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https://www.readbyqxmd.com/read/28654386/dual-energy-spect-and-the-development-of-peptide-p5-14-for-imaging-amyloidosis
#1
Jonathan S Wall, Stephen J Kennel, Emily B Martin
Amyloidosis is associated with a number of rare diseases and is characterized by the deposition, in abdominothoracic organs and peripheral nerves, of extracellular protein fibrils, which leads to dysfunction and severe morbidity. Effective clinical evaluation and management of patients with systemic amyloidosis are hampered by the lack of a noninvasive, quantitative method for detecting whole-body amyloid load. We have used a battery of assays including dual-energy SPECT imaging and comparative effectiveness studies in support of translation of a synthetic polybasic peptide, p5+14, as a novel radiotracer for visualization of amyloidosis by molecular imaging...
January 1, 2017: Molecular Imaging
https://www.readbyqxmd.com/read/28069541/a-bispecific-tribody-pet-radioligand-for-visualization-of-amyloid-beta-protofibrils-a-new-concept-for-neuroimaging
#2
Stina Syvänen, Xiaotian T Fang, Greta Hultqvist, Silvio R Meier, Lars Lannfelt, Dag Sehlin
Antibodies are highly specific for their target molecules, but their poor brain penetrance has restricted their use as PET ligands for imaging of targets within the CNS. The aim of this study was to develop an antibody-based radioligand, using the Tribody(TM) format, for PET imaging of soluble amyloid-beta (Aβ) protofibrils, which are suggested to cause neurodegeneration in Alzheimer's disease. Antibodies, even when expressed in smaller engineered formats, are large molecules that do not enter the brain in sufficient amounts for imaging purposes...
January 6, 2017: NeuroImage
https://www.readbyqxmd.com/read/28059103/radioiodinated-capsids-facilitate-in-vivo-non-invasive-tracking-of-adeno-associated-gene-transfer-vectors
#3
P Kothari, B P De, B He, A Chen, M J Chiuchiolo, D Kim, A Nikolopoulou, A Amor-Coarasa, J P Dyke, H U Voss, S M Kaminsky, C P Foley, S Vallabhajosula, B Hu, S G DiMagno, D Sondhi, R G Crystal, J W Babich, D Ballon
Viral vector mediated gene therapy has become commonplace in clinical trials for a wide range of inherited disorders. Successful gene transfer depends on a number of factors, of which tissue tropism is among the most important. To date, definitive mapping of the spatial and temporal distribution of viral vectors in vivo has generally required postmortem examination of tissue. Here we present two methods for radiolabeling adeno-associated virus (AAV), one of the most commonly used viral vectors for gene therapy trials, and demonstrate their potential usefulness in the development of surrogate markers for vector delivery during the first week after administration...
January 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/27989550/pet-imaging-for-thyroid-cancers-current-status-and-future-directions
#4
REVIEW
Anne-Laure Giraudet, David Taïeb
Positron emission tomography-computed tomography (PET/CT) combines both functional and anatomic information and provides in vivo molecular information on biological processes that can be useful at different steps of evolution of thyroid cancers. (18)Fluorodeoxyglucose being highly trapped in rapidly dividing cells makes (18)F-FDG-PET recommended in the staging, prognostic evaluation and follow-up of metastatic and/or of poorly differentiated thyroid carcinomas. (18)F-FDG PET/CT can help in the localization of persistent/recurrent disease...
February 2017: Annales D'endocrinologie
https://www.readbyqxmd.com/read/27863564/designing-and-developing-pet-based-precision-model-in-thyroid-carcinoma-the-potential-avenues-for-a-personalized-clinical-care
#5
REVIEW
Sandip Basu, Rahul Vithalrao Parghane
This communication enumerates the current uses and potential areas where PET could be clinically utilized for developing "precision medicine" type model in thyroid carcinoma. (1) In routine clinics, PET imaging (with fluorodeoxyglucose [FDG]) is utilized to investigate patients of differentiated thyroid carcinoma (DTC) with high thyroglobulin and negative iodine scintigraphy (TENIS) and in medullary carcinoma thyroid (MCT) when the tumor markers (eg, calcitonin and carcino embryonic antigen [CEA]) are raised postoperatively (PET with FDG, (68)Ga-DOTA-NOC/TATE, FDOPA)...
January 2017: PET Clinics
https://www.readbyqxmd.com/read/27390160/radionuclide-imaging-of-musculoskeletal-infection-a-review
#6
REVIEW
Christopher J Palestro
There are numerous imaging tests for diagnosing musculoskeletal infection. Radiographs are routinely performed, because even when not diagnostic, they provide an anatomic overview of the region of interest that could influence subsequent procedure selection and interpretation. MRI is sensitive and provides superb anatomic detail. Bone scintigraphy accurately diagnoses osteomyelitis in bones not affected by underlying conditions. (67)Ga is used primarily for spondylodiskitis. Although in vitro labeled leukocyte imaging is the radionuclide test of choice for complicating osteomyelitis such as diabetic pedal osteomyelitis and prosthetic joint infection, it is not useful for spondylodiskitis...
September 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/27199362/124i-pet-assessment-of-response-of-bone-metastases-to-initial-radioiodine-treatment-of-differentiated-thyroid-cancer
#7
Walter Jentzen, Femke Verschure, Annelie van Zon, Rudie van de Kolk, Roel Wierts, Jochen Schmitz, Andreas Bockisch, Ina Binse
Iodine-positive bone metastases (BMs) are often resistant after initial radioiodine therapy applying the standard-activity approach. A comprehensive lesion-based response study for BMs has not, to our knowledge, yet been performed. In this study, pretherapy and follow-up (124)I PET/CT data on BMs from differentiated thyroid cancer patients were retrospectively analyzed to assess the relationship between absorbed dose (AD) of radiation and response after initial radioiodine treatment. METHODS: Before and after initial radioiodine therapy, patients underwent serial PET/CT scanning after administration of 20-40 MBq of (124)I...
October 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/27158012/the-role-of-iodine-124-positron-emission-tomography-imaging-in-the-management-of-patients-with-thyroid-cancer
#8
REVIEW
Ravinder K Grewal, Mark Lubberink, Keith S Pentlow, Steven M Larson
Molecular imaging is the visualization, characterization, and measurement of biologic processes at the molecular and cellular levels in human beings and other living systems. In thyroid cancer, this includes imaging iodine transport, which is active in about 80% of well-differentiated thyroid malignancies. Iodine-124 imaging with positron emission tomography (I-124-PET) is ideal for this purpose because PET provides tomographic images with spatial and contrast resolution. Because iodine-131 is the mainstay for therapy in thyroid cancer, and because success or failure of therapy depends on the degree of iodine uptake by the tumor cells, I-124-PET imaging will increasingly act as a surrogate for this treatment...
July 2007: PET Clinics
https://www.readbyqxmd.com/read/27096954/optical-and-nuclear-imaging-of-glioblastoma-with-phosphatidylserine-targeted-nanovesicles
#9
Víctor M Blanco, Zhengtao Chu, Kathleen LaSance, Brian D Gray, Koon Yan Pak, Therese Rider, Kenneth D Greis, Xiaoyang Qi
Multimodal tumor imaging with targeted nanoparticles potentially offers both enhanced specificity and sensitivity, leading to more precise cancer diagnosis and monitoring. We describe the synthesis and characterization of phenol-substituted, lipophilic orange and far-red fluorescent dyes and a simple radioiodination procedure to generate a dual (optical and nuclear) imaging probe. MALDI-ToF analyses revealed high iodination efficiency of the lipophilic reporters, achieved by electrophilic aromatic substitution using the chloramide 1,3,4,6-tetrachloro-3α,6α-diphenyl glycoluril (Iodogen) as the oxidizing agent in an organic/aqueous co-solvent mixture...
May 31, 2016: Oncotarget
https://www.readbyqxmd.com/read/26897336/nuclear-medicine-imaging-of-bone-infections
#10
REVIEW
C Love, C J Palestro
Osteomyelitis is a broad group of infectious diseases that involve the bone and/or bone marrow. It can arise haematogenously, via extension from a contiguous infection, or by direct inoculation during surgery or trauma. The diagnosis is not always obvious and imaging tests are frequently performed as part of the diagnostic work-up. Commonly performed radionuclide tests include technetium-99m ((99m)Tc)-diphosphonate bone scintigraphy (bone), and gallium-67 ((67)Ga) and in vitro labelled leukocyte (white blood cell; WBC) imaging...
July 2016: Clinical Radiology
https://www.readbyqxmd.com/read/26806023/radiosynthesis-of-the-iodine-124-labeled-hsp90-inhibitor-pu-h71
#11
Tony Taldone, Danuta Zatorska, Stefan O Ochiana, Peter Smith-Jones, Jacek Koziorowski, Mark P Dunphy, Pat Zanzonico, Alexander Bolaender, Jason S Lewis, Steven M Larson, Gabriela Chiosis, Naga Vara Kishore Pillarsetty
Heat shock protein 90 (Hsp90) is an ATP dependent molecular chaperone protein whose function is critical for maintaining several key proteins involved in survival and proliferation of cancer cells. PU-H71 (1), is a potent purine-scaffold based ATP pocket binding Hsp90 inhibitor which has been shown to have potent activity in a broad range of in vivo cancer models and is currently in Phase I clinical trials in patients with advanced solid malignancies, lymphomas, and myeloproliferative neoplasms. In this report, we describe the radiosynthesis of [(124)I]-PU-H71(5); this was synthesized from the corresponding Boc-protected stannane precursor 3 by iododestannylation with [(124)I]-NaI using chloramine-T as an oxidant for 2 min, followed by Boc deprotection with 6 N HCl at 50 °C for 30 min to yield the final compound...
March 2016: Journal of Labelled Compounds & Radiopharmaceuticals
https://www.readbyqxmd.com/read/25739884/assessment-of-a-fully-3d-monte-carlo-reconstruction-method-for-preclinical-pet-with-iodine-124
#12
M Moreau, I Buvat, L Ammour, N Chouin, F Kraeber-Bodéré, M Chérel, T Carlier
Iodine-124 is a radionuclide well suited to the labeling of intact monoclonal antibodies. Yet, accurate quantification in preclinical imaging with I-124 is challenging due to the large positron range and a complex decay scheme including high-energy gammas. The aim of this work was to assess the quantitative performance of a fully 3D Monte Carlo (MC) reconstruction for preclinical I-124 PET. The high-resolution small animal PET Inveon (Siemens) was simulated using GATE 6.1. Three system matrices (SM) of different complexity were calculated in addition to a Siddon-based ray tracing approach for comparison purpose...
March 21, 2015: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/25679452/tumor-immunotargeting-using-innovative-radionuclides
#13
REVIEW
Françoise Kraeber-Bodéré, Caroline Rousseau, Caroline Bodet-Milin, Cédric Mathieu, François Guérard, Eric Frampas, Thomas Carlier, Nicolas Chouin, Ferid Haddad, Jean-François Chatal, Alain Faivre-Chauvet, Michel Chérel, Jacques Barbet
This paper reviews some aspects and recent developments in the use of antibodies to target radionuclides for tumor imaging and therapy. While radiolabeled antibodies have been considered for many years in this context, only a few have reached the level of routine clinical use. However, alternative radionuclides, with more appropriate physical properties, such as lutetium-177 or copper-67, as well as alpha-emitting radionuclides, including astatine-211, bismuth-213, actinium-225, and others are currently reviving hopes in cancer treatments, both in hematological diseases and solid tumors...
February 11, 2015: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/25475377/radionuclide-imaging-of-osteomyelitis
#14
REVIEW
Christopher J Palestro
Radionuclide procedures frequently are performed as part of the diagnostic workup of osteomyelitis. Bone scintigraphy accurately diagnoses osteomyelitis in bones not affected by underlying conditions. Degenerative joint disease, fracture, and orthopedic hardware decrease the specificity of the bone scan, making it less useful in these situations. Gallium-67 scintigraphy was often used as an adjunct to bone scintigraphy for diagnosing osteomyelitis. However, now it is used primarily for spinal infections when (18)F-FDG imaging cannot be performed...
January 2015: Seminars in Nuclear Medicine
https://www.readbyqxmd.com/read/25202987/a-recommendation-for-revised-dose-calibrator-measurement-procedures-for-89zr-and-124i
#15
Bradley J Beattie, Keith S Pentlow, Joseph O'Donoghue, John L Humm
Because of their chemical properties and multiday half lives, iodine-124 and zirconium-89 are being used in a growing number of PET imaging studies. Some aspects of their quantitation, however, still need attention. For (89)Zr the PET images should, in principle, be as quantitatively accurate as similarly reconstructed 18F measurements. We found, however, that images of a 20 cm well calibration phantom containing (89)Zr underestimated the activity by approximately 10% relative to a dose calibrator measurement (Capintec CRC-15R) using a published calibration setting number of 465...
2014: PloS One
https://www.readbyqxmd.com/read/25102446/dynamic-pet-and-spect-imaging-with-radioiodinated-amyloid-reactive-peptide-p5-in-mice-a-positive-role-for-peptide-dehalogenation
#16
Emily B Martin, Stephen J Kennel, Tina Richey, Craig Wooliver, Dustin Osborne, Angela Williams, Alan Stuckey, Jonathan S Wall
Dynamic molecular imaging provides bio-kinetic data that is used to characterize novel radiolabeled tracers for the detection of disease. Amyloidosis is a rare protein misfolding disease that can affect many organs. It is characterized by extracellular deposits composed principally of fibrillar proteins and hypersulfated proteoglycans. We have previously described a peptide, p5, which binds preferentially to amyloid deposits in a murine model of reactive (AA) amyloidosis. We have determined the whole body distribution of amyloid by molecular imaging techniques using radioiodinated p5...
October 2014: Peptides
https://www.readbyqxmd.com/read/24906384/recurrent-differentiated-thyroid-cancer-towards-personalized-treatment-based-on-evaluation-of-tumor-characteristics-with-pet-thyropet-study-study-protocol-of-a-multicenter-observational-cohort-study
#17
MULTICENTER STUDY
Jakob W Kist, Bart de Keizer, Marcel P M Stokkel, Otto S Hoekstra, Wouter V Vogel
BACKGROUND: After initial treatment of differentiated thyroid carcinoma (DTC) patients are followed with thyroglobulin (Tg) measurements to detect recurrences. In case of elevated levels of Tg and negative neck ultrasonography, patients are treated 'blindly' with Iodine-131 (131I). However, in up to 50% of patients, the post-therapy scan reveals no 131I-targeting of tumor lesions. Such patients derive no benefit from the blind therapy but are exposed to its toxicity. Alternatively, iodine-124 (124I) Positron Emission Tomography/Computed Tomography (PET/CT) has become available to visualize DTC lesions and without toxicity...
June 5, 2014: BMC Cancer
https://www.readbyqxmd.com/read/24895600/124-iodine-a-longer-life-positron-emitter-isotope-new-opportunities-in-molecular-imaging
#18
REVIEW
Giuseppe Lucio Cascini, Artor Niccoli Asabella, Antonio Notaristefano, Antonino Restuccia, Cristina Ferrari, Domenico Rubini, Corinna Altini, Giuseppe Rubini
(124)Iodine ((124)I) with its 4.2 d half-life is particularly attractive for in vivo detection and quantification of longer-term biological and physiological processes; the long half-life of (124)I is especially suited for prolonged time in vivo studies of high molecular weight compounds uptake. Numerous small molecules and larger compounds like proteins and antibodies have been successfully labeled with (124)I. Advances in radionuclide production allow the effective availability of sufficient quantities of (124)I on small biomedical cyclotrons for molecular imaging purposes...
2014: BioMed Research International
https://www.readbyqxmd.com/read/24777501/radretumab-radioimmunotherapy-in-patients-with-brain-metastasis-a-124i-l19sip-dosimetric-pet-study
#19
Gian Luca Poli, Claudia Bianchi, Giorgio Virotta, Anna Bettini, Renzo Moretti, Eveline Trachsel, Giuliano Elia, Leonardo Giovannoni, Dario Neri, Andrea Bruno
Radioimmunotherapy (RIT) with (131)I-labeled L19SIP (radretumab; a small immunoprotein format antibody directed against the ED-B domain of fibronectin; ∼ 80 kDa molecular weight) has been investigated in several clinical trials. Here, we describe the use of immuno-PET imaging with iodine-124 ((124)I)-labeled L19SIP to predict doses delivered to tumor lesions and healthy organs by a subsequent radretumab RIT in patients with brain metastases from solid cancer. Bone marrow doses were evaluated both during the diagnostic phase and posttherapy, measuring activities in blood (germanium detector) and whole body (lanthanum bromide detector)...
August 2013: Cancer Immunology Research
https://www.readbyqxmd.com/read/24747530/production-of-iodine-124-and-its-applications-in-nuclear-medicine
#20
REVIEW
Ana Maria S Braghirolli, William Waissmann, Juliana Batista da Silva, Gonçalo R dos Santos
Until recently, iodine-124 was not considered to be an attractive isotope for medical applications owing to its complex radioactive decay scheme, which includes several high-energy gamma rays. However, its unique chemical properties, and convenient half-life of 4.2 days indicated it would be only a matter of time for its frequent application to become a reality. The development of new medical imaging techniques, especially improvements in the technology of positron emission tomography (PET), such as the development of new detectors and signal processing electronics, has opened up new prospects for its application...
August 2014: Applied Radiation and Isotopes
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