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Related Experiment Videos

Transfollicular percutaneous absorption. Skin model for quantitative studies.

B Illel1, H Schaefer

  • 1Centre International de Recherches Dermatologiques (C.I.R.D.), Valbonne, France.

Acta Dermato-Venereologica
|January 1, 1988
PubMed
Summary
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Shunt diffusion significantly enhances percutaneous absorption. Our study on appendage-free skin models shows that this route dramatically increases hydrocortisone penetration compared to normal skin.

Area of Science:

  • Dermatology
  • Pharmacokinetics
  • Skin Physiology

Background:

  • Percutaneous absorption is crucial for topical drug delivery.
  • It involves both transepidermal and transappendageal (shunt) routes.
  • The relative contribution of shunt diffusion needs further elucidation.

Purpose of the Study:

  • To investigate the significance of shunt diffusion in percutaneous absorption.
  • To compare hydrocortisone diffusion in appendage-free skin versus normal skin.
  • To quantify the impact of shunt pathways on drug penetration.

Main Methods:

  • Utilized a model of appendage-free rat skin created by thermal treatment (60°C water, 1 min).
  • Assessed in vitro hydrocortisone diffusion across intact, appendage-free skin.

Related Experiment Videos

  • Compared diffusion parameters with those of normal skin under identical experimental conditions.

    • Main Results:

    • Appendage-free skin exhibited a 50-fold increase in steady-state flux compared to normal skin.
    • Total hydrocortisone diffusion over 24 hours was also significantly higher in the absence of appendages.
    • These preliminary findings highlight the substantial role of shunt pathways.

    Conclusions:

    • Transappendageal (shunt) diffusion is a major contributor to percutaneous absorption.
    • Minimizing or understanding shunt pathways is critical for optimizing topical drug delivery.
    • Further research can leverage appendage-free models to study drug absorption mechanisms.