Entwicklung eines neuen Zellisolationsverfahrens zur Erforschung der Mammakarzinompathogenese und -angiogenese für experimentelle in vitro und in vivo Assays

 

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Zusammenfassung

Hintergrund Brustkrebs gilt als die weltweit häufigste Krebserkrankung bei Frauen. Zunehmend wird autologer Lipotransfer zum Wiederaufbau der Brust nach Tumorresektion angewandt. Im zellunterstützenden Lipotransfer wird das Transplantat mit Stammzellen aus dem Fettgewebe (ADSC) angereichert. Trotz der positiven klinischen Ergebnisse gibt es aufgrund des Stammzellanteils Bedenken hinsichtlich der onkologischen Sicherheit. Bislang gibt es nur wenige Studien mit primären Zellen aus derselben Patientin, durch die es möglich werden könnte die Komplexität der Zell-Zell-Interaktionen im Mamma(karzinom)gewebe besser in experimentellen Settings darzustellen.

Material und Methoden Es wurde eine Literaturrecherche zum Thema autologer Lipotransfer durchgeführt. Aus Mamma(karzinom)gewebe, bzw. Blut wurden 5 unterschiedliche Zelltypen (epitheliale, mesenchymale Zellen, ADSC, Endothelzellen, endotheliale Progenitorzellen) isoliert und nachfolgend hinsichtlich ihrer Gen- und Proteinexpression sowie funktioneller Eigenschaften charakterisiert. Das arteriovenöse (AV) loop Modell in der Ratte wurde als mögliches in vivo Modell für die Mammakarzinompathogenese und -angiogenese im Rahmen dieser Studie evaluiert.

Ergebnisse In der Literatur konnten Hinweise auf eine in vitro Interaktion zwischen ADSC und Zellen des Mamma(karzinom)gewebes gefunden werden. In einigen klinischen Studien erschienen bestimmte Patientensubgruppen einem erhöhten Tumorrezidivrisiko nach Lipotransfer ausgesetzt zu sein, jedoch konnte in der Mehrzahl der Studien kein Zusammenhang zwischen Lipotransfer und Rezidivrate festgestellt werden. Aus Gewebe derselben Patientin konnten unterschiedliche Zellpopulationen isoliert werden, die sich hinsichtlich ihrer Oberflächenmarker, der Genexpression sowie funktioneller Eigenschaften deutlich voneinander differenzieren lassen. Im AV loop Modell konnte erfolgreich axial vaskularisiertes Gewebe gezüchtet werden.

Schlussfolgerung Anhand dieser Studie können wir erstmalig zeigen, dass aus derselben Gewebeprobe unterschiedliche Zellpopulationen isoliert werden können, die die Heterogenität im Tumorgewebe widerspiegeln. Dadurch werden exakte Analysen der Zell-Zell-Interaktionen und ihre Auswirkungen auf die Tumorangiogenese und -pathogenese im Mammakarzinom möglich. In Kombination mit dem AV loop Modell könnten neue Wege eröffnet werden vaskularisiertes Mammakarzinom- sowie gesundes Mammagewebe in vivo als optimales Modell für das klinische Setting zu generieren.

Abstract

Background Breast cancer is the world’s most common cancer among women. Autologous lipotransfer is increasingly used for breast reconstruction following surgical removal of the tumour. In cell-assisted lipotransfer, the transplant is enriched with stem cells from adipose tissue (ADSC). Despite positive clinical results, there are some concerns regarding oncological safety due to transplanted stem cells. To date there are only a few breast cancer studies using primary cells from the same patient to enable further investigation into the complexity of cell-cell interactions in breast cancer in an experimental setting.

Materials and methods We performed literature research on the topic of autologous lipotransfer. 5 different cell types (epithelial, mesenchymal cells, ADSC, endothelial cells, endothelial progenitor cells) were isolated from mammary (carcinoma) tissue or blood and were subsequently characterised for gene and protein expression as well as functional properties. The arteriovenous (AV) loop model in the rat was evaluated as a possible in vivo model for breast cancer pathogenesis and angiogenesis in this study.

Results The literature provided evidence for an in-vitro interaction between ADSC and cells of the mammary (carcinoma) tissue. In some clinical studies, certain subgroups of patients appeared to be exposed to an increased risk of tumour recurrence after lipotransfer, but in most studies no correlation between lipotransfer and tumour recurrence was found. Different cell populations, which differed significantly in terms of surface markers, gene expression and functional properties, were isolated from tissue of the same patient. Axial vascularised tissue was successfully generated in the AV loop model.

Conclusion In this study we were able to isolate different cell populations from the same patient, which reflect the heterogeneity of the tumour tissue. This enables a precise analysis of cell-cell interactions and their effects on tumour angiogenesis and pathogenesis in breast cancer. In combination with the AV loop model, this offers new possibilities to generate vascularised mammary carcinoma tissue as well as healthy mammary gland tissue in vivo as an optimal model for the clinical setting.

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