Browse by author
Lookup NU author(s): Dr Jane Carr-Wilkinson, Bojidar Goranov, Dr Chris RedfernORCiD, Dr Laura GambleORCiD, Professor John LunecORCiD, Professor Deborah Tweddle
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
Background: MYCN oncogene amplification occurs in 20-25% of neuroblastomas and is associated with a poor prognosis. We previously reported that MYCN amplified (MNA) p53 wild-type neuroblastoma cell lines failed to G 1 arrest in response to irradiation, but this could not be attributed to MYCN alone. Hypothesis: Genes co-amplified with MYCN and/or the predominant cell type, neuronal (N) or substrate adherent (S) phenotypes determine the downstream response to DNA damage in neuroblastoma cell lines. Results: No genes with a potential role in cell cycle regulation were consistently co-amplified in the MNA cell lines studied. High MYCN expressing NBLW-N cells failed to G 1 arrest following irradiation and showed impaired induction of p21 and MDM2, whereas low MYCN expressing NBLW-S cells underwent a G 1 arrest with induction of p21 and MDM2. Conversely N type cells underwent higher levels of apoptosis than S type cells. Following p53 knockdown in SHSY5Y N-type cells there was a decrease in apoptosis. Methods: The MYCN amplicons of five MNA and two non-MNA cell line were mapped using 50K Single Nucleotide Polymorphism (SNP) arrays. One MNA (NBL-W) and one non-MNA neuroblastoma cell line (SKNSH) were sub-cloned into N and S-type cells and the p53 pathway investigated after irradiation induced DNA damage. To determine the role of p53 it was knocked down using siRNA. Conclusions: The downstream response to DNA damage in p53 wild-type neuroblastoma cell lines is p53-dependent, and determined both by the morphological subtype and MYCN expression.
Author(s): Carr-Wilkinson J, Griffiths R, Elston R, Goranov B, Redfern CPF, Gamble LD, Lunec J, Tweddle DA
Publication type: Article
Publication status: Published
Journal: Cell Cycle
Year: 2011
Volume: 10
Issue: 21
Pages: 3778-3787
Print publication date: 01/11/2011
ISSN (print): 1538-4101
ISSN (electronic): 1551-4005
Publisher: Landes Bioscience
URL: http://dx.doi.org/10.4161/cc.10.21.17973
DOI: 10.4161/cc.10.21.17973
Altmetrics provided by Altmetric