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Exhausted intratumoral Vδ2- γδ T cells in human kidney cancer retain effector function [scRNA-seq]

ABSTRACT: Gamma delta (γδ) T cells reside within human tissues including tumors, but their role in mediating anti-tumor response with immune checkpoint inhibition is unknown. Using single-cell approaches, we found that kidney cancers are infiltrated by diverse Vδ2- γδ T cells, with equivalent representation of Vδ1+ and Vδ1- cells, that are distinct from γδ T cells found in normal human tissues. These tumor-resident Vδ2- T cells can express the transcriptional program of exhausted alpha beta (ab) CD8+ T cells as well as canonical markers of terminal T cell exhaustion including PD-1, TIGIT and TIM-3. While Vδ2- γδ T cells have blunted IL-2 production, they retain expression of cytolytic effector molecules and costimulatory receptors like 4-1BB. Exhausted Vδ2- γδ T cells are comprised of three distinct populations that lack TCF-7, are clonally expanded, express of cytotoxic molecules, and possess multiple Vδ2- TCRs. Human tumor-derived Vδ2- γδ T cells maintain cytotoxic function and pro-inflammatory cytokine secretion in vitro. The transcriptional program of Vδ2- T cells in pre-treatment tumor biopsies predicted subsequent clinical responses to PD-1 blockade in vivo in cancer patients. Thus, Vδ2- γδ T cells within the tumor microenvironment can contribute to anti-tumor efficacy.

ORGANISM(S): Homo sapiens

PROVIDER: GSE223808 | GEO | 2023/01/31

REPOSITORIES: GEO

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Project description:Our team had previously explored the potential of expanding cord blood (CB) derived γδ T cells (CB-gdT) as well as their corresponding ability to target primary acute myeloid leukemia (AML) cells. Using a feeder cell line-based in vitro expansion protocol, we achieved a clinically relevant scale expansion of γδ T cells over a period of 14 days. These cells exhibit variable degree of potency against a range of human AML cell lines and primary patient samples. In order to dissect the cellular and molecular programs governing the activation, differentiation and functional states of our in vitro expanded CB-gdT, we performed multiplex single cell sequencing analysis using the 10X Genomics Chromium System. After initial quality check and filtering, data from a total of 4,276 cells were retrieved. Among which, we identified 742 unique TCRγδ clonotypes, representing 18.6% of the starting 4,000 FACS purified γδ T cells seeded for expansion. Consistent to our FACS analysis, Vδ1 is the predominant TRD chain in the expanded cultures, accounting for 61.2% of all clones. Based on uniform manifold approximation and projection for dimension reduction (UMAP), all cells were clustered into 11 subsets. Key cytotoxic genes including GZMB, GZMA and NKG7 were all highly expressed across all clusters, indicating that the expanded cells were indeed functionally cytotoxic. Comparing against multiple curated gene sets, we have identified 3 main subsets of γδ T cells: the Proliferative, Cytotoxic γδ T cells (P-CT), Differentiated Cytotoxic γδ T cells (D-CT) and Late Activated Cytotoxic γδ T cells (LA-CT). P-CT (~46% of all cells) shows an expression profile positively associated with cell proliferation as well as increased cell surface expression of memory T cell markers CD27, CCR7 and CD62L. Similar to cytotoxic genes, genes associated with TCR signaling and interferon response were found to be expressed across all cell clusters, yet with elevated levels in D-CT and LA-CT. Furthermore, cell surface expression of different NK receptors including NKG2D, DNAM1 and NKp30 are more enriched in LA-CT compared to the other 2 subsets, suggesting the acquisition of additional NK receptor related functions in this group of cells. Consistent with the concept of progressive γδ T cell differentiation and activation in culture, we found that in 85 (11.5%) of the γδ T cell clones bearing more than 10 cells each, all clones contain cells distributed across the 3 different γδ T cell subsets. This is the first report on single cell immune profiling of in vitro expanded gdT cells derived from human CB.

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Exhausted intratumoral Vδ2- γδ T cells in human kidney cancer retain effector function [scRNA-seq]

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