Abstract
Endothelin-1 (ET-1) is a 21-amino-acid vasoactive peptide initially characterized as a product of endothelial cells. Reporter gene transfection experiments have indicated that a GATA site and an AP1 site are essential for ET-1 promoter function in endothelial cells, and GATA-2 appears to be the active GATA factor which regulates ET-1 expression. To look for interactions between AP1 and GATA-2, transactivation experiments were performed with expression vectors encoding c-Jun, c-Fos, and GATA-2. Cooperativity between the AP1 complex and GATA-2 was observed as a synergistic increase in transcriptional activity of the ET-1 reporter plasmid. In addition, AP1 was able to potentiate the action of GATA-2 on reporter constructs lacking a functional AP1 site. In a similar fashion, GATA-2 was able to potentiate the action of AP1 despite deletion of the GATA site. Experiments with GATA-1 and GATA-3 expression vectors provided evidence that this capacity to interact with AP1 may be a characteristic of all GATA family members. Biochemical evidence for AP1-GATA interaction was provided by immunoprecipitation experiments. A GATA-2-specific antiserum was shown to immunoprecipitate in vitro-synthesized Jun and Fos protein from reticulocyte lysate. Also, antisera directed against Jun and Fos were able to immunoprecipitate from nuclear extracts a GATA-binding protein, indicating the association of AP1 and GATA proteins in vivo.
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