Bioengineering Novel in vitro Co-culture Models That Represent the Human Intestinal Mucosa With Improved Caco-2...

Area of Science:

• Cell Biology
• Tissue Engineering
• Gastroenterology

Background:

• The Caco-2 cell monolayer is a standard in vitro model for human intestinal mucosa.
• Existing models lack crucial intercellular communication, particularly signals from lamina propria fibroblasts.
• This limits the physiological relevance of current in vitro intestinal models.

Purpose of the Study:

• To investigate the impact of fibroblasts on Caco-2 epithelial cell morphology and function.
• To develop and validate novel 3D co-culture models for studying epithelial-fibroblast interactions.
• To assess the potential of these models for improved drug permeability studies.

Main Methods:

• Caco-2 cells were cultured with fibroblast-conditioned media to assess indirect signaling.
• Novel humanized 3D co-culture models were developed using Caco-2 cells on fibroblast-populated subepithelial constructs.
• Morphological and functional assessments, including TEER measurements, were performed on the co-cultured cells.

Main Results:

• Indirect signaling via conditioned media did not significantly alter Caco-2 cell characteristics.
• Direct contact in 3D co-cultures induced enhanced epithelial cell polarization and basement membrane formation.
• Fibroblast contact led to a straightened lateral membrane and increased paracellular permeability, mimicking in vivo conditions.

Conclusions:

• Direct epithelial-mesenchymal cell contact significantly enhances the epithelial barrier function in vitro.
• The developed 3D co-culture models provide a more physiologically relevant platform for intestinal research.
• These advanced models hold promise for more accurate drug permeability assessments and studying gut mucosal interactions.