Interplay between cytokine and FGF2 signaling in induction of entosis and vasculogenic mimicry response in glioblastoma

Abstract

Tumor vascularization is critical to survival of cancer cells, but is frequently perturbed leading to disorganized angiogenesis and emergence of alternative means of delivery of oxygen and nutrients, such as vasculogenic mimicry (VM). Understanding of VM and its relationship to endothelial vascularization has been hampered by the lack of comprehensive combination of in vivo clinical data and relevant in vitro models. We address this challenge by analyzing glioblastoma (GBM) tumors and clinically isolated cancer cells. This analysis strongly suggests a key role of macrophage-induced controlled cell death in emergence of VM. The results further point to entosis of cancer cells as a critical intermediate state in this process, enabled by mechano-chemical cell heterogeneity. We find evidence that macrophages can regulate endothelial angiogenesis and VM as two alternative vascularization mechanisms. These results reveal mechanistic underpinnings of VM and pave the way to predictive analysis of tumor progression.