Visualization of iontophoretic transport paths in cultured and animal skin models

被引:30
作者
Lee, RD
White, HS
Scott, ER
机构
[1] UNIV UTAH,DEPT CHEM,SALT LAKE CITY,UT 84112
[2] ALZA CORP,SPRING LAKE PK,MN 55432
关键词
D O I
10.1021/js960106l
中图分类号
R914 [药物化学];
学科分类号
100701 ;
摘要
Physiological structures associated with iontophoretic paths in hairless mouse skin and two cultured skin models (''EpiDerm'' by Mattek, Corp., and ''SKIN2'' by Advanced Tissue Sciences, Inc.) are reported. Visualization of ionic paths at current densities between 20 and 100 mu A/cm(2) is accomplished by the counterdirectional transport of Fe(CM)(6)(4-) and Fe3+, resulting in the controlled precipitation of colloidal Prussian blue, Fe-4[Fe(CN)(6)](3), at sites of high ionic conductivity. Examination of the Fe-4[Fe(CN)(6)](3)-stained tissues using optical microscopy allows unequivocal assignment of iontophoretic paths to physiological structures in the stratum corneum. Deposition of Fe-4[Fe(CN)(6)](3) occurs exclusively at hair follicles in hairless mouse skin, indicating that these appendages provide highly conductive porous paths during iontophoresis. In contrast, the counterdirectional transport of Fe(CN)(6)(4-) and Fe3+ across cultured skin models, which lack appendages, results in the deposition of Fec [Fe(CN)(6)](3) along the boundaries of corneocytes. This observation suggests that paracellular iontophoretic transport through lipid bilayer regions is the predominant transport path in the absence of low-resistance pores.
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页码:1186 / 1190
页数:5
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