Fibroblasts modulate epithelial cell behavior within the proliferative niche and differentiated cell zone within a...

Area of Science:

• Gastroenterology
• Cell Biology
• Tissue Engineering

Background:

• Colonic epithelial cells interact with underlying fibroblasts.
• Fibroblasts support stem cells and regulate epithelial differentiation.
• Understanding these interactions is crucial for gut homeostasis.

Purpose of the Study:

• To develop an in vitro model of colonic crypts to study fibroblast-epithelial cell interactions.
• To investigate the role of fibroblasts in colonic epithelial cell differentiation and proliferation.
• To identify molecular changes in epithelium co-cultured with fibroblasts.

Main Methods:

• Formation of an in vitro colonic crypt model using primary epithelial and fibroblast cells on a collagen scaffold.
• Culturing epithelial cells with and without fibroblasts.
• Analysis of crypt structure, cell proliferation, barrier function, and gene expression via bulk-RNA sequencing.

Main Results:

• The co-culture model recapitulated crypt structure with stem cell niches and differentiated zones.
• Fibroblasts enhanced epithelial cell differentiation and accelerated the formation of a high-resistance epithelial barrier.
• Fibroblasts modulated cell proliferation, increasing crypt numbers but decreasing cells per crypt.
• Bulk-RNA sequencing identified significant gene expression changes in co-cultured epithelium.

Conclusions:

• The developed in vitro crypt model effectively simulates fibroblast-epithelial cell interactions.
• Bidirectional communication between colonic fibroblasts and epithelial cells influences differentiation and barrier function.
• This model provides a platform for investigating gut health and disease mechanisms involving these cell types.