Description du projet
Un modèle in vitro de la niche périvasculaire
Le microenvironnement situé autour des capillaires sanguins est connu sous le nom de niche périvasculaire. Il joue un rôle important dans diverses maladies, notamment la neuroinflammation. Le projet B3M, financé par le Conseil européen de la recherche, s’est donné pour but d’étudier la niche périvasculaire des vaisseaux cérébraux en la recréant in vitro. En utilisant des hydrogels aux propriétés ajustables comme échafaudage et des cellules endothéliales dérivées de cellules souches pluripotentes induites, les chercheurs reconstitueront l’architecture et la fonction de la niche périvasculaire in vivo. Le dispositif in vitro permettra d’étudier les événements cellulaires et moléculaires qui dictent la pénétration des leucocytes dans la niche périvasculaire et conduisent à la neuroinflammation.
Objectif
In neuroinflammation leukocytes reside for several days in the perivascular niche of cerebral blood vessels - defined by the basal surface of the endothelium, the endothelial basement membrane (BM) and an outer parenchymal BM with associated astrocyte endfeet (Fig. 1) - a poorly studied site but of utmost fundamental and clinical relevance. This site is also emerging as harbouring genetically distinct resident cell populations, the function of which are unclear. BMs define the perivascular niche and the sealed nature of this compartment in an unknown manner. B3M will explore the perivascular niche of cerebral vessels. Using our new dextran-hydrogel with tuneable adhesive, stiffness and degradability properties and cerebral endothelial cells derived from induced pluripotent stem cells (iPSC) we will recreate the subendothelial site; we will sequentially increase its complexity to reflect the in vivo spatial arrangement of cells and BMs, within the most correctly mimicked environmental properties, in a system that permits perfusion with immune cells and live imaging. Parallel ex vivo and synthetic approaches will further break down the complexity of this site into discrete steps and using multiscale imaging of new split-cre transgenic mice we will track, target and profile perivascular cells lacking BM receptors. Studies to date on leukocyte entry into the brain focus on endothelial properties or immune cell behaviour with little consideration of the 3D relationship between cellular and BM barriers and their functional interdependence. My unique knowledge on extracellular matrix structure/function of cerebral vessels and leukocyte migration into the brain, allows me to identify key elements of the perivascular niche and how they can be mimicked in vitro and targeted in vivo. B3M’s cross-disciplinary approach will decipher cellular and molecular events occurring after leukocyte penetration of the endothelium in the perivascular niche, shedding light on a black box.
Champ scientifique
Programme(s)
- HORIZON.1.1 - European Research Council (ERC) Main Programme
Thème(s)
Régime de financement
HORIZON-ERC - HORIZON ERC GrantsInstitution d’accueil
48149 MUENSTER
Allemagne