Transfected mouse c-jun can inhibit transformation of primary rat embryo fibroblasts

Doron Ginsberg, Syu Ichi Hirai, Orit Pinhasi-Kimhi, Moshe Yaniv, Moshe Oren

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The c-jun gene, which encodes a transcriptional regulatory protein, is the cellular homologue of the transforming gene of avian sarcoma virus 17. In an attempt to assess the biological activities of mouse c-jun, we studied the consequences of its overproduction in an in vitro transformation assay. A c-jun expression plasmid failed to cooperate with either ras, myc or mutant p53 in this focus formation assay. On the other hand, it dramatically inhibited the ability of various oncogene combinations to elicit foci upon transfection into primary rat embryo fibroblasts. Deletion plasmids lacking either the transactivating domain or the leucine repeat of c-jun still displayed a pronounced inhibitory activity. On the contrary, a plasmid encoding only the first 187 amino acids of c-jun had no such activity. The data suggests that enhanced c-jun expression may interfere with the induction or proliferation of transformed cells in this system, and that the inhibitory activity resides in the C-terminal half of the molecule.

Original languageEnglish
Pages (from-to)669-672
Number of pages4
Issue number4
StatePublished - Apr 1991
Externally publishedYes


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