Modulation of intestinal functions by food substances

Area of Science:

• Gastroenterology
• Nutritional Science
• Cell Biology

Background:

• The small intestinal epithelium is vital for nutrient absorption, digestion, and barrier function.
• Intestinal functions can be modulated by dietary components.
• Understanding these interactions is key to optimizing nutrient uptake and health.

Purpose of the Study:

• To investigate the effects of various food substances on intestinal epithelial functions, focusing on absorption.
• To identify specific food-derived compounds that modulate intestinal barrier integrity (tight junctions) and nutrient transporter activity.

Main Methods:

• Development and application of a novel human intestinal epithelial cell monolayer culture system.
• Assay to screen for food-derived substances that modulate tight junction (TJ) permeability.
• Screening for food substances affecting intestinal transporter functions, such as glucose transporters.

Main Results:

• Capsianoside, a diterpene glycoside from sweet pepper, was identified as a tight junction-modulating substance, potentially enhancing paracellular absorption.
• Polyphenolic compounds from plants, including green tea, were found to suppress intestinal glucose transporter activity.
• The study also explored the modulation of brush border enzymes by food substances.

Conclusions:

• Food substances can significantly influence intestinal absorption and barrier functions.
• Specific compounds like capsianoside and plant polyphenols offer potential for modulating nutrient absorption and blood glucose levels.
• The developed cell culture system provides a valuable tool for screening food-derived bioactives affecting intestinal functions.