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Goutal S, Tran T, Leroy C, Benhamouda N, Leterrier S, Saba W, Lafont B, Tartour É, Roelens M, Tournier N. Brain Glucose Metabolism as a Readout of the Central Nervous System Impact of Cigarette Smoke Exposure and Withdrawal and the Effects of NFL-101, as an Immune-Based Drug Candidate for Smoking Cessation Therapy. ACS Chem Neurosci 2024. [PMID: 38875216 DOI: 10.1021/acschemneuro.4c00204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2024] Open
Abstract
Neuroimaging biomarkers are needed to investigate the impact of smoking withdrawal on brain function. NFL-101 is a denicotinized aqueous extract of tobacco leaves currently investigated as an immune-based smoking cessation therapy in humans. However, the immune response to NFL-101 and its ability to induce significant changes in brain function remain to be demonstrated. Brain glucose metabolism was investigated using [18F]fluoro-deoxy-glucose ([18F]FDG) PET imaging in a mouse model of cigarette smoke exposure (CSE, 4-week whole-body inhalation, twice daily). Compared with control animals, the relative uptake of [18F]FDG in CSE mice was decreased in the thalamus and brain stem (p < 0.001, n = 14 per group) and increased in the hippocampus, cortex, cerebellum, and olfactory bulb (p < 0.001). NFL-101 induced a humoral immune response (specific IgGs) in mice and activated human natural-killer lymphocytes in vitro. In CSE mice, but not in control mice, single-dose NFL-101 significantly increased [18F]FDG uptake in the thalamus (p < 0.01), thus restoring normal brain glucose metabolism after 2-day withdrawal in this nicotinic receptor-rich region. In tobacco research, [18F]FDG PET imaging provides a quantitative method to evaluate changes in the brain function associated with the withdrawal phase. This method also showed the CNS effects of NFL-101, with translational perspectives for future clinical evaluation in smokers.
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Affiliation(s)
- Sébastien Goutal
- CEA, CNRS, Inserm, BioMaps, Université Paris-Saclay, Orsay 91401, France
| | - Thi Tran
- Université Paris Cité, INSERM, PARCC, Paris 75015, France
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Hôpital Necker, Paris 75015,France
| | - Claire Leroy
- CEA, CNRS, Inserm, BioMaps, Université Paris-Saclay, Orsay 91401, France
| | - Nadine Benhamouda
- Université Paris Cité, INSERM, PARCC, Paris 75015, France
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Hôpital Necker, Paris 75015,France
| | - Sarah Leterrier
- CEA, CNRS, Inserm, BioMaps, Université Paris-Saclay, Orsay 91401, France
| | - Wadad Saba
- CEA, CNRS, Inserm, BioMaps, Université Paris-Saclay, Orsay 91401, France
| | | | - Éric Tartour
- Université Paris Cité, INSERM, PARCC, Paris 75015, France
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Hôpital Necker, Paris 75015,France
| | - Marie Roelens
- Université Paris Cité, INSERM, PARCC, Paris 75015, France
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Hôpital Necker, Paris 75015,France
| | - Nicolas Tournier
- CEA, CNRS, Inserm, BioMaps, Université Paris-Saclay, Orsay 91401, France
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Sunassee ED, Jardim-Perassi BV, Madonna MC, Ordway B, Ramanujam N. Metabolic Imaging as a Tool to Characterize Chemoresistance and Guide Therapy in Triple-Negative Breast Cancer (TNBC). Mol Cancer Res 2023; 21:995-1009. [PMID: 37343066 PMCID: PMC10592445 DOI: 10.1158/1541-7786.mcr-22-1004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 04/07/2023] [Accepted: 06/15/2023] [Indexed: 06/23/2023]
Abstract
After an initial response to chemotherapy, tumor relapse is frequent. This event is reflective of both the spatiotemporal heterogeneities of the tumor microenvironment as well as the evolutionary propensity of cancer cell populations to adapt to variable conditions. Because the cause of this adaptation could be genetic or epigenetic, studying phenotypic properties such as tumor metabolism is useful as it reflects molecular, cellular, and tissue-level dynamics. In triple-negative breast cancer (TNBC), the characteristic metabolic phenotype is a highly fermentative state. However, during treatment, the spatial and temporal dynamics of the metabolic landscape are highly unstable, with surviving populations taking on a variety of metabolic states. Thus, longitudinally imaging tumor metabolism provides a promising approach to inform therapeutic strategies, and to monitor treatment responses to understand and mitigate recurrence. Here we summarize some examples of the metabolic plasticity reported in TNBC following chemotherapy and review the current metabolic imaging techniques available in monitoring chemotherapy responses clinically and preclinically. The ensemble of imaging technologies we describe has distinct attributes that make them uniquely suited for a particular length scale, biological model, and/or features that can be captured. We focus on TNBC to highlight the potential of each of these technological advances in understanding evolution-based therapeutic resistance.
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Affiliation(s)
- Enakshi D. Sunassee
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | | | - Megan C. Madonna
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Bryce Ordway
- Department of Cancer Physiology, Moffitt Cancer Center, Tampa, FL 33612, USA
- Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| | - Nirmala Ramanujam
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC 27708, USA
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Tsagkaris S, Yau EKC, McClelland V, Papandreou A, Siddiqui A, Lumsden DE, Kaminska M, Guedj E, Hammers A, Lin JP. Metabolic patterns in brain 18F-fluorodeoxyglucose PET relate to aetiology in paediatric dystonia. Brain 2023; 146:2512-2523. [PMID: 36445406 PMCID: PMC10232264 DOI: 10.1093/brain/awac439] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 10/24/2022] [Accepted: 11/08/2022] [Indexed: 12/09/2023] Open
Abstract
There is a lack of imaging markers revealing the functional characteristics of different brain regions in paediatric dystonia. In this observational study, we assessed the utility of [18F]2-fluoro-2-deoxy-D-glucose (FDG)-PET in understanding dystonia pathophysiology by revealing specific resting awake brain glucose metabolism patterns in different childhood dystonia subgroups. PET scans from 267 children with dystonia being evaluated for possible deep brain stimulation surgery between September 2007 and February 2018 at Evelina London Children's Hospital (ELCH), UK, were examined. Scans without gross anatomical abnormality (e.g. large cysts, significant ventriculomegaly; n = 240) were analysed with Statistical Parametric Mapping (SPM12). Glucose metabolism patterns were examined in the 144/240 (60%) cases with the 10 commonest childhood-onset dystonias, focusing on nine anatomical regions. A group of 39 adult controls was used for comparisons. The genetic dystonias were associated with the following genes: TOR1A, THAP1, SGCE, KMT2B, HPRT1 (Lesch Nyhan disease), PANK2 and GCDH (Glutaric Aciduria type 1). The acquired cerebral palsy (CP) cases were divided into those related to prematurity (CP-Preterm), neonatal jaundice/kernicterus (CP-Kernicterus) and hypoxic-ischaemic encephalopathy (CP-Term). Each dystonia subgroup had distinct patterns of altered FDG-PET uptake. Focal glucose hypometabolism of the pallidi, putamina or both, was the commonest finding, except in PANK2, where basal ganglia metabolism appeared normal. HPRT1 uniquely showed glucose hypometabolism across all nine cerebral regions. Temporal lobe glucose hypometabolism was found in KMT2B, HPRT1 and CP-Kernicterus. Frontal lobe hypometabolism was found in SGCE, HPRT1 and PANK2. Thalamic and brainstem hypometabolism were seen only in HPRT1, CP-Preterm and CP-term dystonia cases. The combination of frontal and parietal lobe hypermetabolism was uniquely found in CP-term cases. PANK2 cases showed a distinct combination of parietal hypermetabolism with cerebellar hypometabolism but intact putaminal-pallidal glucose metabolism. HPRT1, PANK2, CP-kernicterus and CP-preterm cases had cerebellar and insula glucose hypometabolism as well as parietal glucose hypermetabolism. The study findings offer insights into the pathophysiology of dystonia and support the network theory for dystonia pathogenesis. 'Signature' patterns for each dystonia subgroup could be a useful biomarker to guide differential diagnosis and inform personalized management strategies.
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Affiliation(s)
- Stavros Tsagkaris
- Children’s Neurosciences, Complex Motor Disorders Service (CMDS), Evelina London Children's Hospital, Guy's and St Thomas’ NHS Foundation Trust (GSTT), London SE1 7EH, UK
- King’s College London & Guy’s and St Thomas’ PET Centre, Division of Biomedical Engineering and Imaging Sciences, King’s College London, London SE1 7EH, UK
| | - Eric K C Yau
- Department of Paediatrics & Adolescent Medicine, Princess Margaret Hospital, Kowloon, Hong Kong
| | - Verity McClelland
- Children’s Neurosciences, Complex Motor Disorders Service (CMDS), Evelina London Children's Hospital, Guy's and St Thomas’ NHS Foundation Trust (GSTT), London SE1 7EH, UK
- Department of Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London SE5 8AF, UK
| | - Apostolos Papandreou
- Children’s Neurosciences, Complex Motor Disorders Service (CMDS), Evelina London Children's Hospital, Guy's and St Thomas’ NHS Foundation Trust (GSTT), London SE1 7EH, UK
- Developmental Neurosciences, Zayed Centre for Research into Rare Disease in Children, University College London Great Ormond Street Institute of Child Health, London WC1N 1DZ, UK
| | - Ata Siddiqui
- Neuroradiology Department, Evelina London Children's Hospital, Guy's and St Thomas’ NHS Foundation Trust (GSTT), London SE1 7EH, UK
| | - Daniel E Lumsden
- Children’s Neurosciences, Complex Motor Disorders Service (CMDS), Evelina London Children's Hospital, Guy's and St Thomas’ NHS Foundation Trust (GSTT), London SE1 7EH, UK
- Perinatal Imaging, Division of Biomedical Engineering and Imaging Sciences, King’s College London, London SE1 7EH, UK
| | - Margaret Kaminska
- Children’s Neurosciences, Complex Motor Disorders Service (CMDS), Evelina London Children's Hospital, Guy's and St Thomas’ NHS Foundation Trust (GSTT), London SE1 7EH, UK
| | - Eric Guedj
- CERIMED, Nuclear Medicine Department, Aix Marseille Universite, APHM, CNRS, Centrale Marseille, Institut Fresnel, Timone Hospital, 13397 Marseille, France
| | - Alexander Hammers
- King’s College London & Guy’s and St Thomas’ PET Centre, Division of Biomedical Engineering and Imaging Sciences, King’s College London, London SE1 7EH, UK
| | - Jean-Pierre Lin
- Children’s Neurosciences, Complex Motor Disorders Service (CMDS), Evelina London Children's Hospital, Guy's and St Thomas’ NHS Foundation Trust (GSTT), London SE1 7EH, UK
- Women and Children’s Health Institute Faculty of Life Sciences & Medicine, Kings Health Partners, King’s College London, London SE1 7EH, UK
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Jiang Y, Peng C, Zhu Y, Ma X, Xu G, Yuan J, Wang X, Carson P. Biomedical Photoacoustic Imaging With Unknown Spatially Distributed Ultrasound Sensor Array. IEEE Trans Biomed Eng 2021; 68:2948-2956. [PMID: 33534699 DOI: 10.1109/tbme.2021.3056715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE With the growth of interest in different medical study on biological function, non-invasive photoacoustic imaging of biological tissue attracts the interests for researchers. To eliminate the limited angle effect of photoacoustic imaging based on ultrasound linear array, spatially distributed ultrasound sensor array is applied. The accurate sensor array position determines the quality of the imaging results. In this study, we proposed three methods based on photoacoustic and ultrasound signals to enhance the imaging quality using a 256-element full-ring array. METHODS Groups of photoacoustic and ultrasound signals are used to regress the position of each element sensor. RESULT In phantom study and mouse brain study, photoacoustic imaging results can both yield details clearly with average error rate of less than 1% (50 [Formula: see text]). CONCLUSION The performance of our three methods have proved that they can be potentially applied to other ultrasound-based medical imaging studies with unknown distributed positions of sensor array to enhance the imaging quality. SIGNIFICANCE The proposed methods can contribute to precise biomedical imaging with unknown distributed positions of sensor array in different application scenarios.
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Kim K, Choi HY, Pak K, Jeon H. Changes in brain glucose metabolism following traumatic optic neuropathy in rats. ALL LIFE 2021. [DOI: 10.1080/26895293.2020.1861110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Affiliation(s)
- Keunyoung Kim
- Department of Nuclear Medicine, Pusan National University Hospital, Busan, South Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, South Korea
| | - Hee-young Choi
- Biomedical Research Institute, Pusan National University Hospital, Busan, South Korea
- Department of Ophthalmology, Pusan National University Hospital, Busan, South Korea
| | - Kyoungjune Pak
- Department of Nuclear Medicine, Pusan National University Hospital, Busan, South Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, South Korea
| | - Hyeshin Jeon
- Biomedical Research Institute, Pusan National University Hospital, Busan, South Korea
- Department of Ophthalmology, Pusan National University Hospital, Busan, South Korea
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Slosky LM, Bai Y, Toth K, Ray C, Rochelle LK, Badea A, Chandrasekhar R, Pogorelov VM, Abraham DM, Atluri N, Peddibhotla S, Hedrick MP, Hershberger P, Maloney P, Yuan H, Li Z, Wetsel WC, Pinkerton AB, Barak LS, Caron MG. β-Arrestin-Biased Allosteric Modulator of NTSR1 Selectively Attenuates Addictive Behaviors. Cell 2020; 181:1364-1379.e14. [PMID: 32470395 PMCID: PMC7466280 DOI: 10.1016/j.cell.2020.04.053] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 01/21/2020] [Accepted: 04/24/2020] [Indexed: 12/17/2022]
Abstract
Small molecule neurotensin receptor 1 (NTSR1) agonists have been pursued for more than 40 years as potential therapeutics for psychiatric disorders, including drug addiction. Clinical development of NTSR1 agonists has, however, been precluded by their severe side effects. NTSR1, a G protein-coupled receptor (GPCR), signals through the canonical activation of G proteins and engages β-arrestins to mediate distinct cellular signaling events. Here, we characterize the allosteric NTSR1 modulator SBI-553. This small molecule not only acts as a β-arrestin-biased agonist but also extends profound β-arrestin bias to the endogenous ligand by selectively antagonizing G protein signaling. SBI-553 shows efficacy in animal models of psychostimulant abuse, including cocaine self-administration, without the side effects characteristic of balanced NTSR1 agonism. These findings indicate that NTSR1 G protein and β-arrestin activation produce discrete and separable physiological effects, thus providing a strategy to develop safer GPCR-targeting therapeutics with more directed pharmacological action.
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Affiliation(s)
- Lauren M Slosky
- Department of Cell Biology, Duke University, Durham, NC 27710, USA
| | - Yushi Bai
- Department of Cell Biology, Duke University, Durham, NC 27710, USA
| | - Krisztian Toth
- Department of Cell Biology, Duke University, Durham, NC 27710, USA; Department of Pharmaceutical Sciences, Campbell University, Buies Creek, NC 27506, USA
| | - Caroline Ray
- Department of Cell Biology, Duke University, Durham, NC 27710, USA
| | | | - Alexandra Badea
- Departments of Radiology and Neurology, Brain Imaging and Analysis Center, Duke University, Durham, NC 27710, USA
| | | | - Vladimir M Pogorelov
- Department of Psychiatry and Behavioral Sciences, Duke University, Durham, NC 27710, USA
| | - Dennis M Abraham
- Department of Medicine, Division of Cardiology and Duke Cardiovascular Physiology Core, Duke University, Durham, NC 27710, USA
| | - Namratha Atluri
- Department of Cell Biology, Duke University, Durham, NC 27710, USA
| | - Satyamaheshwar Peddibhotla
- Conrad Prebys Center for Chemical Genomics at Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA
| | - Michael P Hedrick
- Conrad Prebys Center for Chemical Genomics at Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA
| | - Paul Hershberger
- Conrad Prebys Center for Chemical Genomics at Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA
| | - Patrick Maloney
- Conrad Prebys Center for Chemical Genomics at Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA
| | - Hong Yuan
- Department of Radiology, Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Zibo Li
- Department of Radiology, Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; UNC Linebarger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - William C Wetsel
- Department of Cell Biology, Duke University, Durham, NC 27710, USA; Department of Psychiatry and Behavioral Sciences, Duke University, Durham, NC 27710, USA; Department of Neurobiology, Duke University, Durham, NC 27710, USA
| | - Anthony B Pinkerton
- Conrad Prebys Center for Chemical Genomics at Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA.
| | - Lawrence S Barak
- Department of Cell Biology, Duke University, Durham, NC 27710, USA.
| | - Marc G Caron
- Department of Cell Biology, Duke University, Durham, NC 27710, USA; Department of Neurobiology, Duke University, Durham, NC 27710, USA; Department of Medicine, Duke University, Durham, NC 27710, USA.
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Modeling Mixed Vascular and Alzheimer's Dementia Using Focal Subcortical Ischemic Stroke in Human ApoE4-TR:5XFAD Transgenic Mice. Transl Stroke Res 2020; 11:1064-1076. [PMID: 32086779 PMCID: PMC10075511 DOI: 10.1007/s12975-020-00786-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 01/14/2020] [Accepted: 02/03/2020] [Indexed: 10/25/2022]
Abstract
Subcortical white matter ischemic lesions are increasingly recognized to have pathologic overlap in individuals with Alzheimer's disease (AD). The interaction of white matter ischemic lesions with amyloid pathology seen in AD is poorly characterized. We designed a novel mouse model of subcortical white matter ischemic stroke and AD that can inform our understanding of the cellular and molecular mechanisms of mixed vascular and AD dementia. Subcortical white matter ischemic stroke underlying forelimb motor cortex was induced by local stereotactic injection of an irreversible eNOS inhibitor. Subcortical white matter ischemic stroke or sham procedures were performed on human ApoE4-targeted-replacement (TR):5XFAD mice at 8 weeks of age. Behavioral tests were done at 7, 10, 15, and 20 weeks. A subset of animals underwent 18FDG-PET/CT. At 20 weeks of age, brain tissue was examined for amyloid plaque accumulation and cellular changes. Compared with sham E4-TR:5XFAD mice, those with an early subcortical ischemic stroke showed a significant reduction in amyloid plaque burden in the region of cortex overlying the subcortical stroke. Cognitive performance was improved in E4-TR:5XFAD mice with stroke compared with sham E4-TR:5XFAD animals. Iba-1+ microglial cells in the region of cortex overlying the subcortical stroke were increased in number and morphologic complexity compared with sham E4-TR:5XFAD mice, suggesting that amyloid clearance may be promoted by an interaction between activated microglia and cortical neurons in response to subcortical stroke. This novel approach to modeling mixed vascular and AD dementia provides a valuable tool for dissecting the molecular interactions between these two common pathologies.
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Altered Brain Glucose Metabolism Assessed by 18F-FDG PET Imaging Is Associated with the Cognitive Impairment of CADASIL. Neuroscience 2019; 417:35-44. [PMID: 31394195 DOI: 10.1016/j.neuroscience.2019.07.048] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 07/26/2019] [Accepted: 07/29/2019] [Indexed: 12/26/2022]
Abstract
Recurrent stroke and cognitive impairment are the primary features of patients with cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL). The cognitive deficits in these patients are known to be correlated with structural brain changes, such as white matter lesions and lacunae, and resting-state functional connectivity in brain networks. However, the associations between changes in brain glucose metabolism based on 18F-2-fluoro-2-deoxy-D-glucose (18F-FDG) positron emission tomography (PET) imaging and cognitive scores in CADASIL patients remain unclear. In the present study, 24 CADASIL patients and 24 matched healthy controls underwent 18F-FDG PET imaging. Brain glucose metabolism was measured in all subjects and Pearson's correlation analyses were performed to evaluate relationships between abnormal glucose metabolism in various brain areas and cognitive scores. Compared to controls, CADASIL patients exhibited significantly lower metabolism in the right cerebellar posterior lobe, left cerebellar anterior lobe, bilateral thalamus and left limbic lobe. Additionally, hypermetabolism was observed in the left precentral and postcentral gyri. Importantly, glucose metabolism in the left limbic lobe was positively associated with cognitive scores on the Mini-Mental State Examination (MMSE). Furthermore, glucose metabolism in the left precentral gyri was negatively correlated with cognitive scores on the Montreal Cognitive Assessment (MoCA). The present findings provide strong support for the presence of altered brain glucose metabolism in CADASIL patients as well as the associations between abnormal metabolism and cognitive scales in this population. The present findings suggest that patterns of brain glucose metabolism may become useful markers of cognitive impairment in CADASIL patients.
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Mapping Changes of Whole Brain Blood Flow in Rats with Myocardial Ischemia/Reperfusion Injury Assessed by Positron Emission Tomography. Curr Med Sci 2019; 39:653-657. [DOI: 10.1007/s11596-019-2087-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 06/06/2019] [Indexed: 01/02/2023]
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10
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Salerno M, Ferrer E, Wei S, Li X, Gao W, Ouellette D, Balanoff A, Vaska P. Behavioral neuroimaging in birds using PET. J Neurosci Methods 2019; 317:157-164. [PMID: 30710608 DOI: 10.1016/j.jneumeth.2019.01.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 01/17/2019] [Accepted: 01/29/2019] [Indexed: 11/16/2022]
Abstract
BACKGROUND Birds comprise the most diverse group of terrestrial vertebrates. This success likely is related to the evolution of powered flight over 75 mya. Modern approaches for studying brain function, however, have yet to be fully adapted and applied to birds, especially as they relate to specific behaviors including flight. New method: We have developed a comprehensive set of in vivo experimental methods utilizing PET imaging with F-18 labeled fluorodeoxyglucose (FDG) to study regional changes in metabolism specifically related to flight, yet applicable to other behaviors as well. It incorporates approaches for selection of species, behavioral/imaging paradigm, animal preparation, radiotracer injection route, image quantification, and image analysis via an enhanced brain atlas. We also carried out preliminary modeling studies to better understand tracer kinetics. RESULTS The methods were successful in identifying brain regions statistically associated with flight using only 8 animals. Peak brain uptake of FDG between birds and rodents is similar despite much higher blood glucose levels in birds. We also confirmed that brain uptake of FDG steadily decreases after the initial peak and provide evidence that it may be related to greater dephosphorylation of FDG phosphate than that observed in mammals. Comparison with existing methods: FDG PET has been used in only a few studies of the bird brain. We introduce a new species, more realistic flight behavior, paired (test/retest) design, and improved quantification and analysis approaches. CONCLUSIONS The proposed imaging protocol is non-invasive yet sensitive to regional metabolic changes in the bird brain related to behavior.
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Affiliation(s)
- Michael Salerno
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, 11794-5230, USA
| | - Elizabeth Ferrer
- Department of Anatomical Sciences, Stony Brook University, Stony Brook, NY, 11794-8081, USA
| | - Shouyi Wei
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, 11794-5230, USA
| | - Xiang Li
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, 11794-5230, USA
| | - Wenrong Gao
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, 11794-5230, USA
| | - David Ouellette
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, 11794-5230, USA
| | - Amy Balanoff
- Johns Hopkins University, Center for Functional Anatomy and Evolution, Baltimore, MD, 21205, USA; American Museum of Natural History, Division of Paleontology, New York, NY, 10024, USA.
| | - Paul Vaska
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, 11794-5230, USA; Department of Radiology, Renaissance School of Medicine at Stony Brook University, Stony Brook, NY, USA.
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Bouter C, Henniges P, Franke TN, Irwin C, Sahlmann CO, Sichler ME, Beindorff N, Bayer TA, Bouter Y. 18F-FDG-PET Detects Drastic Changes in Brain Metabolism in the Tg4-42 Model of Alzheimer's Disease. Front Aging Neurosci 2019; 10:425. [PMID: 30670962 PMCID: PMC6333025 DOI: 10.3389/fnagi.2018.00425] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 12/07/2018] [Indexed: 12/19/2022] Open
Abstract
The evaluation of new therapeutic strategies in Alzheimer’s disease (AD) relies heavily on in vivo imaging and suitable animal models that mimic the pathological changes seen in patients. 18F-Fluorodeoxyglucose (18F-FDG)-positron-emission tomography (PET) is a well-established non-invasive imaging tool for monitoring changes in cerebral brain glucose metabolism in vivo. 18F-FDG-PET is used as a functional biomarker for AD as patients show an early and progressive reduction of cerebral glucose metabolism. However, earlier studies in preclinical models of AD showed conflicting results. The aim of this study was the evaluation of cerebral glucose metabolism in the Tg4–42 mouse model of AD using 18F-FDG-PET/magnetic resonance imaging (MRI). Tg4–42 mice show an age-dependent reduction in glucose metabolism together with severe neuron loss and memory deficits. Similar to AD patients early decrease in 18F-FDG uptake was already detected in young (3 months) Tg4–42 mice. The altered glucose metabolism coupled with age- and disease related cognitive decline of Tg4–42 mice make it a well-suited model for preclinical testing of AD-relevant therapeutics.
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Affiliation(s)
- Caroline Bouter
- Department of Nuclear Medicine, University Medical Center Göttingen (UMG), Georg-August-University, Göttingen, Germany
| | - Philipp Henniges
- Division of Molecular Psychiatry, Department of Psychiatry and Psychotherapy, University Medical Center Göttingen (UMG), Georg-August-University, Göttingen, Germany
| | - Timon N Franke
- Division of Molecular Psychiatry, Department of Psychiatry and Psychotherapy, University Medical Center Göttingen (UMG), Georg-August-University, Göttingen, Germany
| | - Caroline Irwin
- Division of Molecular Psychiatry, Department of Psychiatry and Psychotherapy, University Medical Center Göttingen (UMG), Georg-August-University, Göttingen, Germany
| | - Carsten Oliver Sahlmann
- Department of Nuclear Medicine, University Medical Center Göttingen (UMG), Georg-August-University, Göttingen, Germany
| | - Marius E Sichler
- Division of Molecular Psychiatry, Department of Psychiatry and Psychotherapy, University Medical Center Göttingen (UMG), Georg-August-University, Göttingen, Germany
| | - Nicola Beindorff
- Berlin Experimental Radionuclide Imaging Center (BERIC), Charité-University Medicine Berlin, Berlin, Germany
| | - Thomas A Bayer
- Division of Molecular Psychiatry, Department of Psychiatry and Psychotherapy, University Medical Center Göttingen (UMG), Georg-August-University, Göttingen, Germany
| | - Yvonne Bouter
- Division of Molecular Psychiatry, Department of Psychiatry and Psychotherapy, University Medical Center Göttingen (UMG), Georg-August-University, Göttingen, Germany
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Zhu C, Martin HL, Crouch BT, Martinez AF, Li M, Palmer GM, Dewhirst MW, Ramanujam N. Near-simultaneous quantification of glucose uptake, mitochondrial membrane potential, and vascular parameters in murine flank tumors using quantitative diffuse reflectance and fluorescence spectroscopy. BIOMEDICAL OPTICS EXPRESS 2018; 9:3399-3412. [PMID: 29984105 PMCID: PMC6033552 DOI: 10.1364/boe.9.003399] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 06/14/2018] [Accepted: 06/18/2018] [Indexed: 05/24/2023]
Abstract
The shifting metabolic landscape of aggressive tumors, with fluctuating oxygenation conditions and temporal changes in glycolysis and mitochondrial metabolism, is a critical phenomenon to study in order to understand negative treatment outcomes. Recently, we have demonstrated near-simultaneous optical imaging of mitochondrial membrane potential (MMP) and glucose uptake in non-tumor window chambers, using the fluorescent probes tetramethylrhodamine ethyl ester (TMRE) and 2-N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino)-2-deoxyglucose (2-NBDG). Here, we demonstrate a complementary technique to perform near-simultaneous in vivo optical spectroscopy of tissue vascular parameters, glucose uptake, and MMP in a solid tumor model that is most often used for therapeutic studies. Our study demonstrates the potential of optical spectroscopy as an effective tool to quantify the vascular and metabolic characteristics of a tumor, which is an important step towards understanding the mechanisms underlying cancer progression, metastasis, and resistance to therapies.
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Affiliation(s)
- Caigang Zhu
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Hannah L. Martin
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Brian T. Crouch
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Amy F. Martinez
- Currently with Office of Research, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Martin Li
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Gregory M. Palmer
- Department of Radiation Oncology, Duke University, Durham, NC 27710, USA
| | - Mark W. Dewhirst
- Department of Radiation Oncology, Duke University, Durham, NC 27710, USA
| | - Nimmi Ramanujam
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
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Levigoureux E, Bouillot C, Baron T, Zimmer L, Lancelot S. PET imaging of the influence of physiological and pathological α-synuclein on dopaminergic and serotonergic neurotransmission in mouse models. CNS Neurosci Ther 2018; 25:57-68. [PMID: 29781098 DOI: 10.1111/cns.12978] [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: 10/26/2017] [Revised: 04/24/2018] [Accepted: 04/25/2018] [Indexed: 12/22/2022] Open
Abstract
AIMS Alpha-synuclein (α-syn) aggregation is a neuropathological hallmark of neurodegenerative synucleinopathies. This in vivo study explored glucose metabolism and dopaminergic and serotoninergic neurotransmission in KO α-syn, wild-type mice and an accelerated murine model of synucleinopathy (M83). METHODS MicroPET acquisitions were performed in all animals aged 5-6 months using five radiotracers exploring brain glucose metabolism ([18 F]FDG), dopamine neurotransmission ([11 C]raclopride, [11 C]PE2I) and serotonin neurotransmission ([18 F]MPPF, [11 C]DASB). For all radiotracers, except [18 F]FDG, PET data were analyzed with a MRI-based VOI method and a voxel-based analysis. RESULTS MicroPET data showed a decrease in [11 C]raclopride uptake in the caudate putamen of KO α-syn mice, in comparison with M83 and WT mice, reflecting a lower concentration of D2 receptors. The increase in [18 F]MPPF uptake in M83 vs WT and KO mice indicates overexpression of 5-HT1A receptors. The lack of change in dopamine and serotonin transporters in all groups suggests unchanged neuronal density. CONCLUSIONS This PET study highlights an effect of α-syn modulation on the expression of the D2 receptor, whereas aggregated α-syn leads to overexpression of 5-HT1A receptor, as a pathophysiological signature.
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Affiliation(s)
- Elise Levigoureux
- Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, Université Claude Bernard Lyon 1, Université de Lyon, Lyon, France.,Hospices Civils de Lyon, Lyon, France
| | | | - Thierry Baron
- ANSES - French Agency for Food, Environmental and Occupational Health & Safety, Lyon, France
| | - Luc Zimmer
- Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, Université Claude Bernard Lyon 1, Université de Lyon, Lyon, France.,Hospices Civils de Lyon, Lyon, France.,CERMEP-Imaging Platform, Lyon, France
| | - Sophie Lancelot
- Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, Université Claude Bernard Lyon 1, Université de Lyon, Lyon, France.,Hospices Civils de Lyon, Lyon, France.,CERMEP-Imaging Platform, Lyon, France
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14
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Poussier S, Maskali F, Vexiau G, Verger A, Boutley H, Karcher G, Raffo E, Marie PY. Quantitative SPM Analysis Involving an Adaptive Template May Be Easily Applied to [ 18F]FDG PET Images of the Rat Brain. Mol Imaging Biol 2017; 19:731-735. [PMID: 28108871 DOI: 10.1007/s11307-016-1043-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE The Statistical Parametric Mapping (SPM) software is frequently used for the quantitative analysis of patients' brain images obtained from 2-deoxy-2-[18F]fluoro-D-glucose positron emission tomography ([18F]FDG PET). However, its adaptation to small animals is difficult, particularly for the initial step of spatial normalization which requires a specific brain anatomical template. This study was aimed at determining whether SPM analysis can be applied to rat, and more specifically to the lithium-pilocarpine model of epilepsy, by using an adaptive template. This template developed for PET clinical imaging is constructed from a block matching algorithm. PROCEDURES SPM analysis of brain [18F]FDG PET images from Sprague-Dawley rats was used with the block matching (BM) adaptive template for the detection of brain abnormalities (1) artificially inserted within the initially normal brain images of 10 rats (50 % decrease in signal intensity within 40 spheres of 0.5 to 1.0 mm in diameter) and (2) occurring at 4 h (n = 16), 48 h (n = 15), and 8 days (n = 13) after lithium-pilocarpine treatment. RESULTS Concordant positive clusters were documented for all inserted abnormalities, whereas no aberrant clusters were documented in remote brain areas. Positive clusters were also detected on sites known to be involved in the epileptogenesis process of the lithium-pilocarpine model (piriform and entorhinal cortex, hippocampus), with the expected time-specific changes involving an early hypermetabolism followed by a severe hypometabolism and a subsequent partial recovery. CONCLUSION A quantitative SPM analysis of brain [18F]FDG PET images may be applied to the monitoring of rat brain function when using an adaptive BM template.
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Affiliation(s)
- Sylvain Poussier
- NANCYCLOTEP-Experimental Imaging Platform, F-5400, Nancy, France.
- INSERM, IADI U947 and Lorraine University, F-5400, Nancy, France.
| | - Fatiha Maskali
- NANCYCLOTEP-Experimental Imaging Platform, F-5400, Nancy, France
- Department of Nuclear Medicine, University Hospital, F-5400, Nancy, France
| | - Gaelle Vexiau
- Department of Neurology, University Hospital, F-5400, Nancy, France
| | - Antoine Verger
- NANCYCLOTEP-Experimental Imaging Platform, F-5400, Nancy, France
- INSERM, IADI U947 and Lorraine University, F-5400, Nancy, France
- Department of Nuclear Medicine, University Hospital, F-5400, Nancy, France
| | - Henri Boutley
- NANCYCLOTEP-Experimental Imaging Platform, F-5400, Nancy, France
| | - Gilles Karcher
- NANCYCLOTEP-Experimental Imaging Platform, F-5400, Nancy, France
- Department of Nuclear Medicine, University Hospital, F-5400, Nancy, France
- INSERM U1116 and Lorraine University, F-5400, Nancy, France
| | - Emmanuel Raffo
- Department of Neurology, University Hospital, F-5400, Nancy, France
| | - Pierre-Yves Marie
- NANCYCLOTEP-Experimental Imaging Platform, F-5400, Nancy, France
- Department of Nuclear Medicine, University Hospital, F-5400, Nancy, France
- INSERM U1116 and Lorraine University, F-5400, Nancy, France
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15
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Stolin AV, Martone PF, Jaliparthi G, Raylman RR. Preclinical positron emission tomography scanner based on a monolithic annulus of scintillator: initial design study. J Med Imaging (Bellingham) 2017; 4:011007. [PMID: 28097210 DOI: 10.1117/1.jmi.4.1.011007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 12/06/2016] [Indexed: 02/02/2023] Open
Abstract
Positron emission tomography (PET) scanners designed for imaging of small animals have transformed translational research by reducing the necessity to invasively monitor physiology and disease progression. Virtually all of these scanners are based on the use of pixelated detector modules arranged in rings. This design, while generally successful, has some limitations. Specifically, use of discrete detector modules to construct PET scanners reduces detection sensitivity and can introduce artifacts in reconstructed images, requiring the use of correction methods. To address these challenges, and facilitate measurement of photon depth-of-interaction in the detector, we investigated a small animal PET scanner (called AnnPET) based on a monolithic annulus of scintillator. The scanner was created by placing 12 flat facets around the outer surface of the scintillator to accommodate placement of silicon photomultiplier arrays. Its performance characteristics were explored using Monte Carlo simulations and sections of the NEMA NU4-2008 protocol. Results from this study revealed that AnnPET's reconstructed spatial resolution is predicted to be [Formula: see text] full width at half maximum in the radial, tangential, and axial directions. Peak detection sensitivity is predicted to be 10.1%. Images of simulated phantoms (mini-hot rod and mouse whole body) yielded promising results, indicating the potential of this system for enhancing PET imaging of small animals.
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Affiliation(s)
- Alexander V Stolin
- West Virginia University , Center for Advanced Imaging, Department of Radiology, One Medical Center Dr., Box 9236, Morgantown, West Virginia 26506, United States
| | - Peter F Martone
- West Virginia University , Center for Advanced Imaging, Department of Radiology, One Medical Center Dr., Box 9236, Morgantown, West Virginia 26506, United States
| | - Gangadhar Jaliparthi
- West Virginia University , Center for Advanced Imaging, Department of Radiology, One Medical Center Dr., Box 9236, Morgantown, West Virginia 26506, United States
| | - Raymond R Raylman
- West Virginia University , Center for Advanced Imaging, Department of Radiology, One Medical Center Dr., Box 9236, Morgantown, West Virginia 26506, United States
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16
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Yang PF, Shang MC, Lin Q, Xiao H, Mei Z, Jia YZ, Liu W, Zhong ZH. Three-dimensional intracranial EEG monitoring in presurgical assessment of MRI-negative frontal lobe epilepsy. Medicine (Baltimore) 2016; 95:e5192. [PMID: 27977572 PMCID: PMC5268018 DOI: 10.1097/md.0000000000005192] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Magnetic resonance imaging (MRI)-negative epilepsy is associated with poor clinical outcomes prognosis. The present study was aimed to assess whether intracranial 3D interictal and ictal electroencephalography (EEG) findings, a combination of EEG at a different depth, in addition to clinical, scalp EEG, and positron emission tomography-computed tomography (PETCT) data help to predict outcome in a series of patients with MRI-negative frontal lobe epilepsy (FLE) after surgery.Patients with MRI-negative FLE who were presurgically evaluated by 3D-intracranial EEG (3D-iEEG) recording were included. Outcome predictors were compared in patients with seizure freedom (group 1) and those with recurrent seizures (group 2) at least 24 months after surgery.Forty-seven patients (15 female) were included in this study. MRI was found normal in 38 patients, whereas a focal or regional hypometabolism was observed in 33 cases. Twenty-three patients (48.9%) were seizure-free (Engel class I), and 24 patients (51.1%) continued to have seizures (12 were class II, 7 were class III, and 5 were class IV). Detailed analysis of intracranial EEG revealed widespread (>2 cm) (17.4%:75%; P = 0.01) in contrast to focal seizure onset as well as shorter latency to onset of seizure spread (5.9 ± 7.1 s; 1.4 ± 2.9 s; P = 0.016) and to ictal involvement of brain structures beyond the frontal lobe (21.8 ± 20.3 s; 4.9 ± 5.1 s; P = 0.025) in patients without seizure freedom.The results suggest that presurgical evaluation using 3D-iEEG monitoring lead to a better surgical outcome as seizure free in MRI-negative FLE patients.
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Affiliation(s)
| | | | | | | | | | | | - Wei Liu
- Department of Pathology, Fuzhou General Hospital , Xiamen University Medical College, Fuzhou, China
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17
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Deleye S, Waldron AM, Richardson JC, Schmidt M, Langlois X, Stroobants S, Staelens S. The Effects of Physiological and Methodological Determinants on 18F-FDG Mouse Brain Imaging Exemplified in a Double Transgenic Alzheimer Model. Mol Imaging 2016; 15:15/0/1536012115624919. [PMID: 27030402 PMCID: PMC5470082 DOI: 10.1177/1536012115624919] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 12/04/2015] [Indexed: 12/22/2022] Open
Abstract
Introduction: In this study, the influence of physiological determinants on 18F-fluoro-d-glucose (18F-FDG) brain uptake was evaluated in a mouse model of Alzheimer disease. Materials and Methods: TASTPM (Tg) and age-matched C57BL/6 J (WT) mice were fasted for 10 hours, while another group was fasted for 20 hours to evaluate the effect of fasting duration. The effect of repeatedly scanning was evaluated by scanning Tg and WT mice at days 1, 4, and 7. Brain 18F-FDG uptake was evaluated in the thalamus being the most indicative region. Finally, the cerebellum was tested as a reference region for the relative standard uptake value (rSUV). Results: When correcting the brain uptake for glucose, the effect of different fasting durations was attenuated and the anticipated hypometabolism in Tg mice was demonstrated. Also, with repeated scanning, the brain uptake values within a group and the hypometabolism of the Tg mice only remained stable over time when glucose correction was applied. Finally, hypometabolism was also observed in the cerebellum, yielding artificially higher rSUV values for Tg mice. Conclusion: Corrections for blood glucose levels have to be applied when semiquantifying 18F-FDG brain uptake in mouse models for AD. Potential reference regions for normalization should be thoroughly investigated to ensure that they are not pathologically affected also by afferent connections.
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Affiliation(s)
- Steven Deleye
- Molecular Imaging Center Antwerp, University of Antwerp, Antwerp, Belgium
| | - Ann-Marie Waldron
- Molecular Imaging Center Antwerp, University of Antwerp, Antwerp, Belgium
| | | | - Mark Schmidt
- Neuroscience Department, Janssen Pharmaceutica NV, Beerse, Belgium
| | - Xavier Langlois
- Neuroscience Department, Janssen Pharmaceutica NV, Beerse, Belgium
| | - Sigrid Stroobants
- Molecular Imaging Center Antwerp, University of Antwerp, Antwerp, Belgium Nuclear Medicine Department, University Hospital Antwerp, Antwerp, Belgium
| | - Steven Staelens
- Molecular Imaging Center Antwerp, University of Antwerp, Antwerp, Belgium
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Raylman RR, Stolin AV, Martone PF, Smith MF. TandemPET- A High Resolution, Small Animal, Virtual Pinhole-Based PET Scanner: Initial Design Study. IEEE TRANSACTIONS ON NUCLEAR SCIENCE 2016; 63:75-83. [PMID: 27041767 PMCID: PMC4813808 DOI: 10.1109/tns.2015.2482459] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Mice are the perhaps the most common species of rodents used in biomedical research, but many of the current generation of small animal PET scanners are non-optimal for imaging these small rodents due to their relatively low resolution. Consequently, a number of researchers have investigated the development of high-resolution scanners to address this need. In this investigation, the design of a novel, high-resolution system based on the dual-detector, virtual-pinhole PET concept was explored via Monte Carlo simulations. Specifically, this system, called TandemPET, consists of a 5 cm × 5 cm high-resolution detector made-up of a 90 × 90 array of 0.5 mm × 0.5 mm × 10 mm (pitch= 0.55 mm) LYSO detector elements in coincidence with a lower resolution detector consisting of a 68 × 68 array of 1.5 mm × 1.5 mm × 10 mm LYSO detector elements (total size= 10.5 cm × 10.5 cm). Analyses indicated that TandemPET's optimal geometry is to position the high-resolution detector 3 cm from the center-of-rotation, with the lower resolution detector positioned 9 cm from center. Measurements using modified NEMA NU4-2008-based protocols revealed that the spatial resolution of the system is ~0.5 mm FWHM, after correction of positron range effects. Peak sensitivity is 2.1%, which is comparable to current small animal PET scanners. Images from a digital mouse brain phantom demonstrated the potential of the system for identifying important neurological structures.
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Affiliation(s)
- Raymond R. Raylman
- Center for Advanced Imaging, Department of Radiology at West Virginia University
| | - Alexander V. Stolin
- Center for Advanced Imaging, Department of Radiology at West Virginia University
| | - Peter F. Martone
- Center for Advanced Imaging, Department of Radiology at West Virginia University
| | - Mark F. Smith
- Department of Diagnostic Radiology and Nuclear Medicine at the University of Maryland School of Medicine
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Waldron AM, Wintmolders C, Bottelbergs A, Kelley JB, Schmidt ME, Stroobants S, Langlois X, Staelens S. In vivo molecular neuroimaging of glucose utilization and its association with fibrillar amyloid-β load in aged APPPS1-21 mice. ALZHEIMERS RESEARCH & THERAPY 2015; 7:76. [PMID: 26666747 PMCID: PMC4678474 DOI: 10.1186/s13195-015-0158-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 10/21/2015] [Indexed: 11/10/2022]
Abstract
Introduction Radioligand imaging is a powerful in vivo method to assess the molecular basis of Alzheimer’s Disease. We therefore aimed to visualize the pathological deposition of fibrillar amyloid-β and neuronal dysfunction in aged double transgenic mice. Methods Using non-invasive positron emission tomography (PET) we assessed brain glucose utilization with [18F]FDG and fibrillar amyloidosis with [11C]PiB and [18F]AV45 in 12 month old APPPS1-21 (n = 10) mice and their age-matched wild-type controls (n = 15). PET scans were analyzed with statistical parametric mapping (SPM) to detect significant differences in tracer uptake between genotypes. After imaging, mice were sacrificed and ex vivo measures of amyloid-β burden with immunohistochemistry as well as glucose utilization with [14C]-2DG autoradiography were obtained as gold standards. Results Voxel-wise SPM analysis revealed significantly decreased [18F]FDG uptake in aged APPPS1-21 mice in comparison to WT with the thalamus (96.96 %, maxT = 3.35) and striatum (61.21 %, maxT = 3.29) demonstrating the most widespread reductions at the threshold of p < 0.01. [11C]PiB binding was significantly increased in APPPS1-21 mice, most notably in the hippocampus (87.84 %, maxT = 7.15) and cortex (69.08 %, maxT = 7.95), as detected by SPM voxel-wise analysis at the threshold of p < 0.01. Using the same threshold [18F]AV45 uptake was comparably lower with less significant differences. Compared to their respective ex vivo equivalents [18F]FDG demonstrated significant positive correlation to [14C]2-DG autoradiography (r = 0.67, p <0.0001) while [11C]PiB and [18F]AV45 binding did not correlate to ex vivo immunohistochemistry for amyloid-β (r = 0.25, p = 0.07 and r = 0.17, p = 0.26 respectively). Lastly no correlation was observed between regions of high amyloid burden and those with decreased glucose utilization (r = 0.001, p = 0.99). Conclusions Our findings support that fibrillar amyloid-β deposition and reduced glucose utilization can be visualized and quantified with in vivo μPET imaging in aged APPPS1-21 mice. Therefore, the combined use of [18F]FDG and amyloid μPET imaging can shed light on the underlying relationship between fibrillar amyloid-β pathology and neuronal dysfunction.
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Affiliation(s)
- Ann-Marie Waldron
- Molecular Imaging Center Antwerp, University of Antwerp, Campus Drie Eiken - UC, Universiteitsplein 1, 2610, Wilrijk, Antwerp, Belgium.
| | - Cindy Wintmolders
- Neuroscience Research & Development, Janssen Pharmaceutica NV, Beerse, Belgium.
| | - Astrid Bottelbergs
- Neuroscience Research & Development, Janssen Pharmaceutica NV, Beerse, Belgium.
| | - Jonathan B Kelley
- Neuroscience Research & Development, Janssen Pharmaceutica NV, Beerse, Belgium.
| | - Mark E Schmidt
- Neuroscience Research & Development, Janssen Pharmaceutica NV, Beerse, Belgium.
| | - Sigrid Stroobants
- Molecular Imaging Center Antwerp, University of Antwerp, Campus Drie Eiken - UC, Universiteitsplein 1, 2610, Wilrijk, Antwerp, Belgium. .,Nuclear Medicine Department, University Hospital Antwerp, Antwerp, Belgium.
| | - Xavier Langlois
- Neuroscience Research & Development, Janssen Pharmaceutica NV, Beerse, Belgium.
| | - Steven Staelens
- Molecular Imaging Center Antwerp, University of Antwerp, Campus Drie Eiken - UC, Universiteitsplein 1, 2610, Wilrijk, Antwerp, Belgium.
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Li K, Safavi-Naeini M, Franklin DR, Han Z, Rosenfeld AB, Hutton B, Lerch MLF. A new virtual ring-based system matrix generator for iterative image reconstruction in high resolution small volume PET systems. Phys Med Biol 2015; 60:6949-73. [DOI: 10.1088/0031-9155/60/17/6949] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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