Phosphatase and tensin homologue (PTEN) is frequently mutated in human cancer, but its roles in lymphopoiesis and tissue homeostasis remain poorly defined. Here we show that PTEN orchestrates a two-step developmental process linking antigen receptor and IL-23–Stat3 signalling to type-17 innate-like T cell generation. Loss of PTEN leads to pronounced accumulation of mature IL-17-producing innate-like T cells in the thymus. IL-23 is essential for their accumulation, and ablation of IL-23 or IL-17 signalling rectifies the reduced survival of female PTEN-haploinsufficient mice that model human patients with PTEN mutations. Single-cell transcriptome and network analyses revealed the dynamic regulation of PTEN, mTOR and metabolic activities that accompanied type-17 cell programming. Furthermore, deletion of mTORC1 or mTORC2 blocks PTEN loss-driven type-17 cell accumulation, and this is further shaped by the Foxo1 and Stat3 pathways. Collectively, our study establishes developmental and metabolic signalling networks underpinning type-17 cell fate decisions and their functional effects at coordinating PTEN-dependent tissue homeostasis.
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The authors declare that the data supporting the findings of this study are available within the paper and its Supplementary Information. All microarray, scRNA-seq and single-cell TCR-sequencing data described in the manuscript have been deposited in the NCBI GEO database and are accessible through the GEO SuperSeries accession number GSE179512. Public data analysed in this manuscript are also available under the GEO accession codes GSE27241 (ref. 22), GSE15907 (ref. 37) and GSE137350 (ref. 56), or the European Bioinformatics Institute (EMBL-EBI) accession codes E-MTAB-7702 (ref. 38) and E-MTAB-7704 (ref. 38). Publicly available databases used in this study are available at the indicated locations: mSigDB Collections (for Hallmark, CP: Canonical, C5: GO:BP and C7: Immunological databases), http://www.gsea-msigdb.org/gsea/msigdb/collections.jsp; human transcription-factor database, http://humantfs.ccbr.utoronto.ca/; transcription regulator activity database GO:0140110; and mm10 from ENSEMBL GRCm38, https://www.ncbi.nlm.nih.gov/data-hub/genome/GCF_000001635.20/. Source data are provided with this paper. All other data supporting the findings of this study are available from the corresponding authors on reasonable request.
Custom R scripts used for the analysis of bulk TCR repertoire data were generated by the authors S.S. and P.G.T. and are available on request.
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The authors acknowledge X. Du and Y. Wang for critical reading or editing of the manuscript, M. Hendren and R. Walton for animal colony maintenance and technical assistance, and the St. Jude Immunology FACS core facility for cell sorting. This work was supported by ALSAC and National Institutes of Health grant nos AI105887, AI131703, AI140761, AI150241, AI150514 and CA253188 (to H.C.), and AI136514 and AI150747 (to P.G.T.). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
H.C. is a consultant for Kumquat Biosciences, Inc. P.G.T. is on the scientific advisory board of Immunoscape and Cytoagents, and has consulted for or received personal fees from Mirror Biologics, PACT Pharma, Johnson & Johnson, Pfizer, 10X Genomics, Illumina and Elevate Bio, and has a sponsored research agreement with Elevate Bio. The remaining authors declare no competing interests.
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Extended Data Fig. 1 Characterization of thymic and peripheral IL-17-producing populations in Cd4CrePtenfl/fl mice.
(a) Flow cytometry analysis and quantification of percentages and numbers of CD4–CD8– double-negative (DN), CD4+CD8+ double-positive (DP), CD4+ single-positive (CD4SP), and CD8+ SP (CD8SP) thymocytes in 3–6 week-old WT and Cd4CrePtenfl/fl mice (n = 8 mice per group). (b) Quantification of numbers of IFNγ- and IL-4-producing TCRβ+ cells in the thymus from WT and Cd4CrePtenfl/fl mice (n = 12 mice per group for IFNγ+TCRβ+; 6 mice per group for IL-4+TCRb+). (c) Quantification of IL-17A+TCRβ+ cell number in spleen, peripheral lymph nodes (pLN), lung, and liver (n = 6 mice per group for spleen and pLN; 3 mice per group for lung and liver). (d) Flow cytometry analysis of CCR6 and CD127 expression on IL-17A+TCRβ+ thymocytes in WT and Cd4CrePtenfl/fl mice. (e) Flow cytometry analyses of CCR6 versus RORγtGFP expression and CCR6+CD127+ cells among CCR6+RORgtGFP+ thymocytes in Cd4CrePten+/+RORγtGFP and Cd4CrePtenfl/flRORγtGFP mice. Right: quantification of the number of RORgtGFP+CCR6+ thymocytes in Cd4CrePten+/+RORγtGFP and Cd4CrePtenfl/flRORγtGFP mice (n = 3 mice per group). (f) Quantification of numbers of IL-17A+TCRβ+ and CCR6+CD127+TCRβ+ thymocytes in 10–15-day-old WT and Cd4CrePtenfl/fl mice (n = 10 mice per group). (g) Relative Pten mRNA expression in pre-selection and post-selection DP cells from thymus of WT and Cd4CrePtenfl/fl mice (n = 5 mice per group for TCRβ–CD69– DP cells; 5 WT and 4 Cd4CrePtenfl/fl mice for TCRβ+CD69+ DP cells). (h) Relative Pten mRNA expression in WT pre-selection DP cells stimulated with anti-CD3/CD28 antibodies for 4 h (n = 5 mice per group). (i) Violin plots showing expression of Pten, Rorc, and Il23r in indicated thymocyte populations from WT mice (n = 2 mice). Data are representative of at least two (d,e; flow cytometry panels), or combined from five (a), at least four (b; c, spleen and pLN), three (c, lung and liver), or two (e–h) independent experiments. Two-tailed unpaired Student’s t-test (a,b,e–h). Data are shown as mean ± s.e.m. (a–c,e–h). *P < 0.05; **P < 0.01; ***P < 0.001; ns, not significant. Numbers indicate percentages of cells in gates (a,d,e).
Extended Data Fig. 2 Dispensable role of IL-6 for the generation and thymic-resident features of PTEN-deficient IL-17-producing cells.
(a) Quantification of percentages and numbers of IL-17A+TCRβ+ and CCR6+CD127+TCRβ+ thymocytes (n = 7 WT, 7 Cd4CrePtenfl/fl, 4 Il6–/–, and 8 Cd4CrePtenfl/flIl6–/– mice for frequencies; 6 WT, 6 Cd4CrePtenfl/fl, 2 Il6–/– and 6 Cd4CrePtenfl/flIl6–/– for numbers). (b) Relative number of IL-17A+TCRβ+ thymocytes in indicated 4–6-week-old mice (values were set to WT equal to 1 for normalization) (n = 11 WT, 8 Cd4CrePten+/fl, and 9 Cd4CrePtenfl/fl mice). (c) Percentages of IL-17A+TCRβ+ thymocytes and IL-17A+CD4+Foxp3–CD44+ effector/memory T cells in the spleen and mesenteric lymph nodes (mLN) of 5–9-month-old WT and Cd4CrePtenfl/fl mice (n = 8 mice per group for thymus and spleen; 6 mice per group for mLN). (d) Relative number of IL-17A+TCRβ+ thymocytes (n = 5 mice per group for ≤ 20-week-old male mice; 10 mice per group for ≤ 20-week-old female mice and > 20-week-old female mice; 2 mice per group for > 20-week-old male mice). (e,f) Survival curves of male and female WT, Cd4CrePtenfl/fl, and Cd4CrePtenfl/flIl17ra–/– (e; n = 18–111 mice per group; see legend key for details), or male and female WT, Cd4CrePtenfl/fl, and Cd4CrePtenfl/flIl23a–/– mice (f; n = 48–111 mice per group; see legend key for details). WT and Cd4CrePtenfl/fl mice were the same in e and f. (g) Relative number of IL-17A-GFP+TCRβ+ cells (n = 3 mice per group for spleen, peripheral lymph nodes (pLN), and lung; 2 mice per group for liver). (h) Flow cytometry analysis of S1PR1, CD62L, CD69, and CD103 expression. Data are representative of at least three (h), or combined from four (a), at least six (b,d), three (c, thymus and spleen), or two (c, mLN; g) independent experiments. Two-tailed unpaired Student’s t-test (c,d) or log-rank test (e,f). Data are shown as mean ± s.e.m. (a–d,g). *P < 0.05; **P < 0.01; ns, not significant. Numbers indicate mean fluorescence intensity (h).
Extended Data Fig. 3 Cellular and molecular characterization of PTEN-deficient IL-17-producing thymocytes.
(a) Flow cytometry analysis and quantification of percentages of TCRβ+ or TCRγδ+CCR6+CD127+ thymocytes (n = 7 mice per group). (b) Flow cytometry analysis and quantification of percentage of CD3ε+CCR6+CD127+TCRβ+ thymocytes (n = 7 mice per group). (c) Flow cytometry analysis and quantification of relative TCRβ mean fluorescence intensity (MFI) on the indicated thymocyte population from Cd4CrePtenfl/fl mice (n = 3 mice). (d) Flow cytometry analysis of CD1d:PBS57 tetramer staining on IL-17A+TCRβ+ thymocytes. (e) Flow cytometry analysis of IL-17A production among CD44+ thymocytes. (f) Flow cytometry analysis of CD1d:PBS57- and MR1:5-OP-RU-tetramer co-staining on CCR6+CD127+TCRβ+ or IL-17A+TCRβ+ thymocytes (blue, iNKT17; purple, MAIT17; orange, iNKT17–MAIT17–). (g,h) Enrichment plots showing activity of PTEN gene signature (see Supplementary Table 31) in WT iNKT (g) or WT MAIT (h) compared to CD4SP or CD8SP cells from public microarray datasets37,38. PTEN KO, Cd4CrePtenfl/fl; NES, normalized enrichment score; FDR, false discovery rate. (i) Flow cytometry analysis and quantification of MAIT cell number (n = 9 WT and 10 Cd4CrePtenfl/fl mice). (j) Quantification of percentages and numbers of RORγt+ and T-bet+ MAIT cells (pregated on total MAIT cells) (n = 7 mice per group). (k) Flow cytometry analysis and quantification of percentages of active caspase-3+ thymic iNKT and MAIT cells (n = 5 mice per group). (l) Quantification of percentages of bromodeoxyuridine (BrdU)+ thymic iNKT and MAIT cells (n = 3 mice per group for iNKT cells; 2 mice per group for MAIT cells). (m) Quantification of percentages of Ki67+ iNKT1 (CD1d:PBS57-tetramer+T-bet+PLZFlo) and iNKT2 (CD1d:PBS57-tetramer+PLZFhiRORγt–) cells (n = 6 mice per group). Data are representative of at least six (d), two (e), or five (f), or combined from four (a,i,m), six (b,j), three (c), five (k), or two (l) independent experiments. Two-tailed unpaired Student’s t-test (b,c,i–m). Data are shown as mean ± s.e.m. (a–c,i–m). *P < 0.05; **P < 0.01; ***P < 0.001; ns, not significant. Numbers indicate MFI (c) or percentages of cells in gates or quadrants (d–f,j,k).
Extended Data Fig. 4 TCR repertoire, surface molecule, and transcriptome analyses of PTEN-deficient iNKT17−MAIT17− thymocytes.
(a) Shannon or Inverse Simpson’s diversity scores of TCR repertoires of indicated cell populations among CCR6+CD127+TCRβ+ thymocytes from Cd4CrePtenfl/fl mice (n = 3 mice). (b) Inverse Simpson’s diversity scores of the TCRα and TCRβ repertoires of sort-purified iNKT17, MAIT17, and iNKT17–MAIT17– cells among CCR6+CD127+TCRβ+ thymocytes from Cd4CrePtenfl/fl mice. Each dot corresponds to an individual mouse (n = 4 mice). (c) Relative frequency of TCRα and TCRβ clones in sort-purified iNKT17, MAIT17, and iNKT17–MAIT17–cells among CCR6+CD127+TCRβ+ thymocytes from Cd4CrePtenfl/fl mice (n = 4 mice). FDR, false discovery rate. (d) Plot depicting differential expression profiles (|log2 FC| > 0.5, FDR < 0.05) in each indicated comparison. Red and blue numbers indicate the numbers of upregulated and downregulated genes in each comparison, respectively. Cells were profiled by scRNA-seq and identified as in Fig. 3e (n = 4 WT and 3 Cd4CrePtenfl/fl mice). (e) Functional enrichment analysis of the differentially expressed (|log2 FC| > 0.5, FDR < 0.05) genes in PTEN-deficient versus WT iNKT17–MAIT17– cells (n = 4 WT and 3 Cd4CrePtenfl/fl mice). (f) Flow cytometry analysis and quantification of the numbers of CD4–CD8– double-negative (DN), CD4+CD8+ double-positive (DP), CD4+ single-positive (CD4SP), and CD8+ SP (CD8SP) cells among the iNKT17–MAIT17– thymocytes (pre-gated on CCR6+CD127+TCRβ+ cells) (n = 9 WT or 10 Cd4CrePtenfl/fl mice). (g) Flow cytometry analysis and quantification of percentages and numbers of PD-1– and PD-1+ cells among the CD4–CD8–iNKT17–MAIT17– thymocytes (pre-gated on CCR6+CD127+TCRβ+ cells) (n = 4 WT or 5 Cd4CrePtenfl/fl mice). Data are combined from two (d), five (f) or three (g) independent experiments. Two-tailed paired Student’s t-test followed by Benjamin–Hochberg method (c; depicted for hyperexpanded TCR clonotypes), right-tailed Fisher’s exact test, (e) or two-tailed unpaired Student’s t-test (f,g). Data are shown as mean ± s.e.m. (f,g). Box plots (d): Box shows median with interquartile range (IQR) of 25% (minima)–75% (maxima); whiskers show 25% quantile ± IQR. **P < 0.01; ***P < 0.001; ns, not significant. Numbers indicate percentages of cells in gates (f,g).
Extended Data Fig. 5 Metabolic signatures of type-17 innate-like T cell subsets.
(a) Flow cytometry analysis and quantification of TMRM and MitoTracker Deep Red staining of CCR6+CD127+TCRβ+ thymocytes (n = 6 per group for TMRM; 6 WT and 5 Cd4CrePtenfl/fl for MitoTracker Deep Red). Data are relative to the average TMRM or MitoTracker Deep Red mean fluorescence intensity (MFI) in CCR6+CD127+TCRβ+ thymocytes from WT mice. (b) Metabolic signature scores of single cell transcriptomes of PTEN-deficient iNKT17, MAIT17, and iNKT17–MAIT17– cells as compared with WT. Cells were profiled by scRNA-seq and identified as in Fig. 3e. Alignment to the left of the dashed line indicates enrichment in PTEN-deficient cells; alignment to the right of the dashed line indicates enrichment in WT cells (n = 3 WT and 4 Cd4CrePtenfl/fl mice). (c) Quantification of numbers of IL-17A+TCRβ+ and CCR6+CD127+TCRβ+ thymocytes in WT and Cd4CrePtenfl/fl mice treated with rapamycin or vehicle (n = 4 WT + vehicle, 4 Cd4CrePtenfl/fl + vehicle, 3 WT + rapamycin, and 4 Cd4CrePtenfl/fl + rapamycin mice for IL-17A+TCRβ+ thymocytes; 4 mice per group for CCR6+CD127+TCRβ+ thymocytes). (d) GSEA of Hallmark pathways upregulated (red) or downregulated (blue) in pre-selection DP cells from Cd4CrePtenfl/fl (PTEN KO) versus WT mice; Cd4CrePtenfl/flRptorfl/fl (PTEN/RAPTOR dKO) versus PTEN KO mice; and Cd4CrePtenfl/flRictorfl/fl (PTEN/RICTOR dKO) versus PTEN KO mice. NES, normalized enrichment score; FDR, false discovery rate. (e,f) Quantification of MitoTracker Deep Red staining of CCR6+CD127+TCRβ+ thymocytes from the indicated mice (e; n = 7 WT, 7 Cd4CrePtenfl/fl, 3 Cd4CreRptorfl/fl and 10 Cd4CrePtenfl/flRptorfl/fl mice; f; n = 11 WT, 8 Cd4CrePtenfl/fl, 2 Cd4CreRictorfl/fl, and 9 Cd4CrePtenfl/flRictorfl/fl mice). (g) Heatmap depicting the expression of Rorc and Il23r in post-selection DP cells from indicated mice (n = 4 WT, 5 Cd4CrePtenfl/fl, 7 Cd4CrePtenfl/flRptorfl/fl and 5 Cd4CrePtenfl/flRictorfl/fl mice). Data are combined from four (a, TMRM; e), three (a, MitoTracker Deep Red), two (c), or five (f) independent experiments. Two-tailed unpaired Student’s t-test (a) or one-way ANOVA with Tukey’s test (c,e,f). Data are shown as mean ± s.e.m. (a,c,e,f). ***P < 0.001. Numbers indicate MFI (a).
Extended Data Fig. 6 Roles of Foxo1, Stat3 and IL-23 signalling in type-17 innate-like T cell development.
(a) Flow cytometry analysis and quantification of percentage and number of CCR6+CD127+TCRβ+ thymocytes. Lower: flow cytometry analysis and quantification of the relative numbers of indicated subsets among CCR6+CD127+TCRβ+ thymocytes (n = 5 mice per group). (b) Quantification of TMRM and MitoTracker Deep Red staining of CCR6+CD127+TCRβ+ thymocytes (n = 6 WT and 10 Cd4CreFoxo1fl/fl mice). (c) Quantification of percentages of indicated populations among CCR6+CD127+TCRβ+ thymocytes (n = 7 WT and 8 Il23a–/– mice). (d) Quantification of percentages of indicated thymic iNKT subsets (n = 3 WT and 4 Il23a–/– mice for RORγt+PLZFint iNKT17, T-bet+PLZFlo iNKT1, PLZFhiRORγt– iNKT2 and IL-4+ iNKT2; 5 WT and 6 Il23a–/– mice for IL-17A+ iNKT17; and 4 WT and 5 Il23a–/– mice for IFNγ+ iNKT1). (e) PTEN orchestrates a two-step thymic programme to regulate the development of type-17 innate-like T cells downstream of TCR and IL-23–IL-23R–Stat3 signalling. Upper: In pre-positive selection DP cells, TCR signals initiate positive selection and downregulate PTEN expression. In post-positive selection DP cells, PTEN restrains RORγt-dependent induction of the type-17 programme that induces IL-23R expression, and restrains Foxo1 activity that inhibits IL-23R expression. Sustained downregulation of PTEN expression at this stage allows for induction of IL-23R expression and IL-23–IL-23R–Stat3 signalling, which promotes the development of type-17 innate-like T cell subsets. Lower left, PTEN inhibits mTOR signalling to restrain metabolic activities and expression of RORγt and IL-23R in DP cells. Lower right, hyperactivation of IL-17RA and IL-23 signalling contributes to the fatality of mice with PTEN haploinsufficiency, a model of human PTEN Hamartoma Tumour Syndrome (PHTS). Data are combined from two (a,b), one (d, transcription factors and IL-4+ iNKT2 cells), four (c), or three (d, IL-17A+ iNKT17 and IFNγ+ iNKT1 cells) independent experiments. Two-tailed unpaired Student’s t-test (a–d). Data are shown as mean ± s.e.m. (a–d). *P < 0.05; **P < 0.01; ***P < 0.001; ns, not significant. Numbers indicate percentage of cells in gates or quadrants (a).
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Blanco, D.B., Chapman, N.M., Raynor, J.L. et al. PTEN directs developmental and metabolic signaling for innate-like T cell fate and tissue homeostasis. Nat Cell Biol 24, 1642–1654 (2022). https://doi.org/10.1038/s41556-022-01011-w
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