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Chen XP, Hsu FC, Huang KY, Hsieh TS, Farn SS, Sheu RJ, Yu CS. Fluorine-18 labeling PEGylated 6-boronotryptophan for PET scanning of mice for assessing the pharmacokinetics for boron neutron capture therapy of brain tumors. Bioorg Med Chem Lett 2024; 105:129744. [PMID: 38614152 DOI: 10.1016/j.bmcl.2024.129744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 04/06/2024] [Accepted: 04/10/2024] [Indexed: 04/15/2024]
Abstract
Two tryptophan compound classes 5- and 6-borono PEGylated boronotryptophan derivatives have been prepared for assessing their aqueous solubility as formulation of injections for boron neutron capture therapy (BNCT). The PEGylation has improved their aqueous solubility thereby increasing their test concentration in 1 mM without suffering from toxicity. In-vitro uptake assay of PEGylated 5- and 6-boronotryptophan showed that the B-10 concentration can reach 15-50 ppm in U87 cell whereas the uptake in LN229 cell varies. Shorter PEG compound 6-boronotryptophanPEG200[18F] was obtained in 1.7 % radiochemical yield and the PET-derived radioradioactivity percentage in 18 % was taken up by U87 tumor at the limb of xenograft mouse. As high as tumor to normal uptake ratio in 170 (T/N) was obtained while an inferior radioactivity uptake of 3 % and T/N of 8 was observed in LN229 xenografted mouse.
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Affiliation(s)
- Xiang-Ping Chen
- Department of Biomedical Engineering and Environmental Sciences, National Tsinghua University, Hsinchu 30013, Taiwan; PET Center, Department of Nuclear Medicine, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Fu-Chun Hsu
- Department of Biomedical Engineering and Environmental Sciences, National Tsinghua University, Hsinchu 30013, Taiwan
| | - Kwei-Yuan Huang
- Department of Biomedical Engineering and Environmental Sciences, National Tsinghua University, Hsinchu 30013, Taiwan
| | - Teng-San Hsieh
- Department of Biomedical Engineering and Environmental Sciences, National Tsinghua University, Hsinchu 30013, Taiwan
| | - Shiou-Shiow Farn
- Department of Isotope Application Research, National Atomic Research Institute, Taoyuan 325207, Taiwan
| | - Rong-Jiun Sheu
- Institute of Nuclear Engineering and Science, National Tsinghua University, Hsinchu 30013, Taiwan
| | - Chung-Shan Yu
- Department of Biomedical Engineering and Environmental Sciences, National Tsinghua University, Hsinchu 30013, Taiwan; Institute of Nuclear Engineering and Science, National Tsinghua University, Hsinchu 30013, Taiwan.
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Chung YH, Ho YP, Farn SS, Tsai WC, Li ZX, Lin TY, Weng CC. In vivo SPECT imaging of Tc-99 m radiolabeled exosomes from human umbilical-cord derived mesenchymal stem cells in small animals. Biomed J 2024:100721. [PMID: 38636899 DOI: 10.1016/j.bj.2024.100721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 02/15/2024] [Accepted: 03/27/2024] [Indexed: 04/20/2024] Open
Abstract
Extracellular vesicles derived from human umbilical cord-derived mesenchymal stem cells (UCMSC-EVs) have been postulated to have therapeutic potential for various diseases. However, the biodistribution and pharmacokinetics of these vesicles are still unclear. For a better understanding of the in vivo properties of UCMSC-EVs, in the present study, these vesicles were first radiolabeled with Technetium-99 m (99mTc-UCMSC-EVs) and evaluated using in vivo single photon emission computed tomography (SPECT) imaging and biodistribution experiments. SPECT images demonstrated that the liver and spleen tissues mainly took up the 99mTc-UCMSC-EVs. The biodistribution study observed slight uptake in the thyroid and stomach, indicating that 99mTc-UCMSC-EVs was stable at 24 h in vivo. The pharmacokinetic analyses of the blood half-life demonstrated the quick distribution phase (0.85 ± 0.28 min) and elimination phase (25.22 ± 20.76 min) in mice. This study provides a convenient and efficient method for 99mTc-UCMSC-EVs preparation without disturbing their properties. In conclusion, the biodistribution, quick elimination, and suitable stability in vivo of 99mTc-UCMSC-EVs were quantified by the noninvasive imaging and pharmacokinetic analyses, which provides useful information for indication selection, dosage protocol design, and toxicity assessment in future applications.
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Affiliation(s)
- Yi-Hsiu Chung
- Department of Medical Research and Development, Research Division, Chang Gung Memorial Hospital at Linkou, Taoyuan, 333, Taiwan
| | - Yi-Pei Ho
- Department of Medical Imaging and Radiological Sciences, Chang Gung University, Taoyuan, 333, Taiwan; Healthy Aging Research Center, Chang GungUniversity, Taoyuan, 333, Taiwan
| | - Shiou-Shiow Farn
- Department of Isotope Application, National Atomic Research Institute, Taoyuan, 325, Taiwan
| | | | | | - Tzou-Yien Lin
- Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan; College of Medicine, Chang Gung University, Taoyuan, 333, Taiwan.
| | - Chi-Chang Weng
- Department of Medical Research and Development, Research Division, Chang Gung Memorial Hospital at Linkou, Taoyuan, 333, Taiwan; Department of Medical Imaging and Radiological Sciences, Chang Gung University, Taoyuan, 333, Taiwan; Healthy Aging Research Center, Chang GungUniversity, Taoyuan, 333, Taiwan.
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3
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Chiu CH, Ma KH, Huang EYK, Chang HW, Weng SJ, Yu TH, Farn SS, Kuo YY, Huang WS, Cheng CY, Tao PL, Yeh SHH. Dextromethorphan moderates reward deficiency associated with central serotonin transporter availability in 3,4-methylenedioxy-methamphetamine-treated animals. J Chin Med Assoc 2024:02118582-990000000-00372. [PMID: 38587377 DOI: 10.1097/jcma.0000000000001087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/09/2024] Open
Abstract
BACKGROUND The neurotoxicity of 3,4-methylenedioxy-methamphetamine (MDMA) to the serotonergic system is well-documented. Dextromethorphan (DM), an antitussive drug, decreased morphine- or methamphetamine (MA)-induced reward in rats and may prevent MDMA-induced serotonergic deficiency in primates, as indicated by increased serotonin transporter (SERT) availability. We aimed to investigate the effects of DM on reward, behavioral sensitization, and neurotoxicity associated with loss of SERT induced by chronic MDMA administration in rats. METHODS Conditioned place preference (CPP) and locomotor activity tests were used to evaluate drug-induced reward and behavioral sensitization; 4-[18F]-ADAM/animal-PET and immunohistochemistry were used to explore the effects of DM on MDMA-induced loss of SERT. RESULTS MDMA significantly reduced SERT binding in the rat brain; however, co-administration of DM significantly restored SERT, enhancing the recovery rate at day 14 by an average of ~23% compared to the MDMA group. In confirmation of the PET findings, immunochemistry revealed MDMA reduced SERT immunoactivity in all brain regions, whereas DM markedly increased the serotonergic fiber density after MDMA induction. CONCLUSION Behavioral tests and in vivo longitudinal PET imaging demonstrated the CPP indexes and locomotor activities of the reward system correlate negatively with PET 4-[18F]ADAM SERT activity in the reward system. Our findings suggest MDMA induces functional abnormalities in a network of brain regions important to decision-making processes and the motivation circuit. DM may exert neuroprotective effects to reverse MDMA-induced neurotoxicity.
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Affiliation(s)
- Chuang-Hsin Chiu
- Department of Nuclear Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
| | - Kuo-Hsing Ma
- Department of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan, ROC
| | | | - Hsien-Wen Chang
- School of Pharmacy, National Defense Medical Center, Taipei, Taiwan, ROC
| | - Shao-Ju Weng
- Department of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan, ROC
| | - Tsung-Hsun Yu
- Brain Research Center, School of Medicine, National Defense Medical Center, Taipei, Taiwan, ROC
| | - Shiou-Shiow Farn
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, Taiwan, ROC
| | - Yu-Yeh Kuo
- Department of Nursing, Hsin-Sheng College of Medical Care and Management, Taoyuan, Taiwan, ROC
| | - Wen-Sheng Huang
- Department of Nuclear Medicine, Cheng-Hsin General Hospital, Taipei, Taiwan, ROC
| | - Cheng-Yi Cheng
- Department of Nuclear Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
| | - Pao-Luh Tao
- Center for Neuropsychiatric Research, National Health Research Institutes, Miaoli, Taiwan, ROC
| | - Skye Hsin-Hsien Yeh
- Brain Research Center, School of Medicine, National Defense Medical Center, Taipei, Taiwan, ROC
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Sun YC, Shi WX, Kuo WC, Hsiang YR, Lo WL, Chen LC, Farn SS, Lin YF, Chen KT. Cyanopyridoimidazole/1,2-Aminothiol Click Reaction: A Novel Bioorthogonal Reaction for Synthesis of Radiotracers. Bioconjug Chem 2024; 35:107-114. [PMID: 38108270 DOI: 10.1021/acs.bioconjchem.3c00496] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
We herein described the design and synthesis of the cyanopyridoimidazoles (CPIs) as new bioorthogonal click reagents toward 1,2-aminothiol groups. Kinetic and density functional theory-based studies of the synthetic compounds revealed that incorporating an electron-withdrawing substituent into the CPI scaffold lowers its lowest unoccupied molecular orbital energy, consequently increasing reactivity. Optimized CPI 8a showed rapid reactivity and high stability in physiological conditions and has been demonstrated to be suitable for various radiotracer synthetic methods. Based on the new bioorthogonal reaction, a [67Ga]Ga-labeled prostate-specific membrane antigen-targeted probe was successfully prepared for in vivo imaging of prostate cancer in an animal model.
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Affiliation(s)
- Yi-Chen Sun
- Department of Chemistry, National Dong Hwa University, Hualien 974301, Taiwan
| | - Wei-Xin Shi
- Department of Chemistry, National Dong Hwa University, Hualien 974301, Taiwan
| | - Wei-Chieh Kuo
- Department of Chemistry, National Dong Hwa University, Hualien 974301, Taiwan
| | - Yi-Rong Hsiang
- Department of Chemistry, National Dong Hwa University, Hualien 974301, Taiwan
| | - Wei-Lin Lo
- National Atomic Research Institute, Taoyuan 325207, Taiwan
| | | | | | - Ya-Fan Lin
- Department of Chemistry, National Dong Hwa University, Hualien 974301, Taiwan
| | - Kuo-Ting Chen
- Department of Chemistry, National Dong Hwa University, Hualien 974301, Taiwan
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Tsai SC, Farn SS, Lo WL, Ou Yang FY, Kang YC, Chen LC, Chen KT, Liao JW, Kung JY, Chen JT, Huang FYJ. Evaluation of Chelator-to-Antibody Ratio on Development of 89Zr-iPET Tracer for Imaging of PD-L1 Expression on Tumor. Int J Mol Sci 2023; 24:17132. [PMID: 38138961 PMCID: PMC10743313 DOI: 10.3390/ijms242417132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 11/23/2023] [Accepted: 11/29/2023] [Indexed: 12/24/2023] Open
Abstract
89Zr-iPET has been widely used for preclinical and clinical immunotherapy studies to predict patient stratification or evaluate therapeutic efficacy. In this study, we prepared and evaluated 89Zr-DFO-anti-PD-L1-mAb tracers with varying chelator-to-antibody ratios (CARs), including 89Zr-DFO-anti-PD-L1-mAb_3X (tracer_3X), 89Zr-DFO-anti-PD-L1-mAb_10X (tracer_10X), and 89Zr-DFO-anti-PD-L1-mAb_20X (tracer_20X). The DFO-anti-PD-L1-mAb conjugates with varying CARs were prepared using a random conjugation method and then subjected to quality control. The conjugates were radiolabeled with 89Zr and evaluated in a PD-L1-expressing CT26 tumor-bearing mouse model. Next, iPET imaging, biodistribution, pharmacokinetics, and ex vivo pathological and immunohistochemical examinations were conducted. LC-MS analysis revealed that DFO-anti-PD-L1-mAb conjugates were prepared with CARs ranging from 0.4 to 2.0. Radiochemical purity for all tracer groups was >99% after purification. The specific activity levels of tracer_3X, tracer_10X, and tracer_20X were 2.2 ± 0.6, 8.2 ± 0.6, and 10.5 ± 1.6 μCi/μg, respectively. 89Zr-iPET imaging showed evident tumor uptake in all tracer groups and reached the maximum uptake value at 24 h postinjection (p.i.). Biodistribution data at 168 h p.i. revealed that the tumor-to-liver, tumor-to-muscle, and tumor-to-blood uptake ratios for tracer_3X, tracer_10X, and tracer_20X were 0.46 ± 0.14, 0.58 ± 0.33, and 1.54 ± 0.51; 4.7 ± 1.3, 7.1 ± 3.9, and 14.7 ± 1.1; and 13.1 ± 5.8, 19.4 ± 13.8, and 41.3 ± 10.6, respectively. Significant differences were observed between tracer_3X and tracer_20X in the aforementioned uptake ratios at 168 h p.i. The mean residence time and elimination half-life for tracer_3X, tracer_10X, and tracer_20X were 25.4 ± 4.9, 24.2 ± 6.1, and 25.8 ± 3.3 h and 11.8 ± 0.5, 11.1 ± 0.7, and 11.7 ± 0.6 h, respectively. No statistical differences were found between-tracer in the aforementioned pharmacokinetic parameters. In conclusion, 89Zr-DFO-anti-PD-L1-mAb tracers with a CAR of 1.4-2.0 may be better at imaging PD-L1 expression in tumors than are traditional low-CAR 89Zr-iPET tracers.
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Affiliation(s)
- Shih-Chuan Tsai
- Department of Nuclear Medicine, Taichung Veterans General Hospital, Taichung 407219, Taiwan; (S.-C.T.); (J.-Y.K.)
| | - Shiou-Shiow Farn
- National Atomic Research Institute, Taoyuan 325207, Taiwan; (S.-S.F.); (W.-L.L.); (F.-Y.O.Y.); (L.-C.C.); (J.-T.C.)
| | - Wei-Lin Lo
- National Atomic Research Institute, Taoyuan 325207, Taiwan; (S.-S.F.); (W.-L.L.); (F.-Y.O.Y.); (L.-C.C.); (J.-T.C.)
| | - Fang-Yu Ou Yang
- National Atomic Research Institute, Taoyuan 325207, Taiwan; (S.-S.F.); (W.-L.L.); (F.-Y.O.Y.); (L.-C.C.); (J.-T.C.)
| | - Yong-Ching Kang
- Department of Medical Imaging and Radiological Sciences, Central Taiwan University of Science and Technology, Taichung 406053, Taiwan;
| | - Liang-Cheng Chen
- National Atomic Research Institute, Taoyuan 325207, Taiwan; (S.-S.F.); (W.-L.L.); (F.-Y.O.Y.); (L.-C.C.); (J.-T.C.)
| | - Kuo-Ting Chen
- Department of Chemistry, National Dong Hwa University, Hualien 974301, Taiwan;
| | - Jiunn-Wang Liao
- Graduate Institute of Veterinary Pathobiology, National Chung-Hsing University, Taichung 402202, Taiwan;
| | - Jui-Yin Kung
- Department of Nuclear Medicine, Taichung Veterans General Hospital, Taichung 407219, Taiwan; (S.-C.T.); (J.-Y.K.)
| | - Jenn-Tzong Chen
- National Atomic Research Institute, Taoyuan 325207, Taiwan; (S.-S.F.); (W.-L.L.); (F.-Y.O.Y.); (L.-C.C.); (J.-T.C.)
| | - Feng-Yun J. Huang
- Department of Medical Imaging and Radiological Sciences, Central Taiwan University of Science and Technology, Taichung 406053, Taiwan;
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Chen WH, Chiu CH, Farn SS, Cheng KH, Huang YR, Lee SY, Fang YC, Lin YH, Chang KW. Identification of the Hepatic Metabolites of Flumazenil and their Kinetic Application in Neuroimaging. Pharmaceuticals (Basel) 2023; 16:ph16050764. [PMID: 37242547 DOI: 10.3390/ph16050764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 05/08/2023] [Accepted: 05/11/2023] [Indexed: 05/28/2023] Open
Abstract
Studies of the neurobiological causes of anxiety disorders have suggested that the γ-aminobutyric acid (GABA) system increases synaptic concentrations and enhances the affinity of GABAA (type A) receptors for benzodiazepine ligands. Flumazenil antagonizes the benzodiazepine-binding site of the GABA/benzodiazepine receptor (BZR) complex in the central nervous system (CNS). The investigation of flumazenil metabolites using liquid chromatography (LC)-tandem mass spectrometry will provide a complete understanding of the in vivo metabolism of flumazenil and accelerate radiopharmaceutical inspection and registration. The main goal of this study was to investigate the use of reversed-phase high performance liquid chromatography (PR-HPLC), coupled with electrospray ionization triple-quadrupole tandem mass spectrometry (ESI-QqQ MS), to identify flumazenil and its metabolites in the hepatic matrix. Carrier-free nucleophilic fluorination with an automatic synthesizer for [18F]flumazenil, combined with nano-positron emission tomography (NanoPET)/computed tomography (CT) imaging, was used to predict the biodistribution in normal rats. The study showed that 50% of the flumazenil was biotransformed by the rat liver homogenate in 60 min, whereas one metabolite (M1) was a methyl transesterification product of flumazenil. In the rat liver microsomal system, two metabolites were identified (M2 and M3), as their carboxylic acid and hydroxylated ethyl ester forms between 10 and 120 min, respectively. A total of 10-30 min post-injection of [18F]flumazenil showed an immediate decreased in the distribution ratio observed in the plasma. Nevertheless, a higher ratio of the complete [18F]flumazenil compound could be used for subsequent animal studies. [18F] According to in vivo nanoPET/CT imaging and ex vivo biodistribution assays, flumazenil also showed significant effects on GABAA receptor availability in the amygdala, prefrontal cortex, cortex, and hippocampus in the rat brain, indicating the formation of metabolites. We reported the completion of the biotransformation of flumazenil by the hepatic system, as well as [18F]flumazenil's potential as an ideal ligand and PET agent for the determination of the GABAA/BZR complex for multiplex neurological syndromes at the clinical stage.
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Affiliation(s)
- Wei-Hsi Chen
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan City 325207, Taiwan
| | - Chuang-Hsin Chiu
- Department of Nuclear Medicine, Tri-Service General Hospital, Taipei 114202, Taiwan
| | - Shiou-Shiow Farn
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan City 325207, Taiwan
| | - Kai-Hung Cheng
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan City 325207, Taiwan
| | - Yuan-Ruei Huang
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan City 325207, Taiwan
| | - Shih-Ying Lee
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan City 325207, Taiwan
| | - Yao-Ching Fang
- Taipei Neuroscience Institute, Taipei Medical University, Taipei 110301, Taiwan
| | - Yu-Hua Lin
- Laboratory Animal Center, Taipei Medical University, Taipei 110301, Taiwan
| | - Kang-Wei Chang
- Taipei Neuroscience Institute, Taipei Medical University, Taipei 110301, Taiwan
- Laboratory Animal Center, Taipei Medical University, Taipei 110301, Taiwan
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Farn SS, Chang KW, Lin WC, Yu HM, Lin KL, Tseng YC, Chang Y, Yu CS, Lin WJ. Synthesis, Radiolabeling, and Preliminary in vivo Evaluation of [ 68Ga] IPCAT-NOTA as an Imaging Agent for Dopamine Transporter. Drug Des Devel Ther 2021; 15:2577-2591. [PMID: 34168430 PMCID: PMC8216701 DOI: 10.2147/dddt.s288600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Accepted: 05/11/2021] [Indexed: 11/25/2022]
Abstract
Introduction Novel radiotracer development for imaging dopamine transporters is a subject of interest because although [99mTc]TRODAT-1, [123I]β-CIT, and [123I]FP-CIT are commercially available; 99Mo/99mTc generator is in short supply and 123I production is highly dependent on compact cyclotron. Therefore, we designed a novel positron emission tomography (PET) tracer based on a tropane derivative through C-2 modification to conjugate NOTA for chelating 68Ga, a radioisotope derived from a 68Ge/68Ga generator. Methods IPCAT-NOTA 22 was synthesized and labeled with [68Ga]GaCl4− at room temperature. Biological studies on serum stability, LogP, and in vitro autoradiography (binding assay and competitive assay) were performed. Furthermore, ex vivo autoradiography, biodistribution, and dynamic PET imaging studies were performed in Sprague Dawley rats. Results [68Ga]IPCAT-NOTA 24 obtained had a radiochemical yield of ≥90% and a specific activity of 4.25 MBq/nmol. [68Ga]IPCAT-NOTA 24 of 85% radiochemical purity (RCP%) was stable at 37°C for up to 60 minutes in serum with a lipophilicity of 0.88. The specific binding ratio (SBR%) reached 15.8 ± 6.7 at 60 minutes, and the 85% specific uptake could be blocked through co-injection at 100- and 1000-fold of the cold precursor in in vitro binding studies. Tissue regional distribution studies in rats with [68Ga]IPCAT-NOTA 24 showed striatal uptake (0.02% at 5 minutes and 0.007% at 60 minutes) with SBR% of 6%, 25%, and 62% at 5–15, 30–40, and 60–70 minutes, respectively, in NanoPET studies. The RCP% of [68Ga]IPCAT-NOTA 24 at 30 minutes in vivo remained 67.65%. Conclusion Data described here provide new information on the design of PET probe of conjugate/pendent approach for DAT imaging. Another chelator or another direct method of intracranial injection must be used to prove the relation between [68Ga]IPCAT-NOTA 24 uptake and transporter localization.
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Affiliation(s)
- Shiou-Shiow Farn
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, 32546, Taiwan.,Department of Biomedical Engineering and Environmental Sciences, National Tsing-Hua University, Hsinchu, 300, Taiwan
| | - Kang-Wei Chang
- Laboratory Animal Center, Office of Research and Development, Taipei Medical University, Taipei, 11031, Taiwan
| | - Wan-Chi Lin
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, 32546, Taiwan
| | - Hung-Man Yu
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, 32546, Taiwan
| | - Kun-Liang Lin
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, 32546, Taiwan
| | - Yu-Chin Tseng
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, 32546, Taiwan
| | - Yu Chang
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, 32546, Taiwan
| | - Chung-Shan Yu
- Department of Biomedical Engineering and Environmental Sciences, National Tsing-Hua University, Hsinchu, 300, Taiwan.,Institute of Nuclear Engineering and Science, College of Nuclear Science, National Tsing-Hua University, Hsinchu, 300, Taiwan
| | - Wuu-Jyh Lin
- Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, 32546, Taiwan
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Huang YC, Farn SS, Chou YC, Yeh CN, Chang CW, Chung YH, Chen TW, Huang WS, Yu CS. Synthesis of para
-[ 18
F]Fluorofenbufen Octylamide for PET Imaging of Brain Tumors. J CHIN CHEM SOC-TAIP 2018. [DOI: 10.1002/jccs.201700300] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ying-Cheng Huang
- Department of Neurosurgery, Chang-Gung Memorial Hospital at Linkou; Chang Gung University; Taiwan
| | - Shiou-Shiow Farn
- Department of Biomedical Engineering and Environmental Sciences; National Tsinghua University; Hsinchu 300 Taiwan
- Isotope Application Division; Institute of Nuclear Energy Research; Taoyuan 32546 Taiwan
| | - Yo-Cheng Chou
- Department of Biomedical Engineering and Environmental Sciences; National Tsinghua University; Hsinchu 300 Taiwan
| | - Chun-Nan Yeh
- Department of Surgery, Chang-Gung Memorial Hospital at Linkou; Chang Gung University; Taiwan
| | - Chi-Wei Chang
- Department of Nuclear Medicine; Veterans General Hospital at Taipei; Taiwan
| | - Yi-Hsiu Chung
- Center for Advanced Molecular Imaging and Translation; Chang Gung Memorial Hospital; Taiwan
| | - Tsong-Wen Chen
- Department of Surgery, Chang-Gung Memorial Hospital at Linkou; Chang Gung University; Taiwan
| | - Wen-Sheng Huang
- Department of Nuclear Medicine; Veterans General Hospital at Taipei; Taiwan
| | - Chung-Shan Yu
- Department of Biomedical Engineering and Environmental Sciences; National Tsinghua University; Hsinchu 300 Taiwan
- Institute of Nuclear Engineering and Science; National Tsing-Hua University; Hsinchu 300 Taiwan
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Chang CW, Yeh CN, Chung YH, Chen YR, Tien SW, Chen TW, Farn SS, Huang YC, Yu CS. Synthesis and evaluation of ortho-[ 18F] fluorocelecoxib for COX-2 cholangiocarcinoma imaging. Drug Des Devel Ther 2018; 12:1467-1478. [PMID: 29872269 PMCID: PMC5973465 DOI: 10.2147/dddt.s161718] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Background An 18F-tagged NSAID analog was prepared for use as a probe for COX-2 expression, which is associated with tumor development. Methods The in vivo uptake of celecoxib was monitored with ortho-[18F]fluorocelecoxib using positron emission tomography (PET). The binding affinity of ortho-[18F]fluorocelecoxib to COX-1 and COX-2 enzymes were assessed using the competitor celecoxib. Results The IC50 values were 0.039 μM and 0.024 μM, respectively. A selectivity index of 1.63 was obtained (COX-2 vs COX-1). COX-2 overexpressed cholangiocarcinoma (CCA) murine cells took up more ortho-[18F]fluorocelecoxib than that by usual CCA cells from 10 to 60 minutes post incubation. Competitive inhibition (blocking) of the tracer uptake of ortho-[18F]fluorocelecoxib in the presence of celecoxib by the COX-2 overexpressed CCA cells and the usual CCA cells gave the IC50 values of 0.5 μM and 46.5 μM, respectively. Based on the in vitro accumulation data and in vivo metabolism half-life (30 min), PET scanning was performed 30–60 min after the administration of ortho-[18F]fluorocelecoxib through the tail vein. Study of ortho-[18F]F-celecoxib in the CCA rats showed a tumor to normal ratio (T/N) of 1.38±0.23 and uptake dose of 1.14±0.25 (%ID/g). Conclusion The inferior in vivo blocking results of 1.48±0.20 (T/N) and 1.18±0.22 (%ID/g) suggests that the nonspecificity is associated with the complex role of peroxidase or the binding to carbonic anhydrase.
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Affiliation(s)
- Chi-Wei Chang
- Department of Nuclear Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Chun-Nan Yeh
- Department of Surgery, Liver Research Center, Chang-Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, Taiwan
| | - Yi-Hsiu Chung
- Center for Advanced Molecular Imaging and Translation, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Yong-Ren Chen
- Department of Biomedical Engineering and Environmental Sciences, National Tsinghua University, Hsinchu, Taiwan
| | - Shi-Wei Tien
- Department of Biomedical Engineering and Environmental Sciences, National Tsinghua University, Hsinchu, Taiwan
| | - Tsung-Wen Chen
- Department of Surgery, Liver Research Center, Chang-Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, Taiwan
| | - Shiou-Shiow Farn
- Department of Biomedical Engineering and Environmental Sciences, National Tsinghua University, Hsinchu, Taiwan.,Isotope Application Division, Institute of Nuclear Energy Research, Taoyuan, Taiwan
| | - Ying-Cheng Huang
- Department of Neurosurgery, Chang-Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, Taiwan
| | - Chung-Shan Yu
- Department of Biomedical Engineering and Environmental Sciences, National Tsinghua University, Hsinchu, Taiwan.,Institute of Nuclear Engineering and Science, National Tsinghua University, Hsinchu, Taiwan
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Farn SS, Yeh YH, Li CC, Yang CS, Chen JT, Yu CS, Lin WJ. Development and validation of a reversed-phase HPLC method for analysis of radiochemical purity in [ 123 I]IBZM. Appl Radiat Isot 2017; 127:61-67. [DOI: 10.1016/j.apradiso.2017.04.022] [Citation(s) in RCA: 2] [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] [Received: 10/27/2016] [Accepted: 04/14/2017] [Indexed: 11/25/2022]
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11
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Li CC, Farn SS, Yeh YH, Lin WJ, Shen LH. Development and validation of an anion-exchange HPLC method for the determination of fluoride content and radiochemical purity in [18F]NaF. Nucl Med Biol 2011; 38:605-12. [DOI: 10.1016/j.nucmedbio.2010.10.008] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2010] [Revised: 10/06/2010] [Accepted: 10/26/2010] [Indexed: 10/18/2022]
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12
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Abstract
BACKGROUND Graham et al. [Lancet, I (1987) 1174] found a late increase of 13C enrichment in the 13C-urea breath test 120 min after administration of labeled urea to patients without Helicobacter pylori infection. This may give false positive results. AIM We designed this study to elucidate the contribution of the gastrointestinal tract below the stomach to the 13C-urea breath test. PATIENTS Twenty-eight patients with dyspeptic symptoms who gave their consent were enrolled. METHODS Patients underwent the 13C-urea breath tests both via the mouth (as usual) and the duodenum (labeled urea introduced to the second portion). Breath samples were collected at baseline, 5, 15, 30, 45, 60, 90, 120, 150 and 180 min for analysis. H. pylori status was defined by the CLOtest and by histological examination. RESULTS There was no late increase in 13C enrichment of 13C-urea breath test for eight H. pylori negative patients either via the mouth or the duodenum. For those H. pylori positive patients, seventeen had no late rise 13C enrichment of the 13C-urea breath test via the duodenum and three patients had a rise after 15 min. CONCLUSIONS No late rise in 13CO2 excretion to cause a positive 13C-urea breath test up to 180 min after the administration of labeled urea was found in the present study.
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Affiliation(s)
- T H Lee
- Department of Internal Medicine, Far Eastern Memorial Hospital, 21, Nan-Ya S. Road, Sec. 2, Pan-Chiao City, Taipei County, 220 Taiwan.
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Abstract
BACKGROUND Mouth washing is often mentioned as a possible method to eliminate the interference of urease activity in the oral cavity before the [13C]-urea breath test (UBT). However, the effectiveness of mouth washing prior to testing has not been demonstrated clearly in the literature. Thus, the present study was designed to examine the consistency of the [13C]-UBT and the effects of mouth washing on it. METHODS A total of 101 healthy volunteers underwent the [13C]-UBT three times. The first and second tests used a standard protocol and collected samples at 5, 10, 15 and 30 min. In the third test, the procedure was the same except that mouth washing was omitted. RESULTS We used 5 permil (/1000) as the cut-off value and there were 21 (20.8%) positive cases. The kappa values for the samples collected at 5, 10, 15 and 30 min between the first and second tests were 0.68, 0.97, 1 and 1, respectively, and all showed good consistency, except for the sample collected at 5 min. Judging from the mean value of the [13C] enrichment of the first and second tests (with mouth washing) and the third test (without mouth washing), 50 (63.3%), 15 (18.8%), 0 and 0 cases at 5, 10, 15 and 30 min, respectively, changed from negative to positive. There were 14 (17.5%) and six (7.5%) cases at 15 and 30 min, respectively, whose [13C] enrichment changed from less than 3 (negative) to between 3 and 5 (border zone). CONCLUSIONS These results indicate that mouth washing had an important effect on samples obtained at 5 and 10 min, while this influence decreased at 15 min and was lowest at 30 min.
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Affiliation(s)
- T H Lee
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, ROC.
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