Abstract
Thrombin signaling in endothelial cells provides an important link between coagulation and inflammation. We report here that thrombin induces endogenous Egr-1 mRNA and Egr-1 promoter activity in primary human endothelial cells by approximately 6-fold and 3-fold, respectively. In transient transfection assays, deletion of the 3′ cluster of serum response elements (SREs), but not the 5′ cluster of SREs, resulted in a loss of thrombin response. When coupled to a heterologous core promoter, a region spanning the 3′ SRE cluster contained information for thrombin response, whereas a region spanning the 5′ SRE cluster had no such effect. A point mutation of the most proximal SRE (SRE-1), but not of the proximal Ets motif or upstream SREs, abrogated the response to thrombin. In electrophoretic mobility shift assays, nuclear extracts from thrombin-treated cells displayed increased binding of total and phosphorylated serum response factor (SRF) to SRE-1. Thrombin-mediated induction of Egr-1 was blocked by inhibitors of MEK1/2, but not by inhibitors of protein kinase C, phosphatidylinositol 3-kinase, or p38 mitogen-activated protein kinase (MAPK). Taken together, these data suggest that thrombin induces Egr-1 expression in endothelial cells by a MAPK-dependent mechanism that involves an interaction between SRF and SRE-1.
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Dates
Type | When |
---|---|
Created | 22 years, 9 months ago (Nov. 26, 2002, 1:42 p.m.) |
Deposited | 2 years, 4 months ago (April 25, 2023, 9:53 a.m.) |
Indexed | 1 month, 3 weeks ago (July 14, 2025, 11:36 p.m.) |
Issued | 22 years, 8 months ago (Dec. 15, 2002) |
Published | 22 years, 8 months ago (Dec. 15, 2002) |
Published Print | 22 years, 8 months ago (Dec. 15, 2002) |
@article{Wu_2002, title={The proximal serum response element in the Egr-1 promoter mediates response to thrombin in primary human endothelial cells}, volume={100}, ISSN={0006-4971}, url={http://dx.doi.org/10.1182/blood-2002-02-0415}, DOI={10.1182/blood-2002-02-0415}, number={13}, journal={Blood}, publisher={American Society of Hematology}, author={Wu, Sheng-Qian and Minami, Takashi and Donovan, Diana J. and Aird, William C.}, year={2002}, month=dec, pages={4454–4461} }