Surface modification of hydrogels based on poly(2-hydroxyethyl methacrylate) with extracellular matrix proteins

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Cell Biology

Background:

• Poly(2-hydroxyethyl methacrylate-co-methacrylic acid) hydrogels are widely explored for biomedical applications.
• Surface modification of hydrogels is crucial for enhancing cell interactions and tissue integration.
• Collagen, laminin, and fibronectin are key extracellular matrix proteins influencing cell behavior.

Purpose of the Study:

• To investigate the in situ deposition of collagen I onto hydrogel surfaces.
• To examine the subsequent attachment of laminin or fibronectin onto the collagen-modified hydrogel.
• To evaluate the impact of these surface modifications on mesenchymal stromal cell and astrocyte adhesion and growth.

Main Methods:

• Infrared attenuated total reflection spectroscopy was employed for real-time surface analysis.
• Hydrogel surface properties were modulated by adjusting pH for optimal collagen adsorption.
• Cell adhesion and proliferation assays were performed on modified and unmodified hydrogel surfaces.

Main Results:

• Collagen I deposition on the hydrogel surface was dependent on solution pH, with optimal adsorption observed at pH 6.5.
• Adsorbed collagen layers, further modified with laminin or fibronectin, demonstrated stability in physiological solutions.
• Mesenchymal stromal cells and astrocytes exhibited significantly enhanced adhesion and growth on hydrogels modified with collagen and/or other extracellular matrix proteins.

Conclusions:

• Optimized pH conditions facilitate effective collagen I surface modification of hydrogels.
• Co-immobilization of collagen with laminin or fibronectin creates a cell-adhesive surface.
• These modified hydrogels show promise as scaffolds for regenerative medicine and tissue engineering applications.