Pancreatic ductal adenocarcinoma (PDA) is characterized by an immune-suppressive tumor microenvironment that renders it largely refractory to immunotherapy. We implemented a multimodal analysis approach to elucidate the immune landscape in PDA. Using a combination of CyTOF, single-cell RNA sequencing and multiplex immunohistochemistry on patient tumors, matched blood and non-malignant samples, we uncovered a complex network of immune-suppressive cellular interactions. These experiments revealed heterogeneous expression of immune checkpoint receptors in individual patients’ T cells and increased markers of CD8+ T cell dysfunction in the advanced disease stage. Tumor-infiltrating CD8+ T cells had an increased proportion of cells expressing an exhausted expression profile that included upregulation of the immune checkpoint TIGIT, a finding that we validated at the protein level. Our findings point to a profound alteration of the immune landscape of tumors, and to patient-specific immune changes that should be taken into account as combination immunotherapy becomes available for pancreatic cancer.
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All raw data are publicly available without restrictions. All mass cytometry data used for this publication have been deposited in the FlowRepository. All FCS files of tissue (tumor and adjacent/normal) have been uploaded to FlowRepository Experiment FR-FCM-Z2S4 and PBMC files have been uploaded to FlowRepository Experiment FR-FCM-Z2S3 (https://flowrepository.org/id/FR-FCM-Z2S4, https://flowrepository.org/id/FR-FCM-Z2S3). The corresponding file key for the FCS files is in Supplementary Table 6 and refers to Figs. 1 and 7 and Extended Data Figs. 6 and 7. scRNA-seq data with clinical metadata are available from the NIH database of Genotypes and Phenotypes under the accession number phs002071.v1.p1. Deidentified scRNA-seq data are available from the NIH Gene Expression Omnibus database under the accession number GSE155698. All other data supporting the findings of this study are available from the corresponding author upon reasonable request. Source data are provided with this paper.
Code is publicly available from GitHub (https://github.com/PascaDiMagliano-Lab/MultimodalMappingPDA-scRNASeq).
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We thank M. Cochran and T. Wightman at the Flow Cytometry Core at the University of Rochester Medical Center and A. M. Gunawan at the Indiana University Simon Cancer Center Flow Cytometry for support with cell CyTOF acquisition. We thank V. Motta and K. Brown from Fluidigm for assistance with panel design. We thank P. Schnepp and A. Ahmed for assistance with CyTOF experimental design. We thank T. Tamsen and J. Opp from the University of Michigan Advanced Genomics Core. We thank D. Hill and M. Czerwinski for input on designing single-cell analysis pipelines. We thank A. Gilado and I. Amit for expertise in building our pancreatic interactome network. We thank the Tissue Procurement Center at the University of Michigan. We thank E. Stack (formerly with PerkinElmer) for assistance with initial R introduction and basic training using inForm 2.3.0 and earlier versions and staining strategies. We thank P. Turncliff for excellent graphics. We thank J. Spence for the VE-cadherin antibody gift. This project was supported by NIH/NCI grants R01CA151588, R01CA198074 and the American Cancer Society (to M.P.d.M.). This work was also supported by a University of Michigan Cancer Center Support Grant (P30CA046592), including an administrative supplement and by NIH/NCI grant U01CA224145 H.C.C. and M.P.d.M. F.B. was funded by the Association for Academic Surgery Joel J. Roslyn Award. T.L.F. was funded by K08CA201581. S.B.K. was supported by T32-GM113900. N.G.S., V.R.S. and K.D. were supported by T32-CA009676. E.S.C. is supported by the American College of Gastroenterology Clinical Research Award and by T32-DK094775. N.G.S. is a recipient of the American Cancer Society Postdoctoral Award PF-19-096-01 and the Michigan Institute for Clinical and Health Research (MICHR) Postdoctoral Translational Scholars Program fellowship award. A.R. and S.T. were supported by institutional startup funds from the University of Michigan, a gift from Agilent Technologies, NCI grant R37CA214955 and a Research Scholar Grant from the American Cancer Society (RSG-16-005−01). The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.
The authors declare no competing interests.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Extended Data Fig. 1 CyTOF and multiplex fluorescent immunohistochemistry (mfIHC) mapping can be readily performed on patient tumor samples and show a heterogeneous immune infiltration in human pancreatic cancer.
a, Patient breakdown and tumor characteristics of CyTOF performed on 8 adj/norm pancreas and 10 PDA tumor samples (surgical (7) vs. fine needle biopsy (FNB) (3)). b, Representative H&E stains of samples DS20191258 (Adj/Norm), DS20191299 (PDA tumor from surgical resection), and DS20191324 (PDA tumor from fine needle biopsy). c, The ConsensusClusterPlus and FlowSOM R packages were used to define the initial 22 clusters identified in the tissue CyTOF samples. d, Final heatmap demonstrating marker expression used to define cell populations. e, Manual gating of CD3-CD8A-CD45+CD56+ NK cells in adjacent/normal and PDA tissue samples, n=5 adjacent/normal tissue samples and n=4 PDA tissue samples. Two-sided Student’s t-test was performed to compare between groups and asterisk indicates a p value of less than 0.05 was considered significant. For manual gating of NK cells n=5 for adj/norm and n=4 for PDA patient samples. f, mfIHC composite image of PDA (left). Phenotype map with the following basic phenotypes at their x and y coordinates: T cell (green), epithelial cells (pink), APCs (orange), other cells (grey) (right). 71 individual PDA and 34 individual chronic pancreatitis subjects were examined in this analysis. g, Relative cellular composition by quantitation of mfIHC of representative surgical PDA tissue of additional patients DS20181166 (PDA tumor from distal pancreatectomy), DS20181141 (PDA tumor from distal pancreatectomy). h, Corresponding mfIHC images of DS20181166, and DS20181141.
Extended Data Fig. 2 Single Cell RNA Sequencing of PDA tissue reveals heterogeneous cellular composition and expression of immune checkpoints.
a, Single cell RNA sequencing tissue sample breakdown (n = 3 Adj/Norm tissue, n=10 PDA tissue from fine needle biopsy, and n=6 PDA tissue from surgical resection), patient clinical data, and tumor characteristics (grade and stage) (Left panel). Breakdown of sequenced PBMC samples with corresponding patient clinical data (Right panel). b, UMAP of the merged tissue colored by Patient ID prior to batch correction (Left panel) and post batch correction (Right panel). c, UMAP of 3 individual adjacent/normal samples and d, 16 PDA tissues. We distinguished two epithelial populations: tumor cells and acinar cells. In the non-epithelial compartment, we identified fibroblasts, pericytes, CD8+ T cells, CD4+ T cells, Tregs, NK cells, B cells, plasma cells, mast cells, macrophages, granulocytes, dendritic cells, endothelial cells, and a small endocrine population.
Extended Data Fig. 3 Single Cell RNA Sequencing of PDA PBMCs reveals heterogeneous cellular composition and expression of immune checkpoints.
a, Merged UMAP plots of PBMCs from 4 healthy donors and 16 PDA patients (total of 70,113 cells). CD8 T cells (green), CD4 T cells (light green), NK cells (purple), pDCs (blue), Granulocyte (light orange), Monocyte (orange), B cells (yellow), Plasma cells (light yellow). b, Dot plot analysis of key markers to define the 8 identified cell populations. Color of dot represents average expression, while the size of the dot represents percent expression. Dot plot represents merged healthy (n=4) and PDA (n=16) patient gene expression of PBMC lineage markers. c, Average expression of immune checkpoint ligands and receptors in the identified cell populations in merged blood samples. d, Average expression of immune checkpoint receptors on CD8+ T cells in merged PBMCs. e, Average expression of differentially expressed genes in CD8+ T cells comparing healthy (black) to PDA (grey) PBMCs. Disease stage is plotted on the left.
Extended Data Fig. 4 Single cell RNA sequencing reveals 3 CD8+ T cell populations: effector, exhausted, and memory CD8+ T Cells.
a, Feature plots of immune checkpoints (PDCD1, LAG3, TIGIT, HAVCR2), activation markers (IFNG, GZMB), and exhaustion markers (GZMK, EOMES) in CD8+ T cells. b, Number of effector (pink), exhausted (green), and memory (blue) CD8+ T cells captured in each individual tissue sample by scRNA seq. c, Average scaled expression heatmap of highly enriched genes by potential effector, exhausted, and memory cell populations. (n = 3 Adj/Norm tissue and n= 16 PDA tissue for panels a–c).
a, Violin Plots illustrating comparison of immune checkpoint ligands in myeloid clusters in PDA vs. adjacent normal/pancreas samples. b, Average expression heatmap of checkpoint ligands in merged macrophages (all cells expressing CD68 within the myeloid population) and c, merged granulocytes (all cells expressing FCGR3B within the myeloid population). Left panels denote disease state (adjacent/normal vs. PDA tissue) and stage. d, Map of all putative ligand receptor differential interactions that are upregulated in 16 PDA compared to 3 adjacent/normal pancreas. The line color denotes cellular source of the ligand, and putative interactions were visualized in Cytoscape® V3.7.1. e, Dot plot analysis showing expression of adenosine receptors in PDA tumor cell types. Red indicates high expression, blue low expression, and the size of the dot is relative to the percent that marker is expressed. Dot plot represent n=16 PDA patient gene expression of adenosine receptors.
a, Patient breakdown and characteristics of CyTOF performed on patient blood samples (n = 16 healthy patients, n = 10 chronic pancreatitis patients, and n=36 PDA patients). b, t-SNE analysis of CyTOF of all merged PBMC samples with granulocytes (CD66b+). c, t-SNE analysis of CyTOF of all merged PBMC samples without granulocytes. Key marker t-SNE feature plots of CD3 (total T cells), CD4 (Helper CD4+ T cells), CD8 (Cytotoxic T cells), CD19 (B cells), CD11b (Myeloid cells), CCR2, PDL-1, and CD68 (Macrophage marker). d, Bar plots of relative cell type abundance (B cell, CD4+/CD8+ T cell, CD4+ T cell, CD4-/CD8- T cell, Dendritic cell, CD14+/CD16+ Monocyte, CD14+/CD16- Monocyte, and CD14- CD16+ Monocyte) from CyTOF of PBMCs of healthy, chronic pancreatitis, and PDA patients. e, Quantification of unbiased analysis (Astrolabe pipeline) of PBMC immune populations in n=16 healthy patients, n=36 PDA patients, and n=10 chronic pancreatitis patients. Two-sided Student’s t-tests were performed to compare between groups and a p value of <0.05 was considered significant. f, Relative CyTOF marker expression in CD8+ T Cells from PDA tumor tissue. g, PCA analysis of PBMCs at different disease states. Healthy (neon blue), PDA (red), and Chronic Pancreatitis (green).
a, Individual channels of immunofluorescent staining of patient tissues with antibodies specific for TIGIT/CD8A, TIGIT/FOXP3, PVR/Pan-cytokeratin, PVR/CD163, PVR/Vimentin, and PVR/VE-cadherin. Three individual patient tumors were examined independently per staining analysis. b, Manual gating of PD-L1+ CD68+ macrophages in normal adjacent (n=8) and PDA (n=10) tissue. Two-sided Student’s t-test was performed, and asterisk indicates a p value of <0.05, which was considered statistically significant. Representative individual CyTOF biaxial density plots from normal adjacent and PDA tissue of a matched patient (19–262) of PD-L1 expression in CD68+ macrophages (as a percentage of total CD11b+ cells).
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Steele, N.G., Carpenter, E.S., Kemp, S.B. et al. Multimodal mapping of the tumor and peripheral blood immune landscape in human pancreatic cancer. Nat Cancer 1, 1097–1112 (2020). https://doi.org/10.1038/s43018-020-00121-4
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