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Arbulo-Echevarria MM, Vico-Barranco I, Zhang F, Fernandez-Aguilar LM, Chotomska M, Narbona-Sánchez I, Zhang L, Malissen B, Liang Y, Aguado E. Mutation of the glycine residue preceding the sixth tyrosine of the LAT adaptor severely alters T cell development and activation. Front Immunol 2022; 13:1054920. [PMID: 36569841 PMCID: PMC9768323 DOI: 10.3389/fimmu.2022.1054920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 11/21/2022] [Indexed: 12/12/2022] Open
Abstract
The LAT transmembrane adaptor is essential to transduce intracellular signals triggered by the TCR. Phosphorylation of its four C-terminal tyrosine residues (136, 175, 195, and 235 in mouse LAT) recruits several proteins resulting in the assembly of the LAT signalosome. Among those tyrosine residues, the one found at position 136 of mouse LAT plays a critical role for T cell development and activation. The kinetics of phosphorylation of this residue is delayed as compared to the three other C-terminal tyrosines due to a conserved glycine residue found at position 135. Mutation of this glycine into an aspartate residue (denoted LATG135D) increased TCR signaling and altered antigen recognition in human Jurkat T cells and ex vivo mouse T cells. Here, using a strain of LATG135D knockin mice, we showed that the LATG135D mutation modifies thymic development, causing an increase in the percentage of CD4+CD8+ double-positive cells, and a reduction in the percentage of CD4+ and CD8+ single-positive cells. Interestingly, the LATG135D mutation alters thymic development even in a heterozygous state. In the periphery, the LATG135D mutation reduces the percentage of CD8+ T cells and results in a small increment of γδ T cells. Remarkably, the LATG135D mutation dramatically increases the percentage of central memory CD8+ T cells. Finally, analysis of the proliferation and activation of T lymphocytes shows increased responses of T cells from mutant mice. Altogether, our results reinforce the view that the residue preceding Tyr136 of LAT constitutes a crucial checkpoint in T cell development and activation.
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Affiliation(s)
- Mikel M. Arbulo-Echevarria
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Universidad de Cádiz, Cádiz, Spain,Institute of Biomedical Research Cadiz (INIBICA), Cádiz, Spain
| | - Inmaculada Vico-Barranco
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Universidad de Cádiz, Cádiz, Spain,Institute of Biomedical Research Cadiz (INIBICA), Cádiz, Spain
| | - Fanghui Zhang
- Centre d’Immunologie de Marseille-Luminy (CIML), Aix Marseille Université, INSERM, CNRS, Marseille, France,Henan Key Laboratory for Immunology and Targeted Therapy, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang, China
| | - Luis M. Fernandez-Aguilar
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Universidad de Cádiz, Cádiz, Spain,Institute of Biomedical Research Cadiz (INIBICA), Cádiz, Spain
| | - Martyna Chotomska
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Universidad de Cádiz, Cádiz, Spain
| | - Isaac Narbona-Sánchez
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Universidad de Cádiz, Cádiz, Spain,Institute of Biomedical Research Cadiz (INIBICA), Cádiz, Spain
| | - Lichen Zhang
- Henan Key Laboratory for Immunology and Targeted Therapy, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang, China
| | - Bernard Malissen
- Centre d’Immunologie de Marseille-Luminy (CIML), Aix Marseille Université, INSERM, CNRS, Marseille, France,Laboratory of Immunophenomics, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang, China
| | - Yinming Liang
- Henan Key Laboratory for Immunology and Targeted Therapy, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang, China
| | - Enrique Aguado
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Universidad de Cádiz, Cádiz, Spain,Institute of Biomedical Research Cadiz (INIBICA), Cádiz, Spain,*Correspondence: Enrique Aguado,
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Colucci F, Turner M, Schweighoffer E, Guy-Grand D, Di Bartolo V, Salcedo M, Tybulewicz VLJ, Di Santo JP. Redundant Role of the Syk Protein Tyrosine Kinase in Mouse NK Cell Differentiation. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.163.4.1769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Abstract
Syk and ZAP-70 subserve nonredundant functions in B and T lymphopoiesis. In the absence of Syk, B cell development is blocked, while T cell development is arrested in the absence of ZAP-70. The receptors and the signaling molecules required for differentiation of NK cells are poorly characterized. Here we investigate the role of the Syk protein tyrosine kinase in NK cell differentiation. Hemopoietic chimeras were generated by reconstituting alymphoid (B−, T−, NK−) recombinase-activating gene-2 × common cytokine receptor γ-chain double-mutant mice with Syk−/− fetal liver cells. The phenotypically mature Syk−/− NK cells that developed in this context were fully competent in natural cytotoxicity and in calibrating functional inhibitory receptors for MHC molecules. Syk-deficient NK cells demonstrated reduced levels of Ab-dependent cellular cytotoxicity. Nevertheless, Syk−/− NK cells could signal through NK1.1 and 2B4 activating receptors and expressed ZAP-70 protein. We conclude that the Syk protein tyrosine kinase is not essential for murine NK cell development, and that compensatory signaling pathways (including those mediated through ZAP-70) may sustain most NK cell functions in the absence of Syk.
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Affiliation(s)
- Francesco Colucci
- *Institut National de la Santé et de la Recherche Médicale, Unit 429, Hôpital Necker-Enfants Malades, Paris, France
- 2 Current address: Babraham Institute, Babraham, Cambridge, U.K
| | - Martin Turner
- †National Institute for Medical Research, The Ridgeway, Mill Hill, London, United Kingdom; and
- 2 Current address: Babraham Institute, Babraham, Cambridge, U.K
| | - Edina Schweighoffer
- †National Institute for Medical Research, The Ridgeway, Mill Hill, London, United Kingdom; and
- 2 Current address: Babraham Institute, Babraham, Cambridge, U.K
| | - Delphine Guy-Grand
- *Institut National de la Santé et de la Recherche Médicale, Unit 429, Hôpital Necker-Enfants Malades, Paris, France
- 2 Current address: Babraham Institute, Babraham, Cambridge, U.K
| | - Vincenzo Di Bartolo
- ‡Institute Pasteur, Paris, France
- 2 Current address: Babraham Institute, Babraham, Cambridge, U.K
| | - Margarita Salcedo
- ‡Institute Pasteur, Paris, France
- 2 Current address: Babraham Institute, Babraham, Cambridge, U.K
| | - Victor L. J. Tybulewicz
- †National Institute for Medical Research, The Ridgeway, Mill Hill, London, United Kingdom; and
- 2 Current address: Babraham Institute, Babraham, Cambridge, U.K
| | - James P. Di Santo
- *Institut National de la Santé et de la Recherche Médicale, Unit 429, Hôpital Necker-Enfants Malades, Paris, France
- 2 Current address: Babraham Institute, Babraham, Cambridge, U.K
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