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Zhang Z, Wang Y, Amarouchene Y, Boisgard R, Kellay H, Würger A, Maali A. Near-Field Probe of Thermal Fluctuations of a Hemispherical Bubble Surface. Phys Rev Lett 2021; 126:174503. [PMID: 33988395 DOI: 10.1103/physrevlett.126.174503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 03/30/2021] [Indexed: 06/12/2023]
Abstract
We report measurements of resonant thermal capillary oscillations of a hemispherical liquid gas interface obtained using a half bubble deposited on a solid substrate. The thermal motion of the hemispherical interface is investigated using an atomic force microscope cantilever that probes the amplitude of vibrations of this interface versus frequency. The spectrum of such nanoscale thermal oscillations of the bubble surface presents several resonance peaks and reveals that the contact line of the hemispherical bubble is pinned on the substrate. The analysis of these peaks allows us to measure the surface viscosity of the bubble interface. Minute amounts of impurities are responsible for altering the rheology of the pure water surface.
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Affiliation(s)
- Z Zhang
- Université de Bordeaux & CNRS, LOMA (UMR 5798), 33405 Talence, France
| | - Y Wang
- School of Mechanical Engineering and Automation, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, China
| | - Y Amarouchene
- Université de Bordeaux & CNRS, LOMA (UMR 5798), 33405 Talence, France
| | - R Boisgard
- Université de Bordeaux & CNRS, LOMA (UMR 5798), 33405 Talence, France
| | - H Kellay
- Université de Bordeaux & CNRS, LOMA (UMR 5798), 33405 Talence, France
| | - A Würger
- Université de Bordeaux & CNRS, LOMA (UMR 5798), 33405 Talence, France
| | - A Maali
- Université de Bordeaux & CNRS, LOMA (UMR 5798), 33405 Talence, France
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Auvity S, Goutal S, Thézé B, Chaves C, Hosten B, Kuhnast B, Saba W, Boisgard R, Buvat I, Cisternino S, Tournier N. Corrigendum to "Evaluation of TSPO PET imaging, a marker of glial activation, to study the neuroimmune footprints of morphine exposure and withdrawal" [Drug Alcohol Depend. 170 (2017) 43-50]. Drug Alcohol Depend 2019; 201:266-268. [PMID: 31176599 DOI: 10.1016/j.drugalcdep.2019.05.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Sylvain Auvity
- Variabilité de la réponse aux psychotropes, INSERM U1144, Paris, F-75006, France; Université Paris Descartes, UMR-S 1144, Paris, F-75006, France; Université Paris Diderot, UMR-S 1144, Paris, F-75013, France; Imagerie Moléculaire In Vivo, IMIV, CEA, Inserm, CNRS, Univ. Paris-Sud, Université Paris Saclay, CEA-SHFJ, Orsay, F-91401, France
| | - Sébastien Goutal
- Imagerie Moléculaire In Vivo, IMIV, CEA, Inserm, CNRS, Univ. Paris-Sud, Université Paris Saclay, CEA-SHFJ, Orsay, F-91401, France
| | - Benoît Thézé
- Imagerie Moléculaire In Vivo, IMIV, CEA, Inserm, CNRS, Univ. Paris-Sud, Université Paris Saclay, CEA-SHFJ, Orsay, F-91401, France
| | - Catarina Chaves
- Variabilité de la réponse aux psychotropes, INSERM U1144, Paris, F-75006, France; Université Paris Descartes, UMR-S 1144, Paris, F-75006, France; Université Paris Diderot, UMR-S 1144, Paris, F-75013, France; REQUIMTE, Laboratório de Toxicologia, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Benoît Hosten
- Variabilité de la réponse aux psychotropes, INSERM U1144, Paris, F-75006, France; Université Paris Descartes, UMR-S 1144, Paris, F-75006, France; Université Paris Diderot, UMR-S 1144, Paris, F-75013, France; Assistance publique hôpitaux de Paris, AP-HP, F-75004, France
| | - Bertrand Kuhnast
- Imagerie Moléculaire In Vivo, IMIV, CEA, Inserm, CNRS, Univ. Paris-Sud, Université Paris Saclay, CEA-SHFJ, Orsay, F-91401, France
| | - Wadad Saba
- Imagerie Moléculaire In Vivo, IMIV, CEA, Inserm, CNRS, Univ. Paris-Sud, Université Paris Saclay, CEA-SHFJ, Orsay, F-91401, France
| | - Raphaël Boisgard
- Imagerie Moléculaire In Vivo, IMIV, CEA, Inserm, CNRS, Univ. Paris-Sud, Université Paris Saclay, CEA-SHFJ, Orsay, F-91401, France
| | - Irène Buvat
- Imagerie Moléculaire In Vivo, IMIV, CEA, Inserm, CNRS, Univ. Paris-Sud, Université Paris Saclay, CEA-SHFJ, Orsay, F-91401, France
| | - Salvatore Cisternino
- Variabilité de la réponse aux psychotropes, INSERM U1144, Paris, F-75006, France; Université Paris Descartes, UMR-S 1144, Paris, F-75006, France; Université Paris Diderot, UMR-S 1144, Paris, F-75013, France; Assistance publique hôpitaux de Paris, AP-HP, F-75004, France
| | - Nicolas Tournier
- Imagerie Moléculaire In Vivo, IMIV, CEA, Inserm, CNRS, Univ. Paris-Sud, Université Paris Saclay, CEA-SHFJ, Orsay, F-91401, France.
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Nguyen DL, Wimberley C, Truillet C, Jego B, Caillé F, Pottier G, Boisgard R, Buvat I, Bouilleret V. Longitudinal positron emission tomography imaging of glial cell activation in a mouse model of mesial temporal lobe epilepsy: Toward identification of optimal treatment windows. Epilepsia 2018; 59:1234-1244. [PMID: 29672844 DOI: 10.1111/epi.14083] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/23/2018] [Indexed: 12/20/2022]
Abstract
OBJECTIVE Mesiotemporal lobe epilepsy is the most common type of drug-resistant partial epilepsy, with a specific history that often begins with status epilepticus due to various neurological insults followed by a silent period. During this period, before the first seizure occurs, a specific lesion develops, described as unilateral hippocampal sclerosis (HS). It is still challenging to determine which drugs, administered at which time point, will be most effective during the formation of this epileptic process. Neuroinflammation plays an important role in pathophysiological mechanisms in epilepsy, and therefore brain inflammation biomarkers such as translocator protein 18 kDa (TSPO) can be potent epilepsy biomarkers. TSPO is associated with reactive astrocytes and microglia. A unilateral intrahippocampal kainate injection mouse model can reproduce the defining features of human temporal lobe epilepsy with unilateral HS and the pattern of chronic pharmacoresistant temporal seizures. We hypothesized that longitudinal imaging using TSPO positron emission tomography (PET) with 18 F-DPA-714 could identify optimal treatment windows in a mouse model during the formation of HS. METHODS The model was induced into the right dorsal hippocampus of male C57/Bl6 mice. Micro-PET/computed tomographic scanning was performed before model induction and along the development of the HS at 7 days, 14 days, 1 month, and 6 months. In vitro autoradiography and immunohistofluorescence were performed on additional mice at each time point. RESULTS TSPO PET uptake reached peak at 7 days and mostly related to microglial activation, whereas after 14 days, reactive astrocytes were shown to be the main cells expressing TSPO, reflected by a continuing increased PET uptake. SIGNIFICANCE TSPO-targeted PET is a highly potent longitudinal biomarker of epilepsy and could be of interest to determine the therapeutic windows in epilepsy and to monitor response to treatment.
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Affiliation(s)
- Duc-Loc Nguyen
- In Vivo Molecular Imaging Laboratory (IMIV), French National Institute of Health and Medical Research (INSERM), French Alternative Energies and Atomic Energy Commission (CEA), French National Center for Scientific Research (CNRS), Paris Saclay University, Frédéric Joliot Hospital service, Orsay, France
| | - Catriona Wimberley
- In Vivo Molecular Imaging Laboratory (IMIV), French National Institute of Health and Medical Research (INSERM), French Alternative Energies and Atomic Energy Commission (CEA), French National Center for Scientific Research (CNRS), Paris Saclay University, Frédéric Joliot Hospital service, Orsay, France
| | - Charles Truillet
- In Vivo Molecular Imaging Laboratory (IMIV), French National Institute of Health and Medical Research (INSERM), French Alternative Energies and Atomic Energy Commission (CEA), French National Center for Scientific Research (CNRS), Paris Saclay University, Frédéric Joliot Hospital service, Orsay, France
| | - Benoit Jego
- In Vivo Molecular Imaging Laboratory (IMIV), French National Institute of Health and Medical Research (INSERM), French Alternative Energies and Atomic Energy Commission (CEA), French National Center for Scientific Research (CNRS), Paris Saclay University, Frédéric Joliot Hospital service, Orsay, France
| | - Fabien Caillé
- In Vivo Molecular Imaging Laboratory (IMIV), French National Institute of Health and Medical Research (INSERM), French Alternative Energies and Atomic Energy Commission (CEA), French National Center for Scientific Research (CNRS), Paris Saclay University, Frédéric Joliot Hospital service, Orsay, France
| | - Géraldine Pottier
- In Vivo Molecular Imaging Laboratory (IMIV), French National Institute of Health and Medical Research (INSERM), French Alternative Energies and Atomic Energy Commission (CEA), French National Center for Scientific Research (CNRS), Paris Saclay University, Frédéric Joliot Hospital service, Orsay, France
| | - Raphaël Boisgard
- In Vivo Molecular Imaging Laboratory (IMIV), French National Institute of Health and Medical Research (INSERM), French Alternative Energies and Atomic Energy Commission (CEA), French National Center for Scientific Research (CNRS), Paris Saclay University, Frédéric Joliot Hospital service, Orsay, France
| | - Irène Buvat
- In Vivo Molecular Imaging Laboratory (IMIV), French National Institute of Health and Medical Research (INSERM), French Alternative Energies and Atomic Energy Commission (CEA), French National Center for Scientific Research (CNRS), Paris Saclay University, Frédéric Joliot Hospital service, Orsay, France
| | - Viviane Bouilleret
- In Vivo Molecular Imaging Laboratory (IMIV), French National Institute of Health and Medical Research (INSERM), French Alternative Energies and Atomic Energy Commission (CEA), French National Center for Scientific Research (CNRS), Paris Saclay University, Frédéric Joliot Hospital service, Orsay, France.,Neurophysiology and Epilepsy Unit, Bicêtre Hospital, Public Hospitals of Paris (AP-HP), France
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Alberini JL, Boisgard R, Guillermet S, Siquier K, Jego B, Thézé B, Urien S, Rezaï K, Menet E, Maroy R, Dollé F, Kühnast B, Tavitian B. Multimodal In Vivo Imaging of Tumorigenesis and Response to Chemotherapy in a Transgenic Mouse Model of Mammary Cancer. Mol Imaging Biol 2017; 18:617-26. [PMID: 26630973 PMCID: PMC4927598 DOI: 10.1007/s11307-015-0916-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Purpose Transgenic mice expressing the polyoma middle T oncoprotein (PyMT) in the mammary epithelium were explored by multimodal imaging to monitor longitudinally spontaneous tumor growth and response to chemotherapy. Procedures Positron emission tomography (PET) with 2-deoxy-2-[18F]fluoro-d-glucose ([18F]FDG) and 3'-deoxy-3'-[18F]fluorothymidine ([18F]FLT), single photon emission tomography (SPECT) with [99mTc]TcO4 ([99mTc]TEC), X-ray computed tomography, and fluorescent confocal endomicroscopy (FCE) images were acquired during tumor progression in female PyMT mice. Imaging with [18F]FDG and [99mTc]TEC was also performed in untreated, doxorubicin-treated, and docetaxel-treated PyMT mice. Total tumor volumes were quantified. Tumors were collected and macroscopic and histological examinations were performed. Results All PyMT mice developed multifocal tumors of the mammary epithelium that became palpable at 8 weeks of age (W8). Computed tomography (CT) detected tumors at W14, while a clear tumoral uptake of [99mTc]TEC and [18F]FDG was present as early as W6 and W8, respectively. No contrast between mammary tumors and surrounding tissue was observed at any stage with [18F]FLT. FCE detected an angiogenic switch at W10. Lung metastases were not clearly evidenced by imaging. Doxorubicin and docetaxel treatments delayed tumor growth, as shown by [18F]FDG and [99mTc]TEC, but tumor growth resumed upon treatment discontinuation. Tumor growth fitted an exponential model with time constant rates of 0.315, 0.145, and 0.212 week−1 in untreated, doxorubicin, and docetaxel groups, respectively. Conclusions Molecular imaging of mammary tumors in PyMT is precocious, precise, and predictive. [18F]FDG-PET and [99mTc]TEC SPECT monitor tumor response to chemotherapy. Electronic supplementary material The online version of this article (doi:10.1007/s11307-015-0916-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jean-Louis Alberini
- CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Laboratoire d'Imagerie Moléculaire Expérimentale, Orsay, France.,Service de Médecine nucléaire, Institut Curie, Hôpital René Huguenin, Saint-Cloud, France.,Faculté de Médecine, Université Versailles Saint-Quentin, Versailles, France
| | - Raphaël Boisgard
- CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Laboratoire d'Imagerie Moléculaire Expérimentale, Orsay, France
| | - Stéphanie Guillermet
- CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Laboratoire d'Imagerie Moléculaire Expérimentale, Orsay, France
| | - Karine Siquier
- CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Laboratoire d'Imagerie Moléculaire Expérimentale, Orsay, France
| | - Benoît Jego
- CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Laboratoire d'Imagerie Moléculaire Expérimentale, Orsay, France
| | - Benoît Thézé
- CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Laboratoire d'Imagerie Moléculaire Expérimentale, Orsay, France
| | - Saik Urien
- Service de pharmacologie, Institut Curie, Hôpital René Huguenin, Saint-Cloud, France
| | - Keyvan Rezaï
- Service de pharmacologie, Institut Curie, Hôpital René Huguenin, Saint-Cloud, France
| | - Emmanuelle Menet
- Service de pathologie, Institut Curie, Hôpital René Huguenin, Saint-Cloud, France
| | - Renaud Maroy
- CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Laboratoire d'Imagerie Moléculaire Expérimentale, Orsay, France
| | - Frédéric Dollé
- CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Laboratoire d'Imagerie Moléculaire Expérimentale, Orsay, France
| | - Bertrand Kühnast
- CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Laboratoire d'Imagerie Moléculaire Expérimentale, Orsay, France
| | - Bertrand Tavitian
- Université Paris Descartes Sorbonne Paris Cité, Assistance Publique-Hôpitaux de Paris, Hôpital Européen Georges Pompidou, Radiology Department, Paris, France. .,Université Paris Descartes Sorbonne Paris Cité, INSERM UMR 970, Cardiovascular Research Center - PARCC, 56 rue Leblanc, 75015, Paris, France.
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Pottier G, Gómez-Vallejo V, Padro D, Boisgard R, Dollé F, Llop J, Winkeler A, Martín A. PET imaging of cannabinoid type 2 receptors with [ 11C]A-836339 did not evidence changes following neuroinflammation in rats. J Cereb Blood Flow Metab 2017; 37:1163-1178. [PMID: 28079433 PMCID: PMC5363492 DOI: 10.1177/0271678x16685105] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Cannabinoid type 2 receptors (CB2R) have emerged as promising targets for the diagnosis and therapy of brain pathologies. However, no suitable radiotracers for accurate CB2R mapping have been found to date, limiting the investigation of the CB2 receptor expression using positron emission tomography (PET) imaging. In this work, we report the evaluation of the in vivo expression of CB2R with [11C]A-836339 PET after cerebral ischemia and in two rat models of neuroinflammation, first by intrastriatal LPS and then by AMPA injection. PET images and in vitro autoradiography showed a lack of specific [11C]A-836339 uptake in these animal models demonstrating the limitation of this radiotracer to image CB2 receptor under neuroinflammatory conditions. Further, using immunohistochemistry, the CB2 receptor displayed a modest expression increase after cerebral ischemia, LPS and AMPA models. Finally, [18F]DPA-714-PET and immunohistochemistry demonstrated decreased neuroinflammation by a selective CB2R agonist, JWH133. Taken together, these findings suggest that [11C]A-836339 is not a suitable radiotracer to monitor in vivo CB2R expression by using PET imaging. Future studies will have to investigate alternative radiotracers that could provide an accurate binding to CB2 receptors following brain inflammation.
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Affiliation(s)
- Geraldine Pottier
- 1 Imagerie Moléculaire In Vivo, Inserm, CEA, Univ. Paris Sud, CNRS, Université Paris Saclay, CEA - Service Hospitalier Frédéric Joliot, Orsay, France
| | | | - Daniel Padro
- 3 Magnetic Resonance Imaging, CIC biomaGUNE, San Sebastian, Spain
| | - Raphaël Boisgard
- 1 Imagerie Moléculaire In Vivo, Inserm, CEA, Univ. Paris Sud, CNRS, Université Paris Saclay, CEA - Service Hospitalier Frédéric Joliot, Orsay, France
| | - Frédéric Dollé
- 1 Imagerie Moléculaire In Vivo, Inserm, CEA, Univ. Paris Sud, CNRS, Université Paris Saclay, CEA - Service Hospitalier Frédéric Joliot, Orsay, France
| | - Jordi Llop
- 2 Radiochemistry and Nuclear Imaging, CIC biomaGUNE, San Sebastian, Spain
| | - Alexandra Winkeler
- 1 Imagerie Moléculaire In Vivo, Inserm, CEA, Univ. Paris Sud, CNRS, Université Paris Saclay, CEA - Service Hospitalier Frédéric Joliot, Orsay, France
| | - Abraham Martín
- 4 Molecular Imaging Unit, CIC biomaGUNE, San Sebastian, Spain
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Maali A, Boisgard R, Chraibi H, Zhang Z, Kellay H, Würger A. Viscoelastic Drag Forces and Crossover from No-Slip to Slip Boundary Conditions for Flow near Air-Water Interfaces. Phys Rev Lett 2017; 118:084501. [PMID: 28282178 DOI: 10.1103/physrevlett.118.084501] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Indexed: 06/06/2023]
Abstract
The "free" water surface is generally prone to contamination with surface impurities, be they surfactants, particles, or other surface active agents. The presence of such impurities can modify flow near such interfaces in a drastic manner. Here we show that vibrating a small sphere mounted on an atomic force microscope cantilever near a gas bubble immersed in water is an excellent probe of surface contamination. Both viscous and elastic forces are exerted by an air-water interface on the vibrating sphere even when very low doses of contaminants are present. The viscous drag forces show a crossover from no-slip to slip boundary conditions while the elastic forces show a nontrivial variation as the vibration frequency changes. We provide a simple model to rationalize these results and propose a simple way of evaluating the concentration of such surface impurities.
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Affiliation(s)
- A Maali
- Université de Bordeaux & CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - R Boisgard
- Université de Bordeaux & CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - H Chraibi
- Université de Bordeaux & CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - Z Zhang
- Université de Bordeaux & CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - H Kellay
- Université de Bordeaux & CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - A Würger
- Université de Bordeaux & CNRS, LOMA, UMR 5798, F-33400 Talence, France
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Orlhac F, Thézé B, Soussan M, Boisgard R, Buvat I. Multiscale Texture Analysis: From 18F-FDG PET Images to Histologic Images. J Nucl Med 2016; 57:1823-1828. [DOI: 10.2967/jnumed.116.173708] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 04/28/2016] [Indexed: 12/17/2022] Open
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Cabon Q, Sayag D, Texier I, Navarro F, Boisgard R, Virieux-Watrelot D, Ponce F, Carozzo C. Evaluation of intraoperative fluorescence imaging-guided surgery in cancer-bearing dogs: a prospective proof-of-concept phase II study in 9 cases. Transl Res 2016; 170:73-88. [PMID: 26746803 DOI: 10.1016/j.trsl.2015.12.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2015] [Revised: 12/04/2015] [Accepted: 12/09/2015] [Indexed: 01/26/2023]
Abstract
The objective was to prospectively evaluate the application of intraoperative fluorescence imaging (IOFI) in the surgical excision of malignant masses in dogs, using a novel lipid nanoparticle contrast agent. Dogs presenting with spontaneous soft-tissue sarcoma or subcutaneous tumors were prospectively enrolled. Clinical staging and whole-body computed tomography (CT) were performed. All the dogs received an intravenous injection of dye-loaded lipid nanoparticles, LipImage 815. Wide or radical resection was realized after CT examination. Real-time IOFI was performed before skin incision and after tumor excision. In cases of radical resection, the lymph nodes (LNs) were imaged. The margin/healthy tissues fluorescence ratio or LN/healthy tissues fluorescence ratio was measured and compared with the histologic margins or LN status. Nine dogs were included. Limb amputation was performed in 3 dogs, and wide resection in 6. No adverse effect was noted. Fluorescence was observed in all 9 of the tumors. The margins were clean in 5 of 6 dogs after wide surgical resection, and the margin/healthy tissues fluorescence ratio was close to 1.0 in all these dogs. Infiltrated margins were observed in 1 case, with a margin/healthy tissues fluorescence ratio of 3.2. Metastasis was confirmed in 2 of 3 LNs, associated with LN/healthy tissues fluorescence ratios of 2.1 and 4.2, whereas nonmetastatic LN was associated with a ratio of 1.0. LipImage 815 used as a contrast agent during IOFI seemed to allow for good discrimination between tumoral and healthy tissues. Future studies are scheduled to evaluate the sensitivity and specificity of IOFI using LipImage 815 as a tracer.
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Affiliation(s)
- Quentin Cabon
- From the Surgery and Anesthesia Unit, VetAgro-Sup Campus Vétérinaire de Lyon, Marcy l'Etoile, France.
| | - David Sayag
- Clinical Oncology Department, Small Animal Internal Medicine Unit, VetAgro-Sup Campus Vétérinaire de Lyon, Marcy l'Etoile, France
| | - Isabelle Texier
- Université Grenoble Alpes, Grenoble, France; CEA-LETI MINATEC/ DTBS, Grenoble, France.
| | - Fabrice Navarro
- Université Grenoble Alpes, Grenoble, France; CEA-LETI MINATEC/ DTBS, Grenoble, France
| | | | | | - Frédérique Ponce
- Clinical Oncology Department, Small Animal Internal Medicine Unit, VetAgro-Sup Campus Vétérinaire de Lyon, Marcy l'Etoile, France
| | - Claude Carozzo
- From the Surgery and Anesthesia Unit, VetAgro-Sup Campus Vétérinaire de Lyon, Marcy l'Etoile, France
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Sayag D, Cabon Q, Texier I, Navarro FP, Boisgard R, Virieux-Watrelot D, Carozzo C, Ponce F. Phase-0/phase-I study of dye-loaded lipid nanoparticles for near-infrared fluorescence imaging in healthy dogs. Eur J Pharm Biopharm 2016; 100:85-93. [PMID: 26777342 DOI: 10.1016/j.ejpb.2016.01.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 11/28/2015] [Accepted: 01/04/2016] [Indexed: 01/12/2023]
Abstract
Near-infrared (NIR) fluorescence imaging using FDA-approved indocyanine green (ICG) has been the subject of numerous studies during the past few years. It could constitute a potentially exciting new paradigm shift in veterinary oncology, especially to develop in vivo fluorescence imaging diagnostics and surgery guidance methods. The objective of this study was to evaluate the pharmacologic and toxicological characteristics in healthy beagle dogs of LipImage™ 815, a formulation made of NIR-dye-loaded lipid nanoparticles. The initial dosage for the evaluation of biodistribution was extrapolated from data in mice and then adapted to define the more adapted dose (MAD) according to the fluorescence results obtained in 5 dogs using a Fluobeam® 800 imaging device (phase 0 study). A single dose acute toxicity study was then performed (3 dogs, phase I study). Before the systemic administration of LipImage™ 815, the dogs presented a very mild residual fluorescence, particularly in the liver and kidneys. After injection, the plasma fluorescence continuously decreased, and the signal was relatively homogeneously distributed throughout the different organs, though more pronounced in the liver and to a lesser extent in the steroid-rich organs (adrenal, ovaries), intestines, lymph nodes and kidneys. A MAD of 2.0μg/kg was found. No evidence of acute or delayed general, hepatic, renal or hematologic toxicity was observed at 1-fold, 5-fold or 10-fold MAD. The results of this phase-0/phase-I study showed that an optimal dosage of LipImage™ 815 of 2.0μg/kg allowed the achievement of a fluorescence signal suitable for surgery guidance application without any acute side effects.
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Affiliation(s)
- David Sayag
- Clinical Oncology Department, Small Animal Internal Medicine Unit, VetAgro Sup Campus Vétérinaire de Lyon, 1 avenue Bourgelat, F-69280 Marcy l'Etoile, France.
| | - Quentin Cabon
- Surgery and Anesthesia Unit, VetAgro Sup Campus Vétérinaire de Lyon, 1 avenue Bourgelat, F-69280 Marcy l'Etoile, France
| | - Isabelle Texier
- Univ. Grenoble Alpes, F-38000 Grenoble, France; CEA LETI, MINATEC Campus, Technologies for Healthcare and Biology Division, 17 rue des Martyrs, F-38054 Grenoble, France.
| | - Fabrice P Navarro
- Univ. Grenoble Alpes, F-38000 Grenoble, France; CEA LETI, MINATEC Campus, Technologies for Healthcare and Biology Division, 17 rue des Martyrs, F-38054 Grenoble, France
| | - Raphaël Boisgard
- CEA I2BM SHFJ INSERM U1023, 4 place du Général, Leclerc, 91400 Orsay, France
| | - Dorothée Virieux-Watrelot
- Pathology Unit, VetAgro Sup Campus Vétérinaire de Lyon, 1 avenue Bourgelat, 69280 Marcy l'Etoile, France; ICE 2011-03-101 Research Unit, VetAgro Sup Campus Vétérinaire de Lyon, 1 avenue Bourgelat, 69280 Marcy l'Etoile, France
| | - Claude Carozzo
- Surgery and Anesthesia Unit, VetAgro Sup Campus Vétérinaire de Lyon, 1 avenue Bourgelat, F-69280 Marcy l'Etoile, France; ICE 2011-03-101 Research Unit, VetAgro Sup Campus Vétérinaire de Lyon, 1 avenue Bourgelat, 69280 Marcy l'Etoile, France
| | - Frédérique Ponce
- Clinical Oncology Department, Small Animal Internal Medicine Unit, VetAgro Sup Campus Vétérinaire de Lyon, 1 avenue Bourgelat, F-69280 Marcy l'Etoile, France; ICE 2011-03-101 Research Unit, VetAgro Sup Campus Vétérinaire de Lyon, 1 avenue Bourgelat, 69280 Marcy l'Etoile, France
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10
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Laurent D, Vinet L, Lamprianou S, Daval M, Filhoulaud G, Ktorza A, Wang H, Sewing S, Juretschke HP, Glombik H, Meda P, Boisgard R, Nguyen DL, Stasiuk GJ, Long NJ, Montet X, Hecht P, Kramer W, Rutter GA, Hecksher-Sørensen J. Pancreatic β-cell imaging in humans: fiction or option? Diabetes Obes Metab 2016; 18:6-15. [PMID: 26228188 DOI: 10.1111/dom.12544] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 07/02/2015] [Accepted: 07/28/2015] [Indexed: 01/02/2023]
Abstract
Diabetes mellitus is a growing worldwide epidemic disease, currently affecting 1 in 12 adults. Treatment of disease complications typically consumes ∼10% of healthcare budgets in developed societies. Whilst immune-mediated destruction of insulin-secreting pancreatic β cells is responsible for Type 1 diabetes, both the loss and dysfunction of these cells underly the more prevalent Type 2 diabetes. The establishment of robust drug development programmes aimed at β-cell restoration is still hampered by the absence of means to measure β-cell mass prospectively in vivo, an approach which would provide new opportunities for understanding disease mechanisms and ultimately assigning personalized treatments. In the present review, we describe the progress towards this goal achieved by the Innovative Medicines Initiative in Diabetes, a collaborative public-private consortium supported by the European Commission and by dedicated resources of pharmaceutical companies. We compare several of the available imaging methods and molecular targets and provide suggestions as to the likeliest to lead to tractable approaches. Furthermore, we discuss the simultaneous development of animal models that can be used to measure subtle changes in β-cell mass, a prerequisite for validating the clinical potential of the different imaging tracers.
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Affiliation(s)
- D Laurent
- Biomarker Department, Clinical Imaging, Novartis Institutes for Biomedical Research, Basel, Switzerland
| | - L Vinet
- Department of Genetic Medicine and Development, University of Geneva, Geneva, Switzerland
| | - S Lamprianou
- Department of Genetic Medicine and Development, University of Geneva, Geneva, Switzerland
| | - M Daval
- Metabolic Diseases Department, Servier Research Institute, Suresnes, France
| | - G Filhoulaud
- Metabolic Diseases Department, Servier Research Institute, Suresnes, France
| | - A Ktorza
- Metabolic Diseases Department, Servier Research Institute, Suresnes, France
| | - H Wang
- Roche Pharma Research and Early Development, Innovation Center Basel, Basel, Switzerland
| | - S Sewing
- Roche Pharma Research and Early Development, Innovation Center Basel, Basel, Switzerland
| | - H-P Juretschke
- Sanofi-Aventis Deutschland GmbH, Frankfurt am Main, Germany
| | - H Glombik
- Sanofi-Aventis Deutschland GmbH, Frankfurt am Main, Germany
| | - P Meda
- Department of Cell Physiology and Metabolism, University of Geneva, Geneva, Switzerland
| | - R Boisgard
- Commissariat à l'Energie Atomique, Equipe d'Imagerie Moléculaire Expérimentale, Orsay, France
| | - D L Nguyen
- Commissariat à l'Energie Atomique, Equipe d'Imagerie Moléculaire Expérimentale, Orsay, France
| | - G J Stasiuk
- Department of Chemistry, Imperial College London, London, UK
| | - N J Long
- Department of Chemistry, Imperial College London, London, UK
| | - X Montet
- Department of Radiology, Geneva University Hospital, Geneva, Switzerland
| | - P Hecht
- IMIDIA Project Office, Graz, Austria
| | - W Kramer
- Scientific Consultant for Sanofi Deutschland GmbH, Frankfurt am Main, Germany
| | - G A Rutter
- Section of Cell Biology and Functional Genomics, Department of Medicine, Imperial Centre for Translational and Experimental Medicine, Imperial College London, Hammersmith Hospital, London, UK
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11
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Kuhnast B, El Hadri A, Boisgard R, Hinnen F, Richard S, Caravano A, Nancy-Portebois V, Petitou M, Tavitian B, Dollé F. Synthesis, radiolabeling with fluorine-18 and preliminary in vivo evaluation of a heparan sulphate mimetic as potent angiogenesis and heparanase inhibitor for cancer applications. Org Biomol Chem 2016; 14:1915-20. [DOI: 10.1039/c5ob02513c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A rationally designed, fully synthetic, octasaccharide-based, HS mimetic has been synthesized, in vitro characterized, labeled with fluorine-18, and in vivo imaged with PET in rats.
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Affiliation(s)
- B. Kuhnast
- CEA
- Institut d'imagerie biomédicale
- Service Hospitalier Frédéric Joliot
- 91400 Orsay
- France
| | - A. El Hadri
- Endotis Pharma
- Biocitech Park
- 93230 Romainville
- France
- CarboMimetics
| | - R. Boisgard
- CEA
- Institut d'imagerie biomédicale
- Service Hospitalier Frédéric Joliot
- 91400 Orsay
- France
| | - F. Hinnen
- CEA
- Institut d'imagerie biomédicale
- Service Hospitalier Frédéric Joliot
- 91400 Orsay
- France
| | - S. Richard
- Endotis Pharma
- Biocitech Park
- 93230 Romainville
- France
| | - A. Caravano
- Endotis Pharma
- Biocitech Park
- 93230 Romainville
- France
| | | | - M. Petitou
- Endotis Pharma
- Biocitech Park
- 93230 Romainville
- France
| | - B. Tavitian
- Laboratoire PARCC UMR 970 Inserm/Université Paris Descartes
- Sorbonne Paris Cité
- Assistance Publique – Hôpitaux de Paris
- Hôpital Européen Georges Pompidou
- 75015 Paris
| | - F. Dollé
- CEA
- Institut d'imagerie biomédicale
- Service Hospitalier Frédéric Joliot
- 91400 Orsay
- France
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12
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Pottier G, Marie S, Goutal S, Auvity S, Peyronneau MA, Stute S, Boisgard R, Dollé F, Buvat I, Caillé F, Tournier N. Imaging the Impact of the P-Glycoprotein (ABCB1) Function on the Brain Kinetics of Metoclopramide. J Nucl Med 2015; 57:309-14. [PMID: 26585058 DOI: 10.2967/jnumed.115.164350] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Accepted: 11/02/2015] [Indexed: 12/25/2022] Open
Abstract
UNLABELLED The effects of metoclopramide on the central nervous system (CNS) in patients suggest substantial brain distribution. Previous data suggest that metoclopramide brain kinetics may nonetheless be controlled by ATP-binding cassette (ABC) transporters expressed at the blood-brain barrier. We used (11)C-metoclopramide PET imaging to elucidate the kinetic impact of transporter function on metoclopramide exposure to the brain. METHODS (11)C-metoclopramide transport by P-glycoprotein (P-gp; ABCB1) and the breast cancer resistance protein (BCRP; ABCG2) was tested using uptake assays in cells overexpressing P-gp and BCRP. (11)C-metoclopramide brain kinetics were compared using PET in rats (n = 4-5) in the absence and presence of a pharmacologic dose of metoclopramide (3 mg/kg), with or without P-gp inhibition using intravenous tariquidar (8 mg/kg). The (11)C-metoclopramide brain distribution (VT based on Logan plot analysis) and brain kinetics (2-tissue-compartment model) were characterized with either a measured or an imaged-derived input function. Plasma and brain radiometabolites were studied using radio-high-performance liquid chromatography analysis. RESULTS (11)C-metoclopramide transport was selective for P-gp over BCRP. Pharmacologic dose did not affect baseline (11)C-metoclopramide brain kinetics (VT = 2.28 ± 0.32 and 2.04 ± 0.19 mL⋅cm(-3) using microdose and pharmacologic dose, respectively). Tariquidar significantly enhanced microdose (11)C-metoclopramide VT (7.80 ± 1.43 mL⋅cm(-3)) with a 4.4-fold increase in K1 (influx rate constant) and a 2.3-fold increase in binding potential (k3/k4) in the 2-tissue-compartment model. In the pharmacologic situation, P-gp inhibition significantly increased metoclopramide brain distribution (VT = 6.28 ± 0.48 mL⋅cm(-3)) with a 2.0-fold increase in K1 and a 2.2-fold decrease in k2 (efflux rate), with no significant impact on binding potential. In this situation, only parent (11)C-metoclopramide could be detected in the brains of P-gp-inhibited rats. CONCLUSION (11)C-metoclopramide benefits from favorable pharmacokinetic properties that offer reliable quantification of P-gp function at the blood-brain barrier in a pharmacologic situation. Using metoclopramide as a model of CNS drug, we demonstrated that P-gp function not only reduces influx but also mediates the efflux from the brain back to the blood compartment, with additional impact on brain distribution. This PET-based strategy of P-gp function investigation may provide new insight on the contribution of P-gp to the variability of response to CNS drugs between patients.
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Affiliation(s)
- Géraldine Pottier
- Inserm/CEA/Université Paris Sud, UMR 1023 - ERL 9218 CNRS, IMIV, Orsay, France; and CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Solène Marie
- Inserm/CEA/Université Paris Sud, UMR 1023 - ERL 9218 CNRS, IMIV, Orsay, France; and CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Sébastien Goutal
- Inserm/CEA/Université Paris Sud, UMR 1023 - ERL 9218 CNRS, IMIV, Orsay, France; and CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Sylvain Auvity
- Inserm/CEA/Université Paris Sud, UMR 1023 - ERL 9218 CNRS, IMIV, Orsay, France; and CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Marie-Anne Peyronneau
- Inserm/CEA/Université Paris Sud, UMR 1023 - ERL 9218 CNRS, IMIV, Orsay, France; and CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Simon Stute
- Inserm/CEA/Université Paris Sud, UMR 1023 - ERL 9218 CNRS, IMIV, Orsay, France; and CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Raphaël Boisgard
- Inserm/CEA/Université Paris Sud, UMR 1023 - ERL 9218 CNRS, IMIV, Orsay, France; and CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Frédéric Dollé
- Inserm/CEA/Université Paris Sud, UMR 1023 - ERL 9218 CNRS, IMIV, Orsay, France; and CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Irène Buvat
- Inserm/CEA/Université Paris Sud, UMR 1023 - ERL 9218 CNRS, IMIV, Orsay, France; and CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Fabien Caillé
- Inserm/CEA/Université Paris Sud, UMR 1023 - ERL 9218 CNRS, IMIV, Orsay, France; and CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Nicolas Tournier
- Inserm/CEA/Université Paris Sud, UMR 1023 - ERL 9218 CNRS, IMIV, Orsay, France; and CEA, DSV, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France
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13
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Vermeulen C, Noury B, Dolle F, Rebergue H, Boisgard R. Microbial Safety Assessment of a Double Check-Valve Patient Line in a Multiuse Contrast Delivery System. Radiol Technol 2015; 87:139-149. [PMID: 26538217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
PURPOSE To demonstrate the microbial safety of a secure filling and injection kit designed to allow for multiple injections of contrast media from a single large-volume container in computed tomography (CT) and magnetic resonance (MR) imaging examinations. METHODS Two male Papio anubis baboons were injected with technetium-99 labeled albumin to mimic a contaminated patient. Researchers injected iodinated contrast medium into the animals using an automated power injector via an antecubital vein, with an injection line fitted with a double check-valve positioned at a 45° angle toward the vein (worst-case condition). Two contact times (before and after injection) were assessed in 3 experiments and repeated 3 times for a total of 9 tested lines. Radioactivity levels were measured in the animals' plasma and in the injection system. RESULTS Crude values were corrected for background signal and technetium Tc 99m radioactive decay. Results showed an absence of contamination in the line above the check-valve. Negative results were because the mean value of background noise was similar to the crude values measured. DISCUSSION Injecting contrast media from a large-volume container decreases the cost of CT and MR examinations. However, this practice, which involves the use of the same injection system for multiple patients, is associated with a risk of cross-contamination and requires manufacturers to demonstrate the safety of reusable injection kits. CONCLUSION Based on appropriate demonstration of worst-case conditions and the use of a radiolabeled molecule mimicking a pathogen particle (ie, as small as viral particles), this study highlights the safety and performance of the tested injection system to perform repeated injections from a multidose container to more than one patient, regardless of the conditions and duration of the examination.
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14
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Damont A, Médran-Navarrete V, Cacheux F, Kuhnast B, Pottier G, Bernards N, Marguet F, Puech F, Boisgard R, Dollé F. Novel Pyrazolo[1,5-a]pyrimidines as Translocator Protein 18 kDa (TSPO) Ligands: Synthesis, in Vitro Biological Evaluation, [(18)F]-Labeling, and in Vivo Neuroinflammation PET Images. J Med Chem 2015; 58:7449-64. [PMID: 26280386 DOI: 10.1021/acs.jmedchem.5b00932] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A series of novel pyrazolo[1,5-a]pyrimidines, closely related to N,N-diethyl-2-(2-(4-(2-fluoroethoxy)phenyl)-5,7-dimethylpyrazolo[1,5-a]pyrimidin-3-yl)acetamide (2, DPA-714), were synthesized and biologically in vitro evaluated for their potential to bind the translocator protein 18 kDa (TSPO), a protein today recognized as an early biomarker of neuroinflammatory processes. This series is composed of fluoroalkyl- and fluoroalkynyl- analogues, prepared from a common iodinated intermediate via Sonogashira coupling reactions. All derivatives displayed subnanomolar affinity for the TSPO (0.37 to 0.86 nM), comparable to that of 2 (0.91 nM). Two of them were radiolabeled with fluorine-18, and their biodistribution was investigated by in vitro autoradiography and positron emission tomography (PET) imaging on a rodent model of neuroinflammation. Brain uptake and local accumulation of both compounds in the AMPA-mediated lesion confirm their potential as in vivo PET-radiotracers. In particular, [(18)F]23 exhibited a significantly higher ipsi- to contralateral ratio at 60 min than the parent molecule [(18)F]2 in vivo.
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Affiliation(s)
- Annelaure Damont
- CEA, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France.,Inserm/CEA/Université Paris Sud, UMR 1023-ERL 9218 CNRS, IMIV, Orsay, France
| | - Vincent Médran-Navarrete
- CEA, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France.,Inserm/CEA/Université Paris Sud, UMR 1023-ERL 9218 CNRS, IMIV, Orsay, France
| | - Fanny Cacheux
- CEA, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France.,Inserm/CEA/Université Paris Sud, UMR 1023-ERL 9218 CNRS, IMIV, Orsay, France
| | - Bertrand Kuhnast
- CEA, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France.,Inserm/CEA/Université Paris Sud, UMR 1023-ERL 9218 CNRS, IMIV, Orsay, France
| | - Géraldine Pottier
- CEA, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France.,Inserm/CEA/Université Paris Sud, UMR 1023-ERL 9218 CNRS, IMIV, Orsay, France
| | - Nicholas Bernards
- CEA, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France.,Inserm/CEA/Université Paris Sud, UMR 1023-ERL 9218 CNRS, IMIV, Orsay, France
| | | | | | - Raphaël Boisgard
- CEA, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France.,Inserm/CEA/Université Paris Sud, UMR 1023-ERL 9218 CNRS, IMIV, Orsay, France
| | - Frédéric Dollé
- CEA, I2BM, Service Hospitalier Frédéric Joliot, Orsay, France.,Inserm/CEA/Université Paris Sud, UMR 1023-ERL 9218 CNRS, IMIV, Orsay, France
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15
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Thézé B, Bernards N, Beynel A, Bouet S, Kuhnast B, Buvat I, Tavitian B, Boisgard R. Monitoring therapeutic efficacy of sunitinib using [(18)F]FDG and [(18)F]FMISO PET in an immunocompetent model of luminal B (HER2-positive)-type mammary carcinoma. BMC Cancer 2015. [PMID: 26198000 PMCID: PMC4511439 DOI: 10.1186/s12885-015-1540-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Background Clinical studies implying the sunitinib multi-kinase inhibitor have led to disappointing results for breast cancer care but mostly focused on HER2-negative subtypes. Preclinical researches involving this drug mostly concern Triple Negative Breast Cancer (TNBC) murine models. Here, we explored the therapeutic efficacy of sunitinib on a PyMT-derived transplanted model classified as luminal B (HER2-positive) and monitored the response to treatment using both in vivo and ex vivo approaches. Methods Tumour-induced animals were treated for 9 (n = 7) or 14 (n = 8) days with sunitinib at 40 mg/kg or with vehicle only. Response to therapy was assessed in vivo by monitoring glucose tumour metabolism and hypoxia using 2-deoxy-2-[18F]fluoro-D-glucose ([18F]FDG) and [18F]fluoromisonidazole ([18F]FMISO) Positron Emission Tomography (PET). After primary tumour excision, ex vivo digital microscopy was performed on treated and control samples to estimate vascular density (CD31), apoptosis (Tunel), proliferation (Ki-67), Tumour-Associated Macrophage (TAM) infiltration (F4/80), metabolism (GLUT1) and cellular response to hypoxia (HIF1 alpha). The drug impact on the metastasis rate was evaluated by monitoring the PyMT gene expression in the lungs of the treated and control groups. Results Concomitant with sunitinib-induced tumour size regression, [18F]FDG PET imaging showed a stable glycolysis-related metabolism inside tumours undergoing treatment compared to an increased metabolism in untreated tumours, resulting at treatment end in 1.5 less [18F]FDG uptake in treated (n = 4) vs control (n = 3) tumours (p < 0.05). With this small sample, [18F]FMISO PET showed a non-significant decrease of hypoxia in treated vs control tumours. The drug triggered a 4.9 fold vascular volume regression (p < 0.05), as well as a 17.7 fold induction of tumour cell apoptosis (p < 0.001). The hypoxia induced factor 1 alpha (HIF1 alpha) expression was twice lower in the treated group than in the control group (p < 0.05). Moreover, the occurrence of lung metastases was not reduced by the drug. Conclusions [18F]FDG and [18F]FMISO PET were relevant approaches to study the response to sunitinib in this luminal B (HER2-positive) model. The sunitinib-induced vascular network shrinkage did not significantly increase tumour hypoxia, suggesting that tumour regression was mainly due to the pro-apoptotic properties of the drug. Sunitinib did not inhibit the metastatic process in this PyMT transplanted model. Electronic supplementary material The online version of this article (doi:10.1186/s12885-015-1540-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Benoît Thézé
- Laboratoire Imagerie Moléculaire In Vivo (IMIV, UMR 1023 Inserm/CEA/Université Paris Sud - ERL 9218 CNRS, CEA/I²BM/SHFJ, 4 place du Général Leclerc, 91400, Orsay, France.
| | - Nicholas Bernards
- Laboratoire Imagerie Moléculaire In Vivo (IMIV, UMR 1023 Inserm/CEA/Université Paris Sud - ERL 9218 CNRS, CEA/I²BM/SHFJ, 4 place du Général Leclerc, 91400, Orsay, France.
| | - Audrey Beynel
- Laboratoire Imagerie Moléculaire In Vivo (IMIV, UMR 1023 Inserm/CEA/Université Paris Sud - ERL 9218 CNRS, CEA/I²BM/SHFJ, 4 place du Général Leclerc, 91400, Orsay, France.
| | - Stephan Bouet
- Animal Genetics and Integrative Biology, INRA-AgroParisTech, UMR 1313, Jouy-en-Josas, France. .,Laboratory of Radiobiology and Genomics Studies, CEA, DSV, IRCM, SREIT, Jouy-en-Josas, France.
| | - Bertrand Kuhnast
- Laboratoire Imagerie Moléculaire In Vivo (IMIV, UMR 1023 Inserm/CEA/Université Paris Sud - ERL 9218 CNRS, CEA/I²BM/SHFJ, 4 place du Général Leclerc, 91400, Orsay, France.
| | - Irène Buvat
- Laboratoire Imagerie Moléculaire In Vivo (IMIV, UMR 1023 Inserm/CEA/Université Paris Sud - ERL 9218 CNRS, CEA/I²BM/SHFJ, 4 place du Général Leclerc, 91400, Orsay, France.
| | | | - Raphaël Boisgard
- Laboratoire Imagerie Moléculaire In Vivo (IMIV, UMR 1023 Inserm/CEA/Université Paris Sud - ERL 9218 CNRS, CEA/I²BM/SHFJ, 4 place du Général Leclerc, 91400, Orsay, France.
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16
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Mérian J, Boisgard R, Bayle PA, Bardet M, Tavitian B, Texier I. Comparative biodistribution in mice of cyanine dyes loaded in lipid nanoparticles. Eur J Pharm Biopharm 2015; 93:1-10. [PMID: 25805562 DOI: 10.1016/j.ejpb.2015.03.019] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 03/13/2015] [Accepted: 03/16/2015] [Indexed: 12/14/2022]
Abstract
Two near infrared cyanine dyes, DiD (1,1'-dioctadecyl-3,3,3',3'-tetramethylindotricarbocyanine perchlorate) and ICG (Indocyanine Green) were loaded in lipid nanoparticles (LNP). DiD-LNP and ICG-LNP presented similar physicochemical characteristics (hydrodynamic diameter, polydispersity, zeta potential), encapsulation efficiency, and colloidal stability when stored in PBS buffer. However, whereas DiD had similar biodistribution than cholesteryl-1-(14)C-oleate ([(14)C]CHO, a constituent of the nanoparticle used as a reference radiotracer), ICG displayed a different biodistribution pattern, similar to that of the free dye, indicative of its immediate leakage from the nanovector after blood injection. NMR spectroscopy using Proton NOE (Nuclear Overhauser Effect) measurements showed that the localization of the dye in the lipid nanoparticles was slightly different: ICG, more amphiphilic than DiD, was found both inside the lipid core and at particle interface, whereas DiD, more hydrophobic, appeared exclusively located inside the particle core. The ICG release rate from the particles was 7% per 1 month under storage conditions (4 °C, dark, 10% of lipids), whereas no leakage could be detected for DiD. ICG leakage increased considerably in the presence of BSA 40 g/L (45% leakage in 24h at 100 mg/mL of lipids), because of the high affinity of the fluorophore for plasma proteins. On the contrary, no DiD leakage was observed, until high dilution of the nanoparticles which triggered their dissociation (45% leakage in 24h at 1 mg/mL of lipids). Altogether, the subtle difference in dye localization into the nanoparticles, the partial dissociation of the LNP in diluted media, and more importantly the high ICG affinity for plasma proteins, accounted for the differences observed in the fluorescence biodistribution after tail vein injection of the dye-loaded nanoparticles.
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Affiliation(s)
- Juliette Mérian
- Université Grenoble Alpes, F-38000 Grenoble, France; CEA-LETI MINATEC/ DTBS, 17 avenue des Martyrs, F-38054 Grenoble Cedex 9, France; SHFJ, CEA Orsay, 4 place Général Leclerc, 91401 Orsay Cedex, France; INSERM UMR 970, PARCC, Université Paris Descartes, Sorbonne Paris Cité, France; Assistance Publique des Hopitaux de Paris, Hôpital Européen Georges Pompidou, Paris, France
| | - Raphaël Boisgard
- SHFJ, CEA Orsay, 4 place Général Leclerc, 91401 Orsay Cedex, France
| | - Pierre-Alain Bayle
- Université Grenoble Alpes, INAC-SCIB, LRM, F-38000 Grenoble, France; CEA, INAC-SCIB, LRM, F-38054 Grenoble, France
| | - Michel Bardet
- Université Grenoble Alpes, INAC-SCIB, LRM, F-38000 Grenoble, France; CEA, INAC-SCIB, LRM, F-38054 Grenoble, France
| | - Bertrand Tavitian
- INSERM UMR 970, PARCC, Université Paris Descartes, Sorbonne Paris Cité, France; Assistance Publique des Hopitaux de Paris, Hôpital Européen Georges Pompidou, Paris, France
| | - Isabelle Texier
- Université Grenoble Alpes, F-38000 Grenoble, France; CEA-LETI MINATEC/ DTBS, 17 avenue des Martyrs, F-38054 Grenoble Cedex 9, France.
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17
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Médran-Navarrete V, Bernards N, Kuhnast B, Damont A, Pottier G, Peyronneau MA, Kassiou M, Marguet F, Puech F, Boisgard R, Dollé F. [18F]DPA-C5yne, a novel fluorine-18-labelled analogue of DPA-714: radiosynthesis and preliminary evaluation as a radiotracer for imaging neuroinflammation with PET. J Labelled Comp Radiopharm 2014; 57:410-8. [PMID: 24764161 DOI: 10.1002/jlcr.3199] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 03/17/2014] [Accepted: 03/19/2014] [Indexed: 12/13/2022]
Abstract
DPA-C5yne, the lead compound of a novel series of DPA-714 derivatives in which the fluoroethoxy chain linked to the phenylpyrazolopyrimidine scaffold has been replaced by a fluoroalkyn-1-yl moiety, is a high affinity (Ki : 0.35 nM) and selective ligand targeting the translocator protein 18 kDa. In the present work, DPA-C5yne was labelled with no-carrier-added [(18)F]fluoride based on a one-step tosyloxy-for-fluorine nucleophilic substitution reaction, purified by cartridge and HPLC, and formulated as an i.v. injectable solution using a TRACERLab FX N Pro synthesizer. Typically, 4.3-5.2 GBq of [(18)F]DPA-C5yne, ready-to-use, chemically and radiochemically pure (> 95%), was obtained with specific radioactivities ranging from 55 to 110 GBq/µmol within 50-60 min, starting from a 30 GBq [(18)F]fluoride batch (14-17%). LogP and LogD of [(18)F]DPA-C5yne were measured using the shake-flask method and values of 2.39 and 2.51 were found, respectively. Autoradiography studies performed on slices of ((R,S)-α-amino-3-hydroxy-5-methyl-4-isoxazolopropionique (AMPA)-lesioned rat brains showed a high target-to-background ratio (1.9 ± 0.3). Selectivity and specificity of the binding for the translocator protein was demonstrated using DPA-C5yne (unlabelled), PK11195 and Flumazenil (central benzodiazepine receptor ligand) as competitors. Furthermore, DPA-C5yne proved to be stable in plasma at 37°C for at least 90 min.
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Médran-Navarrete V, Damont A, Peyronneau MA, Kuhnast B, Bernards N, Pottier G, Marguet F, Puech F, Boisgard R, Dollé F. Preparation and evaluation of novel pyrazolo[1,5-a]pyrimidine acetamides, closely related to DPA-714, as potent ligands for imaging the TSPO 18kDa with PET. Bioorg Med Chem Lett 2014; 24:1550-6. [DOI: 10.1016/j.bmcl.2014.01.080] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 01/24/2014] [Accepted: 01/27/2014] [Indexed: 12/13/2022]
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Awde AR, Boisgard R, Thézé B, Dubois A, Zheng J, Dollé F, Jacobs AH, Tavitian B, Winkeler A. The translocator protein radioligand 18F-DPA-714 monitors antitumor effect of erufosine in a rat 9L intracranial glioma model. J Nucl Med 2013; 54:2125-31. [PMID: 24212976 DOI: 10.2967/jnumed.112.118794] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
UNLABELLED On the one hand, the translocator protein (TSPO) radioligand N,N-diethyl-2-(2-(4-(2-(18)F-fluoroethoxy)phenyl)-5,7-dimethylpyrazolo[1,5-a]pyrimidin-3-yl)acetamide ((18)F-DPA-714) has been suggested to serve as an alternative radiotracer to image human glioma, and on the other hand the alkylphosphocholine erufosine (ErPC3) has been reported to induce apoptosis in otherwise highly apoptosis-resistant glioma cell lines. The induction of apoptosis by ErPC3 requires TSPO, a mitochondrial membrane protein highly expressed in malignant gliomas. In this preclinical study, we monitored the effect of ErPC3 treatment in vivo using (18)F-DPA-714 PET. METHODS In vitro studies investigated the antitumor effect of ErPC3 in 9L rat gliosarcoma cells. In vivo, glioma-bearing rats were imaged with (18)F-DPA-714 for the time of treatment. RESULTS A significant decrease in 9L cell proliferation and viability and a significant increase in apoptosis and caspase-3 activation were demonstrated on ErPC3 treatment in cell culture. In the rat model, ErPC3 administration resulted in significant changes in (18)F-DPA-714 tumor uptake over the course of the treatment. Immunohistochemistry revealed reduced tumor volume and increased cell death in ErPC3-treated animals accompanied by infiltration of the tumor core by CD11b-positive microglia/macrophages and glial fibrillary acidic protein-positive astrocytes. CONCLUSION Our findings demonstrate a potent antitumor effect of ErPC3 in vitro, in vivo, and ex vivo. PET imaging of TSPO expression using (18)F-DPA-714 allows effective monitoring and quantification of disease progression and response to ErPC3 therapy in intracranial 9L gliomas.
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Jacquart A, Kéramidas M, Vollaire J, Boisgard R, Pottier G, Rustique E, Mittler F, Navarro FP, Boutet J, Coll JL, Texier I. LipImage™ 815: novel dye-loaded lipid nanoparticles for long-term and sensitive in vivo near-infrared fluorescence imaging. J Biomed Opt 2013; 18:101311. [PMID: 23900442 DOI: 10.1117/1.jbo.18.10.101311] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A new contrast agent, LipImage™ 815, has been designed and compared to previously described indocyanine green (ICG)-loaded lipid nanoparticles (ICG-lipidots®). Both contrast agents display similar size (50-nm diameter), zeta potential, high IC50 in cellular studies, near-infrared absorption and emission wavelengths in the "imaging window," long-term shelf colloidal and optical stabilities with high brightness (>106 L mol-1 cm-1) in ready-to-use storage conditions in aqueous buffer (4°C in dark), therefore being promising fluorescence contrast agents for in vivo imaging. However, while ICG-lipidots® display a relatively short plasma lifetime, LipImage™ 815 circulates in blood for longer times, allowing the efficient uptake of fluorescence signal in human prostate cancer cells implanted in mice. Prolonged tumor labeling is observed for more than 21 days.
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Affiliation(s)
- Aurélie Jacquart
- CEA Grenoble, LETI-DTBS, MINATEC campus, F38054 Grenoble, France
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Abstract
UNLABELLED Lipidots are original nanoparticulate lipid delivery vectors for drugs and contrast agents made from materials generally regarded as safe. Here, we characterized the in vivo stability, biodistribution, and pharmacokinetics of lipidots. METHODS Lipidots 55 nm in diameter and coated with a phospholipid/poly(ethyleneglycol) surfactant shell were triply labeled with (3)H-cholesteryl-hexadecyl-ether, cholesteryl-(14)C-oleate, and the 1,1'-dioctadecyl-3,3,3',3'-tetramethylindotricarbocyanine infrared fluorescent dye and injected intravenously into immunocompetent Friend virus B-type mice. The pharmacokinetics and biodistribution of lipidots were analyzed quantitatively in serial samples of blood and tissue and with in vivo optical imaging and were refined by microscopic examination of selected target tissues. RESULTS The plasmatic half-life of lipidots was approximately 30 min. Radioactive and fluorescent tracers displayed a similar nanoparticle-driven biodistribution, indicative of the lipidots' integrity during the first hours after injection. Lipidots distributed in the liver and, surprisingly, in the steroid-rich organs adrenals and ovaries, but not in the spleen. This tropism was confirmed at the microscopic level by histologic detection of 1,1'-dioctadecyl-3,3,3',3'-tetramethylindotricarbocyanine. Nanoparticle loading with cholesterol derivatives increased accumulation in ovaries in a dose-dependent manner. CONCLUSION This previously unreported distribution pattern is specific to lipidots and attributed to their nanometric size and composition, conferring on them a lipoproteinlike behavior. The affinity of lipidots for steroid hormone-rich areas is of interest to address drugs and contrast agents to lipoprotein-receptor-overexpressing cancer cells found in hormone-dependent tumors.
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Hosten B, Boisgard R, Jacob A, Goutal S, Saubaméa B, Dollé F, Scherrmann JM, Cisternino S, Tournier N. [¹¹C]befloxatone brain kinetics is not influenced by Bcrp function at the blood-brain barrier: a PET study using Bcrp TGEM knockout rats. Eur J Pharm Sci 2013; 50:520-5. [PMID: 23981334 DOI: 10.1016/j.ejps.2013.08.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 07/18/2013] [Accepted: 08/10/2013] [Indexed: 12/22/2022]
Abstract
Knockout (KO) animals are useful tools with which to assess the interplay between P-glycoprotein (P-gp; Abcb1) and the breast cancer resistance protein (Bcrp, Abcg2), two major ABC-transporters expressed at the blood-brain barrier (BBB). However, one major drawback of such deficient models is the possible involvement of compensation between transporters. In the present study, P-gp and Bcrp distribution in the brain as well as P-gp expression levels at the BBB were compared between the Bcrp TGEM KO rat model and the wild-type (WT) strain. Therefore, we used confocal microscopy of brain slices and western blot analysis of the isolated brain microvessels forming the BBB. This deficient rat model was used to assess the influence of Bcrp on the brain and peripheral kinetics of its substrate [(11)C]befloxatone using positron emission tomography (PET). The influence of additional P-gp inhibition was tested using elacridar (GF120918) 2 mg/kg in Bcrp KO rats. The distribution pattern of P-gp in the brain as well as P-gp expression levels at the BBB was similar in Bcrp-deficient and WT rats. Brain and peripheral kinetics of [(11)C]befloxatone were not influenced by the lack of Bcrp. Neither was the brain uptake of [(11)C]befloxatone in Bcrp-deficient rats influenced by the inhibition of P-gp. In conclusion, the Bcrp-deficient rat strain, in which we detected no compensatory mechanism or modification of P-gp expression as compared to WT rats, is a suitable model to study Bcrp function separately from that of P-gp at the BBB. However, although selectively transported by BCRP in vitro, our results suggest that [(11)C]befloxatone PET imaging might not be biased by impaired function of this transporter in vivo.
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Affiliation(s)
- Benoit Hosten
- INSERM U705, CNRS UMR8206, Faculté de Pharmacie, Université Paris Descartes, Sorbonne Paris Cité, Université Paris Diderot, Paris F-75006, France
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Horodyckid C, Beccaria K, Canney M, Lafon C, Chapelon JY, Prigent A, Boisgard R, Merlet P, Carpentier A. Étude préclinique d’ouverture de la barrière hémato-encéphalique par un dispositif ultrasonore implantable (SonoCloud). Neurochirurgie 2012. [DOI: 10.1016/j.neuchi.2012.10.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Sarda-Mantel L, Alsac JM, Boisgard R, Hervatin F, Montravers F, Tavitian B, Michel JB, Le Guludec D. Comparison of 18F-fluoro-deoxy-glucose, 18F-fluoro-methyl-choline, and 18F-DPA714 for positron-emission tomography imaging of leukocyte accumulation in the aortic wall of experimental abdominal aneurysms. J Vasc Surg 2012; 56:765-73. [PMID: 22726755 DOI: 10.1016/j.jvs.2012.01.069] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Revised: 01/20/2012] [Accepted: 01/29/2012] [Indexed: 10/28/2022]
Abstract
OBJECTIVE Abdominal aortic aneurysm (AAA) is a frequent form of atherothrombotic disease, whose natural history is to enlarge and rupture. Indicators other than AAA diameter would be useful for preventive surgery decision-making, including positron-emission tomography (PET) methods permitting visualization of aortic wall leukocyte activation relevant to prognostic AAA evaluation. In this study, we compare three PET tracers of activated leukocytes, 18F-fluoro-deoxy-glucose (FDG), 18F-fluoro-methyl-choline (FCH), and 18F-DPA714 (a peripheral benzodiazepine receptor antagonist) for in vivo PET quantification of aortic wall inflammation in rat experimental AAAs, in correlation with histopathological studies of lesions. METHODS AAAs were induced by orthotopic implantation of decellularized guinea pig abdominal aorta in 46 Lewis rats. FDG-PET (n = 20), FCH-PET (n = 8), or both (n = 12) were performed 2 weeks to 4 months after the graft, 1 hour after tracer injection (30 MBq). Six rats (one of which had FDG-PET) underwent 18F-DPA714-PET. Rats were sacrificed after imaging; AAAs and normal thoracic aortas were cut into axial sections for quantitative autoradiography and histologic studies, including ED1 (macrophages) and CD8 T lymphocyte immunostaining. Ex vivo staining of AAAs and thoracic aortas with 18F-DPA714 and unlabeled competitors was performed. RESULTS AAAs developed in 35 out of 46 cases. FCH uptake in AAAs was lower than that of FDG in all cases on imaging, with lower AAA-to-background maximal standardized uptake value (SUV(max)) ratios (1.78 ± 0.40 vs 2.71 ± 0.54; P < .01 for SUV(max) ratios), and lower AAA-to-normal aorta activity ratios on autoradiography (3.52 ± 1.26 vs 8.55 ± 4.23; P < .005). FDG AAA-to-background SUV(max) ratios correlated with the intensity of CD8 + ED1 staining (r = .76; P < .03). FCH AAA-to-background SUV(max) ratios correlated with the intensity of ED1 staining (r = .80; P < .03). 18F-DPA714 uptake was similar in AAAs and in normal aortas, both in vivo and ex vivo. CONCLUSIONS In rat experimental AAA, characterized by an important aortic wall leukocytes activity, FDG-PET showed higher sensitivity than FCH-PET and 18F-DPA714-PET to detect activated leukocytes. This enhances potential interest of this tracer for prognostic evaluation of AAA in patients.
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Affiliation(s)
- Laure Sarda-Mantel
- Institut National de la Santé et de la Recherche Médicale Unit 698, Paris, France.
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Tong X, Garofalakis A, Dubois A, Boisgard R, Ducongé F, Trébossen R, Tavitian B. Co-registration of glucose metabolism with positron emission tomography and vascularity with fluorescent diffuse optical tomography in mouse tumors. EJNMMI Res 2012; 2:19. [PMID: 22564761 PMCID: PMC3506556 DOI: 10.1186/2191-219x-2-19] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Accepted: 02/24/2012] [Indexed: 11/10/2022] Open
Abstract
UNLABELLED BACKGROUND Bimodal molecular imaging with fluorescence diffuse optical tomography (fDOT) and positron emission tomography (PET) has the capacity to provide multiple molecular information of mouse tumors. The objective of the present study is to co-register fDOT and PET molecular images of tumors in mice automatically. METHODS The coordinates of bimodal fiducial markers (FM) in regions of detection were automatically detected in planar optical images (x, y positions) in laser pattern optical surface images (z position) and in 3-D PET images. A transformation matrix was calculated from the coordinates of the FM in fDOT and in PET and applied in order to co-register images of mice bearing neuroendocrine tumors. RESULTS The method yielded accurate non-supervised co-registration of fDOT and PET images. The mean fiducial registration error was smaller than the respective voxel sizes for both modalities, allowing comparison of the distribution of contrast agents from both modalities in mice. Combined imaging depicting tumor metabolism with PET-[18 F]2-deoxy-2-fluoro-d-glucose and blood pool with fDOT demonstrated partial overlap of the two signals. CONCLUSIONS This automatic method for co-registration of fDOT with PET and other modalities is efficient, simple and rapid, opening up multiplexing capacities for experimental in vivo molecular imaging.
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Affiliation(s)
- Xiao Tong
- CEA, Institut d'Imagerie Biomédicale (I2BM), Service Hospitalier Frédéric Joliot (SHFJ), Laboratoire d'Imagerie Moléculaire Expérimentale, 4 place du Général Leclerc, 91401, Orsay Cedex, France.
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Damont A, Boisgard R, Kuhnast B, Lemée F, Raggiri G, Scarf AM, Da Pozzo E, Selleri S, Martini C, Tavitian B, Kassiou M, Dollé F. Synthesis of 6-[¹⁸F]fluoro-PBR28, a novel radiotracer for imaging the TSPO 18 kDa with PET. Bioorg Med Chem Lett 2011; 21:4819-22. [PMID: 21741237 DOI: 10.1016/j.bmcl.2011.06.048] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2011] [Revised: 06/09/2011] [Accepted: 06/11/2011] [Indexed: 11/19/2022]
Abstract
6-Fluoro-PBR28 (N-(6-fluoro-4-phenoxypyridin-3-yl)-N-(2-methoxybenzyl)acetamide), a fluorinated analogue of the recently developed TSPO 18 kDa ligand PBR28, was synthesized and labelled with fluorine-18. 6-Fluoro-PBR28 and its 6-chloro/6-bromo counterparts were synthesized in six chemical steps and obtained in 16%, 10% and 19% overall yields, respectively. Labelling with fluorine-18 was performed in one single step (chlorine/bromine-for-fluorine heteroaromatic substitution) using a Zymate-XP robotic system affording HPLC-purified, ready-to-inject, 6-[(18)F]fluoro-PBR28 (>95% radiochemically pure). Non-decay-corrected overall yields were 9-10% and specific radioactivities ranged from 74 to 148 GBq/μmol. In vitro binding experiments, dynamic μPET studies performed in a rat model of acute neuroinflammation (unilaterally, AMPA-induced, striatum-lesioned rats) and ex vivo autoradiography on the same model demonstrated the potential of 6-[(18)F]fluoro-PBR28 to image the TSPO 18 kDa using PET.
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Martín A, Boisgard R, Kassiou M, Dollé F, Tavitian B. Reduced PBR/TSPO expression after minocycline treatment in a rat model of focal cerebral ischemia: a PET study using [(18)F]DPA-714. Mol Imaging Biol 2011; 13:10-5. [PMID: 20383592 DOI: 10.1007/s11307-010-0324-y] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Many new candidate pharmaceuticals designed to improve recovery after stroke have been proposed recently, but there are still too few molecular imaging methods capable to assess their efficacy. A hallmark of the inflammatory reaction that follows focal cerebral ischemia is overexpression of the mitochondrial peripheral benzodiazepine receptor/18 kDa translocator protein (PBR/TSPO) in the monocytic lineage and astrocytes. This overexpression can be imaged with positron emission tomography (PET) using PBR/TSPO-selective radioligands such as [(18)F]DPA-714. PURPOSE Here, we tested whether PET with [(18)F]DPA-714 would evidence the effect of minocycline, a broad spectrum antibiotic presently tested as neuroprotective agent after stroke, on the inflammatory reaction induced in an experimental model of stroke. PROCEDURES Ten rats were subjected to a 2-h transient middle cerebral artery occlusion with reperfusion. Minocycline or saline was intravenously administrated 1 h after reperfusion and daily during the following 6 days. PET studies were performed using [(18)F]DPA-714 at 7 days after cerebral ischemia. RESULTS In vivo PET imaging showed a significant decrease in [(18)F]DPA-714 uptake at 7 days after cerebral ischemia in rats treated with minocycline with respect to saline-treated animals. Minocycline treatment had no effect on the size of the infarcted area. CONCLUSION Minocycline administered daily during 7 days after ischemia decreases [(18)F]DPA-714 binding, suggesting that the drug exerts an anti-inflammatory activity. [(18)F]DPA-714 PET is a useful biomarker to study novel anti-inflammatory strategies in experimental cerebral ischemia.
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Affiliation(s)
- Abraham Martín
- CEA, DSV, I²BM, SHFJ, Laboratoire Imagerie Moléculaire Expérimentale, INSERM U803, 4 Place Géneral Leclerc, 91406 Orsay Cedex, France
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Zheng J, Boisgard R, Siquier-Pernet K, Decaudin D, Dollé F, Tavitian B. Differential Expression of the 18 kDa Translocator Protein (TSPO) by Neoplastic and Inflammatory Cells in Mouse Tumors of Breast Cancer. Mol Pharm 2011; 8:823-32. [DOI: 10.1021/mp100433c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jinzi Zheng
- Laboratoire d'Imagerie Moléculaire Expérimentale, Université Paris Sud, INSERM Unit 1023, 4 Place du Général Leclerc, F-91400 Orsay, France
| | - Raphaël Boisgard
- Laboratoire d'Imagerie Moléculaire Expérimentale, Université Paris Sud, INSERM Unit 1023, 4 Place du Général Leclerc, F-91400 Orsay, France
| | - Karine Siquier-Pernet
- Laboratoire d'Imagerie Moléculaire Expérimentale, Université Paris Sud, INSERM Unit 1023, 4 Place du Général Leclerc, F-91400 Orsay, France
| | - Didier Decaudin
- Laboratory of Preclinical Investigation, Institut Curie, 26 rue d'Ulm, F-75248 Paris, France
| | - Frédéric Dollé
- Institut d'Imagerie BioMédicale, Service Hospitalier Frédéric Joliot, Commissariat a l'Énergie Atomique, 4 Place du Général Leclerc, F-91400, France
| | - Bertrand Tavitian
- Laboratoire d'Imagerie Moléculaire Expérimentale, Université Paris Sud, INSERM Unit 1023, 4 Place du Général Leclerc, F-91400 Orsay, France
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Maisonial A, Kuhnast B, Papon J, Boisgard R, Bayle M, Vidal A, Auzeloux P, Rbah L, Bonnet-Duquennoy M, Miot-Noirault E, Galmier MJ, Borel M, Askienazy S, Dollé F, Tavitian B, Madelmont JC, Moins N, Chezal JM. Single photon emission computed tomography/positron emission tomography imaging and targeted radionuclide therapy of melanoma: new multimodal fluorinated and iodinated radiotracers. J Med Chem 2011; 54:2745-66. [PMID: 21417462 DOI: 10.1021/jm101574q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This study reports a series of 14 new iodinated and fluorinated compounds offering both early imaging ((123)I, (124)I, (18)F) and systemic treatment ((131)I) of melanoma potentialities. The biodistribution of each (125)I-labeled tracer was evaluated in a model of melanoma B16F0-bearing mice, using in vivo serial γ scintigraphic imaging. Among this series, [(125)I]56 emerged as the most promising compound in terms of specific tumoral uptake and in vivo kinetic profile. To validate our multimodality concept, the radiosynthesis of [(18)F]56 was then optimized and this radiotracer has been successfully investigated for in vivo PET imaging of melanoma in B16F0- and B16F10-bearing mouse model. The therapeutic efficacy of [(131)I]56 was then evaluated in mice bearing subcutaneous B16F0 melanoma, and a significant slow down in tumoral growth was demonstrated. These data support further development of 56 for PET imaging ((18)F, (124)I) and targeted radionuclide therapy ((131)I) of melanoma using a single chemical structure.
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Affiliation(s)
- Aurélie Maisonial
- Clermont Université, Université d'Auvergne, Imagerie Moléculaire et Thérapie Vectorisée, Clermont-Ferrand, France
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Thominiaux C, Damont A, Kuhnast B, Demphel S, Le Helleix S, Boisnard S, Rivron L, Chauveau F, Boutin H, Van Camp N, Boisgard R, Roy S, Allen J, Rooney T, Benavides J, Hantraye P, Tavitian B, Dollé F. Radiosynthesis of 7-chloro-N,N-dimethyl-5-[11C]methyl-4-oxo-3-phenyl-3,5-dihydro-4H-pyridazino[4,5-b]indole-1-acetamide, [11C]SSR180575, a novel radioligand for imaging the TSPO (peripheral benzodiazepine receptor) with PET. J Labelled Comp Radiopharm 2010. [DOI: 10.1002/jlcr.1794] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Maroy R, Boisgard R, Comtat C, Jego B, Fontyn Y, Jan S, Dubois A, Trébossen R, Tavitian B. Quantitative organ time activity curve extraction from rodent PET images without anatomical prior. Med Phys 2010; 37:1507-17. [PMID: 20443471 DOI: 10.1118/1.3327454] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Numerous new drug candidates fail because of inadequate pharmacokinetics. Positron emission tomography (PET) enables the noninvasive characterization of the drug in humans and animals. The aim of the present work was the comparison of methods for the extraction of organ time activity curves from rodent PET images without requiring resort to anatomical information. METHODS The rodent organs were segmented using the local means analysis method and the accuracy of the time activity curve (TAC) estimated using four methods was compared: The mean TAC (Mean), the TAC computed in a selection of organ voxels (ROIopt), and the TAC corrected for partial volume effect using the geometric transfer matrix (GTM) method. The accuracy of the TAC estimated using the three methods was compared on phantom simulations and on experimental data sets on mice injected with fluorothymidine. RESULTS The segmentation quality measured on phantom simulation was 80% of overlap between segmented and gold standard organs. On the phantom simulations, the error on the TAC estimation on phantom simulations was lower for ROIopt (8%) than using the GTM (18%) and the Mean (27%) methods. Similar results were achieved on the experimental data sets: ROIopt (5.8%), GTM (9.7%), and Mean (12%). CONCLUSIONS The new ROI optimization method was fast and precise for all homogeneous organs, while mean organ TAC computation led as expected to important errors. GTM improved the quantification accuracy but showed instabilities due to segmentation errors and to small organ sizes. Partial volume effect correction or limitation is thus possible for the extraction of precise organ TACs without requiring either manual delineation or an anatomical modality.
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Affiliation(s)
- R Maroy
- Commissariat à l'Energie Atomique, Service Hospitalier Frédéric Joliot, 91401 Orsay, France.
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Martín A, Boisgard R, Thézé B, Van Camp N, Kuhnast B, Damont A, Kassiou M, Dollé F, Tavitian B. Evaluation of the PBR/TSPO radioligand [(18)F]DPA-714 in a rat model of focal cerebral ischemia. J Cereb Blood Flow Metab 2010; 30:230-41. [PMID: 19794397 PMCID: PMC2949091 DOI: 10.1038/jcbfm.2009.205] [Citation(s) in RCA: 147] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2009] [Revised: 09/02/2009] [Accepted: 09/06/2009] [Indexed: 12/23/2022]
Abstract
Focal cerebral ischemia leads to an inflammatory reaction involving an overexpression of the peripheral benzodiazepine receptor (PBR)/18-kDa translocator protein (TSPO) in the cerebral monocytic lineage (microglia and monocyte) and in astrocytes. Imaging of PBR/TSPO by positron emission tomography (PET) using radiolabeled ligands can document inflammatory processes induced by cerebral ischemia. We performed in vivo PET imaging with [(18)F]DPA-714 to determine the time course of PBR/TSPO expression over several days after induction of cerebral ischemia in rats. In vivo PET imaging showed significant increase in DPA (N,N-diethyl-2-(2-(4-(2-fluoroethoxy)phenyl)-5,7-dimethylpyrazolo[1,5-a]pyrimidin-3-yl)acetamide) uptake on the injured side compared with that in the contralateral area on days 7, 11, 15, and 21 after ischemia; the maximal binding value was reached 11 days after ischemia. In vitro autoradiography confirmed these in vivo results. In vivo and in vitro [(18)F]DPA-714 binding was displaced from the lesion by PK11195 and DPA-714. Immunohistochemistry showed increased PBR/TSPO expression, peaking at day 11 in cells expressing microglia/macrophage antigens in the ischemic area. At later times, a centripetal migration of astrocytes toward the lesion was observed, promoting the formation of an astrocytic scar. These results show that [(18)F]DPA-714 provides accurate quantitative information of the time course of PBR/TSPO expression in experimental stroke.
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Affiliation(s)
- Abraham Martín
- INSERM U803, Orsay, France
- CEA, DSV, FBM, SHFJ, Laboratoire Imagerie Moléculaire Expérimentale, Orsay, France
| | - Raphaël Boisgard
- INSERM U803, Orsay, France
- CEA, DSV, FBM, SHFJ, Laboratoire Imagerie Moléculaire Expérimentale, Orsay, France
| | - Benoit Thézé
- INSERM U803, Orsay, France
- CEA, DSV, FBM, SHFJ, Laboratoire Imagerie Moléculaire Expérimentale, Orsay, France
| | - Nadja Van Camp
- INSERM U803, Orsay, France
- CEA, DSV, FBM, SHFJ, Laboratoire Imagerie Moléculaire Expérimentale, Orsay, France
| | - Bertrand Kuhnast
- CEA, DSV, FBM, SHFJ, Laboratoire Imagerie Moléculaire Expérimentale, Orsay, France
| | - Annelaure Damont
- CEA, DSV, FBM, SHFJ, Laboratoire Imagerie Moléculaire Expérimentale, Orsay, France
| | - Michael Kassiou
- University of Sydney, Sydney, New South Wales, Australia
- Discipline of Medical Radiation Sciences, University of Sydney, Sydney, New South Wales, Australia
- School of Chemistry, University of Sydney, Sydney, New South Wales, Australia
| | - Frédéric Dollé
- CEA, DSV, FBM, SHFJ, Laboratoire Imagerie Moléculaire Expérimentale, Orsay, France
| | - Bertrand Tavitian
- INSERM U803, Orsay, France
- CEA, DSV, FBM, SHFJ, Laboratoire Imagerie Moléculaire Expérimentale, Orsay, France
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Abstract
Inflammatory responses are closely associated with many neurologic disorders and influence their outcome. In vivo imaging can document events accompanying neuroinflammation, such as changes in blood flow, vascular permeability, tightness of the blood-to-brain barrier, local metabolic activity, and expression of specific molecular targets. Here, we briefly review current methods for imaging neuroinflammation, with special emphasis on nuclear imaging techniques.
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Affiliation(s)
- Alexandra Winkeler
- CEA, I(2)BM, Service Hospitalier Frédéric Joliot, LIME, INSERM U803, 91400 Orsay, France
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Abstract
In this chapter we present the methods developed in our laboratory for in vivo imaging of oligonucleotidic aptamers. These methods relate to (i) the labelling of aptamers with fluorine-18, a positron emitter, (ii) Positron Emission Tomography imaging of laboratory animals with [(18)F]aptamers and (iii) labelling with fluorescent dyes and optical imaging of aptamers in mice.
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Affiliation(s)
- Bertrand Tavitian
- Laboratoire d Imagerie Moléculaire Expérimentale, Service hospitalier Frédéric joliot, Intitut d Imagerie Biomédicale, Orsay, France
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Hervé J, Cunha AS, Liu B, Valogne Y, Longuet M, Boisgard R, Brégerie O, Roux J, Guettier C, Calès P, Tavitian B, Samuel D, Clerc J, Bréchot C, Faivre J. Internal radiotherapy of liver cancer with rat hepatocarcinoma-intestine-pancreas gene as a liver tumor-specific promoter. Hum Gene Ther 2008; 19:915-26. [PMID: 18759560 DOI: 10.1089/hum.2007.153] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The hepatocarcinoma-intestine-pancreas (HIP) gene, also called pancreatitis-associated protein-1 (PAP1) or Reg IIIalpha, is activated in most human hepatocellular carcinomas (HCCs) but not in normal liver, which suggests that HIP regulatory sequence could be used as efficient liver tumor-specific promoters to express a therapeutic polynucleotide in liver cancer. The sodium iodide symporter (NIS), which has recognized therapeutic and reporter gene properties, is appropriate to evaluate the transcriptional strength and specificity of the HIP promoter in HCC. For this purpose, we constructed a recombinant rat HIP-NIS adenoviral vector (AdrHIP-NIS), and evaluated its performance as a mediator of selective radioiodide uptake in tumor hepatocytes. Western blot, immunofluorescence, and iodide uptake assays were performed in AdrHIP-NIS-infected primary hepatocytes and transformed hepatic and nonhepatic cells. Nuclear imaging, tissue counting and immunohistochemistry were performed in normal and HCC-bearing Wistar rats infected with AdrHIP-NIS intratumorally or via the hepatic artery. In AdrHIP-NIS-infected transformed hepatic cells, functional NIS was strongly expressed, as in cells infected with a cytomegalovirus-NIS vector. No NIS expression was found in AdrHIP-NIS-infected normal hepatocytes or transformed nonhepatic cells. In rats bearing multinodular HCC, AdrHIP-NIS triggered functional NIS expression that was preferential in tumor hepatocytes. Administration of 18 mCi of (131)I resulted in the destruction of AdrHIP-NIS-injected nodules. This study has identified the rHIP regulatory sequence as a potent liver tumor-specific promoter for the transfer of therapeutic genes, and AdrHIP-NIS-mediated (131)I therapy as a valuable option for the treatment of multinodular HCC.
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Affiliation(s)
- Julie Hervé
- INSERM U785, Centre Hépatobiliaire, Villejuif F-94800, France
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Maroy R, Boisgard R, Comtat C, Frouin V, Cathier P, Duchesnay E, Dollé F, Nielsen PE, Trébossen R, Tavitian B. Segmentation of rodent whole-body dynamic PET images: an unsupervised method based on voxel dynamics. IEEE Trans Med Imaging 2008; 27:342-354. [PMID: 18334430 DOI: 10.1109/tmi.2007.905106] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Positron emission tomography (PET) is a useful tool for pharmacokinetics studies in rodents during the preclinical phase of drug and tracer development. However, rodent organs are small as compared to the scanner's intrinsic resolution and are affected by physiological movements. We present a new method for the segmentation of rodent whole-body PET images that takes these two difficulties into account by estimating the pharmacokinetics far from organ borders. The segmentation method proved efficient on whole-body numerical rat phantom simulations, including 3-14 organs, together with physiological movements (heart beating, breathing, and bladder filling). The method was resistant to spillover and physiological movements, while other methods failed to obtain a correct segmentation. The radioactivity concentrations calculated with this method also showed an excellent correlation with the manual delineation of organs in a large set of preclinical images. In addition, it was faster, detected more organs, and extracted organs' mean time activity curves with a better confidence on the measure than manual delineation.
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Rogers KL, Picaud S, Roncali E, Boisgard R, Colasante C, Stinnakre J, Tavitian B, Brûlet P. Non-invasive in vivo imaging of calcium signaling in mice. PLoS One 2007; 2:e974. [PMID: 17912353 PMCID: PMC1991622 DOI: 10.1371/journal.pone.0000974] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2007] [Accepted: 09/05/2007] [Indexed: 11/19/2022] Open
Abstract
Rapid and transient elevations of Ca(2+) within cellular microdomains play a critical role in the regulation of many signal transduction pathways. Described here is a genetic approach for non-invasive detection of localized Ca(2+) concentration ([Ca(2+)]) rises in live animals using bioluminescence imaging (BLI). Transgenic mice conditionally expressing the Ca(2+)-sensitive bioluminescent reporter GFP-aequorin targeted to the mitochondrial matrix were studied in several experimental paradigms. Rapid [Ca(2+)] rises inside the mitochondrial matrix could be readily detected during single-twitch muscle contractions. Whole body patterns of [Ca(2+)] were monitored in freely moving mice and during epileptic seizures. Furthermore, variations in mitochondrial [Ca(2+)] correlated to behavioral components of the sleep/wake cycle were observed during prolonged whole body recordings of newborn mice. This non-invasive imaging technique opens new avenues for the analysis of Ca(2+) signaling whenever whole body information in freely moving animals is desired, in particular during behavioral and developmental studies.
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Affiliation(s)
- Kelly L. Rogers
- Unité d'Embryologie Moléculaire, CNRS URA 2578, Institut Pasteur, Paris, France
- CEA, Service Hospitalier Frédéric Joliot, Inserm, U 803, Imagerie de l'expression des gènes, Orsay, France
| | - Sandrine Picaud
- Unité d'Embryologie Moléculaire, CNRS URA 2578, Institut Pasteur, Paris, France
| | - Emilie Roncali
- CEA, Service Hospitalier Frédéric Joliot, Inserm, U 803, Imagerie de l'expression des gènes, Orsay, France
| | - Raphaël Boisgard
- CEA, Service Hospitalier Frédéric Joliot, Inserm, U 803, Imagerie de l'expression des gènes, Orsay, France
| | - Cesare Colasante
- Unité d'Embryologie Moléculaire, CNRS URA 2578, Institut Pasteur, Paris, France
| | - Jacques Stinnakre
- Unité d'Embryologie Moléculaire, CNRS URA 2578, Institut Pasteur, Paris, France
| | - Bertrand Tavitian
- CEA, Service Hospitalier Frédéric Joliot, Inserm, U 803, Imagerie de l'expression des gènes, Orsay, France
| | - Philippe Brûlet
- Unité d'Embryologie Moléculaire, CNRS URA 2578, Institut Pasteur, Paris, France
- * To whom correspondence should be addressed. E-mail:
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Idbaih A, Burlet A, Adle-Biassette H, Boisgard R, Coulon C, Paris S, Marie Y, Donadieu J, Hoang-Xuan K, Ribeiro MJ. Altered cerebral glucose metabolism in an animal model of diabetes insipidus: A micro-PET study. Brain Res 2007; 1158:164-8. [PMID: 17559814 DOI: 10.1016/j.brainres.2007.05.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2007] [Revised: 05/04/2007] [Accepted: 05/04/2007] [Indexed: 11/23/2022]
Abstract
The Brattleboro rat is an animal model of genetically induced central diabetes insipidus. These rats show cognitive and behavioral disorders, but no neurodegenerative disease has been observed. We studied brain glucose uptake, a marker of neuronal activity, in 6 Brattleboro rats, in comparison with 6 matched Long-Evans (LE) control rats. A group of 3 Brattleboro rats and 3 Long-Evans rats was studied in vivo and another group of animals was studied ex vivo. In vivo studies were performed using fluorodeoxyglucose labeled with fluorine 18 ((18)F-FDG) and a dedicated small-animal PET device. At 30 min and 60 min p.i., (18)F-FDG uptake was significantly higher in the frontal cortex, striatum, thalamus and cerebellum of Brattleboro rats than in LE rats when measured by PET in vivo (p<0.05), but only a trend towards higher values was found ex vivo. Our results show for the first time that brain glucose metabolism is modified in Brattleboro rats. This altered brain glucose metabolism in Brattleboro rats may be related to the observed cognitive and behavioral disorders. Functional analyses of brain metabolism are promising to investigate cognitive behavioral disturbances observed in Brattleboro rats and their link to diabetes insipidus.
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Affiliation(s)
- Ahmed Idbaih
- AP-HP, Groupe hospitalier Pitié-Salpêtrière, Service de neurologie Mazarin, Paris, France
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Liu B, Hervé J, Bioulac-Sage P, Valogne Y, Roux J, Yilmaz F, Boisgard R, Guettier C, Calès P, Tavitian B, Samuel D, Clerc J, Bréchot C, Faivre J. Sodium iodide symporter is expressed at the preneoplastic stages of liver carcinogenesis and in human cholangiocarcinoma. Gastroenterology 2007; 132:1495-503. [PMID: 17408651 DOI: 10.1053/j.gastro.2007.01.044] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2006] [Accepted: 12/14/2006] [Indexed: 12/31/2022]
Abstract
BACKGROUND & AIMS The ability of thyroid cells to take up iodide, which enables (131)I radiotherapy for thyroid cancer, is due to the expression of the sodium iodide symporter at their plasma membrane. Expression of this symporter has been found in some nonthyroid cancers. However, it is mostly accumulated in the cytoplasm, and its functionality has not been demonstrated. We have investigated sodium iodide symporter expression and functionality in human liver cancer, and in a diethylnitrosamine induced Wistar rat model of primary liver cancer at different stages of carcinogenesis. METHODS Sodium iodide symporter mRNA and protein were studied in tissues from patients with hepatocellular- or cholangio-carcinomas using reverse-transcription polymerase chain reaction, immunoblot, and immunohistochemistry. We studied the dynamics of hepatic iodine uptake in the animal model using nuclear imaging. RESULTS Sodium iodide symporter expression showed up in all 20 cholangiocarcinomas, but in only 2 of the 26 hepatocellular carcinomas, investigated. It was also found in normal bile duct cells and in the ductular reaction present in cirrhotic tissues. It was located at the plasma membrane in 10 of 20 cholangiocarcinoma. In rat liver cancer, a functional sodium iodide symporter expression was triggered as from the early preneoplastic steps, and was amplified during clonal tumor cell expansion, allowing complete tumor suppression after (131)I radiotherapy. CONCLUSIONS A significant proportion of human cholangiocarcinomas expresses membrane sodium iodide symporter, which may permit radioiodine therapy. Our data also suggest that (131)I acts on a crucial target for liver cancer development.
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MESH Headings
- Animals
- Autoradiography
- Bile Duct Neoplasms/diagnosis
- Bile Duct Neoplasms/genetics
- Bile Duct Neoplasms/metabolism
- Bile Ducts, Intrahepatic
- Carcinoma, Hepatocellular/diagnosis
- Carcinoma, Hepatocellular/genetics
- Carcinoma, Hepatocellular/metabolism
- Cholangiocarcinoma/diagnosis
- Cholangiocarcinoma/genetics
- Cholangiocarcinoma/metabolism
- Disease Progression
- Gene Expression Regulation, Neoplastic
- Humans
- Immunoblotting
- Immunohistochemistry
- In Situ Nick-End Labeling
- Iodine
- Liver Neoplasms/diagnosis
- Liver Neoplasms/genetics
- Liver Neoplasms/metabolism
- Liver Neoplasms, Experimental/diagnosis
- Liver Neoplasms, Experimental/genetics
- Liver Neoplasms, Experimental/metabolism
- Male
- RNA, Messenger/genetics
- Rats
- Rats, Wistar
- Reverse Transcriptase Polymerase Chain Reaction
- Symporters/biosynthesis
- Symporters/genetics
- Tomography, Emission-Computed, Single-Photon
- Tomography, X-Ray Computed
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Affiliation(s)
- Bingkai Liu
- INSERM, U785, Centre Hépatobiliaire, Villejuif, France; Université Paris-Sud, Faculté de médecine, Villejuif, France
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Viel T, Kuhnast B, Hinnen F, Boisgard R, Tavitian B, Dollé F. Fluorine-18 labelling of small interfering RNAs (siRNAs) for PET imaging. J Labelled Comp Radiopharm 2007. [DOI: 10.1002/jlcr.1411] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Jai C, Aimé JP, Mariolle D, Boisgard R, Bertin F. Wetting an oscillating nanoneedle to image an air-liquid interface at the nanometer scale: dynamical behavior of a nanomeniscus. Nano Lett 2006; 6:2554-60. [PMID: 17090090 DOI: 10.1021/nl0619599] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The dynamical behavior of a nanomeniscus is investigated with a oscillating nanoneedle recording information on the change of the shape and viscous contribution. At the air-glycerol interface, the dynamical properties exhibit a nonlinear behavior making the nanomeniscus evolution similar to a first-order phase transition. Also shown is the capability to record height images of the liquid interface with resolutions at nanometer scale. At the air-water interface, evaporation leads to more complex dynamical properties. The viscous damping first increases as a consequence of a thinning effect, then, when the contact angle reaches zero, the nanomeniscus is unable to sustain the dissipation.
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Affiliation(s)
- C Jai
- CPMOH, Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence, France
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Janssen KP, Vignjevic D, Boisgard R, Falguières T, Bousquet G, Decaudin D, Dollé F, Louvard D, Tavitian B, Robine S, Johannes L. In vivo tumor targeting using a novel intestinal pathogen-based delivery approach. Cancer Res 2006; 66:7230-6. [PMID: 16849571 DOI: 10.1158/0008-5472.can-06-0631] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Efficient methods for tumor targeting are eagerly awaited and must satisfy several challenges: molecular specificity, transport through physiologic barriers, and capacity to withstand extracellular or intracellular degradation and inactivation by the immune system. Through interaction with its hosts, the intestinal pathogen-produced Shiga toxin has evolved molecular properties that are of interest in this context. Its nontoxic B-subunit binds to the cellular toxin receptor, glycosphingolipid Gb3, which is highly expressed on human cancers and has recently been reported to be involved in the formation of metastasis in colorectal cancers. Its function as a target for cancer therapy has already been addressed in xenograft experiments. We here show that after oral or i.v. injections in mice, the B-subunit targets spontaneous digestive Gb3-expressing adenocarcinomas. The nontumoral mucosa is devoid of labeling, with the exception of rare enteroendocrine and CD11b-positive cells. As opposed to other delivery tools that are often degraded or recycled on cancer cells, the B-subunit stably associates with these cells due to its trafficking via the retrograde transport route. This can be exploited for the in vivo delivery of contrast agents to tumors, as exemplified using fibered confocal fluorescence endoscopy and positron emission tomography (PET) imaging. In conclusion, the data presented in this manuscript lay the groundwork for a novel delivery technology that, in addition to its use for molecular imaging applications such as noninvasive PET, could also be exploited for targeted tumor therapies.
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Affiliation(s)
- Klaus-Peter Janssen
- UMR144 Curie/Centre National de la Recherche Scientifique, Institut Curie, Paris, France
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Josserand V, Pélerin H, de Bruin B, Jego B, Kuhnast B, Hinnen F, Ducongé F, Boisgard R, Beuvon F, Chassoux F, Daumas-Duport C, Ezan E, Dollé F, Mabondzo A, Tavitian B. Evaluation of Drug Penetration into the Brain: A Double Study by in Vivo Imaging with Positron Emission Tomography and Using an in Vitro Model of the Human Blood-Brain Barrier. J Pharmacol Exp Ther 2005; 316:79-86. [PMID: 16210395 DOI: 10.1124/jpet.105.089102] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The blood-brain barrier (BBB) permeabilities of 11 compounds were measured both in vitro with a newly developed coculture-based model of human BBB and in vivo with positron emission tomography (PET). The 11 compounds were fluoropyridinyl derivatives labeled with the positron-emitter fluorine-18, [(18)F]F-A-85380 [2-[(18)F]fluoro-3-[2(S)-2 azetidinylmethoxy]pyridine], and 10 selected N-substituted-azetidinyl and pyrrolidinyl closely related [(18)F]fluoropyridinyl derivatives (including [N'-aromatic/aliphatic]-thioureas, -ureas, and -amides). The in vitro BBB model, a new coculture system of primary human brain endothelial cells and astrocytes, was used to measure the permeability coefficient for each compound. Dynamic PET studies were performed in rats with the same compounds, and a two-compartment model analysis was used to calculate their in vivo permeability coefficients. The 11 derivatives differed in their degree of BBB passage and transport mechanism. The analysis of PET data showed a significant cerebral uptake for six derivatives, for which the in vitro evaluation indicated active influx or free diffusion. Five derivatives displayed low in vivo cerebral uptake, in agreement with the observation of an in vitro active efflux. Overall, there was a remarkable correlation between the in vitro and in vivo permeability coefficients (r = 0.99). This double study proves a close correlationship between the assessment of the BBB passage in vitro and in vivo. The in vitro model of human BBB offers the possibility of subtle discrimination of various BBB permeability degrees and transport mechanisms. Conversely, small animal PET imaging appears suitable to screen directly in vivo brain targeting of drugs or radiopharmaceutical candidates.
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Affiliation(s)
- Véronique Josserand
- Commissariat à l'Energie Atomique, Service Hospitalier Frédéric Joliot, Orsay, France
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de Bruin B, Kuhnast B, Hinnen F, Yaouancq L, Amessou M, Johannes L, Samson A, Boisgard R, Tavitian B, Dollé F. 1-[3-(2-[18F]fluoropyridin-3-yloxy)propyl]pyrrole-2,5-dione: design, synthesis, and radiosynthesis of a new [18F]fluoropyridine-based maleimide reagent for the labeling of peptides and proteins. Bioconjug Chem 2005; 16:406-20. [PMID: 15769096 DOI: 10.1021/bc0497463] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
FPyME (1-[3-(2-fluoropyridin-3-yloxy)propyl]pyrrole-2,5-dione) was designed as a [(18)F]fluoropyridine-based maleimide reagent for the prosthetic labeling of peptides and proteins via selective conjugation with a thiol (sulfhydryl) function. Its pyridinyl moiety carries the radioactive halogen (fluorine-18) which can be efficiently incorporated via a nucleophilic heteroaromatic substitution, and its maleimido function ensures the efficient alkylation of a free thiol function as borne by cysteine residues. [(18)F]FPyME (HPLC-purified) was prepared in 17-20% non-decay-corrected yield, based on starting [(18)F]fluoride, in 110 min using a three-step radiochemical pathway. The developed procedure involves (1) a high-yield nucleophilic heteroaromatic ortho-radiofluorination on [3-(3-tert-butoxycarbonylaminopropoxy)pyridin-2-yl]trimethylammonium trifluoromethanesulfonate as the fluorine-18 incorporation step, followed by (2) rapid and quantitative TFA-induced removal of the N-Boc-protective group and (3) optimized maleimide formation using N-methoxycarbonylmaleimide. Typically, 4.8-6.7 GBq (130-180 mCi) of radiochemically pure [(18)F]FPyME ([(18)F]-1) could be obtained after semipreparative HPLC in 110 min starting from a cyclotron production batch of 33.3 GBq (900 mCi) of [(18)F]fluoride (overall radiochemical yields, based on starting [(18)F]fluoride: 28-37% decay-corrected). [(18)F]FPyME ([(18)F]-1) was first conjugated with a small model hexapeptide ((N-Ac)KAAAAC), confirming the excellent chemoselectivity of the coupling reaction (CH(2)SH versus CH(2)NH(2)) and then conjugated with two 8-kDa proteins of interest, currently being developed as tumor imaging agents (c-AFIM-0 and c-STxB). Conjugation was achieved in high yields (60-70%, isolated and non-decay-corrected) and used optimized, short-time reaction conditions (a 1/9 (v/v) mixture of DMSO and 0.05 M aq Tris NaCl buffer (pH 7.4) or 0.1 M aq PBS (pH 8), at room temperature for 10 min) and purification conditions (a gel filtration using a Sephadex NAP-10 cartridge or a SuperDex Peptide HR 10/30 column), both compatible with the chemical stability of the proteins and the relatively short half-life of the radioisotope concerned. The whole radiosynthetic procedure, including the preparation of the fluorine-18-labeled reagent, the conjugation with the protein and the final purification took 130-140 min. [(18)F]FPyME ([(18)F]-1) represents a new, valuable, thiol-selective, fluorine-18-labeled reagent for the prosthetic labeling with fluorine-18 of peptides and proteins. Because of its excellent chemoselectivity, [(18)F]FPyME offers an interesting alternative to the use of the nonselective carboxylate and amine-reactive [(18)F]reagents and can therefore advantageously be used for the design and development of new peptide- and protein-based radiopharmaceuticals for PET.
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Affiliation(s)
- Béatrice de Bruin
- Service Hospitalier Frédéric Joliot, Département de Recherche Médicale, CEA/DSV, 4 place du Général Leclerc, F-91401 Orsay, France
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Péchoux C, Boisgard R, Chanat E, Lavialle F. Ca(2+)-independent phospholipase A2 participates in the vesicular transport of milk proteins. Biochim Biophys Acta 2005; 1743:317-29. [PMID: 15843044 DOI: 10.1016/j.bbamcr.2005.01.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2004] [Revised: 01/12/2005] [Accepted: 01/13/2005] [Indexed: 11/16/2022]
Abstract
Changes in the lipid composition of intracellular membranes are believed to take part in the molecular processes that sustain traffic between organelles of the endocytic and exocytic transport pathways. Here, we investigated the participation of the calcium-independent phospholipase A2 in the secretory pathway of mammary epithelial cells. Treatment with bromoenol lactone, a suicide substrate which interferes with the production of lysophospholipids by the calcium-independent phospholipase A2, resulted in the reduction of milk proteins secretion. The inhibitor slowed down transport of the caseins from the endoplasmic reticulum to the Golgi apparatus and affected the distribution of p58 and p23, indicating that the optimal process of transport of these proteins between the endoplasmic reticulum, the endoplasmic reticulum/Golgi intermediate compartment and/or the cis-side of the Golgi was dependent upon the production of lysolipids. Moreover, bromoenol lactone was found to delay the rate of protein transport from the trans-Golgi network to the plasma membrane. Concomitantly, membrane-bound structures containing casein accumulated in the juxtanuclear Golgi region. We concluded from these results that efficient formation of post-Golgi carriers also requires the phospholipase activity. These data further support the participation of calcium-independent phospholipase A2 in membrane trafficking and shed a new light on the tubulo/vesicular transport of milk protein through the secretory pathway.
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Affiliation(s)
- Christine Péchoux
- Institut National de la Recherche Agronomique, Laboratoire de Génomique et Physiologie de la Lactation. F-78352 Jouy-en-Josas Cedex, France
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Boisgard R, Kuhnast B, Vonhoff S, Younes C, Hinnen F, Verbavatz JM, Rousseau B, Fürste JP, Wlotzka B, Dollé F, Klussmann S, Tavitian B. In vivo biodistribution and pharmacokinetics of 18F-labelled Spiegelmers: a new class of oligonucleotidic radiopharmaceuticals. Eur J Nucl Med Mol Imaging 2004; 32:470-7. [PMID: 15614506 DOI: 10.1007/s00259-004-1669-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2004] [Accepted: 07/28/2004] [Indexed: 11/25/2022]
Abstract
PURPOSE Single-stranded mirror-image oligonucleotides (Spiegelmers) are highly resistant to nuclease degradation and are capable of tightly and specifically binding to protein targets. Here we explored the potential of Spiegelmers as in vivo imaging probes for positron emission tomography (PET). METHODS We investigated the biodistribution and pharmacokinetics of [18F]-L-DNA and [18F]-L-RNA Spiegelmers by dynamic quantitative whole-body PET imaging after intravenous administration in non-human primates. Their metabolic profile was explored in primates and rats, and ex vivo autoradiography of [(125)I]-L-RNA was performed in rat kidneys, the major organ for Spiegelmer uptake. RESULTS Both [18F]-L-DNA and [18F]-L-RNA Spiegelmers were metabolically stable in plasma during 2 h after injection. No evidence of non-specific binding was found with either type of Spiegelmer in any tissue. CONCLUSION The biodistribution and metabolic profiles of [18F]-L-DNA and [18F]-L-RNA Spiegelmers highlight their potential as radiotracers for in vivo imaging applications.
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Affiliation(s)
- Raphaël Boisgard
- Laboratoire d'Imagerie de l'Expression des Gènes, CEA, Service Hospitalier Frédéric Joliot, INSERM ERM 103, Orsay, France
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Kuhnast B, Hinnen F, Hamzavi R, Boisgard R, Tavitian B, Nielsen PE, Dollé F. Fluorine-18 labelling of PNAs functionalized at their pseudo-peptidic backbone for imaging studies with PET. J Labelled Comp Radiopharm 2004. [DOI: 10.1002/jlcr.895] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kuhnast B, Klussmann S, Hinnen F, Boisgard R, Rousseau B, Fürste JP, Tavitian B, Dollé F. Fluorine-18- and iodine-125-labelling of spiegelmers. J Labelled Comp Radiopharm 2003. [DOI: 10.1002/jlcr.781] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Kuhnast B, Hinnen F, Boisgard R, Tavitian B, Dollé F. Fluorine-18 labelling of oligonucleotides: Prosthetic labelling at the 5′-end using theN-(4-[18F]fluorobenzyl)-2-bromoacetamide reagent. J Labelled Comp Radiopharm 2003. [DOI: 10.1002/jlcr.742] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Boisgard R, Vincent-Naulleau S, Leplat JJ, Bouet S, Le Chalony C, Tricaud Y, Horak V, Geffrotin C, Frelat G, Tavitian B. A new animal model for the imaging of melanoma: correlation of FDG PET with clinical outcome, macroscopic aspect and histological classification in Melanoblastoma-bearing Libechov Minipigs. Eur J Nucl Med Mol Imaging 2003; 30:826-34. [PMID: 12682788 DOI: 10.1007/s00259-003-1152-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2002] [Accepted: 01/31/2003] [Indexed: 11/24/2022]
Abstract
The aim of this study was to evaluate the Melanoblastoma-bearing Libechov Minipigs (MeLiM) as an animal model of melanoma for in vivo imaging. Serial whole-body 2-deoxy-2-[(18)F]fluoro- d-glucose positron emission tomography (FDG PET) scans were conducted on five MeLiM. In order to explore different clinical stages of the tumoural lesions, each animal was scanned two to four times, at intervals of 30-155 days. PET images were analysed by a semiquantitative method based on the tumour to muscle metabolic ratio. Histology was performed on biopsies taken between or after the scans and the histological grading of the tumours was compared with the FDG uptake. The overall sensitivity of FDG PET for the detection of cutaneous melanoma was 75%; 62.5% of involved lymph nodes were positive. Sensitivity was better for tumours with vertical growth than for flat lesions. FDG PET did not detect tumours with epidermal involvement only, nor did it detect small metastatic foci. The metabolic ratio was correlated with the evolution of the melanoma. FDG PET is effective in the staging of cutaneous melanoma and the follow-up of tumoural extension and regression in Melanoblastoma-bearing Libechov Minipigs. The results obtained in this animal model correlate well with those described in human melanoma. Accordingly, this model may be useful in testing new tracers specific for melanoma and in helping to detect molecules expressed early during tumoural regression.
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Affiliation(s)
- Raphaël Boisgard
- Laboratoire d'imagerie de l'expression des gènes, CEA, Service hospitalier Frédéric Joliot, INSERM 0103, Orsay, France
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