Abstract
Urinary collecting tubules form during kidney embryogenesis through the branching of the ureteric bud epithelium. A travelling mesenchyme niche of nephron progenitor cells caps each branching ureteric bud tip. These âtip domainâ niches pack more closely over developmental time and their number relates to nephron endowment at birth. Yet, how the crowded tissue environment impacts niche number and cell decision-making remains unclear. Here, through experiments and mathematical modelling, we show that niche packing conforms to physical limitations imposed by kidney curvature. We relate packing geometries to rigidity theory to predict a stiffening transition starting at embryonic day 15 in the mouse, validated by micromechanical analysis. Using a method to estimate tip domain âagesâ relative to their most recent branch events, we find that new niches overcome mechanical resistance as they branch and displace neighbours. This creates rhythmic mechanical stress in the niche. These findings expand our understanding of kidney development and inform engineering strategies for synthetic regenerative tissues.
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Data availability
All data necessary to evaluate the conclusions of this study are presented in the paper and Supplementary Information. Raw image stacks are available upon request due to prohibitive file sizes. Source data are available via Github at https://github.com/ahug030/kidney_jamming.
Code availability
Code used to generate curvature and height maps, Voronoi networks and shape index data, and sphere packing simulations is available at https://github.com/ahug030/kidney_jamming.
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Acknowledgements
We thank the Hughes lab members Z. Gartner, C. Nelson and M. Little for discussions and advice. We are grateful to K. Bennett at the Molecular Pathology and Imaging Core, Gastroenterology Division, Penn Medicine for technical assistance with laser ablation studies; and D. Li and P. Janmey for access to and training on microindentation. We thank N. Lindström for sending the supplementary image files from ref. 22. This work was supported by the following: NIH F32 fellowship DK126385 and Penn Center for Soft & Living Matter fellowship (L.S.P.), the Predoctoral Training Program in Developmental Biology T32HD083185 (J.M.V.), National Science Foundation (NSF) Graduate Research Fellowship Program (GRFP; J.L., T.J.C., G.H.-L. and C.M.P.), NIH National Institute of Child Health and Human Development (NICHD) K25HD097288 (J.Z.), NIH NICHD R21HD112663 (J.Z.), NIH National Institute of General Medical Sciences (NIGMS) Maximizing Investigatorsâ Research Award (MIRA) R35GM133380 (A.J.H.), NIH National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) R01DK132296 (A.J.H.) and NSF CAREER awards 2339278 (J.Z.) and 2047271 (A.J.H.).
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Conceptualization was by L.S.P., J.M.V., T.J.C. and A.J.H. Methodology was by L.S.P., J.L., J.M.V., A.H., T.J.C., G.H.-L., C.M.P., J.Z. and A.J.H. Software was by J.M.V., T.J.C., J.Z. and A.J.H. Formal analysis was by J.M.V., T.J.C., J.Z. and A.J.H. Investigation was by L.S.P., J.L., J.M.V., A.H., T.J.C., G.H.-L., C.M.P., C.S., J.Z. and A.J.H. Writing the original draught was by J.Z. and A.J.H. Reviewing and editing was by L.S.P., J.L., J.M.V., A.H., T.J.C., G.H.-L., C.M.P., J.Z. and A.J.H. Visualization was by L.S.P., J.M.V., T.J.C., G.H.-L., C.S., J.Z. and A.J.H. Supervision was by L.S.P., J.Z. and A.J.H. Project administration was by J.Z. and A.J.H.
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L.S.P., J.M.V., J.L., A.H., C.M.P. and A.J.H. are listed as co-inventors on a published University of Pennsylvania international patent (WO 2023/235828 A1) relating to mechanics of nephrogenesis.
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Supplementary Figs. 1â10, Video Captions 1â3, Notes 1â11 and references.
Supplementary Video 1
Coordination of UB tip branching morphogenesis and nephron formation.
Supplementary Video 2
Asynchronous tip branching disrupts crystal-packed regions of tip domains in silico.
Supplementary Video 3
Laser ablation causes rebound of cap mesenchyme and stroma between pairs of UB tips.
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Prahl, L.S., Liu, J., Viola, J.M. et al. Jamming of nephron-forming niches in the developing mouse kidney creates cyclical mechanical stresses. Nat. Mater. 23, 1582â1591 (2024). https://doi.org/10.1038/s41563-024-02019-3
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DOI: https://doi.org/10.1038/s41563-024-02019-3