Zusammenfassung
Die Rolle der Tumorzell Interaktion mit der extrazellulären Matrix als auch die Tumorzell- Stromazell Interaktion sind für die Invasivität und somit für die Metastasierung von Tumorzellen von entscheidender Bedeutung. Experimentell kann die Tumorzell-Stromazell Interaktion zuverlässig mit Hilfe eines dreidimensionalen Konfrontationsassays, bei dem Tumorzellsphäroide mit embryonalen Hühnerherzsphäroiden konfrontiert werden, durchgeführt werden. Nach bereits 24h kann eine deutliche Infiltration von Tumorzellen in das embryonale Hühnerherzsphäroid mittels bildanalytischem Auswerteverfahren quantifiziert werden. Unter Einfluß von all-trans-Retinsäure (RA) findet eine Abnahme der Invasivität von Tumorzellen statt.
Sphäroide wurden auch verwendet, um die Tumorzell-Matrix Interaktion bezüglich gerichteter Zellmotilität unter Einfluß von RA zu untersuchen. Dabei wurden reaggregierte Tumor- bzw. Hühnerherzzellsphäroide auf verschiedenen Komponenten der extrazellulären Matrix und Komponenten der Basalmembran ausgebracht. Durch das Vermessen des sich nach 24h, 48h und 72h nach Ausbringung ergebenden Kreisdurchmessers, hervorgerufen durch auswandernde Zellen, kann eine Quantifizierung der gerichteten Motilität durchgeführt werden. Mit dieser in vitro-Methode zur Messung der gerichteten Motilität wurden Melanomzellen mit unterschiedlichem metastatischem Potential vom Menschen und von der Maus als auch embryonalen Hühnerherzzellen untersucht.
Es konnte durch diese Experimente gezeigt werden, daß die Geschwindigkeit mit der Zellen aus dem Sphäroid auswandern auf verschiedenen extrazellulären Matrixkomponenten unterschiedlich groß ist und daß die Invasivität nicht immer mit der gerichteten Motilität korreliert.
Unter Einfluß von lμM RA konnte auf Collagen I beschichtetem Glas bei den Mausmelanomzellen eine Zunahme des Kreisdurchmessers gegenüber den Kontrollwerten gemessen werden, wohingegen die embryonalen Hühnerherzzellen einen geringeren Kreisdurchmesser gegenüber den Kontrollwerten aufwiesen.
Summary
Tumour-host interaction and tumour interaction with the extracellular matrix plays a crucial role in invasiveness and determines cancer metastasis. To get insight in tumour-host interactions a reliable 3D confrontation assay could be performed where tumour spheroids will be confronted with chick embryonic heart spheroids. After 24h the infiltration of tumour cells into the chick embryonic heart spheroid can be evaluated using an image analysis Computer program. A reduction of tumour cell invasion can be seen under the influence of all-trans retinoic acid (RA).
Under the influence of RA spheroids were used to investigate the interaction of tumor cells with extracellular matrix concerning directional migration. Reaggregated spheroids consisting of tumour cells and chick embryonic heart cells were explanted on collagen or lamming coated surfaces. In evaluating the diameter change emerging from cells leaving the multicell spheroid after 24, 48 and 72 hours a quantification of directed motility can be made. We investigated cells with metastatic potential from human and murine origin and chick embryonic heart cells with this in vitro method of directional motility.
It could be shown that the directional migration depends on the coverslip coating and invasiveness is not strictly correlated with directional migration of the tumour cells. 1 μM all-trans Retinoic acid could increase the diameters in the case of murine melanoma cells whereas embryonic chick heart cells had decreased diameters on collagen Type I coated surfaces.
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Hartbauer, M., DeVaney, T., Ahammer, H., Tritthart, H. (2000). Die Motilität von menschlichen und Mausmelanomzellinien und embryonalen Hühnerherzzellen unter Einfluß von 1µM alltrans- Retinsäure. In: Schöffl, H., et al. Forschung ohne Tierversuche 2000. Ersatz- und Ergänzungsmethoden zu Tierversuchen. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6760-1_23
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DOI: https://doi.org/10.1007/978-3-7091-6760-1_23
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