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Arsenic trioxide induces apoptosis of myeloid leukemia cells by activation of caspases

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Abstract

The primary objective of this study was to determine whether caspases are involved in arsenic trioxide(ATO)-induced apoptosis of human myeloid leukemia cells. A secondary objective was to determine whether apoptosis induced by ATO compared with VP-16 is differentially affected by an activator of protein kinase C (PKC), phorbol 12-myristate 13-acetate (PMA), which has been reported to inhibit apoptosis induced by some chemotherapeutic agents. NB4 and HL60 cells were incubated with ATO in the presence and absence of the caspase protease inhibitors Z-VAD.fmk or Y-VAD. cho. Apoptosis was assessed by morphology, DNA laddering and flow cytometry. Poly (ADP-ribose) polymerase (PARP) cleavage was used as a marker for the activation of caspases. PARP cleavage occurred during ATO-induced apoptosis in both NB4 and HL60 cells. Z-VAD.fmk, a broad-spectrum inhibtor, could block ATO-induced apoptosis and PARP cleavage, whilst Y-VAD. cho, a selective inhibitor of caspase 1, had no such effect. PMA pre-incubation for up to 8 hours under conditions known to activate PKC had no effect on either ATO- or VP-16-induced apoptosis. We conclude that in cultured myeloid leukemia cells ATO-induced apoptosis is executed by caspases from the distal, PARP-cleaving part of the activation cascade and that PKC activation has no effect on apoptosis induced by either ATO or VP-16 in these cells.

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Author notes

  1. Xiao-Jun Huang

    Present address: Institute of Hematology, People's Hospital, Beijing Medical University, 100044, Beijing, People's Republic of China

Authors and Affiliations

  1. Department of Oncology, Montefiore Medical Center, The Albert Einstein Cancer Center, 111 East 210th Street, 10467, Bronx, NY, USA

    Xiao-Jun Huang, Peter H Wiernik, Robert S Klein & Robert E Gallagher MD

Authors
  1. Xiao-Jun Huang
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  2. Peter H Wiernik
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  3. Robert S Klein
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  4. Robert E Gallagher MD
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Correspondence to Robert E Gallagher MD.

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Huang, XJ., Wiernik, P.H., Klein, R.S. et al. Arsenic trioxide induces apoptosis of myeloid leukemia cells by activation of caspases. Med Oncol 16, 58–64 (1999). https://doi.org/10.1007/BF02787360

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  • DOI: https://doi.org/10.1007/BF02787360

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