Abstract
Developing models of human kidney tissue in vitro is an important challenge in regenerative nephrology research, given the paucity of novel and effective therapies in kidney disease. However, the de novo generation of kidney tissues from human pluripotent stem cells (hPSCs) is challenging owing to the structural and functional complexity of the organ, as well its developmental origin from two distinct embryologic populations: the metanephric mesenchyme and the ureteric bud (UB). Directed differentiation strategies have been developed to generate kidney organoids containing nephron-like structures; we recently reported an efficient and practical method to generate UB tissues. Here, we describe a detailed step-by-step protocol for differentiation of hPSCs into three-dimensonal UB organoids that exhibit complex morphological development and the capacity to differentiate into functional collecting duct tissues. Over 3 d, hPSCs are induced into PAX2+GATA3+ pronephric (anterior) intermediate mesoderm fates in monolayer cultures at high efficiency. The cells are aggregated into three-dimensional spheroids, which then assemble and organize into nephric duct-like tissue over 4 d. When embedded into an extracellular matrix, the spheroids grow into UB organoids that recapitulate fetal branching morphogenesis for 1 week of culture. When switched to permissive conditions, the UB organoids spontaneously differentiate to form collecting duct principal cells. This approach provides robust and reproducible methods that can be readily adopted by users with basic experience in hPSC and organoid differentiation to generate UB tissues, which may be used to investigate human kidney development, model disease processes and catalyze further efforts in engineering functional kidney tissue.
Key points
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Human pluripotent stem cells are differentiated into three-dimensional ureteric bud organoids that exhibit complex morphological development and the capacity to differentiate into functional collecting duct tissues.
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The procedure accurately recapitulates early developmental stages and produces uretic bud structures showing branching via terminal bifurcation and stalk elongation. It can also be easily scaled as there is a high degree of inter- and intra-experimental consistency.
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Acknowledgements
This study was supported by funding from the National Institutes of Health National Institute for Diabetes and Digestive and Kidney Diseases and National Center for Advancing Translational Sciences (UH3 TR002155, R37 DK39773), and the Pediatric Center of Excellence at the University of Virginia (P50 DK096373). K.W.M. was supported by the National Institutes of Health training grant (T32 DK00772) and the Ben J. Lipps Fellowship from the American Society of Nephrology. M.S. was supported by National Natural Science Foundation of China (32100909) and Post-Doctor Research Project, West China Hospital, Sichuan University (2021HXBH016). Studies involving hPSCs were reviewed and approved by MGB Institutional Biosafety Committee (2011B000287). No new hESC lines were generated as part of this study.
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M.S., J.V.B. and K.W.M. conceived of this study and formulated experiments. M.S., J.V.B. and K.W.M. performed the experiments and wrote the manuscript. P.F. performed experiments and contributed to the writing of the manuscript.
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J.V.B. is an inventor on kidney organoid patents assigned to MGB, and is cofounder and holds equity in Goldfinch Bio. K.W.M. has kidney organoid patents pending. J.V.B.’s interests were reviewed and are managed by BWH and MGB in accordance with their conflict-of-interest policies. The remaining authors declare no competing interests.
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Shi, M. et al. Nat. Biotechnol. 41, 252–261 (2023): https://doi.org/10.1038/s41587-022-01429-5
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Shi, M., Fu, P., Bonventre, J.V. et al. Directed differentiation of ureteric bud and collecting duct organoids from human pluripotent stem cells. Nat Protoc 18, 2485–2508 (2023). https://doi.org/10.1038/s41596-023-00847-2
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DOI: https://doi.org/10.1038/s41596-023-00847-2
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