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Horgan CC, Bergholt MS, Nagelkerke A, Thin MZ, Pence IJ, Kauscher U, Kalber TL, Stuckey DJ, Stevens MM. Integrated photodynamic Raman theranostic system for cancer diagnosis, treatment, and post-treatment molecular monitoring. Theranostics 2021; 11:2006-2019. [PMID: 33408795 PMCID: PMC7778600 DOI: 10.7150/thno.53031] [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] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 11/25/2020] [Indexed: 12/16/2022] Open
Abstract
Theranostics, the combination of diagnosis and therapy, has long held promise as a means to achieving personalised precision cancer treatments. However, despite its potential, theranostics has yet to realise significant clinical translation, largely due the complexity and overriding toxicity concerns of existing theranostic nanoparticle strategies. Methods: Here, we present an alternative nanoparticle-free theranostic approach based on simultaneous Raman spectroscopy and photodynamic therapy (PDT) in an integrated clinical platform for cancer theranostics. Results: We detail the compatibility of Raman spectroscopy and PDT for cancer theranostics, whereby Raman spectroscopic diagnosis can be performed on PDT photosensitiser-positive cells and tissues without inadvertent photosensitiser activation/photobleaching or impaired diagnostic capacity. We further demonstrate that our theranostic platform enables in vivo tumour diagnosis, treatment, and post-treatment molecular monitoring in real-time. Conclusion: This system thus achieves effective theranostic performance, providing a promising new avenue towards the clinical realisation of theranostics.
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Affiliation(s)
- Conor C. Horgan
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
| | - Mads S. Bergholt
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
| | - Anika Nagelkerke
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
| | - May Zaw Thin
- Centre for Advanced Biomedical Imaging, University College London, London WC1E 6DD, UK
| | - Isaac J. Pence
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
| | - Ulrike Kauscher
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
| | - Tammy L. Kalber
- Centre for Advanced Biomedical Imaging, University College London, London WC1E 6DD, UK
| | - Daniel J. Stuckey
- Centre for Advanced Biomedical Imaging, University College London, London WC1E 6DD, UK
| | - Molly M. Stevens
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
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Finnerty E, Ramasawmy R, O’Callaghan J, Connell JJ, Lythgoe M, Shmueli K, Thomas DL, Walker‐Samuel S. Noninvasive quantification of oxygen saturation in the portal and hepatic veins in healthy mice and those with colorectal liver metastases using QSM MRI. Magn Reson Med 2019; 81:2666-2675. [PMID: 30450573 PMCID: PMC6588010 DOI: 10.1002/mrm.27571] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 09/10/2018] [Accepted: 09/26/2018] [Indexed: 12/30/2022]
Abstract
PURPOSE This preclinical study investigated the use of QSM MRI to noninvasively measure venous oxygen saturation (SvO2) in the hepatic and portal veins. METHODS QSM data were acquired from a cohort of healthy mice (n = 10) on a 9.4 Tesla MRI scanner under normoxic and hyperoxic conditions. Susceptibility was measured in the portal and hepatic veins and used to calculate SvO2 in each vessel under each condition. Blood was extracted from the inferior vena cava of 3 of the mice under each condition, and SvO2 was measured with a blood gas analyzer for comparison. QSM data were also acquired from a cohort of mice bearing liver tumors under normoxic conditions. Susceptibility was measured, and SvO2 calculated in the portal and hepatic veins and compared to the healthy mice. Statistical significance was assessed using a Wilcoxon matched-pairs signed rank test (normoxic vs. hyperoxic) or a Mann-Whitney test (healthy vs. tumor bearing). RESULTS SvO2 calculated from QSM measurements in healthy mice under hyperoxia showed significant increases of 15% in the portal vein (P < 0.05) and 21% in the hepatic vein (P < 0.01) versus normoxia. These values agreed with inferior vena cava measurements from the blood gas analyzer (26% increase). SvO2 in the hepatic vein was significantly lower in the colorectal liver metastases cohort (30% ± 11%) than the healthy mice (53% ± 17%) (P < 0.05); differences in the portal vein were not significant. CONCLUSION QSM is a feasible tool for noninvasively measuring SvO2 in the liver and can detect differences due to increased oxygen consumption in livers bearing colorectal metastases.
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Affiliation(s)
- Eoin Finnerty
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonUnited Kingdom
| | - Rajiv Ramasawmy
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonUnited Kingdom
| | - James O’Callaghan
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonUnited Kingdom
| | - John J. Connell
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonUnited Kingdom
| | - Mark Lythgoe
- Department of MedicineUCL Institute of Child Health, University College LondonLondonUnited Kingdom
| | - Karin Shmueli
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonUnited Kingdom
| | - David L. Thomas
- Institute of NeurologyUniversity College LondonLondonUnited Kingdom
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Ramasawmy R, Johnson SP, Roberts TA, Stuckey DJ, David AL, Pedley RB, Lythgoe MF, Siow B, Walker-Samuel S. Monitoring the Growth of an Orthotopic Tumour Xenograft Model: Multi-Modal Imaging Assessment with Benchtop MRI (1T), High-Field MRI (9.4T), Ultrasound and Bioluminescence. PLoS One 2016; 11:e0156162. [PMID: 27223614 PMCID: PMC4880291 DOI: 10.1371/journal.pone.0156162] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 05/10/2016] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Research using orthotopic and transgenic models of cancer requires imaging methods to non-invasively quantify tumour burden. As the choice of appropriate imaging modality is wide-ranging, this study aimed to compare low-field (1T) magnetic resonance imaging (MRI), a novel and relatively low-cost system, against established preclinical techniques: bioluminescence imaging (BLI), ultrasound imaging (US), and high-field (9.4T) MRI. METHODS A model of colorectal metastasis to the liver was established in eight mice, which were imaged with each modality over four weeks post-implantation. Tumour burden was assessed from manually segmented regions. RESULTS All four imaging systems provided sufficient contrast to detect tumours in all of the mice after two weeks. No significant difference was detected between tumour doubling times estimated by low-field MRI, ultrasound imaging or high-field MRI. A strong correlation was measured between high-field MRI estimates of tumour burden and all the other modalities (p < 0.001, Pearson). CONCLUSION These results suggest that both low-field MRI and ultrasound imaging are accurate modalities for characterising the growth of preclinical tumour models.
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Affiliation(s)
- Rajiv Ramasawmy
- UCL Centre for Advanced Biomedical Imaging, Division of Medicine, London, United Kingdom
- UCL Cancer Institute, London, United Kingdom
| | - S. Peter Johnson
- UCL Centre for Advanced Biomedical Imaging, Division of Medicine, London, United Kingdom
- UCL Cancer Institute, London, United Kingdom
| | - Thomas A. Roberts
- UCL Centre for Advanced Biomedical Imaging, Division of Medicine, London, United Kingdom
| | - Daniel J. Stuckey
- UCL Centre for Advanced Biomedical Imaging, Division of Medicine, London, United Kingdom
| | - Anna L. David
- UCL Institute for Women’s Health, London, United Kingdom
| | | | - Mark F. Lythgoe
- UCL Centre for Advanced Biomedical Imaging, Division of Medicine, London, United Kingdom
| | - Bernard Siow
- UCL Centre for Advanced Biomedical Imaging, Division of Medicine, London, United Kingdom
| | - Simon Walker-Samuel
- UCL Centre for Advanced Biomedical Imaging, Division of Medicine, London, United Kingdom
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Johnson SP, Ramasawmy R, Campbell-Washburn AE, Wells JA, Robson M, Rajkumar V, Lythgoe MF, Pedley RB, Walker-Samuel S. Acute changes in liver tumour perfusion measured non-invasively with arterial spin labelling. Br J Cancer 2016; 114:897-904. [PMID: 27031853 PMCID: PMC4984798 DOI: 10.1038/bjc.2016.51] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 01/26/2016] [Accepted: 02/04/2016] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Non-invasive measures of tumour vascular perfusion are desirable, in order to assess response to vascular targeting (or modifying) therapies. In this study, hepatic arterial spin labelling (ASL) magnetic resonance imaging (MRI) was investigated to measure acute changes in perfusion of colorectal cancer in the liver, in response to vascular disruption therapy with OXi4503. METHODS SW1222 and LS174T tumours were established in the liver of MF1 nu/nu mice via intrasplenic injection. Perfusion and R2(*) MRI measurements were acquired with an Agilent 9.4T horizontal bore scanner, before and at 90 min after 40 mg kg(-1) OXi4503. RESULTS A significant decrease in SW1222 tumour perfusion was observed (-43±33%, P<0.005). LS174T tumours had a significantly lower baseline level of perfusion. Intrinsic susceptibility MRI showed a significant increase in R2(*) in LS174T tumours (28±25%, P<0.05). An association was found between the change in tumour perfusion and the proximity to large vessels, with pre-treatment blood flow predictive of subsequent response. Histological evaluation confirmed the onset of necrosis and evidence of heterogeneous response between tumour deposits. CONCLUSIONS Hepatic ASL-MRI can detect acute response to targeted tumour vascular disruption entirely non-invasively. Hepatic ASL of liver tumours has potential for use in a clinical setting.
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Affiliation(s)
- S Peter Johnson
- UCL Cancer Institute, University College London, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6DD, UK
- UCL Centre for Advanced Biomedical Imaging, University College London, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6DD, UK
| | - Rajiv Ramasawmy
- UCL Cancer Institute, University College London, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6DD, UK
- UCL Centre for Advanced Biomedical Imaging, University College London, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6DD, UK
| | - Adrienne E Campbell-Washburn
- UCL Centre for Advanced Biomedical Imaging, University College London, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6DD, UK
- Cardiovascular and Pulmonary Branch, Division of Intramural Research, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Jack A Wells
- UCL Centre for Advanced Biomedical Imaging, University College London, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6DD, UK
| | - Mathew Robson
- UCL Cancer Institute, University College London, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6DD, UK
| | - Vineeth Rajkumar
- UCL Cancer Institute, University College London, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6DD, UK
| | - Mark F Lythgoe
- UCL Centre for Advanced Biomedical Imaging, University College London, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6DD, UK
| | - R Barbara Pedley
- UCL Cancer Institute, University College London, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6DD, UK
| | - Simon Walker-Samuel
- UCL Centre for Advanced Biomedical Imaging, University College London, Paul O'Gorman Building, 72 Huntley Street, London WC1E 6DD, UK
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Ramasawmy R, Campbell-Washburn AE, Wells JA, Johnson SP, Pedley RB, Walker-Samuel S, Lythgoe MF. Hepatic arterial spin labelling MRI: an initial evaluation in mice. NMR IN BIOMEDICINE 2015; 28:272-80. [PMID: 25522098 PMCID: PMC4670473 DOI: 10.1002/nbm.3251] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Revised: 10/09/2014] [Accepted: 11/26/2014] [Indexed: 05/20/2023]
Abstract
The development of strategies to combat hepatic disease and augment tissue regeneration has created a need for methods to assess regional liver function. Liver perfusion imaging has the potential to fulfil this need, across a range of hepatic diseases, alongside the assessment of therapeutic response. In this study, the feasibility of hepatic arterial spin labelling (HASL) was assessed for the first time in mice at 9.4 T, its variability and repeatability were evaluated, and it was applied to a model of colorectal liver metastasis. Data were acquired using flow-sensitive alternating inversion recovery-arterial spin labelling (FAIR-ASL) with a Look-Locker readout, and analysed using retrospective respiratory gating and a T1 -based quantification. This study shows that preclinical HASL is feasible and exhibits good repeatability and reproducibility. Mean estimated liver perfusion was 2.2 ± 0.8 mL/g/min (mean ± standard error, n = 10), which agrees well with previous measurements using invasive approaches. Estimates of the variation gave a within-session coefficient of variation (CVWS) of 7%, a between-session coefficient of variation (CVBS) of 9% and a between-animal coefficient of variation (CVA) of 15%. The within-session Bland-Altman repeatability coefficient (RCWS) was 18% and the between-session repeatability coefficient (RCBS) was 29%. Finally, the HASL method was applied to a mouse model of liver metastasis, in which significantly lower mean perfusion (1.1 ± 0.5 mL/g/min, n = 6) was measured within the tumours, as seen by fluorescence histology. These data indicate that precise and accurate liver perfusion estimates can be achieved using ASL techniques, and provide a platform for future studies investigating hepatic perfusion in mouse models of disease.
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Affiliation(s)
- R Ramasawmy
- UCL Centre for Advanced Biomedical ImagingPaul O'Gorman Building, London, UK
- UCL Cancer InstitutePaul O'Gorman Building, London, UK
| | | | - J A Wells
- UCL Centre for Advanced Biomedical ImagingPaul O'Gorman Building, London, UK
| | - S P Johnson
- UCL Centre for Advanced Biomedical ImagingPaul O'Gorman Building, London, UK
- UCL Cancer InstitutePaul O'Gorman Building, London, UK
| | - R B Pedley
- UCL Cancer InstitutePaul O'Gorman Building, London, UK
| | - S Walker-Samuel
- UCL Centre for Advanced Biomedical ImagingPaul O'Gorman Building, London, UK
| | - M F Lythgoe
- UCL Centre for Advanced Biomedical ImagingPaul O'Gorman Building, London, UK
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Gene therapy and imaging in preclinical and clinical oncology: recent developments in therapy and theranostics. Ther Deliv 2014; 5:1275-96. [DOI: 10.4155/tde.14.87] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
In the case of disseminated cancer, current treatment options reach their limit. Gene theranostics emerge as an innovative route in the treatment and diagnosis of cancer and might pave the way towards development of an efficacious treatment of currently incurable cancer. Various gene vectors have been developed to realize tumor-specific nucleic acid delivery and are considered crucial for the successful application of cancer gene therapy. By adding reporter genes and imaging agents, these systems gain an additional diagnostic function, thereby advancing the theranostic paradigm into cancer gene therapy. Numerous preclinical studies have demonstrated the feasibility of combined tumor gene therapy and diagnostic imaging, and clinical trials in human and veterinary oncology have been executed with partly encouraging results.
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Eriksson SE, Elgström E, Bäck T, Ohlsson T, Jensen H, Nilsson R, Lindegren S, Tennvall J. Sequential Radioimmunotherapy with 177Lu- and 211At-Labeled Monoclonal Antibody BR96 in a Syngeneic Rat Colon Carcinoma Model. Cancer Biother Radiopharm 2014; 29:238-46. [DOI: 10.1089/cbr.2014.1625] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
| | - Erika Elgström
- Department of Oncology and Pathology, Lund University, Lund, Sweden
| | - Tom Bäck
- Department of Radiation Physics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Tomas Ohlsson
- Department of Medical Radiation Physics, Lund University, Lund, Sweden
| | - Holger Jensen
- Cyclotron and PET Unit, Rigshospitalet, Copenhagen, Denmark
| | - Rune Nilsson
- Department of Oncology and Pathology, Lund University, Lund, Sweden
| | - Sture Lindegren
- Department of Radiation Physics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Jan Tennvall
- Department of Oncology and Pathology, Lund University, Lund, Sweden
- Department of Oncology, Skåne University Hospital, Lund, Sweden
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Örbom A, Eriksson SE, Elgström E, Ohlsson T, Nilsson R, Tennvall J, Strand SE. The Intratumoral Distribution of Radiolabeled 177Lu-BR96 Monoclonal Antibodies Changes in Relation to Tumor Histology over Time in a Syngeneic Rat Colon Carcinoma Model. J Nucl Med 2013; 54:1404-10. [DOI: 10.2967/jnumed.112.117028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Eriksson SE, Bäck T, Elgström E, Jensen H, Nilsson R, Lindegren S, Tennvall J. Successful radioimmunotherapy of established syngeneic rat colon carcinoma with 211At-mAb. EJNMMI Res 2013; 3:23. [PMID: 23557183 PMCID: PMC3621254 DOI: 10.1186/2191-219x-3-23] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Accepted: 03/18/2013] [Indexed: 02/05/2023] Open
Abstract
Background Most carcinomas are prone to metastasize despite successful treatment of the primary tumor. One way to address this clinical challenge may be targeted therapy with α-emitting radionuclides such as astatine-211 (211At). Radioimmunotherapy utilizing α-particle emitting radionuclides is considered especially suitable for the treatment of small cell clusters and single cells, although lesions of different sizes may also be present in the patient. The aim of this study was primarily to evaluate the toxicity and secondarily in vivo efficacy of a 211At-labeled monoclonal antibody (mAb) directed against colon carcinoma with tumor diameters of approximately 10 mm. Methods Eighteen rats with subperitoneal syngeneic colon carcinoma were allocated to three groups of six animals together with three healthy rats in each group. The groups were injected intravenously with either 150 μg of unlabeled mAbs (controls) or 2.5 or 5 MBq 211At-mAbs directed towards the Lewis Y antigen expressed on the cell membrane of several carcinomas. Tumor volume, body weight, and blood cell counts were monitored for 100 days after treatment. Results Local tumors were non-palpable in five out of six rats after treatment with both activities of 211At-mAbs, compared to one out of six in the control group. At the study end, half of the animals in each group given 211At-BR96 and one animal in the control group were free from disease. Radioimmunotherapy resulted in dose-dependent, transient weight loss and myelotoxicity. Survival was significantly better in the groups receiving targeted alpha therapy than in those receiving unlabeled mAbs. Conclusions This study demonstrates the possibility of treating small, solid colon carcinoma tumors with α-emitting radionuclides such as 211At bound to mAbs, with tolerable toxicity.
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Affiliation(s)
- Sophie E Eriksson
- Division of Oncology, Department of Clinical Sciences, Lund University, Barngatan 2B, Lund 221 85, Sweden.
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Yan R, Sander K, Galante E, Rajkumar V, Badar A, Robson M, El-Emir E, Lythgoe MF, Pedley RB, Årstad E. A one-pot three-component radiochemical reaction for rapid assembly of 125I-labeled molecular probes. J Am Chem Soc 2013; 135:703-9. [PMID: 23194416 DOI: 10.1021/ja307926g] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Nuclear imaging in conjunction with radioactive tracers enables noninvasive measurements of biochemical events in vivo. However, access to tracers remains limited due to the lack of methods for rapid assembly of radiolabeled molecules with the prerequisite biological activity. Herein, we report a one-pot, three-component, copper(II)-mediated reaction of azides, alkynes, and [(125)I]iodide to yield 5-[(125)I]iodo-1,2,3-triazoles. Using a selection of azides and alkynes in a combinatorial approach, we have synthesized a library of structurally diverse (125)I-labeled triazoles functionalized with bioconjugation groups, fluorescent dyes, and biomolecules. Our preliminary biological evaluation suggests that 5-[(125)I]iodo-1,2,3-triazoles are resistant to deiodination in vivo, both as small molecular probes and as antibody conjugates. The ability to incorporate radioactive iodide into triazoles directly from the parent azides and alkynes makes the method broadly applicable and offers the potential to rapidly assemble molecular probes from an array of structurally diverse, and readily available, building blocks.
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Affiliation(s)
- Ran Yan
- Institute of Nuclear Medicine and Department of Chemistry, University College London, 235 Euston Road (T-5), London NW1 2BU, UK
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Systemic TNFα gene therapy synergizes with liposomal doxorubicine in the treatment of metastatic cancer. Mol Ther 2012; 21:300-8. [PMID: 23299796 DOI: 10.1038/mt.2012.229] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Tumor necrosis factor alpha (TNFα) is a potent antitumoral cytokine, either killing tumor cells directly or affecting the tumor vasculature leading to enhanced accumulation of macromolecular drugs. Due to dose limiting side effects systemic administration of TNFα protein at therapeutically active doses is precluded. With gene vectors, tumor restricted TNFα expression can be achieved and in principle synergize with chemotherapy. Synthetic gene carriers based on polyamines were intravenously injected, which either passively accumulate within the tumor or specifically target the epidermal growth factor receptor. A single intravenous injection of TNFα gene vector promoted accumulation of liposomal doxorubicine (Doxil) in murine neuroblastoma and human hepatoma by enhancing tumor endothelium permeability. The expression of transgenic TNFα was restricted to tumor tissue. Three treatment cycles with TNFα gene vectors and Doxil significantly delayed tumor growth in subcutaneous murine Neuro2A neuroblastoma. Also tumors re-growing after initial treatment were successfully treated in a fourth cycle pointing at the absence of resistance mechanisms. Systemic Neuro2A metastases or human LS174T colon carcinoma metastases in liver were also successfully treated with this combined approach. In conclusion, this schedule opens the possibility for the efficient treatment of tumors metastases otherwise not accessible for macromolecular drug carriers.
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A comparative study of PDGFR inhibition with imatinib on radiolabeled antibody targeting and clearance in two pathologically distinct models of colon adenocarcinoma. Tumour Biol 2012; 33:2019-29. [PMID: 22833213 DOI: 10.1007/s13277-012-0461-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Accepted: 07/04/2012] [Indexed: 10/28/2022] Open
Abstract
The potential of radioimmunotherapy to selectively kill tumour cells is well established. However, optimisation is required with regards to increasing tumour localisation of antibodies. We used the PDGF-receptor inhibitor imatinib mesylate to improve tumour-specific antibody localisation in two models of colorectal adenocarcinoma and correlated antibody localisation with changes to tumour microvasculature. Mice bearing human colorectal xenografts (LS174T or SW1222) were treated with imatinib prior to administration of radiolabeled anti-CEA antibodies ((125)I-A5B7). Whole tumour and regional localisation of radiolabeled antibodies were measured. Microvessel density and pericyte coverage were quantified in whole tumours and correlated with (125)I-A5B7 localisation. Imatinib increased uptake of (125)I-A5B7 in LS174T but not SW1222 tumours after 48 h (p < 0.05). Imatinib reduced microvessel density in both models (p < 0.05) but reduced pericyte attachment to endothelial cells only in SW1222 xenografts (p < 0.05). Imatinib increases antibody distribution in LS174T tumours but not SW1222 tumours, and this correlated to changes in tumour microvessels. Accelerated clearance of radiolabeled antibody from normal tissues in both models resulted in enhanced tumour to normal tissue ratios. This improvement in tumour/normal tissue ratio has potential clinical benefit from a therapy and imaging perspective, and merits further investigation.
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Marcucci F, Corti A. How to improve exposure of tumor cells to drugs: promoter drugs increase tumor uptake and penetration of effector drugs. Adv Drug Deliv Rev 2012; 64:53-68. [PMID: 21983328 DOI: 10.1016/j.addr.2011.09.007] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 08/13/2011] [Accepted: 09/20/2011] [Indexed: 12/11/2022]
Abstract
Solid tumors are characterized by an abnormal architecture and composition that limit the uptake and distribution of antitumor drugs. Over the last two decades, drugs have been identified that improve the tumor uptake and distribution of drugs that have direct antitumor effects. We propose to refer to these drugs as promoter drugs, and as effector drugs to drugs that have direct antitumor effects. Some promoter drugs have received regulatory approval, while others are in active clinical development. This review gives an overview of promoter drugs, by classifying them according to their mechanism of action: promoter drugs that modulate tumor blood flow, modify the barrier function of tumor vessels, induce tumor cell killing, and overcome stromal barriers. Eventually, we discuss those that we feel are the main conclusions to be drawn from promoter drug research that has been performed so far, and suggest areas of future investigation to improve the efficacy of promoter drugs in cancer therapy.
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Affiliation(s)
- Fabrizio Marcucci
- Centro Nazionale di Epidemiologia, Sorveglianza e Promozione della Salute (CNESPS), Istituto Superiore di Sanita' (ISS), Rome, Italy.
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Pretargeted radioimmunotherapy of colorectal cancer metastases: models and pharmacokinetics predict influence of the physical and radiochemical properties of the radionuclide. Eur J Nucl Med Mol Imaging 2011; 38:2153-64. [PMID: 21858527 DOI: 10.1007/s00259-011-1903-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Accepted: 08/02/2011] [Indexed: 12/22/2022]
Abstract
PURPOSE We investigated influences of pretargeting variables, tumor location, and radionuclides in pretargeted radioimmunotherapy (PRIT) as well as estimated tumor absorbed doses. METHODS LS-174T human colonic carcinoma cells expressing carcinoembryonic antigen (CEA) were inoculated in nude mice. Biodistribution of a bispecific anti-CEA x anti-hapten antibody, TF2, and of a TF2-pretargeted peptide was assessed and a multi-compartment pharmacokinetic model was devised. Tissue absorbed doses were calculated for (131)I, (177)Lu, (90)Y, (211)At, and (213)Bi using realistic specific activities. RESULTS Under conditions optimized for tumor imaging (10:1 TF2 to peptide molar ratio, interval time 15-24 h), tumor uptake reached ∼9 ID/g in subcutaneous tumors at 2 h with very low accretion in normal tissues (tumor to blood ratio >20:1 after 2 h). For a low dose of peptide (0.04 nmol), (211)At is predicted to deliver a high absorbed dose to tumors [41.5 Gy considering a relative biologic effect (RBE) of 5], kidneys being dose-limiting. (90)Y and (213)Bi would also deliver high absorbed doses to tumor (18.6 for (90)Y and 26.5 Gy for (213)Bi, taking RBE into account, for 0.1 nmol) and acceptable absorbed doses to kidneys. With hepatic metastases, a twofold higher tumor absorbed dose is expected. Owing to the low activities measured in blood, the bone marrow absorbed dose is expected to be without significant toxicity. CONCLUSION Pretargeting achieves high tumor uptake and higher tumor to background ratios compared to direct RIT. Short-lived radionuclides are predicted to deliver high tumor absorbed doses especially (211)At, with kidneys being the dose-limiting organ. (177)Lu and (131)I should be considered for repeated injections.
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Adjuvant radioimmunotherapy improves survival of rats after resection of colorectal liver metastases. Ann Surg 2011; 253:336-41. [PMID: 21217519 DOI: 10.1097/sla.0b013e3181ff313a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
OBJECTIVE The aim of this study was to test the hypothesis that adjuvant radioimmunotherapy (RIT) prevents recurrent liver metastases and/or results in improved survival after tumorectomy in an experimental model. BACKGROUND Although partial hepatectomy can improve 5-year survival of patients with colorectal liver metastases up to 58%, recurrent tumor growth in the liver occurs frequently. Radioimmunotherapy using radiolabeled monoclonal antibodies directed against tumor-associated antigens is considered most suited for treating minimal residual disease and could therefore serve as an adjuvant after surgery. METHODS Liver metastases were induced in male Wag/Rij rats by a mini-laparotomy with intrahepatic injection of 0.3 × 106 CC531 tumor cells. The biodistribution of the radiolabeled monoclonal antibody MG1, directed against a 80-kDa cell surface antigen on CC531 tumors, in this model was determined at 1, 3, and 7 days after intravenous administration. The therapeutic efficacy of 177Lu-MG1 was compared with that of a sham antibody (UPC10), labeled with the same activity dose of Lu-177, and saline only. Radioimmunotherapy was administered either at the day of the tumorectomy (day 14 after tumor cell inoculation) or 7 days later. Primary endpoint was survival. RESULTS Radiolabeled MG1 preferentially accumulated in tumor lesions in the liver reaching a maximum 3 days postinjection (8.7 ± 0.6% injected dose per gram). Both the administration of 177Lu-MG1 and 177Lu-UPC10 resulted in a transient decrease in body weight. No other signs of clinical discomfort were registered. The survival curves of the group that received 177Lu-UPC10 and the group that received saline only did not differ (P=0.886). Administration of RIT immediately after surgery improved survival compared to administration of the control antibody (hazard ratio [HR], 1.54; P = 0.051), which was even more pronounced when survival was adjusted for the weight of the resected tumor (HR, 1.71; P = 0.027). A therapeutic efficacy of delayed treatment seemed likely (HR, 2.34; P = 0.055). Survival after early administration did not differ from delayed administration (HR, 1.16; P = 0.763). CONCLUSION This study provides proof of principle that RIT can be an effective adjuvant treatment modality after surgical treatment of colorectal liver metastases.
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Research Spotlight - Radioimmunotherapy: optimizing delivery to solid tumors. Ther Deliv 2011; 2:567-72. [DOI: 10.4155/tde.11.33] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Radioimmunotherapy (RIT) is a cancer treatment that exploits the specific targeting capability of monoclonal antibodies to deliver cytotoxic radionuclides to antigen-expressing tumor cells or stromal targets. While this has been extremely successful in the treatment of hematologic malignancies, RIT of solid tumors has produced less prolonged effects. In our laboratory, we have developed a bench-to-bedside translational pipeline with the aim of optimizing RIT for solid tumors. We will show how preclinical models of colorectal adenocarcinoma were initially used to study reciprocal interactions between elements of the tumor microenvironment and RIT and to test novel therapeutic strategies. These studies were then used to facilitate the design of novel trials carried out in close collaboration with our clinical colleagues.
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The intraportal injection model for liver metastasis: advantages of associated bioluminescence to assess tumor growth and influences on tumor uptake of radiolabeled anti-carcinoembryonic antigen antibody. Nucl Med Commun 2011; 32:147-54. [PMID: 21116205 DOI: 10.1097/mnm.0b013e328341b268] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Radioimmunotherapy is emerging as a new tool for adjuvant therapy of colorectal cancer. The liver remains the main site for metastases, carrying a high mortality rate. Many animal models are available but none associates easy, reliable implantation and in-vivo follow-up for experimental therapeutic studies. The aims of this study were to develop a reliable hepatic metastatic colonic cancer model in mice using the intraportal route for injection, with follow-up by bioluminescence (BLI) and to evaluate the impact of tumor location on tumor antigen direct targeting using radiolabeled anti-CEA (carcinoembryonic antigen) antibodies. METHODS Ls-174T Luc+ is a colon carcinoma cell line strongly expressing CEA, transfected with the luciferase gene for BLI. Isolated or aggregated cells (1×10(6)) were injected through the portal vein. The tumor burden was investigated using BLI to assess hepatic implantation and growth kinetics. The biodistribution of the 125I anti-CEA antibody fragment (F6) was studied in this model and was compared with subcutaneous implantation. RESULTS The tumor implantation rate was 100% using aggregated cells compared with 26.6% of isolated cells. Photons emitted by 1×10(6) cells were detected by BLI immediately after injection and allowed visual confirmation of hepatic distribution. The tumor growth was assessed over time to select homogeneous groups of animals. Radiolabeled anti-CEA antibody biodistributions showed a significantly higher uptake in hepatic than in subcutaneous tumors. CONCLUSION The association of hepatic tumor graft through the portal route and BLI provides a reliable animal model and permits sensitive in-vivo detection and follow-up of hepatic metastases. The hepatic model seems to more closely reproduce colon cancer metastases compared with subcutaneous metastasis. The hepatic model is of particular interest for studying radioimmunotherapy.
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van Oosten M, Crane LM, Bart J, van Leeuwen FW, van Dam GM. Selecting Potential Targetable Biomarkers for Imaging Purposes in Colorectal Cancer Using TArget Selection Criteria (TASC): A Novel Target Identification Tool. Transl Oncol 2011; 4:71-82. [PMID: 21461170 PMCID: PMC3069650 DOI: 10.1593/tlo.10220] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2010] [Revised: 10/23/2010] [Accepted: 11/01/2010] [Indexed: 12/19/2022] Open
Abstract
Peritoneal carcinomatosis (PC) of colorectal origin is associated with a poor prognosis. However, cytoreductive surgery combined with hyperthermic intraperitoneal chemotherapy is available for a selected group of PC patients, which significantly increases overall survival rates up to 30%. As a consequence, there is substantial room for improvement. Tumor targeting is expected to improve the treatment efficacy of colorectal cancer (CRC) further through 1) more sensitive preoperative tumor detection, thus reducing overtreatment; 2) better intraoperative detection and surgical elimination of residual disease using tumor-specific intraoperative imaging; and 3) tumor-specific targeted therapeutics. This review focuses, in particular, on the development of tumor-targeted imaging agents. A large number of biomarkers are known to be upregulated in CRC. However, to date, no validated criteria have been described for the selection of the most promising biomarkers for tumor targeting. Such a scoring system might improve the selection of the correct biomarker for imaging purposes. In this review, we present the TArget Selection Criteria (TASC) scoring system for selection of potential biomarkers for tumor-targeted imaging. By applying TASC to biomarkers for CRC, we identified seven biomarkers (carcinoembryonic antigen, CXC chemokine receptor 4, epidermal growth factor receptor, epithelial cell adhesion molecule, matrix metalloproteinases, mucin 1, and vascular endothelial growth factor A) that seem most suitable for tumor-targeted imaging applications in colorectal cancer. Further cross-validation studies in CRC and other tumor types are necessary to establish its definitive value.
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Affiliation(s)
- Marleen van Oosten
- Department of Surgery, Division of Surgical Oncology, Surgical Research Laboratory/BioOptical Imaging Center, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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Huang X, Peng X, Wang Y, Wang Y, Shin DM, El-Sayed MA, Nie S. A reexamination of active and passive tumor targeting by using rod-shaped gold nanocrystals and covalently conjugated peptide ligands. ACS NANO 2010; 4:5887-96. [PMID: 20863096 PMCID: PMC2964428 DOI: 10.1021/nn102055s] [Citation(s) in RCA: 314] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The targeted delivery of nanoparticles to solid tumors is one of the most important and challenging problems in cancer nanomedicine, but the detailed delivery mechanisms and design principles are still not well understood. Here we report quantitative tumor uptake studies for a class of elongated gold nanocrystals (called nanorods) that are covalently conjugated to tumor-targeting peptides. A major advantage in using gold as a "tracer" is that the accumulated gold in tumors and other organs can be quantitatively determined by elemental mass spectrometry (gold is not a natural element found in animals). Thus, colloidal gold nanorods are stabilized with a layer of polyethylene glycols (PEGs) and are conjugated to three different ligands: (i) a single-chain variable fragment (ScFv) peptide that recognizes the epidermal growth factor receptor (EGFR); (ii) an amino terminal fragment (ATF) peptide that recognizes the urokinase plasminogen activator receptor (uPAR); and (iii) a cyclic RGD peptide that recognizes the a(v)β(3) integrin receptor. Quantitative pharmacokinetic and biodistribution data show that these targeting ligands only marginally improve the total gold accumulation in xenograft tumor models in comparison with nontargeted controls, but their use could greatly alter the intracellular and extracellular nanoparticle distributions. When the gold nanorods are administered via intravenous injection, we also find that active molecular targeting of the tumor microenvironments (e.g., fibroblasts, macrophages, and vasculatures) does not significantly influence the tumor nanoparticle uptake. These results suggest that for photothermal cancer therapy, the preferred route of gold nanorod administration is intratumoral injection instead of intravenous injection.
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Affiliation(s)
- Xiaohua Huang
- Departments of Biomedical Engineering and Chemistry, Emory University and Georgia Institute of Technology, 101 Woodruff Circle Suite 2007, Atlanta, GA 30322, USA
- Department of Chemistry, The University of Memphis, 411 Smith Chemistry Bldg, Memphis, TN 38152, USA
| | - Xianghong Peng
- Department of Hematology and Medical Oncology and the Winship Cancer Institute, Emory University, School of Medicine, 1365 Clifton Road, Atlanta, GA 30322, USA
| | - Yiqing Wang
- Departments of Biomedical Engineering and Chemistry, Emory University and Georgia Institute of Technology, 101 Woodruff Circle Suite 2007, Atlanta, GA 30322, USA
| | - Yuxiang Wang
- Department of Hematology and Medical Oncology and the Winship Cancer Institute, Emory University, School of Medicine, 1365 Clifton Road, Atlanta, GA 30322, USA
| | - Dong M. Shin
- Department of Hematology and Medical Oncology and the Winship Cancer Institute, Emory University, School of Medicine, 1365 Clifton Road, Atlanta, GA 30322, USA
- Authors to whom correspondence should be addressed; ; ;
| | - Mostafa A. El-Sayed
- Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA
- Authors to whom correspondence should be addressed; ; ;
| | - Shuming Nie
- Departments of Biomedical Engineering and Chemistry, Emory University and Georgia Institute of Technology, 101 Woodruff Circle Suite 2007, Atlanta, GA 30322, USA
- Authors to whom correspondence should be addressed; ; ;
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Gompels LL, Lim NH, Vincent T, Paleolog EM. In vivo optical imaging in arthritis--an enlightening future? Rheumatology (Oxford) 2010; 49:1436-46. [PMID: 20338885 DOI: 10.1093/rheumatology/keq012] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In vivo molecular optical imaging has significant potential to delineate and measure, at the macroscopic level, in vivo biological processes that are occurring at the cellular and molecular level. Optical imaging has already been developed for in vitro and ex vivo applications in molecular and cellular biology (e.g. fluorescence confocal microscopy), but is still at an early stage of development as a whole-animal in vivo imaging technique. Both sensitivity and spatial resolution remain incompletely defined. Rapid advances in hardware technology and highly innovative reporter probes and dyes will be expected to deliver significant insight into perturbations of molecular pathways that occur in disease, ultimately with the potential of translating into future molecular imaging techniques for patients with arthritis. This review will focus on currently available technologies for live in vivo animal optical imaging, including fluorescence reflectance imaging, potential novel tomographic techniques, bioluminescence reporter technology and potential novel labelling techniques, highlighting in particular the potential application of in vivo fluorescence imaging in arthritis.
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Affiliation(s)
- Luke L Gompels
- Kennedy Institute of Rheumatology, Imperial College London, Faculty of Medicine, 65 Aspenlea Road, London W6 8LH, UK.
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Kosaka N, Ogawa M, Paik DS, Paik CH, Choyke PL, Kobayashi H. Semiquantitative assessment of the microdistribution of fluorescence-labeled monoclonal antibody in small peritoneal disseminations of ovarian cancer. Cancer Sci 2010; 101:820-5. [PMID: 19961490 PMCID: PMC2848296 DOI: 10.1111/j.1349-7006.2009.01423.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Uniform antibody microdistribution throughout tumor nodules is crucial for antibody-targeted therapy, because non-uniform microdistribution leads to suboptimal therapeutic effect, a commonly observed limitation of therapeutic antibodies. Herein, we evaluated the microdistribution of different doses of intraperitoneally injected fluorescence-labeled full-antibody trastuzumab (15, 50, and 150 microg) and its Fab fragment (trastuzumab-Fab: 15 and 50 microg) in a mouse model of ovarian cancer with peritoneal disseminated tumor. A semiquantitative approach (central/peripheral accumulation ratio; C/P ratio) was developed using in situ fluorescence microscopy. Furthermore, we compared the microdistribution of intact trastuzumab with a mixed injection of trastuzumab and trastuzumab-Fab or serial injections of trastuzumab using in situ multicolor fluorescence microscopy. Fluorescence images after the administration of 15 or 50 microg trastuzumab and 15 microg trastuzumab-Fab demonstrated antibody accumulation in the tumor periphery, whereas administration of 150 microg trastuzumab and 50 microg trastuzumab-Fab showed relatively uniform accumulation throughout the tumor nodule. Using serial injections (19-h interval) of trastuzumab-rhodamine green and carboxytetramethylrhodamine (TAMRA), it was observed that the latterly injected trastuzumab-TAMRA was distributed more centrally than trastuzumab-rhodamine green injected first, whereas no difference was observed in the control mixed-injection group. Moreover, the mixed injection of trastuzumab and trastuzumab-Fab showed that trastuzumab-Fab distributed more centrally than the same amount of co-injected trastuzumab. Our results suggest that the strategies of increasing dose and using Fab fragments can be used to achieve a uniform antibody distribution within peritoneal disseminated nodules after intraperitoneal injection. Furthermore, serial-injection and mixed-injection strategies can modify antibody microdistribution within tumors and have the potential for preferential delivery of anticancer drugs to either the tumor periphery or its center.
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Affiliation(s)
- Nobuyuki Kosaka
- Molecular Imaging Program, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
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Dearling JLJ, Flynn AA, Qureshi U, Whiting S, Boxer GM, Green A, Begent RHJ, Pedley RB. Localization of radiolabeled anti-CEA antibody in subcutaneous and intrahepatic colorectal xenografts: influence of tumor size and location within host organ on antibody uptake. Nucl Med Biol 2009; 36:883-94. [PMID: 19875045 DOI: 10.1016/j.nucmedbio.2009.07.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2009] [Revised: 07/02/2009] [Accepted: 07/02/2009] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Radioimmunotherapy (RIT) has been shown to be more effective against solid tumor micrometastases, possibly due to an inverse relationship between tumor size and radiolabeled antibody uptake. In this study, the accretion of radiolabeled antibody in intrahepatic micrometastases in an experimental model was investigated using quantitative digital autoradiography, enabling the analysis of antibody uptake in microscopic tumors. METHODS Mice bearing subcutaneous or intrahepatic metastatic models of LS174T colorectal cancer were injected with radiolabeled anti-carcinoembryonic antigen antibody ([(125)I]A5B7). Tissues were taken to investigate distribution of radionuclide and tumor uptake. In a therapy study, mice bearing intrahepatic metastatic tumors were injected with [(131)I]A5B7. RESULTS Subcutaneous tumors and large metastatic deposits had similar uptake (e.g., approximately 15%ID/g at 24 h). Small metastatic deposits had higher uptake (e.g., approximately 80%ID/g at 24 h) and prolonged retention at later time points. Small deposit uptake was significantly reduced by accompanying large deposits in the same liver. RIT resulted in increased survival time (untreated mean survival of 21.6+/-12.9 vs. treated mean survival of 39.1+/-30.8 days), but there was a large range of response within groups, presumably due to variation in pattern and extent of tumor as observed in the biodistribution study. Liver function tests and body weight did not change with tumor growth or therapy response, strongly supporting the use of in vivo imaging in metastatic tumor therapy studies. CONCLUSIONS Radioimmunodetection and therapy might be greatly influenced by the size and distribution of intrahepatic tumor deposits.
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Affiliation(s)
- Jason L J Dearling
- Cancer Research UK Targeting and Imaging Group, Research Department of Oncology, UCL Cancer Institute, Paul O'Gorman Building, University College London, London, UK.
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Ahlskog JKJ, Schliemann C, Mårlind J, Qureshi U, Ammar A, Pedley RB, Neri D. Human monoclonal antibodies targeting carbonic anhydrase IX for the molecular imaging of hypoxic regions in solid tumours. Br J Cancer 2009; 101:645-57. [PMID: 19623173 PMCID: PMC2736829 DOI: 10.1038/sj.bjc.6605200] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Background: Hypoxia, which is commonly observed in areas of primary tumours and of metastases, influences response to treatment. However, its characterisation has so far mainly been restricted to the ex vivo analysis of tumour sections using monoclonal antibodies specific to carbonic anhydrase IX (CA IX) or by pimonidazole staining, after the intravenous administration of this 2-nitroimidazole compound in experimental animal models. Methods: In this study, we describe the generation of high-affinity human monoclonal antibodies (A3 and CC7) specific to human CA IX, using phage technology. Results: These antibodies were able to stain CA IX ex vivo and to target the cognate antigen in vivo. In one of the two animal models of colorectal cancer studied (LS174T), CA IX imaging closely matched pimonidazole staining, with a preferential staining of tumour areas characterised by little vascularity and low perfusion. In contrast, in a second animal model (SW1222), distinct staining patterns were observed for pimonidazole and CA IX targeting. We observed a complementary pattern of tumour regions targeted in vivo by the clinical-stage vascular-targeting antibody L19 and the anti-CA IX antibody A3, indicating that a homogenous pattern of in vivo tumour targeting could be achieved by a combination of the two antibodies. Conclusion: The new human anti-CA IX antibodies are expected to be non-immunogenic in patients with cancer and may serve as broadly applicable reagents for the non-invasive imaging of hypoxia and for pharmacodelivery applications.
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Affiliation(s)
- J K J Ahlskog
- Department of Chemistry and Applied Biosciences, ETH Zürich, Wolfgang-Pauli-Strasse 10, Zurich CH-8093, Switzerland
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