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Hassan R, Tomar S, Zhang J, Khanal M, Hong J, Venugopalan A, Jiang Q, Sengupta M, Miettinen M, Li N, Pastan I, Ho M. Development of highly effective anti-mesothelin hYP218 Chimeric Antigen Receptor T cells with increased tumor infiltration and persistence for treating solid tumors. Mol Cancer Ther 2022; 21:1195-1206. [DOI: 10.1158/1535-7163.mct-22-0073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 03/09/2022] [Accepted: 04/18/2022] [Indexed: 11/16/2022]
Abstract
Abstract
Mesothelin targeting CAR T cells have limited activity in patients. In this study, we sought to determine if efficacy of anti-mesothelin CAR T cells is dependent on the mesothelin epitopes that are recognized by them. To do so, we developed hYP218 (against membrane-proximal epitope) and SS1 (against membrane-distal epitope) CAR T cells. Their efficacy was assessed in vitro using mesothelin positive tumor cell lines and in vivo in NSG mice with mesothelin expressing ovarian cancer (OVCAR-8), pancreatic cancer (KLM-1) and mesothelioma patient-derived (NCI-Meso63) tumor xenografts. Persistence and tumor infiltration of CAR T cells was determined using flow cytometry. hYP218 CAR T cells killed cancer cells more efficiently than SS1 CAR T cells, with 2-4-fold lower ET50 value (Effector to Target ratio for 50% killing of tumor cells). In mice with established tumors, single intravenous administration of hYP218 CAR T cells lead to improved tumor response and survival compared to SS1 CAR T cells, with complete regression of OVCAR-8 and NCI-Meso63 tumors. Compared to SS1 CAR T cells, there was increased peripheral blood expansion, persistence, and tumor infiltration of hYP218 CAR T cells in the KLM-1 tumor model. Persistence of hYP218 CAR T cells in treated mice led to anti-tumor immunity when rechallenged with KLM-1 tumor cells. Our results demonstrate that hYP218 CAR T cells, targeting mesothelin epitope close to cell membrane, are very effective against mesothelin positive tumors and are associated with increased persistence and tumor infiltration. These results support its clinical development to treat patients with mesothelin expressing cancers.
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Affiliation(s)
- Raffit Hassan
- National Cancer Institute, Bethesda, Maryland, United States
| | - Sakshi Tomar
- National Cancer Institute, Bethesda, Maryland, United States
| | - Jingli Zhang
- National Cancer Institute, Bethesda, Maryland, United States
| | | | - Jessica Hong
- National Cancer Institute, Bethesda, Maryland, United States
| | | | - Qun Jiang
- NCI-NIH, Bethesda, MD, United States
| | | | | | - Nan Li
- National Cancer Institute, Bethesda, Maryland, United States
| | - Ira Pastan
- National Cancer Institute, Bethesda, MD, United States
| | - Mitchell Ho
- National Cancer Institute, Bethesda, Maryland, United States
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2
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Houeiss P, Boitard C, Luce S. Preclinical Models to Evaluate the Human Response to Autoantigen and Antigen-Specific Immunotherapy in Human Type 1 Diabetes. Front Endocrinol (Lausanne) 2022; 13:883000. [PMID: 35498419 PMCID: PMC9044628 DOI: 10.3389/fendo.2022.883000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 03/14/2022] [Indexed: 11/13/2022] Open
Abstract
Type 1 Diabetes (T1D) is an autoimmune disease that results from the destruction of pancreatic islet β-cells by auto-reactive T cells. The clinical management of T1D faces the lack of fully predictive biomarkers in its preclinical stage and of antigen-specific therapies to induce or re-induce immune tolerance to β-cell autoantigens and prevent its development. From a therapeutic standpoint, preclinical models of T1D have fallen short of directly translating into humans. To circumvent this limitation, preclinical models are being optimized to allow defining autoantigen epitopes that are presented to T cells and directly apply to the human. In this review, we propose to make a point on the latest available models such as humanized immunodeficient NOD mice models and HLA and autoantigen transgenic mice and their application in the context of T1D.
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Affiliation(s)
- Pamela Houeiss
- Laboratory Immunology of Diabetes, Cochin Institute, Department Endocrinology, Metabolism and Diabetologia (EMD), Institut Nationale de la Santé et de la Recherche Médicale, Unité 1016 (INSERMU1016), Paris, France
- Medical Faculty, Paris University, Paris, France
| | - Christian Boitard
- Laboratory Immunology of Diabetes, Cochin Institute, Department Endocrinology, Metabolism and Diabetologia (EMD), Institut Nationale de la Santé et de la Recherche Médicale, Unité 1016 (INSERMU1016), Paris, France
- Medical Faculty, Paris University, Paris, France
| | - Sandrine Luce
- Laboratory Immunology of Diabetes, Cochin Institute, Department Endocrinology, Metabolism and Diabetologia (EMD), Institut Nationale de la Santé et de la Recherche Médicale, Unité 1016 (INSERMU1016), Paris, France
- Medical Faculty, Paris University, Paris, France
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3
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Xu X, Huang S, Xiao X, Sun Q, Liang X, Chen S, Zhao Z, Huo Z, Tu S, Li Y. Challenges and Clinical Strategies of CAR T-Cell Therapy for Acute Lymphoblastic Leukemia: Overview and Developments. Front Immunol 2021; 11:569117. [PMID: 33643279 PMCID: PMC7902522 DOI: 10.3389/fimmu.2020.569117] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 12/22/2020] [Indexed: 12/12/2022] Open
Abstract
Chimeric antigen receptor (CAR) T-cell therapy exhibits desirable and robust efficacy in patients with acute lymphoblastic leukemia (ALL). Stimulated by the revolutionized progress in the use of FDA-approved CD19 CAR T cells, novel agents with CAR designs and targets are being produced in pursuit of superior performance. However, on the path from bench to bedside, new challenges emerge. Accessibility is considered the initial barrier to the transformation of this patient-specific product into a commercially available product. To ensure infusion safety, profound comprehension of adverse events and proactive intervention are required. Additionally, resistance and relapse are the most critical and intractable issues in CAR T-cell therapy for ALL, thus precluding its further development. Understanding the limitations through up-to-date insights and characterizing multiple strategies will be critical to leverage CAR T-cell therapy flexibly for use in clinical situations. Herein, we provide an overview of the application of CAR T-cell therapy in ALL, emphasizing the main challenges and potential clinical strategies in an effort to promote a standardized set of treatment paradigms for ALL.
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Affiliation(s)
- Xinjie Xu
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China.,State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Shengkang Huang
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Xinyi Xiao
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Qihang Sun
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Xiaoqian Liang
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Sifei Chen
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Zijing Zhao
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Zhaochang Huo
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Sanfang Tu
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Yuhua Li
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
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4
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Nie Y, Lu W, Chen D, Tu H, Guo Z, Zhou X, Li M, Tu S, Li Y. Mechanisms underlying CD19-positive ALL relapse after anti-CD19 CAR T cell therapy and associated strategies. Biomark Res 2020; 8:18. [PMID: 32514351 PMCID: PMC7254656 DOI: 10.1186/s40364-020-00197-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 05/18/2020] [Indexed: 02/07/2023] Open
Abstract
Chimeric antigen receptor (CAR) T cell therapy, especially anti-CD19 CAR T cell therapy, has shown remarkable anticancer activity in patients with relapsed/refractory acute lymphoblastic leukemia, demonstrating an inspiring complete remission rate. However, with extension of the follow-up period, the limitations of this therapy have gradually emerged. Patients are at a high risk of early relapse after achieving complete remission. Although there are many studies with a primary focus on the mechanisms underlying CD19- relapse related to immune escape, early CD19+ relapse owing to poor in vivo persistence and impaired efficacy accounts for a larger proportion of the high relapse rate. However, the mechanisms underlying CD19+ relapse are still poorly understood. Herein, we discuss factors that could become obstacles to improved persistence and efficacy of CAR T cells during production, preinfusion processing, and in vivo interactions in detail. Furthermore, we propose potential strategies to overcome these barriers to achieve a reduced CD19+ relapse rate and produce prolonged survival in patients after CAR T cell therapy.
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Affiliation(s)
- Yuru Nie
- Second Clinical Medical College, Southern Medical University, No. 253, Industrial Avenue, Guangzhou, Guangdong Province China
| | - Weiqing Lu
- Second Clinical Medical College, Southern Medical University, No. 253, Industrial Avenue, Guangzhou, Guangdong Province China
| | - Daiyu Chen
- Second Clinical Medical College, Southern Medical University, No. 253, Industrial Avenue, Guangzhou, Guangdong Province China
| | - Huilin Tu
- Second Clinical Medical College, Southern Medical University, No. 253, Industrial Avenue, Guangzhou, Guangdong Province China
| | - Zhenling Guo
- Department of Hematology, Zhujiang Hospital, Southern Medical University, No. 253, Industrial Avenue, Guangzhou, Guangdong Province China
| | - Xuan Zhou
- Department of Hematology, Zhujiang Hospital, Southern Medical University, No. 253, Industrial Avenue, Guangzhou, Guangdong Province China
| | - Meifang Li
- Department of Hematology, Zhujiang Hospital, Southern Medical University, No. 253, Industrial Avenue, Guangzhou, Guangdong Province China
| | - Sanfang Tu
- Department of Hematology, Zhujiang Hospital, Southern Medical University, No. 253, Industrial Avenue, Guangzhou, Guangdong Province China
| | - Yuhua Li
- Department of Hematology, Zhujiang Hospital, Southern Medical University, No. 253, Industrial Avenue, Guangzhou, Guangdong Province China
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5
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Shultz LD, Keck J, Burzenski L, Jangalwe S, Vaidya S, Greiner DL, Brehm MA. Humanized mouse models of immunological diseases and precision medicine. Mamm Genome 2019; 30:123-142. [PMID: 30847553 PMCID: PMC6610695 DOI: 10.1007/s00335-019-09796-2] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 03/02/2019] [Indexed: 12/25/2022]
Abstract
With the increase in knowledge resulting from the sequencing of the human genome, the genetic basis for the underlying differences in individuals, their diseases, and how they respond to therapies is starting to be understood. This has formed the foundation for the era of precision medicine in many human diseases that is beginning to be implemented in the clinic, particularly in cancer. However, preclinical testing of therapeutic approaches based on individual biology will need to be validated in animal models prior to translation into patients. Although animal models, particularly murine models, have provided significant information on the basic biology underlying immune responses in various diseases and the response to therapy, murine and human immune systems differ markedly. These fundamental differences may be the underlying reason why many of the positive therapeutic responses observed in mice have not translated directly into the clinic. There is a critical need for preclinical animal models in which human immune responses can be investigated. For this, many investigators are using humanized mice, i.e., immunodeficient mice engrafted with functional human cells, tissues, and immune systems. We will briefly review the history of humanized mice, the remaining limitations, approaches to overcome them and how humanized mouse models are being used as a preclinical bridge in precision medicine for evaluation of human therapies prior to their implementation in the clinic.
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Affiliation(s)
- Leonard D Shultz
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA.
| | - James Keck
- The Jackson Laboratory, 1650 Santa Ana Avenue, Sacramento, CA, 95838, USA
| | - Lisa Burzenski
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
| | - Sonal Jangalwe
- Diabetes Center of Excellence, The University of Massachusetts Medical School, 368 Plantation Street, Worcester, MA, 01605, USA
| | - Shantashri Vaidya
- Diabetes Center of Excellence, The University of Massachusetts Medical School, 368 Plantation Street, Worcester, MA, 01605, USA
| | - Dale L Greiner
- Diabetes Center of Excellence, The University of Massachusetts Medical School, 368 Plantation Street, Worcester, MA, 01605, USA
| | - Michael A Brehm
- Diabetes Center of Excellence, The University of Massachusetts Medical School, 368 Plantation Street, Worcester, MA, 01605, USA
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6
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Schinnerling K, Rosas C, Soto L, Thomas R, Aguillón JC. Humanized Mouse Models of Rheumatoid Arthritis for Studies on Immunopathogenesis and Preclinical Testing of Cell-Based Therapies. Front Immunol 2019; 10:203. [PMID: 30837986 PMCID: PMC6389733 DOI: 10.3389/fimmu.2019.00203] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 01/23/2019] [Indexed: 01/12/2023] Open
Abstract
Rodent models of rheumatoid arthritis (RA) have been used over decades to study the immunopathogenesis of the disease and to explore intervention strategies. Nevertheless, mouse models of RA reach their limit when it comes to testing of new therapeutic approaches such as cell-based therapies. Differences between the human and the murine immune system make it difficult to draw reliable conclusions about the success of immunotherapies. To overcome this issue, humanized mouse models have been established that mimic components of the human immune system in mice. Two main strategies have been pursued for humanization: the introduction of human transgenes such as human leukocyte antigen molecules or specific T cell receptors, and the generation of mouse/human chimera by transferring human cells or tissues into immunodeficient mice. Recently, both approaches have been combined to achieve more sophisticated humanized models of autoimmune diseases. This review discusses limitations of conventional mouse models of RA-like disease and provides a closer look into studies in humanized mice exploring their usefulness and necessity as preclinical models for testing of cell-based therapies in autoimmune diseases such as RA.
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Affiliation(s)
- Katina Schinnerling
- Programa Disciplinario de Inmunología, Immune Regulation and Tolerance Research Group, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile.,Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Carlos Rosas
- Departamento de Ciencias Morfológicas, Facultad de Medicina y Ciencia, Universidad San Sebastián, Santiago, Chile
| | - Lilian Soto
- Programa Disciplinario de Inmunología, Immune Regulation and Tolerance Research Group, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile.,Unidad de Dolor, Departamento de Medicina, Hospital Clínico Universidad de Chile, Santiago, Chile
| | - Ranjeny Thomas
- Diamantina Institute, Translational Research Institute, Princess Alexandra Hospital, University of Queensland, Brisbane, QLD, Australia
| | - Juan Carlos Aguillón
- Programa Disciplinario de Inmunología, Immune Regulation and Tolerance Research Group, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile
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7
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McDaniel Mims B, Grisham MB. Humanizing the mouse immune system to study splanchnic organ inflammation. J Physiol 2018; 596:3915-3927. [PMID: 29574759 DOI: 10.1113/jp275325] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 02/13/2018] [Indexed: 12/11/2022] Open
Abstract
It is well known that alterations in splanchnic organ perfusion and/or immune regulation may produce inflammatory tissue injury similar to that observed in several human disorders such as ischaemia and reperfusion injury, food allergies, diabetes, inflammatory bowel disease and graft-versus-host disease. Mouse models have been tremendously important in defining the roles of the circulation, leukocyte trafficking, inflammatory mediator generation, immune regulation and the intestinal microbiota in the pathogenesis of acute and chronic inflammation. However, few of the promising interventions or therapeutics reported in mouse models of inflammatory diseases have been translated to clinically effective treatments in patients. There is growing concern that because of the significant differences that exist between the murine and human immune systems, mouse models may not adequately recapitulate the immuno-pathogenesis of inflammatory diseases. This inconvenient reality has prompted a number of investigators to undertake a series of studies to humanize the murine immune system via adoptive transfer of human lymphoid or progenitor cells into a new generation of immuno-deficient recipients. In this review, we summarize the recent advances that have been made in the development of humanized mice and describe how these mouse models are being used to study the pathophysiology of splanchnic organ inflammation. In addition, we discuss the limitations of the different approaches and present potential solutions for the continued improvement of these important animal models.
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Affiliation(s)
- Brianyell McDaniel Mims
- Department of Immunology and Molecular Microbiology, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
| | - Matthew B Grisham
- Department of Immunology and Molecular Microbiology, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
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8
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Yeh WI, Seay HR, Newby B, Posgai AL, Moniz FB, Michels A, Mathews CE, Bluestone JA, Brusko TM. Avidity and Bystander Suppressive Capacity of Human Regulatory T Cells Expressing De Novo Autoreactive T-Cell Receptors in Type 1 Diabetes. Front Immunol 2017; 8:1313. [PMID: 29123516 PMCID: PMC5662552 DOI: 10.3389/fimmu.2017.01313] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 09/28/2017] [Indexed: 12/12/2022] Open
Abstract
The ability to alter antigen specificity by T-cell receptor (TCR) or chimeric antigen receptor (CAR) gene transfer has facilitated personalized cellular immune therapies in cancer. Inversely, this approach can be harnessed in autoimmune settings to attenuate inflammation by redirecting the specificity of regulatory T cells (Tregs). Herein, we demonstrate efficient protocols for lentiviral gene transfer of TCRs that recognize type 1 diabetes-related autoantigens with the goal of tissue-targeted induction of antigen-specific tolerance to halt β-cell destruction. We generated human Tregs expressing a high-affinity GAD555–567-reactive TCR (clone R164), as well as the lower affinity clone 4.13 specific for the same peptide. We demonstrated that de novo Treg avatars potently suppress antigen-specific and bystander responder T-cell (Tresp) proliferation in vitro in a process that requires Treg activation (P < 0.001 versus unactivated Tregs). When Tresp were also glutamic acid decarboxylase (GAD)-reactive, the high-affinity R164 Tregs exhibited increased suppression (P < 0.01) with lower Tresp-division index (P < 0.01) than the lower affinity 4.13 Tregs. These data demonstrate the feasibility of rapid expansion of antigen-specific Tregs for applications in attenuating β-cell autoimmunity and emphasize further opportunities for engineering cellular specificities, affinities, and phenotypes to tailor Treg activity in adoptive cell therapies for the treatment of type 1 diabetes.
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Affiliation(s)
- Wen-I Yeh
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, United States
| | - Howard R Seay
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, United States
| | - Brittney Newby
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, United States
| | - Amanda L Posgai
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, United States
| | - Filipa Botelho Moniz
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, United States
| | - Aaron Michels
- Barbara Davis Center for Diabetes, University of Colorado School of Medicine, Aurora, CO, United States
| | - Clayton E Mathews
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, United States
| | - Jeffrey A Bluestone
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA, United States
| | - Todd M Brusko
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, United States
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9
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T-Cell Receptor (TCR) Clonotype-Specific Differences in Inhibitory Activity of HIV-1 Cytotoxic T-Cell Clones Is Not Mediated by TCR Alone. J Virol 2017; 91:JVI.02412-16. [PMID: 28077649 DOI: 10.1128/jvi.02412-16] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 12/27/2016] [Indexed: 01/11/2023] Open
Abstract
Functional analysis of T-cell responses in HIV-infected individuals has indicated that virus-specific CD8+ T cells with superior antiviral efficacy are well represented in HIV-1 controllers but are rare or absent in HIV-1 progressors. To define the role of individual T-cell receptor (TCR) clonotypes in differential antiviral CD8+ T-cell function, we performed detailed functional and mass cytometric cluster analysis of multiple CD8+ T-cell clones recognizing the identical HLA-B*2705-restricted HIV-1 epitope KK10 (KRWIILGLNK). Effective and ineffective CD8+ T-cell clones segregated based on responses to HIV-1-infected and peptide-loaded target cells. Following cognate peptide stimulation, effective HIV-specific clones displayed significantly more rapid TCR signal propagation, more efficient initial lytic granule release, and more sustained nonlytic cytokine and chemokine secretion than ineffective clones. To evaluate the TCR clonotype contribution to CD8+ T-cell function, we cloned the TCR α and β chain genes from one effective and two ineffective CD8+ T-cell clones from an elite controller into TCR-expressing lentivectors. We show that Jurkat/MA cells and primary CD8+ T cells transduced with lentivirus expressing TCR from one of the ineffective clones exhibited a level of activation by cognate peptide and inhibition of in vitro HIV-1 infection, respectively, that were comparable to those of the effective clonotype. Taken together, these data suggest that the potent antiviral capacity of some HIV-specific CD8+ T cells is a consequence of factors in addition to TCR sequence that modulate functionality and contribute to the increased antiviral capacity of HIV-specific CD8+ T cells in elite controllers to inhibit HIV infection.IMPORTANCE The greater ex vivo antiviral inhibitory activity of CD8+ T cells from elite controllers than from HIV-1 progressors supports the crucial role of effective HIV-specific CD8+ T cells in controlling HIV-1 replication. The contribution of TCR clonotype to inhibitory potency was investigated by delineating the responsiveness of effective and ineffective CD8+ T-cell clones recognizing the identical HLA-B*2705-restricted HIV-1 Gag-derived peptide, KK10 (KRWIILGLNK). KK10-stimulated "effective" CD8+ T-cell clones displayed significantly more rapid TCR signal propagation, more efficient initial lytic granule release, and more sustained cytokine and chemokine secretion than "ineffective" CD8+ T-cell clones. However, TCRs cloned from an effective and one of two ineffective clones conferred upon primary CD8+ T cells the equivalent potent capacity to inhibit HIV-1 infection. Taken together, these data suggest that other factors aside from intrinsic TCR-peptide-major histocompatibility complex (TCR-peptide-MHC) reactivity can contribute to the potent antiviral capacity of some HIV-specific CD8+ T-cell clones.
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