An 8.5-kb 5'-flanking region of the human urokinase-type plasminogen activator receptor (uPAR) gene was cloned and the detailed uPAR promoter region defined in an 188-bp fragment between bases -141 and +47 relative to the transcription-start site. 5;-Deletion to - 100 and -60 in the region abolished its promoter activity, indicating that an 81-bp segment between - 141 and -61, which contains a proximal AP-1 site at position -70, is required for uPAR promoter activity. Nuclear extracts from HCT116 cells contain proteins that specifically bind to the AP-1 site. Mutation of the AP-1 motif reduced uPAR promoter activity in comparison with the wild-types. Induction of uPAR expression by phorbol ester requires this AP-1 motif in colon cancer cells. Cotransfection with the c-jun and c-fos expression vectors stimulated the uPAR promoter activity four- to fivefold. These results demonstrate that the proximal AP-1 motif is responsible for ≃50% of the basal expression of the uPAR gene.
CITATION STYLE
Dang, J., Boyd, D., Wang, H., Allgayer, H., Doe, W. F., & Wang, Y. (1999). A region between -141 and -61 bp containing a proximal AP-1 is essential for constitutive expression of urokinase-type plasminogen activator receptor. European Journal of Biochemistry, 264(1), 92–99. https://doi.org/10.1046/j.1432-1327.1999.00583.x
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