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. Author manuscript; available in PMC: 2023 Aug 1.
Published in final edited form as: Nat Biotechnol. 2022 Aug 29;41(2):252–261. doi: 10.1038/s41587-022-01429-5

Extended Data Fig. 6. UB progenitor cells participate in niche interactions in chimeric explants but not with hPSC-derived metanephric cells.

Extended Data Fig. 6

a, Cells from induced UB organoids and metanephric kidney organoids were dissociated at day 7, mixed and reaggregated, and cultured as spheres in suspension. Within two days (at day 9) the GATA3/KRT8-expressing UB cells had formed an epithelial network in the inner portion of the organoid. Metanephric cells (PAX2 only) were differentiating around the periphery of the structure in close association with the UB cells. However, we did not observe formation of capping mesenchyme structures or branching within the UB epithelium. b, Brightfield image with visualization of the UB epithelium using GATA3-mScarlet reporter confirmed the absence of significant branching morphogenesis. c, In chimeric explants with mouse fetal kidneys, the human induced UB cells (indicated by human nuclear antigen detection) incorporated into the UB tip (Cdh1-positive) at a high frequency, but never into the surrounding metanephric progenitors (Wt1 and Six2). Shown are six representative examples of progenitor niches that contained human cells. Scale bars, 200 μm (a and b) and 20 μm (c).