Published online before print February 2, 2006, doi: 10.1161/01.RES.0000207407.51752.3c
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Submitted on August 22, 2005
Revised on December 22, 2005
Accepted on January 16, 2006
Foxc2 Is a Common Mediator of Insulin and Transforming Growth Factor 
Signaling to Regulate Plasminogen Activator Inhibitor Type I Gene Expression
Hideo Fujita ;
From the Division of Cardiovascular Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tenn.
* To whom correspondence should be addressed. E-mail: tsutomu.kume{at}vanderbilt.edu.
Elevated plasma levels of plasminogen activator inhibitor type I (PAI-1), a significant risk factor of ischemic heart disease, are associated with insulin resistance in which insulin and transforming growth factor (TGF)-
play a pivotal role in regulating PAI-1 production. Forkhead transcription factor FOXC2 is an important regulator of insulin resistance. However, the underlying molecular mechanisms to link FOXC2 to PAI-1 levels in insulin resistance remain to be elucidated. Here, we demonstrate that Foxc2 is a common transcriptional activator of insulin and TGF- signaling to directly regulate PAI-1 expression via 2 distinct target sites, an insulin response element (IRE) and a novel forkhead-binding element (FBE), adjacent to a Smad-binding site. We found that in adipocytes and endothelial cells Foxc2 mediates insulin action competing with another Forkhead protein, FOXO1, via the insulin response element, and simultaneously cooperate with the TGF-/Smad pathway to transactivate PAI-1. Importantly, Foxc2 haploinsufficiency in mice significantly attenuates TGF-1-induced PAI-1 expression in the cardiovascular system and adipose tissue. Taken together, we propose that Foxc2 is a key molecule to regulate PAI-1 gene expression.
Key words: plasminogen activator inhibitor-1 promoter • insulin response element • TGF-
•
response site •
forkhead transcription factor
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