Bladder regeneration by collagen scaffolds with collagen binding human basic fibroblast growth factor

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Urology

Background:

• Basic fibroblast growth factor (bFGF) shows promise for promoting bladder regeneration.
• Current limitations in bFGF's clinical application stem from a lack of targeted delivery methods.
• Collagen-based systems offer potential for localized delivery of growth factors.

Purpose of the Study:

• To develop and evaluate a collagen-based targeted delivery system for basic fibroblast growth factor (bFGF) to enhance bladder regeneration.
• To engineer bFGF with a collagen-binding domain for improved scaffold integration.
• To assess the efficacy of this targeted system in a rat partial cystectomy model.

Main Methods:

• Partial cystectomy was performed on Sprague-Dawley rats.
• Collagen scaffolds were loaded with either collagen-binding domain bFGF, native bFGF, or PBS (control).
• Scaffolds were grafted to host bladders, with evaluations at 30 and 90 days via histology and urodynamics.

Main Results:

• The targeted bFGF delivery system significantly improved bladder histological structure.
• Enhanced vascularization and smooth muscle cell ingrowth were observed in the targeted group.
• Urodynamic assessments indicated improved bladder volume capacity and compliance.

Conclusions:

• A targeted delivery system using collagen-binding domain bFGF with collagen membranes promotes superior bladder regeneration.
• This strategy represents a promising approach for clinical applications in bladder repair.
• The developed system effectively enhances tissue reconstruction and functional recovery at the injury site.