Click chemistry functionalization of self-assembling peptide hydrogels.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Hydrogel Chemistry

Background:

• Self-assembling peptide (SAP) hydrogels offer tunable cell microenvironments but traditional functionalization is inflexible and costly.
• Existing methods involve pre-mixing or peptide synthesis, limiting adaptability and increasing expenses.
• Need for a versatile SAP platform for controlled biochemical and mechanical cue delivery.

Purpose of the Study:

• To develop a novel Self-Assembling Peptide (SAP) hydrogel platform, termed 'Click SAPs', compatible with click chemistry.
• To enable facile and flexible functionalization of SAP hydrogels with bioactive molecules.
• To demonstrate the utility of Click SAPs for creating advanced, controllable cellular microenvironments.

Main Methods:

• Incorporation of modified lysine (lysine-alloc) into the SAP sequence to enable thiol-ene click chemistry.
• Functionalization of the SAP hydrogel network with a fluorescent dye, cell adhesion peptide, and MMP-sensitive biosensor.
• Characterization using atomic force microscopy and assessment of cell viability and function within the hydrogels.

Main Results:

• Click SAPs successfully self-assemble into fibers and allow tunable stiffness via concentration adjustment.
• Incorporated molecules (dye, adhesion peptide, biosensor) retain biological activity within the hydrogel.
• Encapsulated cells exhibit high viability and interact with functionalized components.

Conclusions:

• The Click SAP platform provides a versatile and cost-effective method for hydrogel functionalization.
• This approach allows for easier incorporation of diverse bioactive molecules, enhancing control over the cellular microenvironment.
• Click SAPs enable new research avenues for temporal and spatial control of cellular interactions.