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Functional Nanoparticle-Enhanced Silk Hydrogels for Tissue Engineering Biomaterials.
Olivia K Foster1, Derek Hiscox1, Sawnaz Shaidani1
1Department of Biomedical Engineering, Tufts University, Medford, Massachusetts, USA.
Journal of Biomedical Materials Research. Part A
|June 13, 2025
Summary
This study reinforced silk hydrogels with silk nanoparticles (SNPs) to improve mechanical properties for tissue engineering. The resulting silk-silk composites offer tunable strength and stiffness, enabling advanced biomaterial scaffolding.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Polymer Chemistry
Background:
- Silk fibroin hydrogels are promising for tissue engineering due to biocompatibility and biodegradability.
- Their limited mechanical properties hinder wider application.
- Reinforcement strategies are needed to enhance their utility.
Purpose of the Study:
- To reinforce silk hydrogels using silk nanoparticles (SNPs).
- To create tunable silk-silk composite materials with improved mechanical properties.
- To assess the potential for drug delivery and cell encapsulation.
Main Methods:
- Enzymatic crosslinking of silk fibroin hydrogels.
- Incorporation of 130 nm silk nanoparticles (SNPs) at varying concentrations.
- Fabrication of 3D structures using Freeform Reversible Embedding of Suspended Hydrogels (FRESH) 3D printing.
- Preloading SNPs with epidermal growth factor (EGF) for sustained release studies.
- Encapsulation of dermal fibroblasts to assess cytocompatibility.
Main Results:
- Hydrogel Young's moduli increased from 14 kPa to 67 kPa with increasing SNP concentration.
- FRESH 3D printed structures showed tunable Young's moduli from 17 kPa to 58 kPa.
- Sustained EGF release from SNPs over 15 days was achieved.
- SNP-reinforced hydrogels demonstrated cytocompatibility with dermal fibroblasts.
Conclusions:
- Silk nanoparticles effectively reinforce silk hydrogels, creating tunable silk-silk composites.
- This approach enhances mechanical properties for tissue engineering scaffolds.
- The materials show potential for controlled drug delivery and cell encapsulation applications.
