Characterization of the epidermal-dermal junction in hiPSC-derived skin organoids. Les Langerhanoïdes , des organoïdes d’îlots pancréatiques

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Ramovs, Veronika | Janssen, Hans | Fuentes, Ignacia | Pitaval, Amandine | Rachidi, Walid | Chuva de Sousa Lopes, Susana | Freund, Christian | Gidrol, Xavier | Mummery, Christine | Raymond, Karine

Edité par CCSD ; Elsevier -

Human induced pluripotent stem cell (hiPSC)-derived hair-bearing skin organoids offer exciting new possibilities for modeling diseases like epidermolysis bullosa (EB). These inherited diseases affect 1 in 30,000 people worldwide and result from perturbed expression and/or structure of components of the epidermal-dermal junction (EDJ). To establish whether hiPSC-derived skin organoids might be able to capture salient features of EB, it is thus important to characterize their EDJ. Here, we report successful generation of hair-bearing skin organoids from two hiPSC lines that exhibited fully stratified interfollicular epidermis. Using immunofluorescence and electron microscopy, we showed that basal keratinocytes in organoids adhere to laminin-332 and type IV collagen-rich basement membrane via type I hemidesmosomes and integrin β1-based adhesion complexes. Importantly, we demonstrated that EDJs in organoids are almost devoid of type VII collagen, a fibril that mediates anchorage of the epidermis to dermis. This should be considered when using skin organoids for EB modeling. . Les îlots de Langerhans isolés de donneurs en état de mort encéphalique constituent actuellement la seule source de cellules pour la transplantation de patients atteints de diabète de type 1. Cette approche thérapeutique reste cependant compromise par la rareté des donneurs et par certains aspects techniques. L’utilisation de sources alternatives de cellules productrices d’insuline est donc un enjeu tant thérapeutique que pour la recherche pharmacologique. Plusieurs équipes dans le monde, dont la nôtre, développent des modèles de culture cellulaire en 3D, les Langerhanoïdes , qui sont physiologiquement proches des îlots pancréatiques humains. Dans cette revue, nous décrivons les récentes avancées mimant la niche pancréatique (matrice extracellulaire, vascularisation, microfluidique), permettant ainsi d’accroître la fonctionnalité de ces Langerhanoïdes .

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