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https://www.readbyqxmd.com/read/29133057/development-of-11-c-labeled-%C3%AF-sulfhydryl-fatty-acid-tracer-for-myocardial-imaging-with-pet
#1
Xiangxiang Wu, Peizhi Wang, Ruixin Liu, Huahui Zeng, Fangfang Chao, Hao Liu, Caiyun Xu, Haifeng Hou, Qiong Yao
[(11)C]-S-methyl-16-thiopalmitic acid (a) was developed with excellent heart-to-background uptake ratios and higher retention in heart. Myocardial uptake and metabolism of the tracer is markedly higher CPT I dependent. When compared to [(11)C]-S-methyl-14-thiomyristic acid (b), [(11)C]-S-methyl-12-thiododecanoic acid (c) and [(11)C]-palmitate, a showed an early high uptake and a significantly slower late clearance in heart and a prolonged myocardial elimination half-life (30 min). Analysis of heart tissue and urine samples showed that a was metabolized via beta-oxidation in myocardium...
October 23, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29125731/imaging-pd-l1-expression-with-immunopet
#2
Charles Truillet, Hsueh Ling J Oh, Siok Ping Yeo, Chia-Yin Lee, Loc T Huynh, Junnian Wei, Matthew F L Parker, Collin Blakely, Natalia Sevillano, Yung-Hua Wang, Yuqin S Shen, Victor Olivas, Khaled M Jami, Anna Moroz, Benoit Jego, Emilie Jaumain, Lawrence Fong, Charles S Craik, Albert J Chang, Trever G Bivona, Cheng-I Wang, Michael J Evans
High sensitivity imaging tools could provide a more holistic view of target antigen expression to improve the identification of patients who might benefit from cancer immunotherapy. We developed for immunoPET a novel recombinant human IgG1 (termed C4) that potently binds an extracellular epitope on human and mouse PD-L1 and radiolabeled the antibody with zirconium-89. Small animal PET/CT studies showed that (89)Zr-C4 detected antigen levels on a patient derived xenograft (PDX) established from a non-small-cell lung cancer (NSCLC) patient before an 8-month response to anti-PD-1 and anti-CTLA4 therapy...
November 15, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29097780/in-vivo-monitoring-for-regional-changes-of-metabotropic-glutamate-receptor-subtype-1-mglur1-in-pilocarpine-induced-epileptic-rat-brain-by-small-animal-pet
#3
Tomoteru Yamasaki, Masayuki Fujinaga, Wakana Mori, Yiding Zhang, Hidekatsu Wakizaka, Nobuki Nengaki, Lin Xie, Akiko Hatori, Ming-Rong Zhang
Metabotropic glutamate receptor subtype 1 (mGluR1) is a crucial pharmacological target for several central nervous system disorders. In this study, we aimed to monitor in vivo regional changes of mGluR1 related to neuroinflammation in the brains of rats after pilocarpine-induced status epilepticus (PISE) using longitudinal positron emission tomography (PET). PISE was induced in rats by administering lithium chloride, followed by repeated pilocarpine hydrochloride treatments. PET assessments were conducted using N-[4-[6-(isopropylamino)-pyrimidin-4-yl]-1,3-thiazol-2-yl]-N-methyl-4-[(11)C]methylbenzamide ([(11)C]ITDM), a selective radioligand for mGluR1, and N-benzyl-N-[(11)C]methyl-2-(7-methyl-8-oxo-2-phenyl-7,8-dihydro-9H-purin-9-yl)acetamide ([(11)C]DAC), a selective translocator protein PET ligand for neuroinflammation monitoring...
November 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29037039/synthesis-and-preclinical-evaluation-of-18-f-peg3-fpn-for-the-detection-of-metastatic-pigmented-melanoma
#4
Xiaodong Xu, Lujie Yuan, Lianglan Yin, Yaqun Jiang, Yongkang Gai, Qingyao Liu, Yichun Wang, Yongxue Zhang, Xiaoli Lan
Although (18)F-5-fluoro-N-(2-[diethylamino]ethyl)picolinamide ((18)F-5-FPN) is considered a promising radiopharmaceutical for PET imaging of melanoma, it accumulates at high concentrations in the liver. The aim in this research was to optimize the structure of (18)F-5-FPN with triethylene glycol to reduce liver uptake as well as improve pharmacokinetics, and to evaluate its performance in detection of melanoma liver and lung metastases. (18)F-PEG3-FPN was successfully prepared with a high radiolabeling yield (44...
November 6, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29031113/cross-sectional-and-longitudinal-small-animal-pet-shows-pre-and-post-synaptic-striatal-dopaminergic-deficits-in-an-animal-model-of-hiv
#5
Sanhita Sinharay, Dianne Lee, Swati Shah, Siva Muthusamy, Georgios Z Papadakis, Xiang Zhang, Dragan Maric, William C Reid, Dima A Hammoud
INTRODUCTION: In vivo imaging biomarkers of various HIV neuropathologies, including dopaminergic dysfunction, are still lacking. Towards developing dopaminergic biomarkers of brain involvement in HIV, we assessed the pre and postsynaptic components of the dopaminergic system in the HIV-1 transgenic rat (Tg), a well-characterized model of treated HIV+ patients, using small-animal PET imaging. METHODS: Fifteen to 18 month-old Tg and wild type (WT) rats were imaged with both [18F]-FP-CMT, a dopamine transporter (DAT) ligand (n=16), and [18F]-Fallypride, a D2/D3 dopamine receptor (D2/D3DR) ligand (n=16)...
August 31, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/29029420/generation-and-evaluation-of-antibody-agents-for-molecular-imaging-of-cd44v6-expressing-cancers
#6
Anna-Karin Haylock, Johan Nilvebrant, Anja Mortensen, Irina Velikyan, Marika Nestor, Ronny Falk
AIM: The aim of this study was to generate and characterize scFv antibodies directed to human CD44v6, as well as to radiolabel and evaluate top candidates in vitro and in vivo for their potential use in CD44v6-targeted molecular imaging in cancer patients. MATERIALS AND METHODS: Phage display selections were used to isolate CD44v6-specific scFvs. A chain shuffling strategy was employed for affinity maturation based on a set of CD44v6-specific first-generation clones...
September 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/28976912/pet-performance-evaluation-of-madpet4-a-small-animal-pet-insert-for-a-7-tesla-mri-scanner
#7
Negar Omidvari, Jorge Cabello, Geoffrey Topping, Florian Roland Schneider, Stephan Paul, Markus Schwaiger, Sibylle I Ziegler
MADPET4 is the first small animal PET insert with two layers of individually read out crystals in combination with silicon photomultiplier technology. It has a novel detector arrangement, in which all crystals face the center of field of view transaxially. In this work, the PET performance of MADPET4 was evaluated and compared to other preclinical PET scanners using the NEMA NU 4 measurements, followed by imaging a mouse-size hot-rod resolution phantom and two in vivo simultaneous PET/MRI scans in a 7-T MRI scanner...
October 4, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28922962/changes-in-18f-fluorodeoxyglucose-activities-in-a-shockwave-induced-traumatic-brain-injury-model-using-lithotripsy
#8
Afshin Andre Divani, Jenny-Ann Phan, Pascal Salazar, Karen S SantaCruz, Ornina Bachour, Javad Mahmoudi, Xiao-Hong Zhu, Martin Pomper
We present a longitudinal study of cerebral metabolism using [18F]fluorodeoxyglucose (FDG) positron emission tomography (PET) in a rat model of shockwave-induced traumatic brain injury (SW-TBI). Anesthetized rats received 5 or 10 shockwave pulses to the right anterior lateral or dorsal frontal regions using shockwave lithotripsy. Animals were scanned for FDG uptake at baseline, 3 hours post-injury, and 3 days post-injury, using a small animal PET/CT scanner. FDG uptake at all time points was quantified as the ratio of brain activity relative to peripheral activity in the left ventricle (LV) in the heart (Abrain/ALV) for the entire brain, each hemisphere, and four cortices (motor, cingulate, somatosensory, and restrosplenial)...
September 19, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28912147/performance-of-a-pet-insert-for-high-resolution-small-animal-pet-mr-imaging-at-7t
#9
Greg Stortz, Jonathan D Thiessen, Daryl Bishop, Muhammad S Khan, Piotr Kozlowski, Fabrice Retière, Graham Schellenberg, Ehsan Shams, Xuezhu Zhang, Christopher J Thompson, Andrew Goertzen, Vesna Sossi
We present the characterization of a compact magnetic resonance (MR) compatible positron emission tomography (PET) insert for simultaneous pre-clinical PET/MR imaging. While specifically designed with the strict size constraint to fit inside the 114 mm inner diameter of the BGA-12S gradient coil used in the Bruker 70/20 and 94/20 series of small animal MR imaging (MRI) systems, the insert can be easily installed in any appropriate MRI scanner or used as a stand-alone PET system. Methods: The insert is made from a ring of 16 detector-blocks each made from depth-of-interaction capable dual-layer-offset arrays of cerium-doped lutetium-yttrium oxyorthosilicate crystals read out by silicon photomultiplier (SiPM) arrays...
September 14, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28863330/-18-f-labeled-perfluorocarbon-droplets-for-positron-emission-tomography-imaging
#10
Nagina Amir, David Green, Jeff Kent, Yun Xiang, Ivan Gorelikov, Minseok Seo, Megan Blacker, Nancy Janzen, Shannon Czorny, John F Valliant, Naomi Matsuura
INTRODUCTION: Nanoscale perfluorocarbon (PFC) droplets have been used to create imaging agents and drug delivery vehicles. However, development and characterization of new formulations of PFC droplets are hindered because of the lack of simple methods for quantitative and sensitive assessment of whole body tissue distribution and pharmacokinetics of the droplets. To address this issue, a general-purpose method for radiolabeling the inner core of nanoscale perfluorocarbon droplets with a hydrophobic and lipophobic fluorine-18 compound was developed, so that positron emission tomography (PET) and quantitative biodistribution studies can be employed to evaluate PFC nanodroplets in vivo...
July 12, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28863122/a-novel-molecular-agent-for-glioma-angiogenesis-imaging
#11
Chuanwang Miao, Wei Zhao, Shuanghu Yuan, Jinming Yu, Shuqiang Zhao, Li Ma, Dexian Zhang, Xudong Hu
BACKGROUND: Gliomas are rich in blood vessels and are the most primary and malignant type of brain tumor affecting the central nervous system. A few fluorine-18 (F)-labeled imaging agents can be used for imaging of tumor angiogenesis. In the current study, F-labeled recombinant human endostatin (rh-endostatin) was developed and evaluated as a probe for PET imaging of tumor angiogenesis. MATERIALS AND METHODS: F-fluorobenzoyl-endostatin (F-FB-endostatin) was synthesized from radiolabeling of rh-endostatin with N-succinimidyl-4-F-fluorobenzoate produced by a facile module-assisted radiosynthesis procedure...
November 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28825794/nanofitin-as-a-new-molecular-imaging-agent-for-the-diagnosis-of-epidermal-growth-factor-receptor-over-expressing-tumors
#12
Marine Goux, Guillaume Becker, Harmony Gorré, Sylvestre Dammicco, Ariane Desselle, Dominique Egrise, Natacha Leroi, François Lallemand, Mohamed Ali Bahri, Gilles Doumont, Alain Plenevaux, Mathieu Cinier, André Luxen
Epidermal growth-factor receptor (EGFR) is involved in cell growth and proliferation and is over-expressed in malignant tissues. Although anti-EGFR-based immunotherapy became a standard of care for patients with EGFR-positive tumors, this strategy of addressing cancer tumors by targeting EGFR with monoclonal antibodies is less-developed for patient diagnostic and monitoring. Indeed, antibodies exhibit a slow blood clearance, which is detrimental for positron emission tomography (PET) imaging. New molecular probes are proposed to overcome such limitations for patient monitoring, making use of low-molecular-weight protein scaffolds as alternatives to antibodies, such as Nanofitins with better pharmacokinetic profiles...
September 20, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28813596/molecular-imaging-of-p-glycoprotein-in-chemoresistant-tumors-using-a-dual-modality-pet-fluorescence-probe
#13
Mengzhe Wang, Chengqiong Mao, Hui Wang, Xueying Ling, Zhanhong Wu, Zibo Li, Xin Ming
Overexpression of P-glycoprotein (Pgp) has been considered a primary cause for multidrug resistance in a variety of cancers for three decades. However, clinical translation of Pgp targeted therapeutics has been hindered by lack of patient preselection based on the Pgp presence in tumors. We aim to develop a molecularly targeted probe for imaging tumoral Pgp in vivo with positron emission tomography (PET) and fluorescence, and to provide a tool for preselecting the patients with tumoral Pgp expression. Thus, a Pgp monoclonal antibody 15D3 was chemically modified with IRDye800 (IR800) and DOTA chelator...
October 2, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28808288/in-vivo-evaluation-of-radiotracers-targeting-the-melanin-concentrating-hormone-receptor-1-11-c-snap-7941-and-18-f-fe-snap-reveal-specific-uptake-in-the-ventricular-system
#14
Markus Zeilinger, Monika Dumanic, Florian Pichler, Lubos Budinsky, Wolfgang Wadsak, Katharina Pallitsch, Helmut Spreitzer, Rupert Lanzenberger, Marcus Hacker, Markus Mitterhauser, Cécile Philippe
The MCHR1 is involved in the regulation of energy homeostasis and changes of the expression are linked to a variety of associated diseases, such as diabetes and adiposity. The study aimed at the in vitro and in vivo evaluation of [(11)C]SNAP-7941 and [(18)F]FE@SNAP as potential PET-tracers for the MCHR1. Competitive binding studies with non-radioactive derivatives and small-animal PET/CT and MRI brain studies were performed under baseline conditions and tracer displacement with the unlabelled MCHR1 antagonist (±)-SNAP-7941...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28742337/gallium-complexation-stability-and-bioconjugation-of-1-4-7-triazacyclononane-derived-chelators-with-azaheterocyclic-arms
#15
Alexander Schmidtke, Tilman Läppchen, Christian Weinmann, Lorenz Bier-Schorr, Manfred Keller, Yvonne Kiefer, Jason P Holland, Mark D Bartholomä
We have recently introduced a 1,4,7-triazacyclononane (TACN) based chelating system with additional five-membered azaheterocyclic substituents for complexation of radioactive Cu(2+) ions. In this work, we investigated the complexation properties of these novel chelators with Ga(3+). In labeling experiments, we could show that the penta- and hexadentate imidazole derivatives NODIA-Me 4 and NOTI-Me 1 can be labeled with (68)Ga in specific activities up to ∼30 MBq nmol(-1), while the corresponding thiazole derivative NOTThia 2 did not label satisfactorily under identical conditions...
August 7, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28706558/qiliqiangxin-enhances-cardiac-glucose-metabolism-and-improves-diastolic-function-in-spontaneously-hypertensive-rats
#16
Jingfeng Wang, Zhiming Li, Yanyan Wang, Jingjing Zhang, Weipeng Zhao, Mingqiang Fu, Xueting Han, Jingmin Zhou, Junbo Ge
Cardiac diastolic dysfunction has emerged as a growing type of heart failure. The present study aims to explore whether Qiliqiangxin (QL) can benefit cardiac diastolic function in spontaneously hypertensive rat (SHR) through enhancement of cardiac glucose metabolism. Fifteen 12-month-old male SHRs were randomly divided into QL-treated, olmesartan-treated, and saline-treated groups. Age-matched WKY rats served as normal controls. Echocardiography and histological analysis were performed. Myocardial glucose uptake was determined by (18)F-FDG using small-animal PET imaging...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28692851/a-simple-device-to-convert-a-small-animal-pet-scanner-into-a-multi-sample-tissue-and-injection-syringe-counter
#17
Michael V Green, Jurgen Seidel, Peter L Choyke, Elaine M Jagoda
INTRODUCTION: We describe a simple fixture that can be added to the imaging bed of a small-animal PET scanner that allows for automated counting of multiple organ or tissue samples from mouse-sized animals and counting of injection syringes prior to administration of the radiotracer. The combination of imaging and counting capabilities in the same machine offers advantages in certain experimental settings. METHODS: A polyethylene block of plastic, sculpted to mate with the animal imaging bed of a small-animal PET scanner, is machined to receive twelve 5-ml containers, each capable of holding an entire organ from a mouse-sized animal...
October 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28689313/-137-cs-transmission-imaging-and-segmented-attenuation-corrections-in-a-small-animal-pet-scanner
#18
Ying-Hwey Nai, Takayuki Ose, Miho Shidahara, Hiroshi Watabe
Attenuation correction (AC) is required for accurate quantitative evaluation of small animal PET data. Our objective was to compare three AC methods in the small animal Clairvivo-PET scanner. The three AC methods involve applying attenuation coefficient maps generated by simulating a cylindrical map (SAC), segmenting the emission data (ESAC), and segmenting the transmission data (TSAC), imaged using a (137)Cs single-photon source. Investigation was carried out using a 65 mm uniform cylinder and an NEMA NU4 2008 mouse phantom, filled with water or tungsten liquid, to mimic bone...
July 8, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28682792/performance-of-a-high-resolution-depth-encoding-pet-detector-using-barium-sulfate-reflector
#19
Zhonghua Kuang, Xiaohui Wang, Cheng Li, Xinhan Deng, Kai Feng, Zhanli Hu, Xin Fu, Ning Ren, Xianming Zhang, Yunfei Zheng, Dong Liang, Xin Liu, Hairong Zheng, Yongfeng Yang
Small animal positron emission tomography (PET) is a well-established imaging modality in preclinical biomedical research. The performance of current small animal PET scanners is mainly limited by the detector performance and depth-encoding detectors are required to simultaneously achieve high spatial resolution and high sensitivity. In this work, the performance of a high-resolution dual-ended readout lutetium-yttrium oxyorthosilicate (LYSO) array using barium sulfate powder (BaSO4) as the inter-crystal reflector was measured for the first time and compared to that of a LYSO array using the most commonly used enhanced specular reflector (ESR)...
July 6, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28653240/immunopet-imaging-of-%C3%AE-v%C3%AE-6-expression-using-an-engineered-anti-%C3%AE-v%C3%AE-6-cys-diabody-site-specifically-radiolabeled-with-cu-64-considerations-for-optimal-imaging-with-antibody-fragments
#20
Jason B White, Lina Y Hu, David L Boucher, Julie L Sutcliffe
PURPOSE: Increased expression of the αvβ6 integrin correlates with advanced tumor grade and poor clinical outcome, identifying αvβ6 as a prognostic indicator and an attractive target for molecular imaging. This work investigated the ability of a disulfide-stabilized [(64)Cu]NOTA-αvβ6 cys-diabody to image αvβ6 expression in vivo using a nu/nu mouse model bearing human melanoma xenografts and positron-emission tomography. PROCEDURES: Small-animal positron emission tomography (PET) imaging, quantitative ROI analysis, and ex vivo biodistribution were conducted to ascertain tumor uptake and organ distribution of the [(64)Cu]NOTA-αvβ6 cys-diabody...
June 26, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
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