Recombinant silk-elastinlike protein polymer displays elasticity comparable to elastin.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Native aortic elastin provides essential mechanical properties to blood vessels.
• Developing synthetic biomaterials with comparable elasticity is crucial for cardiovascular tissue engineering.

Purpose of the Study:

• To evaluate the mechanical properties of a recombinant silk-elastinlike protein copolymer, SELP-47K.
• To compare the performance of SELP-47K films to native aortic elastin.
• To investigate the effects of processing and cross-linking on film properties.

Main Methods:

• Tensile stress-strain analysis
• Stress-relaxation and creep analysis
• Raman spectroscopy
• Scanning electron microscopy (SEM)

Main Results:

• Non-cross-linked SELP-47K films surpassed native aortic elastin in ultimate tensile strength, elastic modulus, extensibility, and resilience.
• Chemical cross-linking significantly enhanced the mechanical properties of SELP-47K films.
• Raman spectroscopy confirmed antiparallel beta-sheet crystals in silklike blocks, contributing to physical cross-links.
• SEM revealed microstructural changes consistent with polymer chain alignment upon processing and deformation.

Conclusions:

• SELP-47K is a promising protein copolymer for creating elastic biomaterial films.
• SELP-47K films exhibit mechanical properties comparable to native aortic elastin.
• The combination of silk and elastin sequences in SELP-47K yields robust and elastic biomaterials.