Self-Assembled Hydrogel from Pyrene-Modified Peptide as 3D Matrices for Neuronal Cell

Area of Science:

• Biomaterials Science
• Supramolecular Chemistry
• Cell Biology

Background:

• Self-assembled hydrogels are crucial for biomimetic 3D cell culture.
• Achieving stability and functionality under physiological conditions is a significant challenge.

Purpose of the Study:

• To design and characterize pyrene-modified peptides for tunable hydrogel formation.
• To evaluate the physical, chemical, and biological properties of these hydrogels for potential applications.

Main Methods:

• Peptide synthesis and modification with pyrene.
• Hydrogel formation studies across various pH conditions.
• Molecular dynamics simulations for mechanism elucidation.
• Structural analysis using electron microscopy and spectroscopy.
• Rheological testing for mechanical properties and self-healing assessment.
• Neuronal cell culture to assess viability, attachment, and growth.

Main Results:

• Py-L3K3 peptides uniquely formed stable, fluorescent hydrogels at neutral and basic pH.
• Molecular dynamics simulations identified pH-dependent clustering as the gelation mechanism.
• Py-L3K3 hydrogels exhibited nanofibrillar networks, β-sheet-rich structures, viscoelasticity, and self-healing.
• Py-L3K3 supported neuronal cell viability, attachment, and growth under physiological conditions.

Conclusions:

• Py-L3K3 represents a novel peptide-based hydrogel with tunable properties and enhanced stability.
• Its biocompatibility and support for neuronal cells highlight its potential for neuronal engineering.
• Py-L3K3 is a promising candidate for injectable regenerative biomaterials and advanced 3D cell culture scaffolds.