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Biotoxin production is a characterizing aspect of the physiology and ecology of several marine organisms. In this study the cytotoxic effect of crude extracts from jellyfish Pelagia noctiluca, Chrysaora hysoscella and Aurelia aurita (Cnidaria: Scyphozoa) against cultured human keratinocytes NCTC 2544 was evaluated by 3- (4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) Assay and Neutral Red Uptake (NRU). Low cytotoxic effects were observed with NRU, while MTT showed a dose-dependent effect, with a "plateau" at highest protein concentrations. Therefore, crude extraxts didn't show effect on lysosomes but MTT test emphasized cell survival decrease and a "plateau" effect at high extract doses which could be related with the inhibition of the mitochondrial dehydrogenase activity.
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