Directed differentiation of human pluripotent stem cells (hPSCs) into functional ureteric and collecting duct (CD) epithelia is essential to kidney regenerative medicine. Here we describe highly efficient, serum-free differentiation of hPSCs into ureteric bud (UB) organoids and functional CD cells. The hPSCs are first induced into pronephric progenitor cells at 90% efficiency and then aggregated into spheres with a molecular signature similar to the nephric duct. In a three-dimensional matrix, the spheres form UB organoids that exhibit branching morphogenesis similar to the fetal UB and correct distal tip localization of RET expression. Organoid-derived cells incorporate into the UB tips of the progenitor niche in chimeric fetal kidney explant culture. At later stages, the UB organoids differentiate into CD organoids, which contain >95% CD cell types as estimated by single-cell RNA sequencing. The CD epithelia demonstrate renal electrophysiologic functions, with ENaC-mediated vectorial sodium transport by principal cells and V-type ATPase proton pump activity by FOXI1-induced intercalated cells.
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The scRNA-sequencing data from UB organoid differentiation are available at the Gene Expression Omnibus under accession number GSE206153. The RNA-seq data from microdissected mouse collecting ducts were download from the RNA-seq data from the Mouse Renal Epithelial Cell Atlas (https://esbl.nhlbi.nih.gov/MRECA/Nephron/).
Relevant code will be made available upon reasonable request.
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We thank members of the Bonventre and Valerius laboratories for reagents and feedback related to this project, especially M. Zarei for assistance in electrophysiology experiments. We thank L. Palmer (Weill Cornell Medicine) for kindly providing purified antibodies to ENaC subunits. We appreciate the outstanding technical expertise from both the Single Cell Core and the BioPolymers Facility at Harvard Medical School for their assistance in completing the scRNA-seq experiments. We also thank J. Thiagarajah and W. Lencer (Boston Children’s Hospital) and the Harvard Digestive Disease Center (P30DK034854) for access and assistance with the Ussing chamber. This work is supported by grants from the National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Diseases and National Institutes of Health/National Center for Advancing Translational Sciences (UH3 TR002155 and R37 DK39773, to J.V.B) and a grant from the University of Virginia Pediatric Center of Excellence Pilot and Feasibility Program (P50 DK096373). K.W.M. was also supported by National Institutes of Health training grant T32 DK00772, and K.W.M. and A.B.P. were supported by grants from the Benjamin J. Lipps Fellowship from the American Society of Nephrology. M.S. was supported by a scholarship from West China School of Medicine/West China Hospital of Sichuan University. W.Z. was supported by a scholarship from Zhongshan Hospital of Fudan University. BioRender software was used in the production of Fig. 3a.
J.V.B. is an inventor on kidney organoid patents assigned to Mass General Brigham and is co-founder and holds equity in Goldfinch Bio. K.W.M. has kidney organoid patents pending. J.V.B.ʼs interests were reviewed and are managed by Brigham and Women’s Hospital and Mass General Brigham in accordance with their conflict of interest policies. The other authors have no competing financial interests to declare.
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Extended Data Fig. 1 Generation of GATA3-mScarlet reporter allele.
Schematic representation depicting targeting scheme for CRISPR/Cas9-mediated knock-in of mScarlet into human GATA3 locus in H9 hESC line. The donor vector containing P2A-mScarlet and Hygro resistance cassette with flanking homology arms was co-transfected into cells with plasmid co-expressing Cas9 and gRNA targeting GATA3 stop codon.
Extended Data Fig. 2 Efficient induction of pronephric IM cells at day 3.
a, Brightfield micrographs demonstrating appearance of undifferentiated hESCs at day 0, as well cultures after 24 and 30 hours exposure to primitive streak-inducing factors. At 24 hours, there was still significant colony-like morphology consistent with incomplete induction of mesendoderm cells, but after six additional hours the colonies were nearly completely dissociated into single, mesenchymal-like cells. b, Quantification of IF staining for TBXT (as shown in Fig. 1b) revealed >95% efficiency after 30 hours exposure. n = 6 quantified fields from three independent replicates. c, Timecourse qPCR analysis corresponding to Fig. 1c. The primitive streak marker MIXL1 was maximally expressed at day 1 and was subsequently quickly down-regulated, while IM markers OSR1, HOXB7, HNF1B, and SOX9 were increased by day 3. n = 3 independent biological replicates per timepoint. d, Efficient specification and expression of pronephric IM genes at day 3 was dependent on the combinatorial effects of FGF2, RA, TGFβ inhibition (A83-01), and BMP inhibition (LDN193189) during days 1-3. n = 3 independent biological replicates per condition. e, In the pronephric IM cultures at days 3 and 7, there was low level of expression of posterior IM markers (WT1, SIX2, EYA1, and HOXA11), which were derived from a differentiation protocol for inducing metanephric progenitor cells. *, p < 0.05; **p < 0.005; two-tailed Student’s t-test individually comparing day 3 and day 7 against the day 9 posterior IM samples; n = 4 biological replicates, data representative of 2 independent experiments. Specifically p-values for comparisons using day 3 were 0.005, 0.006, 0.0005, and 0.017 for WT1, SIX2, EYA1, and HOXA11, respectively; at day 7, they were 0.007, 0.007, 0.0002, and 0.015. f, From days 1-3, the TGFβ inhibitor A8301 was required for suppression of definitive endoderm (SOX17) fate, whereas BMP inhibition with LDN193189 inhibited formation of lateral plate mesoderm (FOXF1). *p < 0.005; two-tailed Student’s t-test; n = 3 biological replicates, data representative of 2 independent experiments. Scale bar 200 μm (a). Column and error bars represent mean and standard deviation, respectively.
Extended Data Fig. 3 Characterization of nephric duct spheroids.
a, Pronephric IM cells aggregated at day 3 efficiently formed numerous compact spheroids that maintained high levels of GATA3 expression over the course of their development. b, When either FGF2 or FGF8 was used in place of FGF9 from days 3-5, the spheres were more loosely organized and exhibited lower expression of GATA3. c, Micrograph of a small region of nephric duct progenitors plated on a patterned microwell, demonstrating high degree of uniformity of size, shape, and structure of the spheroids. d, From days 4-7, the spheres maintained expression of early pronephric transcription factors LHX1 and HOXB7, and they also gradually acquired expression of nephric duct markers RET and EMX2. e, Over these several days of culture, qPCR analysis showed developmental increase in nephric duct genes RET, WNT11, WNT9B, and EMX2. n = 3 independent biological replicates per timepoint. f-g, Heatmap and expression plots representing scRNA-seq data from day 7 revealed high expression of nephric duct markers in clusters 2 and 3, with complementary expression of stromal lineage genes in clusters 0 and 1 (in reference to UMAP in Fig. 1f). h, IF staining confirmed a high level of WT1-positivity in nephric duct lineage-negative cells at day 7. i, The differentiation of off-target lineages was not observed in the scRNA-seq dataset. Scale bars, 500 μm (a), 100 μm (b), 400 μm (c), 50 μm (d and h). Column and error bars represent mean and standard deviation, respectively.
Extended Data Fig. 4 UB organoid differentiation protocol is efficient when using hiPSCs.
a, Using the hiPSC line BJFF.6, a 30 hour exposure during the first stage of differentiation was also required for the primitive streak phenotype. b, AIM transcription factors PAX2, GATA3, LHX1, and HOXB7 were induced with very high efficiency by day 3. c, The hiPSC-derived AIM exhibited efficient formation of nephric duct spheroids in 96-well low attachment plates. The spheroids then underwent similar molecular and morphological development compared to those derived from hESCs as shown in Fig. 1. d, Nephric duct spheroids efficiently grew into branched UB organoids. e-f, hiPSC-derived UB organoids exhibited tip-stalk patterning and spontaneously formed differentiated AQP2-positive principal cells. Scale bars, 50 μm (a-d) and 100 μm (e-f).
Extended Data Fig. 5 Branching morphogenesis in UB organoids.
a, After embedding in 3-D matrix at day 7, the UB organoids exhibited several rounds of iterative branching during the first week of culture. The stereomicrograph of day 11 UB organoid demonstrates multiple terminal branching events, with each generation uniquely colored: 1=green, 2=red, 3=blue, 4=orange. b, A characteristic terminal bifurcation was demonstrated in the time course of micrographs. c, At later stages, such as day 18, branching was slowed and instead the distal UB tips formed enlarged knobs that more rarely underwent further cleavage events. d-e, Wholemount IF staining at days 9, 11, and 14 as shown in Fig. 2c with separation of channels. f, Expression of the transcription factor HNF1B increased between days 9 and 14. g, From day 7, the UB organoids showed a gradual decline in the tip marker WNT11 and a corresponding increase in the medullary stalk marker WNT7B. WNT9B, which is more broadly expressed in the stalk components, was maintained at relatively stable levels. n = 3 independent biological replicates per timepoint. Scale bars, 50 μm (a-c) and 200 μm (d-f). Column and error bars represent mean and standard deviation, respectively.
Extended Data Fig. 6 UB progenitor cells participate in niche interactions in chimeric explants but not with hPSC-derived metanephric cells.
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).
Extended Data Fig. 7 Characterization of CD organoids using scRNA-seq.
a, UB and CD transcription factors were abundant in clusters 0-4 identified in Fig. 3e, which contained >97% of the sequenced cells (b). c, Expression of markers associated with other differentiated nephron segments, including podocytes, proximal tubule, thick ascending limb of Henle’s loop (TAL), and distal convoluted tubule (DCT), was largely absent in the dataset. d, Mapping prediction scores from Azimuth analysis were notably higher in clusters 0-2, which contained the more differentiated principal cell populations, while the scores were fairly low in clusters 3 and 4. e, Similarly, the prediction scores for cells that mapped to alternative tubular fates (found almost exclusively in clusters 3 and 4) were generally much worse than those that mapped to collecting duct. f, UMAP of clusters 0-4 following random downsampling to 500 total cells that were used in Monocle trajectory analysis. g, The predicted lineage trajectory plotted by pseudotime, which corresponds to Fig. 3i.
Extended Data Fig. 8 Amiloride-sensitive sodium conductance in two-dimensional culture.
a, Tables showing raw data from voltmeter experiments using hESC-derived collecting duct cells. n.d., not done. b-c, Transepithelial voltage and resistance measurements in response to varying concentrations, including both pre- and post-amiloride treatment. Data shown (n = 4 per dose) are representative of at least three independent experiments. d, Quantification of RNA-seq expression levels of potassium channels from microdissected mouse CD segments42, including connecting tubule (CNT), cortical CD (CCD), outer medullary CD (OMCD) and inner medullary CD (IMCD). Kcnj1 and Kcnj10 were absent in the IMCD, while Kcnj13 and Kcnj16 were expressed in all CD regions. n = 7 independent biological replicates per segment. e, In day 18 CD organoids, only KCNJ16 was expressed at high levels in the scRNA-seq dataset. Column and error bars represent mean and standard deviation, respectively.
Extended Data Fig. 9 CD organoids resemble the IMCD with respect to IC differentiation.
a, Region-specific expression from the mouse CD42 revealed absence of IC-related genes (Atp6v1g3, Foxi1, and Tfcp2l1) in the IMCD, and markers of transitional PC/ICs were either reduced (Sec23b, Parm1) or absent (Syt7) in the IMCD. n = 3 independent biological replicates per timepoint. b, Expression in day 18 CD organoids was comparable to the mouse IMCD, with absence of ATP6V1G3 and FOXI1 and low level of TFCP2L1. The transitional cell gene SEC23B was expressed throughout the principal clusters, but neither PARM1 nor SYT7 were abundant. Column and error bars represent mean and standard deviation, respectively.
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Shi, M., McCracken, K.W., Patel, A.B. et al. Human ureteric bud organoids recapitulate branching morphogenesis and differentiate into functional collecting duct cell types. Nat Biotechnol 41, 252–261 (2023). https://doi.org/10.1038/s41587-022-01429-5
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