Abstract
Several studies have established a link between blood coagulation and cancer, and more specifically between tissue factor (TF), a transmembrane protein involved in initiating blood coagulation, and tumor metastasis. In the study reported here, a murine model of human melanoma metastasis was used for two experiments. (i) The first experiment was designed to test the effect of varying the level of TF expression in human melanoma cells on their metastatic potential. Two matched sets of cloned human melanoma lines, one expressing a high level and the other a low level of the normal human TF molecule, were generated by retroviral-mediated transfections of a nonmetastatic parental line. The metastatic potential of the two sets of transfected lines was compared by injecting the tumor cells into the tail vein of severe combined immunodeficiency (SCID) mice and later examining the lungs and other tissues for tumor development. Metastatic tumors were detected in 86% of the mice injected with the high-TF lines and in 5% of the mice injected with the low-TF lines, indicating that a high TF level promotes metastasis of human melanoma in the SCID mouse model. This TF effect on metastasis occurs with i.v.-injected melanoma cells but does not occur with primary tumors formed from s.c.-injected melanoma cells, suggesting that TF acts at a late stage of metastasis, after tumor cells have escaped from the primary site and entered the blood. (ii) The second experiment was designed to analyze the mechanism by which TF promotes melanoma metastasis. The procedure involved testing the effect on metastasis of mutations in either the extracellular or cytoplasmic domains of the transmembrane TF molecule. The extracellular mutations introduced two amino acid substitutions that inhibited initiation by TF of the blood-coagulation cascade; the cytoplasmic mutation deleted most of the cytoplasmic domain without impairing the coagulation function of TF. Several human melanoma lines expressing high levels of either of the two mutant TF molecules were generated by retroviral-mediated transfection of the corresponding TF cDNA into the nonmetastatic parental melanoma line, and the metastatic potential of each transfected line was tested in the SCID mouse model. Metastases occurred in most mice injected with the melanoma lines expressing the extracellular TF mutant but were not detected in most mice injected with the melanoma lines expressing the cytoplasmic TF mutant. Results with the extracellular TF mutant indicate that the metastatic effect of TF in the SCID mouse model does not involve products of the coagulation cascade. Results with the cytoplasmic TF mutant indicate that the cytoplasmic domain of TF is important for the metastatic effect, suggesting that the TF could transduce a melanoma cell signal that promotes metastasis.
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