In the present study the concept of prophylactic overexpression of natural inhibitors of tumor-associated proteases (matrix metalloproteinases, plasminogen activators, cysteine proteases) by the host tissue to prevent experimental metastasis of a human fibrosarcoma cell line was investigated. Therefore, adenoviral vectors encoding for natural protease inhibitors (tissue inhibitor of metalloproteinases-1 (TIMP-1), plasminogen activator inhibitor-2 (PAI-2), and cystatin C, respectively) were constructed. Overexpression of these inhibitors significantly reduced the number of lung-metastases as compared to the control (by 93, 52, and 92%, respectively). A significant additive anti-metastatic effect was achieved by simultaneous inhibition of two proteolytic systems by TIMP-1 and PAI-2 (99% reduction). These results support the concept of prophylactic overexpression of natural protease inhibitors to prevent metastasis and demonstrate optimization of this concept by simultaneous inhibition of two or more tumor associated proteolytic systems.
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In the present study the concept of prophylactic overexpression of natural inhibitors of tumor-associated proteases (matrix metalloproteinases, plasminogen activators, cysteine proteases) by the host tissue to prevent experimental metastasis of a human fibrosarcoma cell line was investigated. Therefore, adenoviral vectors encoding for natural protease inhibitors (tissue inhibitor of metalloproteinases-1 (TIMP-1), plasminogen activator inhibitor-2 (PAI-2), and cystatin C, respectively) were const...
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