A method to visualize transdermal nickel permeation in mouse skin using a nickel allergy patch

Area of Science:

• Dermatology
• Materials Science
• Biophysics

Background:

• Metal patch testing is crucial for diagnosing metal-induced contact dermatitis.
• Current methods lack clarity on metal ion transdermal permeation and can cause adverse skin reactions due to high concentrations.
• Understanding metal ion diffusion is essential for optimizing patch test protocols.

Purpose of the Study:

• To visualize and quantify the time-dependent transdermal permeation of nickel (Ni) ions in mouse skin.
• To investigate the diffusion behavior of Ni across skin layers.
• To provide insights for developing safer and more effective metal patch tests.

Main Methods:

• Utilized synchrotron radiation X-ray fluorescence (SR-XRF) for elemental mapping.
• Employed micro-focused particle-induced X-ray emission (micro-PIXE) for high-resolution imaging.
• Visualized the cross-sectional and time-dependent diffusion of Ni in mouse skin models.

Main Results:

• Nickel permeation in mouse skin was visualized in a time-dependent manner.
• Maximum Ni permeation was observed at 24 hours post-patch application.
• Permeated Ni was predominantly found in the epidermis, with significant diffusion into the dermis beyond the basal layer.

Conclusions:

• The study successfully visualized Ni transdermal permeation using advanced X-ray techniques.
• Findings suggest optimal parameters for metal patch testing duration and concentration.
• This methodology offers a potential tool for refining diagnostic patch tests for metal allergies.