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Mol. Cell. Biol., Mar 1996, 1115-1125, Vol 16, No. 3
M Jeffers, S Rong and GF Vande Woude
Hepatocyte growth factor/scatter factor (HGF/SF) is a pleiotropic effector
of cells expressing the Met tyrosine kinase receptor. Although HGF/SF is
synthesized by mesenchymal cells and acts predominantly on epithelial
cells, we have recently demonstrated that human sarcoma cell lines often
inappropriately express high levels of Met and respond mitogenically to
HGF/SF. In the present report we show that HGF/SF-Met signalling in the
human leiomyosarcoma cell line SK-LMS-1 enhances its in vivo
tumorigenicity, an effect for which the mitogenicity of this signalling
pathway is likely to play a role. In addition, we found that HGF/SF-Met
signalling dramatically induces the in vitro invasiveness and in vivo
metastatic potential of these cells. We have studied the molecular basis by
which HGFSF-Met signalling mediates the invasive phenotype. A strong
correlation has previously been demonstrated between the activation of the
urokinase plasminogen activator (uPA) proteolysis network and the
acquisition of the invasive-metastatic phenotype, and we show here that
HGF/SF-Met signalling significantly increases the protein levels of both
uPA and its cellular receptor in SK-LMS-1 cells. This results in elevated
levels of cell-associated uPA and enhanced plasmin-generating ability by
these cells. These studies couple HGF/SF-Met signalling to the activation
of proteases that mediate dissolution of the extracellular matrix-basement
membrane, and important property for cellular invasion-metastasis.
Copyright © 1996, American Society for Microbiology
Enhanced tumorigenicity and invasion-metastasis by hepatocyte growth factor/scatter factor-met signalling in human cells concomitant with induction of the urokinase proteolysis network
ABL-Basic Research Program, NCI-Frederick Cancer Research and Development Center, Maryland 21702, USA.
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