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DOI: 10.1160/TH03-06-0358
Expression of tissue factor pathway inhibitor-2 in murine and human liver regulation during inflammation
Financial support: This work was supported by grants from Comité de la Dordogne from the Ligue Nationale Contre le Cancer, Association pour la Recherche sur la Cancer, and Conseil Régional d’Aquitaine. WK was supported by a grant (HL-64119) from the National Institutes of Health.Publication History
Received
12 June 2003
Accepted after resubmission
23 February 2003
Publication Date:
05 December 2017 (online)
Summary
Tissue factor pathway inhibitor-2 (TFPI-2) is a recently described serine proteinase inhibitor. Human and murine TFPI-2 share about 50% homology. The aim of this study was to investigate the cellular localization of human and murine TFPI-2 in the liver and the regulation of their expression during acute inflammation. Northern blot, in situ hybridization and studies on isolated hepatocytes demonstrated a high-level expression of TFPI-2 in murine hepatocytes. On the other hand, very little TFPI-2 mRNA expression could be detected in human liver. Studies with isolated human liver cells suggested that TFPI-2 expression in human liver was mainly observed in liver sinusoidal endothelial cells rather than hepatocytes. Liver murine TFPI-2 expression was greatly increased after lipopolysaccharide administration with a delayed kinetics as compared to α1-acid glycoprotein, a classical acute-phase reactant. Accordingly, studies with isolated cells showed that the increase in TFPI-2 transcripts occurred in non-hepatocytic cells. Moreover, the LPS response was abolished in mice with a hepatocyte-specific KO for the gp130 receptor, thus indicating that a mediator from hepatocytes is involved in the up-regulation of TFPI-2 in non-parenchymal cells. In conclusion, murine TFPI-2 is highly expressed in hepatocytes in the normal murine liver and is upregulated in non-parenchymal cells in the context of inflammation. The large difference in the level of liver expression of human and murine TFPI-2 suggests that despite significant sequence similarities, these proteins presumably have different functions in the two species.
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