Zusammenfassung
Extravasation und Intravasation von Tumorzellen in soliden malignen Tumoren erfolgt in 3 verschiedenen Schritten:
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Anheftung an und Interaktion von Tumorzellen mit Komponenten der Basalmembran und der extrazellulären Matrix,
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lokale Proteolyse und
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Tumorzellmigration.
Verschiedene Klassen von Proteasen, deren Inhibitoren und Rezeptoren sind an Tumorinvasion und Metastasierung beteiligt. Es sind dies:
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Matrixmetalloproteasen; zu denen zählen die Kollagenasen, Gelatinasen und Stromelysine.
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Cysteinproteasen; z.B. Cathepsine B und L.
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Aspartylprotease Cathepsin D.
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Serinproteasen; dazu zählen Plasmin, Gewebetyp-Plasminogenaktivator (tPA) und der Urokinasetyp-Plasminogenaktivator (uPA).
Die klinische Relevanz von Proteasen wurde in den letzten Jahren besonders für uPA und seinen Inhibitor PAI-1 gezeigt. uPA und PAI-1 sind starke, unabhängige prognostische Faktoren für die Rezidivhäufigkeit und/oder die Überlebenswahrscheinlichkeit bei Patientinnen mit Brustkrebs, Eierstockkrebs, Lungenkrebs, Nierenkrebs und malignen Erkrankungen des Gastrointestinaltrakts (Magen, Kolon, Ösophagus). Die starke Korrelation zwischen erhöhten uPA- und/oder PAI-1-Werten in Primärtumorgeweben und des malignen Phänotyps von Tumorzellen führte zur Entwicklung neuer, an der Tumorbiologie orientierten Konzepten, mit dem Ziel, die Expression des uPA oder des uPA-Rezeptors (CD 87) zu unterdrücken bzw. die Interaktion von uPA mit dem uPA-Rezeptor zu verhindern. Zu diesen Konzepten zählen gegen uPA oder uPAR gerichtete Antisense-Oligonukleotide und Antikörper, gegen das enzymatische Zentrum von uPA gerichtete Inhibitoren und rekombinante oder synthetische uPA und CD 87-Analoga.
Danksagungen. Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft (Klinische Forschergruppe GR280/4−1 und GR280/4−2) unterstützt. Die Autoren danken Dr. R. Hart, American Diagnostica, Greenwich, CT, USA, herzlich für die großzügige materielle Unterstützung.
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Schmitt, M. et al. (1996). Urokinasetyp-Plasminogenaktivator (uPA), sein Inhibitor PAI-1 und sein Rezeptor (CD87) sind an Tumorinvasion und Metastasierung solider maligner Tumoren beteiligt. In: Spanuth, E. (eds) Malignome und Hämostase. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-79744-6_16
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