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Hu Z, Guo X, Li Z, Meng Z, Huang S. The neoantigens derived from transposable elements - A hidden treasure for cancer immunotherapy. Biochim Biophys Acta Rev Cancer 2024; 1879:189126. [PMID: 38849060 DOI: 10.1016/j.bbcan.2024.189126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 05/26/2024] [Accepted: 06/02/2024] [Indexed: 06/09/2024]
Abstract
Neoantigen-based therapy is a promising approach that selectively activates the immune system of the host to recognize and eradicate cancer cells. Preliminary clinical trials have validated the feasibility, safety, and immunogenicity of personalized neoantigen-directed vaccines, enhancing their effectiveness and broad applicability in immunotherapy. While many ongoing oncological trials concentrate on neoantigens derived from mutations, these targets do not consistently provoke an immune response in all patients harboring the mutations. Additionally, tumors like ovarian cancer, which have a low tumor mutational burden (TMB), may be less amenable to mutation-based neoantigen therapies. Recent advancements in next-generation sequencing and bioinformatics have uncovered a rich source of neoantigens from non-canonical RNAs associated with transposable elements (TEs). Considering the substantial presence of TEs in the human genome and the proven immunogenicity of TE-derived neoantigens in various tumor types, this review investigates the latest findings on TE-derived neoantigens, examining their clinical implications, challenges, and unique advantages in enhancing tumor immunotherapy.
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Affiliation(s)
- Zhixiang Hu
- Department of Integrative Oncology, Fudan University Shanghai Cancer Center, and Shanghai Key Laboratory of Medical Epigenetics, International Co-laboratory of Medical Epigenetics and Metabolism, Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Xinyi Guo
- Department of Integrative Oncology, Fudan University Shanghai Cancer Center, and Shanghai Key Laboratory of Medical Epigenetics, International Co-laboratory of Medical Epigenetics and Metabolism, Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Ziteng Li
- Department of Integrative Oncology, Fudan University Shanghai Cancer Center, and Shanghai Key Laboratory of Medical Epigenetics, International Co-laboratory of Medical Epigenetics and Metabolism, Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Zhiqiang Meng
- Department of Integrative Oncology, Fudan University Shanghai Cancer Center, and Shanghai Key Laboratory of Medical Epigenetics, International Co-laboratory of Medical Epigenetics and Metabolism, Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China.
| | - Shenglin Huang
- Department of Integrative Oncology, Fudan University Shanghai Cancer Center, and Shanghai Key Laboratory of Medical Epigenetics, International Co-laboratory of Medical Epigenetics and Metabolism, Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China.
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2
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Smith R. Bringing cell therapy to tumors: considerations for optimal CAR binder design. Antib Ther 2023; 6:225-239. [PMID: 37846297 PMCID: PMC10576856 DOI: 10.1093/abt/tbad019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023] Open
Abstract
Chimeric antigen receptor (CAR)-T cells have revolutionized the immunotherapy of B-cell malignancies and are poised to expand the range of their impact across a broad range of oncology and non-oncology indications. Critical to the success of a given CAR is the choice of binding domain, as this is the key driver for specificity and plays an important role (along with the rest of the CAR structure) in determining efficacy, potency and durability of the cell therapy. While antibodies have proven to be effective sources of CAR binding domains, it has become apparent that the desired attributes for a CAR binding domain do differ from those of a recombinant antibody. This review will address key factors that need to be considered in choosing the optimal binding domain for a given CAR and how binder properties influence and are influenced by the rest of the CAR.
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Affiliation(s)
- Richard Smith
- Department of Research, Kite, a Gilead Company, 5858 Horton Street, Suite 240, Emeryville, CA 94070, USA
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3
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Hadiloo K, Tahmasebi S, Esmaeilzadeh A. CAR-NKT cell therapy: a new promising paradigm of cancer immunotherapy. Cancer Cell Int 2023; 23:86. [PMID: 37158883 PMCID: PMC10165596 DOI: 10.1186/s12935-023-02923-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 04/10/2023] [Indexed: 05/10/2023] Open
Abstract
Today, cancer treatment is one of the fundamental problems facing clinicians and researchers worldwide. Efforts to find an excellent way to treat this illness continue, and new therapeutic strategies are developed quickly. Adoptive cell therapy (ACT) is a practical approach that has been emerged to improve clinical outcomes in cancer patients. In the ACT, one of the best ways to arm the immune cells against tumors is by employing chimeric antigen receptors (CARs) via genetic engineering. CAR equips cells to target specific antigens on tumor cells and selectively eradicate them. Researchers have achieved promising preclinical and clinical outcomes with different cells by using CARs. One of the potent immune cells that seems to be a good candidate for CAR-immune cell therapy is the Natural Killer-T (NKT) cell. NKT cells have multiple features that make them potent cells against tumors and would be a powerful replacement for T cells and natural killer (NK) cells. NKT cells are cytotoxic immune cells with various capabilities and no notable side effects on normal cells. The current study aimed to comprehensively provide the latest advances in CAR-NKT cell therapy for cancers.
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Affiliation(s)
- Kaveh Hadiloo
- Student Research Committee, Department of immunology, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Safa Tahmasebi
- Student Research Committee, Department of immunology, School of Medicine, Shahid beheshti University of Medical Sciences, Tehran, Iran.
| | - Abdolreza Esmaeilzadeh
- Department of Immunology, Zanjan University of Medical Sciences, Zanjan, Iran.
- Cancer Gene Therapy Research Center (CGRC), Zanjan University of Medical Sciences, Zanjan, Iran.
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4
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Li W, Wang F, Li Y, Yan L, Liu L, Zhu W, Ma P, Shi X, Yang G. Potent NTD-Targeting Neutralizing Antibodies against SARS-CoV-2 Selected from a Synthetic Immune System. Vaccines (Basel) 2023; 11:vaccines11040771. [PMID: 37112683 PMCID: PMC10143083 DOI: 10.3390/vaccines11040771] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/01/2023] [Accepted: 03/07/2023] [Indexed: 04/03/2023] Open
Abstract
The majority of neutralizing antibodies (NAbs) against SARS-CoV-2 recognize the receptor-binding domain (RBD) of the spike (S) protein. As an escaping strategy, the RBD of the virus is highly variable, evolving mutations to thwart a natural immune response or vaccination. Targeting non-RBD regions of the S protein thus provides a viable alternative to generating potential, robust NAbs. Using a pre-pandemic combinatorial antibody library of 1011, through an alternate negative and positive screening strategy, 11 non-RBD-targeting antibodies are identified. Amongst one NAb that binds specifically to the N-terminal domain of the S protein, SA3, shows mutually non-exclusive binding of the angiotensin-converting enzyme 2 receptor with the S protein. SA3 appears to be insensitive to the conformational change and to interact with both the “open” and “closed” configurations of the trimeric S protein. SA3 shows compatible neutralization as S-E6, an RBD-targeting NAb, against the wild type and variant of concern (VOC) B.1.351 (Beta) of the SARS-CoV-2 pseudo virus. More importantly, the combination of SA3 with S-E6 is synergistic and recovers from the 10-fold loss in neutralization efficacy against the VOC B.1.351 pseudo virus.
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Affiliation(s)
- Wenping Li
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China; (W.L.)
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
- CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Shanghai 200031, China
- University of Chinese Academy of Sciences, Beijing 101408, China
| | - Fulian Wang
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China; (W.L.)
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
- CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Shanghai 200031, China
- University of Chinese Academy of Sciences, Beijing 101408, China
| | - Yu Li
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China; (W.L.)
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
- CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Shanghai 200031, China
- University of Chinese Academy of Sciences, Beijing 101408, China
| | - Lei Yan
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China; (W.L.)
| | - Lili Liu
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China; (W.L.)
| | - Wei Zhu
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China; (W.L.)
| | - Peixiang Ma
- Shanghai Key Laboratory of Orthopedic Implants, Department of Orthopedic Surgery, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200031, China
| | - Xiaojie Shi
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China; (W.L.)
- Correspondence: (X.S.); (G.Y.); Tel.: +86-21-20685030 (G.Y.)
| | - Guang Yang
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China; (W.L.)
- Correspondence: (X.S.); (G.Y.); Tel.: +86-21-20685030 (G.Y.)
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5
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Gao L, Du X, Li J, Qin FXF. Evolving roles of CD38 metabolism in solid tumour microenvironment. Br J Cancer 2023; 128:492-504. [PMID: 36396822 PMCID: PMC9938187 DOI: 10.1038/s41416-022-02052-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 10/20/2022] [Accepted: 10/27/2022] [Indexed: 11/19/2022] Open
Abstract
Given that plenty of clinical findings and reviews have already explained in detail on the progression of CD38 in multiple myeloma and haematological system tumours, here we no longer give unnecessary discussion on the above progression. Though therapeutic antibodies have been regarded as a greatest breakthrough in multiple myeloma immunotherapies due to the durable anti-tumour responses in the clinic, but the role of CD38 in the immunologic regulation and evasion of non-hematopoietic solid tumours are just initiated and controversial. Therefore, we will focus on the bio-function of CD38 enzymatic substrates or metabolites in the variety of non-hematopoietic malignancies and the potential therapeutic value of targeting the CD38-NAD+ or CD38-cADPR/ADPR signal axis. Though limited, we review some ongoing researches and clinical trials on therapeutic approaches in solid tumour as well.
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Affiliation(s)
- Long Gao
- Department of Infectious Disease, The First Affiliated Hospital of Anhui Medical University, 230022, Hefei, China
| | - Xiaohong Du
- Institute of Clinical Medicine Research, Suzhou Science and Technology Town Hospital, Suzhou, China
| | - Jiabin Li
- Department of Infectious Disease, The First Affiliated Hospital of Anhui Medical University, 230022, Hefei, China.
| | - F Xiao-Feng Qin
- Institute of Systems Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, 100005, Beijing, China.
- Suzhou Institute of Systems Medicine, 215123, Suzhou, China.
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Keshavarz A, Salehi A, Khosravi S, Shariati Y, Nasrabadi N, Kahrizi MS, Maghsoodi S, Mardi A, Azizi R, Jamali S, Fotovat F. Recent findings on chimeric antigen receptor (CAR)-engineered immune cell therapy in solid tumors and hematological malignancies. Stem Cell Res Ther 2022; 13:482. [PMID: 36153626 PMCID: PMC9509604 DOI: 10.1186/s13287-022-03163-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 08/12/2022] [Indexed: 11/10/2022] Open
Abstract
Advancements in adoptive cell therapy over the last four decades have revealed various new therapeutic strategies, such as chimeric antigen receptors (CARs), which are dedicated immune cells that are engineered and administered to eliminate cancer cells. In this context, CAR T-cells have shown significant promise in the treatment of hematological malignancies. However, many obstacles limit the efficacy of CAR T-cell therapy in both solid tumors and hematological malignancies. Consequently, CAR-NK and CAR-M cell therapies have recently emerged as novel therapeutic options for addressing the challenges associated with CAR T-cell therapies. Currently, many CAR immune cell trials are underway in various human malignancies around the world to improve antitumor activity and reduce the toxicity of CAR immune cell therapy. This review will describe the comprehensive literature of recent findings on CAR immune cell therapy in a wide range of human malignancies, as well as the challenges that have emerged in recent years.
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Affiliation(s)
- Ali Keshavarz
- Department of Hematology and Blood Banking, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ali Salehi
- Department of Oral and Maxillofacial Radiology, School of Dentistry, Islamic Azad University,, Isfahan (Khorasgan) Branch, Isfahan, Iran
| | - Setareh Khosravi
- Department of Orthodontics, School of Dentistry, Alborz University of Medical Sciences, Karaj, Iran
| | - Yasaman Shariati
- Department of General Surgery, School of Medicine, Arak University of Medical Sciences, Arak, Iran
| | - Navid Nasrabadi
- Department of Endodontics, School of Dentistry, Birjand University of Medical Sciences, Birjand, Iran
| | | | - Sairan Maghsoodi
- Department of Paramedical, Kurdistan University of Medical Sciences, Sanandaj, Iran
| | - Amirhossein Mardi
- Department of Immunology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ramyar Azizi
- Department of Immunology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Samira Jamali
- Department of Endodontics, College of Stomatology, Stomatological Hospital, Xi’an Jiaotong University, Shaanxi, People’s Republic of China
| | - Farnoush Fotovat
- Department of Prosthodontics, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
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7
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Ren P, Zhang C, Li W, Wang X, Liang A, Yang G, Xu H, Ma P. CAR-T Therapy in Clinical Practice: Technical Advances and Current Challenges. Adv Biol (Weinh) 2022; 6:e2101262. [PMID: 35652169 DOI: 10.1002/adbi.202101262] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 03/22/2022] [Indexed: 01/28/2023]
Abstract
Chimeric antigen receptors (CAR) redirect T cells to specifically recognize and eliminate tumor cells. CAR-T therapy has achieved successful clinical outcomes, and it has been transformed into commercially available products to treat acute lymphoblastic leukemia and B cell lymphoma. These breakthroughs have motivated hundreds of CAR-T clinical trials initiated each year, with ≈900 cases registered on the ClinicalTrials website till 2021. Accumulating clinical experiences have highlighted some limitations of this strategy, e.g., relapse after complete response, poor efficacy in solid tumors, on-target off-tumor toxicities, lack of persistence, and tumor resistance. These challenges limit the therapeutic application of CAR-T cells. Multidisciplinary approaches are actively investigated to address these issues. In this review, the antigens, CAR designs, and cell sources are summarized in clinical trials from 2020 to 2021. The innovative modular and programmable designs in CAR-T cells, including advances in signaling domains, antigen-recognition domains, T cell engineering, and cell resources, are further discussed. Integrative genetic and chemical engineering strategies are promising to improve the versatility, antitumor efficacy, persistence, and safety of CAR-T cells. In the future, the next generation of CAR-T cell therapies will offer more options for patients who are refractory to standard tumor therapies.
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Affiliation(s)
- Ping Ren
- Shanghai Institute for Advanced Immunochemical Studies (SIAIS), ShanghaiTech University, Shanghai, 201210, P. R. China
| | - Chuyue Zhang
- Shanghai Institute for Advanced Immunochemical Studies (SIAIS), ShanghaiTech University, Shanghai, 201210, P. R. China
| | - Wenping Li
- Shanghai Institute for Advanced Immunochemical Studies (SIAIS), ShanghaiTech University, Shanghai, 201210, P. R. China
| | - Xian Wang
- Shanghai Institute for Advanced Immunochemical Studies (SIAIS), ShanghaiTech University, Shanghai, 201210, P. R. China
| | - Aibing Liang
- Department of Hematology, Tongji Hospital, Tongji University School of Medicine, 1239 Siping Road, Shanghai, 200092, P. R. China
| | - Guang Yang
- Shanghai Institute for Advanced Immunochemical Studies (SIAIS), ShanghaiTech University, Shanghai, 201210, P. R. China
| | - Hongtao Xu
- Shanghai Institute for Advanced Immunochemical Studies (SIAIS), ShanghaiTech University, Shanghai, 201210, P. R. China
| | - Peixiang Ma
- Shanghai Key Laboratory of Orthopedic Implants, Department of Orthopedic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, P. R. China.,Zhejiang Laboratory, Hangzhou, Zhejiang, 311121, P. R. China
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8
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Miwa H, Dimatteo R, de Rutte J, Ghosh R, Di Carlo D. Single-cell sorting based on secreted products for functionally defined cell therapies. MICROSYSTEMS & NANOENGINEERING 2022; 8:84. [PMID: 35874174 PMCID: PMC9303846 DOI: 10.1038/s41378-022-00422-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 05/18/2022] [Accepted: 06/13/2022] [Indexed: 05/13/2023]
Abstract
Cell therapies have emerged as a promising new class of "living" therapeutics over the last decade and have been particularly successful for treating hematological malignancies. Increasingly, cellular therapeutics are being developed with the aim of treating almost any disease, from solid tumors and autoimmune disorders to fibrosis, neurodegenerative disorders and even aging itself. However, their therapeutic potential has remained limited due to the fundamental differences in how molecular and cellular therapies function. While the structure of a molecular therapeutic is directly linked to biological function, cells with the same genetic blueprint can have vastly different functional properties (e.g., secretion, proliferation, cell killing, migration). Although there exists a vast array of analytical and preparative separation approaches for molecules, the functional differences among cells are exacerbated by a lack of functional potency-based sorting approaches. In this context, we describe the need for next-generation single-cell profiling microtechnologies that allow the direct evaluation and sorting of single cells based on functional properties, with a focus on secreted molecules, which are critical for the in vivo efficacy of current cell therapies. We first define three critical processes for single-cell secretion-based profiling technology: (1) partitioning individual cells into uniform compartments; (2) accumulating secretions and labeling via reporter molecules; and (3) measuring the signal associated with the reporter and, if sorting, triggering a sorting event based on these reporter signals. We summarize recent academic and commercial technologies for functional single-cell analysis in addition to sorting and industrial applications of these technologies. These approaches fall into three categories: microchamber, microfluidic droplet, and lab-on-a-particle technologies. Finally, we outline a number of unmet needs in terms of the discovery, design and manufacturing of cellular therapeutics and how the next generation of single-cell functional screening technologies could allow the realization of robust cellular therapeutics for all patients.
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Affiliation(s)
- Hiromi Miwa
- Department of Bioengineering, University of California - Los Angeles, Los Angeles, CA 90095 USA
| | - Robert Dimatteo
- Department of Chemical and Biomolecular Engineering, University of California - Los Angeles, Los Angeles, CA 90095 USA
| | - Joseph de Rutte
- Department of Bioengineering, University of California - Los Angeles, Los Angeles, CA 90095 USA
- Partillion Bioscience, Los Angeles, CA 90095 USA
| | - Rajesh Ghosh
- Department of Bioengineering, University of California - Los Angeles, Los Angeles, CA 90095 USA
| | - Dino Di Carlo
- Department of Bioengineering, University of California - Los Angeles, Los Angeles, CA 90095 USA
- Department of Mechanical and Aerospace Engineering, University of California - Los Angeles, Los Angeles, CA 90095 USA
- California NanoSystems Institute (CNSI), University of California - Los Angeles, Los Angeles, CA 90095 USA
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9
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Halim L, Das KK, Larcombe-Young D, Ajina A, Candelli A, Benjamin R, Dillon R, Davies DM, Maher J. Engineering of an Avidity-Optimized CD19-Specific Parallel Chimeric Antigen Receptor That Delivers Dual CD28 and 4-1BB Co-Stimulation. Front Immunol 2022; 13:836549. [PMID: 35222427 PMCID: PMC8863855 DOI: 10.3389/fimmu.2022.836549] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 01/20/2022] [Indexed: 11/13/2022] Open
Abstract
Co-stimulation is critical to the function of chimeric antigen receptor (CAR) T-cells. Previously, we demonstrated that dual co-stimulation can be effectively harnessed by a parallel (p)CAR architecture in which a CD28-containing second generation CAR is co-expressed with a 4-1BB containing chimeric co-stimulatory receptor (CCR). When compared to linear CARs, pCAR-engineered T-cells elicit superior anti-tumor activity in a range of pre-clinical models. Since CD19 is the best validated clinical target for cellular immunotherapy, we evaluated a panel of CD19-specific CAR and pCAR T-cells in this study. First, we generated a panel of single chain antibody fragments (scFvs) by alanine scanning mutagenesis of the CD19-specific FMC63 scFv (VH domain) and these were incorporated into second generation CD28+CD3ζ CARs. The resulting panel of CAR T-cells demonstrated a broad range of CD19 binding ability and avidity for CD19-expressing tumor cells. Each scFv-modified CAR was then converted into a pCAR by co-expression of an FMC63 scFv-targeted CCR with a 4-1BB endodomain. When compared to second generation CARs that contained an unmodified or mutated FMC63 scFv, each pCAR demonstrated a significant enhancement of tumor re-stimulation potential and IL-2 release, reduced exhaustion marker expression and enhanced therapeutic efficacy in mice with established Nalm-6 leukemic xenografts. These data reinforce the evidence that the pCAR platform delivers enhanced anti-tumor activity through effective provision of dual co-stimulation. Greatest anti-tumor activity was noted for intermediate avidity CAR T-cells and derived pCARs, raising the possibility that effector to target cell avidity is an important determinant of efficacy.
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Affiliation(s)
- Leena Halim
- Chimeric Antigen Receptor (CAR) Mechanics Laboratory, Guy's Cancer Centre, School of Cancer and Pharmaceutical Sciences, King's College London, London, United Kingdom
| | | | - Daniel Larcombe-Young
- Chimeric Antigen Receptor (CAR) Mechanics Laboratory, Guy's Cancer Centre, School of Cancer and Pharmaceutical Sciences, King's College London, London, United Kingdom
| | - Adam Ajina
- Chimeric Antigen Receptor (CAR) Mechanics Laboratory, Guy's Cancer Centre, School of Cancer and Pharmaceutical Sciences, King's College London, London, United Kingdom
| | | | - Reuben Benjamin
- Faculty of Life Sciences and Medicine, School of Cancer and Pharmaceutical Sciences, King's College London, London, United Kingdom.,Department of Clinical Haematology, King's College Hospital National Health Service (NHS) Foundation Trust, London, United Kingdom
| | - Richard Dillon
- Department of Clinical Haematology, Guy's and St Thomas' National Health Service (NHS) Foundation Trust, London, United Kingdom.,Department of Medicine and Molecular Genetics, King's College London, London, United Kingdom
| | - David M Davies
- Chimeric Antigen Receptor (CAR) Mechanics Laboratory, Guy's Cancer Centre, School of Cancer and Pharmaceutical Sciences, King's College London, London, United Kingdom
| | - John Maher
- Chimeric Antigen Receptor (CAR) Mechanics Laboratory, Guy's Cancer Centre, School of Cancer and Pharmaceutical Sciences, King's College London, London, United Kingdom.,Leucid Bio, Guy's Hospital, London, United Kingdom.,Department of Clinical Immunology and Allergy, King's College Hospital National Health Service (NHS) Foundation Trust, London, United Kingdom.,Department of Immunology, Eastbourne Hospital, Eastbourne, United Kingdom
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