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Am J Physiol Heart Circ Physiol 279: H2865-H2871, 2000;
0363-6135/00 $5.00
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Vol. 279, Issue 6, H2865-H2871, December 2000

Hepatocyte growth factor is upregulated by low-density lipoproteins and inhibits endothelin-1 release

Cornelia Haug1, Alexandra Schmid-Kotsas1, Ulrike Zorn1, Max G. Bachem1, Sabine Schuett1, Adolf Gruenert1, and Eva Rozdzinski2

1 Institute of Clinical Chemistry and 2 Department of Microbiology, University Hospital Ulm, D-89070 Ulm, Germany

Low-density lipoproteins (LDL) are known to cause endothelial injury and to promote the development of atherosclerotic lesions. This study demonstrates a significant concentration-dependent stimulatory effect of LDL on hepatocyte growth factor (HGF) synthesis (maximum release: 423 ± 16% of control) and HGF receptor mRNA expression in cultured human coronary artery endothelial cells (HCAEC). HGF is a potent mitogen for endothelial cells but does not affect smooth muscle cell proliferation. In contrast, endothelin-1 (ET-1) acts as a mitogen on vascular smooth muscle cells and seems to be upregulated in coronary atherosclerosis. In this study, the basal ET-1 synthesis in HCAEC was concentration-dependently reduced by HGF (minimum: 54 ± 3% of control). This inhibitory effect seems to be mediated via the tyrosine kinase activity of the HGF receptor c-met, since it was antagonized by the tyrosine kinase inhibitor lavendustin A. In addition, HGF also significantly reduced the LDL-stimulated ET-1 release. The LDL-induced upregulation of HGF synthesis in HCAEC and the inhibitory effect of HGF on ET-1 synthesis suggest a protective role of HGF in coronary atherosclerosis.

endothelin; endothelial cells


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