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A study in cytotoxicity of gentamycin to tissue-cultured bovine corneal endothelial cells and rabbit corneal epithelial cells is reported. When the cultured cells reached confluence, they were exposed to tissue culture media containing gentamycin for 6 hours. We found that 0.5% gentamycin caused significant damage to corneal epithelial cells--diffuse plasmolysis, with scattered cell necrosis and 5% loss. While corneal endothelial cells were exposed to 1.6 mg/ml gentamycin, extensive cell loss (approximately 15%) was observed. The damaged cells recovered their normal morphology after 24 hours. When the concentration of gentamycin increased twice, serious damage to cells occurred. The area of cell loss reached 40%, and the recovery of cellular morphology was much slower. This study demonstrates that gentamycin potential cytotoxicity to corneal epithelium and endothelium, suggesting that gentamycin should be rationally used in the treatment of ocular diseases.
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