An injectable scaffold based on temperature-responsive hydrogel and factor-loaded nanoparticles for application in...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Controlled release of functional factors is vital for therapeutic cell migration in tissue repair.
• Selective release of multiple factors is needed for synergistic cell guidance in biomedical applications.

Purpose of the Study:

• To develop an injectable system for controlled release of SDF-1 and VEGF to guide mesenchymal stem cells (MSCs) and endothelial cells (ECs) migration and proliferation.
• To investigate the role of nanoparticle and hydrogel properties in selective factor release and cell behavior.

Main Methods:

• Development of a temperature-responsive hydrogel system encapsulating two types of nanoparticles.
• Loading of stromal cell-derived factor-1 (SDF-1) and vascular endothelial growth factor (VEGF) into distinct nanoparticles.
• In vitro and in vivo experiments to assess cell migration, proliferation, and vascularization.

Main Results:

• The developed hydrogel system demonstrated selective release of SDF-1 and VEGF.
• The system successfully guided MSCs and ECs migration and proliferation, leading to vascularization.
• Nanoparticle and hydrogel properties (size, charge, biocompatibility) significantly influenced selective release and cell behavior.

Conclusions:

• The injectable hydrogel system effectively controls the release of multiple growth factors for targeted cell guidance.
• This approach shows promise for enhancing in situ vascularization in tissue repair and regeneration applications.
• The study highlights the importance of material properties in designing effective cell-based therapies.