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Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides
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Boosted Cross-Linking and Characterization of High-Performing Self-Assembling Peptides
Maria Gessica Ciulla1, Raffaele Pugliese1,2, Fabrizio Gelain1,3
1Institute for Stem-Cell Biology, Regenerative Medicine and Innovative Therapies, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy.
Nanomaterials (Basel, Switzerland)
|February 15, 2022
Summary
This study developed stiff self-assembling peptide (SAP) biomaterials for tissue engineering. Chemical cross-linking significantly enhanced SAP stiffness, enabling applications in regenerating skin, muscle, and lung tissues.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Nanotechnology
Background:
- Tissue engineering requires biomimetic, nanostructured materials with specific mechanical properties.
- Self-assembling peptides (SAPs) are promising but typically form soft hydrogels, limiting their use for harder tissues.
- Stiff peptidic materials are needed for effective regeneration of various tissues.
Purpose of the Study:
- To design and characterize novel self-assembling peptides (SAPs) for enhanced chemical cross-linking.
- To achieve significantly increased stiffness in SAP-based hydrogels for tissue engineering applications.
- To explore the potential of stiff SAPs for regenerating medium-to-hard tissues like skin, muscle, and lung.
Main Methods:
- Design and synthesis of novel SAPs tailored for cross-linking reactions.
- Utilized 4-(N-Maleimidomethyl) cyclohexane-1-carboxylic acid 3-sulpho-N-hydroxysuccinimide ester (Sulfo-SMCC) mediated cross-linking.
- Employed an additional orthogonal cross-linking strategy to further enhance material properties.
- Characterized the nanostructure and mechanical properties (G' values) of the cross-linked SAPs.
- Investigated the role of beta-structures in the cross-linking efficiency of (LKLK)3-based SAPs.
Main Results:
- Achieved G' values of approximately 500 kPa using Sulfo-SMCC cross-linking.
- Reached remarkable G' values of 840 kPa with the additional orthogonal cross-linking.
- Demonstrated that cross-linking reinforces existing nanostructures and requires a strong presence of beta-structures.
- Successfully increased SAP stiffness towards the megapascal (MPa) range.
Conclusions:
- Developed a strategy to create stiff peptidic biomaterials from SAPs.
- Achieved significant improvements in SAP stiffness, approaching the mechanical properties of target tissues.
- This advancement broadens the applicability of biomimetic SAP technology for tissue engineering, including skin, muscle, and lung regeneration.
