Viscoelastic Supramolecular Hyaluronan-Peptide Cross-Linked Hydrogels

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Viscoelasticity is crucial for designing functional hydrogels.
• Hyaluronan (HA) is a key component of the native extracellular matrix.
• Developing hydrogels with tunable mechanical properties is essential for biomedical applications.

Purpose of the Study:

• To design and characterize physically cross-linked hydrogels with tunable viscoelasticity.
• To investigate the relationship between hydrogel structure and mechanical properties.
• To evaluate the cytocompatibility and cell interaction of these HA-peptide hydrogels.

Main Methods:

• Synthesized hydrogels by coupling supramolecular-assembled peptides to hyaluronan.
• Modified peptide sequences to modulate viscoelastic properties, including stress relaxation rates.
• Utilized techniques to analyze gel mesh size, secondary structures (e.g., β-sheets), and hydrogen bonding.
• Assessed cell spreading of dermal fibroblasts and encapsulation of primary human T cells.

Main Results:

• Achieved tunable viscoelasticity in HA-peptide hydrogels, with stress relaxation up to 60% in 10 minutes.
• Demonstrated that peptide sequence modification effectively targets viscoelasticity with minimal impact on stiffness.
• Identified correlations between high viscoelasticity, large mesh sizes, β-sheet structures, and hydrogen bonding.
• Confirmed cytocompatibility and observed enhanced dermal fibroblast spreading in highly viscoelastic gels.
• Successfully encapsulated primary human T cells within the HA-peptide hydrogels.

Conclusions:

• Physically cross-linked HA-peptide hydrogels offer tunable viscoelasticity for biomaterial design.
• These hydrogels can effectively modulate cell morphology and behavior.
• The developed hydrogels show promise for applications in tissue engineering and regenerative medicine, particularly for mimicking native tissue microenvironments.