Related Experiment Video
Updated: Aug 15, 2026
07:48
Engineering a Bilayered Hydrogel to Control ASC Differentiation
Published on: May 25, 2012
Vascularization effect of basic fibroblast growth factor released from gelatin hydrogels with different
1Institute for Frontier Medical Sciences, Kyoto University, Research Center for Biomedical Engineering, Japan.
Biomaterials
|November 11, 1999
Summary
Biodegradable acidic gelatin hydrogels control basic fibroblast growth factor (bFGF) release for sustained neovascularization. Basic gelatin hydrogels show rapid bFGF release and limited vascularization, highlighting the importance of controlled release for therapeutic effects.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Drug Delivery
Background:
- Biodegradable hydrogels are promising for tissue regeneration and drug delivery.
- Controlling the release kinetics of growth factors is crucial for therapeutic efficacy.
- Gelatin hydrogels offer biocompatibility but require modification for controlled release.
Purpose of the Study:
- To investigate the influence of gelatin isoelectric point (IEP) and water content on hydrogel properties and basic fibroblast growth factor (bFGF) release.
- To evaluate the in vivo neovascularization potential of bFGF-loaded gelatin hydrogels.
- To establish a correlation between hydrogel characteristics, bFGF release kinetics, and therapeutic outcomes.
Main Methods:
- Preparation of acidic (IEP 5.0) and basic (IEP 9.0) gelatin hydrogels via glutaraldehyde crosslinking.
- Tuning hydrogel water content by varying gelatin and glutaraldehyde concentrations.
- Incorporation of bFGF into hydrogels and in vitro release studies in phosphate-buffered saline (PBS) at 37°C.
- Subcutaneous implantation of bFGF-loaded hydrogels in mice to assess biodegradation and neovascularization.
Main Results:
- Acidic gelatin hydrogels exhibited controlled bFGF release (approx. 30% in 1 day) due to poly-ion complexation, while basic gelatin hydrogels showed rapid, near-complete release via diffusion.
- Hydrogel degradation rate in vivo correlated positively with water content for both acidic and basic types.
- Significant neovascularization was observed around acidic gelatin hydrogels, with induction period dependent on water content; basic gelatin hydrogels showed transient, less effective vascularization.
Conclusions:
- Biodegradation of acidic gelatin hydrogels enables controlled release of bFGF, leading to sustained neovascularization dependent on hydrogel water content.
- The rapid initial burst release of bFGF from basic gelatin hydrogels results in transient vascularization, possibly due to receptor downregulation.
- Tailoring gelatin hydrogel properties, specifically IEP and water content, is critical for optimizing growth factor delivery and achieving desired therapeutic effects in tissue engineering.
