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Biological safety studies of gemifloxacin mesylate and related substances

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Abstract

Purpose: The aim of this study was to evaluate the cytotoxic, phototoxic, genotoxic and photogenotoxic potential of gemifloxacin mesylate (GFM), its main synthetic impurity (SI) and one isolated and structurally elucidated degradation product (DP). Methods: The neutral red uptake (NRU) and reduction of 2,5-diphenyl-3,-(4,5-dimethyl-2-thiazolyl)tetrazolium bromide (MTT) assays were performed as in vitro endpoints to evaluate cytotoxicity and phototoxicity in a 3T3 cell line, and predict toxicity and/or phototoxicity after systemic administration of the drug. The in vitro alkaline single-cell electrophoresis (comet) assay was used to evaluate the genotoxic and photogenotoxic potential of the substances using the same cell line. Results: The results showed that the SI and the DP are more cytotoxic and phototoxic than the drug GFM using the 3T3 cell line. In the comet assay, the drug GFM was found to be more genotoxic and photogenotoxic than its related substances. Conclusions: Our findings highlight the relevance of the biological safety studies to increase the knowledge regarding the toxic potential of the related substances, which can be associated with the drug side effects and toxicity.

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Paim, C.S., Nogueira, D.R., Mitjans, M. et al. Biological safety studies of gemifloxacin mesylate and related substances. Photochem Photobiol Sci 12, 805–812 (2013). https://doi.org/10.1039/c3pp25369d

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