Patterns of Tumor Vasculogenesis on a Chick Embryo Chorioallantoic Membrane In Vivo Model of Breast Cancer.

ABSTRACT

BACKGROUND/AIM: Understanding tumor vasculogenesis is a cornerstone for the inhibition of tumor progression. This study aimed to generate an in vivo breast cancer environment to analyze the patterns of tumor vasculogenesis. MATERIALS AND METHODS: Human mesenchymal stem cells (hMSC) and breast cancer MCF-7 cells (MCF-7) were seeded onto a chorioallantoic membrane (CAM) and, after a 7-day incubation, we performed a morphological and immunohistochemical analysis of CAM. RESULTS: hMSC and MCF-7 activated vasculogenesis and hematopoiesis on CAM. They stimulated the development of cord/capillary-like structures (CLS), formed by endothelial-like cells and hematopoietic cells. CLS presented a polygonal pattern, evolving towards a clearly visible plexus. Immunohistochemically, CLS were CD105+/AC133+/Oct3/4+, and the intensity was weak-moderate in the endothelial-like cells (inconstant) and weak in the hematopoietic cells. CONCLUSION: Tumor and embryonic vasculogenesis share a common paradigm, while CD105, AC133, and Oct3/4 were found to play a role in establishing the vasculogenic and hematopoietic stage.