PMID: 9933644Feb 6, 1999

The transcription factor EGR-1 suppresses transformation of human fibrosarcoma HT1080 cells by coordinated induction of transforming growth factor-beta1, fibronectin, and plasminogen activator inhibitor-1

The Journal of Biological Chemistry
C LiuDan Mercola

Abstract

Re-expression of EGR-1 in fibrosarcoma HT1080 suppresses transformation including tumorigenicity (Huang, R.-P., Liu, C., Fan, Y., Mercola, D., and Adamson, E. (1995) Cancer Res. 55, 5054-5062) owing in part to up-regulation of the transforming growth factor (TGF)-beta1 promoter by EGR-1 which suppresses growth by an autocrine mechanism (Liu, C., Adamson, E., and Mercola, D. (1996) Proc. Natl. Acad. Sci. U. S. A. 93, 11831-11836). Here we show that enhanced cell attachment contributes to the suppression via increased secretion of fibronectin (FN) and also of plasminogen activator inhibitor-1 (PAI-1). The secretion of FN and PAI-1 is strongly correlated with EGR-1 expression (RPEARSON = 0.971 and 0. 985, respectively). Addition of authentic TGF-beta1 to parental cells greatly stimulated secretion of PAI-1 but not FN, whereas addition of TGF-beta antibody or lipofection with specific antisense TGF-beta1 oligonucleotides to EGR-1-regulated cells completely inhibits the secretion of PAI-1 but not FN. However, in gel mobility shift assays pure EGR-1 or nuclear extracts of EGR-1-regulated cells specifically bind to two GC-rich elements of the human FN promoter at positions -75/-52 and -4/+18, indicating that the increased secretion of...Continue Reading

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Zinc Fingers
Gene Expression Regulation, Neoplastic
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