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FEBS Lett. 2007 Jun 26;581(16):3098-104. Epub 2007 May 29.

PAI-1 deficiency reduces liver fibrosis after bile duct ligation in mice through activation of tPA.

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  • 1Division of Gastroenterology and Nutrition, Department of Pediatrics, Washington University School of Medicine, St. Louis, MO 63110, USA.

Abstract

Plasminogen activator inhibitor-1 (PAI-1) increases injury in several liver, lung and kidney disease models. The objective of this investigation was to assess the effect of PAI-1 deficiency on cholestatic liver fibrosis and determine PAI-1 influenced fibrogenic mechanisms. We found that PAI-1(-/-) mice had less fibrosis than wild type (WT) mice after bile duct ligation. This change correlated with increased tissue-type plasminogen activator (tPA) activity, and increased matrix metalloproteinase-9 (MMP-9), but not MMP-2 activity. Furthermore, there was increased activation of the tPA substrate hepatocyte growth factor (HGF), a known anti-fibrogenic protein. In contrast, there was no difference in hepatic urokinase plasminogen activator (uPA) or plasmin activities between PAI-1(-/-) and WT mice. There was also no difference in the level of transforming growth factor beta 1 (TGF-beta1), stellate cell activation or collagen production between WT and PAI-1(-/-) animals. In conclusion, PAI-1 deficiency reduces hepatic fibrosis after bile duct obstruction mainly through the activation of tPA and HGF.

PMID:
17561000
[PubMed - indexed for MEDLINE]
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