Foundation Hubrecht Organoid Technology 2 articles published in JoVE Biology Organoid-Derived Epithelial Monolayer: A Clinically Relevant In Vitro Model for Intestinal Barrier Function Wies T. M. van Dooremalen1, Merel Derksen1, Jamie Lee Roos1, Celia Higuera Barón1, Carla S. Verissimo1, Robert G. J. Vries1, Sylvia F. Boj1, Farzin Pourfarzad1 1Foundation Hubrecht Organoid Technology (HUB) Here, we describe the preparation of human organoid-derived intestinal epithelial monolayers for studying intestinal barrier function, permeability, and transport. As organoids represent original epithelial tissue response to external stimuli, these models combine the advantages of expandability of cell lines and the relevance and complexity of primary tissue. Medicine Forskolin-induced Swelling in Intestinal Organoids: An In Vitro Assay for Assessing Drug Response in Cystic Fibrosis Patients Sylvia F. Boj1, Annelotte M. Vonk2, Marvin Statia1, Jinyi Su1, Johanna F. Dekkers3, Robert R. G. Vries1, Jeffrey M. Beekman2, Hans Clevers1,4 1Foundation Hubrecht Organoid Technology, 2Department of Pediatric Pulmonology, Regenerative Medicine Centre Utrecht, Wilhelmina Children's Hospital, University Medical Centre Utrecht, 3Department of Stem Cells and Cancer, Walter and Eliza Hall Institute of Medical Research, 4Hubrecht Institute for Developmental Biology and Stem Cell Research, University Medical Centre Utrecht This protocol describes an assay for measuring CFTR function and CFTR modulator responses in cultured tissue from subjects with cystic fibrosis (CF). Biopsy-derived intestinal organoids swell in a cAMP-driven fashion, a response that is defective (or strongly reduced) in CF organoids and can be restored by exposure to CFTR modulators.