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. 1990 Jul;9(7):2233–2239. doi: 10.1002/j.1460-2075.1990.tb07393.x

Nuclear factor I acts as a transcription factor on the MMTV promoter but competes with steroid hormone receptors for DNA binding.

U Brüggemeier 1, L Rogge 1, E L Winnacker 1, M Beato 1
PMCID: PMC551947  PMID: 2162764

Abstract

Several steroid hormones induce transcription of the mouse mammary tumor virus (MMTV) promoter, through an interaction of their respective receptors with the hormone responsive elements (HREs) in the long terminal repeat (LTR) region. The molecular mechanism underlying transcriptional activation is not known, but binding of nuclear factor I (NFI) to a site adjacent to the HRE appears to be required for efficient transcription of the MMTV promoter. In JEG-3 choriocarcinoma cells the MMTV promoter is transcribed inefficiently, even after transfection of the receptor cDNA and treatment with glucocorticoids or progestins. These cells contain low levels of NFI as cotransfection of NFI cDNA enhances MMTV transcription and this effect is inhibited by mutation of the NFI binding site. In DNA binding experiments with purified NFI from pig liver, the glucocorticoid and progesterone receptors do not co-operate but rather compete with NFI for binding to their respective sites on the LTR. Similar results are obtained with a functional recombinant NFI synthesized in vitro. Competition for DNA binding is probably due to steric hindrance as the DNase I footprints of the hormone receptors and NFI do overlap. These results suggest that, though NFI acts as a transcription factor on the MMTV promoter, transcriptional activation does not take place through a direct facilitation of DNA binding of NFI by steroid hormone receptors.

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