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Thromb Haemost 1989; 62(02): 723-728
DOI: 10.1055/s-0038-1646891
Original Article
Schattauer GmbH Stuttgart

Plasminogen Activator Inhibitor 1: Biosynthesis and mRNA Level Are Increased by Insulin in Cultured Human Hepatocytes

T Kooistra
The Gaubius Institute TNO, Leiden, The Netherlands
,
P J Bosma
The Gaubius Institute TNO, Leiden, The Netherlands
,
H A M Töns
The Gaubius Institute TNO, Leiden, The Netherlands
,
A P van den Berg
The Gaubius Institute TNO, Leiden, The Netherlands
,
P Meyer
The Gaubius Institute TNO, Leiden, The Netherlands
,
H M G Princen
The Gaubius Institute TNO, Leiden, The Netherlands
› Author Affiliations
Further Information

Publication History

Received 07 March 1989

Accepted after revision 17 April 1989

Publication Date:
30 June 2018 (online)

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Summary

Clinical studies have shown that plasma insulin levels are closely related to plasma plasminogen activator inhibitor 1 (PAI-1) levels. To investigate a possible involvement of hepatocytes we have studied the effect of insulin on PAI-1 production by primary cultures of human hepatocytes. We have isolated human hepatocytes from seven left liver lobes. PAI-1 activity measured in 24 hours conditioned medium varied considerably between the various hepatocyte preparations (from 2.9 to 8.5 units per 5 cm2of cells) possibly as a result of interindividual variability in basal PAI-1 production by hepatocytes from different donors. In all cases, however, the relative extent, time profile and dose-dependency of the insulin-induced increase in PAI-1 synthesis were consistent. Up to about 7 nM, insulin dose-dependently increased both PAI-1 activity and PAI-1 antigen production. The increase in PAI-1 synthesis became measurable between 4 and 8 hours after addition of the hormone, and maximally reached twofold control values. The increase in PAI-1 synthesis could be fully explained by a concomitant increase in PAI-1 mRNA levels. The effect of insulin seems fairly specific for the synthesis of PAI-1: overall protein synthesis and mRNA levels of some control proteins (albumin and fibrinogen) did not markedly change after insulin addition. These results, obtained with primary cultures of human hepatocytes, are fully comparable with those obtained with the hepatocellular carcinoma cell line Hep G2. They strengthen the suggestion that the elevated level of PAI-1 in high insulin plasma might be the result of increased hepatic synthesis of PAI-1.

Keywords

Insulin - Plasminogen activator inhibitor 1 - Human hepatocytes - Hep G2
 

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