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Cirulli N, Pascoletti L, Ghezzi C, Viganò V. Nuovo dispositivo ortodontico per la gestione mini invasiva delle carie interprossimali. Dental Cadmos 2022. [DOI: 10.19256/d.cadmos.2021.49] [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: 11/20/2022]
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2
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Morel Z, Suarez R, Avalos E, Velázquez S, Martínez F, Lezcano V, Astigarraga N, Ghezzi C, Brizuela S, Samudio G. Multisystemic inflammatory syndrome related to COVID-19, with latent tuberculosis in bone marrow, and satisfactory response to tocilizumab, in a 7-year-old boy. Reumatismo 2022; 73. [DOI: 10.4081/reumatismo.2021.1448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Accepted: 11/11/2021] [Indexed: 11/23/2022] Open
Abstract
Paediatric inflammatory multisystem syndrome temporally associated with COVID-19 (PIMS-TS) or multisystem inflammatory syndrome in children (MIS-C) is a new acute-onset systemic inflammatory disease, which mainly affects children. Latent tuberculosis infection (LTBI) is characterized by the presence of immune sensitization to Mycobacterium tuberculosis (MTB) in the absence of any clinical or radiological evidence of active disease. We present a child with MIS-C related to COVID-19, with latent TB in the bone marrow, and satisfactory response to tocilizumab. It is important to pay attention in the investigation of TB cases in countries with a high prevalence of tuberculosis, especially when opting for immunusuppression.
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Canu M, Jankowski A, Salvat M, Augier C, Casset C, Maurin M, Vanzetto G, Djaileb L, Riou L, Fagret D, Ghezzi C, Barone Rochette G. Coronary atherosclerotic burden in non-ischemic dilated cardiomyopathies: Prognostic implications. A sub study of 3 C registry. Archives of Cardiovascular Diseases Supplements 2021. [DOI: 10.1016/j.acvdsp.2021.04.042] [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: 11/16/2022]
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4
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Jabeur M, Djaileb L, Jacon P, Venier S, Carabelli A, Canu M, Riou L, Fagret D, Ghezzi C, Defaye P, Barone-Rochette G. Is entropy evaluated by SPECT a predictor of life-threatening ventricular arrhythmia in ischemic cardiomyopathy? Archives of Cardiovascular Diseases Supplements 2021. [DOI: 10.1016/j.acvdsp.2020.10.223] [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: 11/30/2022]
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5
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Djaileb L, Seiller A, Canu M, De Leiris N, Martin A, Leehardt J, Carabelli A, Calizzano A, Broisat A, Desvignes M, Vanzetto G, Ghezzi C, Fagret D, Riou L, Barone-Rochette G. Prognostic value of SPECT myocardial perfusion entropy in high-risk type 2 diabetic patients. Archives of Cardiovascular Diseases Supplements 2021. [DOI: 10.1016/j.acvdsp.2020.10.045] [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: 11/16/2022]
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Canu M, Jankowski A, Salvat M, Augier C, Casset C, Maurin M, Vanzetto G, Djaileb L, Riou L, Fagret D, Ghezzi C, Barone-Rochette G. Coronary atherosclerotic burden in non-ischemic dilated cardiomyopathies: Prognostic implications. A substudy of 3C registry. Archives of Cardiovascular Diseases Supplements 2021. [DOI: 10.1016/j.acvdsp.2020.10.039] [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: 10/22/2022]
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7
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Canu M, Carabelli A, Debiossat M, Broisat A, Desvignes M, Ghezzi C, Barone-Rochette G, Riou L. Effects of liraglutide on heart function and myocardial perfusion entropy in a type-2 diabetic rat model. Archives of Cardiovascular Diseases Supplements 2020. [DOI: 10.1016/j.acvdsp.2020.03.034] [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: 11/25/2022]
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8
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Dumas L, Piliero N, Montemagno C, Ahmadi M, Bacot S, Pascal P, Riou L, Fagret D, Barone-Rochette G, Broisat A, Ghezzi C. Evaluation of anti-atherogenic effects of P2Y12 receptor antagonists in Apolipoprotein E-deficient mice. Archives of Cardiovascular Diseases Supplements 2019. [DOI: 10.1016/j.acvdsp.2019.02.007] [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: 11/26/2022]
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9
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Broisat A, Lemasson B, Ahmadi M, Collomb N, Bacot S, Soubies A, Fagret D, Rémy C, Ghezzi C, Barbier EL. Mapping of brain tissue hematocrit in glioma and acute stroke using a dual autoradiography approach. Sci Rep 2018; 8:9878. [PMID: 29959336 PMCID: PMC6026160 DOI: 10.1038/s41598-018-28082-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 02/20/2018] [Accepted: 06/15/2018] [Indexed: 11/09/2022] Open
Abstract
Hematocrit (Hct) determines the ability of blood to carry oxygen. While changes in systemic Hct are known to impact stroke or tumor control, changes in local (tissue) Hct (tHct) induced by these diseases have however received little attention. In this study, we evaluate tHct in acute stroke and in glioma models using a new approach to map tHct across the brain, a dual isotope autoradiography, based on injections of 125I-labeled albumin and 99mTc-lalbeled red blood cells in the same animal. For validation purpose, tHct was mapped in the rat brain (i) under physiological conditions, (ii) following erythropoietin injection, and (iii) following hemodilution. Then, tHct was then mapped in stroke (middle cerebral artery occlusion) and tumor models (9LGS and C6). The mean tHct values observed in healthy brains (tHct = 29 ± 1.3%), were modified as expected by erythropoietin (tHct = 36.7 ± 2.6%) and hemodilution (tHct = 24.2 ± 2.4%). Using the proposed method, we observed a local reduction, spatially heterogeneous, in tHct following acute stroke (tHct = 19.5 ± 2.5%) and in both glioma models (9LGS: tHct = 18.5 ± 2.3%, C6: tHct = 16.1 ± 1.2%). This reduction and this heterogeneity in tHct observed in stroke and glioma raises methodological issues in perfusion imaging techniques where tHct is generally overlooked and could impact therapeutic strategies.
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Affiliation(s)
- A Broisat
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - B Lemasson
- Univ. Grenoble Alpes, Inserm, U1216, GIN, F-38000, Grenoble, France
| | - M Ahmadi
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - N Collomb
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, IRMaGe, CNRS, F-38000, Grenoble, France
| | - S Bacot
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - A Soubies
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - D Fagret
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - C Rémy
- Univ. Grenoble Alpes, Inserm, U1216, GIN, F-38000, Grenoble, France
| | - C Ghezzi
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - E L Barbier
- Univ. Grenoble Alpes, Inserm, U1216, GIN, F-38000, Grenoble, France.
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Donghi C, Vaghi S, Varoni E, Ghezzi C. Nuovi concetti nella terapia parodontale non chirurgica minimamente invasiva. Dental Cadmos 2016. [DOI: 10.19256/d.cadmos.10.2016.05] [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: 11/20/2022]
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11
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Virgone-Carlotta A, Dufour E, Bacot S, Ahmadi M, Cornou M, Moni L, Garcia J, Chierici S, Garin D, Marti-Batlle D, Perret P, Ghersi-Egea J, Moulin Sallanon M, Fagret D, Ghezzi C. New diketopiperazines as vectors for peptide protection and brain delivery: Synthesis and biological evaluation. J Labelled Comp Radiopharm 2016; 59:517-530. [DOI: 10.1002/jlcr.3442] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 07/10/2016] [Accepted: 08/03/2016] [Indexed: 12/13/2022]
Affiliation(s)
| | - E. Dufour
- Université Grenoble Alpes; Grenoble France
- Département de Chimie Moléculaire; Centre National de la Recherche Scientifique, UMR 5250; Grenoble France
| | - S. Bacot
- INSERM U1039; La Tronche France
- Université Grenoble Alpes; Grenoble France
| | - M. Ahmadi
- INSERM U1039; La Tronche France
- Université Grenoble Alpes; Grenoble France
| | - M. Cornou
- Université Grenoble Alpes; Grenoble France
- Département de Chimie Moléculaire; Centre National de la Recherche Scientifique, UMR 5250; Grenoble France
| | - L. Moni
- Université Grenoble Alpes; Grenoble France
- Département de Chimie Moléculaire; Centre National de la Recherche Scientifique, UMR 5250; Grenoble France
| | - J. Garcia
- Université Grenoble Alpes; Grenoble France
- Département de Chimie Moléculaire; Centre National de la Recherche Scientifique, UMR 5250; Grenoble France
| | - S. Chierici
- Université Grenoble Alpes; Grenoble France
- Département de Chimie Moléculaire; Centre National de la Recherche Scientifique, UMR 5250; Grenoble France
| | - D. Garin
- INSERM U1039; La Tronche France
- Université Grenoble Alpes; Grenoble France
| | - D. Marti-Batlle
- INSERM U1039; La Tronche France
- Université Grenoble Alpes; Grenoble France
| | - P. Perret
- INSERM U1039; La Tronche France
- Université Grenoble Alpes; Grenoble France
| | - J.F. Ghersi-Egea
- INSERM, U1028; CNRS, UMR5292; Lyon France
- BIP Platform, Lyon Neuroscience Research Center; Université Lyon 1; Lyon France
| | - M. Moulin Sallanon
- INSERM U1039; La Tronche France
- Université Grenoble Alpes; Grenoble France
| | - D. Fagret
- INSERM U1039; La Tronche France
- Université Grenoble Alpes; Grenoble France
| | - C. Ghezzi
- INSERM U1039; La Tronche France
- Université Grenoble Alpes; Grenoble France
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Lagan J, Rio P, Barone-Rochette G, Limeres Freire J, Abreu A, Clerc OF, Iriart X, Van Den Hoven AT, Meah M, Hasleton J, Mcshane J, Trent R, Abreu A, Santos V, Santa-Clara H, Oliveira L, Martins Oliveira M, Silva Cunha P, Moura Branco L, Mota Carmo M, Cruz Ferreira R, Zoreka FZ, Calizzano A, Vautrin E, Quesada JL, Broisat A, Riou L, Baguet JP, Fagret D, Ghezzi C, Rodriguez J, Oristrell G, Quiroga X, Pizzi N, Perez-Rodon J, Galve E, Aguade S, Santa Clara H, Santos V, Oliveira L, Oliveira M, Rio P, Cunha P, Portugal G, Ferreira R, Mota Carmo M, Kaufmann BP, Possner M, Liga R, Vontobel J, Mikulicic F, Graeni C, Benz DC, Kaufmann PA, Buechel RR, Selmi W, Jalal Z, Thambo JB, Saru-Chelu RG, Duijnhouwer AL, Van Hagen IM, Roos-Hesselink JW. Rapid Fire Abstract session: usefulness of CT and radionuclide imaging in different clinical scenarios378Improving the cost-effectiveness of chest pain investigations using single photon emission computed tomography379Is autonomic nervous dysfunction severity associated to less benefit from cardiac resynchronization therapy?380Validation of stress Thallium-201/Rest Technetium-99m sequential dual isotope high-speed myocardial perfusion imaging against fractional flow reserve for the detection of the extent of ischemia.381Nuclear imaging to predict adverse events in heart failure patients382Autonomic nervous system modulation in patients with heart failure and resynchronization after high intensity interval training383Long-term prediction of cardiac events using low-dose coronary ct angiography with prospective triggering384Left atrial appendage sizing for percutaneous occlusion with Amplatzer cardiac plug: a multimodality imaging approach385Evaluation of PAPVR using cardiac CT or MR imaging in patients with Turner syndrome. Eur Heart J Cardiovasc Imaging 2015. [DOI: 10.1093/ehjci/jev253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Levandis G, Balestra B, Siani F, Rizzo V, Ghezzi C, Ambrosi G, Cerri S, Bonizzi A, Vicini R, Vairetti M, Ferrigno A, Pastoris O, Blandini F. Response of colonic motility to dopaminergic stimulation is subverted in rats with nigrostriatal lesion: relevance to gastrointestinal dysfunctions in Parkinson's disease. Neurogastroenterol Motil 2015; 27:1783-95. [PMID: 26433214 DOI: 10.1111/nmo.12691] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [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] [Received: 04/29/2015] [Accepted: 08/25/2015] [Indexed: 02/08/2023]
Abstract
BACKGROUND Constipation is extremely common in patients with Parkinson's disease (PD) and has been described in PD animal models. In this study, we investigated whether a PD-like degeneration of dopaminergic neurons of the substantia nigra can influence peristalsis in colonic segments of rats by impacting on enteric dopaminergic transmission. METHODS Male, Sprague-Dawley rats received a unilateral injection of neurotoxin 6-hydroxydopamine (6-OHDA), or saline, into the medial-forebrain-bundle. Peristaltic activity was recorded in isolated colonic segments, in baseline conditions and following exposure to combinations of D2 receptor (DRD2) agonist sumanirole and antagonist L-741626. Dopamine levels and DRD2 expression were assessed in the ileum and colon of animals. We also investigated the involvement of the dorsal motor nucleus of the vagus (DMV) - a potential relay station between central dopaminergic denervation and gastrointestinal (GI) dysfunction - by analyzing cytochrome c oxidase activity and FosB/DeltaFosB expression in DMV neurons. KEY RESULTS We observed profound alterations in the response of colonic segments of 6-OHDA lesioned animals to DRD2 stimulation. In fact, the inhibition of colonic peristalsis elicited by sumanirole in control rats was absent in 6-OHDA-lesioned animals. These animals also showed reduced DRD2 expression in the colon, along with elevation of dopamine levels. No significant changes were detected within the DMV. CONCLUSIONS & INFERENCES Our results demonstrate that selective lesion of the nigrostriatal dopaminergic pathway subverts the physiological response of the colon to dopaminergic stimulation, opening new perspectives in the comprehension and treatment of GI dysfunctions associated with PD.
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Affiliation(s)
- G Levandis
- Laboratory of Functional Neurochemistry, Center for Research in Neurodegenerative Diseases, "C. Mondino", National Neurological Institute, Pavia, Italy
| | - B Balestra
- Dept. of Biology and Biotechnology, University of Pavia, Pavia, Italy
| | - F Siani
- Laboratory of Functional Neurochemistry, Center for Research in Neurodegenerative Diseases, "C. Mondino", National Neurological Institute, Pavia, Italy
| | - V Rizzo
- Department of Molecular Medicine, IRCCS San Matteo Foundation, University of Pavia, Pavia, Italy
| | - C Ghezzi
- Laboratory of Functional Neurochemistry, Center for Research in Neurodegenerative Diseases, "C. Mondino", National Neurological Institute, Pavia, Italy
| | - G Ambrosi
- Laboratory of Functional Neurochemistry, Center for Research in Neurodegenerative Diseases, "C. Mondino", National Neurological Institute, Pavia, Italy
| | - S Cerri
- Laboratory of Functional Neurochemistry, Center for Research in Neurodegenerative Diseases, "C. Mondino", National Neurological Institute, Pavia, Italy
| | - A Bonizzi
- Laboratory of Functional Neurochemistry, Center for Research in Neurodegenerative Diseases, "C. Mondino", National Neurological Institute, Pavia, Italy
| | - R Vicini
- Dept. of Biology and Biotechnology, University of Pavia, Pavia, Italy
| | - M Vairetti
- Department of Internal Medicine and Therapeutics, University of Pavia, Pavia, Italy
| | - A Ferrigno
- Department of Internal Medicine and Therapeutics, University of Pavia, Pavia, Italy
| | - O Pastoris
- Dept. of Biology and Biotechnology, University of Pavia, Pavia, Italy
| | - F Blandini
- Laboratory of Functional Neurochemistry, Center for Research in Neurodegenerative Diseases, "C. Mondino", National Neurological Institute, Pavia, Italy
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Gorni M, Parisini A, Gombia E, Baldini M, Vantaggio S, Ghezzi C. Electrical characterization of a buried GaSb p-n junction controlled by native defects. Crystal Research and Technology 2014. [DOI: 10.1002/crat.201300411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- M. Gorni
- CNISM-Dipartimento di Fisica; Università di Parma; Viale G.P. Usberti n.7/A - 43124 Parma Italy
| | - A. Parisini
- CNISM-Dipartimento di Fisica; Università di Parma; Viale G.P. Usberti n.7/A - 43124 Parma Italy
| | - E. Gombia
- IMEM-CNR; Parco Area delle Scienze 37/A - 43100 Parma Italy
| | - M. Baldini
- Leibniz Institute for Crystal Growth; Berlin Germany
| | - S. Vantaggio
- CNISM-Dipartimento di Fisica; Università di Parma; Viale G.P. Usberti n.7/A - 43124 Parma Italy
| | - C. Ghezzi
- CNISM-Dipartimento di Fisica; Università di Parma; Viale G.P. Usberti n.7/A - 43124 Parma Italy
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15
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Grauzam S, Henri M, Slimani L, Vidal S, Perret P, Fagret D, Boucher F, Ghezzi C. Mesure de la résistance à l’insuline avec un traceur radioactif du transport du glucose : [123I]-6-Déoxy-6-Iodo-D-Glucose. Ing Rech Biomed 2011. [DOI: 10.1016/j.irbm.2011.01.013] [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: 11/28/2022]
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16
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Baldini M, Ghezzi C, Parisini A, Tarricone L, Vantaggio S, Gombia E, Motta A, Gasparotto A. Growth and characterization of buried GaSb p-n junctions for photovoltaic applications. Cryst Res Technol 2011. [DOI: 10.1002/crat.201000639] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Riou LM, Broisat A, Dimastromatteo J, Pons G, Fagret D, Ghezzi C. Pre-clinical and clinical evaluation of nuclear tracers for the molecular imaging of vulnerable atherosclerosis: an overview. Curr Med Chem 2009; 16:1499-511. [PMID: 19355903 DOI: 10.2174/092986709787909596] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Cardiovascular diseases (CVD) are the leading cause of mortality worldwide. Despite major advances in the treatment of CVD, a high proportion of CVD victims die suddenly while being apparently healthy, the great majority of these accidents being due to the rupture or erosion of a vulnerable coronary atherosclerotic plaque. A non-invasive imaging methodology allowing the early detection of vulnerable atherosclerotic plaques in selected individuals prior to the occurrence of any symptom would therefore be of great public health benefit. Nuclear imaging could allow the identification of vulnerable patients by non-invasive in vivo scintigraphic imaging following administration of a radiolabeled tracer. The purpose of this review is to provide an overview of radiotracers that have been recently evaluated for the detection of vulnerable plaques together with the biological rationale that initiated their development. Radiotracers targeted at the inflammatory process seem particularly relevant and promising. Recently, macrophage targeting allowed the experimental in vivo detection of atherosclerosis using either SPECT or PET. A few tracers have also been evaluated clinically. Targeting of apoptosis and macrophage metabolism both allowed the imaging of vulnerable plaques in carotid vessels of patients. However, nuclear imaging of vulnerable plaques at the level of coronary arteries remains challenging, mostly because of their small size and their vicinity with unbound circulating tracer. The experimental and pilot clinical studies reviewed in the present paper represent a fundamental step prior to the evaluation of the efficacy of any selected tracer for the early, non-invasive detection of vulnerable patients.
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Affiliation(s)
- L M Riou
- INSERM, U877, Radiopharmaceutiques Biocliniques, Faculté de Médecine de Grenoble, F-38700, La tronche, France.
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Dimastromatteo J, Ahmadi M, Broisat A, Riou LM, Boturyn D, Henri M, Garin D, Pons G, Tocsek J, Dumy P, Fagret D, Ghezzi C. A030 In vivo molecular imaging of vascular cell adhesion molecule-1 expression in atherosclerotic plaques. Arch Cardiovasc Dis 2009. [DOI: 10.1016/s1875-2136(09)72163-1] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Martegani P, Silvestri M, Mascarello F, Scipioni T, Ghezzi C, Rota C, Cattaneo V. Morphometric Study of the Interproximal Unit in the Esthetic Region to Correlate Anatomic Variables Affecting the Aspect of Soft Tissue Embrasure Space. J Periodontol 2007; 78:2260-5. [PMID: 18052697 DOI: 10.1902/jop.2007.060517] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Albanese G, Deriu A, Ghezzi C. Rayleigh scattering of Mössbauer γ-rays in the amorphous polymer polymethyl methacrylate. ACTA ACUST UNITED AC 2007. [DOI: 10.1007/bf02743440] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Puig JG, Calvo C, Luurila O, Luurila H, Sulosaari S, Strandberg A, Ghezzi C. Lercanidipine, enalapril and their combination in the treatment of elderly hypertensive patients: placebo-controlled, randomized, crossover study with four ABPM. J Hum Hypertens 2007; 21:917-24. [PMID: 17581601 DOI: 10.1038/sj.jhh.1002248] [Citation(s) in RCA: 28] [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] [Indexed: 01/15/2023]
Abstract
This double-blind, placebo-controlled, four-way balanced design crossover study included hypertensive patients aged 60-85 years with mean office-measured sitting systolic blood pressure (SBP) 160-179 mm Hg and daytime SBP > or =135 mm Hg. After a 2-week run-in period, during which previous medications were discontinued, each patient received the following four treatments in randomized order for 4 weeks each: lercanidipine 10 mg (L), enalapril 20 mg (E), lercanidipine 10 mg plus enalapril 20 mg (L/E) and placebo (P). At the end of each treatment period, office trough blood pressure (BP) was measured and a 24-h Ambulatory Blood Pressure Monitoring (ABPM) was performed. Seventy-five patients (mean age 66 years, office BP 168/92 mm Hg, daytime SBP 151 mm Hg) were randomized and 62 completed the study with four valid post-baseline ABPMs. The administration of P, L, E and L/E was associated with a mean 24-h SBP of 144, 137, 133 and 127 mm Hg, respectively. All active treatments significantly reduced the mean 24-h SBP in comparison with placebo, but L/E was significantly more effective than L and E alone. Similarly, office SBP was significantly more reduced with L/E (-16.9 mm Hg) than with L (-5.0 mm Hg) or E (-5.9 mm Hg). A BP <140/90 mm Hg was recorded in 18% of patients with L, 19% with E and 45% with L/E. Two patients on P and two on L/E were withdrawn from the study due to adverse events. In conclusion, combination therapy with L/E has additive antihypertensive effects on both ambulatory and office BP in elderly patients and is well tolerated.
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Affiliation(s)
- J G Puig
- La Paz University Hospital, Madrid, Spain.
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Broisat A, Riou LM, Ardisson V, Boturyn D, Dumy P, Fagret D, Ghezzi C. Molecular imaging of vascular cell adhesion molecule-1 expression in experimental atherosclerotic plaques with radiolabelled B2702-p. Eur J Nucl Med Mol Imaging 2007; 34:830-40. [PMID: 17219135 DOI: 10.1007/s00259-006-0310-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [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: 01/15/2006] [Accepted: 10/20/2006] [Indexed: 11/29/2022]
Abstract
PURPOSE VCAM-1 plays a major role in the chronic inflammatory processes present in vulnerable atherosclerotic plaques. The residues 75-84 (B2702-p) and 84-75/75-84 (B2702-rp) of the major histocompatibility complex-1 (MHC-1) molecule B2702 were previously shown to bind specifically to VCAM-1. We hypothesised that radiolabelled B2702-p and B2702-rp might have potential for the molecular imaging of vascular cell adhesion molecule-1 (VCAM-1) expression in atherosclerotic plaques. METHODS Preliminary biodistribution studies indicated that 125I-B2702-rp was unsuitable for in vivo imaging owing to extremely high lung uptake. 123I- or 99mTc-labelled B2702-p was injected intravenously to Watanabe heritable hyperlipidaemic rabbits (WHHL, n=6) and control animals (n=6). After 180 min, aortas were harvested for ex vivo autoradiographic imaging, gamma-well counting, VCAM-1 immunohistology and Sudan IV lipid staining. RESULTS Robust VCAM-1 immunostaining was observed in Sudan IV-positive and to a lesser extent in Sudan IV-negative areas of WHHL animals, whereas no expression was detected in control animals. Significant 2.9-fold and 1.9-fold increases in 123I-B2702-p and 99mTc-B2702-p aortic-to-blood ratios, respectively, were observed between WHHL and control animals (p<0.05). Tracer uptake on ex vivo images co-localised with atherosclerotic plaques. Image quantification indicated a graded increase in 123I-B2702-p and 99mTc-B2702-p activities from control to Sudan IV-negative and to Sudan IV-positive areas, consistent with the observed pattern of VCAM-1 expression. Sudan IV-positive to control area tracer activity ratios were 17.0+/-9.0 and 5.9+/-1.8 for 123I-B2702-p and 99mTc-B2702-p, respectively. CONCLUSION Radiolabelled B2702-p is a potentially useful radiotracer for the molecular imaging of VCAM-1 in atherosclerosis.
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Affiliation(s)
- A Broisat
- INSERM, U340, Radiopharmaceutiques Biocliniques, 38700, La Tronche, France
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Riou LM, Broisat A, Lartizien C, Toufektsian MC, Maitrejean S, Janier M, Vanzetto G, Fagret D, Ghezzi C. Assessment of non-reperfused and reperfused myocardial infarction using diffusible or deposited radiolabelled perfusion imaging agents. Eur J Nucl Med Mol Imaging 2006; 34:330-7. [PMID: 17004095 DOI: 10.1007/s00259-006-0230-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 05/10/2006] [Accepted: 07/17/2006] [Indexed: 12/22/2022]
Abstract
PURPOSE Incomplete microvascular reperfusion is often observed in patients undergoing thrombolytic therapy or angioplasty for acute myocardial infarction and has important prognostic implications. We compared the myocardial uptake of diffusible ((201)Tl) and deposited ((99m)TcN-NOET) perfusion imaging agents in the setting of experimental infarction. METHODS Rats were subjected to permanent coronary occlusion (OCC, n=10) or to 45-min occlusion and reperfusion (REP, n=17). Seven days later, the tracers were co-injected and the animals were euthanised 15 min (all ten rats in the OCC group and 12 rats in the REP group) or 120 min (five rats from the REP group, euthanised at this time point to evaluate any redistribution of the tracers: REP-RED group) afterwards. Infarct size determination and (99m)TcN-NOET/(201)Tl ex vivo imaging were performed. Regional flow and tissue oedema were quantified using radioactive microspheres and (99m)Tc-DTPA, respectively. RESULTS (99m)TcN-NOET and (201)Tl defect magnitudes were similar in OCC animals (0.11+/-0.01 vs 0.13+/-0.01). In REP animals, (201)Tl defect magnitude (0.25+/-0.02) was significantly lower than the magnitude of (99m)TcN-NOET and flow defects (0.14+/-0.03 and 0.17+/-0.01, respectively; p<0.05), despite the lack of (201)Tl redistribution (REP-RED animals). (99m)Tc-DTPA indicated the presence of oedema in the reperfused area. Blood distribution studies showed that, unlike (99m)TcN-NOET, (201)Tl plasma activity was mostly unbound to plasma proteins. CONCLUSION (99m)TcN-NOET and (201)Tl delineated the non-viable area in chronic non-reperfused and reperfused myocardial infarction. The significantly decreased (201)Tl defect in reperfused infarction was likely due to partial diffusion of the tracer from the plasma into the oedema present in the infarcted area. Deposited perfusion tracers might be better suited than diffusible agents for the assessment of regional flow following reperfusion of myocardial infarction.
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Affiliation(s)
- L M Riou
- INSERM, U340 Radiopharmaceutiques Biocliniques; Université de Grenoble, La Tronche, France.
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Gombia E, Mosca R, Franchi S, Frigeri P, Ghezzi C. Electrical characterization of InAs/GaAs quantum dot structures. Materials Science and Engineering: C 2006. [DOI: 10.1016/j.msec.2005.09.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Begotti M, Ghezzi C, Longo M, Magnanini R, Parisini A, Tarricone L, Vantaggio S. Zinc doped GaAs epitaxial layers MOVPE grown by liquid metalorganic sources. Cryst Res Technol 2005. [DOI: 10.1002/crat.200410471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Perret P, Ghezzi C, Mathieu JP, Morin C, Fagret D. Assessment of insulin sensitivity in vivo in control and diabetic mice with a radioactive tracer of glucose transport: [125I]-6-deoxy-6-iodo-D-glucose. Diabetes Metab Res Rev 2003; 19:306-12. [PMID: 12879408 DOI: 10.1002/dmrr.382] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Impairment of insulin-stimulated glucose transport is a characteristic of type 2 diabetes. A radioactive glucose analogue has been synthesized: [(125)I]-6-deoxy-6-iodo-D-glucose. Its biological behaviour in vitro is similar to that of 3-O-methyl-D-glucose, the reference tracer of glucose transport. The aim of the present study was to determine the ability of [(125)I]-6-deoxy-6-iodo-D-glucose to evaluate variations in glucose transport in vivo. METHODS Biodistributions of [(125)I]-6-deoxy-6-iodo-D-glucose were performed with or without exogenous insulin (iv injection of 1.5 IU/kg) in db/+ non-diabetic control mice and in db/db type 2 diabetic mice, exhibiting a severe insulin resistance characterized by a lack of increase in glucose uptake in response to insulin. RESULTS In db/+ mice, insulin increased [(125)I]-6-deoxy-6-iodo-D-glucose transport by 30% in most insulin-sensitive tissues (heart, diaphragm and skeletal muscle, p < 0.05) and had no effect in other organs. In db/db mice, [(125)I]-6-deoxy-6-iodo-D-glucose transport in these organs was not modified by insulin. CONCLUSION [(125)I]-6-deoxy-6-iodo-D-glucose is able to trace in vivo an increase in glucose transport with insulin in non-diabetic mice and a defect of glucose transport in type 2 diabetic mice. It is the first time that an iodinated analogue of glucose has shown such promising results after in vivo injection. The use of this tracer to assess glucose transport in vivo in humans via nuclear imaging warrants further investigation.
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Affiliation(s)
- P Perret
- Radiopharmaceutiques Biocliniques, INSERM E 0340, Faculté de Médecine de Grenoble, Domaine de la Merci, La Tronche, France
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Fagret D, Ghezzi C, Vanzetto G. 99mTc-N-NOET imaging for myocardial perfusion: can it offer more than we already have? J Nucl Med 2001; 42:1395-6. [PMID: 11535731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023] Open
Affiliation(s)
- D Fagret
- Université de Grenoble, La Tronche, France
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Riou L, Ghezzi C, Pasqualini R, Fagret D. Influence of calcium channel inhibitors on the myocardial uptake and retention of technetium 99m N-NOET, a new myocardial perfusion imaging agent: a study on isolated perfused rat hearts. J Nucl Cardiol 2000; 7:365-72. [PMID: 10958279 DOI: 10.1067/mnc.2000.107073] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Technetium 99m N-NOET is a new myocardial perfusion imaging agent currently in phase III clinical trials in Europe. In vitro studies on newborn rat cardiomyocytes have shown that calcium inhibitors, such as verapamil or diltiazem, inhibit its cellular uptake by 40%. To determine whether such a specificity exists ex vivo, we studied the effect of verapamil, diltiazem, and nifedipine on the myocardial uptake and retention of Tc-99m N-NOET in isolated perfused rat hearts. METHODS AND RESULTS After a 15-minute baseline period, rat hearts were perfused with 0.5 micromol/L verapamil (n = 6), 0.75 micromol/L diltiazem (n = 6), or 0.1 micromol/L nifedipine (n = 6) for 10 minutes before the injection of a bolus (40 microCi/250 microL) of the tracer. Control hearts were perfused with either 1.5 mmol/L calcium (same concentration as in the treated groups; n = 7) or 0.75 mmol/L calcium (same contractility as in the treated groups; n = 6). Myocardial activity of Tc-99m N-NOET was monitored for 30 minutes. The functional parameters of the hearts were recorded throughout the experiments. Calcium inhibitors induced a 40% to 55% decrease in maximal first derivative of left ventricular pressure (dP/dt) (0.0001<P< .001 versus control, calcium 1.5 mmol/L). After 30 minutes, tracer retention was 51.6%+/-6.1% injected dose (ID)/g and 54.2%+/-10.2% ID/g for control hearts perfused with 1.5 mmol/L and 0.75 mmol/L calcium, respectively (P = not significant). Myocardial activity of Tc-99m N-NOET was not modified in hearts perfused with verapamil (50.0%+/-4.1% ID/g), diltiazem (47.2%+/-8.7% ID/g), or nifedipine (51.7%+/-3.4% ID/g; P = not significant versus control hearts perfused with 1.5 mmol/L or 0.75 mmol/L calcium). CONCLUSIONS Verapamil, diltiazem, and nifedipine were not responsible for any variations in Tc-99m N-NOET uptake and retention in the isolated rat-heart model. This might be explained by the binding of the tracer to endothelial cells, which do not present voltage-dependent calcium channels.
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Affiliation(s)
- L Riou
- Laboratoire d'Etude de Radiopharmaceutiques, Faculté de Médecine, Université Joseph Fourier, Grenoble, France
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Riou L, Ghezzi C, Mouton O, Mathieu JP, Pasqualini R, Comet M, Fagret D. Cellular uptake mechanisms of 99mTcN-NOET in cardiomyocytes from newborn rats: calcium channel interaction. Circulation 1998; 98:2591-7. [PMID: 9843468 DOI: 10.1161/01.cir.98.23.2591] [Citation(s) in RCA: 12] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Bis[N-ethoxy,N-ethyl(dithiocarbamato)]nitrido Tc (V) (TcN-NOET) is a new technetium complex proposed as a tracer of myocardial perfusion. However, its cellular uptake mechanisms are unknown, although membrane localization on rat heart preparations and preferential binding to polymorphonuclear neutrophils (PMNs) have been reported. Because of the central role of calcium in PMN actions, a relationship was hypothesized between this ion flux and TcN-NOET cellular uptake. METHODS AND RESULTS The mechanisms of cellular uptake of TcN-NOET were investigated in newborn rat cardiomyocytes by study of the effect of calcium channel modulators on tracer binding. Nifedipine had no effect on tracer uptake at 1 minute. However, verapamil 0.1 micromol/L and diltiazem 0.5 micromol/L induced a 40% decrease in uptake. Conversely, Bay K 8644 0.25 micromol/L increased TcN-NOET uptake by 73%. Alterations in other membrane ion transports failed to modify tracer uptake, indicating the specificity of the relationship between TcN-NOET uptake and calcium channels. Kinetic studies indicated that cellular net accumulation of the tracer was slow (t1/2=28.5 minutes) and retention was prolonged (84% of initial activity retained after 120 minutes of washout). The energy dependence of TcN-NOET uptake was investigated after 60 minutes of metabolic inhibition by iodoacetic acid plus rotenone. The ATP decrease was not associated with reduction in tracer uptake at 1 minute (114.9+/-21.9% of control, P=NS). CONCLUSIONS The decrease in uptake observed with verapamil and diltiazem, the increase with Bay K 8644, and the lack of effect with nifedipine suggest that TcN-NOET binds to L-type calcium channels in the open configuration, without entering cardiomyocytes. The kinetics of TcN-NOET accumulation and retention are slow, and the mechanism for cellular uptake is not energy-dependent. From a clinical point of view, the effect of concurrent treatment by calcium inhibitors on myocardial binding of TcN-NOET should be taken into account.
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Affiliation(s)
- L Riou
- Laboratoire d'Etudes des Radiopharmaceutiques, ESA CNRS 5077, Faculté de médecine, Université Joseph Fourier, Grenoble, France
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Brunet-Desruet MD, Ghezzi C, Morin C, Comet M, Fagret D. Biological evaluation of two iodine-123-labeled D-glucose acetals prepared as glucose transporter radioligands. Nucl Med Biol 1998; 25:473-80. [PMID: 9720665 DOI: 10.1016/s0969-8051(98)00005-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 11/29/2022]
Abstract
Two iodinated acetals of D-glucose, 4,6-(R)-O-(2'-iodoethylidene)-alpha, beta-D-glucose (1) and 4,6-(R)-O-(4'-iodobenzylidene)-alpha, beta-D-glucose (2), were prepared and their potential as suitable SPECT radioligands for imaging of glucose transporters was studied. Both are analogs of acetal D-glucose derivatives, which are known to bind to the exofacial sites of the glucose transport protein (GluT). To assess whether iodinated acetals 1 and 2 interacted with the glucose transporter, they were tested in vitro in human erythrocytes (GluT1) and neonatal rat cardiomyocytes (GluT4). The results indicated that 1 and 2 had a very low affinity for the glucose transporter and probably accumulated in cells. Study of their tissue distribution was carried out in the mouse in vivo: Both compounds showed fast tissue clearance with preferential renal elimination. It is concluded that iodinated acetals of D-glucose 1 and 2 are not suitable for GluT targeting in vivo.
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Affiliation(s)
- M D Brunet-Desruet
- Laboratoire D'Etude des Radiopharmaceutiques, ESA CNRS 5077, Faculté de Médecine et de Pharmacie, Université de Grenoble, La Tronche, France
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Valsecchi C, Ghezzi C, Ballabio A, Rugarli EI. JAGGED2: a putative Notch ligand expressed in the apical ectodermal ridge and in sites of epithelial-mesenchymal interactions. Mech Dev 1997; 69:203-7. [PMID: 9486542 DOI: 10.1016/s0925-4773(97)00146-9] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The Drosophila Notch gene and its ligands, Delta and Serrate, are involved in cell fate determination in a variety of developing tissues. Recently, several Notch, Delta and Serrate homologues have been identified in vertebrates. We report here the cloning of the human and murine JAGGED2 (JAG2), a Serrate-like gene, and the analysis of its expression pattern during embryogenesis. Jag2 was found to be expressed as early as E9 in the surface ectoderm of the branchial arches and in the apical ectodermal ridge (AER) of the developing limb. At E12.5, Jag2 expression is upregulated in differentiated neurons of the central and peripheral nervous system and in the inner neuroblastic layer of the developing retina. Outside the nervous system, Jag2 is expressed in the developing vibrissae follicles, tooth buds, thymus, submandibular gland and stomach. Our findings suggest the involvement of Jagged2 in the development of the mammalian limb, branchial arches, central and peripheral nervous systems and several tissues whose development depends upon epithelial-mesenchymal interactions.
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Affiliation(s)
- C Valsecchi
- Telethon Institute of Genetics and Medicine, San Raffaele Biomedical Science Park, Milan, Italy
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Henry C, Koumanov F, Ghezzi C, Morin C, Mathieu JP, Vidal M, de Leiris J, Comet M, Fagret D. [123I]-6-deoxy-6-iodo-D-glucose (6DIG): a potential tracer of glucose transport. Nucl Med Biol 1997; 24:527-34. [PMID: 9316080 DOI: 10.1016/s0969-8051(97)00037-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A glucose analogue labelled with iodine-123 in position 6 has been synthesized: [123I]-6-deoxy-6-iodo-D-glucose (6DIG). The aim of this study was to examine its biological behaviour in order to assess whether it could be used to evaluate glucose transport with SPECT. To establish whether 6DIG enters the cells using the glucose transporter, four biological models have been used: human erythrocytes in suspension, neonatal rat cardiomyocytes in culture, isolated perfused rat hearts, and biodistribution in mice. 6DIG competed with D-glucose to enter the cells and its entry was increased by insulin and inhibited in the presence of cytochalasin B. The biological behaviour of 6DIG was similar to that of 3-O-methyl-D-glucose. 6DIG is a tracer of glucose transport which is very promising for clinical studies.
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Affiliation(s)
- C Henry
- Laboratoire d'Etudes des Radiopharmaceutiques, Groupe de Physiologie et Physiopathologie Cellulaires Cardiaques, La Tronche, France
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Koumanov F, Henry C, Ghezzi C, Mathieu JP, Morin C, Vidal M, de Leiris J, Comet M, Fagret D. Biological evaluation of two anomeric glucose analogues iodinated in position 6. Nucl Med Biol 1997; 24:519-25. [PMID: 9316079 DOI: 10.1016/s0969-8051(97)00022-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 02/05/2023]
Abstract
Two anomeric analogues of glucose labelled with 123 iodine in position 6, proposed as tracers of glucose transport in vivo, have been synthesized: alpha- and beta-methyl-6-deoxy-6-iodo-D-glucopyranoside (alpha MDIG and beta MDIG). The aim of this study was to determine whether these molecules interact with the glucose transporter and whether they could be used as tracers of glucose transport in vivo. The biodistribution of alpha MDIG and beta MDIG was studied in the mouse in vivo. To determine if these two anomers enter the cell via the glucose transporter, their uptake was measured in isolated perfused rat hearts, in human erythrocytes in suspension, and in cardiomyocytes of neonatal rat in culture. Both alpha MDIG and beta MDIG had similar repartitions in the mouse: myocardial uptake averaged 7% of the injected dose/g of organ at 2 min postinjection and alpha MDIG competed with D-glucose to enter the cells. Insulin produced a 123% increase of its uptake in isolated perfused rat hearts and a 100% increase in cardiomyocytes of neonatal rat in culture. alpha MDIG uptake was lowered in the presence of glucose transport inhibitors in each experimental model. An interaction between beta MDIG and glucose transporters was observed only in human erythrocytes in suspension. Only alpha MDIG interacts with the glucose transporter, and thus could be used to estimate glucose transport in vivo.
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Affiliation(s)
- F Koumanov
- Laboratoire d'Etudes des Radiopharmaceutiques, Université Joseph Fourier, Grenoble, France
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Rugarli EI, Ghezzi C, Valsecchi V, Ballabio A. The Kallmann syndrome gene product expressed in COS cells is cleaved on the cell surface to yield a diffusible component. Hum Mol Genet 1996; 5:1109-15. [PMID: 8842728 DOI: 10.1093/hmg/5.8.1109] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Kallmann syndrome is characterized by hypogonadotropic hypogonadism and anosmia and caused by a defect of migration and targeting of gonadotropin-releasing hormone-secreting neurons and olfactory axons during embryonic development. We previously cloned the gene responsible for the X-linked form of the disease encoding a 680 amino acid protein, KAL, which displays the unusual combination of a protease inhibitor domain with fibronectin type III repeats. Previous expression studies by northern blot and RNA in situ hybridization in human and chick indicated that the gene is expressed at very low levels in the olfactory bulb during development. Therefore, low abundance of the protein has hampered a detailed biochemical characterization. By overexpressing both the human and chick KAL cDNAs in eukaryotic cells, we now provide evidence that KAL is a glycosylated peripheral membrane protein with an apparent molecular weight of approximately 100 kDa. We show that this 100 kDa protein is proteolytically processed on the cell membrane to yield a 45 kDa diffusible component, which is detectable with an antisera against the C-terminal part of the protein and binds tightly to cell surfaces. These data provide a first step toward understanding KAL function in neuronal interactions and neurite extension in the olfactory bulb and suggest that KAL might be a diffusible chemoattractant molecule for olfactory axons.
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Affiliation(s)
- E I Rugarli
- Telethon Institute of Genetics and Medicine, Milano, Italy
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Borasio GD, Markus A, Heumann R, Ghezzi C, Sampietro A, Wittinghofer A, Silani V. Ras p21 protein promotes survival and differentiation of human embryonic neural crest-derived cells. Neuroscience 1996; 73:1121-7. [PMID: 8809829 DOI: 10.1016/0306-4522(96)00084-x] [Citation(s) in RCA: 13] [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] [Indexed: 02/02/2023]
Abstract
We have previously shown that the oncogene product p21 Ras is essential for the survival and neurite outgrowth-promoting activity of nerve growth factor on cultured chick embryonic sensory, but not sympathetic neurons. In order to extend our observations to the human system and to non-neuronal cells, we introduced the oncogenic form of p21 Ras into the cytoplasm of three different types of cultured human embryonic neural crest derivatives (8th-11th gestational week): dorsal root ganglion neurons, sympathetic neurons, and adrenal chromaffin cells. These cells are dependent on nerve growth factor for survival and/or fibre outgrowth in vitro. In dorsal root ganglion neurons, p21 Ras promoted survival and fibre outgrowth which was quantitatively and qualitatively comparable to the nerve growth factor effect (84% vs. 95%, control 18%). Sympathetic neurons showed a similar effect, albeit with a higher background survival (91% vs. 93%, control 58%). On chromaffin cells, which respond to nerve growth factor with pronounced fibre outgrowth in culture, the effect of p21 Ras was again comparable to that of nerve growth factor (35% vs. 30%, control 5%). The survival and fibre outgrowth-promoting effects of p21 Ras on human embryonic dorsal root ganglion neurons, sympathetic neurons and chromaffin cells suggest an involvement of p21 Ras in the intracellular signal transduction of nerve growth factor in human neural crest-derived cell populations.
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Affiliation(s)
- G D Borasio
- Neurologische Klinik, Ludwig-Maximilians-Universität, Klinikum Grosshadern, München, Germany
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Baraldi A, Frigeri P, Ghezzi C, Parisini A, Bosacchi A, Franchi S, Gombia E, Mosca R. Coexistence of the DX center with nonmetastable states of the donor impurity in Si-doped AlxGa1-xAs: Effects on the low-temperature electron mobility. Phys Rev B Condens Matter 1996; 53:10715-10727. [PMID: 9982638 DOI: 10.1103/physrevb.53.10715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Koumanov F, Henry C, Ghezzi C, Bignan G, Morin C, Mathieu JP, Hamant S, Vidal M, de Leiris J, Comet M. Biological studies of analogues of glucose iodinated in positions 1, 2, or 3. Nucl Med Biol 1996; 23:53-60. [PMID: 9004915 DOI: 10.1016/0969-8051(95)02004-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [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: 02/03/2023]
Abstract
Analogues of glucose labeled with 123 iodine in positions 1, 2 or 3 have been synthesized. The aim of this study was to examine their biological behavior in four experimental models in order to assess whether they could be used to evaluate the uptake of glucose with single photon emission computed tomography (SPECT). The results obtained have shown that none of these molecules enters the cell using the glucose transporter. Therefore, they cannot be used as tracers of glucose uptake.
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Affiliation(s)
- F Koumanov
- Laboratoire D'Etudes Des Radiopharmaceutiques, Groupe de Physiologie et Physiopatiologie Cellulaires Cardiaques, URA CNRS, La Touche, France
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Henry C, Koumanov F, Ghezzi C, Mathieu JP, Hamant S, De Leiris J, Comet M. Experimental models, protocols, and reference values for evaluation of iodinated analogues of glucose. Nucl Med Biol 1995; 22:875-85. [PMID: 8547885 DOI: 10.1016/0969-8051(95)00036-w] [Citation(s) in RCA: 14] [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] [Indexed: 01/31/2023]
Abstract
For an iodinated analogue of glucose to be useful for evaluating glucose uptake using single-photon emission computed tomography (SPECT), it must enter the cell via the same transporter as glucose and accumulate within the cell without being degraded. The biological behavior of the iodinated tracer must therefore be similar to that of 2-deoxy-D(-)[1-14C]-glucose (2-DG). In the present study, four experimental models (biodistribution in mouse, isolated rat heart, human erythrocytes in suspension and cultured neonatal rat cardiomyocytes) have been chosen and protocols have been set up which allow for the examination of small quantities of iodinated analogues of glucose. The uptakes of 2-DG and of L(-)[1-14C]-glucose have been measured in these models to establish reference values which will be compared with uptake values for iodinated analogues of glucose.
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Affiliation(s)
- C Henry
- Laboratoire D'Etudes des Radiopharmaceutiques, URA CNRS 1287, Universitè Joseph Fourier, Grenoble, France
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Ghezzi C, Magnanini R, Parisini A, Rotelli B, Tarricone L, Bosacchi A, Franchi S. Optical absorption near the fundamental absorption edge in GaSb. Phys Rev B Condens Matter 1995; 52:1463-1466. [PMID: 9981195 DOI: 10.1103/physrevb.52.1463] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ghezzi C, Fagret D, Arvieux CC, Mathieu JP, Bontron R, Pasqualini R, de Leiris J, Comet M. Myocardial kinetics of TcN-NOET: a neutral lipophilic complex tracer of regional myocardial blood flow. J Nucl Med 1995; 36:1069-77. [PMID: 7769430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
UNLABELLED [Bis (N-etoxy, N ethyl dithiocarbamato) nitrido] 99mTc (V) (TcN-NOET) is a new neutral lipophilic myocardial imaging agent proposed for clinical use for detecting coronary artery disease. We studied the relation between myocardial retention of TcN-NOET and myocardial blood flow (MBF) in a canine model. METHODS A wide range of MBF was induced by partial regional coronary occlusion and dipyridamole infusion (protocols 1,2 and 3). Myocardial activity of TcN-NOET was determined by in vitro tissue counting at 15 or 90 min postinjection. Tracer activity was correlated with radiolabeled microspheres using linear regression analysis. RESULTS There was a linear correlation between myocardial TcN-NOET activity and microspheres in protocol 1 (r = 094, 15 min postinjection, protocol 2 (r = 0.94, 15 min postinjection after dipyridamole) and protocol 3 (r = 0.91, 90 min postinjection after dipyridamole). When arterial occlusion was discontinued (protocol 4), there was no longer a close linear correlation (r = 0.26). The first-pass myocardial extraction action of TcN-NOET was 75.5% +/- 4% under basal conditions and 85% +/- 2% under hyperemic conditions (p < 0.01). CONCLUSION Up to 90 min after injection, the relationship between TcN-NOET myocardial retention and blood flow is excellent over a wide range of flows. After reflow, TcN-NOET redistributes almost completely within 90 min.
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Affiliation(s)
- C Ghezzi
- Equipe de Physiopathologie Cellulaire Cardiaque et Laboratoire d'Etude des Radiopharmaceutiques, Université Joseph Fourier, Grenoble, France
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Pizzuti A, Colosimo A, Ratti A, Capon F, Gennarelli M, Silani V, Ghezzi C, Lo Cicero S, Calabrese G, Palka G. Identification of multiple transcribed sequences from the spinal muscular atrophy region of human chromosome 5. Biochem Biophys Res Commun 1995; 206:294-301. [PMID: 7818533 DOI: 10.1006/bbrc.1995.1041] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We report the isolation and characterization of novel expressed sequences from the spinal muscular atrophy (SMA) region on human chromosome 5q13. Based on the sequence homology studies these cDNAs were grouped in four classes, one of which shows extensive homologies with the beta-glucuronidase (BG) gene, differing in exon arrangement. The other cDNAs do not show any strong homology with known DNA sequences.
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Affiliation(s)
- A Pizzuti
- Istituto di Neurologia, Università di Milano, Italy
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Ghezzi C, Parisini A, Dallacasa V. Electron scattering by spatially correlated DX charges. Phys Rev B Condens Matter 1994; 50:2166-2175. [PMID: 9976430 DOI: 10.1103/physrevb.50.2166] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Silani V, Mariani D, Donato FM, Ghezzi C, Mazzucchelli F, Buscaglia M, Pardi G, Scarlato G. Development of dopaminergic neurons in the human mesencephalon and in vitro effects of basic fibroblast growth factor treatment. Exp Neurol 1994; 128:59-76. [PMID: 7915238 DOI: 10.1006/exnr.1994.1113] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [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: 01/27/2023]
Abstract
The origin and development of the mesencephalic dopaminergic (mesDA) neurons within the substantia nigra were characterized in human embryos from Postconception (PC) Week 5.0 to 12.0. Tyrosine hydroxylase (TH) immunoreactive cells were first demonstrated in the ventral mesencephalon at PC Week 5.5 next to the ventricular zone. Cell migration and neurite outgrowth of TH-positive neurons were timed. Early expression of ganglioside GM1 was demonstrated in developing neurons. Glial fibrillary acidic protein (GFAP) was first observed at PC Week 10.0 instead, after the dopaminergic neurotransmitter phenotype expression. In vitro complementary information was obtained: TH-positive cells represented about 3% of the total cell population after a week in culture, based upon accurate anatomical dissection. They tended to form microaggregates and to grow in close contact with glial cells. MesDA neuronal expression of TH activity was measured by a biochemical microassay. TH-positive cells responded to basic fibroblast growth factor (bFGF) both with increased TH activity and neuronal survival. bFGF effects were mediated by the proliferative action on glial cells. Astroglial GFAP-positive cells express nerve growth factor-low-affinity receptor in culture. Information on in vitro and in vivo sequences of mesDA neuronal development and their response to identified neurotrophic molecules may be invaluable for selection of the most appropriate tissue donor age for brain grafting and development of alternative treatment strategies for Parkinson's disease.
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Affiliation(s)
- V Silani
- Dino Ferrari Center-Institute of Neurology, Milan, Italy
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Baraldi A, Colonna F, Frigeri P, Ghezzi C, Parisini A, Gombia E, Mosca R. Low-temperature occupation of a donor state resonant with the conduction band in Al0.35Ga0.65As. Phys Rev B Condens Matter 1993; 48:17835-17840. [PMID: 10008414 DOI: 10.1103/physrevb.48.17835] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Abstract
GangliosideGM1 represents a widespread component of the neural cell plasma membranes. Cholera toxin-B subunit binds selectively to GM1. Human spinal cords at post-conception (PC) weeks 6 to 11 were examined and early GM1 expression shown on the cell plasma membrane in the developing grey matter at PC week 6. GM1 was demonstrated also in the marginal layer (white matter); on neural crest derivative plasma membrane, i.e. dorsal root (DRG) and sympathetic ganglia; along emerging fibres from DRG and neurite terminals innervating skeletal muscle. GangliosideGM1 is highly expressed in spinal cord primary cultures and is a stringent neural cell marker. GangliosideGM1 represents an early marker of neural differentiation in both spinal cord and neural crest derivatives.
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Affiliation(s)
- V Silani
- Dino Ferrari' Centre, Institute of Neurology, University of Milan Medical School, Italy
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Mazziotti F, Cirillo L, Arena V, Cipriani P, Ghezzi C, Bresadola M, Ragni N, Donadio C, Pellizzari G. [Comparative clinical study of a new imidazole molecule (fluconazole) and ketaconazole in the treatment of Candida albicans vulvovaginitis]. Minerva Ginecol 1992; 44:653-9. [PMID: 1491774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A multicentre trial was carried out in Italy with the aim of comparing the efficacy, safety and tolerability of the oral administration of fluconazole with the oral administration of ketoconazole in the treatment of patients affected by Candida vulvovaginitis. A total of 174 patients with symptomatic Candida vulvovaginitis were identified both by objective examination and cell culture tests: of these 87 were treated using a single oral administration of fluconazole (150 mg) whereas the other 87 received 2 200 mg capsules of ketoconazole daily for 5 days. Tests to assess the efficacy, safety and tolerability of both treatments were carried out approximately 7 days and 5-6 weeks from the start of therapy. The results obtained showed a success rate of 92% for fluconazole-treated patients and 83% for those treated with ketoconazole. In addition to the rapid and safe efficacy of treatment, the most important findings which emerged from this study were the extreme simplicity of use, excellent patient compliance and the complete absence of collateral effects of variations in the hematochemical and urine parameters taken into consideration caused by fluconazole.
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Affiliation(s)
- F Mazziotti
- II Clinica di Ostetricia e Ginecologia, Università La Sapienza di Roma
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Baraldi A, Ghezzi C, Parisini A, Bosacchi A, Franchi S. Low-temperature mobility of photoexcited electrons in AlxGa1-xAs containing DX centers. Phys Rev B Condens Matter 1991; 44:8713-8720. [PMID: 9998828 DOI: 10.1103/physrevb.44.8713] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ghezzi C, Dubois F, Mathieu JP, Cand F, Comet M, Cuchet P. Effect of short-term fasting on [123I] iodohexadecenoic acid metabolism in the isolated perfused rat heart. Validation of mathematical model by comparison with experimental measurements. Arch Int Physiol Biochim 1990; 98:269-81. [PMID: 1708995 DOI: 10.3109/13813459009113987] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In order to study metabolic modifications induced by short term fasting and their consequences on the uptake and intracellular fate of fatty acids iodine labelled in omega position, rats undergo a 36h fasting. Hearts are perfused in a Langendorff system with a glucose (11 mM) perfusion medium; [123I] hexadecenoic acid (IHA) is injected as a bolus. A comparison between time-activity curves p.i. demonstrates a much faster activity decrease for the hearts fasted animals. The intracellular analysis shows that short fasting did not significantly increase the myocardial uptake of fatty acids, but decreased the storage and increased the degradation of the fatty acids taken up. Mathematical analysis of the myocardial time-activity curves obtained by external detection provided results comparable to those of intracellular analysis. The coefficients of correlation between the values of the aqueous phases, organic phases and free fatty acids measured by intracellular analysis and calculated with the compartmental model are consistently higher than 0.97. Consequently, this experimental model combined with mathematical analysis of the time-course of myocardial radioactivity after 123IHA administration appears to be very promising method for studying the effects of drugs or variations of energy substrate availability on myocardial fatty-acid metabolism.
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Affiliation(s)
- C Ghezzi
- Laboratoire de Physiologie Cellulaire Cardiaque (URA-CNRS 632), Université Joseph Fourier, Grenoble, France
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Ghezzi C. [The viewpoint of a trade unionist]. G Ital Med Lav 1990; 12:217-8. [PMID: 2152619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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