The cell death response to the ROS inducer, cobalt chloride, in neuroblastoma cell lines according to p53 status

  • Authors:
    • Christophe Stenger
    • Thomas Naves
    • Mireille Verdier
    • Marie-Helene Ratinaud
  • View Affiliations

  • Published online on: June 16, 2011     https://doi.org/10.3892/ijo.2011.1083
  • Pages: 601-609
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Abstract

Cobalt chloride (CoCl2), a hypoxia-mimetic agent, induces reactive oxygen species (ROS) generation, leading to cell death. Divergent data have been reported concerning p53 implication in this apoptotic mechanism. In this study, we studied cobalt-induced cell death in neuroblastoma cell lines carrying wild-type (WT) p53 ( SHSY5Y) and a mutated DNA-binding domain p53 [SKNBE(2c)]. CoCl2 induced an upregulation of p53, p21 and PUMA expression in WT cells but not in SKNBE(2c). In SHSY5Y cells, p53 serine-15 phosphorylation appeared early (6 h) in the mitochondria, and also in the nucleus after 12 h. In contrast, in SKNBE(2c) cells, the slight nuclear signal disappeared with CoCl2 treatment. In SHSY5Y cells, a mitochondrial pathway dependent on caspases [collapse of mitochondrial transmembrane potential (∆Ψmt), caspase 3 and 9 activation], was activated in a time-dependent manner. SKNBE(2c) cells exhibited a delay in the cell death executive phase linked to a caspase-independent pathway, involving apoptosis inducing factor nuclear translocation, but also an autophagic process attested by LC3-II expression and cathepsin-B activation. The downregulation of p53 in SHSY5Y cells by siRNA induced a cell death pathway related to the one observed in SKNBE(2c) cells. Finally, CoCl2 induced time-dependent canonical p53 mitochondrial apoptosis in the WT p53 cell line, and caspase-independent cell death in cells with a mutated or KO p53.

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September 2011
Volume 39 Issue 3

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Stenger C, Naves T, Verdier M and Ratinaud M: The cell death response to the ROS inducer, cobalt chloride, in neuroblastoma cell lines according to p53 status. Int J Oncol 39: 601-609, 2011
APA
Stenger, C., Naves, T., Verdier, M., & Ratinaud, M. (2011). The cell death response to the ROS inducer, cobalt chloride, in neuroblastoma cell lines according to p53 status. International Journal of Oncology, 39, 601-609. https://doi.org/10.3892/ijo.2011.1083
MLA
Stenger, C., Naves, T., Verdier, M., Ratinaud, M."The cell death response to the ROS inducer, cobalt chloride, in neuroblastoma cell lines according to p53 status". International Journal of Oncology 39.3 (2011): 601-609.
Chicago
Stenger, C., Naves, T., Verdier, M., Ratinaud, M."The cell death response to the ROS inducer, cobalt chloride, in neuroblastoma cell lines according to p53 status". International Journal of Oncology 39, no. 3 (2011): 601-609. https://doi.org/10.3892/ijo.2011.1083