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Yang Y, Sanders AJ, Dou QP, Jiang DG, Li AX, Jiang WG. The Clinical and Theranostic Values of Activated Leukocyte Cell Adhesion Molecule (ALCAM)/CD166 in Human Solid Cancers. Cancers (Basel) 2021; 13:cancers13205187. [PMID: 34680335 PMCID: PMC8533996 DOI: 10.3390/cancers13205187] [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: 09/17/2021] [Revised: 10/13/2021] [Accepted: 10/14/2021] [Indexed: 02/08/2023] Open
Abstract
Simple Summary ALCAM (activated leukocyte cell adhesion molecule) is an important regulator in human cancers, particularly solid tumours. Its expression in cancer tissues has prognostic values depending on cancer types and is also linked to distant metastases. A truncated form, soluble form of ALCAM (sALCAM) in circulation has been suggested to be a prognostic indicator and a potential therapeutic tool. This article summarises recent findings and progress in ALCAM and its involvement in cancer, with a primary focus on its clinical connections and therapeutic values. Abstract Activated leukocyte cell adhesion molecule (ALCAM), also known as CD166, is a cell adhesion protein that is found in multiple cell types. ALCAM has multiple and diverse roles in various physiological and pathological conditions, including inflammation and cancer. There has been compelling evidence of ALCAM’s prognostic value in solid cancers, indicating that it is a potential therapeutic target. The present article overviews the recent findings and progress in ALCAM and its involvement in cancer, with a primary focus on its clinical connections in cancer and therapeutic values.
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Affiliation(s)
- Yiming Yang
- School of Medicine, Cardiff University, Henry Wellcome Building, Cardiff CF14 4XN, UK; (Y.Y.); (Q.P.D.); (D.G.J.); (A.X.L.)
| | - Andrew J. Sanders
- School of Medicine, Cardiff University, Henry Wellcome Building, Cardiff CF14 4XN, UK; (Y.Y.); (Q.P.D.); (D.G.J.); (A.X.L.)
- Correspondence: (A.J.S.); (W.G.J.)
| | - Q. Ping Dou
- School of Medicine, Cardiff University, Henry Wellcome Building, Cardiff CF14 4XN, UK; (Y.Y.); (Q.P.D.); (D.G.J.); (A.X.L.)
- Departments of Oncology, Pharmacology and Pathology School of Medicine, Barbara Ann Karmanos Cancer Institute, Wayne State University, Detroit, MI 48201-2013, USA
| | - David G. Jiang
- School of Medicine, Cardiff University, Henry Wellcome Building, Cardiff CF14 4XN, UK; (Y.Y.); (Q.P.D.); (D.G.J.); (A.X.L.)
- Stoke Mandeville Hospital, Buckinghamshire Healthcare NHS Trust, Aylesbury HP21 8AL, UK
| | - Amber Xinyu Li
- School of Medicine, Cardiff University, Henry Wellcome Building, Cardiff CF14 4XN, UK; (Y.Y.); (Q.P.D.); (D.G.J.); (A.X.L.)
| | - Wen G. Jiang
- School of Medicine, Cardiff University, Henry Wellcome Building, Cardiff CF14 4XN, UK; (Y.Y.); (Q.P.D.); (D.G.J.); (A.X.L.)
- Correspondence: (A.J.S.); (W.G.J.)
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Zarghami N, Soto MS, Perez-Balderas F, Khrapitchev AA, Karali CS, Johanssen VA, Ansorge O, Larkin JR, Sibson NR. A novel molecular magnetic resonance imaging agent targeting activated leukocyte cell adhesion molecule as demonstrated in mouse brain metastasis models. J Cereb Blood Flow Metab 2021; 41:1592-1607. [PMID: 33153376 PMCID: PMC8217895 DOI: 10.1177/0271678x20968943] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 09/07/2020] [Accepted: 09/18/2020] [Indexed: 01/26/2023]
Abstract
Molecular magnetic resonance imaging (MRI) allows visualization of biological processes at the molecular level. Upregulation of endothelial ALCAM (activated leukocyte cell adhesion molecule) is a key element for leukocyte recruitment in neurological disease. The aim of this study, therefore, was to develop a novel molecular MRI contrast agent, by conjugating anti-ALCAM antibodies to microparticles of iron oxide (MPIO), for detection of endothelial ALCAM expression in vivo. Binding specificity of ALCAM-MPIO was demonstrated in vitro under static and flow conditions. Subsequently, in a proof-of-concept study, mouse models of brain metastasis were induced by intracardial injection of brain-tropic human breast carcinoma, lung adenocarcinoma or melanoma cells to upregulate endothelial ALCAM. At selected time-points, mice were injected intravenously with ALCAM-MPIO, and ALCAM-MPIO induced hypointensities were observed on T2*-weighted images in all three models. Post-gadolinium MRI confirmed an intact blood-brain barrier, indicating endoluminal binding. Correlation between endothelial ALCAM expression and ALCAM-MPIO binding was confirmed histologically. Statistical analysis indicated high sensitivity (80-90%) and specificity (79-83%) for detection of endothelial ALCAM in vivo with ALCAM-MPIO. Given reports of endothelial ALCAM upregulation in numerous neurological diseases, this advance in our ability to image ALCAM in vivo may yield substantial improvements for both diagnosis and targeted therapy.
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Affiliation(s)
- Niloufar Zarghami
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
| | - Manuel Sarmiento Soto
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
| | - Francisco Perez-Balderas
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
| | - Alexandre A Khrapitchev
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
| | - Christina Simoglou Karali
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
| | - Vanessa A Johanssen
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
| | - Olaf Ansorge
- Department of Clinical Neuropathology, John Radcliffe Hospital, Oxford, UK
| | - James R Larkin
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
| | - Nicola R Sibson
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
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Natarajan A. Copper-64-immunoPET imaging: bench to bedside. THE QUARTERLY JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING : OFFICIAL PUBLICATION OF THE ITALIAN ASSOCIATION OF NUCLEAR MEDICINE (AIMN) [AND] THE INTERNATIONAL ASSOCIATION OF RADIOPHARMACOLOGY (IAR), [AND] SECTION OF THE SOCIETY OF RADIOPHARMACEUTICAL CHEMISTRY AND BIOLOGY 2020; 64:356-363. [PMID: 33045821 DOI: 10.23736/s1824-4785.20.03310-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Positron emission tomography (PET) is a growing non-invasive diagnostic and molecular imaging tool in nuclear medicine, that is used to identify several diseases including cancer. The immunoPET probe is made up of monoclonal antibodies (mAbs) or its fragments or similar molecules that tagged with positron radioisotopes (68Ga, 64Cu, 89Zr) bound together by a bifunctional chelator (BFC). This probe is designed to identify a specific disease. Currently, several immunoPET probes are being developed for preclinical as well as for clinical applications. These studies are showing promising results, both in preclinical and patients, using mostly 64Cu, 89Zr isotopes. This review elucidates the 64Cu based immunoPET applications, their pipelines and the emerging scope of this technique within the nuclear medicine and molecular imaging clinics from bench to bedside. Recently, immunoPET research have sharply increased especially after a big surge in approval of oncology antibodies by the FDA for immune checkpoint-blockade cancer immunotherapies. Currently, preclinical to clinical translations of immunoPET has several challenges, including designing probes, choice of radioisotopes, selection of stable BFC, and size of antibody and its tracer kinetics. All these obstacles will be addressed eventually by improving PET scanner sensitivity, designing appropriate size of imaging probe, and combining immunoPET with specific targeting antibodies. These improvements should contribute to the immunoPET becoming more applicable in clinics, which, in turn, will provide critical information for correct patient selection, for right dosing, and for the right time/staging of treatment.
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Guan SS, Wu CT, Liao TZ, Luo TY, Lin KL, Liu SH. Indium-111-labeled CD166-targeted peptide as a potential nuclear imaging agent for detecting colorectal cancer stem-like cells in a xenograft mouse model. EJNMMI Res 2020; 10:13. [PMID: 32096011 PMCID: PMC7040160 DOI: 10.1186/s13550-020-0597-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 01/17/2020] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Cancer stem cells (CSCs) are involved in drug resistance, metastasis, and relapse of cancers, which can significantly affect tumor therapy. Hence, to develop specifically therapeutic target probe at CSCs for improvement of survival and quality of life of cancer patients is urgently needed. The CD166 protein has been suggested to be involved in colorectal cancer (CRC) tumorigenesis and to be considered a marker for colorectal CSCs (CRCSCs) detection. In this study, therefore, we attend to apply a nuclear imaging agent probe, Glycine18-Cystine-linked CD166-targeted peptides (CD166tp-G18C), to detect the changes of CD166 level in a CRC xenograft mouse model. RESULTS We isolated the CD166-positive cells from the HCT15 CRC cell line (CD166+HCT15) and evaluated their morphology and ability of clone formation, migration, protein expression, and drug resistance. The CD166-positive HCT15 cells display the CSCs characteristics. We discovered and designed a CD166-targeted peptide (CD166tp-G18C) as a targeted probe of CRC stem-like cell for cell binding assay. The CD166tp-G18C confirmed the CD166 protein targeting ability in CD166+HCT15 cells. The diethylenetriaminopentaacetic acid (DTPA)-conjugated CD166tp-G18C further was labeled with indium-111 (111In-DTPA-CD166tp-G18C) as nuclear imaging agent for imaging and bio-distribution analysis in vivo. Finally, we observed that the 111In-DTPA-CD166tp-G18C was significantly enhanced in tumor tissues of CD166+HCT15 xenograft mice as compared to the non-CD166tp-G18C control. CONCLUSIONS Our results indicated that the indium-111-labeled CD166tp-G18C may be served as a powerful tool for colorectal CSCs nuclear imaging in the CRC patients.
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Affiliation(s)
- Siao-Syun Guan
- Institute of Nuclear Energy Research, Atomic Energy Council, Taoyuan, Taiwan
| | - Cheng-Tien Wu
- Department of Nutrition, China Medical University, Taichung, 40402, Taiwan.,Master Program of Food and Drug Safety, China Medical University, Taichung, 40402, Taiwan
| | - Tse-Zung Liao
- Institute of Nuclear Energy Research, Atomic Energy Council, Taoyuan, Taiwan
| | - Tsai-Yueh Luo
- Institute of Nuclear Energy Research, Atomic Energy Council, Taoyuan, Taiwan
| | - Kun-Liang Lin
- Institute of Nuclear Energy Research, Atomic Energy Council, Taoyuan, Taiwan
| | - Shing-Hwa Liu
- Institute of Toxicology, College of Medicine, National Taiwan University, No. 1, Jen-Ai Road, Section 1, Taipei, 10051, Taiwan. .,Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan. .,Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan.
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Gamache RF, Zettlitz KA, Tsai WTK, Collins J, Wu AM, Murphy JM. Tri-functional platform for construction of modular antibody fragments for in vivo 18F-PET or NIRF molecular imaging. Chem Sci 2020; 11:1832-1838. [PMID: 34123276 PMCID: PMC8148382 DOI: 10.1039/c9sc05007h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Positron emission tomography (PET) molecular imaging is a powerful tool for interrogating physiological and biochemical processes to understand the biology of disease and advance therapeutic developments. Near-infrared fluorescence (NIRF) optical imaging has become increasingly popular for intraoperative staging to enable cellular resolution imaging of tumor margins during surgical resection. In addition, engineered antibody fragments have emerged as promising molecular imaging agents given their exquisite target selectivity, rapid systemic clearance and site-selective chemical modification. We report a tri-functional platform for construction of a modular antibody fragment that can rapidly be labeled with radionuclides or fluorophores for PET or NIRF molecular imaging of prostate stem cell antigen (PSCA). To provide a universal approach towards the targeted delivery of PET and optical imaging agents, we have developed a tri-functional platform (TFP) for the facile construction of modular, target-specific tracers.![]()
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Affiliation(s)
- Raymond F Gamache
- Department of Chemistry and Biochemistry, University of California Los Angeles CA 90095 USA
| | - Kirstin A Zettlitz
- Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles CA 90095 USA
| | - Wen-Ting K Tsai
- Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles CA 90095 USA
| | - Jeffrey Collins
- Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles CA 90095 USA
| | - Anna M Wu
- Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles CA 90095 USA
| | - Jennifer M Murphy
- Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging, David Geffen School of Medicine, University of California Los Angeles CA 90095 USA
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Fu R, Carroll L, Yahioglu G, Aboagye EO, Miller PW. Antibody Fragment and Affibody ImmunoPET Imaging Agents: Radiolabelling Strategies and Applications. ChemMedChem 2018; 13:2466-2478. [PMID: 30246488 PMCID: PMC6587488 DOI: 10.1002/cmdc.201800624] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Indexed: 12/12/2022]
Abstract
Antibodies have long been recognised as potent vectors for carrying diagnostic medical radionuclides, contrast agents and optical probes to diseased tissue for imaging. The area of ImmunoPET combines the use of positron emission tomography (PET) imaging with antibodies to improve the diagnosis, staging and monitoring of diseases. Recent developments in antibody engineering and PET radiochemistry have led to a new wave of experimental ImmunoPET imaging agents that are based on a range of antibody fragments and affibodies. In contrast to full antibodies, engineered affibody proteins and antibody fragments such as minibodies, diabodies, single-chain variable region fragments (scFvs), and nanobodies are much smaller but retain the essential specificities and affinities of full antibodies in addition to more desirable pharmacokinetics for imaging. Herein, recent key developments in the PET radiolabelling strategies of antibody fragments and related affibody molecules are highlighted, along with the main PET imaging applications of overexpressed antigen-associated tumours and immune cells.
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Affiliation(s)
- Ruisi Fu
- Department of ChemistryImperial College LondonExhibition RoadSouth Kensington, LondonSW7 2AZUK
- Comprehensive Cancer Imaging Centre, Department of Surgery and CancerImperial College London, Hammersmith CampusDu Cane RoadLondonW12 0NNUK
| | - Laurence Carroll
- Comprehensive Cancer Imaging Centre, Department of Surgery and CancerImperial College London, Hammersmith CampusDu Cane RoadLondonW12 0NNUK
| | - Gokhan Yahioglu
- Department of ChemistryImperial College LondonExhibition RoadSouth Kensington, LondonSW7 2AZUK
- Antikor Biopharma Ltd.StevenageSG1 2FXUK
| | - Eric O. Aboagye
- Comprehensive Cancer Imaging Centre, Department of Surgery and CancerImperial College London, Hammersmith CampusDu Cane RoadLondonW12 0NNUK
| | - Philip W. Miller
- Department of ChemistryImperial College LondonExhibition RoadSouth Kensington, LondonSW7 2AZUK
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Tummers WS, Willmann JK, Bonsing BA, Vahrmeijer AL, Gambhir SS, Swijnenburg RJ. Advances in Diagnostic and Intraoperative Molecular Imaging of Pancreatic Cancer. Pancreas 2018; 47:675-689. [PMID: 29894417 PMCID: PMC6003672 DOI: 10.1097/mpa.0000000000001075] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Pancreatic ductal adenocarcinoma (PDAC) has a dismal prognosis. To improve outcomes, there is a critical need for improved tools for detection, accurate staging, and resectability assessment. This could improve patient stratification for the most optimal primary treatment modality. Molecular imaging, used in combination with tumor-specific imaging agents, can improve established imaging methods for PDAC. These novel, tumor-specific imaging agents developed to target specific biomarkers have the potential to specifically differentiate between malignant and benign diseases, such as pancreatitis. When these agents are coupled to various types of labels, this type of molecular imaging can provide integrated diagnostic, noninvasive imaging of PDAC as well as image-guided pancreatic surgery. This review provides a detailed overview of the current clinical imaging applications, upcoming molecular imaging strategies for PDAC, and potential targets for imaging, with an emphasis on intraoperative imaging applications.
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Affiliation(s)
- Willemieke S. Tummers
- Department of Radiology, Molecular Imaging Program at Stanford, Stanford University, Stanford, CA. Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands
| | - Juergen K. Willmann
- Department of Radiology, Molecular Imaging Program at Stanford, Stanford University, Stanford, CA. Juergen K. Willmann died January 8, 2018
| | - Bert A. Bonsing
- Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands
| | | | - Sanjiv S. Gambhir
- Address correspondence to: R.J. Swijnenburg, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands (). Tel: +31 71 526 4005, Fax: +31 71 526 6750
| | - Rutger-Jan Swijnenburg
- Department of Surgery, Leiden University Medical Center, Albinusdreef 2, 2300 RC, Leiden, The Netherlands
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ImmunoPET Imaging of αvβ6 Expression Using an Engineered Anti-αvβ6 Cys-diabody Site-Specifically Radiolabeled with Cu-64: Considerations for Optimal Imaging with Antibody Fragments. Mol Imaging Biol 2017; 20:103-113. [DOI: 10.1007/s11307-017-1097-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Ha KD, Bidlingmaier SM, Su Y, Lee NK, Liu B. Identification of Novel Macropinocytosing Human Antibodies by Phage Display and High-Content Analysis. Methods Enzymol 2017; 585:91-110. [PMID: 28109445 PMCID: PMC8671048 DOI: 10.1016/bs.mie.2016.10.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Internalizing antibodies have great potential for the development of targeted therapeutics. Antibodies that internalize via the macropinocytosis pathway are particularly promising since macropinocytosis is capable of mediating rapid, bulk uptake and is selectively upregulated in many cancers. We hereby describe a method for identifying antibodies that internalize via macropinocytosis by screening phage-displayed single-chain antibody selection outputs with an automated fluorescent microscopy-based high-content analysis platform. Furthermore, this method can be similarly applied to other endocytic pathways if other fluorescent, pathway-specific, soluble markers are available.
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Affiliation(s)
| | | | | | | | - Bin Liu
- Corresponding author Department of Anesthesia, University of California at San Francisco, 1001 Potrero Ave., Box 1305, San Francisco, CA 94110-1305,
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Weber T, Bötticher B, Arndt MA, Mier W, Sauter M, Exner E, Keller A, Krämer S, Leotta K, Wischnjow A, Grosse-Hovest L, Strumberg D, Jäger D, Gröne HJ, Haberkorn U, Brem G, Krauss J. Preclinical evaluation of a diabody-based 177Lu-radioimmunoconjugate for CD22-directed radioimmunotherapy in a non-Hodgkin lymphoma mouse model. Cancer Lett 2016; 381:296-304. [DOI: 10.1016/j.canlet.2016.08.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 07/15/2016] [Accepted: 08/09/2016] [Indexed: 10/21/2022]
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Bruce VJ, Ta AN, McNaughton BR. Minimalist Antibodies and Mimetics: An Update and Recent Applications. Chembiochem 2016; 17:1892-1899. [DOI: 10.1002/cbic.201600303] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Virginia J. Bruce
- Department of Chemistry; Colorado State University; Fort Collins CO 80523 USA
| | - Angeline N. Ta
- Department of Chemistry; Colorado State University; Fort Collins CO 80523 USA
| | - Brian R. McNaughton
- Department of Chemistry; Colorado State University; Fort Collins CO 80523 USA
- Department of Biochemistry and Molecular Biology; Colorado State University; Fort Collins CO 80523 USA
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White JB, Boucher DL, Zettlitz KA, Wu AM, Sutcliffe JL. Development and characterization of an αvβ6-specific diabody and a disulfide-stabilized αvβ6-specific cys-diabody. Nucl Med Biol 2015; 42:945-57. [PMID: 26341848 DOI: 10.1016/j.nucmedbio.2015.07.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 07/25/2015] [Accepted: 07/31/2015] [Indexed: 11/15/2022]
Abstract
INTRODUCTION This work describes the development and characterization of two antibody fragments that specifically target the α(v)β(6) integrin, a non-covalent diabody and a disulfide-stabilized cys-diabody. The diabodies were analyzed for their ability to bind both immobilized and cell surface-bound α(v)β(6). Radiolabeling was done using non-site-specific and site-specific conjugation approaches with N-succinimidyl 4-[(18)F]fluorobenzoate ([(18)F]-SFB) and the bifunctional chelator 1,4,7-triazacyclononane-triacetic acid maleimide (NOTA-maleimide) and copper-64 ([(64)Cu]), respectively. The affects of each radiolabeling method on RCY, RCP, and immunoreactivity were analyzed for the [(18)F]-FB-α(v)β(6) diabody, [(18)F]-FB-α(v)β(6) cys-diabody, and the [(64)Cu]-NOTA-α(v)β(6) cys-diabody. METHODS Diabodies were constructed from the variable domains of the humanized 6.3G9 anti-α(v)β(6) intact antibody. The anti-α(v(β(6) cys-diabody was engineered with C-terminal cysteines to enable covalent dimerization and site-specific modification. Biochemical characterization included SDS-PAGE, Western blot, and electrospray ionization to confirm MW, and flow cytometry and ELISA experiments were used to determine binding affinity and specificity to α(v)β(6). The diabodies were radiolabeled with [(18)F]-SFB and in addition, the anti-α(v)β(6) cys-diabody was also radiolabeled site-specifically using NOTA-maleimide and [(64)Cu]. Immunoreactivities were confirmed using in vitro cell binding to DX3Puroβ(6) (α(v)β(6)+) and DX3Puro (α(v)β(6)-)cell lines. RESULTS The diabodies were purified from cell culture supernatants with purities >98%. Subnanomolar binding affinity towards αvβ6 was confirmed by ELISA (diabody IC(50)=0.8 nM, cys-diabody IC(50)=0.6 nM) and flow cytometry revealed high specificity only to the DX3Puroβ(6) cell line for both diabodies. RCYs were 22.6%±3.6% for the [(18)F]-FB-α(v)β(6) diabody, 8.3%±1.7% for the [(18)F]-FB-α(v)β(6) cys-diabody and 43.5%±5.5% for the [(64)Cu]-NOTA-α(v)β(6) cys-diabody. In vitro cell binding assays revealed excellent specificity and retention of immunoreactivity ([(18)F]-FB-α(v)β(6) diabody=58.7%±6.7%, [(18)F]-FB-α(v)β(6) cys-diabody=80.4%±4.4%, [(64)Cu]-NOTA-α(v)β(6) cys-diabody=59.4%±0.6%) regardless of the radiolabeling method used. CONCLUSIONS Two novel diabodies with excellent binding affinity and specificity for the α(v)β(6) integrin in vitro were developed. Radiolabeling of the diabodies with fluorine-18 ([(18)F]) and [(64)Cu] revealed advantages and disadvantages with regards to methodologies and RCYs, however immunoreactivities were well preserved regardless of radiolabeling approach.
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Affiliation(s)
- Jason B White
- Department of Biomedical Engineering, University of California, Davis, Davis, CA
| | - David L Boucher
- Department of Biomedical Engineering, University of California, Davis, Davis, CA
| | - Kirstin A Zettlitz
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - Anna M Wu
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - Julie L Sutcliffe
- Department of Biomedical Engineering, University of California, Davis, Davis, CA; Division of Hematology/Oncology, Department of Internal Medicine, University of California, Davis, Sacramento, CA; Center for Molecular and Genomic Imaging, University of California, Davis, Davis, CA; Radiochemistry Research and Training Facility, University of California, Davis, Sacramento, CA.
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Li K, Zettlitz KA, Lipianskaya J, Zhou Y, Marks JD, Mallick P, Reiter RE, Wu AM. A fully human scFv phage display library for rapid antibody fragment reformatting. Protein Eng Des Sel 2015; 28:307-16. [PMID: 25991864 DOI: 10.1093/protein/gzv024] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 04/15/2015] [Indexed: 12/21/2022] Open
Abstract
Phage display libraries of human single-chain variable fragments (scFvs) are a reliable source of fully human antibodies for scientific and clinical applications. Frequently, scFvs form the basis of larger, bivalent formats to increase valency and avidity. A small and versatile bivalent antibody fragment is the diabody, a cross-paired scFv dimer (∼55 kDa). However, generation of diabodies from selected scFvs requires decreasing the length of the interdomain scFv linker, typically by overlap PCR. To simplify this process, we designed two scFv linkers with integrated restriction sites for easy linker length reduction (17-residue to 7-residue or 18-residue to 5-residue, respectively) and generated two fully human scFv phage display libraries. The larger library (9 × 10(9) functional members) was employed for selection against a model antigen, human N-cadherin, yielding novel scFv clones with low nanomolar monovalent affinities. ScFv clones from both libraries were reformatted into diabodies by restriction enzyme digestion and re-ligation. Size-exclusion chromatography analysis confirmed the proper dimerization of most of the diabodies. In conclusion, these specially designed scFv phage display libraries allow us to rapidly reformat the selected scFvs into diabodies, which can greatly accelerate early stage antibody development when bivalent fragments are needed for candidate screening.
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Affiliation(s)
- Keyu Li
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, 570 Westwood Plaza, Box 951770, Los Angeles, CA 90095, USA
| | - Kirstin A Zettlitz
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, 570 Westwood Plaza, Box 951770, Los Angeles, CA 90095, USA
| | - Julia Lipianskaya
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, 570 Westwood Plaza, Box 951770, Los Angeles, CA 90095, USA
| | - Yu Zhou
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco General Hospital, 1001 Potrero Ave, Rm 3C-38, San Francisco, CA 94110, USA
| | - James D Marks
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco General Hospital, 1001 Potrero Ave, Rm 3C-38, San Francisco, CA 94110, USA
| | - Parag Mallick
- Canary Center for Cancer Early Detection, Stanford University, Palo Alto, CA 94304, USA
| | - Robert E Reiter
- Department of Urology, UCLA, Los Angeles, CA 90095, USA Molecular Biology Institute at UCLA, Los Angeles, CA 90095, USA Jonsson Comprehensive Cancer Center at UCLA, Los Angeles, CA 90095, USA
| | - Anna M Wu
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, 570 Westwood Plaza, Box 951770, Los Angeles, CA 90095, USA Jonsson Comprehensive Cancer Center at UCLA, Los Angeles, CA 90095, USA
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14
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Ilovich O, Natarajan A, Hori S, Sathirachinda A, Kimura R, Srinivasan A, Gebauer M, Kruip J, Focken I, Lange C, Carrez C, Sassoon I, Blanc V, Sarkar SK, Gambhir SS. Development and Validation of an Immuno-PET Tracer as a Companion Diagnostic Agent for Antibody-Drug Conjugate Therapy to Target the CA6 Epitope. Radiology 2015; 276:191-8. [PMID: 25734548 DOI: 10.1148/radiol.15140058] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
PURPOSE To develop and compare three copper 64 ((64)Cu)-labeled antibody fragments derived from a CA6-targeting antibody (huDS6) as immuno-positron emission tomography (immuno-PET)-based companion diagnostic agents for an antibody-drug conjugate by using huDS6. MATERIALS AND METHODS Three antibody fragments derived from huDS6 were produced, purified, conjugated to 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA), and evaluated in the following ways: (a) the affinity of the fragments and the DOTA conjugates was measured via flow cytometry, (b) the stability of the labeled fragments was determined ex vivo in human serum over 24 hours, and (c) comparison of the in vivo imaging potential of the fragments was evaluated in mice bearing subcutaneous CA6-positive and CA6-negative xenografts by using serial PET imaging and biodistribution. Isotype controls with antilysozyme and anti-DM4 B-Fabs and blocking experiments with an excess of either B-Fab or huDS6 were used to determine the extent of the antibody fragment (64)Cu-DOTA-B-Fab binding specificity. Immunoreactivity and tracer kinetics were evaluated by using cellular uptake and 48-hour imaging experiments, respectively. Statistical analyses were performed by using t tests, one-way analysis of variance, and Wilcoxon and Mann-Whitney tests. RESULTS The antibody fragment (64)Cu-DOTA-B-Fab was more than 95% stable after 24 hours in human serum, had an immunoreactivity of more than 70%, and allowed differentiation between CA6-positive and CA6-negative tumors in vivo as early as 6 hours after injection, with a 1.7-fold uptake ratio between tumors. Isotype and blocking studies experiments showed tracer-specific uptake in antigen-positive tumors, despite some nonspecific uptake in both tumor models. CONCLUSION Three antibody fragments were produced and examined as potential companion diagnostic agents. (64)Cu-DOTA-B-Fab is a stable and effective immuno-PET tracer for CA6 imaging in vivo.
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Affiliation(s)
- Ohad Ilovich
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Arutselvan Natarajan
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Sharon Hori
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Ataya Sathirachinda
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Richard Kimura
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Ananth Srinivasan
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Mathias Gebauer
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Jochen Kruip
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Ingo Focken
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Christian Lange
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Chantal Carrez
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Ingrid Sassoon
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Veronique Blanc
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Susanta K Sarkar
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
| | - Sanjiv S Gambhir
- From the Department of Radiology (O.I., A.N., S.H., A. Sathirachinda, R.K., A. Srinivasan, S.S.G.) and Departments of Bioengineering and Materials Science & Engineering (S.S.G.), Stanford University, 318 Campus Dr, Room E153, Stanford, CA 94305; Sanofi R&D, BioInnovation Novel Protein Therapeutics, Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany (M.G., J.K., I.F., C.L.); Sanofi Oncology, Vitry, France (C.C., I.S., V.B.); and Sanofi Oncology, Cambridge, Mass (S.K.S.)
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15
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Li K, Tavaré R, Zettlitz KA, Mumenthaler SM, Mallick P, Zhou Y, Marks JD, Wu AM. Anti-MET immunoPET for non-small cell lung cancer using novel fully human antibody fragments. Mol Cancer Ther 2014; 13:2607-17. [PMID: 25143449 PMCID: PMC4221648 DOI: 10.1158/1535-7163.mct-14-0363] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
MET, the receptor of hepatocyte growth factor, plays important roles in tumorigenesis and drug resistance in numerous cancers, including non-small cell lung cancer (NSCLC). As increasing numbers of MET inhibitors are being developed for clinical applications, antibody fragment-based immunopositron emission tomography (immunoPET) has the potential to rapidly quantify in vivo MET expression levels for drug response evaluation and patient stratification for these targeted therapies. Here, fully human single-chain variable fragments (scFvs) isolated from a phage display library were reformatted into bivalent cys-diabodies (scFv-cys dimers) with affinities to MET ranging from 0.7 to 5.1 nmol/L. The candidate with the highest affinity, H2, was radiolabeled with (89)Zr for immunoPET studies targeting NSCLC xenografts: low MET-expressing Hcc827 and the gefitinib-resistant Hcc827-GR6 with 4-fold MET overexpression. ImmunoPET at as early as 4 hours after injection produced high-contrast images, and ex vivo biodistribution analysis at 20 hours after injection showed about 2-fold difference in tracer uptake levels between the parental and resistant tumors (P < 0.01). Further immunoPET studies using a larger fragment, the H2 minibody (scFv-CH3 dimer), produced similar results at later time points. Two of the antibody clones (H2 and H5) showed in vitro growth inhibitory effects on MET-dependent gefitinib-resistant cell lines, whereas no effects were observed on resistant lines lacking MET activation. In conclusion, these fully human antibody fragments inhibit MET-dependent cancer cells and enable rapid immunoPET imaging to assess MET expression levels, showing potential for both therapeutic and diagnostic applications.
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Affiliation(s)
- Keyu Li
- Department of Molecular and Medical Pharmacology, Crump Institute for Molecular Imaging, David Geffen School of Medicine at UCLA, Los Angeles, California
| | - Richard Tavaré
- Department of Molecular and Medical Pharmacology, Crump Institute for Molecular Imaging, David Geffen School of Medicine at UCLA, Los Angeles, California
| | - Kirstin A Zettlitz
- Department of Molecular and Medical Pharmacology, Crump Institute for Molecular Imaging, David Geffen School of Medicine at UCLA, Los Angeles, California
| | - Shannon M Mumenthaler
- Center for Applied Molecular Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Parag Mallick
- Center for Applied Molecular Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California. Department of Radiology, School of Medicine, Stanford University, Stanford, California
| | - Yu Zhou
- Department of Anesthesia, University of California, San Francisco, San Francisco General Hospital, San Francisco, California
| | - James D Marks
- Department of Anesthesia, University of California, San Francisco, San Francisco General Hospital, San Francisco, California
| | - Anna M Wu
- Department of Molecular and Medical Pharmacology, Crump Institute for Molecular Imaging, David Geffen School of Medicine at UCLA, Los Angeles, California.
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16
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Tavaré R, Wu WH, Zettlitz KA, Salazar FB, McCabe KE, Marks JD, Wu AM. Enhanced immunoPET of ALCAM-positive colorectal carcinoma using site-specific ⁶⁴Cu-DOTA conjugation. Protein Eng Des Sel 2014; 27:317-24. [PMID: 25095796 DOI: 10.1093/protein/gzu030] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Activated leukocyte cell adhesion molecule (ALCAM) is an immunoglobulin superfamily cell adhesion molecule that is aberrantly expressed in a wide variety of human tumors, including melanoma, prostate cancer, breast cancer, colorectal carcinoma, bladder cancer and pancreatic adenocarcinoma. This wide spectrum of human malignancies makes ALCAM a prospective pan-cancer immunoPET target to aid in detection and diagnosis in multiple malignancies. In this study, we assess site-specific versus non-site-specific conjugation strategies for (64)Cu-DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) immunoPET imaging of a fully human ALCAM cys-diabody (cDb) with a reduced linker length that retains its bivalent binding ability. ALCAM constructs with linker lengths of eight, five and three amino acids were produced to make true non-covalent site-specifically modified cDbs. Characterization by gel electrophoresis, size exclusion chromatography, flow cytometry and mass spectrometry of the various constructs was performed. To demonstrate the increased utility of targeting multiple malignancies expressing ALCAM, we compare the targeting of the site-specific versus non-site-specific conjugated cDbs to the human colorectal cancer xenograft LS174T. Interestingly, the conjugation strategy not only affects tumor targeting but also hepatic and renal uptake/clearance.
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Affiliation(s)
- Richard Tavaré
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Wei H Wu
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Kirstin A Zettlitz
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Felix B Salazar
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Katelyn E McCabe
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - James D Marks
- Department of Anesthesia, UCSF, San Francisco General Hospital, San Francisco, CA 94110, USA
| | - Anna M Wu
- Crump Institute for Molecular Imaging, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
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17
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Shazeeb MS, Gupta S, Bogdanov A. MR signal amplification for imaging of the mutant EGF receptor in orthotopic human glioma model. Mol Imaging Biol 2014; 15:675-84. [PMID: 23733229 DOI: 10.1007/s11307-013-0653-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
PURPOSE To investigate the potential of targeted MR signal amplification strategy for imaging of EGF receptor variant III (EGFRvIII) overexpression associated with the infiltrating margin of aggressive orthotopic brain tumors. PROCEDURES F(ab')2 fragments of humanized anti-EGFRvIII monoclonal antibody (EMD72000) were linked to deglycosylated horseradish peroxidase (HRP) and glucose oxidase (GOX). Detection of the F(ab')2 conjugate pair colocalization in vivo was enabled by a subsequent IV injection of a low molecular weight paramagnetic substrate of HRP, diTyr-GdDTPA. RESULTS The delivery of the targeted fragments to the tumor was validated using SPECT/CT imaging of radiolabeled anti-EGFRvIII F(ab')2 conjugates. Further, by using 3 T MRI, we observed time-dependent differences in tumor signal intensity and signal retention at the endpoint depending on whether or not the animals were pre-injected with the anti-EGFRvIII F(ab')2 conjugates. CONCLUSIONS Imaging of EGFRvIII expression in vivo was enabled by consecutive administration of targeted F(ab')2 conjugates and a paramagnetic substrate resulting in a tumor-specific receptor detection with high specificity and resolution.
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Affiliation(s)
- Mohammed Salman Shazeeb
- Department of Radiology, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA, 01655, USA
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18
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Kampmeier F, Williams JD, Maher J, Mullen GE, Blower PJ. Design and preclinical evaluation of a 99mTc-labelled diabody of mAb J591 for SPECT imaging of prostate-specific membrane antigen (PSMA). EJNMMI Res 2014; 4:13. [PMID: 24602403 PMCID: PMC4015168 DOI: 10.1186/2191-219x-4-13] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Accepted: 02/26/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Sensitive and specific detection of nodal status, sites of metastases and low-volume recurrent disease could greatly improve management of patients with advanced prostate cancer. Prostate-specific membrane antigen (PSMA) is a well-established marker for prostate carcinoma with increased levels of expression in high-grade, hormone-refractory and metastatic disease. The monoclonal antibody (mAb) J591 is directed against an extracellular epitope of PSMA and has been shown to efficiently target disseminated disease including metastases in lymph nodes and bone. Its use as a diagnostic imaging agent however is limited due to its slow pharmacokinetics. In this study a diabody derived from mAb J591 was developed as a single photon emission computed tomography (SPECT) tracer with improved pharmacokinetics for the detection of PSMA expression in prostate cancer. METHODS A diabody in VH-VL orientation and with a C-terminal cysteine was expressed in HEK293T cells and purified by a combination of metal ion affinity and size exclusion chromatography. Specificity and affinity were determined in cell binding studies. For SPECT imaging, the diabody was site-specifically labelled with [99mTc(CO)3]+ via the C-terminal His tag and evaluated in a subcutaneous DU145/DU145-PSMA prostate carcinoma xenograft model. RESULTS J591C diabody binds to PSMA-expressing cells with low nanomolar affinity (3.3 ± 0.2 nM). SPECT studies allowed imaging of tumour xenografts with high contrast from 4 h post injection (p.i.). Ex vivo biodistribution studies showed peak tumour uptake of the tracer of 12.1% ± 1.7% injected dose (ID)/g at 8 h p.i. with a tumour to blood ratio of 8.0. Uptake in PSMA-negative tumours was significantly lower with 6.3% ± 0.5% at 8 h p.i. (p < 0.001). CONCLUSION The presented diabody has favourable properties required to warrant its further development for antibody-based imaging of PSMA expression in prostate cancer, including PSMA-specific uptake, favourable pharmacokinetics compared to the parental antibody and efficient site-specific radiolabelling with 99mTc.
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Affiliation(s)
- Florian Kampmeier
- Division of Imaging Sciences and Biomedical Engineering, King's College London, 4th Floor Lambeth Wing, St. Thomas' Hospital, London SE1 7EH, UK
| | - Jennifer D Williams
- Division of Imaging Sciences and Biomedical Engineering, King's College London, 4th Floor Lambeth Wing, St. Thomas' Hospital, London SE1 7EH, UK
| | - John Maher
- Department of Research Oncology, King's Health Partners Integrated Cancer Centre, King's College London, Guy's Hospital Campus, Great Maze Pond, London SE1 9RT, UK
- Department of Immunology, Barnet and Chase Farm NHS Trust, Barnet, Hertfordshire EN5 3DJ, UK
- Department of Clinical Immunology and Allergy, King's College Hospital NHS Foundation Trust, Denmark Hill, London SE5 9RS, UK
| | - Gregory E Mullen
- Division of Imaging Sciences and Biomedical Engineering, King's College London, 4th Floor Lambeth Wing, St. Thomas' Hospital, London SE1 7EH, UK
| | - Philip J Blower
- Division of Imaging Sciences and Biomedical Engineering, King's College London, 4th Floor Lambeth Wing, St. Thomas' Hospital, London SE1 7EH, UK
- Division of Chemistry, King's College London, Britannia House, 7 Trinity St, London SE1 1DB, UK
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19
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Engineered antibodies for molecular imaging of cancer. Methods 2013; 65:139-47. [PMID: 24091005 DOI: 10.1016/j.ymeth.2013.09.015] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Accepted: 09/23/2013] [Indexed: 12/12/2022] Open
Abstract
Antibody technology has transformed drug development, providing robust approaches to producing highly targeted and active therapeutics that can routinely be advanced through clinical evaluation and registration. In parallel, there is an emerging need to access similarly targeted agents for diagnostic purposes, including non-invasive imaging in preclinical models and patients. Antibody engineering enables modification of key properties (immunogenicity, valency, biological inertness, pharmacokinetics, clearance route, site-specific conjugation) in order to produce targeting agents optimized for molecular imaging. Expanded availability of positron-emitting radionuclides has led to a resurgence of interest and applications of immunoPET (immuno-positron emission tomography). Molecular imaging using engineered antibodies and fragments provides a general approach for assessing cell surface phenotype in vivo and stands to play an increasingly important role in cancer diagnosis, treatment selection, and monitoring of molecularly targeted therapeutics.
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Knowles SM, Wu AM. Advances in immuno-positron emission tomography: antibodies for molecular imaging in oncology. J Clin Oncol 2012; 30:3884-92. [PMID: 22987087 PMCID: PMC3478579 DOI: 10.1200/jco.2012.42.4887] [Citation(s) in RCA: 142] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2012] [Accepted: 07/20/2012] [Indexed: 01/20/2023] Open
Abstract
Identification of cancer cell-surface biomarkers and advances in antibody engineering have led to a sharp increase in the development of therapeutic antibodies. These same advances have led to a new generation of radiolabeled antibodies and antibody fragments that can be used as cancer-specific imaging agents, allowing quantitative imaging of cell-surface protein expression in vivo. Immuno-positron emission tomography (immunoPET) imaging with intact antibodies has shown success clinically in diagnosing and staging cancer. Engineered antibody fragments, such as diabodies, minibodies, and single-chain Fv (scFv) -Fc, have been successfully employed for immunoPET imaging of cancer cell-surface biomarkers in preclinical models and are poised to bring same-day imaging into clinical development. ImmunoPET can potentially provide a noninvasive approach for obtaining target-specific information useful for titrating doses for radioimmunotherapy, for patient risk stratification and selection of targeted therapies, for evaluating response to therapy, and for predicting adverse effects, thus contributing to the ongoing development of personalized cancer treatment.
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Affiliation(s)
- Scott M. Knowles
- All authors: David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA
| | - Anna M. Wu
- All authors: David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA
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Enhanced growth inhibition of osteosarcoma by cytotoxic polymerized liposomal nanoparticles targeting the alcam cell surface receptor. Sarcoma 2012; 2012:126906. [PMID: 23024593 PMCID: PMC3447386 DOI: 10.1155/2012/126906] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2012] [Accepted: 07/03/2012] [Indexed: 11/17/2022] Open
Abstract
Osteosarcoma is the most common primary malignancy of bone in children, adolescents, and adults. Despite extensive surgery and adjuvant aggressive high-dose systemic chemotherapy with potentially severe bystander side effects, cure is attainable in about 70% of patients with localized disease and only 20%-30% of those patients with metastatic disease. Targeted therapies clearly are warranted in improving our treatment of this adolescent killer. However, a lack of osteosarcoma-associated/specific markers has hindered development of targeted therapeutics. We describe a novel osteosarcoma-associated cell surface antigen, ALCAM. We, then, create an engineered anti-ALCAM-hybrid polymerized liposomal nanoparticle immunoconjugate (α-AL-HPLN) to specifically target osteosarcoma cells and deliver a cytotoxic chemotherapeutic agent, doxorubicin. We have demonstrated that α-AL-HPLNs have significantly enhanced cytotoxicity over untargeted HPLNs and over a conventional liposomal doxorubicin formulation. In this way, α-AL-HPLNs are a promising new strategy to specifically deliver cytotoxic agents in osteosarcoma.
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