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- W3000682707 abstract "The biotoxin okadaic acid (OA) is a lipophilic secondary metabolite of marine microalgae. Therefore, OA accumulates in the fatty tissue of various shellfish and may thus enter the food chain. The ingestion of OA via contaminated marine species can lead to the diarrhetic shellfish poisoning syndrome characterized by the occurrence of a series of acute gastrointestinal symptoms in humans. In addition, genotoxicity and tumor-promoting properties of OA might constitute a long-term threat to human health. In order to deepen our understanding of the molecular effects of OA, we compared long-term (14 d) and short-term (24 h and 48 h) apoptotic effects of the compound on human HepaRG hepatocarcinoma cells. Cells were treated either with single doses for 24 and 48 h, respectively, or seven times over a period of 14 d, so that the cumulated quantities of OA in the long-term approach were equal to the single doses upon short-term treatment. Both short-term treatment scenarios led to the induction of apoptosis. Specific caspase activation assays and transcriptional analysis of mRNAs encoding proteins involved in the regulation of apoptosis suggest that OA-induced apoptosis occurs presumably by activation of the intrinsic apoptotic pathway. In contrast, effects were much less pronounced in case of long-term treatment. This is possibly linked to cellular protective mechanisms against low amounts of toxins, e.g. transporter-mediated efflux. In conclusion, our results show a clear concentration- and time-dependency of OA-mediated apoptotic effects in HepaRG cells and contribute to the elucidation of molecular effects of OA." @default.
- W3000682707 created "2020-01-23" @default.
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- W3000682707 date "2020-02-01" @default.
- W3000682707 modified "2023-09-29" @default.
- W3000682707 title "Comparison of long-term versus short-term effects of okadaic acid on the apoptotic status of human HepaRG cells" @default.
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- W3000682707 doi "https://doi.org/10.1016/j.cbi.2020.108937" @default.
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