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TCR affinity defines tumor-specific CD8 T cell differentiation and dysfunction

ABSTRACT: TCR affinity defines tumor-specific CD8 T cell differentiation and dysfunction

PROVIDER: PRJNA594907 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10668700_1.fastq.gz	Fastqsanger.gz
	SRR10668700_2.fastq.gz	Fastqsanger.gz
	SRR10668701_1.fastq.gz	Fastqsanger.gz
	SRR10668701_2.fastq.gz	Fastqsanger.gz
	SRR10668702_1.fastq.gz	Fastqsanger.gz

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T cell receptor signal strength and antigen affinity differentially regulate memory CD8+ T cell development

Project description:IL-2 inducible tyrosine kinase (Itk) is a Tec family non-receptor tyrosine kinase that is known to regulate T cell receptor signal strength (TcR) and T cell development and differentiation. TcR signal strength and antigen affinity are parameters known to regulate the development of CD8+ T cell memory. However, the intersection between TcR signal strength and antigen affinity on CD8+ memory T cell development remains unclear. Therefore, we compared the transcriptomes of WT and Itk-/- OT-1/Rag-/- CD8+ T cells at day 0 and day 7 following infection with Listeria monocytogenes expressing the SIINFEKL (N4) or SIITFEKL (T4) OVA peptide variant (different affinities for TcR) by RNA sequencing.

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TCR affinity defines tumor-specific CD8 T cell differentiation and dysfunction

Project description:This SuperSeries is composed of the SubSeries listed below.

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Project description:T cells have the remarkable ability to sense and discriminate between a wide range of antigenic peptides bound to major histocompatibility complex molecules (pMHC). Here, we use interactomics to monitor in a time dependent manner the early molecular events taking place upon stimulation of murine CD8+ T cells with ligands of different affinity to the TCR. We used the mouse OT-I model in which T cells specifically recognize the ovalbumin OVA 257-264 peptide (SIINFEKL, also named N4) bound to the MHC-I molecule H-2Kb (pMHC). The OT-I TCR also recognizes altered peptide ligands amongst which SIITFEKL (T4) and SIIGFEKL (G4) with sub-optimal binding capacities (ligand affinity N4>T4>G4). For affinity purification (AP) of signalling complexes, we crossed OT-I TCR transgenic mice onto mice expressing an endogenous tagged (One-Strep-Tag: OST) version of the CD3z (also called CD247), ZAP70 or SLP76 molecules. CD8+ T cells were purified from pooled lymph nodes and spleens, shortly expanded, and were left unstimulated or stimulated with N4, T4 and G4 soluble pMHC tetramers for 30, 120 or 300 s. Complexes formed around either CD247, ZAP70 or SLP76 were then purified and analysed by mass spectrometry. Each AP-MS purification is associated with a corresponding control (purification from OT-I CD8+ T cells expressing only the endogenous version of each bait, cultured and stimulated in the same conditions). The number of replicate biological experiments was n=3 for all time-points, and each sample was analyzed twice by single-run nano LC-MS. In addition, the whole proteome of OT-I cell was analyzed by label-free shotgun proteomics in order to calculate cellular protein abundances for each interactor.

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