Loperamide increases mouse gut transit time in a dose-dependent manner with treatment duration-dependent effects on...

Area of Science:

• Microbiology
• Gastroenterology
• Pharmacology

Background:

• Intestinal transit time is recognized as a factor influencing gut microbiota composition.
• However, the causal relationship between transit time and gut microbial changes requires further investigation.

Purpose of the Study:

• To determine the effect of varying loperamide doses on mouse intestinal transit time.
• To investigate how increased intestinal transit time impacts the gut microbial community's composition and activity.

Main Methods:

• Mice were treated with different doses of loperamide to alter intestinal transit time.
• Gut microbial community composition was analyzed using 16S rRNA sequencing.
• Fecal fermentation assays were performed to assess microbial activity.

Main Results:

• Loperamide administration dose-dependently increased intestinal transit time.
• Significant alterations in the abundance of bacterial families (Bacteroidaceae, Erysipelotrichaceae, Porphyromonadaceae, Akkermansiaceae) were observed.
• Increased propionate levels were found in the cecum of mice treated with high-dose loperamide, indicating altered microbial fermentation.

Conclusions:

• The study establishes a causal link between altered intestinal transit time and changes in gut microbiome composition and activity.
• Loperamide-induced changes in gut microbiota are a consequence of modified transit time, not direct drug-microbe interactions.
• Findings highlight the importance of intestinal transit time as a modulator of the gut ecosystem.