Core-Shell Microneedle Gel for Self-Regulated Insulin Delivery

Area of Science:

• Biomaterials Science
• Nanotechnology
• Endocrinology

Background:

• Diabetes management requires precise insulin delivery to maintain blood glucose homeostasis.
• Current insulin delivery methods lack self-regulation and can cause tissue damage.
• Bioinspired systems offer potential for improved, automated glucose control.

Purpose of the Study:

• To develop a painless, self-regulating microneedle patch for smart insulin delivery.
• To create a device with rapid responsiveness and enhanced biocompatibility for diabetes patients.
• To mimic natural enzymatic processes for safe and effective glucose regulation.

Main Methods:

• Fabrication of a core-shell microneedle array patch using degradable cross-linked gel.
• Incorporation of a glucose-specific enzyme and hydrogen peroxide (H2O2)-responsive system for insulin release.
• Coating the microneedles with a H2O2-scavenging enzyme to protect surrounding tissues.

Main Results:

• The microneedle patch demonstrated rapid and responsive insulin delivery triggered by glucose oxidation.
• The H2O2-scavenging enzyme layer effectively protected tissues from oxidative stress.
• In a mouse model of type 1 diabetes, the patch successfully regulated blood glucose levels within the normal range.
• The system exhibited excellent biocompatibility and painless application.

Conclusions:

• The developed bioinspired microneedle patch offers a promising solution for self-regulating insulin delivery.
• This smart patch enhances biocompatibility and safety by mimicking natural protective mechanisms.
• The technology holds potential for improving the quality of life for individuals with type 1 and advanced type 2 diabetes.