Skin Absorption of Anions: Part One. Methodology for In Vitro Cutaneous Absorption Measurements
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Measurement of skin absorption of ions requires specific experimental protocols regarding the use of pig skin as a model, the viability of excised skin in water medium over 24 h, the presence of endogenous ions, and evaluation of the contributions of facilitated transport through ion channels and ion transporters.
Absorption experiments of halide anions F−, Cl−, Br− and I− in excised skin were performed in Franz diffusion cells. Experiments were performed on human and porcine skin under various conditions so as to define and validate experimental protocols.
The distributions of endogenous ions and the absorption kinetics of halide ions were similar in both porcine and human skin models. Fresh skin kept its viability over 24 h in salt-free water, allowing experiments following OECD guidelines. Permeation increased in the order F− < Cl− < Br− < I− for all receptor media and skin samples. Absorption was larger in fresh skin due to the transport through chloride channels or exchangers.
Skin absorption experiments of ions in Franz cells rely on working with fresh excised skin (human or porcine) and pure water as receptor fluid. Experiments with chloride blockers or frozen/thawed skin allow discriminating passive diffusion and facilitated transport.
KEYWORDSanion halide ion permeation skin absorption
Ca2+ activated Cl− channels
Cystic fibrosis transmembrane conductance regulator
Hank’s balanced salt solution. It contains 1 g.L−1 of glucose in its composition.
Inductively coupled plasma optical emission spectrometry
Sodium-chloride symporter (also known as Na+-Cl− co-transporter)
Serum saline (physiological serum saline solution NaCl 9 g.L−1) containing 1 g.L−1 of glucose
Ultrapure water (resistivity >18 MΩ.cm at 25°C) containing 1 g.L−1 of glucose
ACKNOWLEDGMENTS AND DISCLOSURES
The support of the Ministère de l’Enseignement Supérieur et de la Recherche (France) is gratefully acknowledged.
- 7.Lin P, Gruenstein E. Pathways of Cl− transport in human fibroblasts. Am J Physiol. 1988;255:112–22.Google Scholar
- 16.Chen T, Singleton L, Imbert I, Perrin A, Gondran C, McMullen R, et al. Effect of UVB irradiation on intracellular sodium level and chloride channel CFTR expression in normal human keratinocytes and skin biopsies. J Investig Dermatol. 2009;129(supplement 1s):S133,796.Google Scholar
- 17.von Zglinicki T, Lindberg M, Roomans GM, Forslind B. Water and ion distribution profiles in human skin. Acta Derm Venereol. 1993;73:340–3.Google Scholar
- 23.OECD. Guidance document for the conduct of skin absorption studies. OECD series on testing and assessment: number 28. 2004.Google Scholar
- 28.EN ISO 10304-1:2009: water quality. Determination of dissolved anions by liquid chromatography of ions. Determination of bromide, chloride, fluoride, nitrate, nitrite, phosphate and sulfate.Google Scholar
- 37.Lyklema J. Fundamentals of interface and colloid science. Vol 1, Chap 5. London: Academic Press. pp. 5.15–5.31.Google Scholar
- 43.Elisei R, Vivaldi A, Ciampi R, Faviana P, Basolo F, Santini F, et al. Treatment with drugs able to reduce iodine efflux significantly increases the intracellular retention time in thyroid cancer cells stably transfected with sodium iodide symporter complementary deoxyribonucleic acid. J Clin Endocrinol Metab. 2006;91:2389–95.CrossRefPubMedGoogle Scholar