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Molecular basis for viral selective replication in cancer cells: activation of CDK2 by adenovirus-induced cyclin E

Pei-Hsin Cheng1, Xiao-Mei Rao, Kelly M McMasters

  • 1Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, Kentucky, United States of America.

Plos One
|February 26, 2013
PubMed

Insights

Adenoviruses lacking E1b55K replicate in cancer cells by activating cyclin E/CDK2. This complex phosphorylates pRb, promoting viral replication and aiding oncolytic virotherapy development.

Area of Science:

  • Oncolytic virotherapy
  • Molecular biology
  • Cancer research

Background:

  • Adenoviruses (Ads) with E1b55K deletion show oncolytic potential, preferentially replicating in cancer cells.
  • Previous work linked Ad E1B55K protein to cyclin E induction for viral replication, a function less critical in cancer cells with deregulated cyclin E.

Purpose of the Study:

  • To investigate the interaction between cyclin E and CDK2 in Ad-infected cells.
  • To elucidate the role of the cyclin E/CDK2 complex in Ad replication within cancer cells.

Main Methods:

  • Studied Ad-infected cells to analyze cyclin E forms and CDK2 activity.
  • Utilized roscovitine and small interfering RNAs to inhibit CDK2 activity.
  • Assessed pRb phosphorylation and viral replication rates.

Main Results:

  • Ad infection increased large cyclin E (cyclin EL) and cyclin E/CDK2 complex formation.
  • CDK2 phosphorylation at T160 and subsequent pRb phosphorylation at S612 were observed.
  • CDK2 inhibition significantly reduced pRb phosphorylation and viral replication.

Conclusions:

  • Ad-induced cyclin E activates CDK2, which phosphorylates pRb, creating a favorable cellular environment for viral replication.
  • This mechanism provides a molecular basis for the oncolytic replication of E1b-deleted Ads.
  • Findings support the development of novel Ad-based oncolytic virotherapies.

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