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Tornes AJK, Stenberg VY, Larsen RH, Bruland ØS, Revheim ME, Juzeniene A. Targeted alpha therapy with the 224Ra/ 212Pb-TCMC-TP-3 dual alpha solution in a multicellular tumor spheroid model of osteosarcoma. Front Med (Lausanne) 2022; 9:1058863. [PMID: 36507500 PMCID: PMC9727293 DOI: 10.3389/fmed.2022.1058863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 11/04/2022] [Indexed: 11/24/2022] Open
Abstract
Osteosarcoma patients with overt metastases at primary diagnosis have a 5-year survival rate of less than 20%. TP-3 is a murine IgG2b monoclonal antibody with high affinity for an epitope residing on the p80 osteosarcoma cell surface membrane antigen. The tumor-associated antigen p80 is overexpressed in osteosarcomas, and has very low normal tissue expression. We propose a novel dual alpha targeting solution containing two radionuclides from the same decay chain, including the bone-seeking 224Ra, and cancer cell-surface seeking 212Pb-TCMC-TP-3 for the treatment of osteoblastic bone cancers, circulating cancer cells and micrometastases. In this in vitro study, the cytotoxic effects of 212Pb-TCMC-TP-3 (single alpha solution) and 224Ra/212Pb-TCMC-TP-3 (dual alpha solution) were investigated in a multicellular spheroid model mimicking micrometastatic disease in osteosarcoma. OHS spheroids with diameters of 253 ± 98 μm treated with 4.5, 2.7, and 3.3 kBq/ml of 212Pb-TCMC-TP-3 for 1, 4, and 24 h, respectively, were disintegrated within 3 weeks. The 212Pb-TCMC-TP-3 induced a 7-fold delay in spheroid doubling time compared to a 28-times higher dose with the non-specific 212Pb-TCMC-rituximab. The 224Ra/212Pb-TCMC-TP-3 completely disintegrated spheroids with diameters of 218-476 μm within 3 and 2 weeks after 4 and 24 h incubation with 5 kBq/ml, respectively. Treatment with 1 kBq/ml of 224Ra/212Pb-TCMC-TP-3 for 24 h caused an 11.4-fold reduction in spheroid viability compared with unconjugated 224Ra/212Pb. The single and dual alpha solutions with TP-3 showed cytotoxicity in spheroids of clinically relevant size, which warrant further testing of the dual alpha solution using in vivo osteosarcoma models.
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Affiliation(s)
- Anna Julie Kjøl Tornes
- Department of Radiation Biology, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway,ArtBio AS, Oslo, Norway,Institute of Clinical Medicine, University of Oslo, Oslo, Norway,*Correspondence: Anna Julie Kjøl Tornes,
| | - Vilde Yuli Stenberg
- Department of Radiation Biology, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway,ArtBio AS, Oslo, Norway,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | | | - Øyvind Sverre Bruland
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway,Department of Oncology, Oslo University Hospital, Oslo, Norway
| | - Mona-Elisabeth Revheim
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway,Division of Radiology and Nuclear Medicine, Oslo University Hospital, Oslo, Norway
| | - Asta Juzeniene
- Department of Radiation Biology, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway,Department of Physics, University of Oslo, Oslo, Norway
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Antibody Conjugates for Sarcoma Therapy: How Far along Are We? Biomedicines 2021; 9:biomedicines9080978. [PMID: 34440182 PMCID: PMC8392509 DOI: 10.3390/biomedicines9080978] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 07/27/2021] [Accepted: 08/04/2021] [Indexed: 01/12/2023] Open
Abstract
Sarcomas are one of the most difficult type of cancer to manage and treat because of their extremely heterogeneous molecular and morphological features. Despite the progress made over the years in the establishment of standard protocols for high and low grading/staging sarcoma patients, mostly with chemotherapy and/or radiotherapy, 50% of treated patients experience relapse episodes. Because of this, in the last 20 years, new therapeutic approaches for sarcoma treatment have been evaluated in preclinical and clinical studies. Among them, antibody-based therapies have been the most studied. Immunoconjugates consist of a carrier portion, frequently represented by an antibody, linked to a toxic moiety, i.e., a drug, toxin, or radionuclide. While the efficacy of immunoconjugates is well demonstrated in the therapy of hematological tumors and more recently also of epithelial ones, their potential as therapeutic agents against sarcomas is still not completely explored. In this paper, we summarize the results obtained with immunoconjugates targeting sarcoma surface antigens, considering both preclinical and clinical studies. To date, the encouraging results obtained in preclinical studies allowed nine immunoconjugates to enter clinical trials, demonstrating the validity of immunotherapy as a promising pharmacological tool also for sarcoma therapy.
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Mercatelli D, Bortolotti M, Bazzocchi A, Bolognesi A, Polito L. Immunoconjugates for Osteosarcoma Therapy: Preclinical Experiences and Future Perspectives. Biomedicines 2018; 6:E19. [PMID: 29439419 PMCID: PMC5874676 DOI: 10.3390/biomedicines6010019] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 01/30/2018] [Accepted: 02/04/2018] [Indexed: 01/08/2023] Open
Abstract
Osteosarcoma (OS) is an aggressive osteoid-producing tumor of mesenchymal origin, which represents the most common primary bone malignancy. It is characterized by a complex and frequently uncertain etiology. The current standard care for high-grade OS treatment is neoadjuvant chemotherapy, followed by surgery and post-operative chemotherapy. In order to ameliorate survival rates of patients, new therapeutic approaches have been evaluated, mainly immunotherapy with antibody-drug conjugates or immunoconjugates. These molecules consist of a carrier (frequently an antibody) joined by a linker to a toxic moiety (drug, radionuclide, or toxin). Although several clinical trials with immunoconjugates have been conducted, mainly in hematological tumors, their potential as therapeutic agents is relatively under-explored in many types of cancer. In this review, we report the immunoconjugates directed against OS surface antigens, considering the in vitro and in vivo studies. To date, several attempts have been made in preclinical settings, reporting encouraging results and demonstrating the validity of the idea. The clinical experience with glembatumumab vedotin may provide new insights into the real efficacy of antibody-drug conjugates for OS therapy, possibly giving more information about patient selection. Moreover, new opportunities could arise from the ongoing clinical trials in OS patients with unconjugated antibodies that could represent future candidates as carrier moieties of immunoconjugates.
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Affiliation(s)
- Daniele Mercatelli
- Department of Experimental, Diagnostic and Specialty Medicine-DIMES, Alma Mater Studiorum, University of Bologna, Via San Giacomo 14, 40126 Bologna, Italy.
- Department of Diagnostic and Interventional Radiology, The "Rizzoli" Orthopaedic Institute, Via G. C. Pupilli 1, 40136 Bologna, Italy.
| | - Massimo Bortolotti
- Department of Experimental, Diagnostic and Specialty Medicine-DIMES, Alma Mater Studiorum, University of Bologna, Via San Giacomo 14, 40126 Bologna, Italy.
| | - Alberto Bazzocchi
- Department of Diagnostic and Interventional Radiology, The "Rizzoli" Orthopaedic Institute, Via G. C. Pupilli 1, 40136 Bologna, Italy.
| | - Andrea Bolognesi
- Department of Experimental, Diagnostic and Specialty Medicine-DIMES, Alma Mater Studiorum, University of Bologna, Via San Giacomo 14, 40126 Bologna, Italy.
| | - Letizia Polito
- Department of Experimental, Diagnostic and Specialty Medicine-DIMES, Alma Mater Studiorum, University of Bologna, Via San Giacomo 14, 40126 Bologna, Italy.
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Zahaf NI, Schmidt G. Bacterial Toxins for Cancer Therapy. Toxins (Basel) 2017; 9:toxins9080236. [PMID: 28788054 PMCID: PMC5577570 DOI: 10.3390/toxins9080236] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 07/21/2017] [Accepted: 07/26/2017] [Indexed: 12/18/2022] Open
Abstract
Several pathogenic bacteria secrete toxins to inhibit the immune system of the infected organism. Frequently, they catalyze a covalent modification of specific proteins. Thereby, they block production and/or secretion of antibodies or cytokines. Moreover, they disable migration of macrophages and disturb the barrier function of epithelia. In most cases, these toxins are extremely effective enzymes with high specificity towards their cellular substrates, which are often central signaling molecules. Moreover, they encompass the capacity to enter mammalian cells and to modify their substrates in the cytosol. A few molecules, at least of some toxins, are sufficient to change the cellular morphology and function of a cell or even kill a cell. Since many of those toxins are well studied concerning molecular mechanisms, cellular receptors, uptake routes, and structures, they are now widely used to analyze or to influence specific signaling pathways of mammalian cells. Here, we review the development of immunotoxins and targeted toxins for the treatment of a disease that is still hard to treat: cancer.
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Affiliation(s)
- Nour-Imene Zahaf
- Institute for Experimental and Clinical Pharmacology and Toxicology, Faculty of Medicine, Albert-Ludwigs-University, Albert-Str. 25, 79104 Freiburg, Germany.
| | - Gudula Schmidt
- Institute for Experimental and Clinical Pharmacology and Toxicology, Faculty of Medicine, Albert-Ludwigs-University, Albert-Str. 25, 79104 Freiburg, Germany.
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Weldon JE, Pastan I. A guide to taming a toxin--recombinant immunotoxins constructed from Pseudomonas exotoxin A for the treatment of cancer. FEBS J 2011; 278:4683-700. [PMID: 21585657 PMCID: PMC3179548 DOI: 10.1111/j.1742-4658.2011.08182.x] [Citation(s) in RCA: 181] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Pseudomonas exotoxin A (PE) is a highly toxic protein secreted by the opportunistic pathogen Pseudomonas aeruginosa. The modular structure and corresponding mechanism of action of PE make it amenable to extensive modifications that can redirect its potent cytotoxicity from disease to a therapeutic function. In combination with a variety of artificial targeting elements, such as receptor ligands and antibody fragments, PE becomes a selective agent for the elimination of specific cell populations. This review summarizes our current understanding of PE, its intoxication pathway, and the ongoing efforts to convert this toxin into a treatment for cancer.
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Affiliation(s)
- John E Weldon
- Laboratory of Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892-4264, USA
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Alvegård T, Hall KS, Bauer H, Rydholm A. The Scandinavian Sarcoma Group: 30 years' experience. ACTA ORTHOPAEDICA. SUPPLEMENTUM 2009; 80:1-104. [PMID: 19919379 DOI: 10.1080/17453690610046602] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Ochiai H, Archer GE, Herndon JE, Kuan CT, Mitchell DA, Bigner DD, Pastan IH, Sampson JH. EGFRvIII-targeted immunotoxin induces antitumor immunity that is inhibited in the absence of CD4+ and CD8+ T cells. Cancer Immunol Immunother 2007; 57:115-21. [PMID: 17634939 PMCID: PMC2846815 DOI: 10.1007/s00262-007-0363-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2007] [Accepted: 06/20/2007] [Indexed: 11/29/2022]
Abstract
PURPOSE Immunotoxins as anti-cancer therapeutics have several potential advantages over conventional agents including a high specificity, extraordinary potency, and a lack of an identified mechanism for resistance. It has been clearly demonstrated that Pseudomonas-based immunotoxins have a direct cytotoxic effect. However, delayed and often dramatic antitumor responses seen in human studies with targeted toxins led us to hypothesize that immunologic responses may be a secondary mechanism that enhances the therapeutic efficacy of these novel drugs. EXPERIMENTAL DESIGN This hypothesis was tested in a murine system using an immunotoxin, MR1-1 [MR1-1(dsFv)-PE38KDEL], that targets a syngeneic murine homologue of the tumor-specific human epidermal growth factor mutation, EGFRvIII, expressed on a murine cell line. RESULTS Intratumoral treatment with MR1-1 eliminated EGFRvIII-expressing tumors (P < 0.0001). The antitumor activity of MR1-1 was dependent on the expression of EGFRvIII on some, but not all tumors cells, and was significantly inhibited in the absence of CD4+ (P = 0.0193) and CD8+ (P = 0.0193) T cells. MR1-1 induced EGFRvIII-specific immunity (P < 0.0005) and produced long lasting immunity against tumors expressing EGFRvIII as well as EGFRvIII-negative tumors. CONCLUSIONS These data suggest that immunotoxins may not be strictly dependent on direct cytotoxicity for their efficacy, but may also be potent inducers of antitumor immunity active even against cells that do not express the targeted antigen.
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Affiliation(s)
- Hidenobu Ochiai
- Department of Surgery (Neurosurgery), Duke University Medical Center, Box 3050, Durham, NC 27710, USA
| | - Gary E. Archer
- Department of Surgery (Neurosurgery), Duke University Medical Center, Box 3050, Durham, NC 27710, USA
| | - James E. Herndon
- Department of Biostatistics and Bioinformatics, Duke University Medical Center, Durham, NC 27710, USA
| | - Chien-Tsun Kuan
- Department of Pathology, Duke University Medical Center, Durham, NC 27710, USA
| | - Duane A. Mitchell
- Department of Surgery (Neurosurgery), Duke University Medical Center, Box 3050, Durham, NC 27710, USA
| | - Darell D. Bigner
- Department of Surgery (Neurosurgery), Duke University Medical Center, Box 3050, Durham, NC 27710, USA
- Department of Pathology, Duke University Medical Center, Durham, NC 27710, USA
| | - Ira H. Pastan
- Laboratory of Molecular Biology, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - John H. Sampson
- Department of Surgery (Neurosurgery), Duke University Medical Center, Box 3050, Durham, NC 27710, USA
- Department of Pathology, Duke University Medical Center, Durham, NC 27710, USA
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Fuchs H, Bachran C, Li T, Heisler I, Dürkop H, Sutherland M. A cleavable molecular adapter reduces side effects and concomitantly enhances efficacy in tumor treatment by targeted toxins in mice. J Control Release 2007; 117:342-50. [PMID: 17207883 DOI: 10.1016/j.jconrel.2006.11.019] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2006] [Revised: 11/07/2006] [Accepted: 11/20/2006] [Indexed: 11/19/2022]
Abstract
Two of the main problems associated with administration of receptor-targeted toxins in tumor therapy are severe systemic side effects and low transfer of the toxins into the cytosol after binding to the tumor cell surface. To improve chimeric toxins in this respect we have developed a molecular adapter that links the toxic moiety and ligand. The adapter is designed to improve cytosolic uptake, retain the toxin inside the cytosol and detoxify the drug after cell death. The plant toxin saporin linked either directly or via the adapter to epidermal growth factor (EGF) served to evaluate efficacy to inhibit tumor growth and reduce side effects in vivo. The lethal dose for BALB/c mice was three times less for the adapter-containing toxin (SA2E) than for the adapter-free construct (SE). Furthermore, SE only reduced the average weight of induced tumors by 33% whereas SA2E-treated mice exhibited 71% reduction with an almost complete suppression in 60% of the cases. Additionally, severe side effects like hyperalgesia, alopecia and death were drastically reduced in SA2E-treated animals. Tumors without target receptor were only slightly affected by SA2E and the reduction in side effects less pronounced indicating specific depletion from the blood by target receptor expressing cells.
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Affiliation(s)
- Hendrik Fuchs
- Zentralinstitut für Laboratoriumsmedizin und Pathobiochemie, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, D-12200 Berlin, Germany.
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Onda M, Nagata S, Ho M, Bera TK, Hassan R, Alexander RH, Pastan I. Megakaryocyte potentiation factor cleaved from mesothelin precursor is a useful tumor marker in the serum of patients with mesothelioma. Clin Cancer Res 2007; 12:4225-31. [PMID: 16857795 DOI: 10.1158/1078-0432.ccr-06-0472] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE To establish monoclonal antibodies (mAb) against megakaryocyte potentiation factor (MPF) and detect MPF in the blood of patients with mesothelioma. EXPERIMENTAL DESIGN Mice were immunized with a purified recombinant human MPF-rabbit-Fc fusion protein and with MPF. Several hybridomas producing mAbs to MPF were established. A double-determinant (sandwich) ELISA was constructed using mAbs to two different epitopes and used to determine if MPF is present in the serum of patients with mesothelioma. RESULTS We established seven anti-MPF mAbs whose topographical epitopes were classified into three nonoverlapping groups. All the mAbs reacted with recombinant MPF protein by ELISA. One of the mAbs detected MPF and the mesothelin precursor protein containing MPF in cell lysates on Western blotting. A sandwich ELISA using mAbs to two different epitopes was constructed and used to measure the presence of MPF in the media of various mesothelin-expressing cancer cell lines and in human serum. The ELISA showed that MPF levels were elevated in 91% (51 of 56) of patients with mesothelioma compared with healthy controls. Furthermore, serum MPF fell to normal levels in two patients after surgery for their peritoneal mesothelioma. CONCLUSIONS Using new mAbs to MPF, we showed that MPF is secreted by several mesothelioma cell lines and is frequently elevated in the blood of patients with mesothelioma. Measurement of MPF may be useful in following the response of mesothelioma to treatment.
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Affiliation(s)
- Masanori Onda
- Laboratory of Molecular Biology, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, Maryland 20892-4264, USA
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Nagai T, Tanaka M, Tsuneyoshi Y, Matsushita K, Sunahara N, Matsuda T, Yoshida H, Komiya S, Onda M, Matsuyama T. In vitro and in vivo efficacy of a recombinant immunotoxin against folate receptor beta on the activation and proliferation of rheumatoid arthritis synovial cells. ARTHRITIS AND RHEUMATISM 2006; 54:3126-34. [PMID: 17009233 DOI: 10.1002/art.22082] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To investigate the effects of the recombinant immunotoxin dsFv anti-FRbeta-PE38, which consists of the disulfide-stabilized Fv fragment (dsFv) of the anti-folate receptor beta (anti-FRbeta) antibody and the 38-kd portion of Pseudomonas exotoxin A (PE38), on the activation and proliferation of cells that function in inflammatory and degradative processes in rheumatoid arthritis (RA) synovial tissue. METHODS The Ig VH-PE38 fusion protein and the Ig VL protein were produced in Escherichia coli, and then joined with a disulfide bond by engineering cysteine residues in the framework regions of these proteins. The effects of dsFv anti-FRbeta-PE38 on the activation and proliferation of cells in RA synovial tissue were investigated by immunohistochemistry; the numbers of cells expressing CD68, vascular cell adhesion molecule 1, angiopoietin 1, CD34, proliferating cell nuclear antigen, and interleukin-6 and the numbers of apoptotic cells were counted in RA synovial tissue engrafted into SCID mice treated or not treated with dsFv anti-FRbeta-PE38. The effects of dsFv anti-FRbeta-PE38 on the generation of osteoclasts from RA adherent synovial mononuclear cells in vitro was investigated by counting the number of resorption pits on dentin slices treated or not treated with dsFv anti-FRbeta-PE38. RESULTS Administration of dsFv anti-FRbeta-PE38 reduced the numbers of macrophages, activated fibroblast-like cells, endothelial cells, and proliferating cells and increased the numbers of apoptotic cells in RA synovial tissue engrafted into SCID mice. In vitro, the generation of osteoclasts from RA adherent synovial mononuclear cells was largely suppressed by treatment with dsFv anti-FRbeta-PE38. CONCLUSION Our findings show that dsFv anti-FRbeta-PE38 immunotoxin would be a promising tool for the treatment of RA synovitis, especially when administered intraarticularly.
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Affiliation(s)
- Taku Nagai
- Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
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