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Association of Indoleamine 2,3-Dioxygenase (IDO) Activity with Outcome after Cardiac Surgery in Adult Patients
Indoleamine 2,3-deoxygenase (IDO) plays an important role in the catabolism of the amino acid tryptophan. Tryptophan and its metabolites are key immune modulators. Increased IDO activity has been observed in various diseases and is associated with worse clinical outcomes. However, comprehensive research regarding its role in cardiac surgery remains limited. Therefore, we aimed to investigate perioperative changes in IDO activity and pathway metabolites, along with their impact on clinical outcomes in adult patients undergoing cardiac surgery. As an observational cohort study conducted at the Inselspital in Bern from January to December 2019, we retrospectively analyzed the data of prospectively collected biobank samples of patients undergoing cardiac surgery with the use of cardiopulmonary bypass. IDO pathway metabolite analysis was conducted by mass spectrometry. Perioperative dynamics were descriptively assessed and associated with pre-defined clinical outcome measures (30-day mortality, 1-year mortality, incidence of stroke and myocardial infarction, and length of hospital stay) through a multi-step exploratory regression analysis. A cohort of 192 adult patients undergoing cardiac surgery with the use of cardiopulmonary bypass were included (median age 67.0, IQR 60.0–73.0, 75.5% male). A significant perioperative decrease in the kynurenine/tryptophan (Kyn/Trp) ratio (−2.298, 95% CI −4.028 to −596, p = 0.009) and significant perioperative dynamics in the associated metabolites was observed. No association of perioperative changes in IDO activity and pathway metabolites with clinical outcomes was found. A significant decrease in the Kyn/Trp ratio among adult patients undergoing cardiac surgery indicates a perioperative downregulation of IDO, which stands in contrast to other pro-inflammatory conditions. Further studies are needed to investigate IDO in the setting of perioperative immunomodulation, which is a key driver of postoperative complications in cardiac surgery patients.
Figure 4 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>Renal cortex, but not the papilla, is permissive to long-term survival of <i>Vhl</i>-null cells. <b>A,</b> Representative tdTomato IHC counterstained with hematoxylin in different renal anatomical regions of Control or KO mice harvested at the early or late time points. Scale bar, 100 μm. Magnification, ×20. <b>B,</b> Proportion of cells that are tdTomato-positive in different regions of the kidney as quantified by tdTomato IHC in kidneys from Control or KO mice harvested at different intervals after recombination. <i>n</i> = 7F, 16M for all regions for KO; <i>n</i> = 9F, 15M; 9F, 15M; 9F, 14M; 8F, 14M for cortex, outer medulla, inner medulla, and papilla, respectively, for Control. Line denotes linear regression. Significance testing performed for slope and intercept of linear regression by <i>t</i> test.</p>
Figure 5 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p><i>Vhl</i>-null cells specifically undergo time-dependent alterations in gene expression. <b>A,</b> Density plot depicting UMAP distribution of tdTomato-positive cells from kidneys of Control and KO mice harvested at the early or late time points. <b>B,</b> Left, UMAP plot depicting tdTomato-positive cells from Control and KO mice harvested at the early and late time points colored by UMAP cluster. Right, proportion of cells from each condition belonging to any cluster. <b>C,</b> Scatter plot depicting frequency of expression in tdTomato-positive cells from KO mice at the late time point against log<sub>2</sub>-fold change (log<sub>2</sub>FC) between cells from KO mice at the late versus early time points for all genes. Orange, significantly regulated genes. Genes explicitly mentioned in the main text are labeled. <b>D,</b> Gene set enrichment plots depicting upregulation of genes regulated early after <i>Vhl</i> inactivation (left) or genes known to be HIF targets (right) in <i>Vhl</i>-null cells at the late versus early time points. NES, normalized enrichment score. <i>P</i> value adjusted by Bonferroni correction for multiple testing. <b>E,</b> UMAP plot depicting “PT like” cells among tdTomato-positive cells from Control and KO mice harvested at the early and late time points. Black, PT-like cells. <b>F,</b> Proportion of cells inferred to be “PT like” within tdTomato-positive (top) or tdTomato-negative (bottom) cells across conditions. Median and interquartile range plotted. Pairwise comparisons tested by one-way ANOVA with Holm–Šídák correction. <b>G,</b> Representative CD45 IHC on kidneys from Control (<i>n</i> = 1F, 4M) and KO (<i>n</i> = 6M) mice harvested at the late time point. Scale bar, 50 μm. Magnification, ×40. <b>A–F</b>, scRNA-seq data shown for <i>n</i> = 3F, 1M mice for Control early and Control late samples; <i>n</i> = 2F, 2M mice for KO early and KO late samples.</p>
Figure 6 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p><i>Vhl</i>-null cells exhibit time-dependent proliferation and association with ccRCC-like gene expression. <b>A,</b> Representative dual IHC for tdTomato (brown) and Ki67 (purple) counterstained with hematoxylin in kidneys of KO mice harvested early after recombination. Scale bar, 25 μm. Magnification, ×40. Black arrow, dual-positive cell; red arrow, tdTomato-negative Ki67-positive cell. <b>B,</b> Proportion of tdTomato-positive (top) or tdTomato-negative (bottom) cells that are positive for Ki67 by dual IHC in kidneys of Control and KO mice harvested early and late after recombination (<i>n</i> = 2F, 6M for Control early; <i>n</i> = 4F, 2M for KO early; <i>n</i> = 4F, 5M for Control late; <i>n</i> = 1F, 6M for KO late). Pairwise comparisons by Kruskal–Wallis test with Dunn correction. <b>C,</b> UMAP plot depicting RTE cells from Control and KO mice at the early and late time points. Orange, cells expressing <i>Mki67</i>. <b>D,</b> Proportion of tdTomato-positive (top) or tdTomato-negative (bottom) RTE cells that express <i>Mki67</i> in different conditions. Pairwise comparisons tested by one-way ANOVA with Holm–Šídák correction. <b>E,</b> Proportion of tdTomato-positive cells of different PT identities that express <i>Mki67</i> in different conditions. Pairwise comparisons tested by two-way ANOVA with Holm–Šídák correction. <b>F,</b> Violin plot overlaid with boxplot depicting expression score for genes upregulated in ccRCC cells known to be HIF targets (left) and not known to be HIF targets (right) in tdTomato-positive cells from Control and KO mice harvested at early or late time points. <b>G,</b> Scatter plot depicting changes in mean expression scores for HIF-target (top) and non-HIF-target (bottom) genes specifically upregulated in ccRCC, in tdTomato-positive cells of different PT identities from different conditions when compared with those from Control mice at the early time point. <b>B, D,</b> and <b>E</b>, Median and interquartile range plotted. Only significant (<i>P</i> < 0.05) comparisons shown. <b>C–G,</b> scRNA-seq data shown for <i>n</i> = 3F, 1M mice for tdTomato-positive and tdTomato-negative Control early and Control late samples; <i>n</i> = 2F, 1M mice for tdTomato-negative KO early samples; <i>n</i> = 2F, 2M mice for tdTomato-positive KO early samples; <i>n</i> = 2F, 2M mice for tdTomato-positive and tdTomato-negative KO late samples.</p>
Supplementary Figure S2 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>Biallelic Vhl loss entrains early cell-specific transcriptomic changes in renal tubular cells</p>
Figure 5 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p><i>Vhl</i>-null cells specifically undergo time-dependent alterations in gene expression. <b>A,</b> Density plot depicting UMAP distribution of tdTomato-positive cells from kidneys of Control and KO mice harvested at the early or late time points. <b>B,</b> Left, UMAP plot depicting tdTomato-positive cells from Control and KO mice harvested at the early and late time points colored by UMAP cluster. Right, proportion of cells from each condition belonging to any cluster. <b>C,</b> Scatter plot depicting frequency of expression in tdTomato-positive cells from KO mice at the late time point against log<sub>2</sub>-fold change (log<sub>2</sub>FC) between cells from KO mice at the late versus early time points for all genes. Orange, significantly regulated genes. Genes explicitly mentioned in the main text are labeled. <b>D,</b> Gene set enrichment plots depicting upregulation of genes regulated early after <i>Vhl</i> inactivation (left) or genes known to be HIF targets (right) in <i>Vhl</i>-null cells at the late versus early time points. NES, normalized enrichment score. <i>P</i> value adjusted by Bonferroni correction for multiple testing. <b>E,</b> UMAP plot depicting “PT like” cells among tdTomato-positive cells from Control and KO mice harvested at the early and late time points. Black, PT-like cells. <b>F,</b> Proportion of cells inferred to be “PT like” within tdTomato-positive (top) or tdTomato-negative (bottom) cells across conditions. Median and interquartile range plotted. Pairwise comparisons tested by one-way ANOVA with Holm–Šídák correction. <b>G,</b> Representative CD45 IHC on kidneys from Control (<i>n</i> = 1F, 4M) and KO (<i>n</i> = 6M) mice harvested at the late time point. Scale bar, 50 μm. Magnification, ×40. <b>A–F</b>, scRNA-seq data shown for <i>n</i> = 3F, 1M mice for Control early and Control late samples; <i>n</i> = 2F, 2M mice for KO early and KO late samples.</p>
Data from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<div>Abstract<p>Defining the initial events in oncogenesis and the cellular responses they entrain, even in advance of morphologic abnormality, is a fundamental challenge in understanding cancer initiation. As a paradigm to address this, we longitudinally studied the changes induced by loss of the tumor suppressor gene von Hippel Lindau (<i>VHL</i>), which ultimately drives clear cell renal cell carcinoma. <i>Vhl</i> inactivation was directly coupled to expression of a tdTomato reporter within a single allele, allowing accurate visualization of affected cells in their native context and retrieval from the kidney for single-cell RNA sequencing. This strategy uncovered cell type–specific responses to <i>Vhl</i> inactivation, defined a proximal tubular cell class with oncogenic potential, and revealed longer term adaptive changes in the renal epithelium and the interstitium. Oncogenic cell tagging also revealed markedly heterogeneous cellular effects including time-limited proliferation and elimination of specific cell types. Overall, this study reports an experimental strategy for understanding oncogenic processes in which cells bearing genetic alterations can be generated in their native context, marked, and analyzed over time. The observed effects of loss of <i>Vhl</i> in kidney cells provide insights into VHL tumor suppressor action and development of renal cell carcinoma.</p>Significance:<p>Single-cell analysis of heterogeneous and dynamic responses to <i>Vhl</i> inactivation in the kidney suggests that early events shape the cell type specificity of oncogenesis, providing a focus for mechanistic understanding and therapeutic targeting.</p></div>
Supplementary Figure S3 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>Vhl-null cells specifically undergo time-dependent alterations in gene expression</p>
Supplementary Table S1 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>scRNA-seq metrics, cell type markers, and lists of differentially expressed genes</p>
Supplementary Figure S1 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>Single-cell RNA sequencing on flow-sorted renal cells</p>
Figure 3 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>Biallelic <i>Vhl</i> inactivation entrains early cell-specific transcriptomic changes in RTE cells. <b>A,</b> Density plot depicting UMAP distribution of tdTomato-negative and -positive cells from kidneys of Control and KO mice harvested early after recombination. <b>B,</b> Left, UMAP plot depicting cells from Control and KO mice harvested early after recombination colored by UMAP clusters. Right, proportion of cells from each condition belonging to any cluster. <b>C,</b> Scatter plot depicting frequency of expression in tdTomato-negative (top) or tdTomato-positive (bottom) cells from KO mice against log<sub>2</sub>-fold change (log<sub>2</sub>FC) between cells from KO versus Control mice for all genes at the early time point. Orange, significantly regulated genes. Genes explicitly mentioned in the main text are labeled. <b>D,</b> Scatter plot depicting log<sub>2</sub>-fold change between tdTomato-positive cells from KO versus Control for genes significantly regulated in every renal cell identity. Blue, names of HIF target genes. <b>E,</b> PCA of gene expression changes early after <i>Vhl</i> inactivation in different renal cell identities. <b>A–E,</b> scRNA-seq data are shown for <i>n</i> = 3F, 1M for Control negative; <i>n</i> = 3F, 1M mice for Control positive samples; <i>n</i> = 2F, 1M mice for KO negative samples; <i>n</i> = 2F, 2M mice for KO-positive samples.</p>
Supplementary Figure S1 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>Single-cell RNA sequencing on flow-sorted renal cells</p>
Figure 6 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p><i>Vhl</i>-null cells exhibit time-dependent proliferation and association with ccRCC-like gene expression. <b>A,</b> Representative dual IHC for tdTomato (brown) and Ki67 (purple) counterstained with hematoxylin in kidneys of KO mice harvested early after recombination. Scale bar, 25 μm. Magnification, ×40. Black arrow, dual-positive cell; red arrow, tdTomato-negative Ki67-positive cell. <b>B,</b> Proportion of tdTomato-positive (top) or tdTomato-negative (bottom) cells that are positive for Ki67 by dual IHC in kidneys of Control and KO mice harvested early and late after recombination (<i>n</i> = 2F, 6M for Control early; <i>n</i> = 4F, 2M for KO early; <i>n</i> = 4F, 5M for Control late; <i>n</i> = 1F, 6M for KO late). Pairwise comparisons by Kruskal–Wallis test with Dunn correction. <b>C,</b> UMAP plot depicting RTE cells from Control and KO mice at the early and late time points. Orange, cells expressing <i>Mki67</i>. <b>D,</b> Proportion of tdTomato-positive (top) or tdTomato-negative (bottom) RTE cells that express <i>Mki67</i> in different conditions. Pairwise comparisons tested by one-way ANOVA with Holm–Šídák correction. <b>E,</b> Proportion of tdTomato-positive cells of different PT identities that express <i>Mki67</i> in different conditions. Pairwise comparisons tested by two-way ANOVA with Holm–Šídák correction. <b>F,</b> Violin plot overlaid with boxplot depicting expression score for genes upregulated in ccRCC cells known to be HIF targets (left) and not known to be HIF targets (right) in tdTomato-positive cells from Control and KO mice harvested at early or late time points. <b>G,</b> Scatter plot depicting changes in mean expression scores for HIF-target (top) and non-HIF-target (bottom) genes specifically upregulated in ccRCC, in tdTomato-positive cells of different PT identities from different conditions when compared with those from Control mice at the early time point. <b>B, D,</b> and <b>E</b>, Median and interquartile range plotted. Only significant (<i>P</i> < 0.05) comparisons shown. <b>C–G,</b> scRNA-seq data shown for <i>n</i> = 3F, 1M mice for tdTomato-positive and tdTomato-negative Control early and Control late samples; <i>n</i> = 2F, 1M mice for tdTomato-negative KO early samples; <i>n</i> = 2F, 2M mice for tdTomato-positive KO early samples; <i>n</i> = 2F, 2M mice for tdTomato-positive and tdTomato-negative KO late samples.</p>
Figure 4 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>Renal cortex, but not the papilla, is permissive to long-term survival of <i>Vhl</i>-null cells. <b>A,</b> Representative tdTomato IHC counterstained with hematoxylin in different renal anatomical regions of Control or KO mice harvested at the early or late time points. Scale bar, 100 μm. Magnification, ×20. <b>B,</b> Proportion of cells that are tdTomato-positive in different regions of the kidney as quantified by tdTomato IHC in kidneys from Control or KO mice harvested at different intervals after recombination. <i>n</i> = 7F, 16M for all regions for KO; <i>n</i> = 9F, 15M; 9F, 15M; 9F, 14M; 8F, 14M for cortex, outer medulla, inner medulla, and papilla, respectively, for Control. Line denotes linear regression. Significance testing performed for slope and intercept of linear regression by <i>t</i> test.</p>
Figure 2 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>scRNA-seq on flow-sorted renal cells. <b>A,</b> UMAP plot of tdTomato-negative (left) or tdTomato-positive cells (right) from kidneys of Control mice harvested at the early time point. Cells are colored by inferred cell type. LoH, loop of Henle; DCT, distal convoluted tubule; CD, collecting duct; PC, principal cell; IC, intercalated; PEC, parietal epithelial cell; VSMC, vascular smooth muscle cell; NK, natural killer cell. <b>B,</b> Proportion of sequenced cells inferred to be of each cell type in tdTomato-positive or tdTomato-negative populations from kidneys of Control mice harvested at the early time point. Median and interquartile range plotted. <b>C,</b> UMAP plot depicting expression of PT Module A (left) and PT Module B (right) genes in PT cells from Control mice. <b>D,</b> Representative <i>in situ</i> RNA hybridization exhibiting spatially distinct expression of <i>Neat1</i> (blue) and <i>Fxyd2</i> (red) mRNA in FFPE kidney cortex from Control mice harvested at the early time point. Scale bar, 10 μm. Magnification, ×40. <b>E,</b> UMAP plot depicting cells from Control mice at the early time point. Cells are colored by assigned PT Class. <b>A–E,</b> scRNA-seq data shown for <i>n</i> = 3 female (3F) and <i>n</i> = 1 male (1M) Control mice.</p>
Figure 2 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>scRNA-seq on flow-sorted renal cells. <b>A,</b> UMAP plot of tdTomato-negative (left) or tdTomato-positive cells (right) from kidneys of Control mice harvested at the early time point. Cells are colored by inferred cell type. LoH, loop of Henle; DCT, distal convoluted tubule; CD, collecting duct; PC, principal cell; IC, intercalated; PEC, parietal epithelial cell; VSMC, vascular smooth muscle cell; NK, natural killer cell. <b>B,</b> Proportion of sequenced cells inferred to be of each cell type in tdTomato-positive or tdTomato-negative populations from kidneys of Control mice harvested at the early time point. Median and interquartile range plotted. <b>C,</b> UMAP plot depicting expression of PT Module A (left) and PT Module B (right) genes in PT cells from Control mice. <b>D,</b> Representative <i>in situ</i> RNA hybridization exhibiting spatially distinct expression of <i>Neat1</i> (blue) and <i>Fxyd2</i> (red) mRNA in FFPE kidney cortex from Control mice harvested at the early time point. Scale bar, 10 μm. Magnification, ×40. <b>E,</b> UMAP plot depicting cells from Control mice at the early time point. Cells are colored by assigned PT Class. <b>A–E,</b> scRNA-seq data shown for <i>n</i> = 3 female (3F) and <i>n</i> = 1 male (1M) Control mice.</p>
Data from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<div>Abstract<p>Defining the initial events in oncogenesis and the cellular responses they entrain, even in advance of morphologic abnormality, is a fundamental challenge in understanding cancer initiation. As a paradigm to address this, we longitudinally studied the changes induced by loss of the tumor suppressor gene von Hippel Lindau (<i>VHL</i>), which ultimately drives clear cell renal cell carcinoma. <i>Vhl</i> inactivation was directly coupled to expression of a tdTomato reporter within a single allele, allowing accurate visualization of affected cells in their native context and retrieval from the kidney for single-cell RNA sequencing. This strategy uncovered cell type–specific responses to <i>Vhl</i> inactivation, defined a proximal tubular cell class with oncogenic potential, and revealed longer term adaptive changes in the renal epithelium and the interstitium. Oncogenic cell tagging also revealed markedly heterogeneous cellular effects including time-limited proliferation and elimination of specific cell types. Overall, this study reports an experimental strategy for understanding oncogenic processes in which cells bearing genetic alterations can be generated in their native context, marked, and analyzed over time. The observed effects of loss of <i>Vhl</i> in kidney cells provide insights into VHL tumor suppressor action and development of renal cell carcinoma.</p>Significance:<p>Single-cell analysis of heterogeneous and dynamic responses to <i>Vhl</i> inactivation in the kidney suggests that early events shape the cell type specificity of oncogenesis, providing a focus for mechanistic understanding and therapeutic targeting.</p></div>
Supplementary Figure S2 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>Biallelic Vhl loss entrains early cell-specific transcriptomic changes in renal tubular cells</p>
Supplementary Table S1 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>scRNA-seq metrics, cell type markers, and lists of differentially expressed genes</p>
Figure 1 from Oncogenic Cell Tagging and Single-Cell Transcriptomics Reveal Cell Type–Specific and Time-Resolved Responses to <i>Vhl</i> Inactivation in the Kidney
<p>A novel reporter model for <i>Vhl</i> inactivation in the mouse kidney. <b>A,</b> Design and recombination of the cell marking conditional <i>Vhl<sup>pjr</sup></i> allele. Double and single arrows indicate reversible and irreversible processes, respectively. <i>Vhl<sup>pjr.fl</sup>, Vhl<sup>pjr.inrec</sup></i>, and <i>Vhl<sup>pjr.KO</sup></i> refer to “floxed,” “incompletely recombined,” and “knockout” forms of the <i>Vhl<sup>pjr</sup></i> allele. P, <i>Vhl</i> promoter; U, untranslated region; E, <i>Vhl</i> exon; I, <i>Vhl</i> intron; pA, polyadenylation site; P2A, porcine teschovirus 2A peptide; SA, splice acceptor. Dashed lines, spliced and translated regions; lightning symbols, excitation and emission wavelengths for tdTomato fluorescence. Red stop sign indicates no interaction between VHL exon 1 fragment and HIFA-1/2 or Elongin B/C. <b>B,</b> Representative tdTomato IHC counterstained with hematoxylin in kidney sections and tdTomato fluorescence-based flow cytometry on renal cells from <i>Vhl<sup>wt/pjr.fl</sup>; Pax8-CreERT2</i> mice untreated (top) or given 5 × 2 mg tamoxifen (TMX; bottom) and harvested at the early time point. Scale bar, 250 μm. Magnification, ×20. FACS gates are shown. <b>C,</b> Gel electrophoresis of genomic PCR for <i>Vhl<sup>wt</sup>, Vhl<sup>pjr.fl</sup></i>, and <i>Vhl<sup>pjr.KO</sup></i> alleles performed on FAC-sorted tdTomato-positive (left) or tdTomato-negative (right) cells from kidneys of <i>Vhl<sup>wt/pjr.fl</sup>; Pax8-CreERT2</i> mice given tamoxifen and harvested at the early time point. <b>D,</b> Representative immunoblots (IB) for HIF1A, HIF2A, or tdTomato protein in tdTomato-negative (−) or tdTomato-positive (+) cells sorted by flow cytometry from dissociated kidneys of <i>Vhl<sup>jae.KO/pjr.fl</sup></i> or <i>Vhl<sup>wt/pjr.fl</sup> Pax8-CreERT2</i> mice given 5 × 2 mg tamoxifen and harvested at the early time point (<i>n</i> = 3 per genotype).</p>