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- W1600572148 abstract "Within 24 hr after oral administration of the antimalarial artesunate to rats on Day 10 or 11 postcoitum (pc), there is depletion of embryonic erythroblasts (EEbs), leading to embryo malformation and death. The proximate agent is dihydroartemisinin (DHA), the primary metabolite. We investigated the causes of EEb depletion by evaluating effects of DHA on EEbs in whole embryo culture (WEC). Rat embryos cultured starting on Day 9 pc were treated with 1 or 7 μM DHA for 24 hr starting after 19 hr of culture (∼Day 10 pc) and for 2 to 12 hr starting after 43 hr of culture (∼Day 11 pc). DHA effects indicating the depletion of EEbs were paling of the visceral yolk sac and reductions in visible blood cells, H&E‐stained normal (Type II or III) EEbs, and dividing (BrdU‐stained) EEbs. DHA‐induced abnormal cell division was indicated by increases in symmetric and asymmetric binuclear cells. DHA‐induced apoptosis was indicated by increases in TUNEL‐ and Caspase‐3‐positive cells and EEbs with fragmented nuclei. In addition, although the overall number of EEbs was decreasing, DHA caused increases in the numbers of circulating early‐stage (Type I or earlier) EEbs that could not be accounted for by cell division, suggesting the release of new, less sensitive erythroblasts from the yolk sac. In summary, treatment of Day 10 or 11 pc rat embryos with DHA in WEC resulted in defective and arrested cell division in EEbs followed by apoptosis, suggesting a mechanism for their depletion after artesunate treatment in vivo." @default.
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- W1600572148 date "2013-12-01" @default.
- W1600572148 modified "2023-10-16" @default.
- W1600572148 title "Dihydroartemisinin (DHA) Treatment Causes an Arrest of Cell Division and Apoptosis in Rat Embryonic Erythroblasts in Whole Embryo Culture" @default.
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- W1600572148 doi "https://doi.org/10.1002/bdrb.21088" @default.
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