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Krebs C, Brill E, Minkova L, Federspiel A, Kellner-Weldon F, Wyss P, Teunissen CE, van Harten AC, Seydell-Greenwald A, Klink K, Züst MA, Brem AK, Klöppel S. Investigating Compensatory Brain Activity in Older Adults with Subjective Cognitive Decline. J Alzheimers Dis 2023; 93:107-124. [PMID: 36970895 DOI: 10.3233/jad-221001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
BACKGROUND Preclinical Alzheimer's disease (AD) is one possible cause of subjective cognitive decline (SCD). Normal task performance despite ongoing neurodegeneration is typically considered as neuronal compensation, which is reflected by greater neuronal activity. Compensatory brain activity has been observed in frontal as well as parietal regions in SCD, but data are scarce, especially outside the memory domain. OBJECTIVE To investigate potential compensatory activity in SCD. Such compensatory activity is particularly expected in participants where blood-based biomarkers indicated amyloid positivity as this implies preclinical AD. METHODS 52 participants with SCD (mean age: 71.00±5.70) underwent structural and functional neuroimaging (fMRI), targeting episodic memory and spatial abilities, and a neuropsychological assessment. The estimation of amyloid positivity was based on plasma amyloid-β and phosphorylated tau (pTau181) measures. RESULTS Our fMRI analyses of the spatial abilities task did not indicate compensation, with only three voxels exceeding an uncorrected threshold at p < 0.001. This finding was not replicated in a subset of 23 biomarker positive individuals. CONCLUSION Our results do not provide conclusive evidence for compensatory brain activity in SCD. It is possible that neuronal compensation does not manifest at such an early stage as SCD. Alternatively, it is possible that our sample size was too small or that compensatory activity may be too heterogeneous to be detected by group-level statistics. Interventions based on the individual fMRI signal should therefore be explored.
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Affiliation(s)
- Christine Krebs
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
- Swiss Institute for Translational and Entrepreneurial Medicine, Bern, Switzerland
| | - Esther Brill
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
- Swiss Institute for Translational and Entrepreneurial Medicine, Bern, Switzerland
- Graduate School for Health Sciences, University of Bern, Bern, Switzerland
| | - Lora Minkova
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Andrea Federspiel
- Translational Research Center, University Hospital of Psychiatry and Psychotherapy, University of Ber, Bern, Switzerland
| | - Frauke Kellner-Weldon
- Section Neuroradiology of the Department of Radiology, Cantonal Hospital Lucerne, Lucerne, Switzerland
| | - Patric Wyss
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Charlotte E Teunissen
- Neurochemistry Laboratory, Department of Clinical Chemistry, Amsterdam Vrije University, Amsterdam, the Netherlands
| | - Argonde C van Harten
- Alzheimer Center Amsterdam, Department of Neurology, Amsterdam Neuroscience, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | | | - Katharina Klink
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Marc A Züst
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Anna-Katharine Brem
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
- Department of Old Age Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom
| | - Stefan Klöppel
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
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Brill E, Krebs C, Falkner M, Peter J, Henke K, Züst M, Minkova L, Brem AK, Klöppel S. Can a serious game-based cognitive training attenuate cognitive decline related to Alzheimer's disease? Protocol for a randomized controlled trial. BMC Psychiatry 2022; 22:552. [PMID: 35962371 PMCID: PMC9373273 DOI: 10.1186/s12888-022-04131-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Accepted: 07/12/2022] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Alzheimer's disease (AD) is a major public health issue. Cognitive interventions such as computerized cognitive trainings (CCT) are effective in attenuating cognitive decline in AD. However, in those at risk of dementia related to AD, results are heterogeneous. Efficacy and feasibility of CCT needs to be explored in depth. Moreover, underlying mechanisms of CCT effects on the three cognitive domains typically affected by AD (episodic memory, semantic memory and spatial abilities) remain poorly understood. METHODS In this bi-centric, randomized controlled trial (RCT) with parallel groups, participants (planned N = 162, aged 60-85 years) at risk for AD and with at least subjective cognitive decline will be randomized to one of three groups. We will compare serious game-based CCT against a passive wait list control condition and an active control condition (watching documentaries). Training will consist of daily at-home sessions for 10 weeks (50 sessions) and weekly on-site group meetings. Subsequently, the CCT group will continue at-home training for an additional twenty-weeks including monthly on-site booster sessions. Investigators conducting the cognitive assessments will be blinded. Group leaders will be aware of participants' group allocations. Primarily, we will evaluate change using a compound value derived from the comprehensive cognitive assessment for each of three cognitive domains. Secondary, longitudinal functional and structural magnetic resonance imaging (MRI) and evaluation of blood-based biomarkers will serve to investigate neuronal underpinnings of expected training benefits. DISCUSSION The present study will address several shortcomings of previous CCT studies. This entails a comparison of serious game-based CCT with both a passive and an active control condition while including social elements crucial for training success and adherence, the combination of at-home and on-site training, inclusion of booster sessions and assessment of physiological markers. Study outcomes will provide information on feasibility and efficacy of serious game-based CCT in older adults at risk for AD and will potentially generalize to treatment guidelines. Moreover, we set out to investigate physiological underpinnings of CCT induced neuronal changes to form the grounds for future individually tailored interventions and neuro-biologically informed trainings. TRIAL REGISTRATION This RCT was registered 1st of July 2020 at clinicaltrials.gov (Identifier NCT04452864).
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Affiliation(s)
- Esther Brill
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland.
- Swiss Institute for Translational and Entrepreneurial Medicine, Bern, Switzerland.
- Graduate School for Health Sciences, University of Bern, Bern, Switzerland.
| | - Christine Krebs
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
- Swiss Institute for Translational and Entrepreneurial Medicine, Bern, Switzerland
| | - Michael Falkner
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
- ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
| | - Jessica Peter
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
- Swiss Institute for Translational and Entrepreneurial Medicine, Bern, Switzerland
| | - Katharina Henke
- Cognitive Neuroscience of Memory and Consciousness, Institute of Psychology, University of Bern, Bern, Switzerland
| | - Marc Züst
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Lora Minkova
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Anna-Katharine Brem
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
- Department of Old Age Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Stefan Klöppel
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
- Swiss Institute for Translational and Entrepreneurial Medicine, Bern, Switzerland
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3
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Minkova L, Peter J, Abdulkadir A, Schumacher LV, Kaller CP, Nissen C, Klöppel S, Lahr J. Determinants of Inter-Individual Variability in Corticomotor Excitability Induced by Paired Associative Stimulation. Front Neurosci 2019; 13:841. [PMID: 31474818 PMCID: PMC6702284 DOI: 10.3389/fnins.2019.00841] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 07/26/2019] [Indexed: 12/23/2022] Open
Abstract
Transcranial magnetic stimulation (TMS) is a well-established tool in probing cortical plasticity in vivo. Changes in corticomotor excitability can be induced using paired associative stimulation (PAS) protocol, in which TMS over the primary motor cortex is conditioned with an electrical peripheral nerve stimulation of the contralateral hand. PAS with an inter-stimulus interval of 25 ms induces long-term potentiation (LTP)-like effects in cortical excitability. However, the response to a PAS protocol tends to vary substantially across individuals. In this study, we used univariate and multivariate data-driven methods to investigate various previously proposed determinants of inter-individual variability in PAS efficacy, such as demographic, cognitive, clinical, neurophysiological, and neuroimaging measures. Forty-one right-handed participants, comprising 22 patients with amnestic mild cognitive impairment (MCI) and 19 healthy controls (HC), underwent the PAS protocol. Prior to stimulation, demographic, genetic, clinical, as well as structural and resting-state functional MRI data were acquired. The two groups did not differ in any of the variables, except by global cognitive status. Univariate analysis showed that only 61% of all participants were classified as PAS responders, irrespective of group membership. Higher PAS response was associated with lower TMS intensity and with higher resting-state connectivity within the sensorimotor network, but only in responders, as opposed to non-responders. We also found an overall positive correlation between PAS response and structural connectivity within the corticospinal tract, which did not differ between groups. A multivariate random forest (RF) model identified age, gender, education, IQ, global cognitive status, sleep quality, alertness, TMS intensity, genetic factors, and neuroimaging measures (functional and structural connectivity, gray matter (GM) volume, and cortical thickness as poor predictors of PAS response. The model resulted in low accuracy of the RF classifier (58%; 95% CI: 42 - 74%), with a higher relative importance of brain connectivity measures compared to the other variables. We conclude that PAS variability in our sample was not well explained by factors known to influence PAS efficacy, emphasizing the need for future replication studies.
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Affiliation(s)
- Lora Minkova
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland.,Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Freiburg Brain Imaging, Medical Center - University of Freiburg, Freiburg, Germany
| | - Jessica Peter
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Ahmed Abdulkadir
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Lena V Schumacher
- Department of Medical Psychology and Medical Sociology, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Christoph P Kaller
- Freiburg Brain Imaging, Medical Center - University of Freiburg, Freiburg, Germany.,Department of Neuroradiology, Medical Center - Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Christoph Nissen
- Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,University Hospital of Psychiatry and Psychotherapy, University Psychiatric Services, University of Bern, Bern, Switzerland.,Department of Neurology, University Hospital Bern, University of Bern, Bern, Switzerland
| | - Stefan Klöppel
- University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland.,Center for Geriatrics and Gerontology Freiburg, Medical Center - Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Jacob Lahr
- Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Freiburg Brain Imaging, Medical Center - University of Freiburg, Freiburg, Germany
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4
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Gregory S, Long JD, Kloppel S, Razi A, Scheller E, Minkova L, Johnson EB, Durr A, Roos RAC, Leavitt BR, Mills JA, Stout JC, Scahill RI, Tabrizi SJ, Rees G. E11 Compensation in huntington’s disease. Imaging 2018. [DOI: 10.1136/jnnp-2018-ehdn.105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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5
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Gregory S, Long JD, Klöppel S, Razi A, Scheller E, Minkova L, Johnson EB, Durr A, Roos RAC, Leavitt BR, Mills JA, Stout JC, Scahill RI, Tabrizi SJ, Rees G. Testing a longitudinal compensation model in premanifest Huntington's disease. Brain 2018; 141:2156-2166. [PMID: 29788038 PMCID: PMC6022638 DOI: 10.1093/brain/awy122] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 02/20/2018] [Accepted: 03/10/2018] [Indexed: 01/07/2023] Open
Abstract
The initial stages of neurodegeneration are commonly marked by normal levels of cognitive and motor performance despite the presence of structural brain pathology. Compensation is widely assumed to account for this preserved behaviour, but despite the apparent simplicity of such a concept, it has proven incredibly difficult to demonstrate such a phenomenon and distinguish it from disease-related pathology. Recently, we developed a model of compensation whereby brain activation, behaviour and pathology, components key to understanding compensation, have specific longitudinal trajectories over three phases of progression. Here, we empirically validate our explicit mathematical model by testing for the presence of compensation over time in neurodegeneration. Huntington's disease is an ideal model for examining longitudinal compensation in neurodegeneration as it is both monogenic and fully penetrant, so disease progression and potential compensation can be monitored many years prior to diagnosis. We defined our conditions for compensation as non-linear longitudinal trajectories of brain activity and performance in the presence of linear neuronal degeneration and applied our model of compensation to a large longitudinal cohort of premanifest and early-stage Huntington's disease patients from the multisite Track-On HD study. Focusing on cognitive and motor networks, we integrated progressive volume loss, task and resting state functional MRI and cognitive and motor behaviour across three sequential phases of neurodegenerative disease progression, adjusted for genetic disease load. Multivariate linear mixed models were fitted and trajectories for each variable tested. Our conceptualization of compensation was partially realized across certain motor and cognitive networks at differing levels. We found several significant network trends that were more complex than that hypothesized in our model. These trends suggest changes to our theoretical model where the network effects are delayed relative to performance effects. There was evidence of compensation primarily in the prefrontal component of the cognitive network, with increased effective connectivity between the left and right dorsolateral prefrontal cortex. Having developed an operational model for the explicit testing of longitudinal compensation in neurodegeneration, it appears that general patterns of our framework are consistent with the empirical data. With the proposed modifications, our operational model of compensation can be used to test for both cross-sectional and longitudinal compensation in neurodegenerative disease with similar patterns to Huntington's disease.
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Affiliation(s)
- Sarah Gregory
- Huntington’s disease Research Centre, UCL Institute of Neurology, University College London, London, UK
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK
| | - Jeffrey D Long
- Department of Psychiatry, Carver College of Medicine, University of Iowa, Iowa, City, IA, USA
- Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, IA, USA
| | - Stefan Klöppel
- University Hospital for Old Age Psychiatry, Murtenstrasse 21, 3010 Bern, Switzerland
- Department of Psychiatry and Psychotherapy, Medical Center, University of Freiburg, Freiburg, Germany
| | - Adeel Razi
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK
- Department of Electronic Engineering, N.E.D University of Engineering and Technology, Karachi, Pakistan
| | - Elisa Scheller
- Department of Psychiatry and Psychotherapy, Medical Center, University of Freiburg, Freiburg, Germany
- Freiburg Brain Imaging Division, Medical Center, University of Freiburg, Freiburg, Germany
| | - Lora Minkova
- Department of Psychiatry and Psychotherapy, Medical Center, University of Freiburg, Freiburg, Germany
- Freiburg Brain Imaging Division, Medical Center, University of Freiburg, Freiburg, Germany
| | - Eileanoir B Johnson
- Huntington’s disease Research Centre, UCL Institute of Neurology, University College London, London, UK
- Department of Neurodegenerative Disease, UCL Institute of Neurology, University College London, London, UK
| | - Alexandra Durr
- ICM - Institut du Cerveau et de la Moelle Epinière, INSERM U1127, CNRS UMR7225, Sorbonne Universités – UPMC Université Paris VI UMR_S1127and APHP, Genetic department, Pitié-Salpêtrière University Hospital, Paris, France
| | - Raymund A C Roos
- Leiden University Medical Center, Department of Neurology, Leiden, The Netherlands
| | - Blair R Leavitt
- Centre for Molecular Medicine and Therapeutics, Department of Medical Genetics, University of British Columbia, Canada
| | - James A Mills
- Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, IA, USA
| | - Julie C Stout
- School of Psychological Sciences and Institute of Clinical and Cognitive Neuroscience, Monash University, Melbourne, Australia
| | - Rachael I Scahill
- Huntington’s disease Research Centre, UCL Institute of Neurology, University College London, London, UK
- Department of Neurodegenerative Disease, UCL Institute of Neurology, University College London, London, UK
| | - Sarah J Tabrizi
- Huntington’s disease Research Centre, UCL Institute of Neurology, University College London, London, UK
- Department of Neurodegenerative Disease, UCL Institute of Neurology, University College London, London, UK
| | - Geraint Rees
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK
- Institute of Cognitive Neuroscience, University College London, London, UK
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Lahr J, Minkova L, Tabrizi SJ, Stout JC, Klöppel S, Scheller E. Working Memory-Related Effective Connectivity in Huntington's Disease Patients. Front Neurol 2018; 9:370. [PMID: 29915555 PMCID: PMC5994408 DOI: 10.3389/fneur.2018.00370] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Accepted: 05/07/2018] [Indexed: 11/30/2022] Open
Abstract
Huntington’s disease (HD) is a genetically caused neurodegenerative disorder characterized by heterogeneous motor, psychiatric, and cognitive symptoms. Although motor symptoms may be the most prominent presentation, cognitive symptoms such as memory deficits and executive dysfunction typically co-occur. We used functional magnetic resonance imaging (fMRI) and task fMRI-based dynamic causal modeling (DCM) to evaluate HD-related changes in the neural network underlying working memory (WM). Sixty-four pre-symptomatic HD mutation carriers (preHD), 20 patients with early manifest HD symptoms (earlyHD), and 83 healthy control subjects performed an n-back fMRI task with two levels of WM load. Effective connectivity was assessed in five predefined regions of interest, comprising bilateral inferior parietal cortex, left anterior cingulate cortex, and bilateral dorsolateral prefrontal cortex. HD mutation carriers performed less accurately and more slowly at high WM load compared with the control group. While between-group comparisons of brain activation did not reveal differential recruitment of the cortical WM network in mutation carriers, comparisons of brain connectivity as identified with DCM revealed a number of group differences across the whole WM network. Most strikingly, we observed decreasing connectivity from several regions toward right dorsolateral prefrontal cortex (rDLPFC) in preHD and even more so in earlyHD. The deterioration in rDLPFC connectivity complements results from previous studies and might mirror beginning cortical neural decline at premanifest and early manifest stages of HD. We were able to characterize effective connectivity in a WM network of HD mutation carriers yielding further insight into patterns of cognitive decline and accompanying neural deterioration.
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Affiliation(s)
- Jacob Lahr
- Department of Psychiatry and Psychotherapy, Faculty of Medicine, University Medical Center Freiburg, Freiburg, Germany.,Freiburg Brain Imaging Center, Faculty of Medicine, University Medical Center Freiburg, Freiburg, Germany
| | - Lora Minkova
- Department of Psychiatry and Psychotherapy, Faculty of Medicine, University Medical Center Freiburg, Freiburg, Germany.,Freiburg Brain Imaging Center, Faculty of Medicine, University Medical Center Freiburg, Freiburg, Germany
| | - Sarah J Tabrizi
- Department of Neurodegenerative Disease, Institute of Neurology, University College London, London, United Kingdom
| | - Julie C Stout
- School of Psychological Sciences, Institute of Clinical and Cognitive Neuroscience, Monash University, Melbourne, VIC, Australia
| | - Stefan Klöppel
- Department of Psychiatry and Psychotherapy, Faculty of Medicine, University Medical Center Freiburg, Freiburg, Germany.,Freiburg Brain Imaging Center, Faculty of Medicine, University Medical Center Freiburg, Freiburg, Germany.,Center for Geriatric Medicine and Gerontology, Faculty of Medicine, University Medical Center Freiburg, Freiburg, Germany.,University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Elisa Scheller
- Department of Psychiatry and Psychotherapy, Faculty of Medicine, University Medical Center Freiburg, Freiburg, Germany.,Freiburg Brain Imaging Center, Faculty of Medicine, University Medical Center Freiburg, Freiburg, Germany.,Department of Psychology, Laboratory for Biological and Personality Psychology, University of Freiburg, Freiburg, Germany
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7
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Peter J, Lahr J, Minkova L, Lauer E, Grothe MJ, Teipel S, Köstering L, Kaller CP, Heimbach B, Hüll M, Normann C, Nissen C, Reis J, Klöppel S. Contribution of the Cholinergic System to Verbal Memory Performance in Mild Cognitive Impairment. J Alzheimers Dis 2018; 53:991-1001. [PMID: 27340852 PMCID: PMC5008225 DOI: 10.3233/jad-160273] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Acetylcholine is critically involved in modulating learning and memory function, which both decline in neurodegeneration. It remains unclear to what extent structural and functional changes in the cholinergic system contribute to episodic memory dysfunction in mild cognitive impairment (MCI), in addition to hippocampal degeneration. A better understanding is critical, given that the cholinergic system is the main target of current symptomatic treatment in mild to moderate Alzheimer's disease. We simultaneously assessed the structural and functional integrity of the cholinergic system in 20 patients with MCI and 20 matched healthy controls and examined their effect on verbal episodic memory via multivariate regression analyses. Mediating effects of either cholinergic function or hippocampal volume on the relationship between cholinergic structure and episodic memory were computed. In MCI, a less intact structure and function of the cholinergic system was found. A smaller cholinergic structure was significantly correlated with a functionally more active cholinergic system in patients, but not in controls. This association was not modulated by age or disease severity, arguing against compensational processes. Further analyses indicated that neither functional nor structural changes in the cholinergic system influence verbal episodic memory at the MCI stage. In fact, those associations were fully mediated by hippocampal volume. Although the cholinergic system is structurally and functionally altered in MCI, episodic memory dysfunction results primarily from hippocampal neurodegeneration, which may explain the inefficiency of cholinergic treatment at this disease stage.
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Affiliation(s)
- Jessica Peter
- Freiburg Brain Imaging, Faculty of Medicine, University of Freiburg, Germany.,Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Freiburg, Germany.,Department of Neurology, Faculty of Medicine, University of Freiburg, Germany
| | - Jacob Lahr
- Freiburg Brain Imaging, Faculty of Medicine, University of Freiburg, Germany.,Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Freiburg, Germany
| | - Lora Minkova
- Freiburg Brain Imaging, Faculty of Medicine, University of Freiburg, Germany.,Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Freiburg, Germany.,Department of Psychology, Laboratory for Biological and Personality Psychology, University of Freiburg, Germany
| | - Eliza Lauer
- Freiburg Brain Imaging, Faculty of Medicine, University of Freiburg, Germany
| | - Michel J Grothe
- German Centre for Neurodegenerative Diseases (DZNE), Rostock/Greifswald, Germany
| | - Stefan Teipel
- German Centre for Neurodegenerative Diseases (DZNE), Rostock/Greifswald, Germany
| | - Lena Köstering
- Freiburg Brain Imaging, Faculty of Medicine, University of Freiburg, Germany.,Department of Neurology, Faculty of Medicine, University of Freiburg, Germany.,Department of Neuroradiology, Faculty of Medicine, University of Freiburg, Germany
| | - Christoph P Kaller
- Freiburg Brain Imaging, Faculty of Medicine, University of Freiburg, Germany.,Department of Neurology, Faculty of Medicine, University of Freiburg, Germany.,BrainLinks-BrainTools Cluster of Excellence, University of Freiburg, Germany
| | - Bernhard Heimbach
- Department of Neurology, Faculty of Medicine, University of Freiburg, Germany.,Centre for Geriatric Medicine and Gerontology, Faculty of Medicine, University of Freiburg, Germany
| | - Michael Hüll
- Centre for Geriatric Medicine and Gerontology, Faculty of Medicine, University of Freiburg, Germany.,Centre for Psychiatry Emmendingen, Germany
| | - Claus Normann
- Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Freiburg, Germany
| | - Christoph Nissen
- Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Freiburg, Germany
| | - Janine Reis
- Department of Neurology, Faculty of Medicine, University of Freiburg, Germany
| | - Stefan Klöppel
- Freiburg Brain Imaging, Faculty of Medicine, University of Freiburg, Germany.,Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Freiburg, Germany.,Centre for Geriatric Medicine and Gerontology, Faculty of Medicine, University of Freiburg, Germany
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8
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Peter J, Sandkamp R, Minkova L, Schumacher LV, Kaller CP, Abdulkadir A, Klöppel S. Real-world navigation in amnestic mild cognitive impairment: The relation to visuospatial memory and volume of hippocampal subregions. Neuropsychologia 2018; 109:86-94. [DOI: 10.1016/j.neuropsychologia.2017.12.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 12/05/2017] [Accepted: 12/07/2017] [Indexed: 11/29/2022]
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9
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Minkova L, Gregory S, Scahill RI, Abdulkadir A, Kaller CP, Peter J, Long JD, Stout JC, Reilmann R, Roos RA, Durr A, Leavitt BR, Tabrizi SJ, Klöppel S. Cross-sectional and longitudinal voxel-based grey matter asymmetries in Huntington's disease. Neuroimage Clin 2017; 17:312-324. [PMID: 29527479 PMCID: PMC5842644 DOI: 10.1016/j.nicl.2017.10.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 10/18/2017] [Accepted: 10/23/2017] [Indexed: 11/22/2022]
Abstract
Huntington's disease (HD) is a progressive neurodegenerative disorder that can be genetically confirmed with certainty decades before clinical onset. This allows the investigation of functional and structural changes in HD many years prior to disease onset, which may reveal important mechanistic insights into brain function, structure and organization in general. While regional atrophy is present at early stages of HD, it is still unclear if both hemispheres are equally affected by neurodegeneration and how the extent of asymmetry affects domain-specific functional decline. Here, we used whole-brain voxel-based analysis to investigate cross-sectional and longitudinal hemispheric asymmetries in grey matter (GM) volume in 56 manifest HD (mHD), 83 pre-manifest HD (preHD), and 80 healthy controls (HC). Furthermore, a regression analysis was used to assess the relationship between neuroanatomical asymmetries and decline in motor and cognitive measures across the disease spectrum. The cross-sectional analysis showed striatal leftward-biased GM atrophy in mHD, but not in preHD, relative to HC. Longitudinally, no net 36-month change in GM asymmetries was found in any of the groups. In the regression analysis, HD-related decline in quantitative-motor (Q-Motor) performance was linked to lower GM volume in the left superior parietal cortex. These findings suggest a stronger disease effect targeting the left hemisphere, especially in those with declining motor performance. This effect did not change over a period of three years and may indicate a compensatory role of the right hemisphere in line with recent functional imaging studies.
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Affiliation(s)
- Lora Minkova
- Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Freiburg, Germany; Freiburg Brain Imaging Center, Medical Center - University of Freiburg, Germany; Department of Psychology, Laboratory for Biological and Personality Psychology, University of Freiburg, Freiburg, Germany.
| | - Sarah Gregory
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK
| | - Rachael I Scahill
- Department of Neurodegenerative Disease, Institute of Neurology, University College London, London, UK
| | - Ahmed Abdulkadir
- Department of Computer Science, University of Freiburg, Freiburg, Germany; University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Christoph P Kaller
- Freiburg Brain Imaging Center, Medical Center - University of Freiburg, Germany; Department of Neurology, Medical Center - University of Freiburg, Freiburg, Germany; BrainLinks-BrainTools Cluster of Excellence, University of Freiburg, Freiburg, Germany
| | - Jessica Peter
- Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Freiburg, Germany; University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Jeffrey D Long
- Department of Psychiatry, Carver College of Medicine, The University of Iowa, Iowa City, IA, USA; Department of Biostatistics, College of Public Health, The University of Iowa, Iowa City, IA, USA
| | - Julie C Stout
- School of Psychology and Psychiatry, Monash University, Victoria, Australia
| | - Ralf Reilmann
- George-Huntington-Institute, Münster, Germany; Department of Radiology, University of Münster, Münster, Germany; Department of Neurodegeneration, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Raymund A Roos
- Department of Neurology, Leiden University Medical Centre, Leiden, Netherlands
| | - Alexandra Durr
- APHP Department of Genetics, ICM (Brain and Spine Institute) Pitié-Salpêtrière University Hospital Paris, France
| | - Blair R Leavitt
- Centre for Molecular Medicine and Therapeutics, Department of Medical Genetics, University of British Columbia, Vancouver, Canada
| | - Sarah J Tabrizi
- Department of Neurodegenerative Disease, Institute of Neurology, University College London, London, UK
| | - Stefan Klöppel
- Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Freiburg, Germany; University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
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10
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Minkova L, Habich A, Peter J, Kaller CP, Eickhoff SB, Klöppel S. Gray matter asymmetries in aging and neurodegeneration: A review and meta-analysis. Hum Brain Mapp 2017; 38:5890-5904. [PMID: 28856766 DOI: 10.1002/hbm.23772] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 08/03/2017] [Accepted: 08/20/2017] [Indexed: 01/15/2023] Open
Abstract
Inter-hemispheric asymmetries are a common phenomenon of the human brain. Some evidence suggests that neurodegeneration related to aging and disease may preferentially affect the left-usually language- and motor-dominant-hemisphere. Here, we used activation likelihood estimation meta-analysis to assess gray matter (GM) loss and its lateralization in healthy aging and in neurodegeneration, namely, mild cognitive impairment (MCI), Alzheimer's dementia (AD), Parkinson's disease (PD), and Huntington's disease (HD). This meta-analysis, comprising 159 voxel-based morphometry publications (enrolling 4,469 patients and 4,307 controls), revealed that GM decline appeared to be asymmetric at trend levels but provided no evidence for increased left-hemisphere vulnerability. Regions with asymmetric GM decline were located in areas primarily affected by neurodegeneration. In HD, the left putamen showed converging evidence for more pronounced atrophy, while no consistent pattern was found in PD. In MCI, the right hippocampus was more atrophic than its left counterpart, a pattern that reversed in AD. The stability of these findings was confirmed using permutation tests. However, due to the lenient threshold used in the asymmetry analysis, further work is needed to confirm our results and to provide a better understanding of the functional role of GM asymmetries, for instance in the context of cognitive reserve and compensation. Hum Brain Mapp 38:5890-5904, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Lora Minkova
- Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Freiburg Brain Imaging Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Laboratory for Biological and Personality Psychology, Department of Psychology, University of Freiburg, Freiburg, Germany
| | - Annegret Habich
- Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Freiburg Brain Imaging Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Jessica Peter
- Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Freiburg Brain Imaging Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland
| | - Christoph P Kaller
- Freiburg Brain Imaging Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Department of Neurology, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,BrainLinks-BrainTools Cluster of Excellence, University of Freiburg, Freiburg, Germany
| | - Simon B Eickhoff
- Institute of Systems Neuroscience, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany.,Institute of Neuroscience and Medicine (INM-7) Research Centre Jülich, Jülich, Germany
| | - Stefan Klöppel
- Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Freiburg Brain Imaging Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,University Hospital of Old Age Psychiatry and Psychotherapy, University of Bern, Bern, Switzerland.,Center for Geriatric Medicine and Gerontology, Faculty of Medicine, University of Freiburg, Freiburg, Germany
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11
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Minkova L, Sladky R, Kranz GS, Woletz M, Geissberger N, Kraus C, Lanzenberger R, Windischberger C. Task-dependent modulation of amygdala connectivity in social anxiety disorder. Psychiatry Res Neuroimaging 2017; 262:39-46. [PMID: 28226306 DOI: 10.1016/j.pscychresns.2016.12.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 12/12/2016] [Accepted: 12/27/2016] [Indexed: 01/27/2023]
Abstract
Increased amygdala activation is consistently found in patients suffering from social anxiety disorder (SAD), a psychiatric condition characterized by an intense fear of social situations and scrutiny. Disruptions in the amygdalar-frontal network in SAD may explain the inability of frontal regions to appropriately down-regulate amygdalar hyper-activation. In this study, we measured 15 SAD patients and 15 healthy controls during an affective counting Stroop task with emotional faces to assess the interaction of affective stimuli with a cognitive task in SAD, as well as to investigate the causal interactions between the amygdala and the medial orbitofrontal cortex (OFC) using dynamic causal modeling (DCM). Here we show for the first time that differences in OFC-amygdala effective connectivity between SAD patients and healthy controls are influenced by cognitive load during task processing. In SAD patients relative to controls dysfunctional amygdala regulation was observed during passive viewing of harsh faces This could be linked to ongoing self-initiated cognitive processes (such as rumination and anticipation of negative events) that hinder successful amygdala regulation. However, between-group differences diminished during cognitive processing, suggesting that attentional load interfered with emotional processing in both patients and controls.
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Affiliation(s)
- Lora Minkova
- MR Center of Excellence, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Austria; Department of Psychiatry and Psychotherapy, University Medical Center Freiburg, Germany; Freiburg Brain Imaging Center, University Medical Center Freiburg, Germany
| | - Ronald Sladky
- MR Center of Excellence, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Austria
| | - Georg S Kranz
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Austria
| | - Michael Woletz
- MR Center of Excellence, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Austria
| | - Nicole Geissberger
- MR Center of Excellence, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Austria
| | - Christoph Kraus
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Austria
| | - Rupert Lanzenberger
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Austria
| | - Christian Windischberger
- MR Center of Excellence, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Austria.
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12
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Gregory S, Long JD, Klöppel S, Razi A, Scheller E, Minkova L, Papoutsi M, Mills JA, Durr A, Leavitt BR, Roos RAC, Stout JC, Scahill RI, Langbehn DR, Tabrizi SJ, Rees G. Operationalizing compensation over time in neurodegenerative disease. Brain 2017; 140:1158-1165. [PMID: 28334888 PMCID: PMC5382953 DOI: 10.1093/brain/awx022] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 10/26/2016] [Accepted: 12/21/2016] [Indexed: 12/22/2022] Open
Affiliation(s)
- Sarah Gregory
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK
| | - Jeffrey D. Long
- Department of Psychiatry, Carver College of Medicine, University of Iowa, Iowa, City, IA, USA
- Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, IA, USA
| | - Stefan Klöppel
- Albert-Ludwigs-University Freiburg, University Medical Center, Division Freiburg Brain Imaging, Freiburg, Germany
- Albert-Ludwigs-University Freiburg, University Medical Center, Department of Psychiatry and Psychotherapy, Freiburg, Germany
- University Hospital for Old Age Psychiatry, Murtenstrasse 21, 3010 Bern, Switzerland
| | - Adeel Razi
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK
- Department of Electronic Engineering, N.E.D University of Engineering and Technology, Karachi, Pakistan
| | - Elisa Scheller
- Albert-Ludwigs-University Freiburg, University Medical Center, Division Freiburg Brain Imaging, Freiburg, Germany
- Albert-Ludwigs-University Freiburg, University Medical Center, Department of Psychiatry and Psychotherapy, Freiburg, Germany
- Albert-Ludwigs-University Freiburg, Department of Psychology, Laboratory for Biological and Personality Psychology, Freiburg, Germany
| | - Lora Minkova
- Albert-Ludwigs-University Freiburg, University Medical Center, Division Freiburg Brain Imaging, Freiburg, Germany
- Albert-Ludwigs-University Freiburg, University Medical Center, Department of Psychiatry and Psychotherapy, Freiburg, Germany
- Albert-Ludwigs-University Freiburg, Department of Psychology, Laboratory for Biological and Personality Psychology, Freiburg, Germany
| | - Marina Papoutsi
- Department of Neurodegenerative Disease, UCL Institute of Neurology, University College London, London, UK
| | - James A. Mills
- Department of Psychiatry, Carver College of Medicine, University of Iowa, Iowa, City, IA, USA
| | - Alexandra Durr
- APHP Department of Genetics, Groupe Hospitalier Pitié-Salpêtrière, and Institut du Cerveau et de la Moelle, INSERM U1127, CNRS UMR7225, UPMC Université Paris VI UMR_S1127, Paris France
| | - Blair R. Leavitt
- Centre for Molecular Medicine and Therapeutics, Department of Medical Genetics, University of British Columbia, Canada
| | - Raymund A. C. Roos
- Leiden University Medical Center, Department of Neurology, Leiden, The Netherlands
| | - Julie C. Stout
- School of Psychological Sciences and Institute of Clinical and Cognitive Neuroscience, Monash University, Melbourne, Australia
| | - Rachael I. Scahill
- Department of Neurodegenerative Disease, UCL Institute of Neurology, University College London, London, UK
| | - Douglas R. Langbehn
- Department of Psychiatry, Carver College of Medicine, University of Iowa, Iowa, City, IA, USA
- Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, IA, USA
| | - Sarah J. Tabrizi
- Department of Neurodegenerative Disease, UCL Institute of Neurology, University College London, London, UK
| | - Geraint Rees
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK
- Institute of Cognitive Neuroscience, University College London, London, UK
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13
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Gregory S, Long JD, Klöppel S, Razi A, Scheller E, Minkova L, Papoutsi M, Mills JA, Stout J, Scahill RI, Langbehn DR, Tabrizi SJ, Rees G. D20 Operationalising compensation over time in neurodegenerative disease. J Neurol Psychiatry 2016. [DOI: 10.1136/jnnp-2016-314597.119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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14
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Gregory S, Klöppel S, Long JD, Razi A, Scheller E, Minkova L, Dürr A, Roos RAC, Leavitt BR, Mills JA, Stout J, Scahill RI, Langbehn DR, Rees G, Tabrizi SJ. D21 Longitudinal compensation in the cognitive network in huntington’s disease. J Neurol Psychiatry 2016. [DOI: 10.1136/jnnp-2016-314597.120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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15
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Gregory S, Klöppel S, Scheller E, Minkova L, Razi A, Durr A, Roos RAC, Leavitt BR, Papoutsi M, Bernhard Landwehrmeyer G, Reilmann R, Borowsky B, Johnson H, Mills JA, Owen G, Stout J, Scahill RI, Long JD, Rees G, Tabrizi SJ. D22 Compensation in preclinical huntington’s disease: evidence from the track-on HD study. J Neurol Neurosurg Psychiatry 2016. [DOI: 10.1136/jnnp-2016-314597.121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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16
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Orth M, Gregory S, Scahill RI, Mayer IS, Minkova L, Klöppel S, Seunarine KK, Boyd L, Borowsky B, Reilmann R, Bernhard Landwehrmeyer G, Leavitt BR, Roos RA, Durr A, Rees G, Rothwell JC, Langbehn D, Tabrizi SJ. Natural variation in sensory-motor white matter organization influences manifestations of Huntington's disease. Hum Brain Mapp 2016; 37:4615-4628. [PMID: 27477323 DOI: 10.1002/hbm.23332] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 07/19/2016] [Accepted: 07/22/2016] [Indexed: 12/31/2022] Open
Abstract
While the HTT CAG-repeat expansion mutation causing Huntington's disease (HD) is highly correlated with the rate of pathogenesis leading to disease onset, considerable variance in age-at-onset remains unexplained. Therefore, other factors must influence the pathogenic process. We asked whether these factors were related to natural biological variation in the sensory-motor system. In 243 participants (96 premanifest and 35 manifest HD; 112 controls), sensory-motor structural MRI, tractography, resting-state fMRI, electrophysiology (including SEP amplitudes), motor score ratings, and grip force as sensory-motor performance were measured. Following individual modality analyses, we used principal component analysis (PCA) to identify patterns associated with sensory-motor performance, and manifest versus premanifest HD discrimination. We did not detect longitudinal differences over 12 months. PCA showed a pattern of loss of caudate, grey and white matter volume, cortical thickness in premotor and sensory cortex, and disturbed diffusivity in sensory-motor white matter tracts that was connected to CAG repeat length. Two further major principal components appeared in controls and HD individuals indicating that they represent natural biological variation unconnected to the HD mutation. One of these components did not influence HD while the other non-CAG-driven component of axial versus radial diffusivity contrast in white matter tracts were associated with sensory-motor performance and manifest HD. The first component reflects the expected CAG expansion effects on HD pathogenesis. One non-CAG-driven component reveals an independent influence on pathogenesis of biological variation in white matter tracts and merits further investigation to delineate the underlying mechanism and the potential it offers for disease modification. Hum Brain Mapp 37:4615-4628, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Michael Orth
- Department of Neurology, Ulm University Hospital, Ulm, Germany
| | - Sarah Gregory
- Wellcome Trust Centre for Neuroimaging, University College London, London, United Kingdom
| | - Rachael I Scahill
- HD Research Group, UCL Institute of Neurology, Queen Square, London, United Kingdom
| | - Isabella Sm Mayer
- Department of Neurology, Ulm University Hospital, Ulm, Germany.,Sobell Department of Motor Neuroscience and Movement Disorders, University College London Institute of Neurology, Queen Square, London, United Kingdom
| | - Lora Minkova
- Department of Psychiatry and Psychotherapy, Freiburg Brain Imaging, University Medical Center, Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Stefan Klöppel
- Department of Psychiatry and Psychotherapy, Freiburg Brain Imaging, University Medical Center, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Department of Neurology, Freiburg Brain Imaging, University Medical Center, Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Kiran K Seunarine
- Developmental Imaging and Biophysics Section, UCL Institute of Child Health, London, United Kingdom
| | - Lara Boyd
- Centre for Brain Health, University of British Columbia, Vancouver, Canada
| | | | - Ralf Reilmann
- George-Huntington-Institute, Technology-Park Muenster, Muenster, Germany
| | | | - Blair R Leavitt
- Center for Molecular Medicine and Therapeutics and Department of Medical Genetics, Child and Family Research Institute, University of British Columbia, Vancouver, Canada
| | - Raymund Ac Roos
- Department of Neurology, Leiden University Medical Centre, Leiden, Netherlands
| | - Alexandra Durr
- APHP Department of Genetics, Groupe Hospitalier Pitié-Salpêtrière, and Institut Du Cerveau Et De La Moelle, INSERM U1127, CNRS UMR7225, UPMC Université Paris VI UMR_S1127, Paris, France
| | - Geraint Rees
- Wellcome Trust Centre for Neuroimaging, University College London, London, United Kingdom
| | - John C Rothwell
- Sobell Department of Motor Neuroscience and Movement Disorders, University College London Institute of Neurology, Queen Square, London, United Kingdom
| | - Douglas Langbehn
- Departments of Psychiatry and Biostatistics, University of Iowa, Iowa City, Iowa
| | - Sarah J Tabrizi
- Department of Neurodegenerative Disease, University College London, Institute of Neurology, Queen Square, London, United Kingdom
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17
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Minkova L, Eickhoff SB, Abdulkadir A, Kaller CP, Peter J, Scheller E, Lahr J, Roos RA, Durr A, Leavitt BR, Tabrizi SJ, Klöppel S. Large-scale brain network abnormalities in Huntington's disease revealed by structural covariance. Hum Brain Mapp 2016; 37:67-80. [PMID: 26453902 PMCID: PMC6867397 DOI: 10.1002/hbm.23014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 08/10/2015] [Accepted: 09/24/2015] [Indexed: 01/05/2023] Open
Abstract
Huntington's disease (HD) is a progressive neurodegenerative disorder that can be diagnosed with certainty decades before symptom onset. Studies using structural MRI have identified grey matter (GM) loss predominantly in the striatum, but also involving various cortical areas. So far, voxel-based morphometric studies have examined each brain region in isolation and are thus unable to assess the changes in the interrelation of brain regions. Here, we examined the structural covariance in GM volumes in pre-specified motor, working memory, cognitive flexibility, and social-affective networks in 99 patients with manifest HD (mHD), 106 presymptomatic gene mutation carriers (pre-HD), and 108 healthy controls (HC). After correction for global differences in brain volume, we found that increased GM volume in one region was associated with increased GM volume in another. When statistically comparing the groups, no differences between HC and pre-HD were observed, but increased positive correlations were evident for mHD, relative to pre-HD and HC. These findings could be explained by a HD-related neuronal loss heterogeneously affecting the examined network at the pre-HD stage, which starts to dominate structural covariance globally at the manifest stage. Follow-up analyses identified structural connections between frontoparietal motor regions to be linearly modified by disease burden score (DBS). Moderator effects of disease load burden became significant at a DBS level typically associated with the onset of unequivocal HD motor signs. Together with existing findings from functional connectivity analyses, our data indicates a critical role of these frontoparietal regions for the onset of HD motor signs.
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Affiliation(s)
- Lora Minkova
- Department of Psychiatry and PsychotherapyUniversity Medical Center FreiburgFreiburgGermany
- Freiburg Brain Imaging CenterUniversity Medical Center FreiburgFreiburgGermany
- Department of PsychologyLaboratory for Biological and Personality Psychology, University of FreiburgFreiburgGermany
| | - Simon B. Eickhoff
- Department of Clinical Neuroscience and Medical PsychiatryHeinrich‐Heine UniversityDüsseldorfGermany
- Research Center Jülich, Institute of Neuroscience and Medicine (INM‐1), Department of Psychiatry, Psychotherapy and Psychosomatics, University HospitalJülichGermany
| | - Ahmed Abdulkadir
- Freiburg Brain Imaging CenterUniversity Medical Center FreiburgFreiburgGermany
- Department of Computer ScienceUniversity of FreiburgFreiburgGermany
| | - Christoph P. Kaller
- Freiburg Brain Imaging CenterUniversity Medical Center FreiburgFreiburgGermany
- Department of NeurologyUniversity Medical Center FreiburgFreiburgGermany
- BrainLinks‐BrainTools Cluster of Excellence, University of FreiburgFreiburgGermany
| | - Jessica Peter
- Department of Psychiatry and PsychotherapyUniversity Medical Center FreiburgFreiburgGermany
- Freiburg Brain Imaging CenterUniversity Medical Center FreiburgFreiburgGermany
| | - Elisa Scheller
- Department of Psychiatry and PsychotherapyUniversity Medical Center FreiburgFreiburgGermany
- Freiburg Brain Imaging CenterUniversity Medical Center FreiburgFreiburgGermany
| | - Jacob Lahr
- Department of Psychiatry and PsychotherapyUniversity Medical Center FreiburgFreiburgGermany
- Freiburg Brain Imaging CenterUniversity Medical Center FreiburgFreiburgGermany
| | - Raymund A. Roos
- Department of NeurologyLeiden University Medical CentreLeidenNetherlands
| | - Alexandra Durr
- Department of Genetics and CytogeneticsPitié‐ Salpêtrière University HospitalParisFrance
| | - Blair R. Leavitt
- Department of Medical GeneticsCentre for Molecular Medicine and Therapeutics, University of British ColumbiaVancouverCanada
| | - Sarah J. Tabrizi
- Department of Neurodegenerative DiseaseUniversity College London, Institute of NeurologyLondonUnited Kingdom
| | - Stefan Klöppel
- Department of Psychiatry and PsychotherapyUniversity Medical Center FreiburgFreiburgGermany
- Freiburg Brain Imaging CenterUniversity Medical Center FreiburgFreiburgGermany
- Department of NeurologyUniversity Medical Center FreiburgFreiburgGermany
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18
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Minkova L, Scheller E, Peter J, Abdulkadir A, Kaller CP, Roos RA, Durr A, Leavitt BR, Tabrizi SJ, Klöppel S. Detection of Motor Changes in Huntington's Disease Using Dynamic Causal Modeling. Front Hum Neurosci 2015; 9:634. [PMID: 26635585 PMCID: PMC4658414 DOI: 10.3389/fnhum.2015.00634] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 11/06/2015] [Indexed: 11/17/2022] Open
Abstract
Deficits in motor functioning are one of the hallmarks of Huntington's disease (HD), a genetically caused neurodegenerative disorder. We applied functional magnetic resonance imaging (fMRI) and dynamic causal modeling (DCM) to assess changes that occur with disease progression in the neural circuitry of key areas associated with executive and cognitive aspects of motor control. Seventy-seven healthy controls, 62 pre-symptomatic HD gene carriers (preHD), and 16 patients with manifest HD symptoms (earlyHD) performed a motor finger-tapping fMRI task with systematically varying speed and complexity. DCM was used to assess the causal interactions among seven pre-defined regions of interest, comprising primary motor cortex, supplementary motor area (SMA), dorsal premotor cortex, and superior parietal cortex. To capture heterogeneity among HD gene carriers, DCM parameters were entered into a hierarchical cluster analysis using Ward's method and squared Euclidian distance as a measure of similarity. After applying Bonferroni correction for the number of tests, DCM analysis revealed a group difference that was not present in the conventional fMRI analysis. We found an inhibitory effect of complexity on the connection from parietal to premotor areas in preHD, which became excitatory in earlyHD and correlated with putamen atrophy. While speed of finger movements did not modulate the connection from caudal to pre-SMA in controls and preHD, this connection became strongly negative in earlyHD. This second effect did not survive correction for multiple comparisons. Hierarchical clustering separated the gene mutation carriers into three clusters that also differed significantly between these two connections and thereby confirmed their relevance. DCM proved useful in identifying group differences that would have remained undetected by standard analyses and may aid in the investigation of between-subject heterogeneity.
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Affiliation(s)
- Lora Minkova
- Department of Psychiatry and Psychotherapy, University Medical Center Freiburg Freiburg, Germany ; Freiburg Brain Imaging Center, University Medical Center Freiburg Freiburg, Germany ; Laboratory for Biological and Personality Psychology, Department of Psychology, University of Freiburg Freiburg, Germany
| | - Elisa Scheller
- Department of Psychiatry and Psychotherapy, University Medical Center Freiburg Freiburg, Germany ; Freiburg Brain Imaging Center, University Medical Center Freiburg Freiburg, Germany
| | - Jessica Peter
- Department of Psychiatry and Psychotherapy, University Medical Center Freiburg Freiburg, Germany ; Freiburg Brain Imaging Center, University Medical Center Freiburg Freiburg, Germany
| | - Ahmed Abdulkadir
- Freiburg Brain Imaging Center, University Medical Center Freiburg Freiburg, Germany ; Department of Computer Science, University of Freiburg Freiburg, Germany
| | - Christoph P Kaller
- Freiburg Brain Imaging Center, University Medical Center Freiburg Freiburg, Germany ; Department of Neurology, University Medical Center Freiburg Freiburg, Germany ; BrainLinks-BrainTools Cluster of Excellence, University of Freiburg Freiburg, Germany
| | - Raymund A Roos
- Department of Neurology, Leiden University Medical Centre Leiden, Netherlands
| | - Alexandra Durr
- Department of Genetics and Cytogenetics, Pitié-Salpêtrière University Hospital Paris, France
| | - Blair R Leavitt
- Centre for Molecular Medicine and Therapeutics, Department of Medical Genetics, University of British Columbia Vancouver, Canada
| | - Sarah J Tabrizi
- Department of Neurodegenerative Disease, Institute of Neurology, University College London London, UK
| | - Stefan Klöppel
- Department of Psychiatry and Psychotherapy, University Medical Center Freiburg Freiburg, Germany ; Freiburg Brain Imaging Center, University Medical Center Freiburg Freiburg, Germany ; Department of Neurology, University Medical Center Freiburg Freiburg, Germany
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19
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Klöppel S, Gregory S, Scheller E, Minkova L, Razi A, Durr A, Roos RA, Leavitt BR, Papoutsi M, Landwehrmeyer GB, Reilmann R, Borowsky B, Johnson H, Mills JA, Owen G, Stout J, Scahill RI, Long JD, Rees G, Tabrizi SJ. Compensation in Preclinical Huntington's Disease: Evidence From the Track-On HD Study. EBioMedicine 2015; 2:1420-9. [PMID: 26629536 PMCID: PMC4634199 DOI: 10.1016/j.ebiom.2015.08.002] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 07/31/2015] [Accepted: 08/02/2015] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Cognitive and motor task performance in premanifest Huntington's disease (HD) gene-carriers is often within normal ranges prior to clinical diagnosis, despite loss of brain volume in regions involved in these tasks. This indicates ongoing compensation, with the brain maintaining function in the presence of neuronal loss. However, thus far, compensatory processes in HD have not been modeled explicitly. Using a new model, which incorporates individual variability related to structural change and behavior, we sought to identify functional correlates of compensation in premanifest-HD gene-carriers. METHODS We investigated the modulatory effects of regional brain atrophy, indexed by structural measures of disease load, on the relationship between performance and brain activity (or connectivity) using task-based and resting-state functional MRI. FINDINGS Consistent with compensation, as atrophy increased performance-related activity increased in the right parietal cortex during a working memory task. Similarly, increased functional coupling between the right dorsolateral prefrontal cortex and a left hemisphere network in the resting-state predicted better cognitive performance as atrophy increased. Such patterns were not detectable for the left hemisphere or for motor tasks. INTERPRETATION Our findings provide evidence for active compensatory processes in premanifest-HD for cognitive demands and suggest a higher vulnerability of the left hemisphere to the effects of regional atrophy.
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Affiliation(s)
- Stefan Klöppel
- Albert-Ludwigs-University Freiburg, University Medical Center, Division Freiburg Brain Imaging, Freiburg, Germany
- Albert-Ludwigs-University Freiburg, University Medical Center, Department of Psychiatry and Psychotherapy, Freiburg, Germany
- Albert-Ludwigs-University Freiburg, University Medical Center, Department of Neurology, Freiburg, Germany
| | - Sarah Gregory
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK
| | - Elisa Scheller
- Albert-Ludwigs-University Freiburg, University Medical Center, Division Freiburg Brain Imaging, Freiburg, Germany
- Albert-Ludwigs-University Freiburg, University Medical Center, Department of Psychiatry and Psychotherapy, Freiburg, Germany
- Albert-Ludwigs-University Freiburg, Department of Psychology, Laboratory for Biological and Personality Psychology, Freiburg, Germany
| | - Lora Minkova
- Albert-Ludwigs-University Freiburg, University Medical Center, Division Freiburg Brain Imaging, Freiburg, Germany
- Albert-Ludwigs-University Freiburg, University Medical Center, Department of Psychiatry and Psychotherapy, Freiburg, Germany
- Albert-Ludwigs-University Freiburg, Department of Psychology, Laboratory for Biological and Personality Psychology, Freiburg, Germany
| | - Adeel Razi
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK
- Department of Electronic Engineering, N.E.D University of Engineering & Technology, Karachi, Pakistan
| | - Alexandra Durr
- APHP Department of Genetics, Groupe Hospitalier Pitié-Salpêtrière, UPMC Université Paris VI UMR_S1127, Paris France
- Institut du Cerveau et de la Moelle, INSERM U1127, CNRS UMR7225, UPMC Université Paris VI UMR_S1127, Paris France
| | - Raymund A.C. Roos
- Leiden University Medical Center, Department of Neurology, Leiden, The Netherlands
| | - Blair R. Leavitt
- Centre for Molecular Medicine and Therapeutics, Department of Medical Genetics, University of British Columbia, Canada
| | - Marina Papoutsi
- Department of Neurodegenerative Disease, UCL Institute of Neurology, University College London, London, UK
| | | | - Ralf Reilmann
- George-Huntington-Institute, Muenster, Germany
- University of Tuebingen, Department of Neurodegenerative Diseases and Hertie-Institute for Clinical Brain Research, Tuebingen, Germany
| | | | - Hans Johnson
- Department of Electrical and Computer Engineering, University of Iowa, Iowa City, IA, USA
| | - James A. Mills
- Department of Psychiatry, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Gail Owen
- Department of Neurodegenerative Disease, UCL Institute of Neurology, University College London, London, UK
| | - Julie Stout
- School of Psychological Sciences and Institute of Clinical and Cognitive Neuroscience, Monash University, Melbourne, Australia
| | - Rachael I. Scahill
- Department of Neurodegenerative Disease, UCL Institute of Neurology, University College London, London, UK
| | - Jeffrey D. Long
- Department of Psychiatry, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
- Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, IA, USA
| | - Geraint Rees
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK
- Institute of Cognitive Neuroscience, University College London, London, UK
| | - Sarah J. Tabrizi
- Department of Neurodegenerative Disease, UCL Institute of Neurology, University College London, London, UK
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Klöppel S, Lauer E, Peter J, Minkova L, Nissen C, Normann C, Reis J, Mainberger F, Bach M, Lahr J. LTP-like plasticity in the visual system and in the motor system appear related in young and healthy subjects. Front Hum Neurosci 2015; 9:506. [PMID: 26441603 PMCID: PMC4585301 DOI: 10.3389/fnhum.2015.00506] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 08/31/2015] [Indexed: 01/12/2023] Open
Abstract
LTP-like plasticity measured by visual evoked potentials (VEP) can be induced in the intact human brain by presenting checkerboard reversals. Also associated with LTP-like plasticity, around two third of participants respond to transcranial magnetic stimulation (TMS) with a paired-associate stimulation (PAS) protocol with a potentiation of their motor evoked potentials. LTP-like processes are also required for verbal and motor learning tasks. We compared effect sizes, responder rates and intercorrelations as well as the potential influence of attention between these four assessments in a group of 37 young and healthy volunteers. We observed a potentiation effect of the N75 and P100 VEP component which positively correlated with plasticity induced by PAS. Subjects with a better subjective alertness were more likely to show PAS and VEP potentiation. No correlation was found between the other assessments. Effect sizes and responder rates of VEP potentiation were higher compared to PAS. Our results indicate a high variability of LTP-like effects and no evidence for a system-specific nature. As a consequence, studies wishing to assess individual levels of LTP-like plasticity should employ a combination of multiple assessments.
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Affiliation(s)
- Stefan Klöppel
- Center of Geriatrics and Gerontology Freiburg, University Medical Center Freiburg Freiburg, Germany ; Department of Neurology, Freiburg Brain Imaging, University Medical Center Freiburg Freiburg, Germany ; Department of Psychiatry and Psychotherapy, University Medical Center Freiburg Freiburg, Germany ; Department of Neurology, University Medical Center Freiburg Freiburg, Germany
| | - Eliza Lauer
- Department of Neurology, Freiburg Brain Imaging, University Medical Center Freiburg Freiburg, Germany
| | - Jessica Peter
- Department of Neurology, Freiburg Brain Imaging, University Medical Center Freiburg Freiburg, Germany ; Department of Psychiatry and Psychotherapy, University Medical Center Freiburg Freiburg, Germany ; Department of Neurology, University Medical Center Freiburg Freiburg, Germany
| | - Lora Minkova
- Department of Neurology, Freiburg Brain Imaging, University Medical Center Freiburg Freiburg, Germany ; Department of Psychiatry and Psychotherapy, University Medical Center Freiburg Freiburg, Germany ; Laboratory for Biological and Personality Psychology, Department of Psychology, University of Freiburg Freiburg, Germany
| | - Christoph Nissen
- Department of Psychiatry and Psychotherapy, University Medical Center Freiburg Freiburg, Germany
| | - Claus Normann
- Department of Psychiatry and Psychotherapy, University Medical Center Freiburg Freiburg, Germany
| | - Janine Reis
- Department of Neurology, University Medical Center Freiburg Freiburg, Germany
| | - Florian Mainberger
- Department of Psychiatry and Psychotherapy, University Medical Center Freiburg Freiburg, Germany ; Department of Pediatrics, Kinderzentrum München gGmbH, Technical University Munich Munich, Germany
| | - Michael Bach
- Eye Center, University Medical Center Freiburg Freiburg, Germany
| | - Jacob Lahr
- Department of Neurology, Freiburg Brain Imaging, University Medical Center Freiburg Freiburg, Germany ; Department of Psychiatry and Psychotherapy, University Medical Center Freiburg Freiburg, Germany ; Department of Neurology, University Medical Center Freiburg Freiburg, Germany
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Frings L, Hellwig S, Spehl TS, Bormann T, Buchert R, Vach W, Minkova L, Heimbach B, Klöppel S, Meyer PT. Asymmetries of amyloid-β burden and neuronal dysfunction are positively correlated in Alzheimer's disease. Brain 2015; 138:3089-99. [PMID: 26280595 DOI: 10.1093/brain/awv229] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 06/17/2015] [Indexed: 01/11/2023] Open
Abstract
Clinical Alzheimer's disease affects both cerebral hemispheres to a similar degree in clinically typical cases. However, in atypical variants like logopenic progressive aphasia, neurodegeneration often presents asymmetrically. Yet, no in vivo imaging study has investigated whether lateralized neurodegeneration corresponds to lateralized amyloid-β burden. Therefore, using combined (11)C-Pittsburgh compound B and (18)F-fluorodeoxyglucose positron emission tomography, we explored whether asymmetric amyloid-β deposition in Alzheimer's disease is associated with asymmetric hypometabolism and clinical symptoms. From our database of patients who underwent positron emission tomography with both (11)C-Pittsburgh compound B and (18)F-fluorodeoxyglucose (n = 132), we included all amyloid-positive patients with prodromal or mild-to-moderate Alzheimer's disease (n = 69). The relationship between (11)C-Pittsburgh compound B binding potential and (18)F-fluorodeoxyglucose uptake was assessed in atlas-based regions of interest covering the entire cerebral cortex. Lateralizations of amyloid-β and hypometabolism were tested for associations with each other and with type and severity of cognitive symptoms. Positive correlations between asymmetries of Pittsburgh compound B binding potential and hypometabolism were detected in 6 of 25 regions (angular gyrus, middle frontal gyrus, middle occipital gyrus, superior parietal gyrus, inferior and middle temporal gyrus), i.e. hypometabolism was more pronounced on the side of greater amyloid-β deposition (range: r = 0.41 to 0.53, all P < 0.001). Stronger leftward asymmetry of amyloid-β deposition was associated with more severe language impairment (P < 0.05), and stronger rightward asymmetry with more severe visuospatial impairment (at trend level, P = 0.073). Similarly, patients with predominance of language deficits showed more left-lateralized amyloid-β burden and hypometabolism than patients with predominant visuospatial impairment and vice versa in several cortical regions. Associations between amyloid-β deposition and hypometabolism or cognitive impairment were predominantly observed in brain regions with high amyloid-β load. The relationship between asymmetries of amyloid-β deposition and hypometabolism in cortical regions with high amyloid-β load is in line with the detrimental effect of amyloid-β burden on neuronal function. Asymmetries were also concordant with lateralized cognitive symptoms, indicating their clinical relevance.
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Affiliation(s)
- Lars Frings
- 1 Department of Nuclear Medicine, University Medical Centre, Freiburg, Germany 2 Centre of Geriatrics and Gerontology, University Medical Centre, Freiburg, Germany
| | - Sabine Hellwig
- 2 Centre of Geriatrics and Gerontology, University Medical Centre, Freiburg, Germany 3 Department of Psychiatry and Psychotherapy, University Medical Centre, Freiburg, Germany
| | - Timo S Spehl
- 1 Department of Nuclear Medicine, University Medical Centre, Freiburg, Germany
| | - Tobias Bormann
- 4 Department of Neurology, University Medical Centre, Freiburg, Germany
| | - Ralph Buchert
- 5 Department of Nuclear Medicine, Charité Universitätsmedizin Berlin, Germany
| | - Werner Vach
- 6 Centre for Medical Biometry and Medical Informatics, University Medical Centre, Freiburg, Germany
| | - Lora Minkova
- 3 Department of Psychiatry and Psychotherapy, University Medical Centre, Freiburg, Germany 7 Freiburg Brain Imaging, University Medical Centre Freiburg, Germany
| | - Bernhard Heimbach
- 2 Centre of Geriatrics and Gerontology, University Medical Centre, Freiburg, Germany
| | - Stefan Klöppel
- 2 Centre of Geriatrics and Gerontology, University Medical Centre, Freiburg, Germany 3 Department of Psychiatry and Psychotherapy, University Medical Centre, Freiburg, Germany 7 Freiburg Brain Imaging, University Medical Centre Freiburg, Germany
| | - Philipp T Meyer
- 1 Department of Nuclear Medicine, University Medical Centre, Freiburg, Germany
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Scheller E, Minkova L, Leitner M, Klöppel S. Attempted and successful compensation in preclinical and early manifest neurodegeneration - a review of task FMRI studies. Front Psychiatry 2014; 5:132. [PMID: 25324786 PMCID: PMC4179340 DOI: 10.3389/fpsyt.2014.00132] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 09/08/2014] [Indexed: 01/20/2023] Open
Abstract
Several models of neural compensation in healthy aging have been suggested to explain brain activity that aids to sustain cognitive function. Applying recently suggested criteria of "attempted" and "successful" compensation, we reviewed existing literature on compensatory mechanisms in preclinical Huntington's disease (HD) and amnestic mild cognitive impairment (aMCI). Both disorders constitute early stages of neurodegeneration ideal for examining compensatory mechanisms and developing targeted interventions. We strived to clarify whether compensation criteria derived from healthy aging populations can be applied to early neurodegeneration. To concentrate on the close coupling of cognitive performance and brain activity, we exclusively addressed task fMRI studies. First, we found evidence for parallels in compensatory mechanisms between healthy aging and neurodegenerative disease. Several studies fulfilled criteria of attempted compensation, while reports of successful compensation were largely absent, which made it difficult to conclude on. Second, comparing working memory studies in preclinical HD and aMCI, we identified similar compensatory patterns across neurodegenerative disorders in lateral and medial prefrontal cortex. Such patterns included an inverted U-shaped relationship of neurodegeneration and compensatory activity spanning from preclinical to manifest disease. Due to the lack of studies systematically targeting all criteria of compensation, we propose an exemplary study design, including the manipulation of compensating brain areas by brain stimulation. Furthermore, we delineate the benefits of targeted interventions by non-invasive brain stimulation, as well as of unspecific interventions such as physical activity or cognitive training. Unambiguously detecting compensation in early neurodegenerative disease will help tailor interventions aiming at sustained overall functioning and delayed clinical disease onset.
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Affiliation(s)
- Elisa Scheller
- Section of Gerontopsychiatry and Neuropsychology, Department of Psychiatry and Psychotherapy, University Medical Center Freiburg, Freiburg, Germany
- Freiburg Brain Imaging Center (FBI), University Medical Center Freiburg, Freiburg, Germany
- Laboratory for Biological and Personality Psychology, Department of Psychology, University of Freiburg, Freiburg, Germany
| | - Lora Minkova
- Section of Gerontopsychiatry and Neuropsychology, Department of Psychiatry and Psychotherapy, University Medical Center Freiburg, Freiburg, Germany
- Freiburg Brain Imaging Center (FBI), University Medical Center Freiburg, Freiburg, Germany
- Laboratory for Biological and Personality Psychology, Department of Psychology, University of Freiburg, Freiburg, Germany
| | - Mathias Leitner
- Section of Gerontopsychiatry and Neuropsychology, Department of Psychiatry and Psychotherapy, University Medical Center Freiburg, Freiburg, Germany
- Freiburg Brain Imaging Center (FBI), University Medical Center Freiburg, Freiburg, Germany
| | - Stefan Klöppel
- Section of Gerontopsychiatry and Neuropsychology, Department of Psychiatry and Psychotherapy, University Medical Center Freiburg, Freiburg, Germany
- Freiburg Brain Imaging Center (FBI), University Medical Center Freiburg, Freiburg, Germany
- Department of Neurology, University Medical Center Freiburg, Freiburg, Germany
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Peter J, Lahr J, Lauer E, Minkova L, Köstering L, Normann C, Nissen C, Reis J, Kaller C, Klöppel S. O3‐07‐06: LTP‐LIKE CORTICAL PLASTICITY IS ASSOCIATED WITH VERBAL LEARNING AND SLEEP QUALITY IN MILD COGNITIVE IMPAIRMENT. Alzheimers Dement 2014. [DOI: 10.1016/j.jalz.2014.04.310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
| | - Jacob Lahr
- University Medical Center FreiburgFreiburgGermany
| | - Eliza Lauer
- University Medical Center FreiburgFreiburgGermany
| | - Lora Minkova
- University Medical Center FreiburgFreiburgGermany
| | | | | | | | - Janine Reis
- University Medical Center FreiburgFreiburgGermany
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Minkova L, Filippi S. Polymer–Clay Nanocomposites Based on Blends of Various Types of Polyethylenes and PE-g-MA: Morphology, Thermal Properties, Microhardness, and Transparency. J MACROMOL SCI B 2010. [DOI: 10.1080/00222341003609856] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- L. Minkova
- a Institute of Polymers , Bulgarian Academy of Sciences , Sofia, Bulgaria
| | - S. Filippi
- b Department of Chemical Engineering , University of Pisa , Pisa, Italy
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Minkova L, Peneva Y, Valcheva M, Filippi S, Pracella M, Anguillesi I, Magagnini P. Morphology, microhardness, and flammability of compatibilized polyethylene/clay nanocomposites. POLYM ENG SCI 2010. [DOI: 10.1002/pen.21659] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Pandis C, Logakis E, Peoglos V, Pissis P, Omastová M, Mravčáková M, Janke A, Pionteck J, Peneva Y, Minkova L. Morphology, microhardness, and electrical properties of composites based on polypropylene, montmorillonite, and polypyrrole. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/polb.21646] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Affiliation(s)
- Y. Peneva
- a Institute of Polymers, Bulgarian Academy of Sciences , Acad. G. Bontchev Str. Bl. 103A, Sofia, 1113, Bulgaria
| | - M. Valcheva
- a Institute of Polymers, Bulgarian Academy of Sciences , Acad. G. Bontchev Str. Bl. 103A, Sofia, 1113, Bulgaria
| | - L. Minkova
- a Institute of Polymers, Bulgarian Academy of Sciences , Acad. G. Bontchev Str. Bl. 103A, Sofia, 1113, Bulgaria
| | - M. Mičušík
- b Polymer Institute, Slovak Academy of Sciences , Dúbravská cesta 9, 842 36, Bratislava, Slovakia
| | - M. Omastová
- b Polymer Institute, Slovak Academy of Sciences , Dúbravská cesta 9, 842 36, Bratislava, Slovakia
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Famulari A, Arosio P, Filippi S, Marazzato C, Magagnini P, Minkova L, Meille S. Clay‐induced Preferred Orientation in Polyethylene/Compatibilized Clay Nanocomposites. J MACROMOL SCI B 2007. [DOI: 10.1080/00222340601158225] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- A. Famulari
- a Dipartimento di Chimica , Materiali ed Ingegneria Chimica del Politecnico di Milano , Milano, Italy
| | - P. Arosio
- a Dipartimento di Chimica , Materiali ed Ingegneria Chimica del Politecnico di Milano , Milano, Italy
| | - S. Filippi
- b Dipartimento di Ingegneria Chimica , Chimica Industriale e Scienza dei Materiali dell'Università degli Studi di Pisa , Pisa, Italy
| | - C. Marazzato
- b Dipartimento di Ingegneria Chimica , Chimica Industriale e Scienza dei Materiali dell'Università degli Studi di Pisa , Pisa, Italy
| | - P. Magagnini
- b Dipartimento di Ingegneria Chimica , Chimica Industriale e Scienza dei Materiali dell'Università degli Studi di Pisa , Pisa, Italy
| | - L. Minkova
- c Institute of Polymers, Bulgarian Academy of Sciences , Sofia, Bulgaria
| | - S.V. Meille
- a Dipartimento di Chimica , Materiali ed Ingegneria Chimica del Politecnico di Milano , Milano, Italy
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Affiliation(s)
- L. Minkova
- a Central Laboratory for Polymers Bulgarian Academy of Science , Sofia, 1040, Bulgaria
| | - M. Nikolova
- b Scientific and Industrial Enterprise of Electron Processing of Materials , Sofia, 1324, Bulgaria
| | - E. Nedkov
- c Central Laboratory for Polymers Bulgarian Academy of Science , Sofia, 1040, Bulgaria
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Nikolova M, Minkova L, Nedkov E. WAXS and SAXS investigation of the supermolecular structure of LDPE films irradiated with fast electrons. J MACROMOL SCI B 2006. [DOI: 10.1080/00222348808212309] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- M. Nikolova
- a Scientific and Industrial Enterprise of Electron Processing of Materials , Sofia, 1324, Bulgaria
| | - L. Minkova
- b Central Laboratory for Polymers Bulgarian Academy of Sciences , Sofia, 1040, Bulgaria
| | - E. Nedkov
- b Central Laboratory for Polymers Bulgarian Academy of Sciences , Sofia, 1040, Bulgaria
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Nedkov E, Minkova L, Nikolova M. Conoscopic and X-ray diffraction study of the molecular and lamellar orientation in LDPE films. J MACROMOL SCI B 2006. [DOI: 10.1080/00222348708223948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- E. Nedkov
- a Central Laboratory for Polymers, Bulgarian Academy of Sciences , Sofia, 1040, Bulgaria
| | - L. Minkova
- a Central Laboratory for Polymers, Bulgarian Academy of Sciences , Sofia, 1040, Bulgaria
| | - M. Nikolova
- a Central Laboratory for Polymers, Bulgarian Academy of Sciences , Sofia, 1040, Bulgaria
- b Scientific and Industrial Enterprise of Electron Processing of Materials , Sofia, 1324, Bulgaria
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Minkova L, Magagnini PL. Banded texture in sheared a semiflexible thermotropic liquid-crystalline polyester and its graft copolymers with polyolefins. Colloid Polym Sci 2001. [DOI: 10.1007/s003960000403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Minkova L, Magagnini PL. Morphology and crystallization of blends of linear low density polyethylene with a semiflexible liquid crystalline polymer. Colloid Polym Sci 1996. [DOI: 10.1007/bf00658907] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Minkova L, Mihailov M. Kinetics of nonisothermal crystallization and melting of normal high density and ultra-high molecular weight polyethylene blends. Colloid Polym Sci 1989. [DOI: 10.1007/bf01410433] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Mihailov M, Minkova L. Pecularities of the thermomechanical behaviour of ultra-high molecular weight linear polyethylene and its blends with linear polyethylene of normal molecular weight. Colloid Polym Sci 1987. [DOI: 10.1007/bf01425029] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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