Abstract
Recent studies showed that arsenic trioxide (As2O3) could induce apoptosis and partial differentiation of leukemic promyelocytes. Here, we addressed the possible mechanisms underlying these two different effects. 1.0 μM As2O3-induced apoptosis was associated with condensation of the mitochondrial matrix, disruption of mitochondrial transmembrane potentials (ΔΨm) and activation of caspase-3 in acute promyelocytic leukemia (APL) cells regardless of their sensitivity to all-trans retinoic acid (ATRA). All these effects were inhibited by dithiothreitol (DTT) and enhanced by buthionine sulfoximine (BSO). Furthermore, BSO could also render HL60 and U937 cells, which had the higher cellular catalase activity, sensitive to As2O3-induced apoptosis. Surprisingly, 1.0 μM As2O3 did not induce the ΔΨm collapse and apoptosis, while 0.1 μM As2O3 induced partial differentiation of fresh BM cells from a de novo APL patient. In this study, we also showed that 0.2 mM DTT did not block low-dose As2O3-induced NB4 cell differentiation, and 0.10.5 μM As2O3 did not induce differentiation of ATRA-resistant NB4-derived sublines, which were confirmed by cytomorphology, expression of CD11b, CD33 and CD14 as well as NBT reduction. Another interesting finding was that 0.10.5 μM As2O3 could also induce differentiation-related changes in ATRA-sensitive HL60 cells. However, the differentiation-inducing effect could not be seen in ATRA-resistant HL60 sublines with RARα mutation. Moreover, low-dose As2O3 and ATRA yielded similar gene expression profiles in APL cells. These results encouraged us to hypothesize that As2O3 induces APL cell differentiation through direct or indirect activation of retinoic acid receptor-related signaling pathway(s), while ΔΨm collapse is the common mechanism of As2O3-induced apoptosis.
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Acknowledgements
This work was supported in part by National Key Programme for Basic Research (973) National Natural Science Foundation of China (NNSFC) research grants No. 39970312 and No. 39730270 (GQC), and a NNSFC award for Outstanding Young Scientists (No. 39725011)(GQC), National Ministry of Public Health (GQC), Shanghai Municipal Foundation for Outstanding Young Researcher (GQC), Samuel Waxman Cancer Research Foundation and Clyde Wu Foundation of Shanghai Institute of Hematology.
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Cai, X., Shen, YL., Zhu, Q. et al. Arsenic trioxide-induced apoptosis and differentiation are associated respectively with mitochondrial transmembrane potential collapse and retinoic acid signaling pathways in acute promyelocytic leukemia. Leukemia 14, 262–270 (2000). https://doi.org/10.1038/sj.leu.2401650
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DOI: https://doi.org/10.1038/sj.leu.2401650
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