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Lateral drug diffusion in human nails.

Biji B Palliyil1, Cong Li, Suzan Owaisat

  • 1Department of Pharmaceutical Sciences, School of Pharmacy, Temple University, 3307 N Broad Street, Suite 413, Philadelphia, Pennsylvania, 19140, USA.

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|June 28, 2014
PubMed
Summary
This summary is machine-generated.

Passive lateral diffusion of ciclopirox olamine (CPO) in human nails significantly reduces transungual drug permeation. Minimizing peripheral nail area in experiments is crucial for accurate in vitro data that reflects in vivo conditions.

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Area of Science:

  • Pharmacology
  • Biophysics
  • Dermatology

Background:

  • Transungual drug delivery is crucial for treating nail fungal infections.
  • Understanding drug diffusion within the nail plate is essential for optimizing treatment efficacy.
  • Passive lateral diffusion within the nail plate can impact drug permeation rates.

Purpose of the Study:

  • To demonstrate passive lateral diffusion of ciclopirox olamine (CPO) in the human nail plate.
  • To investigate the effect of this lateral diffusion on the passive transungual permeation of CPO.
  • To establish optimal experimental conditions for in vitro transungual permeation studies.

Main Methods:

  • Utilized a novel suspended nail experiment to visualize lateral diffusion using methyl red sodium salt (MR) as a tracer dye.
  • Assessed the in vitro transungual permeation of CPO across human toenails with varying surface areas (25 mm², 49 mm², 81 mm²).
  • Correlated the concentrations of CPO and MR in application and peripheral areas to confirm diffusion patterns.

Main Results:

  • Demonstrated significant passive lateral diffusion of CPO within the human nail plate.
  • Observed a decrease in CPO permeation flux with increasing toenail surface area.
  • Found a positive correlation between CPO and MR concentrations, confirming lateral diffusion.
  • Noted that lateral diffusion reduces in vitro transungual drug permeation and prolongs lag-time.

Conclusions:

  • Passive lateral diffusion of CPO profoundly impacts its transungual permeation in human toenails.
  • Experimental designs for in vitro transungual permeation studies should minimize the peripheral nail area around the application site.
  • This optimization is necessary to obtain reliable data that accurately mimics in vivo drug behavior.