Built-In Active Microneedle Patch with Enhanced Autonomous Drug Delivery.

Area of Science:

• Biomedical Engineering
• Drug Delivery Systems
• Nanotechnology

Background:

• Microneedles offer painless drug delivery but are limited by slow diffusion and need for external triggers.
• Existing microneedle technologies often struggle with efficient and deep intradermal payload distribution.

Purpose of the Study:

• To develop an autonomous, degradable microneedle platform for enhanced intradermal drug delivery.
• To utilize magnesium microparticles as an internal engine for rapid and deep payload transport.
• To evaluate the efficacy of this active microneedle system in vitro and in vivo.

Main Methods:

• Incorporation of magnesium microparticles into microneedle patches.
• In vitro release kinetics assessment using IgG antibody through phantom tissue and pigskin.
• In vivo efficacy study in a B16F10 mouse melanoma model with anti-CTLA-4 delivery.

Main Results:

• Magnesium particles react with interstitial fluid, generating H2 bubbles for enhanced payload delivery.
• Demonstrated efficient IgG antibody diffusion through biological barriers.
• Active delivery of anti-CTLA-4 significantly boosted immune response and prolonged survival in mice.
• Spatiotemporal control achieved with zones for rapid burst and sustained release.

Conclusions:

• The developed active microneedle platform provides autonomous, rapid, and deep intradermal drug delivery.
• This technology shows significant therapeutic potential for cancer immunotherapy and other applications.
• The system offers enhanced convenience, cost-effectiveness, and improved treatment outcomes.