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ABL-Basic Research Program, National Cancer Institute, Frederick Cancer Research and Development Center, Frederick, Maryland 21702
The met protooncogene tyrosine kinase receptor (Met) and its ligand, hepatocyte growth factor/scatter factor (HGF/SF), ordinarily constitute a paracrine signaling system in which cells of mesenchymal origin produce the lignad, which binds to the receptor that is predominantly expressed in cells of epithelial origin. However, mouse NIH/3T3 fibroblasts overexpressing Met induce tumor formation in nude mice via an autocrine mechanism (S. Rong et al., Mol. Cell. Biol., 12: 51525158, 1992). In this study, we report that human cell lines established from various sarcomas express high levels of activated Met receptor. HGF/SF is also detected in the human sarcoma cell lines but at a reduced level when compared to primary fibroblasts. These properties, high Met expression and reduced ligand levels, are indistinguishable from the properties of NIH/3T3 tumor explant cells overexpressing Met (S. Rong et al., Mol. Cell. Biol., 12: 51525158, 1992; S. Rong et al., Cell Growth & Differ., 4: 563569, 1993). Moreover, paraffin-embedded sections of primary tumors from human osteosarcomas, chondrosarcomas, and leiomyosarcoma stain intensely for Met and/or HGF/SF and display extensive tumor cell heterogeneity with regard to both paracrine and autocrine stimulation. On the basis of these findings, we propose that Met-HGF/SF autocrine signaling may contribute to the tumorigenic process in human sarcomas.
1 Research sponsored by the National Cancer Institute, DHHS, under contract NO1-CO-74101 with ABL. The contents of this publication do not necessarily reflect the views or policies of the Department of Health and Human Services, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.
2 To whom requests for reprints should be addressed.
Received 10/ 5/93. Accepted 10/11/93.
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