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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Crowley, C. W. Cohen, R. L. Liu, G. Lucas, B. K. Levinson, A. D. Shuman, M. A. |
| Description | Author Affiliation: Crowley CW ( Department of Cell Genetics, Genentech, Inc., South San Francisco, CA 94080.); |
| Abstract | The plasminogen activator urokinase (u-PA) mediates proteolysis by a variety of human tumor cells. Competitive displacement of u-PA from cellular binding sites results in decreased proteolysis in vitro, suggesting that the cell surface is the preferred site for u-PA-mediated protein degradation. We studied the effect of u-PA receptor blockade on the metastatic capacity of human PC3 prostate carcinoma cells, using transfectants which expressed chloramphenicol acetyl-transferase (CAT). Eight weeks after subcutaneous inoculation of these cells into nude mice, CAT activity was detected in regional lymph nodes, femurs, lungs, and brain, thereby mimicking the organ tropism observed for naturally occurring metastases of prostate cancer. In a second transfection, CAT-expressing PC3 cells received cDNA encoding a mutant u-PA (Ser356-->Ala) which lacks enzymatic activity but which retains full receptor binding affinity. Three mutant u-PA expressors, each with < 5% of wild-type cell-associated u-PA activity, were compared in vivo with independently derived controls. Primary tumor growth was similar in each group of animals and all tumors expressed comparable CAT activity. In contrast, metastasis (as assessed by CAT activity) was markedly inhibited when cell surface u-PA activity was blocked. Levels of CAT activity were reduced by a factor of > 300 in regional lymph nodes, 40-100 in brain tissue, and 10-20 in lung tissue. Metastatic capacity was inhibited similarly when animals were given intermittent intraperitoneal injections of a u-PA/IgG fusion protein capable of displacing u-PA activity from the tumor cell surface. Our results indicate that cell surface u-PA activity is essential to the metastatic process. In addition, the assay system employed in these experiments may be generally useful in testing other therapeutic modalities to limit the spread of primary tumors. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 11 |
| Volume Number | 90 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1993-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Adenocarcinoma Pathology Neoplasm Metastasis Prostatic Neoplasms Receptors, Cell Surface Antagonists & Inhibitors Urokinase-Type Plasminogen Activator Metabolism Amino Acid Sequence Animals Brain Enzymology Brain Neoplasms Cell Line Chloramphenicol O-Acetyltransferase Genetics Immunoglobulin G Biosynthesis Lung Lung Neoplasms Lymph Nodes Lymphatic Metastasis Mice Mice, Nude Mutagenesis, Site-Directed Neoplasm Invasiveness Neoplasm Transplantation Receptors, Urokinase Plasminogen Activator Recombinant Fusion Proteins Transfection Transplantation, Heterologous Tumor Cells, Cultured Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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