Oncogenic Herpesvirus Utilizes Stress-Induced Cell Cycle Checkpoints for Efficient Lytic Replication

Giuseppe Balistreri, Johanna Viiliäinen, Mikko Turunen, Raquel Diaz, Lauri Lyly, Pirita Pekkonen, Juha Rantala, Krista Ojala, Grzegorz Sarek, Mari Teesalu, Oxana Denisova, Karita Peltonen, Ilkka Julkunen, Markku Varjosalo, Denis Kainov, Olli Kallioniemi, Marikki Laiho, Jussi Taipale, Sampsa Hautaniemi, Päivi M. Ojala

Research output: Contribution to journalArticlepeer-review

Abstract

Kaposi’s sarcoma herpesvirus (KSHV) causes Kaposi’s sarcoma and certain lymphoproliferative malignancies. Latent infection is established in the majority of tumor cells, whereas lytic replication is reactivated in a small fraction of cells, which is important for both virus spread and disease progression. A siRNA screen for novel regulators of KSHV reactivation identified the E3 ubiquitin ligase MDM2 as a negative regulator of viral reactivation. Depletion of MDM2, a repressor of p53, favored efficient activation of the viral lytic transcription program and viral reactivation. During lytic replication cells activated a p53 response, accumulated DNA damage and arrested at G2-phase. Depletion of p21, a p53 target gene, restored cell cycle progression and thereby impaired the virus reactivation cascade delaying the onset of virus replication induced cytopathic effect. Herpesviruses are known to reactivate in response to different kinds of stress, and our study now highlights the molecular events in the stressed host cell that KSHV has evolved to utilize to ensure efficient viral lytic replication.

Original languageEnglish (US)
Article numbere1005424
JournalPLoS pathogens
Volume12
Issue number2
DOIs
StatePublished - Feb 2016

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Immunology
  • Molecular Biology
  • Genetics
  • Virology

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