| First Author | Fearns C | Year | 1997 |
| Journal | Am J Pathol | Volume | 150 |
| Issue | 2 | Pages | 579-90 |
| PubMed ID | 9033272 | Mgi Jnum | J:38287 |
| Mgi Id | MGI:85664 | Citation | Fearns C, et al. (1997) Induction of plasminogen activator inhibitor 1 gene expression in murine liver by lipopolysaccharide. Cellular localization and role of endogenous tumor necrosis factor-alpha. Am J Pathol 150(2):579-90 |
| abstractText | We previously demonstrated that lipopolysaccharide (LPS) induces plasminogen activator inhibitor 1 (PAI-1) gene expression primarily in endothelial cells in most organs of the mouse, with maximal induction by 3 hours. Here we show that induction in the liver occurs in a distinctly different pattern. For example, the increase in PAI-1 mRNA in liver was biphasic with an initial peak at 1 to 2 hours and a second peak at 6 to 8 hours. Moreover, in situ hybridization experiments revealed that PAI-1 mRNA was induced in both endothelial cells and hepatocytes. The endothelial cell response was monophasic and maximal between 1 and 4 hours, whereas the hepatocyte response was biphasic, peaking at 2 hours and again at 6 to 8 hours. To determine possible mechanisms involved in the induction of PAI-1 by LPS, we analyzed the tissues for changes in tumor necrosis factor (TNF)-alpha LPS caused a rapid induction of TNF-alpha mRNA in Kupffer cells, detectable within 15 minutes. Pretreatment of mice with anti-TNF antiserum before challenge with LPS reduced the subsequent increase in plasma levels of PAI-1 by 50 to 70% and significantly reduced the level of induction of PAI-1 mRNA in the liver at both early and late times. Pretreatment appeared to inhibit induction primarily within hepatocytes. These results suggest that LPS may induce PAI-1 in endothelial cells and hepatocytes by different mechanisms. |
