The N-terminal common domain of simian virus 40 large T and small t antigens acts as a transformation suppressor of the HER-2/neu oncogene.

Abstract:

:Overexpression of HER-2/neu (also known as c-erbB-2) proto-oncogene frequently occurs in many different types of human cancers, including ovarian carcinoma, and is known to enhance tumor metastasis and chemoresistance. Previous studies showed that inhibition of HER-2/neu expression by various agents, such as adenovirus E1A and simian virus 40 large T, can lead to suppression of tumorigenicity of HER-2/neu-overexpressing cancer cells. Here we report that T/t-common, which contains the N-terminal common domain of simian virus 40 large T and small t antigens, could specifically repress the HER-2/neu promoter. When the coding sequence of T/t-common was stably transfected into the HER-2/neu-overexpressing human ovarian carcinoma SK-OV-3 cells, the expression of HER-2/neu was dramatically reduced by the expression of T/t-common. Accordingly the tumorigenic potential of these T/t-common-expressing clones, including the ability to grow anchorage-independently and the ability to induce tumor in nu/nu mice, was also drastically suppressed. Furthermore, when T/t-common was transiently cotransfected with the activated genomic neu into NIH3T3 cells, the transforming activity of the latter was suppressed by T/t-common in soft-agarose microcolony formation assays. Taken together, these data suggest that T/t-common may act as a transformation suppressor of the HER-2/neu oncogene. Oncogene (2000).

journal_name

Oncogene

journal_title

Oncogene

authors

Lin YC,Peng JM,Wang WB

doi

10.1038/sj.onc.1203582

subject

Has Abstract

pub_date

2000-05-18 00:00:00

pages

2704-13

issue

22

eissn

0950-9232

issn

1476-5594

journal_volume

19

pub_type

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