Zusammenfassung
Hintergrund
Invasion und metastatische Aussaat von Tumorzellen sind beim kolorektalen Karzinom prognoseentscheidend. Abelson interactor 1 (Abi1), ein 65-kD-Substrat der Abelson-Tyrosinkinase, interagiert mit der Phosphatidylinositol-3-Kinase (PI3K) sowie dem heterogenen nukleären Ribonukleoprotein K (hnRNP K) und ist ein essenzielles Regulatorprotein zytoskelettärer Umbauvorgänge bei der Reifung synaptischer Verbindungen im zentralen Nervensystem und bei der Migration von Tumorzellen.
Fragestellung
Zielsetzung der Arbeit war die Darstellung des Expressionsmusters und der Rolle von Abi1 bei der Reorganisation des Zellskeletts kolorektaler Karzinomzellen.
Material und Methoden
Zum Einsatz kamen Immunhistochemie; Immunfluoreszenzmikroskopie; liposomale Transfektion; Proteinanalytik (Western Blotting).
Ergebnisse
Abi1 wird an der Invasionsfront kolorektaler Karzinome exprimiert und lokalisiert entlang lamellipodienartiger Zellausläufer kultivierter kolorektaler Karzinomzellen. Hier ist auch eine phosphorylierte Abi-1-Isoform nachzuweisen, welche nach Behandlung mit dem Tyrosinkinaseinhibitor STI571 (Glivec®) verschwindet. RNAi-Knockdown von Abi1 sowie die Gabe von STI571 verändern die zelluläre Morphologie von lamelli- hin zu filopodienartigen Zellausläufern.
Diskussion
Unsere ersten Ergebnisse deuten darauf hin, dass phosphoryliertes Abi1 eine zentrale Rolle bei der Ausbildung lamellipodienartiger Zellfortsätze als Voraussetzung für die zelluläre Migration kolorektaler Karzinomzellen spielt. Da die Phosphorylierung von Abi1 durch Applikation des Tyrosinkinaseinhibitors STI571 gehemmt werden kann, zeichnet sich hier möglicherweise eine antimetastatische Therapieoption ab, welche in weiterführenden Untersuchungen überprüft werden wird.
Abstract
Background
Invasion and metastatic dissemination of tumor cells defines the prognosis of patients with colorectal cancer (CRC). The Abelson interactor 1 (Abi1), a 65 kD substrate of the eponymous Abelson tyrosine kinase, interacts with phosphatidylinositol-3-kinase (PI3K) and heterogeneous nuclear ribonucleoprotein K (hnRNP K) and is a key regulator of cytoskeletal reorganization during synaptic maturation and cellular migration.
Aim
The aim of this study was the analysis of Abi1 expression patterns and to elucidate the role in cytoskeletal reorganization in colorectal carcinoma cells.
Material and methods
The methods used in this study were immunohistochemistry; immunofluorescence microscopy; liposomal transfection and protein analysis by Western blotting.
Results
The results showed that Abi1 is expressed at the invasive front of colorectal carcinomas and localizes to the leading edge of lamellipodia in cultured colorectal carcinoma cells. A phosphorylated isoform of Abi1 that stains positively in these microcompartments disappears after treatment with the tyrosine kinase inhibitor STI571 (Glivec®). The RNA interference (RNAi) approach knockdown of Abi1 as well as treatment with STI571 induce a shift in cellular morphology from broad lamellipodia-like to thin filopodia-like cellular protrusions.
Discussion
The initial results support a central role for phosphorylated Abi1 in the formation of lamellipodia-like cellular protrusions as a prerequisite for cellular migration of colorectal carcinoma cells. As phosphorylation of Abi1 could be pharmaceutically targeted with STI571, this indicates a possible therapeutic option to prevent the gain of a metastatic phenotype in colorectal cancer. This possibility will be further evaluated in ongoing research.
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Einhaltung ethischer Richtlinien
Interessenkonflikt. K. Steinestel, F. Gläsle, S. Brüderlein, J. Steinestel, C. Pröpper, P. Möller geben an, dass kein Interessenkonflikt besteht. Alle angewandten Verfahren stehen im Einklang mit den ethischen Normen der verantwortlichen Kommission für Forschung am Menschen (institutionell und national) und mit der Deklaration von Helsinki von 1975 in der revidierten Fassung von 2008. Alle Patienten wurden erst nach erfolgter Aufklärung und Einwilligung in die Studie eingeschlossen.
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Dieses Projekt wurde im Rahmen der Nachwuchsakademie 2012 der Deutschen Gesellschaft für Pathologie finanziell unterstützt. The supplement this article is part of is not sponsored by the industry.
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Steinestel, K., Gläsle, F., Brüderlein, S. et al. Abelson interactor 1 (Abi1) im kolorektalen Karzinom. Pathologe 34 (Suppl 2), 189–194 (2013). https://doi.org/10.1007/s00292-013-1810-1
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DOI: https://doi.org/10.1007/s00292-013-1810-1