Transdermal Delivery of siRNA through Microneedle Array

Area of Science:

• Dermatology
• Biotechnology
• Gene Therapy

Background:

• Aberrant gene expression drives numerous skin conditions, including alopecia, psoriasis, and skin cancer.
• Current small interfering RNA (siRNA) delivery methods, like hypodermic needles, are painful and site-limited.
• Microneedle arrays present a promising alternative for noninvasive transdermal delivery of therapeutic agents.

Purpose of the Study:

• To evaluate the efficacy of solid silicon microneedle arrays for delivering cholesterol-modified Gapdh siRNA to mouse ear skin.
• To assess the potential of microneedle-mediated siRNA delivery for treating skin diseases noninvasively.

Main Methods:

• Development and utilization of a solid silicon microneedle array for transdermal delivery.
• Administration of cholesterol-modified Gapdh siRNA into mouse ear skin via microneedle arrays.
• Quantification of siRNA permeation and Gapdh gene expression reduction in skin tissue.

Main Results:

• Microneedle arrays facilitated effective permeation of siRNA into the skin.
• Significant reduction of Gapdh gene expression (up to 66%) was observed in the treated ear skin.
• No significant accumulation of siRNA was detected in major organs, indicating localized and safe delivery.

Conclusions:

• Solid silicon microneedle arrays provide an effective and noninvasive method for delivering siRNA to the skin.
• This technology holds potential for developing new topical therapies for various gene-expression-related skin disorders.
• Microneedle arrays offer a less painful and more targeted alternative to conventional injection methods for siRNA delivery.