Abstract
The met protooncogene product, Met, is the tyrosine kinase growth factor receptor for hepatocyte growth factor/scatter factor (HGF/SF). NIH 3T3 cells express HGF/SF endogenously and become tumorigenic in nude mice via an autocrine mechanism when murine Met is expressed ectopically (Metmu cells) or when human Met and human HGF/SF are coexpressed (HMH cells). Here, we show that Metmu and HMH cells are invasive in vitro and display enhanced protease activity necessary for the invasive phenotype. In experimental and spontaneous metastasis assays, Metmu or HMH cells metastasize to the lung, but lower numbers of subcutaneously injected Metmu and HMH cells produced invasive tumors in the heart, diaphragm, salivary gland, and retroperitoneum. It has been reported elsewhere that Met expression increased with tumor passage in athymic nude mice, and these tumor explants show enhanced activity in the metastasis assays. Autocrine-mediated Met-HGF/SF signal transduction in NIH 3T3 mesenchymal cells may provide an important system for understanding the biological process of metastasis.
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Selected References
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