In vitro safety of intravitreal moxifloxacin for endophthalmitis treatment
Abstract
PURPOSE: To investigate the safety of moxifloxacin for intravitreal application in a cell culture model. SETTING: Department of Ophthalmology, Ludwig-Maximilians-Universität, Munich, Germany. METHODS: Primary human retinal pigment epithelium (RPE) cells, ARPE19 cells, and primary optic nerve head astrocyte (ONHA) cells were treated with concentrations of moxifloxacin ranging from 10 to 750 microg/mL. Possible toxic effects and median inhibitory concentration were evaluated after 24 hours as well as under conditions of oxidative stress. After treating the RPE and ONHA cell lines with tumor necrosis factor-alpha (TNF-alpha; 10 microg/mL), lipopolysaccharides (LPS; 20 microg/mL), and interleukin-6 (IL-6; 20 microg/mL), the effects of moxifloxacin on cellular viability under conditions of inflammation were investigated. Toxicity was evaluated by measuring the inhibition of RPE cell proliferation with the tetrazolium dye-reduction assay (MTT; 3-[4,5-dimethylthiazol- 2-yl]-2,5-diphenyl tetrazolium bromide). Cell viability was quantified by a microscopic live/dead assay. RESULTS: At concentrations higher than 150 microg/mL, moxifloxacin had adverse effects on primary RPE, ARPE19, and ONHA cell proliferation and viability. Lower concentrations did not affect RPE or ONHA cell proliferation and viability when administered for 24 hours. No significant decrease in proliferation and viability was observed after preincubation with TNF-alpha, LPS, and IL-6 for 24 hours and subsequent…
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