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Rotte A. Editorial: Emerging learnings in cell therapy: novel binding domains, universal CAR-T cells, and more. Front Oncol 2024; 14:1404376. [PMID: 38686191 PMCID: PMC11056576 DOI: 10.3389/fonc.2024.1404376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Accepted: 03/29/2024] [Indexed: 05/02/2024] Open
Affiliation(s)
- Anand Rotte
- Department of Clinical and Regulatory Affairs, Arcellx Inc, Redwood City, CA, United States
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Zhou J, Shi F, Luo X, Lei B, Shi Z, Huang C, Zhang Y, Li X, Wang H, Li XY, He X. The persistence and antitumor efficacy of CAR-T cells are modulated by tonic signaling within the CDR. Int Immunopharmacol 2024; 126:111239. [PMID: 37979453 DOI: 10.1016/j.intimp.2023.111239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 11/07/2023] [Accepted: 11/13/2023] [Indexed: 11/20/2023]
Abstract
Chimeric antigen receptor (CAR) T cell therapy has demonstrated remarkable clinical efficacy, but challenges related to relapse and CAR-T cell exhaustion persist. One contributing factor to this exhaustion is CAR tonic signaling, where CAR-T cells self-activate without antigen stimulation, leading to reduced persistence and impaired antitumor activity. To address this issue, we conducted a preclinical study evaluating tonic signaling using nanobody-derived CAR-T cells. Our investigation revealed that specific characteristics of the complementary determining regions (CDRs), including low solubility, polarity, positive charge, energy, and area of ionic and positive CDR patches of amino acids, were associated with low antigen-independent tonic signaling. Significantly, we observed that stronger tonic signaling directly impacted CAR-T cell proliferation in vitro, consequently leading to CAR-T cell exhaustion and diminished persistence and effectiveness in vivo. Our findings provide compelling preclinical evidence and lay the foundation for the clinical assessment of CAR-T cells with distinct tonic signaling patterns. Understanding the role of CDRs in modulating tonic signaling holds promise for advancing the development of more efficient and durable CAR-T cell therapies, thereby enhancing the treatment of cancer and addressing the challenges of relapse in CAR-T cell therapy.
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Affiliation(s)
- Jincai Zhou
- R&D Department, OriCell Therapeutics Co. Ltd., 1227 Zhangheng Road, Shanghai, 201203, China.
| | - Feifei Shi
- R&D Department, OriCell Therapeutics Co. Ltd., 1227 Zhangheng Road, Shanghai, 201203, China
| | - Xinran Luo
- R&D Department, OriCell Therapeutics Co. Ltd., 1227 Zhangheng Road, Shanghai, 201203, China
| | - Bixia Lei
- R&D Department, OriCell Therapeutics Co. Ltd., 1227 Zhangheng Road, Shanghai, 201203, China
| | - Zhongjun Shi
- R&D Department, OriCell Therapeutics Co. Ltd., 1227 Zhangheng Road, Shanghai, 201203, China
| | - Chenyu Huang
- R&D Department, OriCell Therapeutics Co. Ltd., 1227 Zhangheng Road, Shanghai, 201203, China
| | - Yuting Zhang
- R&D Department, OriCell Therapeutics Co. Ltd., 1227 Zhangheng Road, Shanghai, 201203, China
| | - Xiaopei Li
- R&D Department, OriCell Therapeutics Co. Ltd., 1227 Zhangheng Road, Shanghai, 201203, China
| | - Huajing Wang
- R&D Department, OriCell Therapeutics Co. Ltd., 1227 Zhangheng Road, Shanghai, 201203, China
| | - Xian-Yang Li
- R&D Department, OriCell Therapeutics Co. Ltd., 1227 Zhangheng Road, Shanghai, 201203, China.
| | - Xiaowen He
- R&D Department, OriCell Therapeutics Co. Ltd., 1227 Zhangheng Road, Shanghai, 201203, China.
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This S, Rogers D, Mallet Gauthier È, Mandl JN, Melichar HJ. What's self got to do with it: Sources of heterogeneity among naive T cells. Semin Immunol 2023; 65:101702. [PMID: 36463711 DOI: 10.1016/j.smim.2022.101702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 11/23/2022] [Accepted: 11/25/2022] [Indexed: 12/04/2022]
Abstract
There is a long-standing assumption that naive CD4+ and CD8+ T cells are largely homogeneous populations despite the extraordinary diversity of their T cell receptors (TCR). The self-immunopeptidome plays a key role in the selection of the naive T cell repertoire in the thymus, and self-peptides are also an important driver of differences between individual naive T cells with regard to their subsequent functional contributions to an immune response. Accumulating evidence suggests that as early as the β-selection stage of T cell development, when only one of the recombined chains of the mature TCR is expressed, signaling thresholds may be established for positive selection of immature thymocytes. Stochastic encounters subsequently made with self-ligands during positive selection in the thymus imprint functional biases that a T cell will carry with it throughout its lifetime, although ongoing interactions with self in the periphery ensure a level of plasticity in the gene expression wiring of naive T cells. Identifying the sources of heterogeneity in the naive T cell population and which functional attributes of T cells can be modulated through post-thymic interventions versus those that are fixed during T cell development, could enable us to better select or generate T cells with particular traits to improve the efficacy of T cell therapies.
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Affiliation(s)
- Sébastien This
- Department of Microbiology, Infectious Disease, and Immunology, Université de Montréal, Montreal, Canada; Immunology-Oncology Unit, Maisonneuve-Rosemont Hospital Research Center, Montreal, Canada
| | - Dakota Rogers
- Department of Physiology and McGill Research Centre on Complex Traits, McGill University, Montreal, Canada
| | - Ève Mallet Gauthier
- Department of Microbiology, Infectious Disease, and Immunology, Université de Montréal, Montreal, Canada; Immunology-Oncology Unit, Maisonneuve-Rosemont Hospital Research Center, Montreal, Canada
| | - Judith N Mandl
- Department of Physiology and McGill Research Centre on Complex Traits, McGill University, Montreal, Canada.
| | - Heather J Melichar
- Immunology-Oncology Unit, Maisonneuve-Rosemont Hospital Research Center, Montreal, Canada; Department of Medicine, Université de Montréal, Montreal, Canada.
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Abstract
CARs are synthetic receptors designed to drive antigen-specific activation upon binding of the scFv to its cognate antigen. However, CARs can also elicit different levels of ligand-independent constitutive signaling, also known as tonic signaling. Chronic T cell activation is observed in certain combinations of scFv, hinge, and costimulatory domains and may be increased due to high levels of CAR expression. Tonic signaling can be identified during primary T cell expansion due to differences in the phenotype and growth of CAR-T cells compared to control T cells. CARs displaying tonic signaling are associated with accelerated T cell differentiation and exhaustion and impaired antitumor effects. Selecting CARs which configuration does not induce tonic signaling is important to enhance antigen-specific T cell responses. In this chapter, we describe in detail different protocols to identify tonic signaling driven by CARs during primary T cell ex vivo expansion.
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Affiliation(s)
- Hugo Calderon
- Department of Hematology and Oncology, Hospital Clinic, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Maksim Mamonkin
- Center for Cell and Gene Therapy, Baylor College of Medicine, Houston, TX, USA
| | - Sonia Guedan
- Department of Hematology and Oncology, Hospital Clinic, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain.
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Sun W, Shchepakin D, Kalachev LV, Kavanaugh MP. Glutamate transporter control of ambient glutamate levels. Neurochem Int 2014; 73:146-51. [PMID: 24768447 DOI: 10.1016/j.neuint.2014.04.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2014] [Revised: 04/08/2014] [Accepted: 04/10/2014] [Indexed: 11/26/2022]
Abstract
Accurate knowledge of the ambient extracellular glutamate concentration in brain is required for understanding its potential impacts on tonic and phasic receptor signaling. Estimates of ambient glutamate based on microdialysis measurements are generally in the range of ∼2-10μM, approximately 100-fold higher than estimates based on electrophysiological measurements of tonic NMDA receptor activity (∼25-90nM). The latter estimates are closer to the low nanomolar estimated thermodynamic limit of glutamate transporters. The reasons for this discrepancy are not known, but it has been suggested that microdialysis measurements could overestimate ambient extracellular glutamate because of reduced glutamate transporter activity in a region of metabolically impaired neuropil adjacent to the dialysis probe. We explored this issue by measuring diffusion gradients created by varying membrane densities of glutamate transporters expressed in Xenopus oocytes. With free diffusion from a pseudo-infinite 10μM glutamate source, the surface concentration of glutamate depended on transporter density and was reduced over 2 orders of magnitude by transporters expressed at membrane densities similar to those previously reported in hippocampus. We created a diffusion model to simulate the effect of transport impairment on microdialysis measurements with boundary conditions corresponding to a 100μm radius probe. A gradient of metabolic disruption in a thin (∼100μm) region of neuropil adjacent to the probe increased predicted [Glu] in the dialysate over 100-fold. The results provide support for electrophysiological estimates of submicromolar ambient extracellular [Glu] in brain and provide a possible explanation for the higher values reported using microdialysis approaches.
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Affiliation(s)
- Weinan Sun
- Center for Structural and Functional Neuroscience, The University of Montana, Missoula, MT 59812, United States
| | - Denis Shchepakin
- Department of Mathematics, The University of Montana, Missoula, MT 59812, United States
| | - Leonid V Kalachev
- Center for Structural and Functional Neuroscience, The University of Montana, Missoula, MT 59812, United States; Department of Mathematics, The University of Montana, Missoula, MT 59812, United States
| | - Michael P Kavanaugh
- Center for Structural and Functional Neuroscience, The University of Montana, Missoula, MT 59812, United States.
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