Objectif Tumor metastasis is responsible for >90% of cancer deaths. A tumor type where the mechanisms driving this process are especially unclear is melanoma, the only cancer where apparently thin lesions (2 mm depth) have a high potential for metastatic dissemination. As a PhD student in P. Agostinis lab (KUL, Belgium) I identified a new strategy using the lysosomotropic agent chloroquine (CQ) to blunt melanoma metastasis, by normalizing the angiogenic vasculature via increased blood endothelial cell (BEC) NOTCH signaling. The complete abolishment of metastasis by CQ urged me to study whether another route of metastasis; the lymphatic system and the sentinel lymph nodes (SLN); was also affected. The importance of this route of metastasis is supported by recent evidence showing that even before the arrival of the tumor cells, the lymph endothelial cells (LEC) and immune cells in the SLN undergo dynamic changes that actively facilitate tumor cell recruitment, metastatic outgrowth and immune tolerance. This phenomenon is referred to as the ‘lymphovascular (pre)metastatic niche’. Pending questions are how the cancer cells, LEC and immune cells crosstalk and how to target them pharmacologically. My preliminary data, obtained during a short term EMBO Fellowship in the lab of M. Soengas (CNIO, Spain) show that CQ affects lymphangiogenesis even more than angiogenesis. These effects are due to an unexpected different wiring of the NOTCH pathway in BEC versus LEC. Activated LECs express high levels of the NOTCH ligand DLL4, which is trapped and inactivated in the endosomal compartment by CQ. Genetic interference in LEC revealed that DLL4 not only regulates lymphangiogenesis, but also the production of mediators of cancer cell homing and immune tolerance. In this project I will address the mechanistic role of DLL4 in the establishment of the lymphovascular niche, correlate DLL4 levels with melanoma patient prognosis and target DLL4 pharmacologically to improve therapeutic outcome. Champ scientifique medical and health sciencesclinical medicineoncologyskin cancermelanomamedical and health sciencesbasic medicineimmunology Mots‑clés Metastasis cancer Melanoma Lymph endothelial cells DLL4 (pre)metastatic lymphovascular niche immune tolerance Programme(s) H2020-EU.1.3. - EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions Main Programme H2020-EU.1.3.2. - Nurturing excellence by means of cross-border and cross-sector mobility Thème(s) MSCA-IF-2015-EF - Marie Skłodowska-Curie Individual Fellowships (IF-EF) Appel à propositions H2020-MSCA-IF-2015 Voir d’autres projets de cet appel Régime de financement MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF) Coordinateur FUNDACION SECTOR PUBLICO ESTATAL CENTRO NACIONAL INVESTIGACIONES ONCOLOGICAS CARLOS III Contribution nette de l'UE € 158 121,60 Adresse C MELCHOR FERNANDEZ ALMAGRO 3 28029 Madrid Espagne Voir sur la carte Région Comunidad de Madrid Comunidad de Madrid Madrid Type d’activité Research Organisations Liens Contacter l’organisation Opens in new window Site web Opens in new window Participation aux programmes de R&I de l'UE Opens in new window Réseau de collaboration HORIZON Opens in new window Coût total € 158 121,60