Modeling intestinal epithelial function and polarity using human iPSCs under Air-Liquid interface culture

Area of Science:

• Stem cell biology
• Gastroenterology
• Tissue engineering

Background:

• Human intestinal epithelium is vital for nutrient absorption, barrier function, and immune regulation.
• Current organoid models have limitations in apical access, hindering drug delivery and secretion studies.
• A new air-liquid interface (ALI) culture system using human induced pluripotent stem cells (iPSCs) was developed to overcome these limitations.

Purpose of the Study:

• To develop and validate a human iPSC-derived ALI culture system for intestinal epithelium.
• To evaluate epithelial polarity and function in response to stimuli.
• To analyze polarized extracellular vesicle (EV) secretion profiles.

Main Methods:

• Human iPSCs were differentiated into intestinal stem cells and cultured under ALI conditions.
• Epithelial tissues were characterized via immunohistochemistry, gene expression, and transepithelial electrical resistance (TEER).
• Responses to indomethacin and EV miRNA profiles from apical/basal compartments were analyzed.

Main Results:

• The ALI system generated a polarized intestinal epithelial monolayer with absorptive and secretory cells.
• Basal indomethacin exposure caused significant mucosal injury and inflammation compared to apical exposure.
• Apical and basal EV secretions showed distinct miRNA profiles, indicating polarized secretion.

Conclusions:

• The iPSC-derived ALI culture system offers a physiologically polarized model for intestinal research.
• This model is suitable for studying drug responses and polarized EV secretion.
• Potential applications include personalized medicine and advanced drug development.