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This study was designed to determine if previous approaches to eliminate fibroblast contamination in different cells types would be successful in eliminating fibroblast contamination from human and mouse primary corneal epithelial cell cultures, with the primary goal being to describe a simple, easy, and effective method to culture fibroblast-free primary mouse and human corneal epithelial cell cultures. Primary human and mouse corneal stromal cells and epithelial cells were isolated and cultured from human corneal rims and mouse corneas, respectively. Several approaches previously used in other tissue types were evaluated using corneal epithelial cells and mixtures of fibroblasts and epithelial cells to determine the most effective purification method. Methods evaluated included 0.25% trypsin-EDTA, low temperature, mitomycin-C, and dispase. Degree of fibroblast contamination was examined using light microscopy evaluation of cell phenotype, immunofluorescence and western blotting using cell type-specific markers. Anti-pancytokeratin (PanCK) was used as the epithelial immunofluorescence label, and anti-α smooth muscle actin (αSMA) as the fibroblast immunofluorescence label. Epithelial western blot antibodies included PanCK, keratin 12, and E-cadherin, while αSMA, collagen 1A1 and collagen 3A1 were used to identify fibroblasts. Fibroblast contamination of human and mouse primary cornea epithelial cell cultures was best controlled using the 0.25% trypsin-EDTA method. The other methods examined were not effective at eliminating cornea fibroblast contamination. Trypsin-EDTA digestion is a simple and effective method for controlling fibroblast contamination of cultured primary human and mouse corneal epithelial cells.

A Method for Eliminating Fibroblast Contamination in Mouse and Human Primary Corneal Epithelial Cell Cultures