Matrix Stiffness Affects Glycocalyx Expression in Cultured Endothelial Cells.

Area of Science:

• Biomedical Engineering
• Cell Biology
• Vascular Biology

Background:

• The endothelial cell glycocalyx (GCX) is crucial for vascular health and acts as a mechanosensor.
• Previous research linked matrix stiffness to reduced GCX components (heparan sulfate, Glypican 1) and endothelial dysfunction.

Purpose of the Study:

• To investigate if stiff matrices inhibit GCX expression and endothelial function in additional cell types.
• To determine the generalizability of matrix stiffness effects on GCX in various endothelial cells.

Main Methods:

• Cultured bovine aortic, mouse aortic, and mouse brain endothelial cells on glass, soft (2.5 kPa), and stiff (10 kPa) polyacrylamide gels.
• Assessed expression of GCX components, including heparan sulfate, Glypican 1, and hyaluronic acid.

Main Results:

• Glass substrates significantly reduced GCX heparan sulfate expression across all tested cell types compared to soft gels.
• Stiff matrices also decreased Glypican 1 (4/5 cell types) and hyaluronic acid (2/5 cell types) expression.
• Reduced GCX expression correlated with impaired endothelial cell function.

Conclusions:

• Matrix stiffness critically affects endothelial glycocalyx expression and integrity.
• Standard stiff culture substrates like glass and plastic are unsuitable for specific endothelial GCX studies.
• Soft matrices are essential for preserving GCX components and accurately studying its role in endothelial cells.