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. 1991 Dec;10(12):3839–3849. doi: 10.1002/j.1460-2075.1991.tb04953.x

Cell-specific inhibitory and stimulatory effects of Fos and Jun on transcription activation by nuclear receptors.

L Shemshedini 1, R Knauthe 1, P Sassone-Corsi 1, A Pornon 1, H Gronemeyer 1
PMCID: PMC453121  PMID: 1935903

Abstract

We investigated the effect of c-Fos and/or c-Jun co-expression on transcription activation by the progesterone (PR), glucocorticoid (GR) or androgen (AR) receptors using three different reporter genes and four different cell lines. We found that c-Fos could only inhibit, while c-Jun could either inhibit or further stimulate receptor-induced transcription. All these effects were receptor, promoter, and cell type specific, and, importantly, the steroid receptors had non-reciprocal effects on the transactivation ability of c-Jun in the presence or absence of c-Fos. Collectively, these results argue against heterodimer formation as a mechanism to explain the phenomena. Transactivation by the endogenous PR in T47D cells could be inhibited by increasing the intracellular c-Fos level with forskolin as well as by co-expressing c-Fos; no such effect was seen in MCF-7 cells. The inhibition by c-Fos of PR-induced transcription involves a competitive mechanism, which requires the presence of the intact c-Fos leucine zipper and is directed mainly at the transcription activation function (TAF) located in the PR and GR hormone binding domains (TAF-2). However, the co-expression of c-Fos did not alter the 'squelching/transcriptional interference' by the PR of estrogen receptor (ER)-induced transcription. Multiple mechanisms are discussed which may be involved in the crosstalk between the two signal transduction pathways.

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