Article (Scientific journals)
Dopaminergic deficits along the spectrum of Alzheimer's disease.
Pilotto, Andrea; Galli, Alice; Sala, Arianna et al.
2025In Molecular Psychiatry, 30 (7), p. 3069 - 3076
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Keywords :
Dopamine; Dopamine Plasma Membrane Transport Proteins; Tropanes; 2-carbomethoxy-8-(3-fluoropropyl)-3-(4-iodophenyl)tropane; Humans; Male; Female; Aged; Brain/metabolism; Brain/diagnostic imaging; Tomography, Emission-Computed, Single-Photon/methods; Dopamine Plasma Membrane Transport Proteins/metabolism; Aged, 80 and over; Cognitive Dysfunction/metabolism; Middle Aged; Neural Pathways/metabolism; Alzheimer Disease/metabolism; Alzheimer Disease/diagnostic imaging; Dopamine/metabolism; Alzheimer Disease; Brain; Cognitive Dysfunction; Neural Pathways; Tomography, Emission-Computed, Single-Photon; Molecular Biology; Cellular and Molecular Neuroscience; Psychiatry and Mental Health
Abstract :
[en] Both post-mortem and in vivo data argue for dopamine dysfunction in patients with Alzheimer's Disease (AD). However, the timing and regional progression of dopaminergic systems alterations in AD are still debated. The aim of the study was to investigate in vivo the pattern of dopaminergic changes and connectivity using DAT-SPECT imaging in patients across the AD spectrum. Fifty-nine AD patients (n = 21 AD-MCI; n = 38 AD-DEM) and a control group (CG) of n = 45 age- and sex-matched individuals entered the study and underwent 123I-FP-CIT dopaminergic imaging. The occipital binding was used as reference region to obtain single-subject binding in different brain regions. Between-group differences in 123I-FP-CIT binding in both mesolimbic and nigrostriatal dopaminergic pathways were assessed using an ANCOVA test, adjusting for the effect of center of imaging acquisition, age, and sex. Regions resulting from the voxel-wise direct comparison between AD-MCI and AD-DEM were considered as a seed of interest for a voxel-wise interregional correlation analysis. Both AD-MCI and AD-DEM patients showed dopaminergic depletion within the basal ganglia, whereas cortico-limbic regions (namely hippocampus, amygdala, anterior and middle cingulate, frontal cortex and thalamus) resulted impaired only in the dementia phase. The brain voxel-wise interregional correlation analysis showed a progressive pattern of disruption of caudate/thalamus dopaminergic connectivity to hippocampus and amygdala from AD-MCI to AD-DEM stages. This study indicates basal ganglia dopaminergic alterations and connectivity disruption in the nigrostriatal and mesolimbic systems already in early stage AD, extending to several cortico-limbic regions in dementia phases.
Disciplines :
Neurology
Author, co-author :
Pilotto, Andrea ;  Department of Clinical and Experimental Sciences, Neurology Unit, University of Brescia, Brescia, Italy. pilottoandreae@gmail.com ; Laboratory of Digital Neurology and Biosensors, University of Brescia, Brescia, Italy. pilottoandreae@gmail.com ; Neurology Unit, Department of continuity of care and frailty, ASST Spedali Civili Brescia Hospital, Brescia, Italy. pilottoandreae@gmail.com ; Neurobiorepository and Laboratory of advanced biological markers, University of Brescia and ASST Spedali Civili Hospital, Brescia, Italy. pilottoandreae@gmail.com
Galli, Alice;  Department of Clinical and Experimental Sciences, Neurology Unit, University of Brescia, Brescia, Italy ; Laboratory of Digital Neurology and Biosensors, University of Brescia, Brescia, Italy
Sala, Arianna  ;  Université de Liège - ULiège > Département des sciences cliniques
Caminiti, Silvia Paola;  Department of Brain and Behavioral Sciences- Univeristy of Pavia, Pavia, Italy
Presotto, Luca;  Department of Physics "G. Occhialini", University of Milano-Bicocca, Milan, Italy
Liguori, Claudio;  Neurophysiology Unit, Sleep and Epilepsy Center- University of Rome Tor Vergata, Rome, Italy
Mercuri, Nicola Biagio ;  Neurophysiology Unit, Sleep and Epilepsy Center- University of Rome Tor Vergata, Rome, Italy
Premi, Enrico ;  Stroke Unit, ASST Spedali Civili Brescia Hospital, Brescia, Italy
Garibotto, Valentina ;  Department of Radiology and Medical Informatics- Geneva University Hospital, Geneva, Switzerland
Frisoni, Giovanni;  Department of Psychiatry- Geneva University Hospital, Geneva, Switzerland
Chiaravalloti, Agostino;  Department of Biomedicine and Prevention, University of Rome "Tor Vergata", Rome, Italy
Schillaci, Orazio;  Department of Biomedicine and Prevention, University of Rome "Tor Vergata", Rome, Italy
D'Amelio, Marcello ;  Department of Experimental Neurosciences, IRCCS Santa Lucia Foundation, Rome, Italy ; Department of Medicine and Surgery, Università Campus Bio-Medico di Roma, Rome, Italy
Paghera, Barbara;  Nuclear Medicine Unit- University of Brescia, Brescia, Italy
Lucchini, Silvia;  Nuclear Medicine Unit- University of Brescia, Brescia, Italy
Bertagna, Francesco;  Nuclear Medicine Unit- University of Brescia, Brescia, Italy
Perani, Daniela;  University Vita-Salute San Raffaele, IRCCS San Raffaele Hospital, Milan, Italy
Padovani, Alessandro ;  Department of Clinical and Experimental Sciences, Neurology Unit, University of Brescia, Brescia, Italy ; Laboratory of Digital Neurology and Biosensors, University of Brescia, Brescia, Italy ; Neurology Unit, Department of continuity of care and frailty, ASST Spedali Civili Brescia Hospital, Brescia, Italy ; Brain Health Center, University of Brescia, Brescia, Italy
More authors (8 more) Less
Language :
English
Title :
Dopaminergic deficits along the spectrum of Alzheimer's disease.
Publication date :
July 2025
Journal title :
Molecular Psychiatry
ISSN :
1359-4184
eISSN :
1476-5578
Publisher :
Springer, England
Volume :
30
Issue :
7
Pages :
3069 - 3076
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Ministero della Salute
MIUR - Ministero dell'Istruzione, dell'Università e della Ricerca
Funding text :
We thank the participants in this study for their time and willingness to contribute this research. The study was partially supported by the Italian Ministry of Health with the grant RF-2018-12366209 and by #NEXTGENERATIONEU (NGEU) funded by the Ministry of University and Research (MIUR), National Recovery and Resilience Plan (NRRP), project MNESYS (PE0000006) \u2013 a multiscale integrated approach to the study of the nervous system in health and disease (DN. 1553 11.10.2022) to Silvia Paola Caminiti, Nicola Biagio Mercuri and Claudio Liguori; by the American Alzheimer\u2019s Association (AARG-21-851219) and by Fondazione Roma (Rome, Italy) to Marcello D\u2019Amelio.
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since 27 October 2025

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