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Pharmaceutics 2017, 9(3), 33; doi:10.3390/pharmaceutics9030033

Transdermal Permeation of Drugs in Various Animal Species

Graduate School of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan
Department of Pharmaceutical Sciences, Faculty of Pharmacy and Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan
Received: 31 July 2017 / Revised: 21 August 2017 / Accepted: 28 August 2017 / Published: 6 September 2017
(This article belongs to the Special Issue Recent Technology of Transdermal and Topical Drug Delivery)
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Excised human skin is utilized for in vitro permeation experiments to evaluate the safety and effect of topically-applied drugs by measuring its skin permeation and concentration. However, ethical considerations are the major problem for using human skin to evaluate percutaneous absorption. Moreover, large variations have been found among human skin specimens as a result of differences in age, race, and anatomical donor site. Animal skins are used to predict the in vivo human penetration/permeation of topically-applied chemicals. In the present review, skin characteristics, such as thickness of skin, lipid content, hair follicle density, and enzyme activity in each model are compared to human skin. In addition, intra- and inter-individual variation in animal models, permeation parameter correlation between animal models and human skin, and utilization of cultured human skin models are also descried. Pig, guinea pig, and hairless rat are generally selected for this purpose. Each animal model has advantages and weaknesses for utilization in in vitro skin permeation experiments. Understanding of skin permeation characteristics such as permeability coefficient (P), diffusivity (D), and partition coefficient (K) for each skin model would be necessary to obtain better correlations for animal models to human skin permeation. View Full-Text
Keywords: species difference; skin permeation; transdermal drug delivery; in vitro skin permeation species difference; skin permeation; transdermal drug delivery; in vitro skin permeation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Todo, H. Transdermal Permeation of Drugs in Various Animal Species. Pharmaceutics 2017, 9, 33.

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