Injectable Hydrogel versus Plastically Compressed Collagen Scaffold for Central Nervous System Applications

Area of Science:

• Biomaterials Science
• Neural Engineering
• Regenerative Medicine

Background:

• Central Nervous System (CNS) repair is challenging due to limited regenerative capacity.
• Neural engineering offers novel therapeutic approaches for CNS disorders.
• Collagen is a preferred biomaterial for neural tissue engineering due to its biocompatibility and ECM similarity.

Purpose of the Study:

• Compare properties of plastically compressed collagen hydrogels with injectable collagen-genipin and collagen-only hydrogels.
• Evaluate the effects of genipin cross-linking versus plastic compression on collagen hydrogels.
• Assess the impact of these methods on clinical translatability for CNS therapy.

Main Methods:

• Fabrication and characterization of three types of collagen hydrogels: plastically compressed, collagen-genipin injectable, and collagen-only.
• Assessment of hydrogel properties, including stiffness and injectability.
• Evaluation of methods for clinical translatability in CNS applications.

Main Results:

• Injectable collagen-genipin hydrogels demonstrated superior properties for clinical translation.
• Full collagen compression resulted in excessively stiff hydrogels (up to 2300 kPa).
• Partial compression (up to 75%) of collagen hydrogels achieved CNS-compatible stiffness.

Conclusions:

• Injectable collagen-genipin hydrogels are a promising material for clinical CNS therapy.
• Partially compressed collagen 3D hydrogels offer tunable stiffness mimicking natural tissues.
• These findings facilitate the development of neural repair applications through biomaterial engineering.