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Goswami R, Gupta A, Bednova O, Coulombe G, Patel D, Rotello VM, Leyton JV. Nuclear localization signal-tagged systems: relevant nuclear import principles in the context of current therapeutic design. Chem Soc Rev 2024; 53:204-226. [PMID: 38031452 PMCID: PMC10798298 DOI: 10.1039/d1cs00269d] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2023]
Abstract
Nuclear targeting of therapeutics provides a strategy for enhancing efficacy of molecules active in the nucleus and minimizing off-target effects. 'Active' nuclear-directed transport and efficient translocations across nuclear pore complexes provide the most effective means of maximizing nuclear localization. Nuclear-targeting systems based on nuclear localization signal (NLS) motifs have progressed significantly since the beginning of the current millennium. Here, we offer a roadmap for understanding the basic mechanisms of nuclear import in the context of actionable therapeutic design for developing NLS-therapeutics with improved treatment efficacy.
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Affiliation(s)
- Ritabrita Goswami
- Department of Chemistry, University of Massachusetts, Massachusetts, USA.
| | - Aarohi Gupta
- Department of Chemistry, University of Massachusetts, Massachusetts, USA.
| | - Olga Bednova
- Département de médecine nucléaire et radiobiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Québec, Canada
| | - Gaël Coulombe
- Service des stages et du développement professionnel, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Dipika Patel
- Service des stages et du développement professionnel, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Vincent M Rotello
- Department of Chemistry, University of Massachusetts, Massachusetts, USA.
| | - Jeffrey V Leyton
- École des sciences pharmaceutiques, Université d'Ottawa, Ottawa, Ontario, Canada.
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada
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El-Kadiry AEH, Beaudoin S, Plouffe S, Rafei M. Accum™ Technology: A Novel Conjugable Primer for Onco-Immunotherapy. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27123807. [PMID: 35744930 PMCID: PMC9227040 DOI: 10.3390/molecules27123807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 06/10/2022] [Accepted: 06/11/2022] [Indexed: 11/20/2022]
Abstract
Compromised activity is a common impediment for biologics requiring endosome trafficking into target cells. In cancer cells, antibody-drug conjugates (ADCs) are trapped in endosomes or subsequently pumped extracellularly, leading to a reduction in intracellular accumulation. In subsets of dendritic cells (DCs), endosome-engulfed antigens face non-specific proteolysis and collateral damage to epitope immunogenicity before proteasomal processing and subsequent surface presentation. To bypass these shortcomings, we devised Accum™, a conjugable biotechnology harboring cholic acid (ChAc) and a nuclear localization signal (NLS) sequence for endosome escape and prompt nuclear targeting. Combined, these mechanisms culminate in enhanced intracellular accumulation and functionalization of coupled biologics. As proof-of-principle, we have biochemically characterized Accum, demonstrating its adaptability to ADCs or antigens in different cancer settings. Additionally, we have validated that endosome escape and nuclear routing are indispensable for effective intracellular accumulation and guaranteed target cell selectivity. Importantly, we have demonstrated that the unique mechanism of action of Accum translates into enhanced tumor cytotoxicity when coupled to ADCs, and durable therapeutic and prophylactic anti-cancer immunogenicity when coupled to tumor antigens. As more pre-clinical evidence accumulates, the adaptability, unique mechanism of action, and high therapeutic potency of Accum signal a promising transition into clinical investigations in the context of onco-immunotherapy.
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Affiliation(s)
- Abed El-Hakim El-Kadiry
- Department of Pharmacology and Physiology, Université de Montréal, Montreal, QC H3T 1J4, Canada;
| | - Simon Beaudoin
- Defence Therapeutics Inc., Research and Development Branch, Vancouver, BC V6C 3L6, Canada; (S.B.); (S.P.)
| | - Sebastien Plouffe
- Defence Therapeutics Inc., Research and Development Branch, Vancouver, BC V6C 3L6, Canada; (S.B.); (S.P.)
| | - Moutih Rafei
- Department of Pharmacology and Physiology, Université de Montréal, Montreal, QC H3T 1J4, Canada;
- Department of Microbiology, Infectious Diseases and Immunology, Université de Montréal, Montreal, QC H3T 1J4, Canada
- Molecular Biology Program, Université de Montréal, Montreal, QC H3T 1J4, Canada
- Correspondence: ; Tel.: +1-(514)-343-6931
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Bonnevaux H, Guerif S, Albrecht J, Jouannot E, De Gallier T, Beil C, Lange C, Leuschner WD, Schneider M, Lemoine C, Caron A, Amara C, Barrière C, Siavellis J, Bardet V, Luna E, Agrawal P, Drake DR, Rao E, Wonerow P, Carrez C, Blanc V, Hsu K, Wiederschain D, Fraenkel PG, Virone-Oddos A. Pre-clinical development of a novel CD3-CD123 bispecific T-cell engager using cross-over dual-variable domain (CODV) format for acute myeloid leukemia (AML) treatment. Oncoimmunology 2021; 10:1945803. [PMID: 34484869 PMCID: PMC8409758 DOI: 10.1080/2162402x.2021.1945803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Novel therapies are needed for effective treatment of AML. In the relapsed setting, prognosis is very poor despite salvage treatment with chemotherapy. Evidence suggests that leukemic stem cells (LSCs) cause relapse. The cell surface receptor CD123 is highly expressed in blast cells and LSCs from AML patients and is a potential therapeutic target. CD123 cross-over dual-variable domain T-cell engager (CD123-CODV-TCE) is a bispecific antibody with an innovative format. One arm targets the CD3εδ subunit of T-cell co-receptors on the surface of T cells, while the other targets CD123 on malignant cells, leading to cell-specific cytotoxic activity. Here, we describe the preclinical activity of CD123-CODV-TCE. CD123-CODV-TCE effectively binds to human and cynomolgus monkey CD3 and CD123 and is a highly potent T-cell engager. It mediates T-cell activation and T-cell-directed killing of AML cells in vitro. In vivo, CD123-CODV-TCE suppresses AML tumor growth in leukemia xenograft mouse models, where it achieves an effective half-life of 3.2 days, which is a significantly longer half-life compared to other bispecific antibodies with no associated Fc fragment. The in vitro safety profile is as expected for compounds with similar modes of action. These results suggest that CD123-CODV-TCE may be a promising therapy for patients with relapsed/refractory AML.
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Affiliation(s)
- Hélène Bonnevaux
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Stephane Guerif
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Jana Albrecht
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Erwan Jouannot
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Thibaud De Gallier
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Christian Beil
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Christian Lange
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Wulf Dirk Leuschner
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Marion Schneider
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Cendrine Lemoine
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Anne Caron
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Céline Amara
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Cédric Barrière
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Justine Siavellis
- Hopitaux Universitaires Paris Ile De France Ouest, Université Versailles Saint Quentin, Paris, France
| | - Valérie Bardet
- Hopitaux Universitaires Paris Ile De France Ouest, Université Versailles Saint Quentin, Paris, France
| | | | | | | | - Ercole Rao
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Peter Wonerow
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Chantal Carrez
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Véronique Blanc
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Karl Hsu
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Dmitri Wiederschain
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Paula G Fraenkel
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
| | - Angéla Virone-Oddos
- Sanofi R&D, Vitry-sur-Seine, France; Frankfurt, Germany; and Cambridge, MA, USA
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Ku A, Facca VJ, Cai Z, Reilly RM. Auger electrons for cancer therapy - a review. EJNMMI Radiopharm Chem 2019; 4:27. [PMID: 31659527 PMCID: PMC6800417 DOI: 10.1186/s41181-019-0075-2] [Citation(s) in RCA: 167] [Impact Index Per Article: 33.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 08/28/2019] [Indexed: 12/23/2022] Open
Abstract
Background Auger electrons (AEs) are very low energy electrons that are emitted by radionuclides that decay by electron capture (e.g. 111In, 67Ga, 99mTc, 195mPt, 125I and 123I). This energy is deposited over nanometre-micrometre distances, resulting in high linear energy transfer (LET) that is potent for causing lethal damage in cancer cells. Thus, AE-emitting radiotherapeutic agents have great potential for treatment of cancer. In this review, we describe the radiobiological properties of AEs, their radiation dosimetry, radiolabelling methods, and preclinical and clinical studies that have been performed to investigate AEs for cancer treatment. Results AEs are most lethal to cancer cells when emitted near the cell nucleus and especially when incorporated into DNA (e.g. 125I-IUdR). AEs cause DNA damage both directly and indirectly via water radiolysis. AEs can also kill targeted cancer cells by damaging the cell membrane, and kill non-targeted cells through a cross-dose or bystander effect. The radiation dosimetry of AEs considers both organ doses and cellular doses. The Medical Internal Radiation Dose (MIRD) schema may be applied. Radiolabelling methods for complexing AE-emitters to biomolecules (antibodies and peptides) and nanoparticles include radioiodination (125I and 123I) or radiometal chelation (111In, 67Ga, 99mTc). Cancer cells exposed in vitro to AE-emitting radiotherapeutic agents exhibit decreased clonogenic survival correlated at least in part with unrepaired DNA double-strand breaks (DSBs) detected by immunofluorescence for γH2AX, and chromosomal aberrations. Preclinical studies of AE-emitting radiotherapeutic agents have shown strong tumour growth inhibition in vivo in tumour xenograft mouse models. Minimal normal tissue toxicity was found due to the restricted toxicity of AEs mostly on tumour cells targeted by the radiotherapeutic agents. Clinical studies of AEs for cancer treatment have been limited but some encouraging results were obtained in early studies using 111In-DTPA-octreotide and 125I-IUdR, in which tumour remissions were achieved in several patients at administered amounts that caused low normal tissue toxicity, as well as promising improvements in the survival of glioblastoma patients with 125I-mAb 425, with minimal normal tissue toxicity. Conclusions Proof-of-principle for AE radiotherapy of cancer has been shown preclinically, and clinically in a limited number of studies. The recent introduction of many biologically-targeted therapies for cancer creates new opportunities to design novel AE-emitting agents for cancer treatment. Pierre Auger did not conceive of the application of AEs for targeted cancer treatment, but this is a tremendously exciting future that we and many other scientists in this field envision.
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Affiliation(s)
- Anthony Ku
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada
| | - Valerie J Facca
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada
| | - Zhongli Cai
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada
| | - Raymond M Reilly
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada. .,Department of Medical Imaging, University of Toronto, Toronto, ON, Canada. .,Joint Department of Medical Imaging and Toronto General Research Institute, University Health Network, Toronto, ON, Canada. .,Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College St., Toronto, ON, M5S 3M2, Canada.
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Shang Y, Zhou F. Current Advances in Immunotherapy for Acute Leukemia: An Overview of Antibody, Chimeric Antigen Receptor, Immune Checkpoint, and Natural Killer. Front Oncol 2019; 9:917. [PMID: 31616632 PMCID: PMC6763689 DOI: 10.3389/fonc.2019.00917] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 09/03/2019] [Indexed: 12/13/2022] Open
Abstract
Recently, due to the application of hematopoietic stem cell transplantation and small molecule inhibitor, the survival of acute leukemia is prolonged. However, the 5 year survival rate remains low due to a high incidence of relapse. Immunotherapy is expected to improve the prognosis of patients with relapsed or refractory hematological malignancies because it does not rely on the cytotoxic mechanisms of conventional therapy. In this paper, the advances of immunotherapy in acute leukemia are reviewed from the aspects of Antibody including Unconjugated antibodies, Antibody-drug conjugate and Bispecific antibody, Chimeric Antigen Receptor (CARs), Immune checkpoint, Natural killer cells. The immunological features, mechanisms and limitation in clinic will be described.
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Affiliation(s)
- Yufeng Shang
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Fuling Zhou
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan, China
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Williams BA, Law A, Hunyadkurti J, Desilets S, Leyton JV, Keating A. Antibody Therapies for Acute Myeloid Leukemia: Unconjugated, Toxin-Conjugated, Radio-Conjugated and Multivalent Formats. J Clin Med 2019; 8:E1261. [PMID: 31434267 PMCID: PMC6723634 DOI: 10.3390/jcm8081261] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/13/2019] [Accepted: 08/16/2019] [Indexed: 12/21/2022] Open
Abstract
In recent decades, therapy for acute myeloid leukemia (AML) has remained relatively unchanged, with chemotherapy regimens primarily consisting of an induction regimen based on a daunorubicin and cytarabine backbone, followed by consolidation chemotherapy. Patients who are relapsed or refractory can be treated with allogeneic hematopoietic stem-cell transplantation with modest benefits to event-free and overall survival. Other modalities of immunotherapy include antibody therapies, which hold considerable promise and can be categorized into unconjugated classical antibodies, multivalent recombinant antibodies (bi-, tri- and quad-specific), toxin-conjugated antibodies and radio-conjugated antibodies. While unconjugated antibodies can facilitate Natural Killer (NK) cell antibody-dependent cell-mediated cytotoxicity (ADCC), bi- and tri-specific antibodies can engage either NK cells or T-cells to redirect cytotoxicity against AML targets in a highly efficient manner, similarly to classic ADCC. Finally, toxin-conjugated and radio-conjugated antibodies can increase the potency of antibody therapies. Several AML tumour-associated antigens are at the forefront of targeted therapy development, which include CD33, CD123, CD13, CLL-1 and CD38 and which may be present on both AML blasts and leukemic stem cells. This review focused on antibody therapies for AML, including pre-clinical studies of these agents and those that are either entering or have been tested in early phase clinical trials. Antibodies for checkpoint inhibition and microenvironment targeting in AML were excluded from this review.
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Affiliation(s)
- Brent A Williams
- Cell Therapy Program, Princess Margaret Cancer Centre, Toronto, ON M5G 2C1, Canada.
| | - Arjun Law
- Hans Messner Allogeneic Blood and Marrow Transplant Program, Princess Margaret Cancer Centre, Toronto, ON M5G 2C1, Canada
| | - Judit Hunyadkurti
- Département de medécine nucléaire et radiobiology, Faculté de medécine et des sciences de la santé, Centre hospitalier universitaire de Sherbrooke (CHUS), Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada
| | | | - Jeffrey V Leyton
- Département de medécine nucléaire et radiobiology, Faculté de medécine et des sciences de la santé, Centre hospitalier universitaire de Sherbrooke (CHUS), Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada
- Sherbrooke Molecular Imaging Centre, Centre de recherche du CHUS, Sherbrooke, QC J1H 5N4, Canada
- Institute de pharmacologie de Sherbrooke, Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada
| | - Armand Keating
- Cell Therapy Program, Princess Margaret Cancer Centre, Toronto, ON M5G 2C1, Canada
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7
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Aghevlian S, Boyle AJ, Reilly RM. Radioimmunotherapy of cancer with high linear energy transfer (LET) radiation delivered by radionuclides emitting α-particles or Auger electrons. Adv Drug Deliv Rev 2017; 109:102-118. [PMID: 26705852 DOI: 10.1016/j.addr.2015.12.003] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 11/26/2015] [Accepted: 12/06/2015] [Indexed: 12/31/2022]
Abstract
Radioimmunotherapy (RIT) aims to selectively deliver radionuclides emitting α-particles, β-particles or Auger electrons to tumors by conjugation to monoclonal antibodies (mAbs) that recognize tumor-associated antigens/receptors. The approach has been most successful for treatment of non-Hodgkin's B-cell lymphoma but challenges have been encountered in extending these promising results to the treatment of solid malignancies. These challenges include the low potency of β-particle emitters such as 131I, 177Lu or 90Y which have been commonly conjugated to the mAbs, due to their low linear energy transfer (LET=0.1-1.0keV/μm). Furthermore, since the β-particles have a 2-10mm range, there has been dose-limiting non-specific toxicity to hematopoietic stem cells in the bone marrow (BM) due to the cross-fire effect. Conjugation of mAbs to α-particle-emitters (e.g. 225Ac, 213Bi, 212Pb or 211At) or Auger electron-emitters (e.g. 111In, 67Ga, 123I or 125I) would increase the potency of RIT due to their high LET (50-230keV/μm and 4 to 26keV/μm, respectively). In addition, α-particles have a range in tissues of 28-100μm and Auger electrons are nanometer in range which greatly reduces or eliminates the cross-fire effect compared to β-particles, potentially reducing their non-specific toxicity to the BM. In this review, we describe the results of preclinical and clinical studies of RIT of cancer using radioimmunoconjugates emitting α-particles or Auger electrons, and discuss the potential of these high LET forms of radiation to improve the outcome of cancer patients.
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Affiliation(s)
- Sadaf Aghevlian
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada
| | - Amanda J Boyle
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada
| | - Raymond M Reilly
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada; Department of Medical Imaging, University of Toronto, Toronto, ON, Canada; Toronto General Research Institute and Joint Department of Medical Imaging, University Health Network, Toronto, ON, Canada.
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8
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Bergstrom D, Leyton JV, Zereshkian A, Chan C, Cai Z, Reilly RM. Paradoxical effects of Auger electron-emitting 111 In-DTPA-NLS-CSL360 radioimmunoconjugates on hCD45 + cells in the bone marrow and spleen of leukemia-engrafted NOD/SCID or NRG mice. Nucl Med Biol 2016; 43:635-41. [DOI: 10.1016/j.nucmedbio.2016.07.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Accepted: 07/19/2016] [Indexed: 02/07/2023]
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Beaudoin S, Rondeau A, Martel O, Bonin MA, van Lier JE, Leyton JV. ChAcNLS, a Novel Modification to Antibody-Conjugates Permitting Target Cell-Specific Endosomal Escape, Localization to the Nucleus, and Enhanced Total Intracellular Accumulation. Mol Pharm 2016; 13:1915-26. [PMID: 27112376 DOI: 10.1021/acs.molpharmaceut.6b00075] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The design of antibody-conjugates (ACs) for delivering molecules for targeted applications in humans has sufficiently progressed to demonstrate clinical efficacy in certain malignancies and reduced systemic toxicity that occurs with standard nontargeted therapies. One area that can advance clinical success for ACs will be to increase their intracellular accumulation. However, entrapment and degradation in the endosomal-lysosomal pathway, on which ACs are reliant for the depositing of their molecular payload inside target cells, leads to reduced intracellular accumulation. Innovative approaches that can manipulate this pathway may provide a strategy for increasing accumulation. We hypothesized that escape from entrapment inside the endosomal-lysosomal pathway and redirected trafficking to the nucleus could be an effective approach to increase intracellular AC accumulation in target cells. Cholic acid (ChAc) was coupled to the peptide CGYGPKKKRKVGG containing the nuclear localization sequence (NLS) from SV-40 large T-antigen, which is termed ChAcNLS. ChAcNLS was conjugated to the mAb 7G3 (7G3-ChAcNLS), which has nanomolar affinity for the cell-surface leukemic antigen interleukin-3 receptor-α (IL-3Rα). Our aim was to determine whether 7G3-ChAcNLS increased intracellular accumulation while retaining nanomolar affinity and IL-3Rα-positive cell selectivity. Competition ELISA and cell treatment assays were performed. Cell fractionation, confocal microscopy, flow cytometry, and Western blot techniques were used to determine the level of antibody accumulation inside cells and in corresponding nuclei. In addition, the radioisotope copper-64 ((64)Cu) was also utilized as a surrogate molecular cargo to evaluate nuclear and intracellular accumulation by radioactivity counting. 7G3-ChAcNLS effectively escaped endosome entrapment and degradation resulting in a unique intracellular distribution pattern. mAb modification with ChAcNLS maintained 7G3 nM affinity and produced high selectivity for IL-3Rα-positive cells. In contrast, 7G3 ACs with the ability to either escape endosome entrapment or traffic to the nucleus was not superior to 7G3-ChAcNLS for increasing intracellular accumulation. Transportation of (64)Cu when complexed to 7G3-ChAcNLS also resulted in increased nuclear and intracellular radioactivity accumulation. Thus, ChAcNLS is a novel mAb functionalizing technology that demonstrates its ability to increase AC intracellular accumulation in target cells through escaping endosome entrapment coupled to nuclear trafficking.
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Affiliation(s)
- Simon Beaudoin
- Departément de médecine nucléaire et radiobiologie, ‡Plateforme de synthèse de peptides et de sondes d'imageries, Faculté de médecine et sciences de la santé, and §Centre d'imagerie moléculaire de Sherbrooke (CIMS), Université de Sherbrooke , 3001 12e Avenue Nord, Sherbrooke, Québec J1H5N4, Canada
| | - Andreanne Rondeau
- Departément de médecine nucléaire et radiobiologie, ‡Plateforme de synthèse de peptides et de sondes d'imageries, Faculté de médecine et sciences de la santé, and §Centre d'imagerie moléculaire de Sherbrooke (CIMS), Université de Sherbrooke , 3001 12e Avenue Nord, Sherbrooke, Québec J1H5N4, Canada
| | - Olivier Martel
- Departément de médecine nucléaire et radiobiologie, ‡Plateforme de synthèse de peptides et de sondes d'imageries, Faculté de médecine et sciences de la santé, and §Centre d'imagerie moléculaire de Sherbrooke (CIMS), Université de Sherbrooke , 3001 12e Avenue Nord, Sherbrooke, Québec J1H5N4, Canada
| | - Marc-Andre Bonin
- Departément de médecine nucléaire et radiobiologie, ‡Plateforme de synthèse de peptides et de sondes d'imageries, Faculté de médecine et sciences de la santé, and §Centre d'imagerie moléculaire de Sherbrooke (CIMS), Université de Sherbrooke , 3001 12e Avenue Nord, Sherbrooke, Québec J1H5N4, Canada
| | - Johan E van Lier
- Departément de médecine nucléaire et radiobiologie, ‡Plateforme de synthèse de peptides et de sondes d'imageries, Faculté de médecine et sciences de la santé, and §Centre d'imagerie moléculaire de Sherbrooke (CIMS), Université de Sherbrooke , 3001 12e Avenue Nord, Sherbrooke, Québec J1H5N4, Canada
| | - Jeffrey V Leyton
- Departément de médecine nucléaire et radiobiologie, ‡Plateforme de synthèse de peptides et de sondes d'imageries, Faculté de médecine et sciences de la santé, and §Centre d'imagerie moléculaire de Sherbrooke (CIMS), Université de Sherbrooke , 3001 12e Avenue Nord, Sherbrooke, Québec J1H5N4, Canada
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10
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Auger electron-emitting 111 In-DTPA-NLS-CSL360 radioimmunoconjugates are cytotoxic to human acute myeloid leukemia (AML) cells displaying the CD123 + /CD131 − phenotype of leukemia stem cells. Appl Radiat Isot 2016; 110:1-7. [DOI: 10.1016/j.apradiso.2015.12.043] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 11/18/2015] [Accepted: 12/14/2015] [Indexed: 11/19/2022]
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11
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Leyton JV, Gao C, Williams B, Keating A, Minden M, Reilly RM. A radiolabeled antibody targeting CD123(+) leukemia stem cells - initial radioimmunotherapy studies in NOD/SCID mice engrafted with primary human AML. Leuk Res Rep 2015; 4:55-9. [PMID: 26500848 PMCID: PMC4588397 DOI: 10.1016/j.lrr.2015.07.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 07/17/2015] [Accepted: 07/25/2015] [Indexed: 11/03/2022] Open
Abstract
Radioimmunotherapy (RIT) with anti-CD123 monoclonal antibody CSL360 modified with nuclear translocation sequence (NLS) peptides and labeled with the Auger electron-emitter, (111)In ((111)In-NLS-CSL360) was studied in the prevalent NOD/SCID mouse AML engraftment assay. Significant decreases in CD123(+) leukemic cells and impairment of leukemic stem cell self-renewal were achieved with high doses of RIT. However, NOD/SCID mice were very radiosensitive to these doses. At low non-toxic treatment doses, (111)In-NLS-CSL360 demonstrated a trend towards improved survival associated with decreased spleen/body weight ratio, an indicator of leukemia burden, and almost complete eradication of leukemia from the bone marrow in some mice.
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Affiliation(s)
- Jeffrey V Leyton
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada
| | - Catherine Gao
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada
| | - Brent Williams
- Institute of Medical Science, University of Toronto, Toronto, ON, Canada ; Division of Hematology-Oncology, The Hospital for Sick Children, Toronto, ON, Canada ; Cell Therapy Program, The Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Armand Keating
- Cell Therapy Program, The Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada ; Department of Hematology-Oncology, The Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Mark Minden
- Department of Hematology-Oncology, The Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada ; Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada
| | - Raymond M Reilly
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, ON, Canada ; Toronto General Research Institute, University Health Network, Toronto, ON, Canada ; Joint Department of Medical Imaging, University Health Network, Toronto, ON, Canada
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