Hsa-miRNA-31 regulates epithelial cell barrier function by inhibiting TNFSF15 expression

Area of Science:

• Gastroenterology
• Molecular Biology
• Cell Biology

Background:

• Ulcerative colitis (UC) involves epithelial barrier disruption and immune dysregulation, with unknown causes.
• MicroRNA-31 is consistently altered in UC tissues, suggesting a potential role in the disease.

Purpose of the Study:

• To investigate the role of microRNA-31 in regulating intestinal epithelial barrier function.
• To elucidate the molecular mechanisms by which microRNA-31 impacts epithelial cells.

Main Methods:

• Utilized Caco2-BBE cell models to study microRNA-31 expression and function.
• Assessed trans-epithelial resistance (TER) and permeability to evaluate barrier function.
• Performed molecular analyses including 3-UTR binding assays and BrdU/TUNEL assays.

Main Results:

• MicroRNA-31 expression correlated positively with Caco2-BBE cell proliferation.
• Overexpression of microRNA-31 increased TER and decreased transepithelial permeability.
• MicroRNA-31 directly targets TNFSF15, inhibiting its expression.
• MicroRNA-31 promoted cell proliferation and apoptosis resistance.

Conclusions:

• MicroRNA-31 is a key regulator of intestinal epithelial barrier function.
• It enhances barrier integrity by promoting cell proliferation and apoptosis resistance.
• These findings reveal a novel mechanism involving microRNA-31 in epithelial homeostasis relevant to UC.