Spinal cord tissue engineering via covalent interaction between biomaterials and cells

Area of Science:

• Biomaterials Science
• Neuroscience
• Regenerative Medicine

Background:

• Cell interactions with biomaterials are crucial for regulating cell behavior.
• While noncovalent interactions are well-studied, the impact of covalent cell-biomaterial interactions remains largely unexplored.
• Understanding these covalent interactions is key to advancing tissue regeneration strategies.

Purpose of the Study:

• To investigate the effects of covalent conjugation between biomaterials and cells on neural regeneration after spinal cord injury (SCI).
• To develop and evaluate a combined strategy using covalent conjugation for improved neural repair.

Main Methods:

• Utilized metabolic azido-labeled neural progenitor cells conjugated to dibenzocyclooctyne-modified collagen fibers.
• Employed dibenzocyclooctyne-modified lipid nanoparticles containing edaravone (ROS scavenger) for targeted delivery.
• Tested the combined strategies in a rat SCI model.

Main Results:

• Covalent conjugation significantly enhanced neural progenitor cell adhesion, spreading, and differentiation compared to noncovalent methods.
• Targeted delivery of edaravone via lipid nanoparticles improved the SCI microenvironment by scavenging reactive oxygen species (ROS).
• The combined covalent strategies promoted significant neural regeneration in the rat SCI model.

Conclusions:

• Covalent interactions between cells and biomaterials represent a promising strategy for enhancing neural regeneration.
• This approach offers a significant advancement over noncovalent methods for SCI treatment.
• The findings highlight the potential of covalent conjugation in regenerative medicine for complex injuries.