UV-Crosslinked Collagen and Gelatin Sheets as Cell Scaffold Materials: Nanoscale Surface Properties and Cell...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cell Biology

Background:

• Collagen and gelatin are vital cell scaffold materials.
• Structural instability under physiological conditions requires crosslinking.
• Chemical crosslinking poses toxicity concerns.

Purpose of the Study:

• Evaluate UV crosslinking as a non-toxic alternative for collagen sheets (CS) and gelatin sheets (GS).
• Assess the impact of UV crosslinking on physicochemical properties and NIH-3T3 fibroblast proliferation.
• Determine optimal UV treatment conditions for scaffold stability and cell compatibility.

Main Methods:

• UV crosslinking (254 nm, 0-180 min) applied to CS and GS.
• Physicochemical characterization: gel fraction, Atomic Force Microscopy (AFM), Fourier Transform Infrared Spectroscopy (FT-IR).
• Cell proliferation assay: CCK-8 for NIH-3T3 fibroblasts.

Main Results:

• UV crosslinking significantly improved gelatin sheet water resistance (22% to 80% gel fraction).
• Both CS and GS showed enhanced elastic modulus, peaking at 60 min UV treatment.
• UV-treated scaffolds significantly increased NIH-3T3 fibroblast proliferation compared to controls.

Conclusions:

• UV crosslinking effectively enhances structural stability and biocompatibility of collagen and gelatin scaffolds.
• Both UV-treated CS and GS are suitable for tissue engineering applications.
• UV treatment optimizes scaffold properties, promoting cell proliferation possibly through chemical modifications beyond mechanical enhancement.