Abstract
Background
Persistent human papilloma virus 16 (HPV16) infections are a major cause of cervical cancer. The integration of the viral DNA into the host genome causes E2 gene disruption which prevents apoptosis and increases host cell motility. In cervical cancer patients, survival is limited by local infiltration and systemic dissemination. Surgical control rates are poor in cases of parametrial infiltration. In these patients, radiotherapy (RT) is administered to enhance local control. However, photon irradiation itself has been reported to increase cell motility. In cases of E2-disrupted cervical cancers, this phenomon would impose an additional risk of enhanced tumor cell motility. Here, we analyze mechanisms underlying photon-increased migration in keratinocytes with differential E2 gene status.
Methods
Isogenic W12 (intact E2 gene status) and S12 (disrupted E2 gene status) keratinocytes were analyzed in fibronectin-based and serum-stimulated migration experiments following single photon doses of 0, 2, and 10 Gy. Quantitative FACS analyses of integrin expression were performed.
Results
Migration and adhesion are increased in E2 gene-disrupted keratinocytes. E2 gene disruption promotes attractability by serum components, therefore, effectuating the risk of local infiltration and systemic dissemination. In S12 cells, migration is further increased by photon RT which leads to enhanced expression of fibronectin receptor integrins.
Conclusion
HPV16-associated E2 gene disruption is a main predictor of treatment-refractory cancer virulence. E2 gene disruption promotes cell motility. Following photon RT, E2-disrupted tumors bear the risk of integrin-related infiltration and dissemination.
Zusammenfassung
Hintergrund
Persistierende Infektionen mit humanen Papillomaviren 16 (HPV16) sind ein Hauptauslöser des Zervixkarzinoms. Die Integration der viralen DNS in das Wirtszellgenom führt zum Integritätsverlust des E2-Gens, wodurch in der Wirtszelle Apoptose verhindert und Motilität gesteigert werden. In Zervixkarzinompatientinnen bestimmen die lokale Infiltration und die systemische Metastasierung die Überlebensraten. Bei parametraner Infiltration sind die Kontrollraten der Chirurgie schlecht, so dass die Photonenbestrahlung zur Steigerung der lokalen Kontrolle eingesetzt wird. Photonenbestrahlungen selbst sind jedoch als motilitätsfördernd beschrieben worden, so dass im Fall eines HPV16-integrierten Zervixkarzinoms diese Therapie ein zusätzliches Risiko der Förderung von Migration und Infiltration birgt. In der vorliegenden Arbeit untersuchen wir den Einfluss der genomischen HPV16-Integration auf die radiogene Modifizierbarkeit der Migration dysplastischer Keratinozyten.
Material und Methode
Isogene HPV16-infizierte Keratinozyten mit entweder intaktem (W12-) oder aber defizientem E2-Genstatus (S12) wurden in Fibronektin-basierten und serumstimulierten Migrationsexperimenten nach Photonenbestrahlung mit Einzeldosen von 0, 2 und 10,0 Gy analysiert. Im Anschluss erfolgten quantitative FACS-Bestimmungen der Integrinexpression.
Ergebnisse
Sowohl Migration als auch Adhäsion sind in E2-defizienten Keratinozyten gesteigert. In diesen Zellen zeigt sich eine signifikante Stimulierbarkeit der Migration durch Serumbestandteile. Ferner exprimieren diese Zellen nach Photonenbestrahlung signifikant mehr Fibronektin-bindende Integrine, wodurch ihr Migrationsvermögen radiogen deutlich gesteigert wird.
Schlussfolgerungen
Der durch die Integration von HPV16 verursachte Verlust des E2-Gens stellt eine Ursache radioresistenter Tumorvirulenz dar. E2-defiziente Zellen sind nicht nur hypermotil und durch Serumbestandteile lockbar, sondern zeigen nach Photonenbestrahlung eine gesteigerte Integrinexpression, welche das Risiko für Infiltration und Metastasierung zusätzlich begünstigt.
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Rieken, S., Simon, F., Habermehl, D. et al. Photon-induced cell migration and integrin expression promoted by DNA integration of HPV16 genome. Strahlenther Onkol 190, 944–949 (2014). https://doi.org/10.1007/s00066-014-0649-6
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DOI: https://doi.org/10.1007/s00066-014-0649-6