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O’Neal J, Cooper ML, Ritchey JK, Gladney S, Niswonger J, González LS, Street E, Haas GJ, Carter A, Amayta PN, Gao F, Lee BH, Choi D, Berrien-Elliott M, Zhou A, Fehniger TA, Rettig MP, DiPersio JF. Anti-myeloma efficacy of CAR-iNKT is enhanced with a long-acting IL-7, rhIL-7-hyFc. Blood Adv 2023; 7:6009-6022. [PMID: 37399471 PMCID: PMC10582278 DOI: 10.1182/bloodadvances.2023010032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 05/30/2023] [Accepted: 06/19/2023] [Indexed: 07/05/2023] Open
Abstract
Multiple myeloma (MM), a malignancy of mature plasma cells, remains incurable. B-cell maturation antigen (BCMA) is the lead protein target for chimeric antigen receptor (CAR) therapy because of its high expression in most MM, with limited expression in other cell types, resulting in favorable on-target, off tumor toxicity. The response rate to autologous BCMA CAR-T therapy is high; however, it is not curative and is associated with risks of cytokine release syndrome (CRS) and immune effector cell-associated neurotoxicity syndrome. Outcomes in patients treated with BCMA CAR-T cells (CAR-Ts) may improve with allogeneic CAR T-cell therapy, which offer higher cell fitness and reduced time to treatment. However, to prevent the risk of graft-versus-host disease (GVHD), allogenic BCMA CAR-Ts require genetic deletion of the T-cell receptor (TCR), which has potential for unexpected functional or phenotype changes. Invariant natural killer T cells (iNKTs) have an invariant TCR that does not cause GVHD and, as a result, can be used in an allogeneic setting without the need for TCR gene editing. We demonstrate significant anti-myeloma activity of BCMA CAR-iNKTs in a xenograft mouse model of myeloma. We found that a long-acting interleukin-7 (IL-7), rhIL-7-hyFc, significantly prolonged survival and reduced tumor burden in BCMA CAR-iNKT-treated mice in both primary and re-challenge settings. Furthermore, in CRS in vitro assays, CAR-iNKTs induced less IL-6 than CAR-Ts, suggesting a reduced likelihood of CAR-iNKT therapy to induce CRS in patients. These data suggest that BCMA CAR-iNKTs are potentially a safer, effective alternative to BCMA CAR-Ts and that BCMA CAR-iNKT efficacy is further potentiated with rhIL-7-hyFc.
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Affiliation(s)
- Julie O’Neal
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO
| | - Matthew L. Cooper
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
| | - Julie K. Ritchey
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
| | - Susan Gladney
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
| | - Jessica Niswonger
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
| | - L. Sofía González
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
| | - Emily Street
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
| | - Gabriel J. Haas
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
| | - Alun Carter
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
| | - Parmeshwar N. Amayta
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
| | - Feng Gao
- Division of Public Health Sciences, Department of Surgery, Washington University School of Medicine, Saint Louis, MO
| | | | | | - Melissa Berrien-Elliott
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO
| | - Alice Zhou
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO
| | - Todd A. Fehniger
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO
| | - Mike P. Rettig
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO
| | - John F. DiPersio
- Division of Oncology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO
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O'Neal J, Ritchey JK, Cooper ML, Niswonger J, Sofía González L, Street E, Rettig MP, Gladney SW, Gehrs L, Abboud R, Prior JL, Haas GJ, Jayasinghe RG, Ding L, Ghobadi A, Vij R, DiPersio JF. CS1 CAR-T targeting the distal domain of CS1 (SLAMF7) shows efficacy in high tumor burden myeloma model despite fratricide of CD8+CS1 expressing CAR-T cells. Leukemia 2022; 36:1625-1634. [PMID: 35422095 PMCID: PMC9162922 DOI: 10.1038/s41375-022-01559-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 03/11/2022] [Accepted: 03/24/2022] [Indexed: 11/09/2022]
Abstract
Despite improvement in treatment options for myeloma patients, including targeted immunotherapies, multiple myeloma remains a mostly incurable malignancy. High CS1 (SLAMF7) expression on myeloma cells and limited expression on normal cells makes it a promising target for CAR-T therapy. The CS1 protein has two extracellular domains - the distal Variable (V) domain and the proximal Constant 2 (C2) domain. We generated and tested CS1-CAR-T targeting the V domain of CS1 (Luc90-CS1-CAR-T) and demonstrated anti-myeloma killing in vitro and in vivo using two mouse models. Since fratricide of CD8 + cells occurred during production, we generated fratricide resistant CS1 deficient Luc90- CS1- CAR-T (ΔCS1-Luc90- CS1- CAR-T). This led to protection of CD8 + cells in the CAR-T cultures, but had no impact on efficacy. Our data demonstrate targeting the distal V domain of CS1 could be an effective CAR-T treatment for myeloma patients and deletion of CS1 in clinical production did not provide an added benefit using in vivo immunodeficient NSG preclinical models.
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Affiliation(s)
- Julie O'Neal
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA.
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO, 63110, USA.
| | - Julie K Ritchey
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
| | - Matthew L Cooper
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Jessica Niswonger
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
| | - L Sofía González
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
| | - Emily Street
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
| | - Michael P Rettig
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Susan W Gladney
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
| | - Leah Gehrs
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
| | - Ramzi Abboud
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Julie L Prior
- Department of Radiology, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
| | - Gabriel J Haas
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
| | - Reyka G Jayasinghe
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
- McDonnell Genome Institute, Washington University in St. Louis, St. Louis, MO, 63108, USA
| | - Li Ding
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO, 63110, USA
- McDonnell Genome Institute, Washington University in St. Louis, St. Louis, MO, 63108, USA
- Department of Genetics, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
| | - Armin Ghobadi
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Ravi Vij
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - John F DiPersio
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO, 63110, USA.
- Siteman Cancer Center, Washington University in St. Louis, St. Louis, MO, 63110, USA.
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