DNA Hydrogels with Programmable Condensation, Expansion, and Degradation for Molecular Carriers

Area of Science:

• Biomaterials Science
• Molecular Engineering
• Drug Delivery Systems

Background:

• Molecular carriers are crucial for targeted therapeutic delivery of drugs and genes.
• DNA hydrogels offer programmable cargo encapsulation and stimuli-responsive release.
• A key limitation of DNA hydrogels is their susceptibility to nuclease degradation in physiological environments.

Purpose of the Study:

• To develop a method for controlling the enzymatic degradation of DNA hydrogels.
• To enhance the protective capabilities of DNA hydrogels for encapsulated cargo.
• To enable stimuli-responsive release of cargo from DNA hydrogels.

Main Methods:

• Utilized cation-mediated condensation and expansion to modulate DNA hydrogel properties.
• Investigated the effect of spermine condensation on nuclease resistance.
• Examined the role of sodium ions in reversing condensation and restoring degradability.

Main Results:

• Spermine-condensed DNA hydrogels exhibited high resistance to enzymatic degradation.
• Sodium ions induced expansion of condensed DNA hydrogels, restoring their degradability.
• Demonstrated controllable condensation, expansion, and degradation of DNA hydrogels.

Conclusions:

• Cation-mediated condensation and expansion offer a simple yet effective strategy to control DNA hydrogel enzyme resistance.
• This approach enhances DNA hydrogel stability for cargo protection and enables controlled release at the target site.
• Developed DNA hydrogels show significant potential as effective molecular carriers for biomedical applications.