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Arsenic trioxide-induced neuroblastoma cell death is accompanied by proteolytic activation of nuclear Bax.

Karlsson, Jenny LU ; Pietras, Alexander LU ; Beckman, Siv LU ; Pettersson, Helen LU ; Larsson, Christer LU and Påhlman, Sven LU (2007) In Oncogene 26(42). p.6150-6159
Abstract
Arsenic trioxide (As2O3) is toxic to multidrug-resistant neuroblastoma cells in vivo and in vitro. In neuroblastoma, As2O3 does not exert its cell death-promoting effects via a classical apoptotic pathway. A death mechanism involving proteolytic cleavage of Bax to a p18 form seems to be of importance, because inhibition of Bax cleavage coincides with diminished cell death. As existing models of cell death implicate Bax in the intrinsic apoptotic pathway, triggering death after Bax translocation to the mitochondria, we investigated the cellular localization of p18 Bax by subcellular fractionation. After As2O3 treatment, p18 Bax was only present in nuclei-enriched, mitochondria-depleted fractions. Cytoplasmic p21 Bax levels decreased,... (More)
Arsenic trioxide (As2O3) is toxic to multidrug-resistant neuroblastoma cells in vivo and in vitro. In neuroblastoma, As2O3 does not exert its cell death-promoting effects via a classical apoptotic pathway. A death mechanism involving proteolytic cleavage of Bax to a p18 form seems to be of importance, because inhibition of Bax cleavage coincides with diminished cell death. As existing models of cell death implicate Bax in the intrinsic apoptotic pathway, triggering death after Bax translocation to the mitochondria, we investigated the cellular localization of p18 Bax by subcellular fractionation. After As2O3 treatment, p18 Bax was only present in nuclei-enriched, mitochondria-depleted fractions. Cytoplasmic p21 Bax levels decreased, whereas total (p21 and p18) nuclear Bax increased. Overexpressed p21 Bax localized to the cytoplasm and nuclei, whereas overexpressed p18 Bax localized to extra-nuclear structures only. The inability of overexpressed p18 Bax to locate to the nucleus, and the As2O3-induced reduction of p21 Bax in the cytosol, suggest an As2O3-induced mechanism where p18 Bax gets cleaved and 'trapped' in the nucleus. This model is strengthened by the observation that calpain, the protease responsible for p18 Bax generation, is present in the nuclei, and that nuclear calpain is induced by increasing As2O3 and Ca2+ levels. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Arsenic trioxide, neuroblastoma, nuclear localization, Bax, calpain
in
Oncogene
volume
26
issue
42
pages
6150 - 6159
publisher
Nature Publishing Group
external identifiers
  • wos:000249401300005
  • scopus:34548702003
ISSN
1476-5594
DOI
10.1038/sj.onc.1210439
language
English
LU publication?
yes
id
7b11629e-4f64-4bfb-80d8-265ed79543a5 (old id 167821)
alternative location
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=17404572&dopt=Abstract
date added to LUP
2007-07-11 12:24:28
date last changed
2017-01-01 05:10:53
@article{7b11629e-4f64-4bfb-80d8-265ed79543a5,
  abstract     = {Arsenic trioxide (As2O3) is toxic to multidrug-resistant neuroblastoma cells in vivo and in vitro. In neuroblastoma, As2O3 does not exert its cell death-promoting effects via a classical apoptotic pathway. A death mechanism involving proteolytic cleavage of Bax to a p18 form seems to be of importance, because inhibition of Bax cleavage coincides with diminished cell death. As existing models of cell death implicate Bax in the intrinsic apoptotic pathway, triggering death after Bax translocation to the mitochondria, we investigated the cellular localization of p18 Bax by subcellular fractionation. After As2O3 treatment, p18 Bax was only present in nuclei-enriched, mitochondria-depleted fractions. Cytoplasmic p21 Bax levels decreased, whereas total (p21 and p18) nuclear Bax increased. Overexpressed p21 Bax localized to the cytoplasm and nuclei, whereas overexpressed p18 Bax localized to extra-nuclear structures only. The inability of overexpressed p18 Bax to locate to the nucleus, and the As2O3-induced reduction of p21 Bax in the cytosol, suggest an As2O3-induced mechanism where p18 Bax gets cleaved and 'trapped' in the nucleus. This model is strengthened by the observation that calpain, the protease responsible for p18 Bax generation, is present in the nuclei, and that nuclear calpain is induced by increasing As2O3 and Ca2+ levels.},
  author       = {Karlsson, Jenny and Pietras, Alexander and Beckman, Siv and Pettersson, Helen and Larsson, Christer and Påhlman, Sven},
  issn         = {1476-5594},
  keyword      = {Arsenic trioxide,neuroblastoma,nuclear localization,Bax,calpain},
  language     = {eng},
  number       = {42},
  pages        = {6150--6159},
  publisher    = {Nature Publishing Group},
  series       = {Oncogene},
  title        = {Arsenic trioxide-induced neuroblastoma cell death is accompanied by proteolytic activation of nuclear Bax.},
  url          = {http://dx.doi.org/10.1038/sj.onc.1210439},
  volume       = {26},
  year         = {2007},
}