Highly Permeable DNA Supramolecular Hydrogel Promotes Neurogenesis and Functional Recovery after Completely...

Area of Science:

• Biomaterials Science
• Neuroscience
• Regenerative Medicine

Background:

• Mammalian spinal cord regeneration is limited after severe injury.
• Stem cell transplantation is promising but challenged by the lesion microenvironment.
• Delivery material permeability is a critical, understudied factor.

Purpose of the Study:

• To design and evaluate a DNA hydrogel with high permeability for spinal cord repair.
• To assess functional recovery and neural network formation after spinal cord gap bridging.

Main Methods:

• Fabrication of a DNA hydrogel with enhanced permeability.
• Surgical implantation into a 2 mm spinal cord gap in Sprague-Dawley rats.
• Assessment of hindlimb motor function, motor-evoked potentials, and histological analysis of neural regeneration.

Main Results:

• The DNA hydrogel successfully bridged the 2 mm spinal cord gap.
• Rats showed recovery of basic hindlimb function and detectable motor-evoked potentials.
• A renascent neural network formed, with new synapses facilitating signal transmission.

Conclusions:

• Highly permeable DNA hydrogels can promote spinal cord repair and functional recovery.
• This approach facilitates stem cell integration and neural network regeneration.
• The adaptable hydrogel system shows potential for clinical translation and other tissue engineering applications.