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Liu C, Zhu N, Sun H, Zhang J, Feng X, Gjerswold-Selleck S, Sikka D, Zhu X, Liu X, Nuriel T, Wei HJ, Wu CC, Vaughan JT, Laine AF, Provenzano FA, Small SA, Guo J. Deep learning of MRI contrast enhancement for mapping cerebral blood volume from single-modal non-contrast scans of aging and Alzheimer's disease brains. Front Aging Neurosci 2022; 14:923673. [PMID: 36034139 PMCID: PMC9407020 DOI: 10.3389/fnagi.2022.923673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 07/18/2022] [Indexed: 11/13/2022] Open
Abstract
While MRI contrast agents such as those based on Gadolinium are needed for high-resolution mapping of brain metabolism, these contrast agents require intravenous administration, and there are rising concerns over their safety and invasiveness. Furthermore, non-contrast MRI scans are more commonly performed than those with contrast agents and are readily available for analysis in public databases such as the Alzheimer's Disease Neuroimaging Initiative (ADNI). In this article, we hypothesize that a deep learning model, trained using quantitative steady-state contrast-enhanced structural MRI datasets, in mice and humans, can generate contrast-equivalent information from a single non-contrast MRI scan. The model was first trained, optimized, and validated in mice, and was then transferred and adapted to humans. We observe that the model can substitute for Gadolinium-based contrast agents in approximating cerebral blood volume, a quantitative representation of brain activity, at sub-millimeter granularity. Furthermore, we validate the use of our deep-learned prediction maps to identify functional abnormalities in the aging brain using locally obtained MRI scans, and in the brain of patients with Alzheimer's disease using publicly available MRI scans from ADNI. Since it is derived from a commonly-acquired MRI protocol, this framework has the potential for broad clinical utility and can also be applied retrospectively to research scans across a host of neurological/functional diseases.
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Affiliation(s)
- Chen Liu
- Department of Electrical Engineering, Columbia University, New York, NY, United States
| | - Nanyan Zhu
- Department of Biological Sciences, Columbia University, New York, NY, United States
| | - Haoran Sun
- Department of Biomedical Engineering, Columbia University, New York, NY, United States
| | - Junhao Zhang
- Department of Biomedical Engineering, Columbia University, New York, NY, United States
| | - Xinyang Feng
- Department of Biomedical Engineering, Columbia University, New York, NY, United States
| | | | - Dipika Sikka
- Department of Biomedical Engineering, Columbia University, New York, NY, United States
| | - Xuemin Zhu
- Department of Pathology and Cell Biology, Columbia University, New York, NY, United States
| | - Xueqing Liu
- Department of Biomedical Engineering, Columbia University, New York, NY, United States
| | - Tal Nuriel
- Department of Radiation Oncology, Columbia University, New York, NY, United States
| | - Hong-Jian Wei
- Department of Radiation Oncology, Columbia University, New York, NY, United States
| | - Cheng-Chia Wu
- Department of Radiation Oncology, Columbia University, New York, NY, United States
| | - J. Thomas Vaughan
- Department of Biomedical Engineering, Columbia University, New York, NY, United States
| | - Andrew F. Laine
- Department of Biomedical Engineering, Columbia University, New York, NY, United States
| | | | - Scott A. Small
- Department of Neurology, Columbia University, New York, NY, United States
- Department of Psychiatry, Columbia University, New York, NY, United States
- Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University, New York, NY, United States
| | - Jia Guo
- Department of Psychiatry, Columbia University, New York, NY, United States
- The Mortimer B. Zuckerman Mind Brain Behavior Institute, Columbia University, New York, NY, United States
- *Correspondence: Jia Guo
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Arias-Ramos N, Ibarra LE, Serrano-Torres M, Yagüe B, Caverzán MD, Chesta CA, Palacios RE, López-Larrubia P. Iron Oxide Incorporated Conjugated Polymer Nanoparticles for Simultaneous Use in Magnetic Resonance and Fluorescent Imaging of Brain Tumors. Pharmaceutics 2021; 13:1258. [PMID: 34452219 PMCID: PMC8400017 DOI: 10.3390/pharmaceutics13081258] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/03/2021] [Accepted: 08/09/2021] [Indexed: 12/13/2022] Open
Abstract
Conjugated polymer nanoparticles (CPNs) have emerged as advanced polymeric nanoplatforms in biomedical applications by virtue of extraordinary properties including high fluorescence brightness, large absorption coefficients of one and two-photons, and excellent photostability and colloidal stability in water and physiological medium. In addition, low cytotoxicity, easy functionalization, and the ability to modify CPN photochemical properties by the incorporation of dopants, convert them into excellent theranostic agents with multifunctionality for imaging and treatment. In this work, CPNs were designed and synthesized by incorporating a metal oxide magnetic core (Fe3O4 and NiFe2O4 nanoparticles, 5 nm) into their matrix during the nanoprecipitation method. This modification allowed the in vivo monitoring of nanoparticles in animal models using magnetic resonance imaging (MRI) and intravital fluorescence, techniques widely used for intracranial tumors evaluation. The modified CPNs were assessed in vivo in glioblastoma (GBM) bearing mice, both heterotopic and orthotopic developed models. Biodistribution studies were performed with MRI acquisitions and fluorescence images up to 24 h after the i.v. nanoparticles administration. The resulting IONP-doped CPNs were biocompatible in GBM tumor cells in vitro with an excellent cell incorporation depending on nanoparticle concentration exposure. IONP-doped CPNs were detected in tumor and excretory organs of the heterotopic GBM model after i.v. and i.t. injection. However, in the orthotopic GBM model, the size of the nanoparticles is probably hindering a higher effect on intratumorally T2-weighted images (T2WI) signals and T2 values. The photodynamic therapy (PDT)-cytotoxicity of CPNs was not either affected by the IONPs incorporation into the nanoparticles.
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Affiliation(s)
- Nuria Arias-Ramos
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid (CSIC-UAM), 28029 Madrid, Spain; (N.A.-R.); (M.S.-T.); (B.Y.)
| | - Luis Exequiel Ibarra
- Instituto de Biotecnología Ambiental y Salud (INBIAS), Universidad Nacional de Río Cuarto (UNRC) y CONICET, Córdoba X5800BIA, Argentina
- Departamento de Biología Molecular, Facultad de Ciencias Exactas, Fisicoquímicas y Naturales, Universidad Nacional de Río Cuarto (UNRC), Córdoba X5800BIA, Argentina; (M.D.C.)
| | - María Serrano-Torres
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid (CSIC-UAM), 28029 Madrid, Spain; (N.A.-R.); (M.S.-T.); (B.Y.)
| | - Balbino Yagüe
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid (CSIC-UAM), 28029 Madrid, Spain; (N.A.-R.); (M.S.-T.); (B.Y.)
| | - Matías Daniel Caverzán
- Departamento de Biología Molecular, Facultad de Ciencias Exactas, Fisicoquímicas y Naturales, Universidad Nacional de Río Cuarto (UNRC), Córdoba X5800BIA, Argentina; (M.D.C.)
- Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados (IITEMA), Universidad Nacional de Río Cuarto y CONICET, Córdoba X5800BIA, Argentina; (C.A.C.); (R.E.P.)
| | - Carlos Alberto Chesta
- Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados (IITEMA), Universidad Nacional de Río Cuarto y CONICET, Córdoba X5800BIA, Argentina; (C.A.C.); (R.E.P.)
- Departamento de Química, Facultad de Ciencias Exactas, Fisicoquímicas y Naturales, UNRC, Córdoba X5800BIA, Argentina
| | - Rodrigo Emiliano Palacios
- Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados (IITEMA), Universidad Nacional de Río Cuarto y CONICET, Córdoba X5800BIA, Argentina; (C.A.C.); (R.E.P.)
- Departamento de Química, Facultad de Ciencias Exactas, Fisicoquímicas y Naturales, UNRC, Córdoba X5800BIA, Argentina
| | - Pilar López-Larrubia
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid (CSIC-UAM), 28029 Madrid, Spain; (N.A.-R.); (M.S.-T.); (B.Y.)
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Ibarra LE, Beaugé L, Arias-Ramos N, Rivarola VA, Chesta CA, López-Larrubia P, Palacios RE. Trojan horse monocyte-mediated delivery of conjugated polymer nanoparticles for improved photodynamic therapy of glioblastoma. Nanomedicine (Lond) 2020; 15:1687-1707. [DOI: 10.2217/nnm-2020-0106] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Aim: To assess monocyte-based delivery of conjugated polymer nanoparticles (CPNs) for improved photodynamic therapy (PDT) in glioblastoma (GBM). Materials & methods: Human monocyte cells (THP-1) and murine monocytes isolated from bone marrow (mBMDMs) were employed as stealth CPN carriers to penetrate into GBM spheroids and an orthotopic model of the tumor. The success of PDT, using this cell-mediated targeting strategy, was determined by its effect on the spheroids. Results: CPNs did not affect monocyte viability in the absence of light and did not show nonspecific release after cell loading. Activated monocytes incorporated CPNs in a higher proportion than monocytes in their naive state, without a loss of cellular functionality. In vitro PDT efficacy using cell-mediated delivery was superior to that using non vehiculized CPNs. Conclusion: CPN-loaded monocytes could efficiently deliver CPNs into GBM spheroids and the orthotopic model. Improved PDT in spheroids was confirmed using this delivery strategy.
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Affiliation(s)
- Luis E Ibarra
- Instituto de Biotecnología Ambiental y Salud (INBIAS), Universidad Nacional de Río Cuarto (UNRC) y Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Río Cuarto, 5800, Córdoba, Argentina
- Departamento de Biología Molecular, Facultad de Ciencias Exactas Fisicoquímicas y Naturales, UNRC, Río Cuarto, 5800, Córdoba, Argentina
| | - Lucía Beaugé
- Departamento de Biología Molecular, Facultad de Ciencias Exactas Fisicoquímicas y Naturales, UNRC, Río Cuarto, 5800, Córdoba, Argentina
| | - Nuria Arias-Ramos
- Instituto de Investigaciones Biomédicas “Alberto Sols”, CSIC/UAM, Madrid, 28029, España
| | - Viviana A Rivarola
- Instituto de Biotecnología Ambiental y Salud (INBIAS), Universidad Nacional de Río Cuarto (UNRC) y Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Río Cuarto, 5800, Córdoba, Argentina
- Departamento de Biología Molecular, Facultad de Ciencias Exactas Fisicoquímicas y Naturales, UNRC, Río Cuarto, 5800, Córdoba, Argentina
| | - Carlos A Chesta
- Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados (IITEMA), Universidad Nacional de Río Cuarto (UNRC) y CONICET, Río Cuarto, 5800, Córdoba, Argentina
- Departamento de Química, Facultad de Ciencias Exactas Fisicoquímicas y Naturales, UNRC, Río Cuarto, 5800, Córdoba, Argentina
| | - Pilar López-Larrubia
- Instituto de Investigaciones Biomédicas “Alberto Sols”, CSIC/UAM, Madrid, 28029, España
| | - Rodrigo E Palacios
- Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados (IITEMA), Universidad Nacional de Río Cuarto (UNRC) y CONICET, Río Cuarto, 5800, Córdoba, Argentina
- Departamento de Química, Facultad de Ciencias Exactas Fisicoquímicas y Naturales, UNRC, Río Cuarto, 5800, Córdoba, Argentina
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Dynamic Susceptibility Contrast MRI in Small Animals. Methods Mol Biol 2018. [PMID: 29341001 DOI: 10.1007/978-1-4939-7531-0_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023]
Abstract
The use of magnetic resonance imaging (MRI) for studying the cerebral perfusion mechanisms is well proved and contrasted in the clinical and research setups. This methodology is a promising tool in assessing numerous brain diseases like intracranial tumors, neurodegeneration processes, mental disorders, injuries and so on. In the preclinical environment, perfusion MRI offers a powerful resource for characterizing pathological models and specially identifying biomarkers to monitor the illness and validate the efficacy of therapeutical approaches. This chapter presents the theoretical bases and experimental protocols of dynamic susceptibility contrast MRI acquisitions for developing perfusion MRI studies in small animals.
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Ciezka M, Acosta M, Herranz C, Canals JM, Pumarola M, Candiota AP, Arús C. Development of a transplantable glioma tumour model from genetically engineered mice: MRI/MRS/MRSI characterisation. J Neurooncol 2016; 129:67-76. [PMID: 27324642 DOI: 10.1007/s11060-016-2164-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 06/01/2016] [Indexed: 11/25/2022]
Abstract
The initial aim of this study was to generate a transplantable glial tumour model of low-intermediate grade by disaggregation of a spontaneous tumour mass from genetically engineered models (GEM). This should result in an increased tumour incidence in comparison to GEM animals. An anaplastic oligoastrocytoma (OA) tumour of World Health Organization (WHO) grade III was obtained from a female GEM mouse with the S100β-v-erbB/inK4a-Arf (+/-) genotype maintained in the C57BL/6 background. The tumour tissue was disaggregated; tumour cells from it were grown in aggregates and stereotactically injected into C57BL/6 mice. Tumour development was followed using Magnetic Resonance Imaging (MRI), while changes in the metabolomics pattern of the masses were evaluated by Magnetic Resonance Spectroscopy/Spectroscopic Imaging (MRS/MRSI). Final tumour grade was evaluated by histopathological analysis. The total number of tumours generated from GEM cells from disaggregated tumour (CDT) was 67 with up to 100 % penetrance, as compared to 16 % in the local GEM model, with an average survival time of 66 ± 55 days, up to 4.3-fold significantly higher than the standard GL261 glioblastoma (GBM) tumour model. Tumours produced by transplantation of cells freshly obtained from disaggregated GEM tumour were diagnosed as WHO grade III anaplastic oligodendroglioma (ODG) and OA, while tumours produced from a previously frozen sample were diagnosed as WHO grade IV GBM. We successfully grew CDT and generated tumours from a grade III GEM glial tumour. Freezing and cell culture protocols produced progression to grade IV GBM, which makes the developed transplantable model qualify as potential secondary GBM model in mice.
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Affiliation(s)
- Magdalena Ciezka
- Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica de Biociències, Edifici Cs, Universitat Autònoma de Barcelona, 08193, Cerdanyola del Vallès, Spain
- Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Cerdanyola del Vallès, Spain
| | - Milena Acosta
- Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica de Biociències, Edifici Cs, Universitat Autònoma de Barcelona, 08193, Cerdanyola del Vallès, Spain
- Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Cerdanyola del Vallès, Spain
| | - Cristina Herranz
- Laboratory of Stem Cells and Regenerative Medicine, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- Research and Development Unit, Cell Therapy Program, Faculty of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- Institut d'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
| | - Josep M Canals
- Laboratory of Stem Cells and Regenerative Medicine, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- Research and Development Unit, Cell Therapy Program, Faculty of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- Institut d'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
| | - Martí Pumarola
- Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Cerdanyola del Vallès, Spain
- Departament de Medicina i Cirurgia Animals, Facultat de Veterinària, Edifici V, Universitat Autònoma de Barcelona, 08193, Cerdanyola del Vallès, Spain
| | - Ana Paula Candiota
- Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica de Biociències, Edifici Cs, Universitat Autònoma de Barcelona, 08193, Cerdanyola del Vallès, Spain.
- Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Cerdanyola del Vallès, Spain.
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193, Cerdanyola del Vallès, Spain.
| | - Carles Arús
- Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica de Biociències, Edifici Cs, Universitat Autònoma de Barcelona, 08193, Cerdanyola del Vallès, Spain
- Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Cerdanyola del Vallès, Spain
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193, Cerdanyola del Vallès, Spain
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Thews O, Vaupel P. Spatial oxygenation profiles in tumors during normo- and hyperbaric hyperoxia. Strahlenther Onkol 2015; 191:875-82. [PMID: 26135917 DOI: 10.1007/s00066-015-0867-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Accepted: 06/06/2015] [Indexed: 11/24/2022]
Abstract
BACKGROUND Inspiratory hyperoxia reduces tumor hypoxia, which is responsible for limited radiosensitivity of tumors. However, very little is known about the heterogeneity of intratumoral oxygenation during this supportive treatment. The study analyzes whether local hypoxia is still present during normobaric and hyperbaric inspiratory hyperoxia and whether the addition of CO2 to the inspiratory gas affects the spatial pO2 distribution. MATERIAL AND METHODS Tumor oxygenation of experimental DS-sarcomas in rats was assessed by polarographic needle electrodes at 1 and 2 atm (bar) environmental pressure during pure O2 or carbogen (95 % O2 + 5 % CO2) breathing. Up to 320 individual pO2 measurements were performed in a strictly oriented grid resulting in an oxygenation profile in a horizontal tumor layer. RESULTS In the experimental tumors used the oxygenation showed pronounced heterogeneities with closely adjacent hypoxic and oxygenated regions. This heterogeneity was still visible under normobaric hyperoxia where large confluent hypoxic regions were detectable. At 1 atm, the addition of CO2 improved tumor oxygenation significantly (at least in large tumors). At 2 atm, only very small local regions of hypoxia were detected. However, under this condition hypercapnia had no impact on tumor oxygenation. CONCLUSIONS The data show that even under hyperbaric hyperoxia, hypoxic regions are detectable despite the average pO2 increased by a factor of 100. The results also clearly indicate that the oxygenation pattern improves disproportionally with increasing environmental pressure.
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Affiliation(s)
- Oliver Thews
- Institute of Physiology, University of Halle, Magdeburger Str. 6, 06112, Halle (Saale), Germany.
| | - Peter Vaupel
- Department of Radiooncology and Radiotherapy, Tumor Pathophysiology Section, University Medical Center, 55131, Mainz, Germany
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Process of the Functional Reorganization of the Cortical Centers for Movement in GBM Patients: fMRI Study. Clin Neuroradiol 2015; 27:71-79. [PMID: 25986127 PMCID: PMC8076113 DOI: 10.1007/s00062-015-0398-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Accepted: 04/13/2015] [Indexed: 01/17/2023]
Abstract
Purpose The aim of this study was to verify whether the functional reorganization of motor cortex is associated with the increase in the size of WHO type IV glioma lesion, that is, disease duration and development, and whether surgical treatment has an impact on cerebral plasticity. Methods The study included 16 patients with primary tumors of the brain located at the region of central sulcus. The clinical status of patients and tumor volume was determined. Functional magnetic resonance imaging examinations were performed before and 3 months after operation. Results The activity of all cortical centers, both contralateral and ipsilateral, was observed in a group of small as well as large tumors. The intensity of activation and the number of activated clusters of small tumors were almost always higher as compared with the large tumors. The frequency of the activity of contralateral areas was similar during the first and the second examination. In the case of ipsilateral centers, the frequency of activation during the second examination was lower. Mean values of t-statistics during the first examination were higher than during the second examination. Supplementary motor area (SMAa) was the only center for which the mean values of activation intensity remained similar. Conclusions SMAa seems to play the most important role in the processes of motor cortex plasticity in high-grade glioma patients. Surgery seems not having a significant influence on the pattern of functional reorganization of the cortical centers for movement. Identification of the individual patterns of the reorganization of motor centers plays an important role in clinical practice.
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Ocak M, Gillman AG, Bresee J, Zhang L, Vlad AM, Müller C, Schibli R, Edwards WB, Anderson CJ, Gach HM. Folate receptor-targeted multimodality imaging of ovarian cancer in a novel syngeneic mouse model. Mol Pharm 2015; 12:542-53. [PMID: 25536192 PMCID: PMC4319688 DOI: 10.1021/mp500628g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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A new
transplantable ovarian tumor model is presented using a novel
folate receptor (FR) positive, murine ovarian cancer cell line that
emulates the human disease and induces widespread intraperitoneal
(i.p.) tumors in immunocompetent mice within 4–8 weeks of implantation.
Tumor development was monitored using a new positron emission tomography
(PET) FR-targeting reporter with PET/computerized tomography (PET/CT)
and fluorescence molecular tomography (FMT) using a commercial FR-targeting
reporter. Conventional structural magnetic resonance imaging (MRI)
was also performed. Adult female C57BL/6 mice were injected i.p. with
6 × 106 MKP-L FR+ cells. Imaging was performed weekly
beginning 2 weeks after tumor induction. The albumin-binding, FR-targeting
ligand cm09 was radiolabeled with the positron emitter 68Ga and used to image the tumors with a small animal PET/CT. The FR-reporter
FolateRSense 680 (PerkinElmer) was used for FMT and flow cytometry.
Preclinical MRI (7 T) without FR-targeting was compared with the PET
and FMT molecular imaging. Tumors were visible by all three imaging
modalities. PET/CT had the highest imaging sensitivity at 3–3.5
h postadministration (mean %IA/g mean > 6) and visualized tumors
earlier
than the other two modalities with lower kidney uptake (mean %IA/g
mean < 17) than previously reported FR-targeting agents in late
stage disease. FMT showed relatively low FR-targeted agent in the
bladder and kidneys, but yielded the lowest anatomical image resolution.
MRI produced the highest resolution images, but it was difficult to
distinguish tumors from abdominal organs during early progression
since a FR-targeting MRI reporter was not used. Nevertheless, there
was good correlation of imaging biomarkers between the three modalities.
Tumors in the mouse ovarian cancer model could be detected using FR-targeted
imaging as early as 2 weeks post i.p. injection of tumor cells. An
imaging protocol should combine one or more of the modalities, e.g.,
PET/CT or PET/MRI for optimal tumor detection and delineation from
surrounding tissues.
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Affiliation(s)
- Meltem Ocak
- Department of Radiology, ‡Cancer Institute, §Department of Obstetrics, Gynecology & Reproductive Sciences, ∥Magee Womens Research Institute, ⊥Department of Pharmacology & Chemical Biology, #Department of Bioengineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15213, United States
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Pérez-Carro R, Cauli O, López-Larrubia P. Multiparametric magnetic resonance in the assessment of the gender differences in a high-grade glioma rat model. EJNMMI Res 2014; 4:44. [PMID: 26116110 PMCID: PMC4452640 DOI: 10.1186/s13550-014-0044-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 07/22/2014] [Indexed: 01/05/2023] Open
Abstract
Background Glioblastoma, the most frequent and aggressive of all astrocytomas, presents a clear predominance in male humans, but the assessment of sexual differences in its tumourigenesis and growth has received little attention so far. In this study, we aim to identify gender-dependent surrogate markers in an animal model of this cancer by means of magnetic resonance (MR) imaging and biochemical and behavioural studies. Methods A high-grade glioma model developed in male and female rats was used. Multiparametric magnetic resonance images and localized spectra were acquired. The MR parameters linked to tumoural features were quantified. Motor and metabolic activity was also assessed. Postmortem analyses were carried out to measure indicators of malignancy, tumoural metabolism and viability of the blood-brain barrier (BBB). Results Statistically significant differences dependent on the animal sex were found in the study of pathological indicators like oedema, inflammation, cellularity and microvasculature. Results suggest higher cell proliferative rate, inflammation and vasogenic oedema and or necrosis in glioma-bearing male rats. Haemodynamic parameters measured indicated a major disruption of the BBB, postmortem confirmed, in this sex. Metabolomic and energetic metabolism activity data are in agreement with a major malignancy and aggressiveness of this cancer model on males. Conclusions Gender differences should be taken into account in preclinical studies of glioblastoma models, in the characterization of the tumoural behaviour and consequently in the development and validation of new therapeutic approaches. MR imaging and spectroscopy allow to non-invasively monitor this sexual dimorphism in the diagnosis and prognosis of brain cancer.
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Affiliation(s)
- Rocío Pérez-Carro
- Laboratory of Magnetic Resonance in the Study of the Central Nervous System, Instituto de Investigaciones Biomédicas 'Alberto Sols', CSIC-UAM, Arturo Duperier 4, 28029, Madrid, Spain,
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Effect of acute hyperglycemia on moderately hypothermic GL261 mouse glioma monitored by T1-weighted DCE MRI. MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE 2014; 28:119-26. [PMID: 24916487 DOI: 10.1007/s10334-014-0447-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 04/15/2014] [Accepted: 04/15/2014] [Indexed: 10/25/2022]
Abstract
OBJECTIVE We sought to evaluate the effects of acute hyperglycemia induced by intraperitoneal injection of glucose (2.7 g/kg) on vascular delivery to GL261 mouse gliomas kept at moderate hypothermia (~30 °C). MATERIALS AND METHODS Seven GL261 glioma-bearing mice were studied by T1-weighted DCE MRI before and after an injection of glucose (n = 4) or saline (n = 3). Maximum relative contrast enhancement (RCE) and initial area under the enhancement curve (IAUC) were determined in each pixel. RESULTS The mean tumor parameter values showed no significant changes after injecting either saline (RCE -5.9 ± 5.0 %; IAUC -3.7 ± 3.6 %) or glucose (RCE -1.6 ± 9.0 %; IAUC +0.6 ± 6.4 %). Pixel-by-pixel analysis revealed small post-injection changes in RCE and IAUC between the glucose and saline groups, all within 13 % range of their baseline values. CONCLUSION Perturbing the metabolism of GL261 tumors kept at moderate hypothermia with hyperglycemia did not induce significant changes in the permeability/perfusion of these tumors. This is relevant for future studies with this model since regional differences in glucose accumulation could thus reflect basal heterogeneities in vasculature and/or metabolism of GL261 tumors.
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