Coupled single-cell RNA, TCR, and barcoded pMHC multimer sequencing, from virus-specific PBMC T-cells
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PROVIDER: PRJEB72617 | ENA |
REPOSITORIES: ENA
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Project description:Developmental checkpoints in stem/progenitor cells are critical to the determination, commitment and differentiation into distinct lineages. Cancer cells often retain expression of lineage-specific checkpoint proteins, but their potential impact in cancer remains elusive. T lymphocytes mature in the thymus following a highly orchestrated developmental process that entails the successive rearrangements and expression of T-cell receptor (TCR) genes. Low affinity recognition of self-peptide/MHC complexes (self-pMHC) presented by thymic epithelial cells by the TCR of CD4+CD8+ (DP) cortical thymocytes transduces positive selection signals that ultimately shape the developing T cell repertoire. DP thymocytes not receiving these signals die by lack of stimulation whereas those that recognize self-pMHC with high affinity undergo TCR-mediated apoptosis and negative selection. In T-cell acute lymphoblastic leukaemia (T-ALL), leukaemic transformation of maturating thymocytes results from the acquisition of multiple genetic and epigenetic alterations in oncogenes and tumour suppressor genes, that disrupt the normal regulatory circuits and drive clonal expansion of differentiation-arrested lymphoblasts. We show here that TCR triggering by negatively-selecting self-pMHC prevented T-ALL development and leukaemia maintenance in mice. Induction of TCR signalling by high affinity self-pMHC or treatment with monoclonal antibodies to the CD3 signalling chain (anti-CD3) caused massive leukaemic cell death and a gene expression program resembling that of thymocyte negative selection. Importantly, anti-CD3 treatment hampered leukaemogenesis in mice transplanted with either mouse or patient-derived T-ALLs. These data provide a rationale for targeted therapy based on anti-CD3 treatment of T-ALL patients and demonstrate that endogenous developmental checkpoint proteins are amenable to therapeutic intervention in cancer cells. Gene expression data from four culture conditions was performed for the following cells: ALL-SIL-TCRα/β-GFP co-cultured on OP9-DL1 for 48 h, ALL-SIL-TCRα/β-GFP without co-culture, ALL-SIL cells transduced with TLX shRNA (sh-TLX), and ALL-SIL transduced with sh-control vectors. All conditions are performed in two replicates.
2016-08-20 | E-GEOD-65496 | biostudies-arrayexpress
Project description:Peptide exchange technologies are essential for the generation of pMHC-multimer libraries for probing diverse, polyclonal TCR repertoires in various settings. Here we report, using the molecular chaperone TAPBPR, a robust method for the capture of stable, empty MHC-I molecules, which can be readily tetramerized and loaded with peptides of choice in a high-throughput manner. Alternatively, catalytic amounts of TAPBPR can be used to exchange ‘goldilocks’ peptides with high-affinity peptides of interest in an overnight reaction. Using the same system, we describe high-throughput assays to validate binding of multiple candidate peptides on the empty MHCI groove. Combined with tetramer-barcoding via a multi-modal cellular indexing technology, ECCITE-seq, our approach allows a combined analysis of TCR repertoires and other T-cell transcription profiles together with their cognate pMHC-I specificities in a single experiment.
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Project description:Developmental checkpoints in stem/progenitor cells are critical to the determination, commitment and differentiation into distinct lineages. Cancer cells often retain expression of lineage-specific checkpoint proteins, but their potential impact in cancer remains elusive. T lymphocytes mature in the thymus following a highly orchestrated developmental process that entails the successive rearrangements and expression of T-cell receptor (TCR) genes. Low affinity recognition of self-peptide/MHC complexes (self-pMHC) presented by thymic epithelial cells by the TCR of CD4+CD8+ (DP) cortical thymocytes transduces positive selection signals that ultimately shape the developing T cell repertoire. DP thymocytes not receiving these signals die by lack of stimulation whereas those that recognize self-pMHC with high affinity undergo TCR-mediated apoptosis and negative selection. In T-cell acute lymphoblastic leukaemia (T-ALL), leukaemic transformation of maturating thymocytes results from the acquisition of multiple genetic and epigenetic alterations in oncogenes and tumour suppressor genes, that disrupt the normal regulatory circuits and drive clonal expansion of differentiation-arrested lymphoblasts. We show here that TCR triggering by negatively-selecting self-pMHC prevented T-ALL development and leukaemia maintenance in mice. Induction of TCR signalling by high affinity self-pMHC or treatment with monoclonal antibodies to the CD3 signalling chain (anti-CD3) caused massive leukaemic cell death and a gene expression program resembling that of thymocyte negative selection. Importantly, anti-CD3 treatment hampered leukaemogenesis in mice transplanted with either mouse or patient-derived T-ALLs. These data provide a rationale for targeted therapy based on anti-CD3 treatment of T-ALL patients and demonstrate that endogenous developmental checkpoint proteins are amenable to therapeutic intervention in cancer cells.
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Project description:Naïve T cells constantly experience TCR signals in response to self-peptides presented by MHC (pMHC) in vivo. The intensity of these basal or tonic TCR signals can be indirectly read out by expression of surrogate markers of tonic TCR signaling, including the Nur77-GFP transgene and Ly6c. The strength of tonic TCR signaling varies broadly across the naïve CD4+ T cell population and is correlated with functional heterogeneity.Cells that experience the most basal TCR signaling (Nur77-GFP hi, Ly6c lo) are hyporesponsive to peptide-MHC stimulation. Here we examine whether tonic TCR stimulation is associated with differences in mRNA expression.
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