Glucose-Responsive Gold Nanocluster-Loaded Microneedle Patch for Type 1 Diabetes Therapy

Area of Science:

• Biomaterials Science
• Nanotechnology
• Endocrinology

Background:

• Diabetes mellitus, particularly type 1, necessitates precise blood glucose regulation.
• Current insulin delivery methods often involve invasive procedures and lack responsiveness to glucose fluctuations.
• Developing convenient, noninvasive, and responsive therapeutic strategies is crucial for diabetes management.

Purpose of the Study:

• To develop and evaluate a closed-loop microneedle (MN)-array patch for transdermal and responsive insulin delivery.
• To integrate glucose-responsive gold nanoclusters (GNCs) into alginate-based MNs for enhanced functionality.
• To assess the efficacy of the GNC-loaded MN-array patch in regulating blood glucose levels in a type 1 diabetes model.

Main Methods:

• Alginate-based MN-array patches were fabricated using a two-step casting and centrifuging process.
• Glucose-responsive gold nanoclusters (GNCs) were integrated into the microneedles.
• In vitro studies assessed glucose-responsive insulin release.
• In vivo experiments were conducted on type 1 diabetic mice to evaluate blood glucose regulation and therapeutic effects.

Main Results:

• Integration of GNCs enhanced the mechanical strength and skin penetration of the MN-array patches.
• The GNC-loaded MNs demonstrated glucose-responsive, closed-loop insulin release both in vitro and in vivo.
• A single transdermal application of the patch maintained normoglycemic ranges in mice for up to 2.8 days.
• The patches significantly reduced diabetic symptoms in the treated mice.

Conclusions:

• Glucose-responsive GNC-loaded MN-array patches offer a minimally invasive and effective approach for insulin delivery.
• This technology provides a promising alternative for managing type 1 diabetes.
• The developed patch system demonstrates potential for convenient and responsive long-term glucose control.