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. 1997 Dec;151(6):1655–1661.

Organ-site dependence for the production of urokinase-type plasminogen activator and metastasis by human renal cell carcinoma cells.

K Gohji 1, M Nakajima 1, D Boyd 1, C P Dinney 1, C D Bucana 1, S Kitazana 1, S Kamidono 1, I J Fidler 1
PMCID: PMC1858342  PMID: 9403716

Abstract

We examined the role of urokinase-type plasminogen activator (u-PA) in the metastasis of the human renal cell carcinoma (HRCC) implanted in athymic nude mice. Cells from a HRCC KG-2 line were implanted in orthotopic (kidney) and ectopic (subcutaneous) organs. The KG-2 cells implanted in the kidney produced local tumors and lung metastases, whereas those implanted subcutaneously produced only local tumors. The production of u-PA was determined by immunohistochemistry and an enzyme-linked immunosorbent assay (ELISA). High levels of u-PA were produced by the metastatic kidney tumors and lung metastases, whereas the subcutaneous tumors produced low levels. KG-2 cells co-cultured with mouse kidney or lung fibroblasts produced higher levels of u-PA than KG-2 cells co-cultured with mouse skin fibroblasts. Furthermore, KG-2 cells cultured with the conditioned medium from mouse kidney or lung fibroblasts produced higher levels of u-PA than KG-2 cells cultured with the conditioned medium from mouse skin fibroblasts. The results indicate that the expression of u-PA by KG-2 cells is one of the important factors that determine their metastatic potential and that the production of u-PA is influenced by the organ microenvironment, including soluble factors produced by surrounding fibroblasts.

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Selected References

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