Endothelial Notch1 Activity Facilitates Metastasis
Menée à l'aide d'échantillons tumoraux prélevés sur des patients atteints d'un cancer (poumon, ovaire, côlon-rectum, sein, mélanome), puis à l'aide de modèles murins, cette étude met en évidence des mécanismes par lesquels, en induisant un endothélium pro inflammatoire et sénescent, la signalisation Notch favorise le processus métastatique
Endothelial cells (ECs) provide angiocrine factors orchestrating tumor progression. Here, we show that activated Notch1 receptors (N1ICD) are frequently observed in ECs of human carcinomas and melanoma, and in ECs of the pre-metastatic niche in mice. EC N1ICD expression in melanoma correlated with shorter progression-free survival. Sustained N1ICD activity induced EC senescence, expression of chemokines and the adhesion molecule VCAM1. This promoted neutrophil infiltration, tumor cell (TC) adhesion to the endothelium, intravasation, lung colonization, and postsurgical metastasis. Thus, sustained vascular Notch signaling facilitates metastasis by generating a senescent, pro-inflammatory endothelium. Consequently, treatment with Notch1 or VCAM1-blocking antibodies prevented Notch-driven metastasis, and genetic ablation of EC Notch signaling inhibited peritoneal neutrophil infiltration in an ovarian carcinoma mouse model.
Cancer Cell 2017