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. 1989 Jun;63(6):2718–2725. doi: 10.1128/jvi.63.6.2718-2725.1989

Inhibition of simian virus 40 T-antigen expression by cellular differentiation.

D N Estervig 1, P Minoo 1, C Y Tzen 1, R E Scott 1
PMCID: PMC250766  PMID: 2542584

Abstract

Murine 3T3T stem cells transfected with pSV3neo DNA were employed to study the effects of somatic cell differentiation on simian virus 40 (SV40) T-antigen expression. This experimental approach was used because the 3T3T cell line is a well-characterized in vitro adipocyte differentiation system and the pSV3neo plasmid contains the early region of the SV40 genome and a selective marker, G418 resistance. Cell clones containing stably integrated pSV3neo which expressed T antigen were isolated in G418-containing medium. Most of these cell clones differentiated poorly. However, several clones retained the ability to efficiently differentiate into adipocytes, and with these cell clones, it was established that adipocyte differentiation markedly repressed T-antigen expression. The differentiation-specific repression of T-antigen expression did not result from a loss of proliferative potential associated with terminal differentiation, because it was observed in adipocytes that could be restimulated to proliferate. In such cells, restimulation of cell growth induced reactivation of T-antigen expression. Repression of T-antigen expression was also demonstrated during differentiation of SV40 T-antigen-immortalized human keratinocytes. These results establish that the process of cellular differentiation can repress T-antigen expression in at least two distinct biological systems.

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