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• W4281777255 abstract "Primaquine (PQ) and Tafenoquine (TQ) are clinically important 8-aminoquinolines (8-AQ) used for radical cure treatment of P. vivax infection, known to target hepatic hypnozoites. 8-AQs can trigger haemolytic anaemia in individuals with glucose-6-phosphate dehydrogenase deficiency (G6PDd), yet the mechanisms of haemolytic toxicity remain unknown. To address this issue, we used a humanized mouse model known to predict haemolytic toxicity responses in G6PDd human red blood cells (huRBCs). To evaluate the markers of eryptosis, huRBCs were isolated from mice 24-48 h post-treatment and analysed for effects on phosphatidylserine (PS), intracellular reactive oxygen species (ROS) and autofluorescence. Urinalysis was performed to evaluate the occurrence of intravascular and extravascular haemolysis. Spleen and liver tissue harvested at 24 h and 5-7 days post-treatment were stained for the presence of CD169+ macrophages, F4/80+ macrophages, Ter119+ mouse RBCs, glycophorin A+ huRBCs and murine reticulocytes (muRetics). G6PDd-huRBCs from PQ/TQ treated mice showed increased markers for eryptosis as early as 24 h post-treatment. This coincided with an early rise in levels of muRetics. Urinalysis revealed concurrent intravascular and extravascular haemolysis in response to PQ/TQ. Splenic CD169+ macrophages, present in all groups at day 1 post-dosing were eliminated by days 5-7 in PQ/TQ treated mice only, while liver F4/80 macrophages and iron deposits increased. Collectively, our data suggest 8-AQ treated G6PDd-huRBCs have early physiological responses to treatment, including increased markers for eryptosis indicative of oxidative stress, resulting in extramedullary haematopoiesis and loss of splenic CD169+ macrophages, prompting the liver to act as the primary site of clearance." @default.
• W4281777255 created "2022-06-13" @default.
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• W4281777255 date "2022-06-03" @default.
• W4281777255 modified "2023-10-16" @default.
• W4281777255 title "Mechanisms of 8‐aminoquinoline induced haemolytic toxicity in a G6PDd humanized mouse model" @default.
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• W4281777255 doi "https://doi.org/10.1111/jcmm.17362" @default.
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