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Iannone MN, Stucchi S, Turolla EA, Beretta C, Ciceri S, Chinello C, Pagani L, Todde S, Ferraboschi P. Synthesis and automated fluorine-18 radiolabeling of new PSMA-617 derivatives with a CuAAC radiosynthetic approach. J Labelled Comp Radiopharm 2021; 65:48-62. [PMID: 34964165 DOI: 10.1002/jlcr.3959] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 11/15/2021] [Accepted: 12/10/2021] [Indexed: 11/07/2022]
Affiliation(s)
- M N Iannone
- University of Milano-Bicocca, Tecnomed Foundation
| | - S Stucchi
- University of Milano-Bicocca, Tecnomed Foundation
| | - E A Turolla
- University of Milano-Bicocca, Tecnomed Foundation
| | - C Beretta
- University of Milano-Bicocca, Tecnomed Foundation
| | - S Ciceri
- Department of Medical Biotechnologies and Translational Medicine, University of Milano
| | - C Chinello
- Department of Medicine and Surgery, University of Milano-Bicocca
| | - L Pagani
- Department of Medicine and Surgery, University of Milano-Bicocca
| | - S Todde
- Tecnomed Foundation, CNR-IBFM, University of Milano-Bicocca
| | - P Ferraboschi
- Department of Medical Biotechnologies and Translational Medicine, University of Milano
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2
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Todde S, Peitl PK, Elsinga P, Koziorowski J, Ferrari V, Ocak EM, Hjelstuen O, Patt M, Mindt TL, Behe M. Guidance on validation and qualification of processes and operations involving radiopharmaceuticals. EJNMMI Radiopharm Chem 2017; 2:8. [PMID: 29503849 PMCID: PMC5824699 DOI: 10.1186/s41181-017-0025-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [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] [Received: 04/05/2017] [Accepted: 05/23/2017] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND Validation and qualification activities are nowadays an integral part of the day by day routine work in a radiopharmacy. This document is meant as an Appendix of Part B of the EANM "Guidelines on Good Radiopharmacy Practice (GRPP)" issued by the Radiopharmacy Committee of the EANM, covering the qualification and validation aspects related to the small-scale "in house" preparation of radiopharmaceuticals. The aim is to provide more detailed and practice-oriented guidance to those who are involved in the small-scale preparation of radiopharmaceuticals which are not intended for commercial purposes or distribution. RESULTS The present guideline covers the validation and qualification activities following the well-known "validation chain", that begins with editing the general Validation Master Plan document, includes all the required documentation (e.g. User Requirement Specification, Qualification protocols, etc.), and leads to the qualification of the equipment used in the preparation and quality control of radiopharmaceuticals, until the final step of Process Validation. CONCLUSIONS A specific guidance to the qualification and validation activities specifically addressed to small-scale hospital/academia radiopharmacies is here provided. Additional information, including practical examples, are also available.
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Affiliation(s)
- S. Todde
- University of Milano-Bicocca, Tecnomed Foundation, 20900 Monza, Italy
| | - P. Kolenc Peitl
- Department of Nuclear Medicine, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia
| | - P. Elsinga
- University Medical Center Groningen, University of Groningen, 9700 RB Groningen, The Netherlands
| | - J. Koziorowski
- Department of Radiology and Department of Medical and Health Sciences, Linköping University, Linköping, Sweden
| | | | - E. M. Ocak
- Faculty of Pharmacy, Department of Pharmaceutical Technology, Istanbul University, 34116 Beyazit, Istanbul Turkey
| | - O. Hjelstuen
- Institute for Energy Technology, Instituttveien 18, PO Box 40, 2027 Kjeller, Norway
| | - M. Patt
- Department for Nuclear Medicine, Radiochemistry, Liebigstrasse 18, 04103 Leipzig, Germany
| | - T. L. Mindt
- Ludwig Boltzmann Institute Applied Diagnostics, General Hospital Vienna, Nuklearmedizin, Vienna, Austria
- Department of Biomedical Imaging and Image Guided Therapy, Division of Nuclear Medicine, Medical University of Vienna, Vienna, Austria
| | - M. Behe
- Center for Radiopharmaceutical Sciences ETH-PSI-USZ Paul-Scherrer-Institute, 5232 Villigen-PSI, Switzerland
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Lugato B, Stucchi S, Ciceri S, Iannone MN, Turolla EA, Giuliano L, Chinello C, Todde S, Ferraboschi P. A novel versatile precursor suitable for 18 F-radiolabeling via "click chemistry". J Labelled Comp Radiopharm 2017; 60:466-480. [PMID: 28600889 DOI: 10.1002/jlcr.3529] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 03/03/2017] [Revised: 06/07/2017] [Accepted: 06/07/2017] [Indexed: 11/06/2022]
Abstract
As an effort to improve 18 F-radiolabeling of biomolecules in method robustness and versatility, we report the synthesis and radiolabeling of a new azido precursor potentially useful for the so-called "click reaction," in particular the ligand-free version of the copper(I)-catalyzed alkyne-azide cycloaddition. The new azido precursor may help to overcome problems sometimes exhibited by most of the currently used analogues, as it is safe to handle and it displays long-term chemical stability, thus facilitating the development of new radiolabeling procedures. Moreover, the formed 18 F-labeled 1,2,3-triazole is potentially metabolically stable and could enhance the in vivo circulation time. The above azido precursor was successfully radiolabeled with 18 F, with 51% radiochemical yield (nondecay-corrected). As a proof of concept, the 18 F-labeled azide was then tested with a suitable alkyne functionalized aminoacid (l-propargylglycine), showing 94% of conversion, and a final radiochemical yield of 27% (>99% radiochemical purity), nondecay-corrected, with a total preparation time of 104 minutes.
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Affiliation(s)
- B Lugato
- Department of Medicine and Surgery, Tecnomed Foundation, University of Milano-Bicocca, Monza, Italy
| | - S Stucchi
- Department of Medicine and Surgery, Tecnomed Foundation, University of Milano-Bicocca, Monza, Italy
| | - S Ciceri
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, Milan, Italy
| | - M N Iannone
- Department of Medicine and Surgery, Tecnomed Foundation, University of Milano-Bicocca, Monza, Italy
| | - E A Turolla
- Department of Medicine and Surgery, Tecnomed Foundation, University of Milano-Bicocca, Monza, Italy
| | - L Giuliano
- Department of Medicine and Surgery, Tecnomed Foundation, University of Milano-Bicocca, Monza, Italy
| | - C Chinello
- Department of Medicine and Surgery, Mass Spectrometry Unit, University of Milano-Bicocca, Monza, Italy
| | - S Todde
- Department of Medicine and Surgery, Tecnomed Foundation, University of Milano-Bicocca, Monza, Italy
| | - P Ferraboschi
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, Milan, Italy
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Koziorowski J, Behe M, Decristoforo C, Ballinger J, Elsinga P, Ferrari V, Kolenc Peitl P, Todde S, Mindt TL. Position paper on requirements for toxicological studies in the specific case of radiopharmaceuticals. EJNMMI Radiopharm Chem 2016; 1:1. [PMID: 29564378 PMCID: PMC5843800 DOI: 10.1186/s41181-016-0004-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Accepted: 02/11/2016] [Indexed: 11/18/2022] Open
Abstract
This is a position paper of the Radiopharmacy Committee of the EANM
(European Association of Nuclear Medicine) addressing toxicology studies for
application of new diagnostic and therapeutic radiopharmaceuticals (RP) that are not
approved (i.e., not having a marketing authorization or a monograph in the European
Pharmacopoeia), excluding endogenous and ubiquitous substances in humans. This paper
discusses the requirements for clinical trials with radiopharmaceuticals for
clinical research applications, not necessarily intended to aim at a marketing
authorization. If marketing authorization is intended, scientific advice of the
competent authorities is mandatory and cannot be replaced by this position paper.
The position paper reflects the view of the Radiopharmacy Committee of the EANM and
can be used as a basis for discussions with the responsible authorities.
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Affiliation(s)
- J Koziorowski
- Department of Radiation Physics and Department of Medical and Health Sciences, Linköping University, Linköping, Sweden
| | - M Behe
- Center for Radiopharmaceutical Sciences ETH-PSI-USZ Paul-Scherrer-Institute, 5232 Villigen-PSI, Switzerland
| | - C Decristoforo
- Department of Nuclear Medicine, Medical University Innsbruck, 6020 Innsbruck, Austria
| | - J Ballinger
- Guy's and St Thomas' Hospital, London, SE1 9RT UK
| | - P Elsinga
- University Medical Center, University of Groningen, 9700 RB Groningen, Netherlands
| | | | - P Kolenc Peitl
- University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia
| | - S Todde
- Università di Milano-Bicocca, Tecnomed Foundation, 20090 Monza, Italy
| | - T L Mindt
- University of Basel Hospital, Radiopharmaceutical Chemistry, 4031 Basel, Switzerland
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Matarrese M, Salimbeni A, Turozzi D, Poma D, Turolla E, Todde S, Magni F, Soloviev D, Carpinelli A, Kienle MG, Fazio F. Radiosyntesis of the ace inhibitor [11C]zofenoprilat. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.25804401135] [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] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Calandrino R, del Vecchio A, Parisi R, Todde S, De Felice P, Savi A, Pepe A, Mrskova A. Measurements and evaluation of the risks due to external radiation exposures and to intake of activated elements for operational staff engaged in the maintenance of medical cyclotrons. Radiat Prot Dosimetry 2010; 139:477-482. [PMID: 20028699 DOI: 10.1093/rpd/ncp283] [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] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The aim of this paper is to assess the activation phenomena and to evaluate the risk of external exposure and intake doses for the maintenance staff of two medical cyclotrons. Two self-shielded cyclotrons are currently operating in the facility for the routine production of (11)C and (18)F. Four radiochemistry laboratories are linked to the cyclotrons by means of shielded radioisotope delivery lines. Radiopharmaceuticals are prepared both for the PET Diagnostic Department, where four CT-PET scanners are operating with a mean patient workload of 40 d(-1) and for [(18)F]FDG external distribution, to provide radiopharmaceuticals for other institutions. In spite of the fact that air contamination inside the radiochemistry laboratories during the synthesis represents the largest 'slice of the pie' in the evaluation of annual intake dose, potential contamination due to the activated particulate, generated during cyclotron irradiation by micro-corrosion of targets and other components potentially struck by the proton beam and generated neutrons, should be considered. In this regard, the most plausible long-lived (T(1/2) > 30 d) radioisotopes formed are: (97)Tc, (56)Co, (57)Co, (58)Co, (60)Co, (49)V, (55)Fe, (109)Cd, (65)Zn and (22)Na. The results for the operating personnel survey has revealed only low-level contamination for (65)Zn in one test, together with minor (18)F intake, probably due to the environmental dispersion of the radioisotope during the [(18)F]FDG synthesis.
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Affiliation(s)
- R Calandrino
- Medical Physics Department, IRCCS San Raffaele, Milano, Italy.
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Moresco RM, Lavazza T, Belloli S, Lecchi M, Pezzola A, Todde S, Matarrese M, Carpinelli A, Turolla E, Zimarino V, Popoli P, Malgaroli A, Fazio F. Quinolinic acid induced neurodegeneration in the striatum: a combined in vivo and in vitro analysis of receptor changes and microglia activation. Eur J Nucl Med Mol Imaging 2007; 35:704-15. [PMID: 18080815 DOI: 10.1007/s00259-007-0651-7] [Citation(s) in RCA: 22] [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] [Received: 07/30/2007] [Accepted: 11/04/2007] [Indexed: 10/22/2022]
Abstract
PURPOSE Huntington's disease (HD) is a progressive neurodegenerative disorder, which is characterised by prominent neuronal cell loss in the basal ganglia with motor and cognitive disturbances. One of the most well-studied pharmacological models of HD is produced by local injection in the rat brain striatum of the excitotoxin quinolinic acid (QA), which produces many of the distinctive features of this human neurodegenerative disorder. Here, we report a detailed analysis, obtained both in vivo and in vitro of this pharmacological model of HD. MATERIALS AND METHODS By combining emission tomography (PET) with autoradiographic and immunocytochemical confocal laser techniques, we quantified in the QA-injected striatum the temporal behavior (from 1 to 60 days from the excitotoxic insult) of neuronal cell density and receptor availability (adenosine A(2A) and dopamine D(2) receptors) together with the degree of microglia activation. RESULTS Both approaches showed a loss of adenosine A(2A) and dopamine D(2) receptors paralleled by an increase of microglial activation. CONCLUSION This combined longitudinal analysis of the disease progression, which suggested an impairment of neurotransmission, neuronal integrity and a reversible activation of brain inflammatory processes, might represent a more quantitative approach to compare the differential effects of treatments in slowing down or reversing HD in rodent models with potential applications to human patients.
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Affiliation(s)
- R M Moresco
- IBFM-CNR, University of Milan Bicocca, Nuclear Medicine Department, San Raffaele Scientific Institute, Milano, Italy.
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Calandrino R, del Vecchio A, Todde S, Fazio F. Measurement and control of the air contamination generated in a medical cyclotron facility for PET radiopharmaceuticals. Health Phys 2007; 92:S70-7. [PMID: 17440326 DOI: 10.1097/01.hp.0000253941.56400.76] [Citation(s) in RCA: 5] [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] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The aim of this paper is to report the data concerning the contamination of the exhausted air from the hot cells dedicated to the large-scale synthesis of positron emission tomography (PET) radiopharmaceuticals. Two cyclotrons are currently operating in Ospedale San Raffaele for the routine production of C and F. They are linked with four radiochemistry laboratories by means of shielded radioisotope delivery lines. The above labs are dedicated both to the large scale preparation and to the research and development of PET radiopharmaceuticals. The department hosts four CT-PET scanners, which operate with a mean patient workload of 40 per day. Radiosyntheses are performed using automated modules located in 10 hot cells. The air outlets are monitored online by a 2-inch NaI(Tl) counter in a Marinelli geometry counting volume. Contamination values up to 10(5) Bq L(-1) have been measured at the hot cell exit point during the synthesis. The corresponding concentrations at the point of release in atmosphere are largely above the threshold of 1.29 Bq L(-1), defined by national regulations as the limit for free environmental release. A shielded gas storage system controlled by a dedicated, customized software program has thus been installed to prevent the potentially hazardous release of gaseous radioactive contaminants. The system has allowed us to maintain the effective dose to neighboring population groups below the limit of 10 muSv y(-1).
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Affiliation(s)
- R Calandrino
- Health Physics Department, Ospedale San Raffaele, via Olgettina, 60, 20132 Milano, Italy
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Calandrino R, del Vecchio A, Savi A, Todde S, Griffoni V, Brambilla S, Parisi R, Simone G, Fazio F. Decommissioning procedures for an 11 MeV self-shielded medical cyclotron after 16 years of working time. Health Phys 2006; 90:588-96. [PMID: 16691108 DOI: 10.1097/01.hp.0000190161.96172.ae] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The present article describes the decommissioning of a compact, self-shielded, 11 MeV medical cyclotron. A Monte Carlo simulation of the possible nuclear reactions was performed in order to plan the decommissioning activities. In the course of the cyclotron dismantling, cyclotron components, shields, and floor concrete samples were measured. Residual activities were analyzed with a Ge(Li) detector and compared with simulation data. Doses to staff involved in the decommissioning procedure were monitored by individual TL dosimeters. The simulations identified five radioactive nuclides in shields and floor concrete: 55Fe and 45Ca (beta emitters, total specific activity: 2.29 x 10(4) Bq kg) and 152Eu, 154Eu, 60Co (gamma emitters, total specific activity: 1.62 x 10(3) Bq kg-1). Gamma-ray spectrometry confirmed the presence of gamma emitters, corresponding to a total specific activity of 3.40 x 10(2) Bq kg-1. The presence of the radioisotope 124Sb in the lead contained in the shield structure, corresponding to a simulated specific activity of 9.38 x 10(3) Bq kg-1, was experimentally confirmed. The measured dose from external exposure of the involved staff was <20 muSv, in accordance with the expected range of values between 10 and 20 muSv. The measured dose from intake was negligible. Finally, the decommissioning of the 11 MeV cyclotron does not represent a risk for the involved staff, but due to the presence of long-lived radioisotopes, the cyclotron components are to be treated as low level radioactive waste and stored in an authorized storage area.
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Affiliation(s)
- R Calandrino
- Health Physics Department, Servizio di Fisica Sanitaria, IRCCS San Raffaele, Via Olgettina 60, 20132 Milan, Italy.
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Carpinelli A, Magni F, Cattaneo A, Matarrese M, Turolla E, Todde S, Bosso N, Galli Kienle M, Fazio F. Improved synthesis and radiolabeling of [11C]MP4A, a suitable ligand for the investigation of the cholinergic system using PET. Appl Radiat Isot 2006; 64:182-6. [PMID: 16169239 DOI: 10.1016/j.apradiso.2005.07.014] [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] [Received: 02/21/2005] [Revised: 07/12/2005] [Accepted: 07/18/2005] [Indexed: 11/18/2022]
Abstract
An improved synthesis of the precursor acetic acid-piperidine-4-yl ester by acetylation of 4-hydroxypiperidine hydrochloride in anhydrous chloroform was developed. A procedure for fast evaluation and characterization of products originated by acetylation of the 4-piperidinol using LC-APCI/MS with an acetonitrile-water gradient method on a Merck Purosphere RP-18 column was also developed. The highly purified precursor allowed the production of [11C]MP4A for PET studies of acetylcholine neurotransmission system. The tracer was produced with >98% radiochemical purity, with yields ranging 20-60% (decay-corrected) from EOB.
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Affiliation(s)
- A Carpinelli
- IBFM-CNR, Scientific Institute, University of Milano Bicocca, H. S. Raffaele, Via Olgettina 60, 20132 Milano, Italy.
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Moresco RM, Belloli S, Todde S, Matarrese M, Carpinelli A, Turolla E, Popoli P, Pèzzola A, Carpinelli A, Lecchi M, Simonelli P, Fazio F. Longitudinal evaluation of a preclinical model of Huntington disease using molecular imaging techniques and selected radioligands. Neuroimage 2006. [DOI: 10.1016/j.neuroimage.2006.04.024] [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: 10/24/2022] Open
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Moresco RM, Todde S, Belloli S, Simonelli P, Panzacchi A, Rigamonti M, Galli-Kienle M, Fazio F. In vivo imaging of adenosine A2A receptors in rat and primate brain using [11C]SCH442416. Eur J Nucl Med Mol Imaging 2004; 32:405-13. [PMID: 15549298 DOI: 10.1007/s00259-004-1688-5] [Citation(s) in RCA: 54] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2004] [Accepted: 08/20/2004] [Indexed: 11/27/2022]
Abstract
PURPOSE The aim of this study was to evaluate the suitability of [11C]SCH442416 for the in vivo imaging of adenosine A2A receptors. METHODS In rats and Macaca nemestrina, we evaluated the time course of the cerebral distribution of [11C]SCH442416. Furthermore, in rats we investigated the rate of metabolic degradation, the inhibitory effects of different drugs acting on adenosine or dopamine receptors and the modification induced by the intrastriatal administration of quinolinic acid (QA). RESULTS The rate of metabolic degradation of [11C]SCH442416 in rats was slow; 60 min after tracer injection, more than 40% of total plasma activity was due to unmetabolised [11C]SCH442416. At the time of maximum uptake, radioactive metabolites represented only 6% of total extractable activity in the cerebellum and less than 1% in the striatum. In the striatum, the region with the highest expression of A2A receptors, the in vivo uptake of [11C]SCH442416 was significantly reduced only by drugs acting on A2A receptors or by QA, a neurotoxin that selectively reduces the number of intrastriatal GABAergic neurons. Position emission tomography (PET) studies in monkeys indicated that the tracer rapidly accumulates in brain, reaching maximum uptake between 5 and 10 min. Twenty minutes after the injection, radioactivity concentration in the striatum was two times that in the cerebellum. CONCLUSION The specificity of binding, the rank order of regional distribution in the brain of rats and M. nemestrina, the good signal to noise ratios and the low amount of radioactive metabolites in brain and periphery indicate that [11C]SCH442416 is a promising tracer for the in vivo imaging of A2A adenosine receptors using PET.
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Affiliation(s)
- R M Moresco
- IBFM-CNR, University of Milan-Bicocca, Scientific Institute H San Raffaele, Milan, Italy.
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Abstract
Emission tomography techniques and, in particular, positron emission tomography (PET) enable the in vivo study of several physiological and neurochemical variables in human subjects using methods originally developed for quantitative autoradiography. In particular, PET allows one to evaluate in human subjects: (a) the effect of specific neurochemical challenges on regional brain function at rest or under activation; (b) the activity of neurotransmitters and the regional expression of specific molecular targets during pathology including their modulation by drug treatment; (c) the kinetics of drug disposition and activity directly in the target organ. This is of primary interest in the field of biological psychiatry and in psychoactive drugs development, where it is particularly difficult to reproduce human diseases using animal models in view of the peculiarity of this field and the large heterogeneity of each psychiatric illness also inside the same clinical definition. The aim of this paper is to review the principal strategies and the main results of the use of PET in psychopharmacology.
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Affiliation(s)
- R Maria Moresco
- INB-CNR, Scientific Institute H San Raffaele, University of Milan-Bicocca, Italy.
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Carpinelli A, Todde S, Matarrese M, Moresco RM, Dosio F, Wollmer P, Magni F, Kienle MG, Fazio F. An optimized semiautomatic method for labelling of palmitic acid with [11C]CO2. J Labelled Comp Radiopharm 2001. [DOI: 10.1002/jlcr.25804401356] [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: 11/09/2022]
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Matarrese M, Moresco RM, Cappelli A, Anzini M, Vomero S, Simonelli P, Verza E, Magni F, Sudati F, Soloviev D, Todde S, Carpinelli A, Kienle MG, Fazio F. Labeling and evaluation of N-[11C]methylated quinoline-2-carboxamides as potential radioligands for visualization of peripheral benzodiazepine receptors. J Med Chem 2001; 44:579-85. [PMID: 11170647 DOI: 10.1021/jm001004h] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [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
The novel quinoline-2-carboxamide derivatives N-[methyl-11C]-3-methyl-4-phenyl-N-(phenylmethyl)quinoline-2-carboxamide ([11C]4), (+/-)-N-[methyl-11C]-3-methyl-N-(1-methylpropyl)-4-phenylquinoline-2-carboxamide ([11C]5), and (+/-)-N-[methyl-11C]-3-methyl-4-(2-fluorophenyl)-N-(1-methylpropyl)quinoline-2-carboxamide ([11C]6) were labeled with carbon-11 (t1/2 = 20.4 min, beta+ = 99.8%) as potential radioligands for the noninvasive assessment of peripheral benzodiazepine type receptors (PBR) in vivo with positron emission tomography (PET). The radiosynthesis consisted of N-methylation of the desmethyl precursors 3-methyl-4-phenyl-N-(phenylmethyl)quinoline-2-carboxamide (4a), (+/-)-3-methyl-N-(1-methylpropyl)-4-phenylquinoline-2-carboxamide (5a), and (+/-)-4-(2-fluorophenyl)-3-methyl-N-(1-methylpropyl)quinoline-2-carboxamide (6a) with either [11C]methyl iodide or [11C]methyl triflate in the presence of tetrabutylammonium hydroxide or potassium hydroxide in dimethylformamide. The radioligands [11C]4, [11C]5, and [11C]6 were synthesized with over 99% radiochemical purity in 30 min, 30 +/- 5% radiochemical yield, calculated at the end of synthesis (EOS) non-decay-corrected, and 2.5 +/- 1.2 Ci/micromol of specific radioactivity. Inhibition studies in rats following intravenous pre-administration of 1-(2-chlorophenyl)-N-methyl-N-(1-methylpropyl)-3-isoquinolinecarboxamide (PK 11195, 1) showed high specific binding to PBR of [11C]4, [11C]5, and [11C]6 in heart, lung, kidney, adrenal gland, spleen, and brain. The biological data suggest that [11C]5, [11C]6, and particularly [11C]4 are promising radioligands for PBR imaging in vivo with PET.
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Affiliation(s)
- M Matarrese
- INB-CNR, University of Milano/Bicocca, Institute H.S. Raffaele, Via Olgettina 60, 20132 Milano, Italy
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Soloviev DV, Matarrese M, Moresco RM, Todde S, Bonasera TA, Sudati F, Simonelli P, Magni F, Colombo D, Carpinelli A, Kienle MG, Fazio F. Asymmetric synthesis and preliminary evaluation of (R)- and (S)-[11C]bisoprolol, a putative beta1-selective adrenoceptor radioligand. Neurochem Int 2001; 38:169-80. [PMID: 11137886 DOI: 10.1016/s0197-0186(00)00049-8] [Citation(s) in RCA: 24] [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: 10/18/2022]
Abstract
(+/-)-1-[4-(2-Isopropoxyethoxymethyl)-phenoxy]-3-isopropylamino-2-propanol (bisoprolol) is a potent, clinically used beta(1)-adrenergic agent. (R)-(+) and (S)-(-) enantiomers of bisoprolol were labelled with carbon-11 (t(1/2)=20.4 min) as putative tracers for the non-invasive assessment of the beta(1)-adrenoceptor subtype in the human heart and brain with positron emission tomography (PET). The radiosynthesis consisted of reductive alkylation of des-iso-propyl precursor with [2-11C]acetone in the presence of sodium cyanoborohydride and acetic acid. The stereo-conservative synthesis of (R)-(+) and (S)-(-)-1-[4-(2-isopropoxyethoxymethyl)-phenoxy]-3-amino-2-propanol to be used as the precursors for the radiosynthesis of [11C]bisoprolol enantiomers was readily accomplished by the use of the corresponding chiral epoxide in three steps starting from the commercially available hydroxybenzyl alcohol. The final labelled product (either (+) or (-)-1-[4-(-isopropoxyethoxymethyl)-phenoxy]-3- [11C]isopropylamino-2-propanol) was obtained in 99% radiochemical purity in 30 min with 15+/-5% (EOS, non-decay corrected) radiochemical yield and 3.5+/-1 Ci/micromol specific radioactivity. Preliminary biological evaluation of the tracer in rats showed that about 30% of heart uptake of [11C](S)-bisoprolol is due to specific binding. The high non-specific uptake in lung might mask the heart uptake, thus precluding the use of [11C](S)-bisoprolol for heart and lung studies by PET. The remarkably high uptake of the tracer in rat brain areas rich of beta-adrenergic receptors such as pituitary (1.8+/-0.3% I.D. at 30 min) was blocked by pre-treatment with the beta-adrenergic antagonists propranolol (45%) and bisoprolol (51%, p<0.05). [11C](S)-bisoprolol deserves further evaluation in other animal models as a putative beta(1) selective radioligand for in vivo investigation of central adrenoceptors.
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Carpinelli A, Matarrese M, Moresco RM, Simonelli P, Todde S, Magni F, Galli Kienle M, Fazio F. Radiosynthesis of [123I]betaCIT, a selective ligand for the study of the dopaminergic and serotoninergic systems in human brain. Appl Radiat Isot 2001; 54:93-5. [PMID: 11144258 DOI: 10.1016/s0969-8043(00)00179-2] [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: 10/18/2022]
Abstract
The procedure previously reported for the radiosynthesis of [123I]betaCIT was modified in order to improve both radiochemical yield and purity of betaCIT (2beta-carbomethoxy-3beta(4-iodophenyl) tropane) to be injected for SPECT (Single Photon Emission Computed Tomography) analysis imaging. The overall procedure, involving a HPLC purification step, results in quite good and reproducible yields of a highly purified tracer.
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Affiliation(s)
- A Carpinelli
- CNR-INB, University of Milano-Bicocca, Scientific Institute H San Raffaele, Milan, Italy
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Todde S, Moresco RM, Simonelli P, Baraldi PG, Cacciari B, Spalluto G, Varani K, Monopoli A, Matarrese M, Carpinelli A, Magni F, Kienle MG, Fazio F. Design, radiosynthesis, and biodistribution of a new potent and selective ligand for in vivo imaging of the adenosine A(2A) receptor system using positron emission tomography. J Med Chem 2000; 43:4359-62. [PMID: 11087559 DOI: 10.1021/jm0009843] [Citation(s) in RCA: 76] [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: 11/28/2022]
Affiliation(s)
- S Todde
- CNR-INB, University of Milano-Bicocca, Scientific Institute H San Raffaele, Via Olgettina 60, I-20132 Milano, Italy
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Moresco RM, Matarrese M, Soloviev D, Simonelli P, Rigamonti M, Gobbo C, Todde S, Carpinelli A, Kienle MG, Fazio F. Synthesis and in vivo evaluation of [11C]ICI 118551 as a putative subtype selective beta2-adrenergic radioligand. Int J Pharm 2000; 204:101-9. [PMID: 11011992 DOI: 10.1016/s0378-5173(00)00480-4] [Citation(s) in RCA: 9] [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] [Indexed: 10/18/2022]
Abstract
Erytro-(+/-)-1-[2,3-(dihydro-7-methyl-1H-inden-4-yl)oxy]-3-[ iso-propylamino]-2-butanol (ICI 118551) a potent clinically used beta2 adrenergic antagonist, was labelled with carbon-11 (t1/2 = 20.4 min) as a potential radioligand for the non-invasive assessment of beta2 adrenergic receptors in the lung with positron emission tomography (PET). The radiolabelled compound was prepared by reductive N-alkylation of its des-isopropyl precursor with [2-11C]acetone. (+/-)-[11C]ICI 118551 was obtained in greater than 98% radiochemical purity in 30 min with a radiochemical yield of 15 + 5% (non-decay corrected) and a specific radioactivity 2.5 +/- 0.5 Ci/micromol. The biological evaluation of racemic erythro (+/-)-[11C]ICI 118551 in rats and Macaca Nemestrina shows a high radioactivity uptake in lung and heart. However, in both animal models no detectable displacement of lung radioactivity concentration was observed after pre-treatment with propranolol or ICI 118551, which indicates that in this organ, radioligand uptake is mostly due to non-specific binding. The biological data suggest that erythro (+/-)-[11C]ICI 118551 is not adequate to be further developed as a tracer for beta2 adrenergic receptor imaging in vivo.
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Affiliation(s)
- R M Moresco
- INB-CNR, University of Milano-Bicocca, Institute H.S. Raffaele, Milan, Italy
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Todde S, Moresco RM, Fröstl W, Stampf P, Matarrese M, Carpinelli A, Magni F, Galli Kienle M, Fazio F. Synthesis and in vivo evaluation of [(11)C]CGP62349, a new GABA(B) receptor antagonist. Nucl Med Biol 2000; 27:565-9. [PMID: 11056370 DOI: 10.1016/s0969-8051(00)00124-4] [Citation(s) in RCA: 10] [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] [Indexed: 10/27/2022]
Abstract
This paper describes the radiosynthesis of [(11)C]CGP62349, a potential ligand to assess GABA(B) receptors in vivo. (11)C was introduced by O-methylation of the corresponding des-methyl precursor, namely CGP67780. The final product was obtained with a reliable method in good yield. The radioligand was tested in monkey, revealing negligible blood-brain barrier penetration and brain uptake, thus prompting us to search for a new target structure with a better lipophilicity.
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Affiliation(s)
- S Todde
- CNR-INB, University of Milano-Bicocca, Scientific Institute H San Rafaele, Via Olgettina 60, Milano, Italy.
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Matarrese M, Soloviev D, Moresco RM, Todde S, Simonelli P, Colombo D, Magni F, Carpinelli A, Fazio F, Kienle MG. Synthesis and in vivo evaluation of 3-[11C]methyl-(3-methoxy-naphthalen)-2-yl-(1-benzyl-piperidin)-4-yl-acetate (SB-235753), as a putative dopamine D4 receptors antagonist for PET. J Labelled Comp Radiopharm 2000. [DOI: 10.1002/(sici)1099-1344(20000330)43:4<359::aid-jlcr323>3.0.co;2-v] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
Carbon-11 labeled acetone is a useful radiosynthetic precursor. Previously, strict control of no-carrier-added stoichiometry was required to prepare it from reaction of CO2 and methyl lithium. However, excess methyl lithium may be selectively quenched to avoid reaction with nascent acetone to give tert-butanol. We report a simple pKa-based strategy to sequentially and selectively quench MeLi and acetone to give yields of up to 100% acetone even in the presence of a large excess of MeLi. The method gives good yields of acetone under conditions that previously precluded its synthesis.
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Affiliation(s)
- A R Studenov
- Department of Chemistry, Case Western Reserve University and University Hospitals of Cleveland, Ohio 44106, USA
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Matarrese M, Soloviev D, Todde S, Magni F, Colombo D, Galli Kienle M, Fazio F. Synthesis of [O-methyl-11C]fluvoxamine--a potential serotonin uptake site radioligand. Appl Radiat Isot 1997; 48:749-54. [PMID: 9204526 DOI: 10.1016/s0969-8043(96)00304-1] [Citation(s) in RCA: 7] [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: 02/04/2023]
Abstract
5-Methoxy-1-[4-(trifluoromethyl)-phenyl]-1-pentanone-O-(2-aminoethyl)oxi me (fluvoxamine), a potent clinically used antidepressant, was labelled with carbon-11 (t1/2 = 20.4 min) as a potential radioligand for the non-invasive assessment of serotonin uptake sites in the human brain with positron emission tomography (PET). The two-step radiochemical synthesis consisted of O-methylation of an amino-protected desmethyl precursor with [11C]methyl iodide under mild conditions in the presence of tetrabutylammonium hydroxide in acetonitrile, followed by deprotection with trifluoroacetic acid. 5-[11C]Methoxy-1-[4-(trifluoromethyl)-phenyl]-1-pentanone-O-(2-aminoethy l) oxime was obtained in > 98% radiochemical purity in 40 min with a radiochemical yield of 4 +/- 2% (non-decay corrected) and a specific radioactivity of 1 +/- 0.5 Ci/mumol. 5-Hydroxy-1-[4-(trifluoromethyl)-phenyl]-1-pentanone-O-[2- (tert-butoxycarbonylamino)ethyl]oxime, the precursor for the radiosynthesis of [11C]fluvoxamine, was prepared by a convenient three-step synthesis from the pharmaceutical form of fluvoxamine maleate by converting it into the free base, demethylation by trimethyliodosilane and introduction of the BOC-protective group with di-tert-butyl dicarbonate.
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Affiliation(s)
- M Matarrese
- CNR-INB, University of Milan, Institute H.S. Raffaele, Italy
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Cappa SF, Perani D, Grassi F, Bressi S, Alberoni M, Franceschi M, Bettinardi V, Todde S, Fazio F. A PET follow-up study of recovery after stroke in acute aphasics. Brain Lang 1997; 56:55-67. [PMID: 8994698 DOI: 10.1006/brln.1997.1737] [Citation(s) in RCA: 105] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The neural correlates of recovery from aphasia are largely unknown. Several different sources of evidence, from clinical studies to neurophysiological investigations, have suggested a contribution of the contralateral, undamaged hemisphere in recovery from aphasia. Eight patients with unilateral left hemispheric stroke were submitted to a standard language examination and to a [18F]FDG PET study in the recent phase after stroke (within 2 weeks) and 6 months later. All patients had a substantial recovery of specific aspects of language functions at the follow-up. Analysis of regional glucose metabolism showed hypometabolism in structurally unaffected regions both in the left and in the right hemisphere (diaschisis), in the acute stage. Glucose metabolism increased significantly on both sides in all patients at the second PET study. Regional analysis showed significant positive correlations between changes in metabolic values in several cortical and subcortical regions in the right hemisphere and changes in language performance at follow-up. The present findings show that an extensive, bihemispheric depression of metabolism is found in the acute stage after stroke in aphasic patients. Language recovery in the first months after aphasia onset is associated with regression of functional depression (diaschisis) in structurally unaffected regions, in particular in the right hemisphere.
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Affiliation(s)
- S F Cappa
- Department of Neurology, University of Brescia, Italy
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Moresco RM, Casati R, Lucignani G, Carpinelli A, Schmidt K, Todde S, Colombo F, Fazio F. Systemic and cerebral kinetics of 16 alpha [18F]fluoro-17 beta-estradiol: a ligand for the in vivo assessment of estrogen receptor binding parameters. J Cereb Blood Flow Metab 1995; 15:301-11. [PMID: 7860663 DOI: 10.1038/jcbfm.1995.35] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [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: 01/27/2023]
Abstract
Estrogen receptors are expressed in several brain areas of various animal species, and steroid hormones exert physiologic and biochemical effects on the central nervous system. The aim of the present study was to evaluate in female adult rats, the suitability of 16 alpha [18F]fluoro-17 beta-estradiol ([18F]FES), a selective estrogen receptor ligand, for the in vivo assessment of brain estrogen receptors. This was considered to be a preliminary step in evaluating the potential usefulness of [18F]FES for studies of cerebral estrogen receptors with positron emission tomography (PET) in nonhuman primates and human subjects. We evaluated (a) the time course of the metabolic degradation of [18F]FES in blood; (b) the time course of distribution of the tracer in discrete cerebral areas; (c) the inhibitory effect of increasing doses of cold estradiol on cerebral [18F]FES uptake; and (d) the possibility of in vivo quantification of estrogen receptor binding parameters using both equilibrium and dynamic kinetic analyses. We quantified [18F]FES binding to estrogen receptors using both equilibrium and dynamic kinetic analyses. The results of this study indicate that [18F]FES is a suitable tracer for the measurement of estrogen receptors in the pituitary and hypothalamus, using either the equilibrium or the kinetic analysis. However, [18F]FES is inadequate for the in vivo investigation of estrogen binding sites in brain areas with low receptor density, such as the hippocampus.
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Affiliation(s)
- R M Moresco
- Department of Nuclear Medicine, University of Milan, Institute H. San Raffaele, Italy
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