Abstract
All-trans-retinoic acid (ATRA) and arsenic trioxide (ATO) induce differentiation and apoptosis in acute promyelocytic leukemia (APL) cells. Here we investigated the role and regulation of death-associated protein-5 (DAP5/p97/NAT1), a novel inhibitor of translational initiation, in APL cell differentiation and apoptosis. We found that ATRA markedly induced DAP5/p97 protein and gene expression and nuclear translocation during terminal differentiation of APL (NB4) and HL60 cells but not differentiation-resistant cells (NB4.R1 and HL60R), which express very low levels of DAP5/p97. At the differentiation inducing concentrations, ATO (<0.5 μM), dimethyl sulfoxide, 1,25-dihydroxy-vitamin-D3, and phorbol-12-myristate 13-acetate also significantly induced DAP5/p97 expression in NB4 cells. However, ATO administered at apoptotic doses (1–2 μM) induced expression of DAP5/p86, a proapoptotic derivative of DAP5/p97. ATRA and ATO-induced expression of DAP5/p97 was associated with inhibition of the phosphatidylinositol 3-kinase (PI3K)/Akt pathway. Furthermore, DAP5/p97 expression was upregulated by inhibition of the PI3K/Akt/mammalian target of rapamycin (mTOR) pathway via LY294002 and via rapamycin. Finally, knockdown of DAP5/p97 expression by small interfering RNA inhibited ATRA-induced granulocytic differentiation and ATO-induced apoptosis. Together, our data reveal new roles for DAP5/p97 in ATRA-induced differentiation and ATO-induced apoptosis in APL and suggest a novel regulatory mechanism by which PI3K/Akt/mTOR pathway inhibition mediates ATRA- and ATO-induced expression of DAP5/p97.
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Abbreviations
- AML:
-
Acute myeloid leukemia
- APL:
-
Acute promyelocytic leukemia
- ATO:
-
Arsenic trioxide
- ATRA:
-
All-trans-retinoic acid
- DAP5:
-
Death-associated protein 5
- DMSO:
-
Dimethyl sulfoxide
- eIF2:
-
Eukaryotic initiation factor 2
- eIF4E:
-
Eukaryotic initiation factor 4E
- FACS:
-
Fluorescence-activated cell sorting
- FITC:
-
Fluorescein isothiocyanate
- IRES:
-
Internal ribosome entry site
- MTOR:
-
Mammalian target of rapamycin
- PBS:
-
Phosphate-buffered saline
- PDCD4:
-
Programmed cell death 4 protein
- PI3K:
-
Phosphatidylinositol 3-kinase
- PMA:
-
Phorbol-12-myristate 13-acetate
- PML:
-
Promyelocytic leukemia
- RARα:
-
Retinoic acid receptor-α
- SiRNA:
-
Small interfering RNA
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Acknowledgments
We would like to thank Karen Ramires for help in conducting our FACS analyses, Kenneth Dunner Jr. in M. D. Anderson Cancer Center’s NCI-funded High Resolution Electron Microscopy Facility for his help in performing electron microscopy, and Pierrette Lo for editing the manuscript. Supported in part by National Cancer Institute grant U54 RFA CA096300.
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B. Ozpolat and U. Akar contributed equally.
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Ozpolat, B., Akar, U., Zorrilla-Calancha, I. et al. Death-associated protein 5 (DAP5/p97/NAT1) contributes to retinoic acid-induced granulocytic differentiation and arsenic trioxide-induced apoptosis in acute promyelocytic leukemia. Apoptosis 13, 915–928 (2008). https://doi.org/10.1007/s10495-008-0222-9
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DOI: https://doi.org/10.1007/s10495-008-0222-9