Pyruvate dehydrogenase (PDH) is the gatekeeper enzyme of the tricarboxylic acid (TCA) cycle. Here we show that the deglycase DJ-1 (encoded by PARK7, a key familial Parkinson’s disease gene) is a pacemaker regulating PDH activity in CD4+ regulatory T cells (Treg cells). DJ-1 binds to PDHE1-β (PDHB), inhibiting phosphorylation of PDHE1-α (PDHA), thus promoting PDH activity and oxidative phosphorylation (OXPHOS). Park7 (Dj-1) deletion impairs Treg survival starting in young mice and reduces Treg homeostatic proliferation and cellularity only in aged mice. This leads to increased severity in aged mice during the remission of experimental autoimmune encephalomyelitis (EAE). Dj-1 deletion also compromises differentiation of inducible Treg cells especially in aged mice, and the impairment occurs via regulation of PDHB. These findings provide unforeseen insight into the complicated regulatory machinery of the PDH complex. As Treg homeostasis is dysregulated in many complex diseases, the DJ-1–PDHB axis represents a potential target to maintain or re-establish Treg homeostasis.
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The microarray data have been deposited in the NCBI Gene Expression Omnibus under the accession number GSE115269. The proteomic mass spectrometry data (https://doi.org/doi:10.25345/C5437F) of the co-IP analysis have been deposited in ProteomeXchange via MassIVE under the identifier PXD016610. Source data are provided with this paper.
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This work was supported by the Luxembourg National Research Fund (FNR) CORE programme (CORE/14/BM/8231540/GeDES), the Luxembourg–RIKEN bilateral programme ‘TregBar’, ‘NEXTIMMUNE’ (PRIDE/11012546) and ‘CRiTiCS’ DTU (to F.Q.H.); individual Aide à la Formation Recherche grants to E.D. (PHD-2014-1/7603621) and N.Z. (PHD-2015-1/9989160); and other PhD position grants to C.M.C. (PRIDE/2015/10907093) and D.G.F. (through the Luxembourg–RIKEN bilateral programme (2015/11228353, ‘TregBar’)) through the group of F.Q.H. The work was also supported by the DFG (grant WU 164/5-1) to W.W. and by the German Federal Ministry of Education and Research (BMBF) through the Integrated Network MitoPD (grant 031A430E to W.W. and D.M.V.W.). J.M. is supported by FNR ATTRACT (A18/BM/11809970). D.B. is supported by FNR ATTRACT (A14/BM/7632103) and FNR CORE grants (C21/BM/15796788 and C18/BM/12691266). R.K. is supported by the FNR NCER-PD and PEARL programme (FNR/P13/6682797). We also thank the Luxembourg Centre for Systems Biomedicine Metabolomics Platform for providing technical and analytical support and acknowledge the EMBL Genomics Core Facility (Heidelberg, V. Benes) for their microarray analysis. We thank A. Daujeumont, N. Ouzren, T. Li, O. Boyd, N. Bonjean, C. Davril, S. Köglsberger, J. Walter, X. Dong, S. Badeke and F. Fack for their expert technical support. We acknowledge M.P. Dufresne (Liege, Belgium) for allowing us to access their irradiator and N. Malvaus from the Luxembourg Red Cross for providing buffy coats and leukopaks.
F.Q.H., R.B. and E.D. once filed a patent on some of the related data.
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Extended Data Fig. 1 DJ-1 is highly expressed in human Tregs and connected with well-known Treg genes in Treg specific-correlation network.
a, Mean transcription expression of the known PD genes measured in the first 6hrs of anti-CD3-/-CD28/IL-2 stimulation assessed by our published high-time-resolution (an interval of 20min) time-series transcriptome (with 19 time points)23. Treg1 and Treg2 (or Teff1 and Teff2) represent two independently repeated HTR time-series experiments for Tregs (or Teffs). DJ-1 is highlighted by red rectangle. b, PARK7/DJ-1 subnetwork extracted from the constructed human Treg-specific correlation network. Each oval represents one gene. A selection of known key Treg genes were highlighted in red. Each line between DJ-1 and the other genes represents a correlation-based functional linkage.
a, Characterization of highly purified human nTregs (CD4+CD25highCD127low). Representative FCM plots of FOXP3, CD127, Helios, and CD25 on human Tregs relative Teffs (all the markers were not stained in the same panel). ‘TregThu’ is a golden standard of isolated human Tregs50. The protein expression of LRRC32 (GARP) was measured after 3-day stimulation by irradiated EBV-transformed B cells. b, Representative ImageStream plot of GZMB expression in unstimulated Tregs or Teffs. c, Representative In-vitro proliferation assay of human Teffs suppressed by human Tregs at different ratios, in co-culture with irradiated EBV-B cells for 5 days. Only living CD4 T cells were gated for analysis. Results represent 7-10 (a-c) independent experiments (from different heathy donors).
a, b, In-vitro suppression assay of Dj-1-/- or Dj-1+/+ Tregs isolated from aged (a) or young (b) mice in co-culture with Tconv and irradiated feeder cells in the presence of anti-CD3 for 3.5 days. Percentages of dividing cells from the total population (the total population indicates the gated DAPI-negative and CD4+, CFSE-labelled Tconv) are presented on the plots. c, Frequency of CTLA4-expressing cells among CD4+FOXP3+ Treg cells (left) and Geometric mean (Geo mean, MFI) of CTLA4 among CD4+FOXP3+ Tregs from spleen (Sp) and lymph nodes (LN) from Dj-1-/- and Dj-1+/+ WT littermates [for the frequency, n=that in d and e; for CTLA4 MFI measurement in aged mice (aged KO, n=3; WT, n=5 sp; KO, n=3 LN; WT, n=4 LN; of note, for comparability, the CTLA4 MFI results were not pooled from different batches; for CTLA4 MFI measurement in young mice, n=that in d and e]. *P=0.0500. d, e, Geometric mean (MFI) of FOXP3 (d) or CD25 (e) expression among CD4+FOXP3+ Tregs. Young or aged murine results are marked in each panel (young KO, n=5; young WT, n=5; aged KO, n=8; aged WT, n=6; aged data pooled from 2 independent experiments). **P=0.00581 (d); **P=0.00654 and **P=0.00946 (e). Results represent three (a, b) and four (c, d, e) independent experiments. Data are mean ± s.d. P values are determined by two-tailed Student’s t-test. ns, not significant, *P<=0.05, **P<=0.01 and ***P<=0.001.
Extended Data Fig. 4 BM models show that Treg cellularity is also regulated in a hematopoietic-extrinsic and host micro-environmental aging-dependent manner.
a, Gating strategy used to identify FOXP3+ cells among CD4 T cells developed from CD45.1 Dj-1 WT- and CD45.2 Dj-1 KO-origin cells in bone marrow (BM) chimeras. b, Percentages of FOXP3+ cells among living CD4+ cells originated from CD45.1 or CD45.2 BM cells transplanted from young donors (left panel, n=5). Representative histogram overlay of FOXP3 expression among living CD4 T cells derived from CD45.2 Dj-1 KO or CD45.1 Dj-1 WT BM cells (right panel). **P=0.00131. c, Percentages of FOXP3+ cells among living CD4+ cells originated from CD45.1 Dj-1 WT or CD45.2 Dj-1 KO BM cells transplanted from aged donors and reconstituted in young Dj-1 KO (n=4) or WT recipients (n=5). **P=0.00113 and ***P=0.000106. Results represent two (b, c) independent experiments. Data are mean ± s.d. P values are determined by paired two-tailed Student’s t-test. ns, not significant, *P<=0.05, **P<=0.01 and ***P<=0.001.
a, mRNA expression of Park7/Dj-1 is highly correlated with Pdhb only in murine Tregs but not in other analyzed CD4 T-cell subsets. 1416526_a_at and 1416090_at are the probeset IDs measuring Park7 and Pdhb in Affymetric microarrays, respectively. The number (n) of microarray samples used for correlation analysis is 240, 51, 35 and 47 from CD4 Tregs, Th1, Th2 and Tmem (memory CD4 T cells), respectively. The R value corresponds to Pearson correlation coefficient and the associated P-value is from two-tailed test (Prism). Ns, non-significant and otherwise, P value is provided for the corresponding cell type. For the details, refer to the database (from Sakaguchi’s lab): https://sysimm.ifrec.osaka-u.ac.jp/immuno-navigator/?o=10090&probe1=1416526_a_at&probe2=1416090_at&cell=5.
Extended Data Fig. 6 Expression analysis of the genes encoding PDH complex and the PDH regulatory machinery in nTregs of aged mice.
a, mRNA expression of the genes (Pdks) encoding PDH kinases and the genes (Pdps) encoding pyruvate dehydrogenase phosphatases in Tregs freshly isolated from aged Dj-1 KO and age- and gender-matched WT littermates (n=3/group). **P=0.00420, *P=0.0348, and *P=0.0362. b, mRNA expression of the genes encoding several PDH complex subunits in Tregs freshly isolated from aged Dj-1 KO and WT littermates. Results are the summary of the microarray datasets (from 3 mice each group). Data are mean± s.d. P values are determined by two-tailed Student’s t-test. ns or unlabeled, not significant, *P<=0.05, **P<=0.01 and ***P<=0.001.
a, b, c, Cell proliferation [as labelled by CTV] (a), cell survival as measured by live/dead staining among CD4+ cells (b) or histogram overlay of FOXP3 expression (c) in isolated nTregs stimulated for three days treated with the indicated concentration of a PDH inhibitor (CPI-613) or control vehicle or without stimulation (gray). Results represent at least three independent experiments.
a, upper panel: Methylation analysis of isolated naïve CD4+ T cells (CD4 Tn) from DJ-1 KO or WT mice for Foxp3 TSDR (Regulatory T-Cell-Specific Demethylated Region). Individual values for CpG positions 6-12 are shown as individual data points. lower panel: Heatmap displays mean methylation per CpG position in 5% intervals. **P=0.0095 and ***P=3.2E-05. b, upper panel: Methylation analysis of isolated CD4 Tn from DJ-1 KO or WT mice for the Foxp3 promoter region. Individual values for CpG positions 1-5 are shown as individual data points. Lower panel: Heatmap displays mean methylation per CpG position in 10% intervals. Results represent 2-4 independent experiments (young KO n= 7; young WT n= 7; aged KO n= 2; aged WT n= 4; all males). Boxplots show 25th and 75th percentiles around the median. Whiskers correspond to 1.5× IQR (interquantile range). Horizontal bars show Holm-adjusted P values after two-sided Wilcox test. Of note, since Foxp3 is an X-linked gene, to avoid observing x-inactivation-related methylation alteration, we focused on males here.
Extended Data Fig. 9 PDH inhibition also compromises iTreg differentiation in naïve CD4 T cells isolated from aged mice.
a, Representative FCM plots of FOXP3 expression among living CD4 T cells differentiated from naïve CD4 T cells (CD4 Tn) treated with different doses of CPI-613 or control vehicle without (upper panel) or with 10U/ml of recombinant IL-2 (lower panel). The CD4 Tn were isolated from very old DJ-1 WT mice (~105-wk-old). b, Percentages of FOXP3+ cells (left panel) or Ki67+ cells (right panel) among living CD4 T cells following iTreg differentiation with different doses of CPI-613 or control vehicles with or without exogenous IL-2 for three days (n=3 mice). Middle panel, Percentages of living cells among total CD4 T cells following iTreg differentiation. Of note, a PE instead of APC fluorochrome (the latter was used in other experiments) was used to analyze FOXP3 expression in the experiments of this figure. *P=0.0387, **P=0.00157 and ***P=0.000845 (left panel); *P=0.0206, *P=0.0130 and **P=0.00130 (middle panel); *P=0.0183 and **P=0.00312 (right panel). Results represent two (a, b) independent experiments. Data are mean ± s.d. P values are determined by two-tailed Student’s t-test. ns, not significant, *P<=0.05, **P<=0.01 and ***P<=0.001.
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Danileviciute, E., Zeng, N., Capelle, C.M. et al. PARK7/DJ-1 promotes pyruvate dehydrogenase activity and maintains Treg homeostasis during ageing. Nat Metab 4, 589–607 (2022). https://doi.org/10.1038/s42255-022-00576-y