Cell-Matrix Interactions Contribute to Barrier Function in Human Colon Organoids.

Area of Science:

• Gastroenterology
• Cell Biology
• Biochemistry

Background:

• The role of cell-matrix adhesion in colon barrier integrity remains poorly understood.
• Investigating how extracellular matrix interactions influence colon permeability is essential for understanding gut health.

Purpose of the Study:

• To assess if disrupting colon epithelial cell-matrix interactions affects barrier permeability.
• To determine if enhancing cell-matrix adhesion complexes can counteract disruption effects.
• To evaluate the impact of Aquamin®, a multi-mineral product, on colon barrier function.

Main Methods:

• Human colon organoids were used to measure transepithelial electrical resistance (TEER).
• TEER was assessed under control conditions and with Aquamin® or a laminin-blocking antibody.
• Proteomic screening and Western blotting analyzed Aquamin®'s effect on cell-matrix adhesion proteins.

Main Results:

• Aquamin® significantly increased the expression of basement membrane, hemidesmosomal, and focal adhesion proteins.
• TEER values were elevated in organoids treated with Aquamin® compared to controls.
• A blocking antibody reduced TEER, with a more pronounced effect when cell-matrix adhesion proteins were less abundant.

Conclusions:

• Cell-matrix interactions play a significant role in maintaining colon barrier control.
• Aquamin® enhances colon barrier function by upregulating key cell-matrix adhesion proteins.
• Targeting cell-matrix adhesion pathways may offer therapeutic strategies for barrier dysfunction.