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Transfollicular percutaneous absorption. Skin model for quantitative studies
1Centre International de Recherches Dermatologiques (C.I.R.D.), Valbonne, France.
Acta Dermato-Venereologica
|January 1, 1988
Summary
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.
- 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.