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Cell Growth & Differentiation Vol. 11, 231-237, May 2000
© 2000 American Association for Cancer Research


Articles

Accelerated Development of Polyoma Tumors and Embryonic Lethality: Different Effects of p53 Loss on Related Mouse Backgrounds1

Dilip C. Dey2, Roderick P. Bronson2, Jean Dahl, John P. Carroll and Thomas L. Benjamin3

Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115

Abstract

Molecular evidence linking polyoma virus to p53 inactivation is thus far lacking, setting this highly oncogenic virus apart from other DNA tumor viruses. As a biological test for interaction, we studied the effects of p53 loss on development of virus-induced tumors. The absence of p53 led to more rapid tumor development on two different mouse backgrounds, indicating synergism between p53 loss and oncogenic pathways controlled directly by the virus. No effects of p53 on tumor type or frequency were noted. Polyoma tumor-derived cells in culture retained p53, and most of these showed induction of p21CIP1/WAF1 in response to DNA damage. These results indicate that p53 functions are not directly and fully impaired by the virus in the intact host. On one mouse background, it was discovered that loss of p53 resulted in complete embryonic lethality prior to 11 days of gestation. This lethality could be rescued by inclusion of gene(s) from a 129/SvJ background.




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Cancer Research Clinical Cancer Research
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Molecular Cancer Research Cell Growth & Differentiation
Copyright © 2000 by the American Association of Cancer Research.