Cascade Mesophase Transitions of Multi-enzyme Responsive Polymeric Formulations

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Supramolecular Chemistry

Background:

• Synthetic polymer assemblies offer tunable properties for mimicking biological systems.
• Enzymatic degradation provides a stimulus for controlled material transformations.
• Understanding cascade responses is key to developing advanced functional materials.

Purpose of the Study:

• To investigate the sequential enzymatic responses of synthetic polymer assemblies.
• To design and characterize polymer formulations with programmable, multistep transitions.
• To explore the influence of enzyme introduction sequence on material behavior.

Main Methods:

• Synthesis of polyethylene glycol (PEG)-based diblock amphiphiles (DBAs) and triblock amphiphiles (TBAs) responsive to specific enzymes (amidase, esterase).
• Preparation of distinct formulations combining amidase-responsive DBA with esterase-responsive TBA, and vice versa.
• Monitoring cascade mesophase transitions (micelles to hydrogel to dissolved polymers) upon sequential addition of enzymes.

Main Results:

• Formulations exhibited distinct cascade mesophase transitions triggered by enzyme addition.
• The transition pathway depended on the specific polymer composition and the sequence of enzyme introduction.
• Materials transitioned from coassembled micelles to hydrogels, and finally to dissolved polymers upon enzymatic hydrolysis.

Conclusions:

• Polymeric formulations can be designed for programmable, multistep responses to sequential enzymatic stimuli.
• This approach mimics the complex behavior of biological macromolecules and their interactions.
• Offers potential for developing smart biomaterials with controlled degradation and assembly.