1
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Papenberg G, Karalija N, Johansson J, Andersson M, Axelsson J, Riklund K, Lindenberger U, Nyberg L, Bäckman L. The influence of hippocampal dopamine D2 receptor losses on episodic-memory decline across 5 years is moderated by BDNF and KIBRA polymorphisms. Cortex 2024; 176:53-61. [PMID: 38749085 DOI: 10.1016/j.cortex.2024.01.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 12/01/2023] [Accepted: 01/16/2024] [Indexed: 06/11/2024]
Abstract
Losses in dopamine (DA) functioning may contribute to aging-related decline in cognition. Hippocampal DA is necessary for successful episodic memory formation. Previously, we reported that higher DA D2 receptor (D2DR) availability in hippocampus is beneficial for episodic memory only in older carriers of more advantageous genotypes of well-established plasticity-related genetic variations, the brain-derived neurotrophic factor (BDNF, rs6265) and the kidney and brain expressed protein (KIBRA, rs17070145) polymorphisms. Extending our observations to the longitudinal level, the current data show that individuals with one or no beneficial BDNF and KIBRA genotype (n = 80) decline more in episodic memory across five years, without any contribution of losses in hippocampal D2DR availability to memory decline. Although carriers of two beneficial genotypes (n = 39) did not decline overall in episodic memory, losses of hippocampal D2DR availability were predictive of episodic-memory decline among these individuals. Our findings have implications for interventions targeting DA modulation to enhance episodic memory in aging, which may not benefit all older individuals.
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Affiliation(s)
- Goran Papenberg
- Aging Research Center, Karolinska Institutet and Stockholm University, Stockholm, Sweden.
| | - Nina Karalija
- Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden; Department of Medical and Translational Biology, Umeå University, Umeå, Sweden
| | - Jarkko Johansson
- Department of Diagnostics and Intervention, Umeå University, Umeå, Sweden; Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden
| | - Micael Andersson
- Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden; Department of Medical and Translational Biology, Umeå University, Umeå, Sweden
| | - Jan Axelsson
- Department of Diagnostics and Intervention, Umeå University, Umeå, Sweden; Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden
| | - Katrine Riklund
- Department of Diagnostics and Intervention, Umeå University, Umeå, Sweden; Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden
| | - Ulman Lindenberger
- Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany; Max Planck UCL Centre for Computational Psychiatry and Ageing Research, Berlin, Germany
| | - Lars Nyberg
- Department of Diagnostics and Intervention, Umeå University, Umeå, Sweden; Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden; Department of Medical and Translational Biology, Umeå University, Umeå, Sweden
| | - Lars Bäckman
- Aging Research Center, Karolinska Institutet and Stockholm University, Stockholm, Sweden
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2
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Karalija N, Papenberg G, Johansson J, Wåhlin A, Salami A, Andersson M, Axelsson J, Kuznetsov D, Riklund K, Lövdén M, Lindenberger U, Bäckman L, Nyberg L. Longitudinal support for the correlative triad among aging, dopamine D2-like receptor loss, and memory decline. Neurobiol Aging 2024; 136:125-132. [PMID: 38359585 DOI: 10.1016/j.neurobiolaging.2024.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 01/25/2024] [Accepted: 02/01/2024] [Indexed: 02/17/2024]
Abstract
Dopamine decline is suggested to underlie aging-related cognitive decline, but longitudinal examinations of this link are currently missing. We analyzed 5-year longitudinal data for a sample of healthy, older adults (baseline: n = 181, age: 64-68 years; 5-year follow-up: n = 129) who underwent positron emission tomography with 11C-raclopride to assess dopamine D2-like receptor (DRD2) availability, magnetic resonance imaging to evaluate structural brain measures, and cognitive tests. Health, lifestyle, and genetic data were also collected. A data-driven approach (k-means cluster analysis) identified groups that differed maximally in DRD2 decline rates in age-sensitive brain regions. One group (n = 47) had DRD2 decline exclusively in the caudate and no cognitive decline. A second group (n = 72) had more wide-ranged DRD2 decline in putamen and nucleus accumbens and also in extrastriatal regions. The latter group showed significant 5-year working memory decline that correlated with putamen DRD2 decline, along with higher dementia and cardiovascular risk and a faster biological pace of aging. Taken together, for individuals with more extensive DRD2 decline, dopamine decline is associated with memory decline in aging.
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Affiliation(s)
- Nina Karalija
- Department of Medical and Translational Biology, Umeå University, Umeå S-90187, Sweden; Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå S-90187, Sweden.
| | - Goran Papenberg
- Aging Research Center, Karolinska Institutet & Stockholm University, Stockholm S-17165, Sweden
| | - Jarkko Johansson
- Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå S-90187, Sweden; Department of Diagnostics and Intervention, Diagnostic Radiology, Umeå University, Umeå S-90187, Sweden
| | - Anders Wåhlin
- Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå S-90187, Sweden; Department of Diagnostics and Intervention, Radiation Physics, Umeå University, Umeå S-90187, Sweden; Department of Applied Physics and Electronics, Umeå University, Umeå S-90187, Sweden
| | - Alireza Salami
- Department of Medical and Translational Biology, Umeå University, Umeå S-90187, Sweden; Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå S-90187, Sweden; Aging Research Center, Karolinska Institutet & Stockholm University, Stockholm S-17165, Sweden; Wallenberg Center for Molecular Medicine, Umeå University, Umeå, Sweden
| | - Micael Andersson
- Department of Medical and Translational Biology, Umeå University, Umeå S-90187, Sweden; Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå S-90187, Sweden
| | - Jan Axelsson
- Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå S-90187, Sweden; Department of Diagnostics and Intervention, Radiation Physics, Umeå University, Umeå S-90187, Sweden
| | - Dmitry Kuznetsov
- Faculty of Sociology, University of Bielefeld, Bielefeld, Germany
| | - Katrine Riklund
- Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå S-90187, Sweden; Department of Diagnostics and Intervention, Diagnostic Radiology, Umeå University, Umeå S-90187, Sweden
| | - Martin Lövdén
- Department of Psychology, University of Gothenburg, Göteborg S-41314, Sweden
| | - Ulman Lindenberger
- Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin D-14195, Germany; Max Planck UCL Centre for Computational Psychiatry and Ageing Research, Berlin, Germany; Max Planck UCL Centre for Computational Psychiatry and Ageing Research, London, UK
| | - Lars Bäckman
- Aging Research Center, Karolinska Institutet & Stockholm University, Stockholm S-17165, Sweden
| | - Lars Nyberg
- Department of Medical and Translational Biology, Umeå University, Umeå S-90187, Sweden; Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå S-90187, Sweden; Department of Diagnostics and Intervention, Diagnostic Radiology, Umeå University, Umeå S-90187, Sweden
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3
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von Cederwald BF, Johansson J, Riklund K, Karalija N, Boraxbekk CJ. White matter lesion load determines exercise-induced dopaminergic plasticity and working memory gains in aging. Transl Psychiatry 2023; 13:28. [PMID: 36720847 PMCID: PMC9889313 DOI: 10.1038/s41398-022-02270-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 11/02/2022] [Accepted: 11/28/2022] [Indexed: 02/01/2023] Open
Abstract
Age-related dopamine reductions have been suggested to contribute to maladaptive working memory (WM) function in older ages. One promising intervention approach is to increase physical activity, as this has been associated with plasticity of the striatal dopamine system and WM improvements, however with individual differences in efficacy. The present work focused on the impact of individual differences in white-matter lesion burden upon dopamine D2-like receptor (DRD2) availability and WM changes in response to a 6 months physical activity intervention. While the intervention altered striatal DRD2 availability and WM performance in individuals with no or only mild lesions (p < 0.05), no such effects were found in individuals with moderate-to-severe lesion severity (p > 0.05). Follow-up analyses revealed a similar pattern for processing speed, but not for episodic memory performance. Linear analyses further revealed that lesion volume (ml) at baseline was associated with reduced DRD2 availability (r = -0.41, p < 0.05), and level of DRD2 change (r = 0.40, p < 0.05). Taken together, this study underlines the necessity to consider cerebrovascular health in interventions with neurocognitive targets. Future work should assess whether these findings extend beyond measures of DRD2 availability and WM.
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Affiliation(s)
- Bryn Farnsworth von Cederwald
- grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
| | - Jarkko Johansson
- grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden
| | - Katrine Riklund
- grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden
| | - Nina Karalija
- Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden. .,Department of Integrative Medical Biology, Umeå University, Umeå, Sweden.
| | - Carl-Johan Boraxbekk
- Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden. .,Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden. .,Danish Research Center for Magnetic Resonance (DRCMR), Center for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital, Amager and Hvidovre, Copenhagen, Denmark. .,Institute of Sports Medicine Copenhagen (ISMC) and Department of Neurology, Copenhagen University Hospital Bispebjerg, Copenhagen, Denmark. .,Institute for Clinical Medicine, Faculty of Medical and Health Sciences, University of Copenhagen, Copenhagen, Denmark.
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4
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Karalija N, Köhncke Y, Düzel S, Bertram L, Papenberg G, Demuth I, Lill CM, Johansson J, Riklund K, Lövdén M, Bäckman L, Nyberg L, Lindenberger U, Brandmaier AM. A common polymorphism in the dopamine transporter gene predicts working memory performance and in vivo dopamine integrity in aging. Neuroimage 2021; 245:118707. [PMID: 34742942 DOI: 10.1016/j.neuroimage.2021.118707] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 10/04/2021] [Accepted: 11/01/2021] [Indexed: 11/17/2022] Open
Abstract
Dopamine (DA) integrity is suggested as a potential cause of individual differences in working memory (WM) performance among older adults. Still, the principal dopaminergic mechanisms giving rise to WM differences remain unspecified. Here, 61 single-nucleotide polymorphisms, located in or adjacent to various dopamine-related genes, were assessed for their links to WM performance in a sample of 1313 adults aged 61-80 years from the Berlin Aging Study II. Least Absolute Shrinkage and Selection Operator (LASSO) regression was conducted to estimate associations between polymorphisms and WM. Rs40184 in the DA transporter gene, SLC6A3, showed allelic group differences in WM, with T-carriers performing better than C homozygotes (p<0.01). This finding was replicated in an independent sample from the Cognition, Brain, and Aging study (COBRA; baseline: n = 181, ages: 64-68 years; 5-year follow up: n = 129). In COBRA, in vivo DA integrity was measured with 11C-raclopride and positron emission tomography. Notably, WM as well as in vivo DA integrity was higher for rs40184 T-carriers at baseline (p<0.05 for WM and caudate and hippocampal D2-receptor availability) and at the 5-year follow-up (p<0.05 for WM and hippocampal D2 availability). Our findings indicate that individual differences in DA transporter function contribute to differences in WM performance in old age, presumably by regulating DA availability.
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Affiliation(s)
- Nina Karalija
- Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany; Umeå center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden; Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden.
| | - Ylva Köhncke
- Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany
| | - Sandra Düzel
- Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany
| | - Lars Bertram
- Lübeck Interdisciplinary Platform for Genome Analytics, University of Lübeck, Lübeck, Germany; Center for Lifespan Changes in Brain and Cognition, Department of Psychology, University of Oslo, Oslo, Norway
| | - Goran Papenberg
- Aging Research Center, Karolinska Institutet & Stockholm University, Solna, Sweden
| | - Ilja Demuth
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Endocrinology and Metabolism, Berlin, Germany; Charité - Universitätsmedizin Berlin, BCRT - Berlin Institute of Health Center for Regenerative Therapies, Berlin, Germany
| | - Christina M Lill
- Lübeck Interdisciplinary Platform for Genome Analytics, University of Lübeck, Lübeck, Germany; Ageing Epidemiology Research Unit, School of Public Health, Imperial College London, London, UK
| | - Jarkko Johansson
- Umeå center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden; Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden
| | - Katrine Riklund
- Umeå center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden; Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden
| | - Martin Lövdén
- Department of psychology, University of Gothenburg, Gothenburg, Sweden
| | - Lars Bäckman
- Aging Research Center, Karolinska Institutet & Stockholm University, Solna, Sweden
| | - Lars Nyberg
- Umeå center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden; Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden; Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
| | - Ulman Lindenberger
- Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany; Max Planck UCL Centre for Computational Psychiatry and Ageing Research, Berlin, Germany, and London, UK
| | - Andreas M Brandmaier
- Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany; Max Planck UCL Centre for Computational Psychiatry and Ageing Research, Berlin, Germany, and London, UK
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5
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Korkki SM, Papenberg G, Karalija N, Garrett DD, Riklund K, Lövdén M, Lindenberger U, Nyberg L, Bäckman L. Fronto-striatal dopamine D2 receptor availability is associated with cognitive variability in older individuals with low dopamine integrity. Sci Rep 2021; 11:21089. [PMID: 34702857 PMCID: PMC8548594 DOI: 10.1038/s41598-021-00106-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 09/30/2021] [Indexed: 11/09/2022] Open
Abstract
Within-person, moment-to-moment, variability in behavior increases with advancing adult age, potentially reflecting the influence of reduced structural and neurochemical brain integrity, especially that of the dopaminergic system. We examined the role of dopamine D2 receptor (D2DR) availability, grey-, and white-matter integrity, for between-person differences in cognitive variability in a large sample of healthy older adults (n = 181; 64-68 years) from the Cognition, Brain, and Aging (COBRA) study. Intra-individual variability (IIV) in cognition was measured as across-trial variability in participants' response times for tasks assessing perceptual speed and working memory, as well as for a control task of motor speed. Across the whole sample, no associations of D2DR availability, or grey- and white-matter integrity, to IIV were observed. However, within-person variability in cognition was increased in two subgroups of individuals displaying low mean-level cognitive performance, one of which was characterized by low subcortical and cortical D2DR availability. In this latter group, fronto-striatal D2DR availability correlated negatively with within-person variability in cognition. This finding suggests that the influence of D2DR availability on cognitive variability may be more easily disclosed among individuals with low dopamine-system integrity, highlighting the benefits of large-scale studies for delineating heterogeneity in brain-behavior associations in older age.
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Affiliation(s)
- Saana M. Korkki
- grid.10548.380000 0004 1936 9377Aging Research Center, Karolinska Institute and Stockholm University, Stockholm, Sweden
| | - Goran Papenberg
- grid.10548.380000 0004 1936 9377Aging Research Center, Karolinska Institute and Stockholm University, Stockholm, Sweden
| | - Nina Karalija
- grid.12650.300000 0001 1034 3451Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden
| | - Douglas D. Garrett
- grid.419526.d0000 0000 9859 7917Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany ,grid.4372.20000 0001 2105 1091Max Planck UCL Centre for Computational Psychiatry and Ageing Research, Berlin, Germany
| | - Katrine Riklund
- grid.12650.300000 0001 1034 3451Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden
| | - Martin Lövdén
- grid.8761.80000 0000 9919 9582Department of Psychology, University of Gothenburg, Gothenburg, Sweden
| | - Ulman Lindenberger
- grid.419526.d0000 0000 9859 7917Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany ,grid.4372.20000 0001 2105 1091Max Planck UCL Centre for Computational Psychiatry and Ageing Research, Berlin, Germany
| | - Lars Nyberg
- grid.12650.300000 0001 1034 3451Department of Radiation Sciences, Diagnostic Radiology, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden ,grid.12650.300000 0001 1034 3451Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
| | - Lars Bäckman
- grid.10548.380000 0004 1936 9377Aging Research Center, Karolinska Institute and Stockholm University, Stockholm, Sweden
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6
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Papenberg G, Karalija N, Salami A, Rieckmann A, Andersson M, Axelsson J, Riklund K, Lindenberger U, Lövdén M, Nyberg L, Bäckman L. Balance between Transmitter Availability and Dopamine D2 Receptors in Prefrontal Cortex Influences Memory Functioning. Cereb Cortex 2021; 30:989-1000. [PMID: 31504282 DOI: 10.1093/cercor/bhz142] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 06/04/2019] [Accepted: 06/04/2019] [Indexed: 12/11/2022] Open
Abstract
Insufficient or excessive dopaminergic tone impairs cognitive performance. We examine whether the balance between transmitter availability and dopamine (DA) D2 receptors (D2DRs) is important for successful memory performance in a large sample of adults (n = 175, 64-68 years). The Catechol-O-Methyltransferase polymorphism served as genetic proxy for endogenous prefrontal DA availability, and D2DRs in dorsolateral prefrontal cortex (dlPFC) were measured with [11C]raclopride-PET. Individuals for whom D2DR status matched DA availability showed higher levels of episodic and working-memory performance than individuals with insufficient or excessive DA availability relative to the number of receptors. A similar pattern restricted to episodic memory was observed for D2DRs in caudate. Functional magnetic resonance imaging data acquired during working-memory performance confirmed the importance of a balanced DA system for load-dependent brain activity in dlPFC. Our data suggest that the inverted-U-shaped function relating DA signaling to cognition is modulated by a dynamic association between DA availability and receptor status.
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Affiliation(s)
- Goran Papenberg
- Aging Research Center, Karolinska Institute and Stockholm University, S-17177 Stockholm, Sweden
| | - Nina Karalija
- Department of Radiation Sciences, Umeå University, S-90187 Umeå, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, S-90187 Umeå, Sweden
| | - Alireza Salami
- Aging Research Center, Karolinska Institute and Stockholm University, S-17177 Stockholm, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, S-90187 Umeå, Sweden.,Wallenberg Centre for Molecular Medicine, Umeå University, S-90187 Umeå, Sweden
| | - Anna Rieckmann
- Umeå Center for Functional Brain Imaging (UFBI), Umeå University, S-90187 Umeå, Sweden
| | - Micael Andersson
- Department of Radiation Sciences, Umeå University, S-90187 Umeå, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, S-90187 Umeå, Sweden
| | - Jan Axelsson
- Department of Radiation Sciences, Umeå University, S-90187 Umeå, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, S-90187 Umeå, Sweden
| | - Katrine Riklund
- Department of Radiation Sciences, Umeå University, S-90187 Umeå, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, S-90187 Umeå, Sweden
| | - Ulman Lindenberger
- Center for Lifespan Psychology, Max Planck Institute for Human Development, D-14195 Berlin, Germany.,Max Planck UCL Centre for Computational Psychiatry and Ageing Research, D-14195 Berlin, Germany and UK-WC1B 5EH London, UK
| | - Martin Lövdén
- Aging Research Center, Karolinska Institute and Stockholm University, S-17177 Stockholm, Sweden
| | - Lars Nyberg
- Department of Radiation Sciences, Umeå University, S-90187 Umeå, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, S-90187 Umeå, Sweden.,Department of Integrative Medical Biology, Umeå University, S-90187 Umeå, Sweden
| | - Lars Bäckman
- Aging Research Center, Karolinska Institute and Stockholm University, S-17177 Stockholm, Sweden
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7
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Karalija N, Jonassson L, Johansson J, Papenberg G, Salami A, Andersson M, Riklund K, Nyberg L, Boraxbekk CJ. High long-term test-retest reliability for extrastriatal 11C-raclopride binding in healthy older adults. J Cereb Blood Flow Metab 2020; 40:1859-1868. [PMID: 31506011 PMCID: PMC7446562 DOI: 10.1177/0271678x19874770] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In vivo dopamine D2-receptor availability is frequently assessed with 11C-raclopride and positron emission tomography. Due to low signal-to-noise ratios for 11C-raclopride in areas with low D2 receptor densities, the ligand has been considered unreliable for measurements outside the dopamine-dense striatum. Intriguingly, recent studies show that extrastriatal 11C-raclopride binding potential (BPND) values are (i) reliably higher than in the cerebellum (where D2-receptor levels are negligible), (ii) correlate with behavior in the expected direction, and (iii) showed good test-retest reliability in a sample of younger adults. The present work demonstrates high seven-month test-retest reliability of striatal and extrastriatal 11C-raclopride BPND values in healthy, older adults (n = 27, age: 64-78 years). Mean 11C-raclopride BPND values were stable between test sessions in subcortical nuclei, and in frontal and temporal cortices (p > 0.05). Across all structures analyzed, intraclass correlation coefficients were high (0.85-0.96), absolute variability was low (mean: 4-8%), and coefficients of variance ranged between 9 and 25%. Furthermore, regional 11C-raclopride BPND values correlated with previously determined 18F-fallypride BPND values (ρ = 0.97 and 0.92 in correlations with and without striatal values, respectively, p < 0.01) and postmortem determined D2-receptor densities (including striatum: ρ = 0.92; p < 0.001; excluding striatum: ρ = 0.75; p = 0.067). These observations suggest that extrastriatal 11C-raclopride measurements represent a true D2 signal.
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Affiliation(s)
- Nina Karalija
- Department of Radiation Sciences, Umeå University, Umeå, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden
| | - Lars Jonassson
- Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden.,Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
| | - Jarkko Johansson
- Department of Radiation Sciences, Umeå University, Umeå, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden
| | - Goran Papenberg
- Aging Research Center, Karolinska Institutet and Stockholm University, Stockholm, Sweden
| | - Alireza Salami
- Department of Radiation Sciences, Umeå University, Umeå, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden.,Department of Integrative Medical Biology, Umeå University, Umeå, Sweden.,Aging Research Center, Karolinska Institutet and Stockholm University, Stockholm, Sweden.,Wallenberg Centre for Molecular Medicine, Lund, Sweden
| | - Micael Andersson
- Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden.,Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
| | - Katrine Riklund
- Department of Radiation Sciences, Umeå University, Umeå, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden
| | - Lars Nyberg
- Department of Radiation Sciences, Umeå University, Umeå, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden.,Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
| | - Carl-Johan Boraxbekk
- Department of Radiation Sciences, Umeå University, Umeå, Sweden.,Umeå Center for Functional Brain Imaging (UFBI), Umeå University, Umeå, Sweden.,Danish Research Center for Magnetic Resonance, Center for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital, Hvidovre, Denmark
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8
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Jonasson LS, Nyberg L, Axelsson J, Kramer AF, Riklund K, Boraxbekk CJ. Higher striatal D2-receptor availability in aerobically fit older adults but non-selective intervention effects after aerobic versus resistance training. Neuroimage 2019; 202:116044. [PMID: 31352122 DOI: 10.1016/j.neuroimage.2019.116044] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 07/15/2019] [Accepted: 07/21/2019] [Indexed: 12/16/2022] Open
Abstract
There is much evidence that dopamine is vital for cognitive functioning in aging. Here we tested the hypothesis that aerobic exercise and fitness influence dopaminergic neurotransmission in the striatum, and in turn performance on offline working-memory updating tasks. Dopaminergic neurotransmission was measured by positron emission tomography (PET) and the non-displacable binding potential (BPND) of [11C]raclopride, i.e. dopamine (DA) D2-receptor (D2R) availability. Fifty-four sedentary older adults underwent a six-months exercise intervention, performing either aerobic exercise or stretching, toning, and resistance active control training. At baseline, higher aerobic fitness levels (VO2peak) were associated with higher BPND in the striatum, providing evidence of a link between an objective measure of aerobic fitness and D2R in older adults. BPND decreased substantially over the intervention in both groups but the intervention effects were non-selective with respect to exercise group. The decrease was several times larger than any previously estimated annual decline in D2R, potentially due to increased endogenous DA. Working-memory was unrelated to D2R both at baseline and following the intervention. To conclude, we provide partial evidence for a link between physical exercise and DA. Utilizing a PET protocol able to disentangle both D2R and DA levels could shed further light on whether, and how, aerobic exercise impacts the dopaminergic system in older adults.
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Affiliation(s)
- Lars S Jonasson
- Department of Integrative Medical Biology, Physiology, Umeå University, Umeå, Sweden; Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden.
| | - Lars Nyberg
- Department of Integrative Medical Biology, Physiology, Umeå University, Umeå, Sweden; Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden; Department of Radiation Sciences, Umeå University, Umeå, Sweden.
| | - Jan Axelsson
- Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden; Department of Radiation Sciences, Umeå University, Umeå, Sweden.
| | - Arthur F Kramer
- Departments of Psychology and Mechanical and Industrial Engineering, Northeastern University, Boston, MA, USA; Beckman Institute, University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, USA.
| | - Katrine Riklund
- Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden; Department of Radiation Sciences, Umeå University, Umeå, Sweden.
| | - Carl-Johan Boraxbekk
- Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden; Center for Demographic and Aging Research, Umeå University, Umeå, Sweden; Danish Research Centre for Magnetic Resonance, Copenhagen University Hospital, Hvidovre, Denmark.
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9
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Juarez EJ, Samanez-Larkin GR. Exercise, Dopamine, and Cognition in Older Age. Trends Cogn Sci 2019; 23:986-988. [PMID: 31703928 DOI: 10.1016/j.tics.2019.10.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 10/20/2019] [Indexed: 02/07/2023]
Abstract
Jonasson et al. investigated whether individual differences in human dopamine receptors (D2R) were related to cognitive performance before and after a 6-month aerobic exercise intervention (compared with active control). While D2R decreased (perhaps counterintuitively) with exercise, there was no relationship between D2R and working memory at baseline or following exercise.
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Affiliation(s)
- Eric J Juarez
- Department of Psychology and Neuroscience, Duke University, Durham, NC, USA; Center for Cognitive Neuroscience, Duke University, Durham, NC, USA.
| | - Gregory R Samanez-Larkin
- Department of Psychology and Neuroscience, Duke University, Durham, NC, USA; Center for Cognitive Neuroscience, Duke University, Durham, NC, USA
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10
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Juarez EJ, Castrellon JJ, Green MA, Crawford JL, Seaman KL, Smith CT, Dang LC, Matuskey D, Morris ED, Cowan RL, Zald DH, Samanez-Larkin GR. Reproducibility of the correlative triad among aging, dopamine receptor availability, and cognition. Psychol Aging 2019; 34:921-932. [PMID: 31589058 PMCID: PMC6829049 DOI: 10.1037/pag0000403] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The evidence that dopamine function mediates the association between aging and cognition is one of the most cited findings in the cognitive neuroscience of aging. However, few and relatively small studies have directly examined these associations. Here we examined correlations among adult age, dopamine D2-like receptor (D2R) availability, and cognition in two cross-sectional studies of healthy human adults. Participants completed a short cognitive test battery and, on a separate day, a PET scan with either the high-affinity D2R tracer [18F]Fallypride (Study 1) or [11C]FLB457 (Study 2). Digit span, a measure of short-term memory maintenance and working memory, was the only cognitive test for which dopamine D2R availability partially mediated the age effect on cognition. In Study 1, age was negatively correlated with digit span. Striatal D2R availability was positively correlated with digit span controlling for age. The age effect on digit span was smaller when controlling for striatal D2R availability. Although other cognitive measures used here have individually been associated with age and D2R availability in prior studies, we found no consistent evidence for significant associations between low D2R availability and low cognitive performance on these measures. These results at best only partially supported the correlative triad of age, dopamine D2R availability, and cognition. While a wealth of other research in human and nonhuman animals demonstrates that dopamine makes critical contributions to cognition, the present studies suggest caution in interpreting PET findings as evidence that dopamine D2R loss is a primary cause of broad age-related declines in fluid cognition. (PsycINFO Database Record (c) 2019 APA, all rights reserved).
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Affiliation(s)
| | | | | | | | | | | | - Linh C Dang
- Department of Psychology, Vanderbilt University
| | - David Matuskey
- Department of Radiology and Biomedical Imaging, Yale University
| | - Evan D Morris
- Department of Radiology and Biomedical Imaging, Yale University
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11
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Papenberg G, Karalija N, Salami A, Andersson M, Axelsson J, Riklund K, Lindenberger U, Nyberg L, Bäckman L. The Influence of Hippocampal Dopamine D2 Receptors on Episodic Memory Is Modulated by BDNF and KIBRA Polymorphisms. J Cogn Neurosci 2019; 31:1422-1429. [PMID: 31112471 DOI: 10.1162/jocn_a_01429] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Episodic memory is a polygenic trait influenced by different molecular mechanisms. We used PET and a candidate gene approach to investigate how individual differences at the molecular level translate into between-person differences in episodic memory performance of elderly persons. Specifically, we examined the interactive effects between hippocampal dopamine D2 receptor (D2DR) availability and candidate genes relevant for hippocampus-related memory functioning. We show that the positive effects of high D2DR availability in the hippocampus on episodic memory are confined to carriers of advantageous genotypes of the brain-derived neurotrophic factor (BDNF, rs6265) and the kidney and brain expressed protein (KIBRA, rs17070145) polymorphisms. By contrast, these polymorphisms did not modulate the positive relationship between caudate D2DR availability and episodic memory.
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Affiliation(s)
| | | | - Alireza Salami
- Karolinska Institute and Stockholm University.,Umeå University
| | | | | | | | - Ulman Lindenberger
- Max Planck Institute for Human Development, Berlin.,Max Planck UCL Centre for Computational Psychiatry and Ageing Research, Berlin and London
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