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SV40 large T antigen targets multiple cellular pathways to elicit cellular transformation

Deepika Ahuja1, M Teresa Sáenz-Robles, James M Pipas

  • 1Department of Biological Sciences, University of Pittsburgh, PA 15260, USA.

Oncogene
|November 22, 2005
PubMed

Insights

Simian virus 40 (SV40) oncoproteins drive cancer by targeting key cellular proteins like p53 and Rb. Further research aims to uncover additional targets and understand SV40

Area of Science:

  • Oncology
  • Virology
  • Molecular Biology

Background:

  • DNA tumor viruses, like simian virus 40 (SV40), utilize oncoproteins to manipulate cellular pathways.
  • SV40 oncoproteins, including large T antigen and small t antigen, are crucial for cellular transformation.
  • Tumor viruses serve as vital tools for identifying cancer-promoting proteins and understanding tumorigenesis.

Purpose of the Study:

  • To elucidate the roles of SV40 large T antigen and small t antigen in cellular transformation.
  • To identify the cellular targets and signaling pathways affected by SV40 oncoproteins.
  • To investigate the cell-type-specific mechanisms underlying SV40-induced oncogenesis.

Main Methods:

  • Extensive examination of the functions of SV40 large T antigen and small t antigen.
  • Analysis of SV40 oncoprotein interactions with cellular targets such as p53, Rb-family proteins, and pp2A phosphatase.
  • Studies involving transgenic mice expressing SV40 oncoproteins to observe in vivo effects.

Main Results:

  • SV40 large T antigen inhibits p53 and Rb-family tumor suppressors, while small t antigen affects pp2A phosphatase activity, both contributing to transformation.
  • SV40 oncoprotein expression in transgenic mice can lead to diverse outcomes, from hyperplasia to invasive carcinoma with metastasis.
  • The cellular consequences of SV40 oncoprotein action are dependent on the specific tissue and cell type.

Conclusions:

  • SV40-induced transformation involves the targeting of critical tumor suppressors and phosphatases.
  • Additional cellular targets of SV40 oncoproteins likely await discovery.
  • Understanding the cell-type-specific mechanisms of SV40 action is key to advancing cancer research.

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