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Controlling stiffness in nanostructured hydrogels produced by enzymatic dephosphorylation
Kate Thornton1, Andrew M Smith, Catherine L R Merry
1School of Materials, The University of Manchester, Grosvenor Street, Manchester M1 7HS, UK.
Biochemical Society Transactions
|July 21, 2009
Summary
Enzyme-initiated self-assembly of Fmoc-tyrosine hydrogels was achieved via enzymatic dephosphorylation. This tunable system, controllable by alkaline phosphatase concentration, shows promise for 3D cell culture applications.
Area of Science:
- Biomaterials Science
- Hydrogel Chemistry
- Enzyme Catalysis
Background:
- Self-assembling peptides and hydrogels are crucial in biomaterials.
- Controlling hydrogel properties under physiological conditions remains a challenge.
- Enzymatic methods offer precise control over material formation.
Purpose of the Study:
- To report on enzyme-initiated self-assembly of Fmoc-tyrosine hydrogels.
- To demonstrate control over hydrogel modulus via enzymatic dephosphorylation.
- To explore potential applications in 3D cell culture.
Main Methods:
- Enzymatic dephosphorylation of Fmoc-tyrosine phosphate ester precursors.
- Cryo-scanning electron microscopy (cryo-SEM) and transmission electron microscopy (TEM) for network visualization.
- Oscillatory rheology, fluorescence spectroscopy, and CD spectroscopy for characterization.
- Varying alkaline phosphatase concentration to study its effects.
Main Results:
- Formation of a self-assembling network of interconnecting fibers observed via microscopy.
- Enzymatic dephosphorylation under physiological conditions successfully formed hydrogels.
- Alkaline phosphatase concentration directly influenced gelation time, mechanical properties, and molecular arrangements.
- Demonstrated a highly tuneable and cost-effective gel system.
Conclusions:
- Enzyme-initiated self-assembly provides a controllable method for Fmoc-tyrosine hydrogel formation.
- The developed hydrogel system is tuneable and cost-effective.
- Potential applications exist for this system in three-dimensional cell culture.
