title: Prevalidation of a human cornea construct as an alternative to animal corneas for in vitro drug absorption studies.
abstract: The use of ophthalmic drugs has increased consistently over the past few decades. Currently, most research is conducted using in vivo and ex vivo animal experiments; however, they have many disadvantages, including ethical concerns, high costs, the questionable extension of animal results to humans, and poor standardization. Although several cell culture-based cornea models have been developed, none have been validated and accepted for general use. In this study, a standardized, three-dimensional model of the human cornea (Hemicornea, HC) based on immortalized human corneal cells and cultivated in serum-free conditions was developed for drug absorption studies and prevalidated using compounds with a wide range of molecular characteristics (sodium fluorescein, rhodamine B, fluorescein isothiocyanate-labeled dextran, aciclovir, bimatoprost, dexamethasone, and timolol maleate). The HC model was independently cultured in three different laboratories, and the intralaboratory and interlaboratory reproducibility was analyzed and compared with the rabbit cornea. This analysis showed that the HC has a barrier in the same range as excised animal corneas, although with a higher reproducibility and lower variability. Because of the demonstrated transferability, the HC represents a promising in vitro alternative to the use of ex vivo tissue and offers a well-defined and standardized system for drug absorption studies.
authors.affiliation: Institut für Pharmazeutische Technologie, Technische Universität Braunschweig, Braunschweig, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Hahne
authors.forename: Michaela
authors.initials: M
authors.lastname: Zorn-Kruppa
authors.forename: Gustavo
authors.initials: G
authors.lastname: Guzman
authors.forename: Johanna M
authors.initials: JM
authors.lastname: Brandner
authors.forename: Eleonore
authors.initials: E
authors.lastname: Haltner-Ukomado
authors.forename: Hermann
authors.initials: H
authors.lastname: Wätzig
authors.forename: Stephan
authors.initials: S
authors.lastname: Reichl
mesh_terms: D060433:Administration, Ophthalmic; D000818:Animals; D018929:Cell Culture Techniques; D002460:Cell Line; D019573:Epithelium, Corneal / Q000166:cytology* / Q000378:metabolism* / Q000648:ultrastructure; D005260:Female; D006801:Humans; D009883:Ophthalmic Solutions / Q000008:administration & dosage*; D004364:Pharmaceutical Preparations / Q000008:administration & dosage*; D010599:Pharmacokinetics; D011817:Rabbits; D013552:Swine
chemical_list: D009883:Ophthalmic Solutions; D004364:Pharmaceutical Preparations