovine...

Area of Science:

• Gastroenterology
• Microbiome Research
• Metabolic Surgery

Background:

• Roux-en-Y gastric bypass (RYGB) surgery significantly alters the gut microbiome, potentially affecting metabolic health.
• Understanding the site-specific microbial changes post-RYGB is crucial for developing targeted interventions.

Purpose of the Study:

• To investigate the site-specific effects of a bovine colostrum-honey-serviceberry (CHJ) complex on the gut microbiome after RYGB in obese rats.
• To analyze the impact of CHJ supplementation on mucosal-associated microbiota and serum metabolites in different gastrointestinal segments.

Main Methods:

• Wistar rats underwent RYGB surgery with or without CHJ supplementation.
• Mucosal-associated microbiota was analyzed using 16S rRNA sequencing across five gastrointestinal segments.
• Serum metabolite profiling was performed to assess metabolic changes.

Main Results:

• RYGB induced regional dysbiosis, characterized by decreased alpha diversity, increased Proteobacteria in the duodenum, and reduced SCFA-producing bacteria.
• CHJ supplementation had dual effects: restoring beneficial bacteria (Lactobacillus, Bifidobacterium) distally while increasing Enterobacteriaceae proximally.
• Significant serum vitamin B1 reduction was observed despite predicted thiamine pathway activation, indicating absorption deficits.

Conclusions:

• Post-RYGB gut dysbiosis exhibits significant regional heterogeneity, necessitating segment-specific interventions.
• Nutritional supplementation like CHJ can modulate the gut microbiome post-RYGB, but with complex, site-specific outcomes.
• The study highlights intricate interactions between surgical alterations, gut ecology, and nutritional support in determining metabolic health.