Abstract

AbstractA three-dimensional human tissue model has been developed in our laboratory and used as a substrate for assessing ocular cytotoxicity and irritancy potential. The full-thickness model is a coculture of dermal fibroblasts and epithelial cells (keratinocytes). Metabolically and mitotically active fibroblasts are seeded onto medical-grade nylon mesh, where they attach and secrete collagen and extracellular matrix proteins. Then keratinocytes are seeded onto the top of this submerged stromal tissue, and the tissue grows into a multilayered pithelium. Histologic examination of this cellular coculture system reveals a cellular organization similar to the rabbit/human cornea. The resulting substrate has been used effectively to study the effects of a variety of test compounds (surfactants, powders, creams) at diluted or full-strength concentrations in a time-course assay. The protocol mimics the way in which in vivo animal testing (Draize eye testing) is performed. The treated tissue is assayed for cytot...

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