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Zammit M, Kao CM, Zhang HJ, Tsai HM, Holderman N, Mitchell S, Tanios E, Bhuiyan M, Freifelder R, Kucharski A, Green WN, Mukherjee J, Chen CT. Evaluation of an Image-Derived Input Function for Kinetic Modeling of Nicotinic Acetylcholine Receptor-Binding PET Ligands in Mice. Int J Mol Sci 2023; 24:15510. [PMID: 37958495 PMCID: PMC10650787 DOI: 10.3390/ijms242115510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 10/18/2023] [Accepted: 10/21/2023] [Indexed: 11/15/2023] Open
Abstract
Positron emission tomography (PET) radioligands that bind with high-affinity to α4β2-type nicotinic receptors (α4β2Rs) allow for in vivo investigations of the mechanisms underlying nicotine addiction and smoking cessation. Here, we investigate the use of an image-derived arterial input function and the cerebellum for kinetic analysis of radioligand binding in mice. Two radioligands were explored: 2-[18F]FA85380 (2-FA), displaying similar pKa and binding affinity to the smoking cessation drug varenicline (Chantix), and [18F]Nifene, displaying similar pKa and binding affinity to nicotine. Time-activity curves of the left ventricle of the heart displayed similar distribution across wild type mice, mice lacking the β2-subunit for ligand binding, and acute nicotine-treated mice, whereas reference tissue binding displayed high variation between groups. Binding potential estimated from a two-tissue compartment model fit of the data with the image-derived input function were higher than estimates from reference tissue-based estimations. Rate constants of radioligand dissociation were very slow for 2-FA and very fast for Nifene. We conclude that using an image-derived input function for kinetic modeling of nicotinic PET ligands provides suitable results compared to reference tissue-based methods and that the chemical properties of 2-FA and Nifene are suitable to study receptor response to nicotine addiction and smoking cessation therapies.
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Affiliation(s)
- Matthew Zammit
- Department of Radiology, University of Chicago, Chicago, IL 60637, USA
| | - Chien-Min Kao
- Department of Radiology, University of Chicago, Chicago, IL 60637, USA
| | - Hannah J. Zhang
- Department of Radiology, University of Chicago, Chicago, IL 60637, USA
| | - Hsiu-Ming Tsai
- Department of Radiology, University of Chicago, Chicago, IL 60637, USA
| | | | - Samuel Mitchell
- Department of Radiology, University of Chicago, Chicago, IL 60637, USA
| | - Eve Tanios
- Department of Radiology, University of Chicago, Chicago, IL 60637, USA
| | - Mohammed Bhuiyan
- Department of Radiology, University of Chicago, Chicago, IL 60637, USA
| | | | - Anna Kucharski
- Department of Radiology, University of Chicago, Chicago, IL 60637, USA
- Fermi National Accelerator Laboratory, Batavia, IL 60510, USA
| | - William N. Green
- Department of Neurobiology, University of Chicago, Chicago, IL 60637, USA
- Marine Biological Laboratory, Woods Hole, MA 02543, USA
| | - Jogeshwar Mukherjee
- Department of Radiological Sciences, University of California, Irvine, CA 92697, USA
| | - Chin-Tu Chen
- Department of Radiology, University of Chicago, Chicago, IL 60637, USA
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[ 18F]Nifene PET/CT Imaging in Mice: Improved Methods and Preliminary Studies of α4β2* Nicotinic Acetylcholinergic Receptors in Transgenic A53T Mouse Model of α-Synucleinopathy and Post-Mortem Human Parkinson's Disease. Molecules 2021; 26:molecules26237360. [PMID: 34885943 PMCID: PMC8659100 DOI: 10.3390/molecules26237360] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/23/2021] [Accepted: 12/01/2021] [Indexed: 11/17/2022] Open
Abstract
We report [18F]nifene binding to α4β2* nicotinic acetylcholinergic receptors (nAChRs) in Parkinson’s disease (PD). The study used transgenic Hualpha-Syn(A53T) PD mouse model of α-synucleinopathy for PET/CT studies in vivo and autoradiography in vitro. Additionally, postmortem human PD brain sections comprising of anterior cingulate were used in vitro to assess translation to human studies. Because the small size of mice brain poses challenges for PET imaging, improved methods for radiosynthesis of [18F]nifene and simplified PET/CT procedures in mice were developed by comparing intravenous (IV) and intraperitoneal (IP) administered [18F]nifene. An optimal PET/CT imaging time of 30–60 min post injection of [18F]nifene was established to provide thalamus to cerebellum ratio of 2.5 (with IV) and 2 (with IP). Transgenic Hualpha-Syn(A53T) mice brain slices exhibited 20–35% decrease while in vivo a 20–30% decrease of [18F]nifene was observed. Lewy bodies and α-synuclein aggregates were confirmed in human PD brain sections which lowered the [18F]nifene binding by more than 50% in anterior cingulate. Thus [18F]nifene offers a valuable tool for PET imaging studies of PD.
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Liu EYL, Mak S, Kong X, Xia Y, Kwan KKL, Xu ML, Tsim KWK. Tacrine Induces Endoplasmic Reticulum-Stressed Apoptosis via Disrupting the Proper Assembly of Oligomeric Acetylcholinesterase in Cultured Neuronal Cells. Mol Pharmacol 2021; 100:456-469. [PMID: 34531295 DOI: 10.1124/molpharm.121.000269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 08/23/2021] [Indexed: 12/12/2022] Open
Abstract
Acetylcholinesterase inhibitors (AChEIs), the most developed treatment strategies for Alzheimer's disease (AD), will be used in clinic for, at least, the next decades. Their side effects are in highly variable from drug to drug with mechanisms remaining to be fully established. The withdrawal of tacrine (Cognex) in the market makes it as an interesting case study. Here, we found tacrine could disrupt the proper trafficking of proline-rich membrane anchor-linked tetrameric acetylcholinesterase (AChE) in the endoplasmic reticulum (ER). The exposure of tacrine in cells expressing AChE, e.g., neurons, caused an accumulation of the misfolded AChE in the ER. This misfolded enzyme was not able to transport to the Golgi/plasma membrane, which subsequently induced ER stress and its downstream signaling cascade of unfolded protein response. Once the stress was overwhelming, the cooperation of ER with mitochondria increased the loss of mitochondrial membrane potential. Eventually, the tacrine-exposed cells lost homeostasis and underwent apoptosis. The ER stress and apoptosis, induced by tacrine, were proportional to the amount of AChE. Other AChEIs (rivastigmine, bis(3)-cognitin, daurisoline, and dauricine) could cause the same problem as tacrine by inducing ER stress in neuronal cells. The results provide guidance for the drug design and discovery of AChEIs for AD treatment. SIGNIFICANCE STATEMENT: Acetylcholinesterase inhibitors (AChEIs) are the most developed treatment strategies for Alzheimer's disease (AD) and will be used in clinic for at least the next decades. This study reports that tacrine and other AChEIs disrupt the proper trafficking of acetylcholinesterase in the endoplasmic reticulum. Eventually, the apoptosis of neurons and other cells are induced. The results provide guidance for drug design and discovery of AChEIs for AD treatment.
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Affiliation(s)
- Etta Y L Liu
- Key Laboratory of Food Quality and Safety of Guangdong Province, College of Food Science, South China Agricultural University, Guangzhou, China (E.Y.L.L.); Institute of Pharmaceutical & Food Engineering, Chinese Medicine Master Studio of Wang Shimin, Shanxi University of Chinese Medicine, Jinzhong, China (X.K.); Shenzhen Key Laboratory of Edible and Medicinal Bioresources, SRI, The Hong Kong University of Science and Technology Shenzhen, China (S.M., X.K., Y.X., K.K.L.K., M.L.X., K.W.K.T.); and Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong, China (E.Y.L.L., S.M., Y.X., K.K.L.K., M.L.X., K.W.K.T.)
| | - Shinghung Mak
- Key Laboratory of Food Quality and Safety of Guangdong Province, College of Food Science, South China Agricultural University, Guangzhou, China (E.Y.L.L.); Institute of Pharmaceutical & Food Engineering, Chinese Medicine Master Studio of Wang Shimin, Shanxi University of Chinese Medicine, Jinzhong, China (X.K.); Shenzhen Key Laboratory of Edible and Medicinal Bioresources, SRI, The Hong Kong University of Science and Technology Shenzhen, China (S.M., X.K., Y.X., K.K.L.K., M.L.X., K.W.K.T.); and Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong, China (E.Y.L.L., S.M., Y.X., K.K.L.K., M.L.X., K.W.K.T.)
| | - Xiangpeng Kong
- Key Laboratory of Food Quality and Safety of Guangdong Province, College of Food Science, South China Agricultural University, Guangzhou, China (E.Y.L.L.); Institute of Pharmaceutical & Food Engineering, Chinese Medicine Master Studio of Wang Shimin, Shanxi University of Chinese Medicine, Jinzhong, China (X.K.); Shenzhen Key Laboratory of Edible and Medicinal Bioresources, SRI, The Hong Kong University of Science and Technology Shenzhen, China (S.M., X.K., Y.X., K.K.L.K., M.L.X., K.W.K.T.); and Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong, China (E.Y.L.L., S.M., Y.X., K.K.L.K., M.L.X., K.W.K.T.)
| | - Yingjie Xia
- Key Laboratory of Food Quality and Safety of Guangdong Province, College of Food Science, South China Agricultural University, Guangzhou, China (E.Y.L.L.); Institute of Pharmaceutical & Food Engineering, Chinese Medicine Master Studio of Wang Shimin, Shanxi University of Chinese Medicine, Jinzhong, China (X.K.); Shenzhen Key Laboratory of Edible and Medicinal Bioresources, SRI, The Hong Kong University of Science and Technology Shenzhen, China (S.M., X.K., Y.X., K.K.L.K., M.L.X., K.W.K.T.); and Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong, China (E.Y.L.L., S.M., Y.X., K.K.L.K., M.L.X., K.W.K.T.)
| | - Kenneth K L Kwan
- Key Laboratory of Food Quality and Safety of Guangdong Province, College of Food Science, South China Agricultural University, Guangzhou, China (E.Y.L.L.); Institute of Pharmaceutical & Food Engineering, Chinese Medicine Master Studio of Wang Shimin, Shanxi University of Chinese Medicine, Jinzhong, China (X.K.); Shenzhen Key Laboratory of Edible and Medicinal Bioresources, SRI, The Hong Kong University of Science and Technology Shenzhen, China (S.M., X.K., Y.X., K.K.L.K., M.L.X., K.W.K.T.); and Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong, China (E.Y.L.L., S.M., Y.X., K.K.L.K., M.L.X., K.W.K.T.)
| | - Miranda L Xu
- Key Laboratory of Food Quality and Safety of Guangdong Province, College of Food Science, South China Agricultural University, Guangzhou, China (E.Y.L.L.); Institute of Pharmaceutical & Food Engineering, Chinese Medicine Master Studio of Wang Shimin, Shanxi University of Chinese Medicine, Jinzhong, China (X.K.); Shenzhen Key Laboratory of Edible and Medicinal Bioresources, SRI, The Hong Kong University of Science and Technology Shenzhen, China (S.M., X.K., Y.X., K.K.L.K., M.L.X., K.W.K.T.); and Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong, China (E.Y.L.L., S.M., Y.X., K.K.L.K., M.L.X., K.W.K.T.)
| | - Karl W K Tsim
- Key Laboratory of Food Quality and Safety of Guangdong Province, College of Food Science, South China Agricultural University, Guangzhou, China (E.Y.L.L.); Institute of Pharmaceutical & Food Engineering, Chinese Medicine Master Studio of Wang Shimin, Shanxi University of Chinese Medicine, Jinzhong, China (X.K.); Shenzhen Key Laboratory of Edible and Medicinal Bioresources, SRI, The Hong Kong University of Science and Technology Shenzhen, China (S.M., X.K., Y.X., K.K.L.K., M.L.X., K.W.K.T.); and Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong, China (E.Y.L.L., S.M., Y.X., K.K.L.K., M.L.X., K.W.K.T.)
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Samra GK, Intskirveli I, Govind AP, Liang C, Lazar R, Green WN, Metherate R, Mukherjee J. Development of fluorescence imaging probes for nicotinic acetylcholine α4β2 ∗ receptors. Bioorg Med Chem Lett 2018; 28:371-377. [PMID: 29277457 DOI: 10.1016/j.bmcl.2017.12.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 12/13/2017] [Accepted: 12/16/2017] [Indexed: 11/29/2022]
Abstract
Nicotinic acetylcholine α4β2∗ receptors (nAChRs) are implicated in various neurodegenerative diseases and smoking addiction. Imaging of brain high-affinity α4β2∗ nAChRs at the cellular and subcellular levels would greatly enhance our understanding of their functional role. Since better resolution could be achieved with fluorescent probes, using our previously developed positron emission tomography (PET) imaging agent [18F]nifrolidine, we report here design, synthesis and evaluation of two fluorescent probes, nifrodansyl and nifrofam for imaging α4β2∗ nAChRs. The nifrodansyl and nifrofam exhibited nanomolar affinities for the α4β2∗ nAChRs in [3H]cytisine-radiolabeled rat brain slices. Nifrofam labeling was observed in α4β2∗ nAChR-expressing HEK cells and was upregulated by nicotine exposure. Nifrofam co-labeled cell-surface α4β2∗ nAChRs, labeled with antibodies specific for a β2 subunit extracellular epitope indicating that nifrofam labels α4β2∗ nAChR high-affinity binding sites. Mouse brain slices exhibited discrete binding of nifrofam in the auditory cortex showing promise for examining cellular distribution of α4β2∗ nAChRs in brain regions.
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Affiliation(s)
- Gurleen K Samra
- Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA 92697, United States
| | - Irakli Intskirveli
- Department of Neurobiology and Behavior, University of California-Irvine, Irvine, CA 92697, United States
| | - Anitha P Govind
- Department of Neurobiology, University of Chicago, IL 60637, United States
| | - Christopher Liang
- Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA 92697, United States
| | - Ronit Lazar
- Department of Neurobiology and Behavior, University of California-Irvine, Irvine, CA 92697, United States
| | - William N Green
- Department of Neurobiology, University of Chicago, IL 60637, United States
| | - Raju Metherate
- Department of Neurobiology and Behavior, University of California-Irvine, Irvine, CA 92697, United States
| | - Jogeshwar Mukherjee
- Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA 92697, United States; Department of Biomedical Engineering, University of California-Irvine, Irvine, CA 92697, United States.
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Mukherjee J, Lao PJ, Betthauser TJ, Samra GK, Pan ML, Patel IH, Liang C, Metherate R, Christian BT. Human brain imaging of nicotinic acetylcholine α4β2* receptors using [ 18 F]Nifene: Selectivity, functional activity, toxicity, aging effects, gender effects, and extrathalamic pathways. J Comp Neurol 2017; 526:80-95. [PMID: 28875553 DOI: 10.1002/cne.24320] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 08/22/2017] [Accepted: 08/23/2017] [Indexed: 02/06/2023]
Abstract
Nicotinic acetylcholinergic receptors (nAChR's) have been implicated in several brain disorders, including addiction, Parkinson's disease, Alzheimer's disease and schizophrenia. Here we report in vitro selectivity and functional properties, toxicity in rats, in vivo evaluation in humans, and comparison across species of [18 F]Nifene, a fast acting PET imaging agent for α4β2* nAChRs. Nifene had subnanomolar affinities for hα2β2 (0.34 nM), hα3β2 (0.80 nM) and hα4β2 (0.83 nM) nAChR but weaker (27-219 nM) for hβ4 nAChR subtypes and 169 nM for hα7 nAChR. In functional assays, Nifene (100 μM) exhibited 14% agonist and >50% antagonist characteristics. In 14-day acute toxicity in rats, the maximum tolerated dose (MTD) and the no observed adverse effect level (NOAEL) were estimated to exceed 40 μg/kg/day (278 μg/m2 /day). In human PET studies, [18 F]Nifene (185 MBq; <0.10 μg) was well tolerated with no adverse effects. Distribution volume ratios (DVR) of [18 F]Nifene in white matter thalamic radiations were ∼1.6 (anterior) and ∼1.5 (superior longitudinal fasciculus). Habenula known to contain α3β2 nAChR exhibited low levels of [18 F]Nifene binding while the red nucleus with α2β2 nAChR had DVR ∼1.6-1.7. Females had higher [18 F]Nifene binding in all brain regions, with thalamus showing >15% than males. No significant aging effect was observed in [18 F]Nifene binding over 5 decades. In all species (mice, rats, monkeys, and humans) thalamus showed highest [18 F]Nifene binding with reference region ratios >2 compared to extrathalamic regions. Our findings suggest that [18 F]Nifene PET may be used to study α4β2* nAChRs in various CNS disorders and for translational research.
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Affiliation(s)
- Jogeshwar Mukherjee
- Preclinical Imaging, Department of Radiological Sciences, University of California, Irvine, California
| | - Patrick J Lao
- Department of Medical Physics and Waisman Center, University of Wisconsin, Madison, Wisconsin
| | - Tobey J Betthauser
- Department of Medical Physics and Waisman Center, University of Wisconsin, Madison, Wisconsin
| | - Gurleen K Samra
- Preclinical Imaging, Department of Radiological Sciences, University of California, Irvine, California
| | - Min-Liang Pan
- Preclinical Imaging, Department of Radiological Sciences, University of California, Irvine, California
| | - Ishani H Patel
- Preclinical Imaging, Department of Radiological Sciences, University of California, Irvine, California
| | | | - Raju Metherate
- Department of Neurobiology and Behavior, University of California, Irvine, California
| | - Bradley T Christian
- Department of Medical Physics and Waisman Center, University of Wisconsin, Madison, Wisconsin
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Betthauser TJ, Hillmer AT, Lao PJ, Ehlerding E, Mukherjee J, Stone CK, Christian BT. Human biodistribution and dosimetry of [ 18F]nifene, an α4β2* nicotinic acetylcholine receptor PET tracer. Nucl Med Biol 2017; 55:7-11. [PMID: 28963927 DOI: 10.1016/j.nucmedbio.2017.08.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 08/14/2017] [Accepted: 08/15/2017] [Indexed: 11/30/2022]
Abstract
INTRODUCTION The α4β2* nicotinic acetylcholine receptor (nAChR) system is implicated in many neuropsychiatric pathologies. [18F]Nifene is a positron emission tomography (PET) ligand that has shown promise for in vivo imaging of the α4β2* nAChR system in preclinical models and humans. This work establishes the radiation burden associated with [18F]nifene PET scans in humans. METHODS Four human subjects (2M, 2F) underwent whole-body PET/CT scans to determine the human biodistribution of [18F]nifene. Source organs were identified and time-activity-curves (TACs) were extracted from the PET time-series. Dose estimates were calculated for each subject using OLINDA/EXM v1.1. RESULTS [18F]Nifene was well tolerated by all subjects with no adverse events reported. The mean whole-body effective dose was 28.4±3.8 mSv/MBq without bladder voiding, and 22.6±1.9 mSv/MBq with hourly micturition. The urinary bladder radiation dose limited the maximum injected dose for a single scan to 278 MBq without urinary bladder voiding, and 519 MBq with hourly voiding. CONCLUSIONS [18F]Nifene is a safe PET radioligand for imaging the α4β2* nAChR system in humans. ADVANCES IN KNOWLEDGE AND IMPLICATIONS FOR PATIENT CARE This works presents human internal dosimetry for [18F]nifene in humans for the first time. These results facilitate safe development of future [18F]nifene studies to image the α4β2* nAChR system in humans.
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Affiliation(s)
- Tobey J Betthauser
- Department of Medical Physics, University of Wisconsin - Madison School of Medicine and Public Health, Madison, WI, USA; Waisman Laboratory for Brain Imaging and Behavior, University of Wisconsin - Madison School of Medicine and Public Health, Madison, WI, USA.
| | - Ansel T Hillmer
- Departments of Radiology and Biomedical Imaging, Psychiatry, Yale School of Medicine, New Haven, CT, USA
| | - Patrick J Lao
- Department of Medical Physics, University of Wisconsin - Madison School of Medicine and Public Health, Madison, WI, USA; Waisman Laboratory for Brain Imaging and Behavior, University of Wisconsin - Madison School of Medicine and Public Health, Madison, WI, USA
| | - Emily Ehlerding
- Department of Medical Physics, University of Wisconsin - Madison School of Medicine and Public Health, Madison, WI, USA
| | - Jogeshwar Mukherjee
- Preclinical Imaging, Department of Radiological Sciences, University of California - Irvine, Irvine, CA, USA
| | - Charles K Stone
- Department of Medicine, University of Wisconsin - Madison School of Medicine and Public Health, Madison, WI, USA
| | - Bradley T Christian
- Department of Medical Physics, University of Wisconsin - Madison School of Medicine and Public Health, Madison, WI, USA; Waisman Laboratory for Brain Imaging and Behavior, University of Wisconsin - Madison School of Medicine and Public Health, Madison, WI, USA
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Determine equilibrium dissociation constant of drug-membrane receptor affinity using the cell membrane chromatography relative standard method. J Chromatogr A 2017; 1503:12-20. [DOI: 10.1016/j.chroma.2017.04.053] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 04/24/2017] [Accepted: 04/25/2017] [Indexed: 12/17/2022]
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Lao PJ, Betthauser TJ, Tudorascu DL, Barnhart TE, Hillmer AT, Stone CK, Mukherjee J, Christian BT. [ 18 F]Nifene test-retest reproducibility in first-in-human imaging of α4β2* nicotinic acetylcholine receptors. Synapse 2017; 71. [PMID: 28420041 DOI: 10.1002/syn.21981] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 04/11/2017] [Accepted: 04/12/2017] [Indexed: 11/10/2022]
Abstract
The aim of this study was to examine the suitability of [18 F]nifene, a novel α4β2* nicotinic acetylcholine receptor (nAChR) radiotracer, for in vivo brain imaging in a first-in-human study. METHODS Eight healthy subjects (4 M,4 F;21-69,44 ± 21 yrs) underwent a [18 F]nifene positron emission tomography scan (200 ± 3.7 MBq), and seven underwent a second scan within 58 ± 31 days. Regional estimates of DVR were measured using the multilinear reference tissue model (MRTM2) with the corpus callosum as reference region. DVR reproducibility was evaluated with test-retest variability (TRV) and intraclass correlation coefficient (ICC). RESULTS The DVR ranged from 1.3 to 2.5 across brain regions with a TRV of 0-7%, and did not demonstrate a systematic difference between test and retest. The ICCs ranged from 0.2 to 0.9. DVR estimates were stable after 40 min. CONCLUSION The binding profile and tracer kinetics of [18 F]nifene make it a promising α4β2* nAChR radiotracer for scientific research in humans, with reliable DVR test-retest reproducibility.
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Affiliation(s)
- Patrick J Lao
- Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin, 53705.,Waisman Laboratory for Brain Imaging and Behavior, Madison, Wisconsin, 53705
| | - Tobey J Betthauser
- Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin, 53705.,Waisman Laboratory for Brain Imaging and Behavior, Madison, Wisconsin, 53705
| | - Dana L Tudorascu
- Department of Medicine, Biostatistics, Psychiatry, and Clinical and Translational Science, University of Pittsburgh, Pittsburgh, Pennsylvania, 15213
| | - Todd E Barnhart
- Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin, 53705
| | - Ansel T Hillmer
- Department of Radiology and Biomedical Imaging, and Psychiatry, Yale University, New Haven, Connecticut, 06520
| | - Charles K Stone
- Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, 53705
| | - Jogeshwar Mukherjee
- Department of Radiological Sciences, University of California-Irvine, Irvine, California, 92697
| | - Bradley T Christian
- Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin, 53705.,Waisman Laboratory for Brain Imaging and Behavior, Madison, Wisconsin, 53705.,Department of Psychiatry, University of Wisconsin-Madison, Madison, Wisconsin, 53705
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Kassenbrock A, Vasdev N, Liang SH. Selected PET Radioligands for Ion Channel Linked Neuroreceptor Imaging: Focus on GABA, NMDA and nACh Receptors. Curr Top Med Chem 2017; 16:1830-42. [PMID: 26975506 DOI: 10.2174/1568026616666160315142457] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Revised: 08/01/2015] [Accepted: 08/03/2015] [Indexed: 12/11/2022]
Abstract
Positron emission tomography (PET) neuroimaging of ion channel linked receptors is a developing area of preclinical and clinical research. The present review focuses on recent advances with radiochemistry, preclinical and clinical PET imaging studies of three receptors that are actively pursued in neuropsychiatric drug discovery: namely the γ-aminobutyric acid-benzodiazapine (GABA) receptor, nicotinic acetylcholine receptor (nAChR), and N-methyl-D-aspartate (NMDA) receptor. Recent efforts to develop new PET radioligands for these targets with improved brain uptake, selectivity, stability and pharmacokinetics are highlighted.
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Affiliation(s)
| | | | - Steven H Liang
- Division of Nuclear Medicine and Molecular Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
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Imaging α4β2 Nicotinic Acetylcholine Receptors (nAChRs) in Baboons with [18F]XTRA, a Radioligand with Improved Specific Binding in Extra-Thalamic Regions. Mol Imaging Biol 2016; 19:280-288. [DOI: 10.1007/s11307-016-0999-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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11
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Yang YC, Hu CC, Lai YC. Non-additive modulation of synaptic transmission by serotonin, adenosine, and cholinergic modulators in the sensory thalamus. Front Cell Neurosci 2015; 9:60. [PMID: 25852468 PMCID: PMC4360759 DOI: 10.3389/fncel.2015.00060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Accepted: 02/09/2015] [Indexed: 11/13/2022] Open
Abstract
The thalamus relays sensory information to the cortex. Oscillatory activities of the thalamocortical network are modulated by monoamines, acetylcholine, and adenosine, and could be the key features characteristic of different vigilance states. Although the thalamus is almost always subject to the actions of more than just one neuromodulators, reports on the modulatory effect of coexisting neuromodulators on thalamic synaptic transmission are unexpectedly scarce. We found that, if present alone, monoamine or adenosine decreases retinothalamic synaptic strength and short-term depression, whereas cholinergic modulators generally enhance postsynaptic response to presynaptic activity. However, coexistence of different modulators tends to produce non-additive effect, not predictable based on the action of individual modulators. Acetylcholine, acting via nicotinic receptors, can interact with either serotonin or adenosine to abolish most short-term synaptic depression. Moreover, the coexistence of adenosine and monoamine, with or without acetylcholine, results in robustly decreased synaptic strength and transforms short-term synaptic depression to facilitation. These findings are consistent with a view that acetylcholine is essential for an "enriched" sensory flow through the thalamus, and the flow is trimmed down by concomitant monoamine or adenosine (presumably for the wakefulness and rapid-eye movement, or REM, sleep states, respectively). In contrast, concomitant adenosine and monoamine would lead to a markedly "deprived" (and high-pass filtered) sensory flow, and thus the dramatic decrease of monoamine may constitute the basic demarcation between non-REM and REM sleep. The collective actions of different neuromodulators on thalamic synaptic transmission thus could be indispensable for the understanding of network responsiveness in different vigilance states.
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Affiliation(s)
- Ya-Chin Yang
- Department of Biomedical Sciences, College of Medicine, Chang Gung University Tao-Yuan, Taiwan ; Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University Tao-Yuan, Taiwan
| | - Chun-Chang Hu
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University Tao-Yuan, Taiwan ; Department of Neurosurgery, Chang-Gung Memorial Hospital Linkou, Taiwan
| | - Yi-Chen Lai
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University Tao-Yuan, Taiwan
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Nondopaminergic Neurotransmission in the Pathophysiology of Tourette Syndrome. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2013; 112:95-130. [DOI: 10.1016/b978-0-12-411546-0.00004-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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