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Design of Multistimuli Responsive Hydrogels Using Integrated Modeling and Genetically Engineered Silk-Elastin-Like
Wenwen Huang1, Anna Tarakanova2, Nina Dinjaski1
1Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA.
Advanced Functional Materials
|July 4, 2017
Summary
Researchers developed new silk-elastin copolymers (SELPs) for robust, biocompatible hydrogels. These stimuli-responsive biomaterials offer tunable stiffness for diverse biomedical applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Biotechnology
Background:
- Elastomeric, robust, and biocompatible hydrogels are highly sought after for biomedical applications but are challenging to develop.
- Existing hydrogel fabrication methods often involve harsh conditions (e.g., gamma irradiation, chemical crosslinking) that limit the incorporation of sensitive biomolecules.
Purpose of the Study:
- To engineer a novel family of silk-elastin copolymers (SELPs) capable of forming stimuli-responsive, robust, and biocompatible hydrogels.
- To establish an enzymatic crosslinking strategy for hydrogel fabrication, enabling the preservation of labile components.
- To investigate the mechanical properties and stimuli-responsive behavior of the developed SELP hydrogels.
Main Methods:
- Genetic engineering was employed to create silk-elastin copolymers with specific enzymatic crosslinking sites.
- Hydrogels were fabricated using an enzymatic crosslinking process, avoiding harsh chemical or radiation treatments.
- Mechanical properties, including stiffness, were characterized across a range relevant to soft tissues.
- Stimuli-responsive behavior and tunability through physical modification of silk domains were assessed.
Main Results:
- A new family of genetically engineered silk-elastin copolymers (SELPs) was successfully developed.
- Enzymatic crosslinking enabled the fabrication of versatile hydrogels suitable for incorporating sensitive proteins and cells.
- The SELP hydrogels exhibited sequence-dependent, reversible stimuli-responsive characteristics.
- Hydrogel stiffness was tunable, covering the elasticity range of soft tissues, with secondary control via physical modification of silk domains.
Conclusions:
- The developed SELP hydrogels represent a promising new class of biomaterials offering a rare combination of elastomeric, robust, and biocompatible properties.
- The enzymatic fabrication method enhances versatility for biomedical applications requiring the inclusion of labile biological components.
- Tunable mechanical properties and stimuli-responsiveness position these SELP hydrogels for advanced biomedical materials and device development.
