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Long AW, Xu H, Santich BH, Guo H, Hoseini SS, de Stanchina E, Cheung NKV. Heterodimerization of T cell engaging bispecific antibodies to enhance specificity against pancreatic ductal adenocarcinoma. J Hematol Oncol 2024; 17:20. [PMID: 38650005 PMCID: PMC11036555 DOI: 10.1186/s13045-024-01538-5] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Accepted: 03/22/2024] [Indexed: 04/25/2024] Open
Abstract
BACKGROUND EGFR and/or HER2 expression in pancreatic cancers is correlated with poor prognoses. We generated homodimeric (EGFRxEGFR or HER2xHER2) and heterodimeric (EGFRxHER2) T cell-engaging bispecific antibodies (T-BsAbs) to direct polyclonal T cells to these antigens on pancreatic tumors. METHODS EGFR and HER2 T-BsAbs were constructed using the 2 + 2 IgG-[L]-scFv T-BsAbs format bearing two anti-CD3 scFvs attached to the light chains of an IgG to engage T cells while retaining bivalent binding to tumor antigens with both Fab arms. A Fab arm exchange strategy was used to generate EGFRxHER2 heterodimeric T-BsAb carrying one Fab specific for EGFR and one for HER2. EGFR and HER2 T-BsAbs were also heterodimerized with a CD33 control T-BsAb to generate 'tumor-monovalent' EGFRxCD33 and HER2xCD33 T-BsAbs. T-BsAb avidity for tumor cells was studied by flow cytometry, cytotoxicity by T-cell mediated 51Chromium release, and in vivo efficacy against cell line-derived xenografts (CDX) or patient-derived xenografts (PDX). Tumor infiltration by T cells transduced with luciferase reporter was quantified by bioluminescence. RESULTS The EGFRxEGFR, HER2xHER2, and EGFRxHER2 T-BsAbs demonstrated high avidity and T cell-mediated cytotoxicity against human pancreatic ductal adenocarcinoma (PDAC) cell lines in vitro with EC50s in the picomolar range (0.17pM to 18pM). They were highly efficient in driving human polyclonal T cells into subcutaneous PDAC xenografts and mediated potent T cell-mediated anti-tumor effects. Both EGFRxCD33 and HER2xCD33 tumor-monovalent T-BsAbs displayed substantially reduced avidity by SPR when compared to homodimeric EGFRxEGFR or HER2xHER2 T-BsAbs (∼150-fold and ∼6000-fold respectively), tumor binding by FACS (8.0-fold and 63.6-fold), and T-cell mediated cytotoxicity (7.7-fold and 47.2-fold), while showing no efficacy against CDX or PDX. However, if either EGFR or HER2 was removed from SW1990 by CRISPR-mediated knockout, the in vivo efficacy of heterodimeric EGFRxHER2 T-BsAb was lost. CONCLUSION EGFR and HER2 were useful targets for driving T cell infiltration and tumor ablation. Two arm Fab binding to either one or both targets was critical for robust anti-tumor effect in vivo. By engaging both targets, EGFRxHER2 heterodimeric T-BsAb exhibited potent anti-tumor effects if CDX or PDX were EGFR+HER2+ double-positive with the potential to spare single-positive normal tissue.
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Affiliation(s)
- Alan W Long
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, 1275 York Ave, New York, NY, 10065, USA
| | - Hong Xu
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, 1275 York Ave, New York, NY, 10065, USA
| | - Brian H Santich
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, 1275 York Ave, New York, NY, 10065, USA
| | - Hongfen Guo
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, 1275 York Ave, New York, NY, 10065, USA
| | | | - Elisa de Stanchina
- Antitumor Assessment Core Facility, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Nai-Kong V Cheung
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, 1275 York Ave, New York, NY, 10065, USA.
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Yang Z, Wu Z, Santich BH, Liu J, Liu C, Cheung NKV. Targeting Intracellular Antigens with pMHC-Binding Antibodies: A Phage Display Approach. Methods Mol Biol 2023; 2702:327-345. [PMID: 37679628 DOI: 10.1007/978-1-0716-3381-6_17] [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] [Indexed: 09/09/2023]
Abstract
Antibodies that bind peptide-MHC (pMHC) complex in a manner akin to T cell receptor (TCR) have not only helped in understanding the mechanism of TCR-pMHC interactions in the context of T cell biology but also spurred considerable interest in recent years as potential cancer therapeutics. Traditional methods to generate such antibodies using hybridoma and B cell sorting technologies are sometimes inadequate, possibly due to the small contribution of peptide to the overall B cell epitope space on the surface of the pMHC complex (typical peptide MW = 1 kDa versus MHC MW = 45 kDa) and to the multiple efficiency limiting steps inherent in these methods. In this chapter we describe phage display approaches, including a cell panning strategy, for the rapid generation of such antibodies with high specificity and affinity.
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Affiliation(s)
| | - Zhihao Wu
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Brian H Santich
- Gerstner Sloan Kettering Graduate School of Biomedical Sciences, Memorial Sloan-Kettering Cancer Center, New York, NY, USA
| | | | - Cheng Liu
- Eureka Therapeutics, Emeryville, CA, USA
| | - Nai-Kong V Cheung
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
- Gerstner Sloan Kettering Graduate School of Biomedical Sciences, Memorial Sloan-Kettering Cancer Center, New York, NY, USA.
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3
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Santich BH, Kjellev SL, Cheal S, Wang L, Gillberg M, Vadlamudi M, Ouattara AA, Liebenberg N, Larsen LF, Veach DR, Seo S, Cheung NKV, Larson SM, Lisby S. Abstract 3309: Self-assembling and disassembling (SADA) domain is critical to the binding, and anti-tumor efficacy of GD2-SADA. Cancer Res 2022. [DOI: 10.1158/1538-7445.am2022-3309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Introduction: GD2-SADA is a pre-targeted radioimmunotherapy drug-candidate designed to target radioactive lutetium-177 (in the form of 177Lu-DOTA) to GD2-expressing tumor cells (GD2-SADA:177Lu-DOTA Drug Complex). GD2-SADA is comprised of an anti-GD2 single-chain variable fragment (scFv), an anti-DOTA scFv that binds specifically to DOTA metal chelates, such as 177Lu-DOTA, and a SADA domain based on the human P53 tetramerization sequence, which can self-assemble from a monomeric 60-kDa polypeptide into 240-kDa tetrameric protein. We have previously demonstrated (1) that GD2-SADA has a unique clearance profile that allowed for the delivery of 177Lu-DOTA to tumors with minimal exposure to normal tissues like the bone marrow or kidneys and shrank established neuroblastoma in preclinical mouse models. We now provide additional mechanistic data demonstrating the importance of the SADA domain in providing this potent anti-tumor function.
Methods: To study the role of the SADA domain, we designed a modified version of GD2-SADA that could not self-assemble into a tetrameric state by removing the entire SADA domain. The resulting P53(-/-)GD2-SADA protein retained binding to GD2 and Lu-DOTA but remained in a 60 kDa monomeric state in assays. P53(-/-)GD2-SADA and GD2-SADA were compared using SPR to measure antigen binding affinities, flow cytometry to evaluate cell binding, and in preclinical mouse models to evaluate tumor uptake and anti-tumor efficacy.
Results: GD2-SADA demonstrated stronger binding affinity to GD2 antigen compared to P53(-/-)GD2-SADA, but comparable binding affinity to Lu-DOTA. In SPECT/CT imaging studies using tumor bearing mice, GD2-SADA demonstrated substantially higher uptake and persistence in GD2-expressing tumors compared with P53(-/-)GD2-SADA. Finally, treatment of tumor bearing mice with 3 cycles of GD2-SADA or P53(-/-)GD2-SADA and 177Lu-DOTA (once per week each for 3 weeks) resulted in potent anti-tumor responses from GD2-SADA, with only modest anti-tumor efficacy from P53(-/-)GD2-SADA at two different dose levels corresponding to equal molar doses (1 GD2-SADA to 1 P53(-/-)GD2-SADA) or equal mass doses (1 GD2-SADA to 4 P53(-/-)GD2-SADA i.e. same number of binding sites).
Conclusions: The tetramerizing function of the SADA domain is critically important to the binding activity and anti-tumor efficacy of GD2 SADA. These data confirm that the SADA domain increases tumor antigen binding, uptake and persistence in tumor tissue, and markedly improves anti-tumor responses in preclinical models.
References: Santich BH, Cheal SM, Ahmed M, McDevitt MR, Ouerfelli O, Yang G, et al. A Self-Assembling and Disassembling (SADA) Bispecific Antibody (BsAb) Platform for Curative Two-step Pretargeted Radioimmunotherapy. Clin Cancer Res Off J Am Assoc Cancer Res. 2021 Jan 15;27(2):532-41.
Citation Format: Brian H. Santich, Stine Louise Kjellev, Sarah Cheal, Linlin Wang, Mette Gillberg, Mallika Vadlamudi, Amadou A. Ouattara, Nico Liebenberg, Lone Frost Larsen, Darren R. Veach, Shin Seo, Nai-Kong V. Cheung, Steven M. Larson, Steen Lisby. Self-assembling and disassembling (SADA) domain is critical to the binding, and anti-tumor efficacy of GD2-SADA [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 3309.
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Affiliation(s)
| | | | - Sarah Cheal
- 3Memorial Sloan Kettering Cancer Center, New York, NY
| | | | | | | | | | | | | | | | - Shin Seo
- 3Memorial Sloan Kettering Cancer Center, New York, NY
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4
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Chandler CS, Bell MM, Chung SK, Veach DR, Fung EK, Punzalan B, Burnes Vargas D, Patel M, Xu H, Guo HF, Santich BH, Zanzonico PB, Monette S, Nash GM, Cercek A, Jungbluth A, Pandit-Taskar N, Cheung NKV, Larson SM, Cheal SM. Intraperitoneal Pretargeted Radioimmunotherapy for Colorectal Peritoneal Carcinomatosis. Mol Cancer Ther 2022; 21:125-137. [PMID: 34667111 PMCID: PMC9157533 DOI: 10.1158/1535-7163.mct-21-0353] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 04/22/2021] [Revised: 06/22/2021] [Accepted: 10/15/2021] [Indexed: 11/16/2022]
Abstract
Peritoneal carcinomatosis (PC) is considered incurable, and more effective therapies are needed. Herein we test the hypothesis that GPA33-directed intracompartmental pretargeted radioimmunotherapy (PRIT) can cure colorectal peritoneal carcinomatosis. Nude mice were implanted intraperitoneally with luciferase-transduced GPA33-expressing SW1222 cells for aggressive peritoneal carcinomatosis (e.g., resected tumor mass 0.369 ± 0.246 g; n = 17 on day 29). For GPA33-PRIT, we administered intraperitoneally a high-affinity anti-GPA33/anti-DOTA bispecific antibody (BsAb), followed by clearing agent (intravenous), and lutetium-177 (Lu-177) or yttrium-86 (Y-86) radiolabeled DOTA-radiohapten (intraperitoneal) for beta/gamma-emitter therapy and PET imaging, respectively. The DOTA-radiohaptens were prepared from S-2-(4-aminobenzyl)-1,4,7, 10-tetraazacyclododecane tetraacetic acid chelate (DOTA-Bn). Efficacy and toxicity of single- versus three-cycle therapy were evaluated in mice 26-27 days post-tumor implantation. Single-cycle treatment ([177Lu]LuDOTA-Bn 111 MBq; tumor dose: 4,992 cGy) significantly prolonged median survival (MS) approximately 2-fold to 84.5 days in comparison with controls (P = 0.007). With three-cycle therapy (once weekly, total 333 MBq; tumor dose: 14,975 cGy), 6/8 (75%) survived long-term (MS > 183 days). Furthermore, for these treated long-term survivors, 1 mouse was completely disease free (microscopic "cure") at necropsy; the others showed stabilized disease, which was detectable during PET-CT using [86Y]DOTA-Bn. Treatment controls had MS ranging from 42-52.5 days (P < 0.001) and 19/20 mice succumbed to progressive intraperitoneal disease by 69 days. Multi-cycle GPA33 DOTA-PRIT significantly prolongs survival with reversible myelosuppression and no chronic marrow (929 cGy to blood) or kidney (982 cGy) radiotoxicity, with therapeutic indices of 12 for blood and 12 for kidneys. MTD was not reached.
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Affiliation(s)
| | - Meghan M Bell
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Sebastian K Chung
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Darren R Veach
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York
- Department of Radiology, Weill Cornell Medicine, New York, New York
| | - Edward K Fung
- Department of Radiology, Weill Cornell Medicine, New York, New York
| | - Blesida Punzalan
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York
| | | | - Mitesh Patel
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Hong Xu
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Hong-Fen Guo
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Brian H Santich
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Pat B Zanzonico
- Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Sébastien Monette
- Laboratory of Comparative Pathology, Memorial Sloan Kettering Cancer Center, Weill Cornell Medicine, and The Rockefeller University, New York, New York
| | - Garrett M Nash
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Andrea Cercek
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Achim Jungbluth
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Neeta Pandit-Taskar
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Nai Kong V Cheung
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Steven M Larson
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Sarah M Cheal
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York.
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Santich BH, Park JA, Tran H, Guo HF, Huse M, Cheung NKV. Interdomain spacing and spatial configuration drive the potency of IgG-[L]-scFv T cell bispecific antibodies. Sci Transl Med 2021; 12:12/534/eaax1315. [PMID: 32161106 DOI: 10.1126/scitranslmed.aax1315] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Revised: 09/09/2019] [Accepted: 01/30/2020] [Indexed: 12/15/2022]
Abstract
T cell-bispecific antibodies (BsAbs) couple cytotoxic T lymphocytes to tumor cells, inducing their destruction. Although there are more than 60 classes of BsAbs in development, the relative importance of parameters such as interdomain spacing or spatial configuration is largely unknown. Here, we dissected a symmetric dual bivalent BsAb platform (IgG-[L]-scFv: antitumor IgG with anti-CD3 scFv fused to the light chains) to explore the importance of valency and spatial configuration for BsAb-induced T cell cytotoxicity. Our results revealed that placing tumor and T cell binding domains on the same side of a BsAb (cis-configuration) elicited substantially stronger antitumor activity, in vitro and in vivo, compared to positioning them on opposite sides (trans-configuration). Moreover, using two cis-modules in the same BsAb further improved cytotoxicity (up to 2000-fold). In addition, separating antigen-binding components with a single Ig domain (CL) markedly enhanced cytokine release and in vivo tumor responses compared to smaller (G4S1) or larger (CH1-CH2-CH3) spacers. These findings provide guidelines for improving BsAb function and highlight the importance of spatial configuration and dual bivalency as development parameters.
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Affiliation(s)
- Brian H Santich
- Louis V. Gerstner Jr. Graduate School of Biomedical Sciences, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.,Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Jeong A Park
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Hoa Tran
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Hong-Fen Guo
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Morgan Huse
- Immunology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Nai-Kong V Cheung
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
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6
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Park JA, Santich BH, Xu H, Lum LG, Cheung NKV. Potent ex vivo armed T cells using recombinant bispecific antibodies for adoptive immunotherapy with reduced cytokine release. J Immunother Cancer 2021; 9:e002222. [PMID: 33986124 PMCID: PMC8126293 DOI: 10.1136/jitc-2020-002222] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [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] [Accepted: 03/17/2021] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND T cell-based immunotherapies using chimeric antigen receptors (CAR) or bispecific antibodies (BsAb) have produced impressive responses in hematological malignancies. However, major hurdles remained, including cytokine release syndrome, neurotoxicity, on-target off-tumor effects, reliance on autologous T cells, and failure in most solid tumors. BsAb armed T cells offer a safe alternative. METHODS We generated ex vivo armed T cells (EATs) using IgG-[L]-scFv-platformed BsAb, where the anti-CD3 (huOKT3) scFv was attached to the light chain of a tumor-binding IgG. BsAb density on EAT, in vitro cytotoxicity, cytokine release, in vivo trafficking into tumors, and their antitumor activities were evaluated in multiple cancer cell lines and patient-derived xenograft mouse models. The efficacy of EATs after cryopreservation was studied, and gamma delta (γδ) T cells were investigated as unrelated alternative effector T cells. RESULTS The antitumor potency of BsAb armed T cells was substantially improved using the IgG-[L]-scFv BsAb platform. When compared with separate BsAb and T cell injection, EATs released less TNF-α, and infiltrated tumors faster, while achieving robust antitumor responses. The in vivo potency of EAT therapy depended on BsAb dose for arming, EAT cell number per injection, total number of EAT doses, and treatment schedule intensity. The antitumor efficacy of EATs was preserved following cryopreservation, and EATs using γδ T cells were safe and as effective as αβ T cell-EATs. CONCLUSIONS EATs exerted potent antitumor activities against a broad spectrum of human cancer targets with remarkable safety. The antitumor potency of EATs depended on BsAb dose, cell number and total dose, and schedule. EATs were equally effective after cryopreservation, and the feasibility of third-party γδ-EATs offered an alternative for autologous T cell sources.
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MESH Headings
- Animals
- Antibodies, Bispecific/genetics
- Antibodies, Bispecific/immunology
- Antibodies, Bispecific/metabolism
- Cell Line, Tumor
- Cell Movement
- Coculture Techniques
- Cytokines/metabolism
- Cytotoxicity, Immunologic
- Humans
- Immunotherapy, Adoptive
- Intraepithelial Lymphocytes/immunology
- Intraepithelial Lymphocytes/metabolism
- Intraepithelial Lymphocytes/transplantation
- Lymphocyte Activation
- Lymphocytes, Tumor-Infiltrating/immunology
- Lymphocytes, Tumor-Infiltrating/metabolism
- Lymphocytes, Tumor-Infiltrating/transplantation
- Male
- Mice, Inbred BALB C
- Mice, Knockout
- Neoplasms/genetics
- Neoplasms/immunology
- Neoplasms/metabolism
- Neoplasms/therapy
- Phenotype
- Tumor Microenvironment
- Xenograft Model Antitumor Assays
- Mice
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Affiliation(s)
- Jeong A Park
- Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Brian H Santich
- Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Hong Xu
- Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Lawrence G Lum
- Medicine, University of Virginia, Charlottesville, Virginia, USA
| | - Nai-Kong V Cheung
- Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
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7
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Dacek MM, Veach DR, Cheal SM, Carter LM, McDevitt MR, Punzalan B, Burnes Vargas D, Kubik TZ, Monette S, Santich BH, Yang G, Ouerfelli O, Kesner AL, Cheung NKV, Scheinberg DA, Larson SM, Krebs S. Engineered Cells as a Test Platform for Radiohaptens in Pretargeted Imaging and Radioimmunotherapy Applications. Bioconjug Chem 2021; 32:649-654. [PMID: 33819023 DOI: 10.1021/acs.bioconjchem.0c00595] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pretargeted imaging and radioimmunotherapy approaches are designed to have superior targeting properties over directly targeted antibodies but impose more complex pharmacology, which hinders efforts to optimize the ligands prior to human applications. Human embryonic kidney 293T cells expressing the humanized single-chain variable fragment (scFv) C825 (huC825) with high-affinity for DOTA-haptens (293T-huC825) in a transmembrane-anchored format eliminated the requirement to use other pretargeting reagents and provided a simplified, accelerated assay of radiohapten capture while offering normalized cell surface expression of the molecular target of interest. Using binding assays, ex vivo biodistribution, and in vivo imaging, we demonstrated that radiohaptens based on benzyl-DOTA and a second generation "Proteus" DOTA-platform effectively and specifically engaged membrane-bound huC825, achieving favorable tumor-to-normal tissue uptake ratios in mice. Furthermore, [86Y]Y-DOTA-Bn predicted absorbed dose to critical organs with reasonable accuracy for both [177Lu]Lu-DOTA-Bn and [225Ac]Ac-Pr, which highlights the benefit of a dosimetry-based treatment approach.
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Affiliation(s)
- Megan M Dacek
- Molecular Pharmacology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States.,Department of Pharmacology, Weill Cornell Medical College, New York, New York 10065, United States
| | - Darren R Veach
- Molecular Imaging and Therapy Service, Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States.,Radiochemistry and Imaging Sciences Service, Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States.,Department of Radiology, Weill Cornell Medical College, New York, New York 10065, United States
| | - Sarah M Cheal
- Molecular Pharmacology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Lukas M Carter
- Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Michael R McDevitt
- Molecular Imaging and Therapy Service, Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States.,Department of Radiology, Weill Cornell Medical College, New York, New York 10065, United States
| | - Blesida Punzalan
- Molecular Pharmacology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Daniela Burnes Vargas
- Molecular Pharmacology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Thomas Z Kubik
- Molecular Imaging and Therapy Service, Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Sebastien Monette
- Tri-Institutional Laboratory of Comparative Pathology, Memorial Sloan Kettering Cancer Center, Weill Cornell Medicine, and The Rockefeller University, New York, New York 10065, United States
| | - Brian H Santich
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Guangbin Yang
- Organic Synthesis Core Facility, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Ouathek Ouerfelli
- Organic Synthesis Core Facility, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Adam L Kesner
- Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Nai-Kong V Cheung
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - David A Scheinberg
- Molecular Pharmacology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States.,Department of Pharmacology, Weill Cornell Medical College, New York, New York 10065, United States
| | - Steven M Larson
- Molecular Pharmacology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States.,Molecular Imaging and Therapy Service, Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States.,Department of Radiology, Weill Cornell Medical College, New York, New York 10065, United States
| | - Simone Krebs
- Molecular Imaging and Therapy Service, Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States.,Department of Radiology, Weill Cornell Medical College, New York, New York 10065, United States
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8
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Affiliation(s)
- Brian H Santich
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - Nai-Kong V Cheung
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - Christian Klein
- Cancer Immunotherapy Discovery, Roche Innovation Center Zurich, Schlieren, Switzerland
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9
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Santich BH, Cheal SM, Ahmed M, McDevitt MR, Ouerfelli O, Yang G, Veach DR, Fung EK, Patel M, Burnes Vargas D, Malik AA, Guo HF, Zanzonico PB, Monette S, Michel AO, Rudin CM, Larson SM, Cheung NK. A Self-Assembling and Disassembling (SADA) Bispecific Antibody (BsAb) Platform for Curative Two-step Pretargeted Radioimmunotherapy. Clin Cancer Res 2020; 27:532-541. [PMID: 32958698 DOI: 10.1158/1078-0432.ccr-20-2150] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 07/22/2020] [Accepted: 09/15/2020] [Indexed: 11/16/2022]
Abstract
PURPOSE Many cancer treatments suffer from dose-limiting toxicities to vital organs due to poor therapeutic indices. To overcome these challenges we developed a novel multimerization platform that rapidly removes tumor-targeting proteins from the blood to substantially improve therapeutic index. EXPERIMENTAL DESIGN The platform was designed as a fusion of a self-assembling and disassembling (SADA) domain to a tandem single-chain bispecific antibody (BsAb, anti-ganglioside GD2 × anti-DOTA). SADA-BsAbs were assessed with multiple in vivo tumor models using two-step pretargeted radioimmunotherapy (PRIT) to evaluate tumor uptake, dosimetry, and antitumor responses. RESULTS SADA-BsAbs self-assembled into stable tetramers (220 kDa), but could also disassemble into dimers or monomers (55 kDa) that rapidly cleared via renal filtration and substantially reduced immunogenicity in mice. When used with rapidly clearing DOTA-caged PET isotopes, SADA-BsAbs demonstrated accurate tumor localization, dosimetry, and improved imaging contrast by PET/CT. When combined with therapeutic isotopes, two-step SADA-PRIT safely delivered massive doses of alpha-emitting (225Ac, 1.48 MBq/kg) or beta-emitting (177Lu, 6,660 MBq/kg) S-2-(4-aminobenzyl)-1,4,7,10-tetraazacyclododecane tetraacetic acid (DOTA) payloads to tumors, ablating them without any short-term or long-term toxicities to the bone marrow, kidneys, or liver. CONCLUSIONS The SADA-BsAb platform safely delivered large doses of radioisotopes to tumors and demonstrated no toxicities to the bone marrow, kidneys, or liver. Because of its modularity, SADA-BsAbs can be easily adapted to most tumor antigens, tumor types, or drug delivery approaches to improve therapeutic index and maximize the delivered dose.See related commentary by Capala and Kunos, p. 377.
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Affiliation(s)
- Brian H Santich
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Sarah M Cheal
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Mahiuddin Ahmed
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Michael R McDevitt
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York.,Department of Radiology, Weill Cornell Medical College, New York, New York.,Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Ouathek Ouerfelli
- Organic Synthesis Core Facility, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Guangbin Yang
- Organic Synthesis Core Facility, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Darren R Veach
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Edward K Fung
- Department of Radiology, Weill Cornell Medical College, New York, New York
| | - Mitesh Patel
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Daniela Burnes Vargas
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Aiza A Malik
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Hong-Fen Guo
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Pat B Zanzonico
- Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Sebastien Monette
- Laboratory of Comparative Pathology, Memorial Sloan Kettering Cancer Center, The Rockefeller University, Weill Cornell Medicine, New York, New York
| | - Adam O Michel
- Laboratory of Comparative Pathology, Memorial Sloan Kettering Cancer Center, The Rockefeller University, Weill Cornell Medicine, New York, New York
| | - Charles M Rudin
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Steven M Larson
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York.,Department of Radiology, Weill Cornell Medical College, New York, New York
| | - Nai K Cheung
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York.
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10
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Cheal SM, McDevitt MR, Santich BH, Patel M, Yang G, Fung EK, Veach DR, Bell M, Ahad A, Vargas DB, Punzalan B, Pillarsetty NVK, Xu H, Guo HF, Monette S, Michel AO, Piersigilli A, Scheinberg DA, Ouerfelli O, Cheung NKV, Larson SM. Alpha radioimmunotherapy using 225Ac-proteus-DOTA for solid tumors - safety at curative doses. Theranostics 2020; 10:11359-11375. [PMID: 33052220 PMCID: PMC7546012 DOI: 10.7150/thno.48810] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 07/29/2020] [Indexed: 02/07/2023] Open
Abstract
This is the initial report of an α-based pre-targeted radioimmunotherapy (PRIT) using 225Ac and its theranostic pair, 111In. We call our novel tumor-targeting DOTA-hapten PRIT system "proteus-DOTA" or "Pr." Herein we report the first results of radiochemistry development, radiopharmacology, and stoichiometry of tumor antigen binding, including the role of specific activity, anti-tumor efficacy, and normal tissue toxicity with the Pr-PRIT approach (as α-DOTA-PRIT). A series of α-DOTA-PRIT therapy studies were performed in three solid human cancer xenograft models of colorectal cancer (GPA33), breast cancer (HER2), and neuroblastoma (GD2), including evaluation of chronic toxicity at ~20 weeks of select survivors. Methods: Preliminary biodistribution experiments in SW1222 tumor-bearing mice revealed that 225Ac could not be efficiently pretargeted with current DOTA-Bn hapten utilized for 177Lu or 90Y, leading to poor tumor uptake in vivo. Therefore, we synthesized Pr consisting of an empty DOTA-chelate for 225Ac, tethered via a short polyethylene glycol linker to a lutetium-complexed DOTA for picomolar anti-DOTA chelate single-chain variable fragment (scFv) binding. Pr was radiolabeled with 225Ac and its imaging surrogate, 111In. In vitro studies verified anti-DOTA scFv recognition of [225Ac]Pr, and in vivo biodistribution and clearance studies were performed to evaluate hapten suitability and in vivo targeting efficiency. Results: Intravenously (i.v.) administered 225Ac- or 111In-radiolabeled Pr in mice showed rapid renal clearance and minimal normal tissue retention. In vivo pretargeting studies show high tumor accumulation of Pr (16.71 ± 5.11 %IA/g or 13.19 ± 3.88 %IA/g at 24 h p.i. for [225Ac]Pr and [111In]Pr, respectively) and relatively low uptake in normal tissues (all average ≤ 1.4 %IA/g at 24 h p.i.). Maximum tolerated dose (MTD) was not reached for either [225Ac]Pr alone or pretargeted [225Ac]Pr at administered activities up to 296 kBq/mouse. Single-cycle treatment consisting of α-DOTA-PRIT with either huA33-C825 bispecific anti-tumor/anti-DOTA-hapten antibody (BsAb), anti-HER2-C825 BsAb, or hu3F8-C825 BsAb for targeting GPA33, HER2, or GD2, respectively, was highly effective. In the GPA33 model, no complete responses (CRs) were observed but prolonged overall survival of treated animals was 42 d for α-DOTA-PRIT vs. 25 d for [225Ac]Pr only (P < 0.0001); for GD2, CRs (7/7, 100%) and histologic cures (4/7, 57%); and for HER2, CRs (7/19, 37%) and histologic cures (10/19, 56%) with no acute or chronic toxicity. Conclusions: [225Ac]Pr and its imaging biomarker [111In]Pr demonstrate optimal radiopharmacologic behavior for theranostic applications of α-DOTA-PRIT. For this initial evaluation of efficacy and toxicity, single-cycle treatment regimens were performed in all three systems. Histologic toxicity was not observed, so MTD was not observed. Prolonged overall survival, CRs, and histologic cures were observed in treated animals. In comparison to RIT with anti-tumor IgG antibodies, [225Ac]Pr has a much improved safety profile. Ultimately, these data will be used to guide clinical development of toxicity and efficacy studies of [225Ac]Pr, with the goal of delivering massive lethal doses of radiation to achieve a high probability of cure without toxicity.
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11
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Ahmed M, Lopez-Albaitero A, Pankov D, Santich BH, Liu H, Yan S, Xiang J, Wang P, Hasan AN, Selvakumar A, O'Reilly RJ, Liu C, Cheung NKV. TCR-mimic bispecific antibodies targeting LMP2A show potent activity against EBV malignancies. JCI Insight 2018; 3:97805. [PMID: 29467338 DOI: 10.1172/jci.insight.97805] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [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: 09/29/2017] [Accepted: 01/10/2018] [Indexed: 12/14/2022] Open
Abstract
EBV infection is associated with a number of malignancies of clinical unmet need, including Hodgkin lymphoma, nasopharyngeal carcinoma, gastric cancer, and posttransplant lymphoproliferative disease (PTLD), all of which express the EBV protein latent membrane protein 2A (LMP2A), an antigen that is difficult to target by conventional antibody approaches. To overcome this, we utilized phage display technology and a structure-guided selection strategy to generate human T cell receptor-like (TCR-like) monoclonal antibodies with exquisite specificity for the LMP2A-derived nonamer peptide, C426LGGLLTMV434 (CLG), as presented on HLA-A*02:01. Our lead construct, clone 38, closely mimics the native binding mode of a TCR, recognizing residues at position P3-P8 of the CLG peptide. To enhance antitumor potency, we constructed dimeric T cell engaging bispecific antibodies (DiBsAb) of clone 38 and an affinity-matured version clone 38-2. Both DiBsAb showed potent antitumor properties in vitro and in immunodeficient mice implanted with EBV transformed B lymphoblastoid cell lines and human T cell effectors. Clone 38 DiBsAb showed a stronger safety profile compared with its affinity-matured variant, with no activity against EBV- tumor cell lines and a panel of normal tissues, and was less cross-reactive against HLA-A*02:01 cells pulsed with a panel of CLG-like peptides predicted from a proteomic analysis. Clone 38 was also shown to recognize the CLG peptide on other HLA-A*02 suballeles, including HLA-A*02:02, HLA-A*02:04, and HLA-A*02:06, allowing for its potential use in additional populations. Clone 38 DiBsAb is a lead candidate to treat EBV malignancies with one of the strongest safety profiles documented for TCR-like mAbs.
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Affiliation(s)
- Mahiuddin Ahmed
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Andres Lopez-Albaitero
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Dmitry Pankov
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Brian H Santich
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Hong Liu
- Eureka Therapeutics, Emeryville, California, USA
| | - Su Yan
- Eureka Therapeutics, Emeryville, California, USA
| | - Jingyi Xiang
- Eureka Therapeutics, Emeryville, California, USA
| | - Pei Wang
- Eureka Therapeutics, Emeryville, California, USA
| | - Aisha N Hasan
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Annamalai Selvakumar
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Richard J O'Reilly
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Cheng Liu
- Eureka Therapeutics, Emeryville, California, USA
| | - Nai-Kong V Cheung
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York, USA
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12
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Goswami M, Prince G, Biancotto A, Moir S, Kardava L, Santich BH, Cheung F, Kotliarov Y, Chen J, Shi R, Zhou H, Golding H, Manischewitz J, King L, Kunz LM, Noonan K, Borrello IM, Smith BD, Hourigan CS. Impaired B cell immunity in acute myeloid leukemia patients after chemotherapy. J Transl Med 2017; 15:155. [PMID: 28693586 PMCID: PMC5504716 DOI: 10.1186/s12967-017-1252-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 06/21/2017] [Indexed: 12/31/2022] Open
Abstract
Background Changes in adaptive immune cells after chemotherapy in adult acute myeloid leukemia (AML) may have implications for the success of immunotherapy. This study was designed to determine the functional capacity of the immune system in adult patients with AML who have completed chemotherapy and are potential candidates for immunotherapy. Methods We used the response to seasonal influenza vaccination as a surrogate for the robustness of the immune system in 10 AML patients in a complete remission post-chemotherapy and performed genetic, phenotypic, and functional characterization of adaptive immune cell subsets. Results Only 2 patients generated protective titers in response to vaccination, and a majority of patients had abnormal frequencies of transitional and memory B-cells. B-cell receptor sequencing showed a B-cell repertoire with little evidence of somatic hypermutation in most patients. Conversely, frequencies of T-cell populations were similar to those seen in healthy controls, and cytotoxic T-cells demonstrated antigen-specific activity after vaccination. Effector T-cells had increased PD-1 expression in AML patients least removed from chemotherapy. Conclusion Our results suggest that while some aspects of cellular immunity recover quickly, humoral immunity is incompletely reconstituted in the year following intensive cytotoxic chemotherapy for AML. The observed B-cell abnormalities may explain the poor response to vaccination often seen in AML patients after chemotherapy. Furthermore, the uncoupled recovery of B-cell and T-cell immunity and increased PD-1 expression shortly after chemotherapy might have implications for the success of several modalities of immunotherapy. Electronic supplementary material The online version of this article (doi:10.1186/s12967-017-1252-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Meghali Goswami
- Myeloid Malignancies Section, Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, 10 Center Drive Room 10CRC 5-5216, Bethesda, MD, 20814-1476, USA.
| | | | - Angelique Biancotto
- Center for Human Immunology, Autoimmunity and Inflammation, National Institutes of Health, Bethesda, MD, USA
| | - Susan Moir
- National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Lela Kardava
- National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Brian H Santich
- National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Foo Cheung
- Center for Human Immunology, Autoimmunity and Inflammation, National Institutes of Health, Bethesda, MD, USA
| | - Yuri Kotliarov
- Center for Human Immunology, Autoimmunity and Inflammation, National Institutes of Health, Bethesda, MD, USA
| | - Jinguo Chen
- Center for Human Immunology, Autoimmunity and Inflammation, National Institutes of Health, Bethesda, MD, USA
| | - Rongye Shi
- Center for Human Immunology, Autoimmunity and Inflammation, National Institutes of Health, Bethesda, MD, USA
| | - Huizhi Zhou
- Center for Human Immunology, Autoimmunity and Inflammation, National Institutes of Health, Bethesda, MD, USA
| | - Hana Golding
- Division of Viral Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD, USA
| | - Jody Manischewitz
- Division of Viral Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD, USA
| | - Lisa King
- Division of Viral Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD, USA
| | - Lauren M Kunz
- Office of Biostatistics Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | | | | | | | - Christopher S Hourigan
- Myeloid Malignancies Section, Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, 10 Center Drive Room 10CRC 5-5216, Bethesda, MD, 20814-1476, USA
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13
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Cheng M, Santich BH, Xu H, Ahmed M, Huse M, Cheung NKV. Successful engineering of a highly potent single-chain variable-fragment (scFv) bispecific antibody to target disialoganglioside (GD2) positive tumors. Oncoimmunology 2016; 5:e1168557. [PMID: 27471647 PMCID: PMC4938304 DOI: 10.1080/2162402x.2016.1168557] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 03/11/2016] [Accepted: 03/14/2016] [Indexed: 01/28/2023] Open
Abstract
Engineering potent bispecific antibodies from single-chain variable fragments (scFv) remains difficult due to the inherent instability and insufficient binding of scFv's compared to their parental immunoglobulin format. Previously, we described a scFv-based bispecific antibody (scBA) against disialoganglioside (GD2) based on the anti-GD2 murine 5F11-scFv and the anti-CD3 huOKT3-scFv (5F11-scBA). In this study, we substituted the 5F11-scFv with the higher affinity (13-fold) hu3F8-scFv to form hu3F8-scBA. With this modification, hu3F8-scBA redirected T cells to kill GD2(+) cancer cell lines with up to 5,000-fold higher potency (femtomolar EC50) compared with 5F11-scBA (picomolar EC50) in cytotoxicity assays, even against target cells with low GD2 densities. Furthermore, hu3F8-scBA induced stronger T-cell activation than 5F11-scBA, as measured by Ca2+ flux and cytokine release. Additionally, in vivo, hu3F8-scBA suppressed tumor growth and prolonged mice survival much more effectively than 5F11-scBA, in both neuroblastoma and melanoma xenograft models. We conclude that the functional properties of scBA's can be increased substantially by relatively modest increases in antigen affinity.
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Affiliation(s)
- Ming Cheng
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center , New York, NY, USA
| | - Brian H Santich
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY, USA; Immunology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Hong Xu
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center , New York, NY, USA
| | - Mahiuddin Ahmed
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center , New York, NY, USA
| | - Morgan Huse
- Immunology Program, Memorial Sloan Kettering Cancer Center , New York, NY, USA
| | - Nai-Kong V Cheung
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center , New York, NY, USA
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14
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Cubas R, van Grevenynghe J, Wills S, Kardava L, Santich BH, Buckner CM, Muir R, Tardif V, Nichols C, Procopio F, He Z, Metcalf T, Ghneim K, Locci M, Ancuta P, Routy JP, Trautmann L, Li Y, McDermott AB, Koup RA, Petrovas C, Migueles SA, Connors M, Tomaras GD, Moir S, Crotty S, Haddad EK. Reversible Reprogramming of Circulating Memory T Follicular Helper Cell Function during Chronic HIV Infection. J Immunol 2015; 195:5625-36. [PMID: 26546609 DOI: 10.4049/jimmunol.1501524] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 10/06/2015] [Indexed: 11/19/2022]
Abstract
Despite the overwhelming benefits of antiretroviral therapy (ART) in curtailing viral load in HIV-infected individuals, ART does not fully restore cellular and humoral immunity. HIV-infected individuals under ART show reduced responses to vaccination and infections and are unable to mount an effective antiviral immune response upon ART cessation. Many factors contribute to these defects, including persistent inflammation, especially in lymphoid tissues, where T follicular helper (Tfh) cells instruct and help B cells launch an effective humoral immune response. In this study we investigated the phenotype and function of circulating memory Tfh cells as a surrogate of Tfh cells in lymph nodes and found significant impairment of this cell population in chronically HIV-infected individuals, leading to reduced B cell responses. We further show that these aberrant memory Tfh cells exhibit an IL-2-responsive gene signature and are more polarized toward a Th1 phenotype. Treatment of functional memory Tfh cells with IL-2 was able to recapitulate the detrimental reprogramming. Importantly, this defect was reversible, as interfering with the IL-2 signaling pathway helped reverse the abnormal differentiation and improved Ab responses. Thus, reversible reprogramming of memory Tfh cells in HIV-infected individuals could be used to enhance Ab responses. Altered microenvironmental conditions in lymphoid tissues leading to altered Tfh cell differentiation could provide one explanation for the poor responsiveness of HIV-infected individuals to new Ags. This explanation has important implications for the development of therapeutic interventions to enhance HIV- and vaccine-mediated Ab responses in patients under ART.
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Affiliation(s)
- Rafael Cubas
- Vaccine and Gene Therapy Institute of Florida, Port St. Lucie, FL 34987
| | - Julien van Grevenynghe
- Institut National de la Recherche Scientifique, Institut Armand-Frappier, Laval H7V 1B7, Quebec, Canada
| | - Saintedym Wills
- Department of Immunology and the Duke Human Vaccine Institute, Duke University, Durham, NC 27710
| | - Lela Kardava
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Brian H Santich
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Clarisa M Buckner
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Roshell Muir
- Vaccine and Gene Therapy Institute of Florida, Port St. Lucie, FL 34987
| | - Virginie Tardif
- Vaccine and Gene Therapy Institute of Florida, Port St. Lucie, FL 34987
| | - Carmen Nichols
- Vaccine and Gene Therapy Institute of Florida, Port St. Lucie, FL 34987
| | - Francesco Procopio
- Service d'Immunologie et Allergie, Centre Hospitalier Universitaire Vaudois, 1011 Lausanne, Switzerland
| | - Zhong He
- Vaccine and Gene Therapy Institute of Florida, Port St. Lucie, FL 34987
| | - Talibah Metcalf
- Vaccine and Gene Therapy Institute of Florida, Port St. Lucie, FL 34987
| | - Khader Ghneim
- Vaccine and Gene Therapy Institute of Florida, Port St. Lucie, FL 34987
| | - Michela Locci
- Division of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, CA 92037
| | - Petronella Ancuta
- Department of Medicine, University of Montreal, Montreal, Quebec H3C 3J7, Canada; Department of Microbiology, Infectiology and Immunology, Faculty of Medicine, University of Montreal, Montreal, Quebec H3C 3J7, Canada
| | - Jean-Pierre Routy
- Chronic Viral Illness Service, McGill University Health Centre, Montreal, Quebec H3H 2R9, Canada; Research Institute, McGill University Health Centre, Montreal, Quebec H3H 2R9, Canada; Division of Hematology, McGill University Health Centre, Montreal, Quebec H3H 2R9, Canada
| | - Lydie Trautmann
- Vaccine and Gene Therapy Institute of Florida, Port St. Lucie, FL 34987
| | - Yuxing Li
- International AIDS Vaccine Initiative Neutralizing Antibody Center, The Scripps Research Institute, La Jolla, CA 92037; Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037
| | - Adrian B McDermott
- Immunology Laboratory, Vaccine Research Center, National Institute for Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Rick A Koup
- Immunology Laboratory, Vaccine Research Center, National Institute for Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Constantinos Petrovas
- Immunology Laboratory, Vaccine Research Center, National Institute for Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Steven A Migueles
- HIV-Specific Immunity Section, Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Mark Connors
- HIV-Specific Immunity Section, Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Georgia D Tomaras
- Department of Immunology and the Duke Human Vaccine Institute, Duke University, Durham, NC 27710
| | - Susan Moir
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Shane Crotty
- Division of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, CA 92037; Department of Medicine, School of Medicine, University of California, San Diego, La Jolla, CA 92093; and Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery, La Jolla, CA 92037
| | - Elias K Haddad
- Vaccine and Gene Therapy Institute of Florida, Port St. Lucie, FL 34987;
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15
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Montezuma-Rusca JM, Moir S, Kardava L, Buckner CM, Louie A, Kim LJY, Santich BH, Wang W, Fankuchen OR, Diaz G, Daub JR, Rosenzweig SD, Chun TW, Li Y, Braylan RC, Calvo KR, Fauci AS. Bone marrow plasma cells are a primary source of serum HIV-1-specific antibodies in chronically infected individuals. J Immunol 2015; 194:2561-8. [PMID: 25681347 DOI: 10.4049/jimmunol.1402424] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Several potent and broadly neutralizing Abs to HIV-1 have been isolated recently from peripheral blood B cells of infected individuals, based on prescreening of Ab activity in the serum. However, little is known regarding the cells that make the Abs that circulate in the blood. Accordingly, we investigated the most likely source, the bone marrow, of chronically HIV-1-infected individuals who were not receiving antiretroviral therapy. Increased frequencies of plasma cells, as well as B cell precursors, namely preB-I and preB-II, and decreased frequencies of mature B cells were observed in bone marrow aspirates of these individuals compared with HIV-negative counterparts. Increased frequencies of bone marrow plasma cells are consistent with known hallmarks of HIV-1 infection, namely hypergammaglobulinemia and increased frequencies of peripheral blood plasmablasts. Levels of HIV-1 envelope (Env)-binding and HIV-1-neutralizing Abs were measured in serum, and corresponding frequencies of Ab-secreting or Env-binding cells were measured in the blood (plasmablasts and memory B cells) and in the bone marrow (plasma cells). A strong correlation was observed between serum HIV-1-specific Abs and Env-specific bone marrow-derived plasma cells, but not circulating plasmablasts or memory B cells. These findings demonstrate that, despite HIV-1-induced phenotypic and functional B cell dysregulation in the peripheral blood and secondary lymphoid tissues, bone marrow plasma cells remain a primary source for circulating HIV-1-specific Abs in HIV-1-infected individuals.
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Affiliation(s)
- Jairo M Montezuma-Rusca
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Susan Moir
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892;
| | - Lela Kardava
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Clarisa M Buckner
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Aaron Louie
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Leo J Y Kim
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Brian H Santich
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Wei Wang
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Olivia R Fankuchen
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Gabriella Diaz
- Clinical Research Directorate/Clinical Monitoring Research Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702
| | - Janine R Daub
- Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Sergio D Rosenzweig
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892
| | - Tae-Wook Chun
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Yuxing Li
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892; International AIDS Vaccine Initiative Neutralizing Antibody Center, The Scripps Research Institute, La Jolla, CA 92037; and Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037
| | - Raul C Braylan
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892
| | - Katherine R Calvo
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892
| | - Anthony S Fauci
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
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16
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Abstract
The adaptive immune response against cancer consists of two arms: the humoral response from B cells, and the cell-mediated response from T cells. The humoral response has the advantage of diversity, theoretically recognizing antigens of any type (sugar, protein, lipid, etc.), but is generally limited to surface-expressed targets. T cells on the other hand, can recognize intracellular targets, but only if they are proteins, and presented as small peptide fragments on major histocompatibility complex (MHC) cell surface antigens. However, with advances in protein engineering and phage display, it has become feasible to quickly identify and generate antibodies or single-chain variable fragments against peptide-MHC, thus bridging the two arms, and allowing for recognition, identification, and effector responses against cells expressing intracellular targets.
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Affiliation(s)
- Brian H Santich
- Gerstner Sloan Kettering Graduate School of Biomedical Sciences, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, NY, 10065, USA.
| | - Hong Liu
- Eureka Therapeutics, Emeryville, CA, USA
| | - Cheng Liu
- Eureka Therapeutics, Emeryville, CA, USA
| | - Nai-Kong V Cheung
- Gerstner Sloan Kettering Graduate School of Biomedical Sciences, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, NY, 10065, USA.,Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
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17
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Kardava L, Moir S, Shah N, Wang W, Wilson R, Buckner CM, Santich BH, Kim LJY, Spurlin EE, Nelson AK, Wheatley AK, Harvey CJ, McDermott AB, Wucherpfennig KW, Chun TW, Tsang JS, Li Y, Fauci AS. Abnormal B cell memory subsets dominate HIV-specific responses in infected individuals. J Clin Invest 2014; 124:3252-62. [PMID: 24892810 DOI: 10.1172/jci74351] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Accepted: 04/10/2014] [Indexed: 11/17/2022] Open
Abstract
Recently, several neutralizing anti-HIV antibodies have been isolated from memory B cells of HIV-infected individuals. Despite extensive evidence of B cell dysfunction in HIV disease, little is known about the cells from which these rare HIV-specific antibodies originate. Accordingly, we used HIV envelope gp140 and CD4 or coreceptor (CoR) binding site (bs) mutant probes to evaluate HIV-specific responses in peripheral blood B cells of HIV-infected individuals at various stages of infection. In contrast to non-HIV responses, HIV-specific responses against gp140 were enriched within abnormal B cells, namely activated and exhausted memory subsets, which are largely absent in the blood of uninfected individuals. Responses against the CoRbs, which is a poorly neutralizing epitope, arose early, whereas those against the well-characterized neutralizing epitope CD4bs were delayed and infrequent. Enrichment of the HIV-specific response within resting memory B cells, the predominant subset in uninfected individuals, did occur in certain infected individuals who maintained low levels of plasma viremia and immune activation with or without antiretroviral therapy. The distribution of HIV-specific responses among memory B cell subsets was corroborated by transcriptional analyses. Taken together, our findings provide valuable insight into virus-specific B cell responses in HIV infection and demonstrate that memory B cell abnormalities may contribute to the ineffectiveness of the antibody response in infected individuals.
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18
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Buckner CM, Moir S, Kardava L, Ho J, Santich BH, Kim LJY, Funk EK, Nelson AK, Winckler B, Chairez CL, Theobald-Whiting NL, Anaya-O'Brien S, Alimchandani M, Quezado MM, Yao MD, Kovacs JA, Chun TW, Fauci AS, Malech HL, De Ravin SS. CXCR4/IgG-expressing plasma cells are associated with human gastrointestinal tissue inflammation. J Allergy Clin Immunol 2013; 133:1676-85.e5. [PMID: 24373354 DOI: 10.1016/j.jaci.2013.10.050] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [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: 06/28/2013] [Revised: 09/16/2013] [Accepted: 10/14/2013] [Indexed: 12/30/2022]
Abstract
BACKGROUND We previously reported abnormalities in circulating B cells in patients with chronic granulomatous disease (CGD) and those with HIV infection. Gastrointestinal complications are common to both diseases and likely involve perturbation of immune cells, including plasma cells (PCs). IgA is the most abundant immunoglobulin in the human body, with roles in protection and maintenance of intestinal homeostasis. IgA is produced primarily by PCs residing in mucosal tissues that are also thought to circulate in the blood. OBJECTIVE We sought to characterize and compare PCs in patients with infectious (HIV) and noninfectious (CGD and Crohn disease) diseases that have been associated with intestinal inflammation. METHODS Phenotypic and transcriptional analyses were performed on cells isolated from the blood and colon. RESULTS IgA-secreting CCR10-expressing PCs predominated in the guts of healthy subjects, whereas in patients with HIV, CGD, and Crohn disease, there was a significant increase in the proportion of IgG-secreting PCs. Where intestinal inflammation was present, IgG-secreting PCs expressed reduced levels of CCR10 and increased levels of CXCR4. The intensity of CXCR4 expression correlated with the frequency of IgG-expressing PCs and the frequency of CXCR4(+)/IgG(+) PCs was associated with the severity of intestinal inflammatory disease yet distinct from PCs and plasmablasts circulating in the blood. CONCLUSIONS These findings suggest that regardless of the underlying disease, the presence of CXCR4(+)/IgG(+) PCs in the gut is a strong yet localized indicator of intestinal inflammation. Furthermore, our findings suggest that CXCR4(+)/IgG(+) PCs might play a role in immune cell homeostasis during inflammatory processes of the gut.
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Affiliation(s)
- Clarisa M Buckner
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Susan Moir
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md.
| | - Lela Kardava
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Jason Ho
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Brian H Santich
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Leo Jin Young Kim
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Emily K Funk
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Amy K Nelson
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Britanny Winckler
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Cheryl L Chairez
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Narda L Theobald-Whiting
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Sandra Anaya-O'Brien
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | | | - Martha M Quezado
- Laboratory of Pathology, National Cancer Institute, Bethesda, Md
| | - Michael D Yao
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Joseph A Kovacs
- Critical Care Medicine, National Institutes of Health Clinical Center, Bethesda, Md
| | - Tae-Wook Chun
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Anthony S Fauci
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Harry L Malech
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, Bethesda, Md
| | - Suk See De Ravin
- Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, Bethesda, Md.
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19
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Zhou Q, Lee GS, Brady J, Datta S, Katan M, Sheikh A, Martins MS, Bunney TD, Santich BH, Moir S, Kuhns DB, Long Priel DA, Ombrello A, Stone D, Ombrello MJ, Khan J, Milner JD, Kastner DL, Aksentijevich I. A hypermorphic missense mutation in PLCG2, encoding phospholipase Cγ2, causes a dominantly inherited autoinflammatory disease with immunodeficiency. Am J Hum Genet 2012; 91:713-20. [PMID: 23000145 DOI: 10.1016/j.ajhg.2012.08.006] [Citation(s) in RCA: 239] [Impact Index Per Article: 19.9] [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: 02/23/2012] [Revised: 06/11/2012] [Accepted: 08/08/2012] [Indexed: 12/13/2022] Open
Abstract
Whole-exome sequencing was performed in a family affected by dominantly inherited inflammatory disease characterized by recurrent blistering skin lesions, bronchiolitis, arthralgia, ocular inflammation, enterocolitis, absence of autoantibodies, and mild immunodeficiency. Exome data from three samples, including the affected father and daughter and unaffected mother, were filtered for the exclusion of reported variants, along with benign variants, as determined by PolyPhen-2. A total of eight transcripts were identified as possible candidate genes. We confirmed a variant, c.2120C>A (p.Ser707Tyr), within PLCG2 as the only de novo variant that was present in two affected family members and not present in four unaffected members. PLCG2 encodes phospholipase Cγ2 (PLCγ2), an enzyme with a critical regulatory role in various immune and inflammatory pathways. The p.Ser707Tyr substitution is located in an autoinhibitory SH2 domain that is crucial for PLCγ2 activation. Overexpression of the altered p.Ser707Tyr protein and ex vivo experiments using affected individuals' leukocytes showed clearly enhanced PLCγ2 activity, suggesting increased intracellular signaling in the PLCγ2-mediated pathway. Recently, our laboratory identified in individuals with cold-induced urticaria and immune dysregulation PLCG2 exon-skipping mutations resulting in protein products with constitutive phospholipase activity but with reduced intracellular signaling at physiological temperatures. In contrast, the p.Ser707Tyr substitution in PLCγ2 causes a distinct inflammatory phenotype that is not provoked by cold temperatures and that has different end-organ involvement and increased intracellular signaling at physiological temperatures. Our results highlight the utility of exome-sequencing technology in finding causal mutations in nuclear families with dominantly inherited traits otherwise intractable by linkage analysis.
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Affiliation(s)
- Qing Zhou
- Inflammatory Disease Section, National Human Genome Research Institute, Bethesda, MD 20892, USA
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20
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Zompi S, Santich BH, Beatty PR, Harris E. Protection from secondary dengue virus infection in a mouse model reveals the role of serotype cross-reactive B and T cells. J Immunol 2011; 188:404-16. [PMID: 22131327 DOI: 10.4049/jimmunol.1102124] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The four dengue virus (DENV) serotypes cause dengue fever and dengue hemorrhagic fever/dengue shock syndrome. Although severe disease has been associated with heterotypic secondary DENV infection, most secondary DENV infections are asymptomatic or result in classic DF. The role of cross-reactive immunity in mediating cross-protection against secondary heterotypic DENV infection is not well understood. DENV infection of IFN-α/β and IFN-γ receptor-deficient (AG129) mice reproduces key features of human disease. We previously demonstrated a role in cross-protection for pre-existing cross-reactive Abs, maintained by long-lived plasma cells. In this study, we use a sequential infection model, infecting AG129 mice with DENV-1, followed by DENV-2 6-8 wk later. We find that increased DENV-specific avidity during acute secondary heterotypic infection is mediated by cross-reactive memory B cells, as evidenced by increased numbers of DENV-1-specific cells by ELISPOT and higher avidity against DENV-1 of supernatants from polyclonally stimulated splenocytes isolated from mice experiencing secondary DENV-2 infection. However, increased DENV-specific avidity is not associated with increased DENV-specific neutralization, which appears to be mediated by naive B cells. Adoptive transfer of DENV-1-immune B and T cells into naive mice prior to secondary DENV-2 infection delayed mortality. Mice depleted of T cells developed signs of disease, but recovered after secondary DENV infection. Overall, we found that protective cross-reactive Abs are secreted by both long-lived plasma cells and memory B cells and that both cross-reactive B cells and T cells provide protection against a secondary heterotypic DENV infection. Understanding the protective immunity that develops naturally against DENV infection may help design future vaccines.
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Affiliation(s)
- Simona Zompi
- School of Public Health, University of California, Berkeley, CA 94720-7354, USA.
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