Low-dose radiation-induced cell death in doxorubicin-sensitive leukemic K562 and resistant leukemic K562/Dox cancer cells associated with ferroptosis induction
Tóm tắt
It has been reported that low-dose total body irradiation techniques can be applied to blood cancers such as leukemia. The aim of this study is to investigate the effect of low-dose radiation-induced cell death via ferroptosis phenomenon in doxorubicin-sensitive leukemic K562 and resistant leukemic K562/Dox cancer cells. The cells were irradiated with X-rays at total doses of 0, 0.02, 0.05, and 0.1 Gy. The cell viability was determined at 48 h post-irradiation. Other biological endpoints related to ferroptosis included intracellular reactive oxygen species (ROS) that were determined at 5, 10, and 30 min post-irradiation. Also, intracellular iron, lipid peroxidation, and glutathione peroxidase (GSH-Px) were determined at 1, 4, and 24 h post-irradiation. The results showed that cell viability significantly decreased in irradiated cells when compared to non-irradiated cells. Intracellular ROS, intracellular iron, and lipid peroxidation increased in irradiated cells at all harvest time points compared to non-irradiated cells. GSH-Px decreased in irradiated cells at all harvest time points compared to non-irradiated cells. These findings suggest that low-dose radiation can induce cell death in doxorubicin-sensitive leukemic K562 and resistant leukemic K562/Dox cancer cells through ferroptosis pathways.
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