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c-Jun and the dominant-negative mutant, TAM67, induce vimentin gene expression by interacting with the activator Sp1

Oncogene volume 22, pages 8891–8901 (2003)Cite this article

Abstract

Vimentin exhibits a complex pattern of developmental- and tissue-specific expression. Since it is aberrantly expressed in metastatic tumors, which have progressed through the epithelial–mesenchymal transition, it has been cited as a marker for tumor progression. Previous studies have indicated that the transcription factor activator protein (AP1) is important in tumor progression. The stable transformation of the MCF7 cell line with the oncogene c-Jun resulted in a cell line (MCF7Jun), which displayed a change in morphology, enhanced migratory and invasive properties, and metastatic behavior. Of the 21 genes whose expression levels were altered in the MCF7Jun cell line, the greatest change in expression occurred for the vimentin gene. Previously, tandem AP1 sites in the promoter were reported to be important for the serum and TPA inducibility of the vimentin gene. However, we find that the AP1 elements only contribute in part to c-Jun activation. Moreover, this activation can be duplicated in COS-1 or S2 cells by expression of c-Jun or TAM67, and is dependent only on the leucine-zipper region of c-Jun. Transient transfection analyses, electrophoretic mobility shift assays, DNA precipitation assays, and coimmunoprecipitation studies suggest that c-Jun is able to synergize with the activator protein Sp1 in binding to GC-box1 to enhance vimentin gene expression.

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Acknowledgements

We thank Ms Yonghe Li for expert technical assistance. This work was supported by NHLBI, National Institutes of Health (NIH) Grant HL-45422 to ZEZ.

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  1. Department of Biochemistry and the Massey Cancer Center, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, 23298-0614, VA, USA

    Yongzhong Wu, Xueping Zhang & Zendra E Zehner

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  1. Yongzhong Wu
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Correspondence to Zendra E Zehner.

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Wu, Y., Zhang, X. & Zehner, Z. c-Jun and the dominant-negative mutant, TAM67, induce vimentin gene expression by interacting with the activator Sp1. Oncogene 22, 8891–8901 (2003). https://doi.org/10.1038/sj.onc.1206898

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