A self-healing hydrogel as an injectable instructive carrier for cellular morphogenesis.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Vascular Biology

Background:

• Direct progenitor cell transplantation faces challenges in survival and efficacy for vascular diseases due to compromised tissues.
• Injectable hydrogels offer cell protection but often have uncontrolled cross-linking and lack bio-functionality.
• Existing self-healing hydrogels lack the necessary biological cues for effective tissue morphogenesis.

Purpose of the Study:

• To develop an injectable, self-healing hydrogel carrier for endothelial progenitor cells.
• To enhance the survival and functionality of transplanted cells for vascular regeneration.
• To create a biomaterial that supports vascular network formation (morphogenesis).

Main Methods:

• Fabrication of a gelatin (Gtn)-based hydrogel cross-linked with oxidized dextran (Odex) via dynamic imine bonds.
• Evaluation of the hydrogel's self-healing properties after syringe injection.
• Assessment of cell protection, controlled placement, and vascular network formation in vitro and in vivo.

Main Results:

• The Gtn-l-Odex hydrogels exhibited self-healing capabilities upon injection, protecting progenitor cells from shear stress.
• The hydrogels allowed for controllable spatial and temporal delivery of cells.
• The biomaterial supported cell adhesion and proteolytic activity, promoting complex vascular network formation.

Conclusions:

• This study presents the first injectable, self-healing hydrogel with inherent bio-functionality for vascular morphogenesis.
• The developed Gtn-l-Odex hydrogel system shows significant promise for improving regenerative therapies by enhancing progenitor cell delivery and function.
• This innovative biomaterial could accelerate tissue healing and the treatment of vascular-related diseases.