Differential transcript and soluble factor patterns in macrophage/enterocyte-like monolayer co-cultures based on...

Area of Science:

• Gastroenterology
• Immunology
• Cell Biology

Background:

• Intestinal epithelial cells (IECs) maintain gut homeostasis and interact with the immune system through cytokine production.
• Understanding the cross-talk between enterocytes and immune cells is crucial for studying gastrointestinal inflammation.

Purpose of the Study:

• To investigate the interactions between Caco-2 intestinal epithelial cells and macrophages in a co-culture model.
• To mimic and analyze the communication between enterocytes and immune cells during gut inflammation.

Main Methods:

• Differentiated Caco-2 cell monolayers were stimulated with lipopolysaccharide (LPS) apically or basolaterally.
• Stimulated monolayers were co-cultured with THP-1 derived macrophages.
• Monolayer permeability, gene expression (mRNA), and secreted immune factors were analyzed.

Main Results:

• LPS exposure altered Caco-2 monolayer permeability and induced pro-inflammatory gene expression.
• Macrophage responses varied depending on the direction of LPS stimulation (apical vs. basolateral).
• Basolateral LPS triggered increased NF-kB1, IL-6, and IL-8 in macrophages, while apical LPS increased IL-1β.

Conclusions:

• IECs and macrophages exhibit distinct interaction patterns based on the location of inflammation.
• Polarized inflammatory dysregulation shapes specific immune gene network activation in the gut.