Cytotoxicity and genotoxicity of intravitreal adalimumab administration in rabbit retinal cells

Purpose: To assess the cytotoxicity and genotoxicity of intravitreal adalimumab treatment in an animal experimental model using cytological and molecular techniques. Methods: Eighteen rabbits were randomly assigned to three groups: control, adalimumab treatment, and placebo. Cytotoxicity on retinal cells was evaluated using flow cytometry assays to determine the level of apoptosis and necrosis. Genotoxicity was evaluated by comet assays to assess DNA damage, and quantitative real-time polymerase chain reaction (qPCR) was used to evaluate expression of apoptosis-inducing caspases (8 and 3). Results: No cytotoxicity or genotoxicity was observed in any of the two treatment groups (adalimumab and placebo) following intravitreal administration compared with the control group. Flow cytometry analysis revealed that more than 90% of the cells were viable, and only a low proportion of retinal cells presented apoptotic (~10%) or necrotic (