The serine protease urokinase-type plasminogen activator (uPA) when bound to its specific receptor, uPAR plays a significant role in tumor cell invasion and metastasis. In an in vivo nude mouse model, we tested tumor growth and metastasis of the human breast cancer cell line MDA-MB-231 BAG, which has been transfected with an expression plasmid encoding a soluble form of uPAR (suPAR). We explored, whether suPAR/uPA interaction reduces the binding of uPA to cell surface-associated uPAR and, as a consequence, could suppress tumor growth and metastasis of the human breast cancer cell line. Overexpressed, secreted suPAR was shown to bind and thus scavenge the uPA secreted by the cell line. In addition, we did a batimastat therapy intraperitoneal. We could show for the first time, that the overexpression of suPAR leads to a significant reduction of tumor growth and metastasis. The inhibitory effect of Batimastat was very low, but resulted in the occurence of liver-metastasis.
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The serine protease urokinase-type plasminogen activator (uPA) when bound to its specific receptor, uPAR plays a significant role in tumor cell invasion and metastasis. In an in vivo nude mouse model, we tested tumor growth and metastasis of the human breast cancer cell line MDA-MB-231 BAG, which has been transfected with an expression plasmid encoding a soluble form of uPAR (suPAR). We explored, whether suPAR/uPA interaction reduces the binding of uPA to cell surface-associated uPAR and, as a c...
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