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This study investigates the cytotoxicity and the genotoxicity induced by arsenic trioxide As2O3in human laryngeal SQ20B carcinoma cell line. SQ20B cells were exposed to graded concentrations of arsenic trioxide (2 and 5μM) for 48h. Comet assay and γ-H2AX foci formation were used for measuring DNA damages, flow cytometry was used to identify cell cycle alterations and apoptosis, while cell morphology...
The alkaline comet assay is able to identify in individual cells DNA strand breaks associated with different processes. Topoisomerase inhibitors, some of which are used as chemotherapeutic agents, stabilise topoisomerase-DNA cleavable complexes by stimulating DNA strand cleavage and inhibiting religation. This can result in the activation of stress-associated signalling pathways, inducing cell cycle...
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