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Thromb Haemost 2015; 114(02): 337-349
DOI: 10.1160/TH14-08-0653
Blood Cells, Inflammation and Infection
Schattauer GmbH

Pro-inflammatory cytokines reduce human TAFI expression via tristetraprolin-mediated mRNA destabilisation and decreased binding of HuR

Dragana Komnenov
1   Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada
,
Corey A. Scipione
1   Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada
,
Zainab A. Bazzi
1   Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada
,
Justin J.W. Garabon
1   Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada
,
Marlys L. Koschinsky
1   Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada
,
Michael B. Boffa
1   Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada
› Author Affiliations
Further Information

Publication History

Received: 04 August 2014

Accepted after major revision: 12 March 2015

Publication Date:
29 November 2017 (online)

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Summary

Thrombin activatable fibrinolysis inhibitor (TAFI) is the zymogen form of a basic carboxypeptidase (TAFIa) with both anti-fibrinolytic and anti-inflammatory properties. The role of TAFI in inflammatory disease is multifaceted and involves modulation both of specific inflammatory mediators as well as of the behaviour of inflammatory cells. Moreover, as suggested by in vitro studies, inflammatory mediators are capable of regulating the expression of CPB2, the gene encoding TAFI. In this study we addressed the hypothesis that decreased TAFI levels observed in inflammation are due to post-transcriptional mechanisms. Treatment of human HepG2 cells with pro-inflammatory cytokines TNFα, IL-6 in combination with IL-1β, or with bacterial lipopolysaccharide (LPS) decreased TAFI protein levels by approximately two-fold over 24 to 48 hours of treatment. Conversely, treatment of HepG2 cells with the anti-inflammatory cytokine IL-10 increased TAFI protein levels by two-fold at both time points. We found that the mechanistic basis for this modulation of TAFI levels involves binding of tristetraprolin (TTP) to the CPB2 3′-UTR, which mediates CPB2 mRNA destabilisation. In this report we also identified that HuR, another ARE-binding protein but one that stabilises transcripts, is capable of binding the CBP2 3’UTR. We found that pro-inflammatory mediators reduce the occupancy of HuR on the CPB2 3’-UTR and that the mutation of the TTP binding site in this context abolishes this effect, although TTP and HuR appear to contact discrete binding sites. Interestingly, all of the mediators tested appear to increase TAFI protein expression in THP-1 macrophages, likewise through effects on CPB2 mRNA stability.

Keywords

Fibrinolysis inhibitors - inflammatory mediators - gene regulation - liver
 

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