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. 1996 Jan;70(1):68–77. doi: 10.1128/jvi.70.1.68-77.1996

Induction of susceptibility to tumor necrosis factor by E1A is dependent on binding to either p300 or p105-Rb and induction of DNA synthesis.

J Shisler 1, P Duerksen-Hughes 1, T M Hermiston 1, W S Wold 1, L R Gooding 1
PMCID: PMC189789  PMID: 8523594

Abstract

The introduction of the adenovirus early region 1A (E1A) gene products into normal cells sensitizes these cells to the cytotoxic effects of tumor necrosis factor (TNF). Previous studies have shown that the region of E1A responsible for susceptibility is CR1, a conserved region within E1A which binds the cellular proteins p300 and p105-Rb at nonoverlapping sites. Binding of these and other cellular proteins by E1A results in the induction of E1A-associated activities such as transformation, immortalization, DNA synthesis, and apoptosis. To investigate the mechanism by which E1A induces susceptibility to TNF, the NIH 3T3 mouse fibroblast cell line was infected with viruses containing mutations within E1A which abrogate binding of some or all of the cellular proteins to E1A. The results show that TNF susceptibility is induced by E1A binding to either p300 or p105-Rb. E1A mutants that bind neither p300 nor p105-Rb do not induce susceptibility to TNF. Experiments with stable cell lines created by transfection with either wild-type or mutant E1A lead to these same conclusions. In addition, a correlation between induction of DNA synthesis and induction of TNF sensitivity is seen. Only viruses which induce DNA synthesis can induce TNF sensitivity. Those viruses which do not induce DNA synthesis also do not induce TNF sensitivity. These data suggest that the mechanisms underlying induction of susceptibility to TNF by E1A are intimately connected to E1A's capacity to override cell cycle controls.

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Selected References

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