Abstract
In high-risk myelodysplastic syndromes (MDS) and acute myeloid leukemia (AML), blasts constitutively activate the antiapoptotic transcription factor nuclear factor-κB (NF-κB). Here, we show that this NF-κB activation relies on the constitutive activation of the IκB kinase (IKK) complex, which is formed by the IKKα, IKKβ and IKKγ/NF-κB essential modulator (NEMO) subunits. A cell-permeable peptide that mimics the leucine zipper subdomain of IKKγ, thus preventing its oligomerization, inhibited the constitutive NF-κB activation and induced apoptotic cell death in a panel of human MDS and AML cell lines (P39, MOLM13, THP1 and MV4–11). Small interfering RNA-mediated knockdown of the p65 NF-κB subunit or the three IKK subunits including IKKγ/NEMO also induced apoptotic cell death in P39 cells. Cell death induced by the IKKγ/NEMO-antagonistic peptide involved the caspase-independent loss of the mitochondrial transmembrane potential as well as signs of outer mitochondrial membrane permeabilization with the consequent release of cytochrome c, apoptosis-inducing factor and endonuclease G. Primary bone marrow CD34+ cells from high-risk MDS and AML patients also succumbed to the IKKγ/NEMO-antagonistic peptide, but not to a mutated control peptide. Altogether, these data indicate that malignant cells in high-risk MDS and AML cells critically depend on IKKγ/NEMO to survive. Moreover, our data delineate a novel procedure for their therapeutic removal, through inhibition of IKKγ/NEMO oligomerization.
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Abbreviations
- AIF:
-
apoptosis-inducing factor
- AML:
-
acute myeloid leukemia
- BMMNC:
-
bone marrow mononuclear cells
- Casp-3a:
-
activated caspase-3
- Cyt c:
-
cytochrome c
- ΔΨm:
-
mitochondrial transmembrane potential
- DAPI:
-
4′,6-diaminidino-2-phenylindole
- DiOC6(3):
-
3,3′ dihexyloxacarbocyanine iodide
- EndoG:
-
endonuclease G
- FACS:
-
fluorescence-activated cell sorter
- FISH:
-
fluorescent in situ hybridization
- GAPDH:
-
glyceraldehyde-3-phosphate dehydrogenase
- Hsp60:
-
heat-shock protein 60
- IκB:
-
inhibitor of NF-κB
- IKK:
-
IκB kinase
- MDS:
-
myelodysplastic syndrome
- MMP:
-
mitochondrial membrane permeabilization
- NEMO:
-
NF-κB essential modulator
- NF-κB:
-
nuclear factor κB
- PI:
-
propidium iodide
- z-VAD.fmk:
-
N-benzyloxycarbonyl-Val-Ala-Asp-fluoromethylketone
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Acknowledgements
We thank YM Coic and F Baleux (Pasteur Institute, Paris, France) for expert synthesis of the peptides used in this work. GC receives a fellowship from Association NRB Vaincre le Cancer. CF is supported by Fondation pour la Recherche Médicale. JG and SB receive a fellowship from Cancéropôle Ile-de-France and Deutsche Forschungsgemeinschaft, respectively. This work was supported by grants from Association pour la Recherche contre le Cancer (to GK, MV and AI) and European Union (TransDeath, RIGHT), Fondation de France (Comité Leucémies), Cancéropôle Ile-de-France, Ligue contre le Cancer (Département de Seine St Denis), Association Laurette Fugain (to GK) and the International MDS Foundation (to TB).
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Carvalho, G., Fabre, C., Braun, T. et al. Inhibition of NEMO, the regulatory subunit of the IKK complex, induces apoptosis in high-risk myelodysplastic syndrome and acute myeloid leukemia. Oncogene 26, 2299–2307 (2007). https://doi.org/10.1038/sj.onc.1210043
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DOI: https://doi.org/10.1038/sj.onc.1210043
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