Cited by 65Cancer-related Molecular PathwaysViral-associated cancers and disordersCytomegalovirus and herpesvirus research

MDM2-Dependent Inhibition of p53 Is Required for Epstein-Barr Virus B-Cell Growth Transformation and Infected-Cell Survival

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Forte, Eleonora, Luftig, Micah A.·2009·Journal of Virology

Abstract

Epstein-Barr virus (EBV) growth transformation of primary B lymphocytes into indefinitely proliferating lymphoblastoid cell lines (LCLs) depends on the concerted activities of a subset of viral proteins expressed during latency. EBV drives quiescent B cells into S phase, and consequently, a host response is activated that includes expression of p53 and its target genes. Since LCLs retain wild-type p53, it was of interest to determine what contribution the p53 pathway may have in controlling established LCL growth and EBV-mediated transformation of primary B cells. We found that liberation of p53 through chemical antagonism of one of its major ubiquitin ligases, MDM2, using the small-molecule Nutlin-3 led to apoptosis of established LCLs and suppressed EBV-mediated transformation of primary B cells. The activation of latent p53 induced target genes associated with apoptosis. Furthermore, MDM2 antagonism synergized with NF-κB inhibition in killing LCLs. NF-κB was important to increase steady-state MDM2 protein levels rather than in affecting p53-dependent transcription, suggesting a unique mechanism by which LCLs survive in the presence of a primed p53 pathway. Nutlin sensitivity of EBV-infected cells provides a novel system for studying the pathways that dictate LCL survival and regulate EBV transformation. Finally, MDM2 antagonists may be considered for therapeutic intervention in EBV-associated malignancies expressing wild-type p53.

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  • EBV expresses latency antigens that stabilize MDM2.

    “EBV is associated with several tumour types, and it expresses latency antigens that stabilize MDM2 (Ref. 56).”

    From MDM2, MDMX and p53 in oncogenesis and cancer therapy (2013) · cites this paper as [56]

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Authors
Forte, E., & Luftig, M. A.
Affiliations
Duke Medical Center (US)
Corresponding author
Luftig, Micah A.
Venue
Journal of Virology
Published
2009-03-15
Volume
83
Issue
6
Pages
2491-2499
ISSN
  • 0022-538X (ISSN-L)
  • 1098-5514
OpenAlex
W2107244203
Cited by
65
References
37
Citations by year
2025: 6 · 2024: 3 · 2023: 3 · 2022: 2 · 2021: 3 · 2020: 2 · 2019: 2 · 2018: 2 · 2017: 6 · 2016: 3 · 2015: 3 · 2014: 3 · 2013: 7 · 2012: 5
FWCI
3.33
Type
journal article
Language
en
Open access
Locations
  • Journal of Virology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Allergy and Infectious Diseases (P30AI064518)
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Health Sciences › Medicine › Oncology › Viral-associated cancers and disorders
  • Health Sciences › Medicine › Epidemiology › Cytomegalovirus and herpesvirus research
Keywords
Epstein-Barr virus, MDM2, p53, lymphoblastoid cell lines, Nutlin-3, NF-κB, apoptosis, viral latency, p53 target genes, EBV-associated malignancies
MeSH terms
B-Lymphocytes, Cell Line, Cell Survival, Cell Transformation, Viral, Enzyme Inhibitors, Herpesvirus 4, Human, Humans, Imidazoles, Piperazines, Virus Replication, Tumor Suppressor Protein p53, NF-kappa B, Apoptosis, Proto-Oncogene Proteins c-mdm2

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