The fetus is thought to be protected from exposure to foreign antigens, yet CD45RO+ T cells reside in the fetal intestine. Here we combined functional assays with mass cytometry, single-cell RNA sequencing and high-throughput T cell antigen receptor (TCR) sequencing to characterize the CD4+ T cell compartment in the human fetal intestine. We identified 22 CD4+ T cell clusters, including naive-like, regulatory-like and memory-like subpopulations, which were confirmed and further characterized at the transcriptional level. Memory-like CD4+ T cells had high expression of Ki-67, indicative of cell division, and CD5, a surrogate marker of TCR avidity, and produced the cytokines IFN-γ and IL-2. Pathway analysis revealed a differentiation trajectory associated with cellular activation and proinflammatory effector functions, and TCR repertoire analysis indicated clonal expansions, distinct repertoire characteristics and interconnections between subpopulations of memory-like CD4+ T cells. Imaging mass cytometry indicated that memory-like CD4+ T cells colocalized with antigen-presenting cells. Collectively, these results provide evidence for the generation of memory-like CD4+ T cells in the human fetal intestine that is consistent with exposure to foreign antigens.
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Mass cytometry data are available via Flow Repository (https://flowrepository.org/id/FR-FCM-ZYRD). Single-cell RNA-seq data are available via Gene Expression Omnibus accession code GSE122846. The remaining data that support the findings of this study are available from the corresponding author upon reasonable request.
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We thank the Center for Contraception, Abortion and Sexuality (Leiden and The Hague) for collection and provision of fetal material, K. Lodder, T. van Herwaarden, M. Bialecka and F. Wang for dissection of fetal tissues, and S. L. Kloet for assistance with single-cell RNA sequencing. This research was supported by Leiden University Medical Center (N.L., V.v.U., N.G., F.K.), the Netherlands Organization for Scientific Research (NWO Applied Technical Sciences grant no. 12721 and ZonMW grant no. 91112008) (T.A., T.H., J.E., B.P.F.L.), the Russian Science Foundation (grant no. 16-15-00149) (S.A.K., E.S.E., M.I., O.V.B, D.M.C.), the Wellcome Trust (grant no. 100326/Z/12/Z) (K.L., J.E.M., D.A.P), the European Commission under an MSCA-ITN award (grant no. 675743/ISPIC) (T.A.), and the China Scholarship Council (N.L. and N.G.).
Integrated supplementary information
(a) Biaxial plots from one fetal intestine showing the gating strategy for single, live, CD45+ cells analyzed by mass cytometry (n = 7). (b) First-level HSNE embedding of CD45+ immune cells (n = 224,286) derived from fetal intestines (n = 7). Each dot represents a landmark. The size of each landmark is proportional to the number of cells that the landmark represents. Colors indicate ArcSinh5-transformed expression values. (c) t-SNE embedding showing all CD4+ T cells (n = 110,332) derived from fetal intestines (n = 7). Colors indicate the ArcSinh5-transformed expression values.
Supplementary Figure 2 Mass cytometric analysis of the fetal CD4+ T cell compartment across tissues.
(a) t-SNE embedding of all CD4+ T cells (n = 9.7 × 104) derived from fetal intestines (n = 6.6 × 104 cells from 7 samples), fetal livers (n = 1,530 cells from 3 samples), and fetal spleens (n = 3.0 × 104 cells from 3 samples). Colors indicate tissue origin. Downsampling was performed for samples with more than 10,000 CD4+ T cells. (b) Bar graphs showing the quantification of Treg cells and TN cells, TCM cells, and TEM cells among fetal CD4+ T cells across tissues. TN cells: CD45RA+CCR7+; TCM cells: CD45RA-CCR7+; TEM cells: CD45RA-CCR7−. Fetal liver and spleen, n = 3 independent samples; fetal intestine, n = 7 independent samples. Error bars indicate mean ± SEM. **p < 0.01, Kruskal–Wallis test with Dunn’s test for multiple comparisons.
(a) Representative biaxial plots showing the gating strategy for TN, CD161− TM, CD161+CD117− TM, CD161+CD117+ TM and Treg cell clusters derived from one fetal intestine analyzed by flow cytometry for expression of CD3, CD4, CD8a, CD25, CD45RA, CD45RO, CD117, CD127, CD161 and TCRγδ (n = 10). (b) Expression (log-normalized) of KIT as determined by single-cell RNA-seq analysis, presented as violin plots. Colors indicate different cell clusters. (c) Bar plot depicting cell frequencies for clusters identified by mass cytometry and RNA-seq.
(a-b) t-SNE embeddings of all fetal intestinal CD4+ T cells analyzed in (a) the mass cytometry dataset (n = 10,436 cells, 35 proteins) and (b) the RNA-seq dataset (n = 1,743 cells, 300 variable genes) at the middle of the t-SNE computation. Colors indicate marker expression. (c) Diffusion map and (d) VorteX analysis of all fetal intestinal CD4+ T cells analyzed in mass cytometry dataset (n = 10,436 cells, 35 proteins). Colors indicate different cell clusters. (e) Diffusion map and (f) PCA analysis of all fetal intestinal CD4+ T cells analyzed in the RNA-seq dataset (n = 1,743 cells, 2,174 variable genes). Colors indicate different cell clusters.
(a) Table listing 106 immune-related genes kinetically enriched in the pseudotime-dependent third gene module (Fig. 4d). (b) Interaction network of the pseudotime-dependent third gene module using Esyn. Orange lines indicate literature-described physical interactions of the gene-encoded proteins. Orange nodes indicate genes enriched in immunological processes.
(a) Dot plot showing the percentage of reads per unique TCRβ sequence in each cluster. Number of unique TCRβ sequences per cluster: TN cells, 59; CD161- TM cells, 54; CD161+CD117- TM cells, 37; CD161+CD117+ TM cells, 51; Naive Treg cells, 29; Memory Treg cells, 50. (b) Hierarchical clustering of CD4+ T subpopulations based on individual V-J rearrangements in the TCRα (TRA) and TCRβ (TRB) datasets. Colors indicate different fetal intestines. (c) Dot plot showing weighted clonal overlaps for TCRβ amino acid sequences among clusters from two different fetal intestines analyzed using the F2 similarity metric in VDJtools. (d) Chord diagram showing clonal overlaps among different cell clusters. Numbers in the yellow circle indicate the total numbers and frequencies (parentheses) of private TCRβ clonotypes among TN cells. Numbers outside the plot border indicate the total numbers and frequencies (parentheses) of unique TCRβ clonotypes shared among TN cells and other CD4+ T cell subpopulations. (a) Conventional sequencing, (b-d) high-throughput sequencing.
(a-c) Purified fetal intestinal CD4+ T cells were treated with a control antibody or stimulated with anti-CD3 and anti-CD28 for 4 h. Intracellular expression of TNF, IFN-γ, IL-2, IL-4 and Ki-67 was determined for each subpopulation by flow cytometry. (a) Dot plot showing the median fluorescence intensity (MFI) of TNF for each cell cluster relative to corresponding CD117+ TM subpopulation in each fetal intestine (n = 4) after stimulation with anti-CD3 and anti-CD28. Data represent two independent experiments. (b) Representative biaxial plots showing coexpression of cytokines vs. Ki-67 for the indicated cell clusters after stimulation with anti-CD3 and anti-CD28. (c) Pie charts depicting coexpression profiles of IFN-γ and IL-2 for the indicated cell clusters from fetal intestines (n = 2) after stimulation with anti-CD3 and anti-CD28. Data represent two independent experiments.
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Nature Immunology (2019)