Designing DNA nanostar hydrogels for sequence-specific degradation and antibody release

Area of Science:

• Biomaterials Science
• Nanotechnology
• Biochemistry

Background:

• DNA nanostar (DNAns) hydrogels show promise for in vivo applications like tissue regeneration and drug delivery.
• A quantitative understanding of design principles governing DNAns hydrogel degradation is currently lacking.

Purpose of the Study:

• To investigate how DNAns hydrogel design influences degradation rates.
• To explore the potential for sequence-specific enzymatic degradation in controlled drug delivery.

Main Methods:

• Fabrication of three-armed DNAns hydrogels with varied flexible joints, arm lengths, and mesh sizes.
• Degradation monitoring using restriction enzymes (RE) to cut DNAns structures.
• Assessment of degradation using non-specific endonucleases (DNaseI).

Main Results:

• Removing flexible joints, increasing arm length, or relocating RE sites significantly accelerated hydrogel degradation.
• DNaseI rapidly degraded DNAns hydrogels irrespective of design.
• Antibody release from hydrogels was modulated by sequence-specific enzymes, demonstrating design-dependent degradation.

Conclusions:

• Hydrogel degradation can be predictably controlled by modifying DNAns structural features.
• Sequence-specific enzymatic degradation offers a mechanism for responsive drug delivery systems.
• Provides design principles for engineering DNAns hydrogels with tailored properties and controlled cargo release.