Fibrillogenesis in collagen hydrogels accelerated by carboxylated microbeads

Area of Science:

• Biomaterials Science
• Biophysics
• Materials Engineering

Background:

• Collagen type I is a key biomaterial for 3D cell culture and tissue engineering, forming various architectures like gels and scaffolds.
• Fibrillogenesis, the process of collagen fibril formation, is influenced by numerous factors including collagen source, pH, temperature, and concentration.
• Understanding and controlling collagen fibrillogenesis is crucial for developing advanced biomaterials with tailored properties.

Purpose of the Study:

• To investigate the impact of embedded microbeads on the fibrillogenesis of collagen type I hydrogels.
• To quantify the effects of different microbead types on collagen gelation and fibril formation kinetics.
• To elucidate the mechanisms by which microbeads influence collagen self-assembly.

Main Methods:

• Fabrication of collagen type I hydrogels with embedded carboxylated fluorescent microbeads and silica microbeads.
• Utilizing turbidity assay to monitor gelation kinetics and fibril formation.
• Employing confocal reflectance microscopy for visualizing collagen fibril structure and distribution.

Main Results:

• Embedded microbeads were observed to modify the fibrillogenesis process in collagen type I hydrogels.
• Carboxylated fluorescent microbeads accelerated the gelation process by 3.6 times compared to pure collagen hydrogels.
• Silica microbeads exhibited an opposite effect, slowing down collagen fibril formation by a factor of 1.9.

Conclusions:

• Microbeads act as significant modulators of collagen type I fibrillogenesis.
• Carboxylate microbeads likely serve as nucleation sites, promoting early collagen fibril binding.
• The findings provide insights into controlling collagen matrix formation for enhanced tissue engineering and biomaterial applications.