Time-sensitive reversal of hyperplasia in transgenic mice expressing SV40 T antigen

Dagmar Ewald, Minglin Li, Shimon Efrat, Gert Auer, Robert J. Wall, Priscilla A. Furth*, Lothar Hennighausen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The role of viral oncoprotein expression in the maintenance of cellular transformation was examined as a function of time through controlled expression of simian virus 40 T antigen (TAg). Expression of TAg in the submandibular gland of transgenic mice from the time of birth induced cellular transformation and extensive ductal hyperplasia by 4 months of age. The hyperplasia was reversed when TAg expression was silenced for 3 weeks. When TAg expression was silenced after 7 months, however, the hyperplasia persisted even though TAg was absent. Although the polyploidy of ductal cells could be reversed at 4 months of age, cells at 7 months of age remained polyploid even in the absence of TAg. These results support a model of time- dependent multistep tumorigenesis, in which virally transformed cells eventually lose their dependence on the viral oncoprotein for maintenance of the transformed state.

Original languageEnglish
Pages (from-to)1384-1386
Number of pages3
Issue number5280
StatePublished - 6 Sep 1996
Externally publishedYes


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