Abstract
We investigated the possible mechanisms of All-trans retinoic acid (ATRA)-promoted apoptosis induced by α-tocopherol succinate (α-TS) in freshly isolated leukemic cells obtained from chronic myeloid leukemic patients. α-TS at 50 μM concentration significantly decreased superoxide dismutase (SOD) activity and reduced glutathione (GSH) by 29% and 25%, respectively, and increased lipid peroxidation level by 33%. Though 10 μM ATRA did not affect these parameters, it further significantly enhanced α-TS-induced changes. Bax expression in the leukemic cells was increased by treatment with ATRA, α-TS, and their combination to 40%, 240%, and 320%, respectively, without any change in Bcl2 and p53 expression. C-myc was down regulated by treatment with ATRA, α-TS and their combination to 22%, 48.5%, and 52%, respectively. In conclusion, the data reveal that enhancement of α-TS-induced apoptosis by ATRA in leukemic cells was through up regulation of Bax and lipid peroxidation, and down regulation of c-myc and GSH.
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Khanduja, K.L., Kumar, S., Varma, N. et al. Enhancement in alpha-tocopherol succinate-induced apoptosis by all-trans-retinoic acid in primary leukemic cells: role of antioxidant defense, Bax and c-myc. Mol Cell Biochem 319, 133–139 (2008). https://doi.org/10.1007/s11010-008-9886-2
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DOI: https://doi.org/10.1007/s11010-008-9886-2