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Thromb Haemost 2007; 98(02): 296-303
DOI: 10.1160/TH07-02-0140
Theme Issue Article
Schattauer GmbH

CREB binding to the hypoxia-inducible factor-1 responsive elements in the plasminogen activator inhibitor-1 promoter mediates the glucagon effect

Elitsa Y. Dimova
1   Department Chemistry/Biochemistry, University of Kaiserslautern, Kaiserslautern, Germany
,
Malgorzata M. Jakubowska
1   Department Chemistry/Biochemistry, University of Kaiserslautern, Kaiserslautern, Germany
,
Thomas Kietzmann
1   Department Chemistry/Biochemistry, University of Kaiserslautern, Kaiserslautern, Germany
› Author Affiliations Financial support: This study was supported by the grants from Fonds der Chemischen Industrie and Deutsche Krebshilfe 106929.
Further Information

Publication History

Received 23 February 2007

Accepted after revision 21 April 2007

Publication Date:
28 November 2017 (online)

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Summary

Plasminogen activator inhibitor-1 (PAI-1) controls the regulation of the fibrinolytic system in blood by inhibiting both urokinase-type and tissue-type plasminogen activators. Enhanced levels of PAI-1 are related to pathological conditions associated with hypoxia or hyperinsulinemia. In this study, we investigated the regulation of PAI-1 expression by glucagon and the cAMP/ PKA/CREB signalling pathway in the liver. Stimulation of the cAMP/PKA/CREB signalling cascade by starvation in vivo or glucagon in vitro induced PAI-1 gene expression in liver. Furthermore, this response was associated with enhanced phosphorylation of CREB. By using EMSAs we found that three promoter elements, the HRE2, E-box 4 and E-box 5, were able to bind CREB but only the HRE2 and E5 appeared to be functionally active. Reporter gene assays confirmed that cAMP induced PAI-1 gene transcription via the same element in both human and rat promoters. Interestingly, although the HRE2 was involved, the glucagon/cAMP pathway had no influence on hypoxia-inducible factor-1 (HIF-1) mRNA and protein levels. Thus, CREB binding to the HIF-1 responsive elements in PAI-1 promoter mediates the glucagon effect in the liver.

Keywords

PAI-1 - glucagon - cAMP - CREB - HIF-1
 

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