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Zhang S, Sala G, Nakamura A, Kato T, Furuya K, Shimokata H, Gao X, Nishita Y, Otsuka R. Associations of dietary patterns and longitudinal brain-volume change in Japanese community-dwelling adults: results from the national institute for longevity sciences-longitudinal study of aging. Nutr J 2024; 23:34. [PMID: 38468287 DOI: 10.1186/s12937-024-00935-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 02/28/2024] [Indexed: 03/13/2024] Open
Abstract
BACKGROUND The association of dietary patterns and longitudinal changes in brain volume has rarely been investigated in Japanese individuals. We prospectively investigated this association in middle-aged and older Japanese community-dwelling adults. METHODS Data with a 2-year follow-up from the sixth wave (July 2008 to July 2010; baseline) to the seventh (July 2010 to July 2012; follow-up) of the National Institute for Longevity Sciences-Longitudinal Study of Aging project were analyzed. Dietary intake was assessed using a 3-day dietary record, and longitudinal volume changes (%) in the total gray matter (TGM), total white matter, and frontal, parietal, occipital, temporal, and insular lobes were assessed using 3-dimensional T1 magnetic resonance imaging scans. Multiple factor analysis and hierarchical clustering revealed sex-specific dietary patterns. Associations between dietary patterns and annual brain-volume changes (%) were evaluated using general linear models adjusted for age, apoprotein E genotype, body mass index, medical history, lifestyle behaviors, socioeconomic factors, and energy intake. RESULTS Among the 1636 participants (age: 40.3-89.2 years), three dietary patterns were determined for men (n = 815; Western; Vegetable-Fruit-Dairy; and Traditional Japanese diets) and women (n = 821; Western; Grain-Vegetable-Fruit; and Traditional Japanese diets). Compared to women following the Western diet, those on the Traditional Japanese diet had less TGM atrophy. Multivariable-adjusted β (95% confidence interval) of the annual change (%) of TGM was - 0.145 (-0.287 to -0.002; P = 0.047), which correlated with reduced parietal lobe atrophy. No association between dietary pattern and brain atrophy was observed in men. CONCLUSIONS Adherence to healthy dietary patterns, with higher consumption of whole grains, seafood, vegetables, fruits, mushrooms, soybean products, and green tea, potentially confers a protective effect against brain atrophy in middle-aged and older Japanese women but not in men. Further research to confirm these results and ascertain the underlying mechanisms is required. This study highlights the importance of sex-specific effects on the relationship between dietary patterns and brain health in diverse populations.
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Affiliation(s)
- Shu Zhang
- Department of Epidemiology of Aging, National Center for Geriatrics and Gerontology, 7-430 Morioka-cho, Obu, 474-8511, Aichi, Japan
| | - Giovanni Sala
- Department of Psychology, University of Liverpool, Liverpool, Merseyside, UK
| | - Akinori Nakamura
- Department of Biomarker Research, National Center for Geriatrics and Gerontology, Obu, Aichi, Japan
| | - Takashi Kato
- Department of Clinical and Experimental Neuroimaging, National Center for Geriatrics and Gerontology, Obu, Aichi, Japan
| | - Kanae Furuya
- Department of Epidemiology of Aging, National Center for Geriatrics and Gerontology, 7-430 Morioka-cho, Obu, 474-8511, Aichi, Japan
| | - Hiroshi Shimokata
- Graduate School of Nutritional Sciences, Nagoya University of Arts and Sciences, Nisshin, Aichi, Japan
| | - Xiang Gao
- Department of Nutrition and Food Hygiene, Fudan University, Shanghai, People's Republic of China
| | - Yukiko Nishita
- Department of Epidemiology of Aging, National Center for Geriatrics and Gerontology, 7-430 Morioka-cho, Obu, 474-8511, Aichi, Japan
| | - Rei Otsuka
- Department of Epidemiology of Aging, National Center for Geriatrics and Gerontology, 7-430 Morioka-cho, Obu, 474-8511, Aichi, Japan.
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Maruszak A, Silajdžić E, Lee H, Murphy T, Liu B, Shi L, de Lucia C, Douiri A, Salta E, Nevado AJ, Teunissen CE, Visser PJ, Price J, Zetterberg H, Lovestone S, Thuret S. Predicting progression to Alzheimer's disease with human hippocampal progenitors exposed to serum. Brain 2023; 146:2045-2058. [PMID: 36703180 PMCID: PMC10151193 DOI: 10.1093/brain/awac472] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 10/11/2022] [Accepted: 11/10/2022] [Indexed: 01/28/2023] Open
Abstract
Adult hippocampal neurogenesis is important for learning and memory and is altered early in Alzheimer's disease. As hippocampal neurogenesis is modulated by the circulatory systemic environment, evaluating a proxy of how hippocampal neurogenesis is affected by the systemic milieu could serve as an early biomarker for Alzheimer's disease progression. Here, we used an in vitro assay to model the impact of systemic environment on hippocampal neurogenesis. A human hippocampal progenitor cell line was treated with longitudinal serum samples from individuals with mild cognitive impairment, who either progressed to Alzheimer's disease or remained cognitively stable. Mild cognitive impairment to Alzheimer's disease progression was characterized most prominently with decreased proliferation, increased cell death and increased neurogenesis. A subset of 'baseline' cellular readouts together with education level were able to predict Alzheimer's disease progression. The assay could provide a powerful platform for early prognosis, monitoring disease progression and further mechanistic studies.
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Affiliation(s)
- Aleksandra Maruszak
- Department of Basic and Clinical Neuroscience, Institute of Psychiatry Psychology & Neuroscience, King's College London, London, SE5 9RX, UK
| | - Edina Silajdžić
- Department of Basic and Clinical Neuroscience, Institute of Psychiatry Psychology & Neuroscience, King's College London, London, SE5 9RX, UK
| | - Hyunah Lee
- Department of Basic and Clinical Neuroscience, Institute of Psychiatry Psychology & Neuroscience, King's College London, London, SE5 9RX, UK
| | - Tytus Murphy
- Department of Basic and Clinical Neuroscience, Institute of Psychiatry Psychology & Neuroscience, King's College London, London, SE5 9RX, UK
| | - Benjamine Liu
- Department of Psychiatry, University of Oxford, Oxford, OX3 7JX, UK
| | - Liu Shi
- Department of Psychiatry, University of Oxford, Oxford, OX3 7JX, UK
| | - Chiara de Lucia
- Department of Basic and Clinical Neuroscience, Institute of Psychiatry Psychology & Neuroscience, King's College London, London, SE5 9RX, UK
| | - Abdel Douiri
- Department of Population Health Sciences, King's College London, London, SE1 1UL, UK
| | - Evgenia Salta
- Netherlands Institute for Neuroscience, 1105 BA Amsterdam, The Netherlands.,Neurochemistry Lab and Biobank, Department of Clinical Chemistry, Amsterdam Neuroscience, VU University Medical Center, 1007 MB Amsterdam, The Netherlands
| | - Alejo J Nevado
- Department of Psychiatry, University of Oxford, Oxford, OX3 7JX, UK
| | - Charlotte E Teunissen
- Neurochemistry Lab and Biobank, Department of Clinical Chemistry, Amsterdam Neuroscience, VU University Medical Center, 1007 MB Amsterdam, The Netherlands
| | - Pieter J Visser
- Department of Psychiatry and Neuropsychology, Alzheimer Center Limburg, School for Mental Health and Neuroscience, Maastricht University, 6200 MD Maastricht, The Netherlands.,Department of Neurology, Alzheimer Center, VU University Medical Center, 1081 HZ Amsterdam, The Netherlands
| | - Jack Price
- Department of Basic and Clinical Neuroscience, Institute of Psychiatry Psychology & Neuroscience, King's College London, London, SE5 9RX, UK
| | - Henrik Zetterberg
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, S-431 80 Mölndal, Sweden.,Department of Neurodegenerative Disease, UCL Institute of Neurology, London, WC1N 3BG, UK.,Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, the Sahlgrenska Academy at the University of Gothenburg, S-431 80 Mölndal, Sweden.,UK Dementia Research Institute at UCL, London, WC1E 6BT, UK
| | - Simon Lovestone
- Department of Psychiatry, University of Oxford, Oxford, OX3 7JX, UK.,Janssen Medical UK, B-2340 Beerse, Belgium
| | - Sandrine Thuret
- Department of Basic and Clinical Neuroscience, Institute of Psychiatry Psychology & Neuroscience, King's College London, London, SE5 9RX, UK
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3
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Sible IJ, Nation DA. Visit-to-Visit Blood Pressure Variability and Cognitive Decline in Apolipoprotein ɛ4 Carriers versus Apolipoprotein ɛ3 Homozygotes. J Alzheimers Dis 2023; 93:533-543. [PMID: 37066910 PMCID: PMC10852980 DOI: 10.3233/jad-221103] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
Abstract
BACKGROUND Blood pressure variability (BPV) is associated with cognitive decline and Alzheimer's disease (AD), but relationships with AD risk gene apolipoprotein (APOE) ɛ4 remain understudied. OBJECTIVE Examined the longitudinal relationship between BPV and cognitive change in APOE ɛ4 carriers and APOE ɛ3 homozygotes. METHODS 1,194 Alzheimer's Disease Neuroimaging Initiative participants (554 APOE ɛ4 carriers) underwent 3-4 blood pressure measurements between study baseline and 12-month follow-up. Visit-to-visit BPV was calculated as variability independent of mean over these 12 months. Participants subsequently underwent ≥1 neuropsychological exam at 12-month follow-up or later (up to 156 months later). Composite scores for the domains of memory, language, executive function, and visuospatial abilities were determined. Linear mixed models examined the 3-way interaction of BPV×APOE ɛ4 carrier status x time predicting change in composite scores. RESULTS Higher systolic BPV predicted greater decline in memory (+1 SD increase of BPV: β= -0.001, p < 0.001) and language (β= -0.002, p < 0.0001) among APOE ɛ4 carriers, but not APOE ɛ3 homozygotes (memory: +1 SD increase of BPV: β= 0.0001, p = 0.57; language: β= 0.0001, p = 0.72). Systolic BPV was not significantly associated with change in executive function or visuospatial abilities in APOE ɛ4 carriers (ps = 0.08-0.16) or APOE ɛ3 homozygotes (ps = 0.48-0.12). CONCLUSION Cognitive decline associated with high BPV may be specifically accelerated among APOE ɛ4 carriers.
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Affiliation(s)
- Isabel J. Sible
- Department of Psychology, University of Southern California, Los Angeles, CA 90007, USA
| | - Daniel A. Nation
- Institute for Memory Impairments and Neurological Disorders, University of California Irvine, Irvine, CA 92697, USA
- Department of Psychological Science, University of California Irvine, Irvine, CA 92697, USA
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Harnish SM, Diedrichs VA, Bartlett CW. EARLY CONSIDERATIONS OF GENETICS IN APHASIA REHABILITATION: A NARRATIVE REVIEW. APHASIOLOGY 2022; 37:835-853. [PMID: 37346093 PMCID: PMC10281715 DOI: 10.1080/02687038.2022.2043234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 02/14/2022] [Indexed: 06/23/2023]
Abstract
Background Early investigations linking language and genetics were focused on the evolution of human communication in populations with developmental speech and language disorders. Recently, studies suggest that genes may also modulate recovery from post-stroke aphasia. Aims Our goal is to review current literature related to the influence of genetics on post-stroke recovery, and the implications for aphasia rehabilitation. We describe candidate genes implicated by empirical findings and address additional clinical considerations. Main Contribution We describe existing evidence and mechanisms supporting future investigations into how genetic factors may modulate aphasia recovery and propose that two candidate genes, brain derived neurotrophic factor (BDNF) and apolipoprotein E (APOE), may be important considerations for future research assessing response to aphasia treatment. Evidence suggests that BDNF is important for learning, memory, and neuroplasticity. APOE influences cognitive functioning and memory in older individuals and has also been implicated in neural repair. Moreover, recent data suggest an interaction between specific alleles of the BDNF and APOE genes in influencing episodic memory. Conclusions Genetic influences on recovery from aphasia have been largely unexplored in the literature despite evidence that genetic factors influence behaviour and recovery from brain injury. As researchers continue to explore prognostic factors that may influence response to aphasia treatment, it is time for genetic factors to be considered as a source of variability. As the field moves in the direction of personalized medicine, eventually allied health professionals may utilize genetic profiles to inform treatment decisions and education for patients and care partners.
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Affiliation(s)
- Stacy M Harnish
- Department of Speech and Hearing Science, The Ohio State University
| | | | - Christopher W Bartlett
- Battelle Center for Mathematical Medicine, Abigail Wexner Research Institute at Nationwide Children's Hospital and Department of Pediatrics, College of Medicine, The Ohio State University
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5
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Blood pressure variability and medial temporal atrophy in apolipoprotein ϵ4 carriers. Brain Imaging Behav 2021; 16:792-801. [PMID: 34581957 PMCID: PMC9009865 DOI: 10.1007/s11682-021-00553-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/31/2021] [Indexed: 12/12/2022]
Abstract
Blood pressure variability is an emerging risk factor for dementia but relationships with markers of neurodegeneration and Alzheimer's disease risk are understudied. We investigated blood pressure variability over one year and follow-up medial temporal brain volume change in apolipoprotein ϵ4 carriers and non-carriers, and in those with and without Alzheimer's disease biomarker abnormality. 1051 Alzheimer's Disease Neuroimaging Initiative participants without history of dementia or stroke underwent 3-4 blood pressure measurements over 12 months and ≥ 1 MRI thereafter. A subset (n = 252) underwent lumbar puncture to determine Alzheimer's disease cerebral spinal fluid amyloid-beta and phosphorylated tau biomarker abnormality. Blood pressure variability over 12 months was calculated as variability independent of mean. Longitudinal hippocampal and entorhinal cortex volume data were extracted from serial brain MRI scans obtained after the final blood pressure measurement. Apolipoprotein ϵ4 carrier status was defined as at least one ϵ4 allele. Bayesian growth modelling revealed a significant interaction of blood pressure variability by ϵ4 by time on hippocampal (ß: -2.61 [95% credible interval -3.02, -2.12]) and entorhinal cortex (ß: -1.47 [95% credible interval -1.71, -1.17]) volume decline. A similar pattern emerged in subsets with Alzheimer's disease pathophysiology (i.e., abnormal levels of both amyloid-beta and phosphorylated tau). Findings suggest that elevated blood pressure variability is related to medial temporal volume loss specifically in ϵ4 carriers, and in those with Alzheimer's disease biomarker abnormality. Findings could implicate blood pressure variability in medial temporal neurodegeneration observed in older ϵ4 carriers and those with prodromal Alzheimer's disease.
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6
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Memel M, Staffaroni AM, Cobigo Y, Casaletto KB, Fonseca C, Bettcher BM, Yassa MA, Elahi FM, Wolf A, Rosen HJ, Kramer JH. APOE moderates the effect of hippocampal blood flow on memory pattern separation in clinically normal older adults. Hippocampus 2021; 31:845-857. [PMID: 33835624 PMCID: PMC8295213 DOI: 10.1002/hipo.23327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 01/25/2021] [Accepted: 03/07/2021] [Indexed: 11/10/2022]
Abstract
Pattern separation, the ability to differentiate new information from previously experienced similar information, is highly sensitive to hippocampal structure and function and declines with age. Functional MRI studies have demonstrated hippocampal hyperactivation in older adults compared to young, with greater task-related activation associated with worse pattern separation performance. The current study was designed to determine whether pattern separation was sensitive to differences in task-free hippocampal cerebral blood flow (CBF) in 130 functionally intact older adults. Given prior evidence that apolipoprotein E e4 (APOE e4) status moderates the relationship between CBF and episodic memory, we predicted a stronger negative relationship between hippocampal CBF and pattern separation in APOE e4 carriers. An interaction between APOE group and right hippocampal CBF was present, such that greater right hippocampal CBF was related to better lure discrimination in noncarriers, whereas the effect reversed directionality in e4 carriers. These findings suggest that neurovascular changes in the medial temporal lobe may underlie memory deficits in cognitively normal older adults who are APOE e4 carriers.
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Affiliation(s)
- Molly Memel
- San Francisco VA Medical Center, San Francisco, California
- Department of Neurology, Memory and Aging Center, University of California, San Francisco (UCSF), San Francisco, California
| | - Adam M. Staffaroni
- Department of Neurology, Memory and Aging Center, University of California, San Francisco (UCSF), San Francisco, California
| | - Yann Cobigo
- Department of Neurology, Memory and Aging Center, University of California, San Francisco (UCSF), San Francisco, California
| | - Kaitlin B. Casaletto
- Department of Neurology, Memory and Aging Center, University of California, San Francisco (UCSF), San Francisco, California
| | - Corrina Fonseca
- Department of Neurology, Memory and Aging Center, University of California, San Francisco (UCSF), San Francisco, California
| | - Brianne M. Bettcher
- Department of Neurology, University of Colorado Anschutz Medical Campus, CU Alzheimer’s and Cognition Center, Aurora, Colorado
| | - Michael A. Yassa
- Department of Neurobiology and Behavior and Center for the Neurobiology of Learning and Memory, University of California, Irvine, California
| | - Fanny M. Elahi
- Department of Neurology, Memory and Aging Center, University of California, San Francisco (UCSF), San Francisco, California
| | - Amy Wolf
- Department of Neurology, Memory and Aging Center, University of California, San Francisco (UCSF), San Francisco, California
| | - Howard J. Rosen
- Department of Neurology, Memory and Aging Center, University of California, San Francisco (UCSF), San Francisco, California
| | - Joel H. Kramer
- Department of Neurology, Memory and Aging Center, University of California, San Francisco (UCSF), San Francisco, California
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7
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Piersson AD, Mohamad M, Suppiah S, Rajab NF. Topographical patterns of whole-brain structural alterations in association with genetic risk, cerebrospinal fluid, positron emission tomography biomarkers of Alzheimer’s disease, and neuropsychological measures. Clin Transl Imaging 2021. [DOI: 10.1007/s40336-021-00440-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Zhang S, Otsuka R, Nishita Y, Nakamura A, Kato T, Iwata K, Tange C, Tomida M, Ando F, Shimokata H, Arai H. Green tea consumption is associated with annual changes in hippocampal volumes: A longitudinal study in community-dwelling middle-aged and older Japanese individuals. Arch Gerontol Geriatr 2021; 96:104454. [PMID: 34119808 DOI: 10.1016/j.archger.2021.104454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 05/26/2021] [Accepted: 05/29/2021] [Indexed: 10/21/2022]
Abstract
BACKGROUND To investigate the association between green tea consumption and the annual rate of change of gray matter (GM), white matter (WM), and hippocampal volumes in community-dwelling middle-aged and older Japanese individuals. METHODS A prospective cohort study with two years of follow-up was conducted as part of the National Institute for Longevity Sciences-Longitudinal Study of Aging (NILS-LSA) project. A total of 1693 participants (862 men and 831 women, aged 40-89 years) were included. Green tea consumption (mL/day) data were collected with a 3-day dietary record. Volumes of GM, WM, and the hippocampus were estimated by T1-weighted brain magnetic resonance imaging and FreeSurfer software. The GM ratio, WM ratio, and hippocampal ratio (HR) were calculated as the percentages of total intracranial volume, respectively. RESULTS The mean (SD) annual rate of change of hippocampal volume [(HR at baseline - HR at follow-up)/HR at baseline/follow-up years×100%] was 0.499 (1.128) (%). In the multivariable-adjusted general linear model, green tea consumption was negatively associated only with the annual rate of change of hippocampal volume (%) [β (95% CI) for each 1 mL/day increase in green tea consumption = -20.2E-5 (-35.0E-5 to -5.3E-5); P-value = 0.008]. No associations were observed for the annual rate of change of GM or WM volumes. The results remained significant when the analysis was limited to those with stable green tea consumption and were especially evident among individuals aged 65 years and older and among women. CONCLUSIONS In this study, higher green tea consumption was associated with less annual hippocampal atrophy, and each additional 100 mL/day of green tea intake was related to a reduction of approximately 5% in annual hippocampal atrophy. This association was especially evident among older individuals and among women. Further study in different settings is needed to confirm this association.
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Affiliation(s)
- Shu Zhang
- Department of Epidemiology of Aging, National Center for Geriatrics and Gerontology, Aichi, Japan
| | - Rei Otsuka
- Department of Epidemiology of Aging, National Center for Geriatrics and Gerontology, Aichi, Japan.
| | - Yukiko Nishita
- Department of Epidemiology of Aging, National Center for Geriatrics and Gerontology, Aichi, Japan
| | - Akinori Nakamura
- Department of Biomarker Research, National Center for Geriatrics and Gerontology, Aichi, Japan; Department of Clinical and Experimental Neuroimaging, National Center for Geriatrics and Gerontology, Aichi, Japan
| | - Takashi Kato
- Department of Clinical and Experimental Neuroimaging, National Center for Geriatrics and Gerontology, Aichi, Japan
| | - Kaori Iwata
- Department of Clinical and Experimental Neuroimaging, National Center for Geriatrics and Gerontology, Aichi, Japan
| | - Chikako Tange
- Department of Epidemiology of Aging, National Center for Geriatrics and Gerontology, Aichi, Japan
| | - Makiko Tomida
- Department of Epidemiology of Aging, National Center for Geriatrics and Gerontology, Aichi, Japan
| | - Fujiko Ando
- Department of Epidemiology of Aging, National Center for Geriatrics and Gerontology, Aichi, Japan; Faculty of Health and Medical Sciences, Aichi Shukutoku University, Aichi, Japan
| | - Hiroshi Shimokata
- Department of Epidemiology of Aging, National Center for Geriatrics and Gerontology, Aichi, Japan; Graduate School of Nutritional Sciences, Nagoya University of Arts and Sciences, Aichi, Japan
| | - Hidenori Arai
- National Center for Geriatrics and Gerontology, Aichi, Japan
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Stickel AM, McKinnon AC, Matijevic S, Grilli MD, Ruiz J, Ryan L. Apolipoprotein E ε4 Allele-Based Differences in Brain Volumes Are Largely Uniform Across Late Middle Aged and Older Hispanic/Latino- and Non-Hispanic/Latino Whites Without Dementia. Front Aging Neurosci 2021; 13:627322. [PMID: 33716715 PMCID: PMC7952627 DOI: 10.3389/fnagi.2021.627322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 02/01/2021] [Indexed: 12/01/2022] Open
Abstract
Hispanics/Latinos are at an equal or a greater risk for Alzheimer's disease (AD), yet risk factors remain more poorly characterized as compared to non-Hispanic/Latino Whites. Among non-Hispanic/Latino White cohorts, the apolipoprotein E (APOE) ε4 allele is one of the strongest risk factors for AD with subtle declines in episodic memory and brain volumes detectable in the preclinical stages. We examined whether the APOE ε4 status had a differential impact on cognition and brain volumes among cognitively healthy and mild cognitively impaired Hispanics/Latinos (n = 86; ε4 n = 23) compared to a well-matched group of non-Hispanic/Latino Whites (n = 92; ε4 n = 29). Neither the APOE ε4 status nor the interaction between the ε4 status and ethnicity was associated with cognitive performance. The APOE ε4 status was associated with white matter and not with gray matter volumes. APOE ε4 carriers had a significantly smaller total brain white matter volumes, as well as smaller right middle temporal and left superior temporal volumes. The Hispanics/Latinos had significantly smaller left middle frontal gray matter volumes, yet marginally larger overall white matter volumes, than the non-Hispanic/Latino Whites. Exploratory analysis within the Hispanic/Latino sample found that those people whose primary language was Spanish had larger total brain white matter volumes compared primarily to the English speakers. Importantly, primary language differences only held for Hispanic/Latino ε4 carriers and did not differentiate Hispanic/Latino non-carriers, underscoring the need for further investigation into the impacts of language and acculturation on cognitive aging among the fastest growing ethnic minority group in the United States.
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Affiliation(s)
- Ariana M. Stickel
- Department of Psychology, University of Arizona, Tucson, AZ, United States
- Department of Neurosciences, University of California, San Diego, La Jolla, CA, United States
| | - Andrew C. McKinnon
- Department of Psychology, University of Arizona, Tucson, AZ, United States
- Brain and Mind Centre, University of Sydney, Camperdown, NSW, Australia
| | | | - Matthew D. Grilli
- Department of Psychology, University of Arizona, Tucson, AZ, United States
| | - John Ruiz
- Department of Psychology, University of Arizona, Tucson, AZ, United States
| | - Lee Ryan
- Department of Psychology, University of Arizona, Tucson, AZ, United States
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10
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Van Etten EJ, Bharadwaj PK, Hishaw GA, Huentelman MJ, Trouard TP, Grilli MD, Alexander GE. Influence of regional white matter hyperintensity volume and apolipoprotein E ε4 status on hippocampal volume in healthy older adults. Hippocampus 2021; 31:469-480. [PMID: 33586848 PMCID: PMC9119498 DOI: 10.1002/hipo.23308] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 12/22/2020] [Accepted: 01/23/2021] [Indexed: 11/08/2022]
Abstract
While total white matter hyperintensity (WMH) volume on magnetic resonance imaging (MRI) has been associated with hippocampal atrophy, less is known about how the regional distribution of WMH volume may differentially affect the hippocampus in healthy aging. Additionally, apolipoprotein E (APOE) ε4 carriers may be at an increased risk for greater WMH volumes and hippocampal atrophy in aging. The present study sought to investigate whether regional WMH volume mediates the relationship between age and hippocampal volume and if this association is moderated by APOE ε4 status in a group of 190 cognitively healthy adults (APOE ε4 status [carrier/non-carrier] = 59/131), ages 50-89. Analyses revealed that temporal lobe WMH volume significantly mediated the relationship between age and average bilateral hippocampal volume, and this effect was moderated by APOE ε4 status (-0.020 (SE = 0.009), 95% CI, [-0.039, -0.003]). APOE ε4 carriers, but not non-carriers, showed negative indirect effects of age on hippocampal volume through temporal lobe WMH volume (APOE ε4 carriers: -0.016 (SE = 0.007), 95% CI, [-0.030, -0.003]; APOE ε4 non-carriers: .005 (SE = 0.006), 95% CI, [-0.006, 0.017]). These findings remained significant after additionally adjusting for sex, years of education, hypertension status and duration, cholesterol status, diabetes status, Body Mass Index, history of smoking, and the Wechsler Adult Intelligence Scale-IV Full Scale IQ. There were no significant moderated mediation effects for frontal, parietal, and occipital lobe WMH volumes, with or without covariates. Our findings indicate that in cognitively healthy older adults, elevated WMH volume regionally localized to the temporal lobes in APOE ε4 carriers is associated with reduced hippocampal volume, suggesting greater vulnerability to brain aging and the risk for Alzheimer's disease.
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Affiliation(s)
- Emily J Van Etten
- Department of Psychology, University of Arizona, Tucson, Arizona, USA.,Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, Arizona, USA
| | - Pradyumna K Bharadwaj
- Department of Psychology, University of Arizona, Tucson, Arizona, USA.,Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, Arizona, USA
| | - Georg A Hishaw
- Department of Neurology, University of Arizona, Tucson, Arizona, USA
| | - Matthew J Huentelman
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, Arizona, USA.,Neurogenomics Division, The Translational Genomics Research Institute (TGen), Phoenix, Arizona, USA.,Arizona Alzheimer's Consortium, Phoenix, Arizona, USA
| | - Theodore P Trouard
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, Arizona, USA.,Department of Biomedical Engineering, University of Arizona, Tucson, Arizona, USA.,Arizona Alzheimer's Consortium, Phoenix, Arizona, USA
| | - Matthew D Grilli
- Department of Psychology, University of Arizona, Tucson, Arizona, USA.,Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, Arizona, USA.,Department of Neurology, University of Arizona, Tucson, Arizona, USA
| | - Gene E Alexander
- Department of Psychology, University of Arizona, Tucson, Arizona, USA.,Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, Arizona, USA.,Department of Psychiatry, University of Arizona, Tucson, Arizona, USA.,Neuroscience Graduate Interdisciplinary Program, University of Arizona, Tucson, Arizona, USA.,Physiological Sciences Graduate Interdisciplinary Program, University of Arizona, Tucson, Arizona, USA.,Arizona Alzheimer's Consortium, Phoenix, Arizona, USA
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Hays CC, Zlatar ZZ, Meloy MJ, Bondi MW, Gilbert PE, Liu T, Helm JL, Wierenga CE. Interaction of APOE, cerebral blood flow, and cortical thickness in the entorhinal cortex predicts memory decline. Brain Imaging Behav 2021; 14:369-382. [PMID: 32048144 DOI: 10.1007/s11682-019-00245-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The ε4 allele of the apolipoprotein E (APOE) gene, a risk factor for cognitive decline, is associated with alterations in medial temporal lobe (MTL) structure and function, yet little research has been dedicated to understanding how these alterations might interact to negatively impact cognition. To bridge this gap, the present study employed linear regression models to determine the extent to which APOE genotype (ε4+, ε4-) modifies interactive effects of baseline arterial spin labeling MRI-measured cerebral blood flow (CBF) and FreeSurfer-derived cortical thickness/volume (CT/Vo) in two MTL regions of interest (entorhinal cortex, hippocampus) on memory change in 98 older adults who were cognitively normal at baseline. Baseline entorhinal CBF was positively associated with memory change, but only among ε4 carriers with lower entorhinal CT. Similarly, baseline entorhinal CT was positively associated with memory change, but only among ε4 carriers with lower entorhinal CBF. Findings suggest that APOE ε4 carriers may experience concomitant alterations in neurovascular function and morphology in the MTL that interact to negatively affect cognition prior to the onset of overt clinical symptoms. Results also suggest the presence of distinct multimodal neural signatures in the entorhinal cortex that may signal relative risk for cognitive decline among this group, perhaps reflecting different stages of cerebrovascular compensation (early effective vs. later ineffective).
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Affiliation(s)
- Chelsea C Hays
- VA San Diego Healthcare System, 3350 La Jolla Village Dr., MC 151B, San Diego, CA, 9216, USA.,SDSU/UCSD Joint Doctoral Program in Clinical Psychology, 6363 Alvarado Ct, Suite 103, San Diego, CA, 92120, USA
| | - Zvinka Z Zlatar
- Department of Psychiatry, UC San Diego, 9500 Gilman Dr., La Jolla, CA, 92093, USA
| | - M J Meloy
- VA San Diego Healthcare System, 3350 La Jolla Village Dr., MC 151B, San Diego, CA, 9216, USA.,Department of Psychiatry, UC San Diego, 9500 Gilman Dr., La Jolla, CA, 92093, USA
| | - Mark W Bondi
- VA San Diego Healthcare System, 3350 La Jolla Village Dr., MC 151B, San Diego, CA, 9216, USA.,SDSU/UCSD Joint Doctoral Program in Clinical Psychology, 6363 Alvarado Ct, Suite 103, San Diego, CA, 92120, USA.,Department of Psychiatry, UC San Diego, 9500 Gilman Dr., La Jolla, CA, 92093, USA
| | - Paul E Gilbert
- SDSU/UCSD Joint Doctoral Program in Clinical Psychology, 6363 Alvarado Ct, Suite 103, San Diego, CA, 92120, USA.,Department of Psychology, San Diego State University, 5500 Campanile Drive, San Diego, CA, 92182, USA
| | - Thomas Liu
- Department of Radiology, UC San Diego, 9500 Gilman Dr., La Jolla, CA, 92093, USA
| | - Jonathan L Helm
- SDSU/UCSD Joint Doctoral Program in Clinical Psychology, 6363 Alvarado Ct, Suite 103, San Diego, CA, 92120, USA.,Department of Psychology, San Diego State University, 5500 Campanile Drive, San Diego, CA, 92182, USA
| | - Christina E Wierenga
- VA San Diego Healthcare System, 3350 La Jolla Village Dr., MC 151B, San Diego, CA, 9216, USA. .,SDSU/UCSD Joint Doctoral Program in Clinical Psychology, 6363 Alvarado Ct, Suite 103, San Diego, CA, 92120, USA. .,Department of Psychiatry, UC San Diego, 9500 Gilman Dr., La Jolla, CA, 92093, USA.
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12
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Zhang T, Luo X, Zeng Q, Fu Y, Li Z, Li K, Liu X, Huang P, Chen Y, Zhang M, Liu Z. Effects of Smoking on Regional Homogeneity in Mild Cognitive Impairment: A Resting-State Functional MRI Study. Front Aging Neurosci 2020; 12:572732. [PMID: 33328955 PMCID: PMC7717978 DOI: 10.3389/fnagi.2020.572732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 10/13/2020] [Indexed: 01/06/2023] Open
Abstract
Background Smoking is a modifiable risk factor for Alzheimer’s disease (AD). However, smoking-related effects on intrinsic brain activity in high-risk AD population are still unclear. Objective We aimed to explore differences in smoking effects on brain function between healthy elderly and amnestic mild cognitive impairment (aMCI) patients using ReHo mapping. Methods We identified 64 healthy elderly controls and 116 aMCI patients, including 98 non-smoking and 18 smoking aMCI. Each subject underwent structural and resting-state functional MRI scanning and neuropsychological evaluations. Regional homogeneity (ReHo) mapping was used to assess regional brain synchronization. After correction for age, gender, education, and gray matter volume, we explored the difference of ReHo among groups in a voxel-wise way based on analysis of covariance (ANCOVA), followed by post hoc two-sample analyses (p < 0.05, corrected). Further, we correlated the mean ReHo with neuropsychological scales. Results Three groups were well-matched in age, gender, and education. Significant ReHo differences were found among three groups, located in the left supramarginal gyrus (SMG) and left angular gyrus (AG). Specifically, non-smoking aMCI had lower ReHo in SMG and AG than smoking aMCI and controls. By contrast, smoking aMCI had greater AG ReHo than healthy controls (p < 0.05). Across groups, correlation analyses showed that left AG ReHo correlated with MMSE (r = 0.18, p = 0.015), clock drawing test (r = 0.20, p = 0.007), immediate recall (r = 0.36, p < 0.001), delayed recall (r = 0.34, p < 0.001), and auditory verbal learning test (r = 0.20, p = 0.007). Conclusion Smoking might pose compensatory or protective effects on intrinsic brain activity in aMCI patients.
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Affiliation(s)
- Tianyi Zhang
- Department of Neurology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Xiao Luo
- Department of Radiology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Qingze Zeng
- Department of Radiology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Yanv Fu
- Department of Neurology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Zheyu Li
- Department of Neurology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Kaicheng Li
- Department of Radiology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Xiaocao Liu
- Department of Radiology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Peiyu Huang
- Department of Radiology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Yanxing Chen
- Department of Neurology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Minming Zhang
- Department of Radiology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Zhirong Liu
- Department of Neurology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
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13
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Werden E, Khlif MS, Bird LJ, Cumming T, Bradshaw J, Khan W, Pase M, Restrepo C, Veldsman M, Egorova N, Patel SK, Gottlieb E, Brodtmann A. APOE ɛ4 Carriers Show Delayed Recovery of Verbal Memory and Smaller Entorhinal Volume in the First Year After Ischemic Stroke. J Alzheimers Dis 2020; 71:245-259. [PMID: 31381519 DOI: 10.3233/jad-190566] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND The apolipoprotein E (APOE) gene ɛ4 allele is a risk factor for Alzheimer's disease and cardiovascular disease. However, its relationship with cognition and brain volume after stroke is not clear. OBJECTIVE We compared cognition and medial temporal lobe volumes in APOEɛ4 carriers and non-carriers in the first year after ischemic stroke. METHODS We sampled 20 APOEɛ4 carriers and 20 non-carriers from a larger cohort of 135 ischemic stroke participants in the longitudinal CANVAS study. Participants were matched on a range of demographic and stroke characteristics. We used linear mixed-effect models to compare cognitive domain z-scores (attention, processing speed, executive function, verbal and visual memory, language, visuospatial function) and regional medial temporal lobe volumes (hippocampal, entorhinal cortex) between groups at each time-point (3, 12-months post-stroke), and within groups across time-points. APOE gene single nucleotide polymorphisms (SNPs; rs7412, rs429358) were genotyped on venous blood. RESULTS APOEɛ4 carriers and non-carriers did not differ on any demographic, clinical, or stroke variable. Carriers performed worse than non-carriers in verbal memory at 3 months post-stroke (p = 0.046), but were better in executive function at 12 months (p = 0.035). Carriers demonstrated a significant improvement in verbal memory (p = 0.012) and executive function (p = 0.015) between time-points. Non-carriers demonstrated a significant improvement in visual memory (p = 0.0005). Carriers had smaller bilateral entorhinal cortex volumes (p < 0.05), and larger right sided and contralesional hippocampal volumes, at both time-points (p < 0.05). CONCLUSION APOE ɛ4 is associated with delayed recovery of verbal memory function and reduced entorhinal cortex volumes in the first year after ischemic stroke.
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Affiliation(s)
- Emilio Werden
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Mohamed Salah Khlif
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Laura J Bird
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Toby Cumming
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | | | - Wasim Khan
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Matthew Pase
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Carolina Restrepo
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Michele Veldsman
- Department of Experimental Psychology, University of Oxford, Oxford, UK
| | - Natalia Egorova
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia.,Melbourne School of Psychological Sciences, University of Melbourne, Melbourne, Australia
| | - Sheila K Patel
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Elie Gottlieb
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Amy Brodtmann
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia.,Austin Health, Heidelberg, Melbourne, VIC, Australia.,Eastern Clinical Research Unit, Box Hill Hospital, Melbourne, VIC, Australia
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14
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Chi CH, Chiu YS, Chang YL. Apolipoprotein E ε4 Allele Is Associated with Reduced Retention of the "Where" Memory Component in Cognitively Intact Older Adults. Arch Clin Neuropsychol 2020; 35:143-154. [PMID: 31701118 DOI: 10.1093/arclin/acz047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 05/03/2019] [Accepted: 08/19/2019] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVE The present study investigated the effect of the apolipoprotein E (ApoE) ε4 allele on the four memory components (i.e., who, when, where, and what) among cognitively intact older adults. METHODS Participants comprised 47 cognitively intact older adults, who were classified into 2 groups based on the presence or absence of at least 1 ApoE ε4 allele. All participants completed standardized neuropsychological tests, including the Logical Memory subtest of the Wechsler Memory Scale-III with a revised scoring method. RESULTS The results revealed that recollection for each component followed a pattern of who > what > when = where. Furthermore, a significant group-by-component-by-condition interaction indicated that the presence of the ApoE ε4 allele resulted in a disproportionately detrimental effect on the where component retention in the verbal episodic memory task; this finding was significantly correlated with hippocampal volumes. CONCLUSION These results highlighted the importance of evaluating the subcomponents of verbal episodic memory to detect subtle cognitive differences related to ApoE ε4 status, which could help elucidate the mechanism behind the cascades caused by ApoE ε4 in the trajectories of cognitive aging.
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Affiliation(s)
- Chia-Hsing Chi
- Department of Psychology, College of Science, National Taiwan University, Taipei 10617, Taiwan
| | - Yen-Shiang Chiu
- Department of Psychology, College of Science, National Taiwan University, Taipei 10617, Taiwan
| | - Yu-Ling Chang
- Department of Psychology, College of Science, National Taiwan University, Taipei 10617, Taiwan.,Neurobiology and Cognitive Science Center, National Taiwan University, Taipei 10617, Taiwan.,Center for Artificial Intelligence and Advanced Robotics, National Taiwan University, Taipei 10617, Taiwan.,Department of Neurology, National Taiwan University Hospital, Taipei 10048, Taiwan
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15
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APOE modifies the interaction of entorhinal cerebral blood flow and cortical thickness on memory function in cognitively normal older adults. Neuroimage 2019; 202:116162. [PMID: 31493534 DOI: 10.1016/j.neuroimage.2019.116162] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 08/14/2019] [Accepted: 09/03/2019] [Indexed: 11/20/2022] Open
Abstract
OBJECTIVE The ε4 allele of the apolipoprotein E (APOE) gene increases risk for cognitive decline in normal and pathologic aging. However, precisely how APOE ε4 exerts its negative impact on cognition is poorly understood. The present study aimed to determine whether APOE genotype (ε4+ vs. ε4-) modifies the interaction of medial temporal lobe (MTL) resting cerebral blood flow (CBF) and brain structure (cortical thickness [CT], volume [Vo]) on verbal memory performance. METHODS Multiple linear regression models were employed to investigate relationships between APOE genotype, arterial spin labeling MRI-measured CBF and FreeSurfer-based CT and Vo in four MTL regions of interest (left and right entorhinal cortex and hippocampus), and verbal memory performance among a sample of 117 cognitively normal older adults (41 ε4+, 76 ε4-) between the ages of 64 and 89 (mean age = 73). RESULTS Results indicated that APOE genotype modified the interaction of CBF and CT on memory in the left entorhinal cortex, such that the relationship between entorhinal CBF and memory was negative (lower CBF was associated with better memory) in non-carriers with higher entorhinal CT, positive (higher CBF was associated with better memory) in non-carriers with lower entorhinal CT, and negative (higher CBF was associated with worse memory) in ε4 carriers with lower entorhinal CT. CONCLUSIONS Findings suggest that older adult APOE ε4 carriers may experience vascular dysregulation and concomitant morphological alterations in the MTL that interact to negatively affect memory even in the absence overt clinical symptoms, providing potential insight into the mechanistic link between APOE ε4 and detriments in cognition. Moreover, findings suggest a distinct multimodal neural signature in ε4 carriers (higher CBF and lower CT in the entorhinal cortex) that could aid in the identification of candidates for future clinical trials aimed at preventing or slowing cognitive decline. Differential findings with respect to ε4 carriers and non-carriers are discussed in the context of neurovascular compensation.
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16
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Female mice with apolipoprotein E4 domain interaction demonstrated impairments in spatial learning and memory performance and disruption of hippocampal cyto-architecture. Neurobiol Learn Mem 2019; 161:106-114. [PMID: 30954674 DOI: 10.1016/j.nlm.2019.03.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 03/01/2019] [Accepted: 03/29/2019] [Indexed: 11/22/2022]
Abstract
We have previously reported cognitive impairments in both young and old mice, particularly in female mice expressing mouse Arg-61 apoE, with a point mutation to mimic the domain interaction feature of human apoE4, as compared to the wildtype mouse (C57BL/6J) apoE. In this study, we further evaluated water maze performance in the female Arg-61 mice at an additional time point and then investigated related hippocampal cyto-architecture in these young female Arg-61 apoE mice vs. the wildtype mice. The results of behavioral performance consistently support our previous report that the young female Arg-61 apoE showed cognitive impairment versus C57BL/6J at the same age. The cyto-architectural results showed that volume of the granular cell layer (GCL) was significantly larger in both 5- and 10-month old Arg-61 apoE mice versus C57BL/6J mice. While the number of newborn calretinin-positive neurons was greater in the sub-granular zone (SGZ) in 5-month old Arg-61 mice, this number dropped significantly in 10-month old Arg-61 mice to a lower level than in age-matched C57BL/6J mice. In addition, the amyloid β species was significantly higher in 5-month old Arg-61 mice versus age-matched C57BL/6J mice. In conclusion, impaired cognitive functions in female Arg-61 apoE mice appear correlated with larger GCL volume and higher calretinin-positive cell number and suggest a compensatory cellular response that may be related to amyloid beta perturbations early in life. Therefore this study suggests a novel cyto-architectural mechanism of apoE4-dependent pathologies and increased susceptibility of APOEε4 subjects to Alzheimer's disease.
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17
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Squarzoni P, Duran FLS, Busatto GF, Alves TCTDF. Reduced Gray Matter Volume of the Thalamus and Hippocampal Region in Elderly Healthy Adults with no Impact of APOE ɛ4: A Longitudinal Voxel-Based Morphometry Study. J Alzheimers Dis 2019; 62:757-771. [PMID: 29480170 DOI: 10.3233/jad-161036] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Many cross-sectional voxel-based morphometry (VBM) investigations have shown significant inverse correlations between chronological age and gray matter (GM) volume in several brain regions in healthy humans. However, few VBM studies have documented GM decrements in the healthy elderly with repeated MRI measurements obtained in the same subjects. Also, the extent to which the APOE ɛ4 allele influences longitudinal findings of GM reduction in the healthy elderly is unclear. OBJECTIVE Verify whether regional GM changes are associated with significant decrements in cognitive performance taking in account the presence of the APOE ɛ4 allele. METHODS Using structural MRI datasets acquired in 55 cognitively intact elderly subjects at two time-points separated by approximately three years, we searched for voxels showing significant GM reductions taking into account differences in APOE genotype. RESULTS We found global GM reductions as well as regional GM decrements in the right thalamus and left parahippocampal gyrus (p < 0.05, family-wise error corrected for multiple comparisons over the whole brain). These findings were not affected by APOE ɛ4. CONCLUSIONS Irrespective of APOE ɛ4, longitudinal VBM analyses show that the hippocampal region and thalamus are critical sites where GM shrinkage is greater than the degree of global volume reduction in healthy elderly subjects.
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Affiliation(s)
- Paula Squarzoni
- Department of Psychiatry, Laboratory of Psychiatric Neuroimaging (LIM 21), Faculty of Medicine, University of São Paulo, São Paulo, Brazil.,Núcleo de Apoio à Pesquisa em Neurociência Aplicada (NAPNA), University of São Paulo, São Paulo, Brazil
| | - Fabio Luis Souza Duran
- Department of Psychiatry, Laboratory of Psychiatric Neuroimaging (LIM 21), Faculty of Medicine, University of São Paulo, São Paulo, Brazil.,Núcleo de Apoio à Pesquisa em Neurociência Aplicada (NAPNA), University of São Paulo, São Paulo, Brazil
| | - Geraldo F Busatto
- Department of Psychiatry, Laboratory of Psychiatric Neuroimaging (LIM 21), Faculty of Medicine, University of São Paulo, São Paulo, Brazil.,Núcleo de Apoio à Pesquisa em Neurociência Aplicada (NAPNA), University of São Paulo, São Paulo, Brazil
| | - Tania Correa Toledo de Ferraz Alves
- Department of Psychiatry, Laboratory of Psychiatric Neuroimaging (LIM 21), Faculty of Medicine, University of São Paulo, São Paulo, Brazil.,Núcleo de Apoio à Pesquisa em Neurociência Aplicada (NAPNA), University of São Paulo, São Paulo, Brazil
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19
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Intrinsic functional connectivity alterations in cognitively intact elderly APOE ε4 carriers measured by eigenvector centrality mapping are related to cognition and CSF biomarkers: a preliminary study. Brain Imaging Behav 2018; 11:1290-1301. [PMID: 27714554 DOI: 10.1007/s11682-016-9600-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Apolipoprotein E (APOE) ε4 allele is the best established genetic risk factor for sporadic Alzheimer's disease (AD). However, there is a need to understand the effects of this genotype on the brain by simultaneously assessing intrinsic brain network and cerebral spinal fluid (CSF) biomarkers changes in healthy older ε4 carriers. Thirteen cognitively intact, elderly APOE ε4 carriers and 22 ε3 homozygotes were included in the present study. Eigenvector centrality mapping (ECM) was used to identify brain network hub organization based on resting-state functional MRI (rsfMRI). We evaluated comprehensive cognitive ability and tested levels of Aβ1-42, total-tau (t-tau) and phosphorylated-tau (p-tau181) in CSF. Comparisons of ECM between two groups were conducted, followed by correlations analyses between EC values with significant group differences and cognitive ability/CSF biomarkers. APOE ε4 carriers showed significantly decreased EC values in left medial temporal lobe (MTL), left lingual gyrus (LG) and increased EC values in left middle frontal gyrus (MFG) as compared to non-carriers. Correlation analysis demonstrated that left LG EC value correlated with Rey Auditory Verbal Learning Test total learning (RAVLT, r = 0.57, p < 0.05) and t-tau level (r = -0.57, p < 0.05), while left MFG EC values correlated with log-transformed Trail-Making Test B (TMT-B, r = -0.67, p < 0.05) in APOE ε4 carriers. This study suggests the APOE ε4 allele contributes to disruption of brain connectedness in certain functional nodes, which may result from neuronal death caused by toxicity of neurofibrillary tangles.
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20
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Haring B, Omidpanah A, Suchy-Dicey AM, Best LG, Verney SP, Shibata DK, Cole SA, Ali T, Howard BV, Buchwald D, Devereux RB. Left Ventricular Mass, Brain Magnetic Resonance Imaging, and Cognitive Performance: Results From the Strong Heart Study. Hypertension 2017; 70:964-971. [PMID: 28893898 DOI: 10.1161/hypertensionaha.117.09807] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 06/15/2017] [Accepted: 08/18/2017] [Indexed: 01/14/2023]
Abstract
Left ventricular mass (LVM) has been shown to serve as a measure of target organ damage resulting from chronic exposure to several risk factors. Data on the association of midlife LVM with later cognitive performance are sparse. We studied 721 adults (mean age 56 years at baseline) enrolled in the Strong Heart Study (SHS, 1993-1995) and the ancillary CDCAI (Cerebrovascular Disease and Its Consequences in American Indians) Study (2010-2013), a study population with high prevalence of cardiovascular disease. LVM was assessed with transthoracic echocardiography at baseline in 1993 to 1995. Cranial magnetic resonance imaging and cognitive testing were undertaken between 2010 and 2013. Generalized estimating equations were used to model associations between LVM and later imaging and cognition outcomes. The mean follow-up period was 17 years. A difference of 25 g in higher LVM was associated with marginally lower hippocampal volume (0.01%; 95% confidence interval, 0.02-0.00; P=0.001) and higher white matter grade (0.10; 95% confidence interval, 0.02-0.18; P=0.014). Functionally, participants with higher LVM tended to have slightly lower scores on the modified mini-mental state examination (0.58; 95% confidence interval, 1.08-0.08; P=0.024). The main results persisted after adjusting for blood pressure levels or vascular disease. The small overall effect sizes are partly explained by survival bias because of the high prevalence of cardiovascular disease in our population. Our findings emphasize the role of cardiovascular health in midlife as a target for the prevention of deleterious cognitive and functional outcomes in later life.
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Affiliation(s)
- Bernhard Haring
- Department of Medicine I, Comprehensive Heart Failure Center, University of Würzburg, Bavaria, Germany (B.V.H.); Initiative for Research and Education to Advance Community Health, Washington State University, Seattle (A.O., A.M.S.-D.); Missouri Breaks Industries Research Inc, Eagle Butte, SD (L.G.B.); Department of Psychology and Psychology Clinical Neuroscience Center, University of New Mexico, Albuquerque (S.P.V.); Department of Radiology, School of Medicine, University of Washington, Seattle (D.K.S.); Department of Genetics, Texas Biomedical Research Institute, San Antonio (S.A.C.); Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma, Health Sciences Center (T.A.); MedStar Health Research Institute, Hyattsville, MD (B.V.H.); Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (D.B.); and Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY (R.B.D.).
| | - Adam Omidpanah
- Department of Medicine I, Comprehensive Heart Failure Center, University of Würzburg, Bavaria, Germany (B.V.H.); Initiative for Research and Education to Advance Community Health, Washington State University, Seattle (A.O., A.M.S.-D.); Missouri Breaks Industries Research Inc, Eagle Butte, SD (L.G.B.); Department of Psychology and Psychology Clinical Neuroscience Center, University of New Mexico, Albuquerque (S.P.V.); Department of Radiology, School of Medicine, University of Washington, Seattle (D.K.S.); Department of Genetics, Texas Biomedical Research Institute, San Antonio (S.A.C.); Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma, Health Sciences Center (T.A.); MedStar Health Research Institute, Hyattsville, MD (B.V.H.); Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (D.B.); and Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY (R.B.D.)
| | - Astrid M Suchy-Dicey
- Department of Medicine I, Comprehensive Heart Failure Center, University of Würzburg, Bavaria, Germany (B.V.H.); Initiative for Research and Education to Advance Community Health, Washington State University, Seattle (A.O., A.M.S.-D.); Missouri Breaks Industries Research Inc, Eagle Butte, SD (L.G.B.); Department of Psychology and Psychology Clinical Neuroscience Center, University of New Mexico, Albuquerque (S.P.V.); Department of Radiology, School of Medicine, University of Washington, Seattle (D.K.S.); Department of Genetics, Texas Biomedical Research Institute, San Antonio (S.A.C.); Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma, Health Sciences Center (T.A.); MedStar Health Research Institute, Hyattsville, MD (B.V.H.); Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (D.B.); and Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY (R.B.D.)
| | - Lyle G Best
- Department of Medicine I, Comprehensive Heart Failure Center, University of Würzburg, Bavaria, Germany (B.V.H.); Initiative for Research and Education to Advance Community Health, Washington State University, Seattle (A.O., A.M.S.-D.); Missouri Breaks Industries Research Inc, Eagle Butte, SD (L.G.B.); Department of Psychology and Psychology Clinical Neuroscience Center, University of New Mexico, Albuquerque (S.P.V.); Department of Radiology, School of Medicine, University of Washington, Seattle (D.K.S.); Department of Genetics, Texas Biomedical Research Institute, San Antonio (S.A.C.); Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma, Health Sciences Center (T.A.); MedStar Health Research Institute, Hyattsville, MD (B.V.H.); Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (D.B.); and Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY (R.B.D.)
| | - Steven P Verney
- Department of Medicine I, Comprehensive Heart Failure Center, University of Würzburg, Bavaria, Germany (B.V.H.); Initiative for Research and Education to Advance Community Health, Washington State University, Seattle (A.O., A.M.S.-D.); Missouri Breaks Industries Research Inc, Eagle Butte, SD (L.G.B.); Department of Psychology and Psychology Clinical Neuroscience Center, University of New Mexico, Albuquerque (S.P.V.); Department of Radiology, School of Medicine, University of Washington, Seattle (D.K.S.); Department of Genetics, Texas Biomedical Research Institute, San Antonio (S.A.C.); Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma, Health Sciences Center (T.A.); MedStar Health Research Institute, Hyattsville, MD (B.V.H.); Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (D.B.); and Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY (R.B.D.)
| | - Dean K Shibata
- Department of Medicine I, Comprehensive Heart Failure Center, University of Würzburg, Bavaria, Germany (B.V.H.); Initiative for Research and Education to Advance Community Health, Washington State University, Seattle (A.O., A.M.S.-D.); Missouri Breaks Industries Research Inc, Eagle Butte, SD (L.G.B.); Department of Psychology and Psychology Clinical Neuroscience Center, University of New Mexico, Albuquerque (S.P.V.); Department of Radiology, School of Medicine, University of Washington, Seattle (D.K.S.); Department of Genetics, Texas Biomedical Research Institute, San Antonio (S.A.C.); Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma, Health Sciences Center (T.A.); MedStar Health Research Institute, Hyattsville, MD (B.V.H.); Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (D.B.); and Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY (R.B.D.)
| | - Shelley A Cole
- Department of Medicine I, Comprehensive Heart Failure Center, University of Würzburg, Bavaria, Germany (B.V.H.); Initiative for Research and Education to Advance Community Health, Washington State University, Seattle (A.O., A.M.S.-D.); Missouri Breaks Industries Research Inc, Eagle Butte, SD (L.G.B.); Department of Psychology and Psychology Clinical Neuroscience Center, University of New Mexico, Albuquerque (S.P.V.); Department of Radiology, School of Medicine, University of Washington, Seattle (D.K.S.); Department of Genetics, Texas Biomedical Research Institute, San Antonio (S.A.C.); Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma, Health Sciences Center (T.A.); MedStar Health Research Institute, Hyattsville, MD (B.V.H.); Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (D.B.); and Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY (R.B.D.)
| | - Tauqeer Ali
- Department of Medicine I, Comprehensive Heart Failure Center, University of Würzburg, Bavaria, Germany (B.V.H.); Initiative for Research and Education to Advance Community Health, Washington State University, Seattle (A.O., A.M.S.-D.); Missouri Breaks Industries Research Inc, Eagle Butte, SD (L.G.B.); Department of Psychology and Psychology Clinical Neuroscience Center, University of New Mexico, Albuquerque (S.P.V.); Department of Radiology, School of Medicine, University of Washington, Seattle (D.K.S.); Department of Genetics, Texas Biomedical Research Institute, San Antonio (S.A.C.); Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma, Health Sciences Center (T.A.); MedStar Health Research Institute, Hyattsville, MD (B.V.H.); Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (D.B.); and Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY (R.B.D.)
| | - Barbara V Howard
- Department of Medicine I, Comprehensive Heart Failure Center, University of Würzburg, Bavaria, Germany (B.V.H.); Initiative for Research and Education to Advance Community Health, Washington State University, Seattle (A.O., A.M.S.-D.); Missouri Breaks Industries Research Inc, Eagle Butte, SD (L.G.B.); Department of Psychology and Psychology Clinical Neuroscience Center, University of New Mexico, Albuquerque (S.P.V.); Department of Radiology, School of Medicine, University of Washington, Seattle (D.K.S.); Department of Genetics, Texas Biomedical Research Institute, San Antonio (S.A.C.); Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma, Health Sciences Center (T.A.); MedStar Health Research Institute, Hyattsville, MD (B.V.H.); Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (D.B.); and Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY (R.B.D.)
| | - Dedra Buchwald
- Department of Medicine I, Comprehensive Heart Failure Center, University of Würzburg, Bavaria, Germany (B.V.H.); Initiative for Research and Education to Advance Community Health, Washington State University, Seattle (A.O., A.M.S.-D.); Missouri Breaks Industries Research Inc, Eagle Butte, SD (L.G.B.); Department of Psychology and Psychology Clinical Neuroscience Center, University of New Mexico, Albuquerque (S.P.V.); Department of Radiology, School of Medicine, University of Washington, Seattle (D.K.S.); Department of Genetics, Texas Biomedical Research Institute, San Antonio (S.A.C.); Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma, Health Sciences Center (T.A.); MedStar Health Research Institute, Hyattsville, MD (B.V.H.); Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (D.B.); and Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY (R.B.D.)
| | - Richard B Devereux
- Department of Medicine I, Comprehensive Heart Failure Center, University of Würzburg, Bavaria, Germany (B.V.H.); Initiative for Research and Education to Advance Community Health, Washington State University, Seattle (A.O., A.M.S.-D.); Missouri Breaks Industries Research Inc, Eagle Butte, SD (L.G.B.); Department of Psychology and Psychology Clinical Neuroscience Center, University of New Mexico, Albuquerque (S.P.V.); Department of Radiology, School of Medicine, University of Washington, Seattle (D.K.S.); Department of Genetics, Texas Biomedical Research Institute, San Antonio (S.A.C.); Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma, Health Sciences Center (T.A.); MedStar Health Research Institute, Hyattsville, MD (B.V.H.); Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (D.B.); and Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY (R.B.D.)
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Associations between APOE polymorphisms and seven diseases with cognitive impairment including Alzheimer's disease, frontotemporal dementia, and dementia with Lewy bodies in southeast China. Psychiatr Genet 2017; 26:124-31. [PMID: 26981880 PMCID: PMC4890824 DOI: 10.1097/ypg.0000000000000126] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Supplemental Digital Content is available in the text. Objective To explore the effect of APOE polymorphisms on patients with cognitive impairments in The Chinese Han population. Materials and methods A total of 1027 cases with Alzheimer’s disease (AD), 40 cases with vascular dementia (VaD), 28 cases with behavioral variant frontotemporal dementia (bvFTD), 54 cases with semantic dementia (SD), 44 cases with dementia with Lewy bodies (DLB), 583 cases with mild cognitive impairment (MCI), and 32 cases with vascular cognitive impairment no dementia (VCIND) were recruited consecutively from memory disorders clinics in Huashan Hospital between January 2010 and December 2014. The 1149 cognitively normal controls were recruited from the community epidemiologic investigations. The APOE genotypes were determined using the TaqMan assay. Results The distribution of genotype and allele frequencies of APOE differed significantly between control and AD or MCI, with ε4 increasing the risk of AD and MCI in a dose-dependent pattern and ε2 decreasing the risk of AD, but not the risk of MCI. As for VaD, significant differences in the APOE genotype distribution were found compared with the controls. E4/4 increased the risk of VaD and ε4 increased the risk of VCIND in women. The allele distribution differed between bvFTD and controls, but genotype and allele frequencies of APOE did not affect the risk of bvFTD, SD, and DLB. Conclusion In The Chinese Han population, APOE ε4 increased the risk of AD and MCI in a dose-dependent manner and ε2 decreased the risk of AD as reported previously. APOEε4 might increase risk in VaD and female patients with VCIND, but no effects of APOE on bvFTD, DLB, and SD were found.
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22
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Reiter K, Nielson KA, Durgerian S, Woodard JL, Smith JC, Seidenberg M, Kelly DA, Rao SM. Five-Year Longitudinal Brain Volume Change in Healthy Elders at Genetic Risk for Alzheimer's Disease. J Alzheimers Dis 2017; 55:1363-1377. [PMID: 27834774 PMCID: PMC5924681 DOI: 10.3233/jad-160504] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Neuropathological changes associated with Alzheimer's disease (AD) precede symptom onset by more than a decade. Possession of an apolipoprotein E (APOE) ɛ4 allele is the strongest genetic risk factor for late onset AD. Cross-sectional studies of cognitively intact elders have noted smaller hippocampal/medial temporal volumes in ɛ4 carriers (ɛ4+) compared to ɛ4 non-carriers (ɛ4-). Few studies, however, have examined long-term, longitudinal, anatomical brain changes comparing healthy ɛ4+ and ɛ4- individuals. The current five-year study examined global and regional volumes of cortical and subcortical grey and white matter and ventricular size in 42 ɛ4+ and 30 ɛ4- individuals. Cognitively intact participants, ages 65-85 at study entry, underwent repeat anatomical MRI scans on three occasions: baseline, 1.5, and 4.75 years. Results indicated no between-group volumetric differences at baseline. Over the follow-up interval, the ɛ4+ group experienced a greater rate of volume loss in total grey matter, bilateral hippocampi, right hippocampal subfields, bilateral lingual gyri, bilateral parahippocampal gyri, and right lateral orbitofrontal cortex compared to the ɛ4- group. Greater loss in grey matter volumes in ɛ4+ participants were accompanied by greater increases in lateral, third, and fourth ventricular volumes. Rate of change in white matter volumes did not differentiate the groups. The current results indicate that longitudinal measurements of brain atrophy can serve as a sensitive biomarker for identifying neuropathological changes in persons at genetic risk for AD and potentially, for assessing the efficacy of treatments designed to slow or prevent disease progression during the preclinical stage of AD.
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Affiliation(s)
| | - Kristy A. Nielson
- Department of Psychology, Marquette University
- Department of Neurology, Medical College of Wisconsin
| | | | | | - J. Carson Smith
- Department of Kinesiology, School of Public Health, University of Maryland
| | | | - Dana A. Kelly
- Department of Psychology, Rosalind Franklin University
| | - Stephen M. Rao
- Schey Center for Cognitive Neuroimaging, Lou Ruvo Center for Brain Health, Neurological Institute, Cleveland Clinic
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23
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Dowell NG, Evans SL, Tofts PS, King SL, Tabet N, Rusted JM. Structural and resting-state MRI detects regional brain differences in young and mid-age healthy APOE-e4 carriers compared with non-APOE-e4 carriers. NMR IN BIOMEDICINE 2016; 29:614-624. [PMID: 26929040 DOI: 10.1002/nbm.3502] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 01/11/2016] [Accepted: 01/26/2016] [Indexed: 06/05/2023]
Abstract
The presence of the e4 allele of the apolipoprotein E (APOE) gene is the best-known genetic risk factor for Alzheimer's disease. In this study, we investigated the link between functional and behavioural differences and regional brain volume and cortical thickness differences in those who carry the e4 allele (e4+) and those who only carry the e3 allele (e3/e3). We studied these genotype populations in two age groups: a young group (average age, 21 years) and a mid-age group (average age, 50 years). High-resolution T1 -weighted MRI scans were analysed with Freesurfer to measure regional white matter brain volume and cortical thickness differences between genotype groups at each age. These data were correlated with behavioural findings in the same cohort. Resting-state MRI was also conducted to identify differences in underlying brain functional connectivity. We found that there was a positive correlation between the thickness of the parahippocampal cortex in young e4+ individuals and performance on an episodic memory task. Young e4+ individuals also showed a positive correlation between white matter volume in the left anterior cingulate and performance on a covert attention task. At mid-age, e4+ individuals had structural differences relative to e3/e3 individuals in these areas: the parahippocampal cortex was thicker and white matter volume in the left anterior cingulate was greater than in e3/e3 individuals. We discuss the possibility that an over-engagement with these regions by e4+ individuals in youth may have a neurogenic effect that is observable later in life. The cuneus appears to be an important region for APOE-driven differences in the brain, with greater functional connectivity among young e3/e3 individuals and greater white matter volume in young e4+ individuals.
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Affiliation(s)
| | - Simon L Evans
- School of Psychology, University of Sussex, Brighton, UK
| | - Paul S Tofts
- Brighton and Sussex Medical School, Brighton, UK
| | - Sarah L King
- School of Psychology, University of Sussex, Brighton, UK
| | - Naji Tabet
- Brighton and Sussex Medical School, Brighton, UK
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Harrison TM, Mahmood Z, Lau EP, Karacozoff AM, Burggren AC, Small GW, Bookheimer SY. An Alzheimer's Disease Genetic Risk Score Predicts Longitudinal Thinning of Hippocampal Complex Subregions in Healthy Older Adults. eNeuro 2016; 3:ENEURO.0098-16.2016. [PMID: 27482534 PMCID: PMC4945997 DOI: 10.1523/eneuro.0098-16.2016] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 06/08/2016] [Accepted: 06/13/2016] [Indexed: 01/30/2023] Open
Abstract
Variants at 21 genetic loci have been associated with an increased risk for Alzheimer's disease (AD). An important unresolved question is whether multiple genetic risk factors can be combined to increase the power to detect changes in neuroimaging biomarkers for AD. We acquired high-resolution structural images of the hippocampus in 66 healthy, older human subjects. For 45 of these subjects, longitudinal 2-year follow-up data were also available. We calculated an additive AD genetic risk score for each participant and contrasted this with a weighted risk score (WRS) approach. Each score included APOE (apolipoprotein E), CLU (clusterin), PICALM (phosphatidylinositol binding clathrin assembly protein), and family history of AD. Both unweighted risk score (URS) and WRS correlated strongly with the percentage change in thickness across the whole hippocampal complex (URS: r = -0.40; p = 0.003; WRS: r = -0.25, p = 0.048), driven by a strong relationship to entorhinal cortex thinning (URS: r = -0.35; p = 0.009; WRS: r = -0.35, p = 0.009). By contrast, at baseline the risk scores showed no relationship to thickness in any hippocampal complex subregion. These results provide compelling evidence that polygenic AD risk scores may be especially sensitive to structural change over time in regions affected early in AD, like the hippocampus and adjacent entorhinal cortex. This work also supports the paradigm of studying genetic risk for disease in healthy volunteers. Together, these findings will inform clinical trial design by supporting the idea that genetic prescreening in healthy control subjects can be useful to maximize the ability to detect an effect on a longitudinal neuroimaging endpoint, like hippocampal complex cortical thickness.
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Affiliation(s)
- Theresa M. Harrison
- Neuroscience Interdepartmental Graduate Program, University of California, Los Angeles, Los Angeles, California 90095
- Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, California 90095
| | - Zanjbeel Mahmood
- Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, California 90095
| | - Edward P. Lau
- Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, California 90095
| | - Alexandra M. Karacozoff
- Staglin IMHRO Center for Cognitive Neuroscience, University of California, Los Angeles, Los Angeles, California 90095
| | - Alison C. Burggren
- Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, California 90095
| | - Gary W. Small
- Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, California 90095
- Semel Institute for Neuroscience and Human Behaviors, University of California, Los Angeles, Los Angeles, California 90095
- UCLA Longevity Center, University of California, Los Angeles, Los Angeles, California 90095
| | - Susan Y. Bookheimer
- Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, California 90095
- Staglin IMHRO Center for Cognitive Neuroscience, University of California, Los Angeles, Los Angeles, California 90095
- Semel Institute for Neuroscience and Human Behaviors, University of California, Los Angeles, Los Angeles, California 90095
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25
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Vemuri P, Lesnick TG, Przybelski SA, Knopman DS, Machulda M, Lowe VJ, Mielke MM, Roberts RO, Gunter JL, Senjem ML, Geda YE, Rocca WA, Petersen RC, Jack CR. Effect of intellectual enrichment on AD biomarker trajectories: Longitudinal imaging study. Neurology 2016; 86:1128-35. [PMID: 26911640 PMCID: PMC4820132 DOI: 10.1212/wnl.0000000000002490] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 11/25/2015] [Indexed: 11/20/2022] Open
Abstract
Objective: To investigate the effect of age, sex, APOE4 genotype, and lifestyle enrichment (education/occupation, midlife cognitive activity, and midlife physical activity) on Alzheimer disease (AD) biomarker trajectories using longitudinal imaging data (brain β-amyloid load via Pittsburgh compound B PET and neurodegeneration via 18fluorodeoxyglucose (FDG) PET and structural MRI) in an elderly population without dementia. Methods: In the population-based longitudinal Mayo Clinic Study of Aging, we studied 393 participants without dementia (340 clinically normal, 53 mild cognitive impairment; 70 years and older) who had cognitive and physical activity measures and at least 2 visits with imaging biomarkers. We dichotomized participants into high (≥14 years) and low (<14 years) education levels using the median. For the entire cohort and the 2 education strata, we built linear mixed models to investigate the effect of the predictors on each of the biomarker outcomes. Results: Age was associated with amyloid and neurodegeneration trajectories; APOE4 status appears to influence only the amyloid and FDG trajectories but not hippocampal volume trajectory. In the high-education stratum, high midlife cognitive activity was associated with lower amyloid deposition in APOE4 carriers. APOE4 status was associated with lower FDG uptake in the entire cohort and in participants with lower education but not the high-education cohort. Conclusions: There were minimal effects of lifestyle enrichment on AD biomarker trajectories (specifically rates). Lifetime intellectual enrichment (high education, high midlife cognitive activity) is associated with lower amyloid in APOE4 carriers. High education is protective from the APOE4 effect on FDG metabolism. Differing education levels may explain the conflicting results seen in the literature.
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Affiliation(s)
- Prashanthi Vemuri
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ.
| | - Timothy G Lesnick
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - Scott A Przybelski
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - David S Knopman
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - Mary Machulda
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - Val J Lowe
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - Michelle M Mielke
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - Rosebud O Roberts
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - Jeffrey L Gunter
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - Matthew L Senjem
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - Yonas E Geda
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - Walter A Rocca
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - Ronald C Petersen
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
| | - Clifford R Jack
- From the Departments of Radiology (P.V., V.J.L., J.L.G., M.L.S., C.R.J.), Health Sciences Research (T.G.L., S.A.P., M.M.M., R.O.R., W.A.R.), Neurology (D.S.K., M.M.M., R.O.R., W.A.R., R.C.P.), and Psychology (M.M., Y.E.G.), Mayo Clinic, Rochester, MN; and Departments of Psychiatry (Y.E.G.) and Neurology (Y.E.G.), Mayo Clinic, Scottsdale, AZ
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Luo X, Qiu T, Xu X, Huang P, Gu Q, Shen Z, Yu X, Jia Y, Guan X, Song R, Zhang M. Decreased Inter-Hemispheric Functional Connectivity in Cognitively Intact Elderly APOE ɛ4 Carriers: A Preliminary Study. J Alzheimers Dis 2016; 50:1137-48. [DOI: 10.3233/jad-150989] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Ten Kate M, Sanz-Arigita EJ, Tijms BM, Wink AM, Clerigue M, Garcia-Sebastian M, Izagirre A, Ecay-Torres M, Estanga A, Villanua J, Vrenken H, Visser PJ, Martinez-Lage P, Barkhof F. Impact of APOE-ɛ4 and family history of dementia on gray matter atrophy in cognitively healthy middle-aged adults. Neurobiol Aging 2015; 38:14-20. [PMID: 26827639 DOI: 10.1016/j.neurobiolaging.2015.10.018] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 10/19/2015] [Accepted: 10/23/2015] [Indexed: 10/22/2022]
Abstract
The apolipoprotein E ε4 allele (APOE4) and family history of dementia (FH) are well-known risk factors for the development of sporadic Alzheimer's disease. We assessed the effects of these risk factors on gray matter (GM) volume in 295 cognitively healthy middle-aged community-dwelling subjects. Voxel-based morphometry was used to study GM volume differences between high- and low-risk subjects, based on APOE4 carriership (n = 74), first-degree FH (n = 228), or both (n = 62). No significant results were found using a corrected p value. Using a more lenient threshold (p < 0.001 and minimum cluster size of 100 voxels), APOE4 carriers had reduced GM in the striatum compared to noncarriers. Subjects with FH had reduced GM in right precuneus compared to subjects without FH. Maternal and paternal FH provided similar atrophy patterns. APOE4 carriers with FH had GM reductions in bilateral insula compared to subjects with neither APOE4 nor FH. We conclude that a family history of dementia and APOE4 carriership are both associated with regional GM decreases in cognitively healthy middle-aged subjects, with differential effects on brain regions typically affected in Alzheimer's disease.
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Affiliation(s)
- Mara Ten Kate
- Alzheimer Center and Department of Neurology, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, the Netherlands.
| | | | - Betty M Tijms
- Alzheimer Center and Department of Neurology, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, the Netherlands
| | - Alle Meije Wink
- Department of Radiology and Nuclear Medicine, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, the Netherlands
| | | | | | - Andrea Izagirre
- Department of Neurology, CITA-Alzheimer Foundation, San Sebastian, Spain
| | - Miriam Ecay-Torres
- Department of Neurology, CITA-Alzheimer Foundation, San Sebastian, Spain
| | - Ainara Estanga
- Department of Neurology, CITA-Alzheimer Foundation, San Sebastian, Spain
| | - Jorge Villanua
- Neuroimaging Department, CITA-Alzheimer Foundation, San Sebastian, Spain; Donostia Unit, Osatek SA, Donostia Univeristy Hospital, San Sebastian, Spain
| | - Hugo Vrenken
- Department of Radiology and Nuclear Medicine, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, the Netherlands
| | - Pieter Jelle Visser
- Alzheimer Center and Department of Neurology, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, the Netherlands; Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience, Maastricht University, Maastricht, the Netherlands
| | | | - Frederik Barkhof
- Department of Radiology and Nuclear Medicine, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, the Netherlands
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Sheppard DP, Graves LV, Holden HM, Delano-Wood L, Bondi MW, Gilbert PE. Spatial pattern separation differences in older adult carriers and non-carriers for the apolipoprotein E epsilon 4 allele. Neurobiol Learn Mem 2015; 129:113-9. [PMID: 25957133 DOI: 10.1016/j.nlm.2015.04.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 04/13/2015] [Accepted: 04/23/2015] [Indexed: 12/24/2022]
Abstract
We examined the performance of healthy young (n=57) and older adults (n=43) genotyped as apolipoprotein E-ε4 (APOE-ε4) carriers or APOE-ε4 non-carriers on a delayed match-to-sample task involving varying degrees of spatial interference hypothesized to assess spatial pattern separation. Older adult ε4 carriers were further divided into "impaired" and "unimpaired" groups based on their performance on a standardized test of verbal memory. We found that performance on the spatial pattern separation test increased as a function of decreased spatial interference across all groups. The older ε4 carriers in the impaired group performed significantly worse (p<.05) than unimpaired ε4 carriers, ε4 non-carriers, and young adults. The data suggest that spatial pattern separation may be less efficient in a subset of healthy older adults with subtle memory decline who are carriers of the ε4 allele. However, pattern separation performance may be comparable to that of young adults in a subset of older adult ε4 carriers and more broadly among non-carriers. Our findings offer additional evidence that pattern separation may vary in older adults, and they provide novel insight into pattern separation efficiency in ε4-positive older adults.
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Affiliation(s)
- David P Sheppard
- Department of Psychology, San Diego State University, San Diego, CA, USA; Department of Psychology, University of Houston, Houston, TX, USA.
| | - Lisa V Graves
- San Diego State University/University of California San Diego Joint Doctoral Program in Clinical Psychology, San Diego, CA, USA.
| | - Heather M Holden
- San Diego State University/University of California San Diego Joint Doctoral Program in Clinical Psychology, San Diego, CA, USA.
| | - Lisa Delano-Wood
- VA San Diego Healthcare System, La Jolla, CA, USA; Department of Psychiatry, University of California San Diego, School of Medicine, La Jolla, CA, USA.
| | - Mark W Bondi
- VA San Diego Healthcare System, La Jolla, CA, USA; Department of Psychiatry, University of California San Diego, School of Medicine, La Jolla, CA, USA.
| | - Paul E Gilbert
- Department of Psychology, San Diego State University, San Diego, CA, USA; San Diego State University/University of California San Diego Joint Doctoral Program in Clinical Psychology, San Diego, CA, USA.
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29
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Jak AJ, Panizzon MS, Spoon KM, Fennema-Notestine C, Franz CE, Thompson WK, Jacobson KC, Xian H, Eyler LT, Vuoksimaa E, Toomey R, Lyons MJ, Neale MC, Tsuang MT, Dale AM, Kremen WS. Hippocampal atrophy varies by neuropsychologically defined MCI among men in their 50s. Am J Geriatr Psychiatry 2015; 23:456-65. [PMID: 25306196 PMCID: PMC4345132 DOI: 10.1016/j.jagp.2014.08.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 08/06/2014] [Accepted: 08/12/2014] [Indexed: 01/31/2023]
Abstract
OBJECTIVE In an effort to address earliest detection of mild cognitive impairment (MCI), we examined hippocampal volumes and atrophy in middle-aged men to explore neuroanatomical support for different neuropsychological definitions of MCI. METHODS 460 men aged 51-60 years underwent neuropsychological testing and MRI. MCI was defined according to five criteria sets. MRI-derived hippocampal volume and hippocampal occupancy (HOC) were obtained via FreeSurfer. Statistical analyses were performed using linear mixed models. RESULTS Differences in HOC between normal cognitive functioning, amnestic, and non-amnestic MCI were observed using MCI criteria that required one impaired (>1.5 SD) cognitive measure in a given cognitive domain or a cognitive composite score method with a cut-point 2 SD below the mean. Differences in standard hippocampal volume were only found between normal and amnestic presentations and only when using the composite score method. CONCLUSION Results provide empirical support for detection of pre-MCI in younger cohorts. Convergence of neuropsychological and neuroanatomical data, particularly HOC (as opposed to standard cross-sectional volume), supports early identification of MCI as defined by some neuropsychological criteria.
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Affiliation(s)
- Amy J. Jak
- Psychology Service, VA San Diego Healthcare System, 3350 La Jolla Village Dr., La Jolla, CA, 92161, USA
,Center of Excellence for Stress and Mental Health, VA San Diego Healthcare System, 3350 La Jolla Village Dr., La Jolla, CA, 92161, USA
,Department of Psychiatry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
| | - Matthew S. Panizzon
- Department of Psychiatry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
,Twin Research Laboratory, Center for Behavioral Genomics, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
| | - Kelly M. Spoon
- Department of Psychiatry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
,Twin Research Laboratory, Center for Behavioral Genomics, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
,Computational Science Research Center, San Diego State University/Claremont Graduate University, 5500 Campanile Drive, San Diego, CA 92182-1245, USA
| | - Christine Fennema-Notestine
- Department of Psychiatry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
,Department of Radiology, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Carol E. Franz
- Department of Psychiatry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
,Twin Research Laboratory, Center for Behavioral Genomics, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
| | - Wesley, K. Thompson
- Department of Psychiatry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
,Twin Research Laboratory, Center for Behavioral Genomics, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
| | - Kristen C. Jacobson
- Department of Psychiatry and Behavioral Neuroscience, University of Chicago, 5841 S. Maryland Ave., Chicago, IL 60637, USA
| | - Hong Xian
- Department of Biostatistics, Saint Louis University School of Public Health, 3545 Lafayette Avenue, St. Louis, MO 63104, USA
,VA St. Louis Healthcare System, 915 North Grand Blvd., St. Louis, MO 63106, USA
| | - Lisa T. Eyler
- Psychology Service, VA San Diego Healthcare System, 3350 La Jolla Village Dr., La Jolla, CA, 92161, USA
,Department of Psychiatry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
| | - Eero Vuoksimaa
- Department of Psychiatry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
,Twin Research Laboratory, Center for Behavioral Genomics, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
,Department of Public Health, University of Helsinki, PO Box 41 (Mannerheimintie 172) FI-00014, Helsinki, Finland and the Academy of Finland
| | - Rosemary Toomey
- Department of Psychology, Boston University, 64 Cummington Mall, Boston, MA 02215, USA
| | - Michael J. Lyons
- Department of Psychology, Boston University, 64 Cummington Mall, Boston, MA 02215, USA
| | - Michael C. Neale
- Departments of Psychiatry and Human and Molecular Genetics, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Ming T. Tsuang
- Center of Excellence for Stress and Mental Health, VA San Diego Healthcare System, 3350 La Jolla Village Dr., La Jolla, CA, 92161, USA
,Department of Psychiatry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
,Twin Research Laboratory, Center for Behavioral Genomics, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
| | - Anders M. Dale
- Department of Radiology, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
,Department of Neurosciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - William S. Kremen
- Center of Excellence for Stress and Mental Health, VA San Diego Healthcare System, 3350 La Jolla Village Dr., La Jolla, CA, 92161, USA
,Department of Psychiatry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
,Twin Research Laboratory, Center for Behavioral Genomics, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA
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30
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Insights into cognitive aging and Alzheimer’s disease using amyloid PET and structural MRI scans. Clin Transl Imaging 2015. [DOI: 10.1007/s40336-015-0110-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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31
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Mather KA, Armstrong NJ, Wen W, Kwok JB, Assareh AA, Thalamuthu A, Reppermund S, Duesing K, Wright MJ, Ames D, Trollor JN, Brodaty H, Schofield PR, Sachdev PS. Investigating the genetics of hippocampal volume in older adults without dementia. PLoS One 2015; 10:e0116920. [PMID: 25625606 PMCID: PMC4308067 DOI: 10.1371/journal.pone.0116920] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 12/16/2014] [Indexed: 11/19/2022] Open
Abstract
Hippocampal atrophy is observed with ageing and age-related neurodegenerative disease. Identification of the genetic correlates of hippocampal volume (HV) and atrophy may assist in elucidating the mechanisms of ageing and age-related neurodegeneration. Using two community cohorts of older Caucasians we estimated the heritability of HV and examined associations of HV with previously identified single nucleotide polymorphisms (SNPs). In addition we undertook genome-association studies (GWAS) examining HV and HV atrophy. Participants were community-dwelling non-demented older adults from the longitudinal Sydney Memory and Ageing Study (Sydney MAS) (N = 498) and the Older Australian Twins Study (OATS) (N = 351) aged 65 and over. HV was measured using T1-weighted magnetic resonance images. Heritability of HV was estimated in OATS. Genome-wide genotyping was imputed using the 1K Genomes reference set. Associations with HV-candidate and Alzheimer’s disease (AD)-related SNPs were investigated. A GWAS examining HV (in both cohorts) and an exploratory GWAS of HV atrophy over two years (in Sydney MAS only) were also undertaken. HV heritability was estimated at 62–65%. The previously identified GWAS HV SNP (rs6581612) and the candidate BDNF SNP (rs6265) were nominally significant (p = 0.047 and p = 0.041 respectively). No AD-related SNPs, including the APOE ε4 polymorphism, were significant. No significant results were observed for either of the GWAS undertaken. Despite our estimate of a high heritability of HV, our results are consistent with a highly polygenic model suggesting that SNPs identified from prior studies, including GWAS meta-analyses, can be difficult to replicate in smaller samples of older adults.
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Affiliation(s)
- Karen A. Mather
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales (UNSW), Sydney, Australia
- * E-mail:
| | - Nicola J. Armstrong
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales (UNSW), Sydney, Australia
- School of Mathematics and Statistics, University of Sydney, Sydney, Australia
- School of Mathematics and Statistics, UNSW, Sydney, Australia
| | - Wei Wen
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales (UNSW), Sydney, Australia
| | - John B. Kwok
- Neuroscience Research Australia, Sydney, Australia
- School of Medical Sciences, UNSW, Sydney, Australia
| | - Amelia A. Assareh
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales (UNSW), Sydney, Australia
| | - Anbupalam Thalamuthu
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales (UNSW), Sydney, Australia
| | - Simone Reppermund
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales (UNSW), Sydney, Australia
| | - Konsta Duesing
- The Commonwealth Scientific and Industrial Research Organisation (CSIRO) Animal Food and Health Sciences Division, Sydney, Australia
| | | | - David Ames
- National Ageing Research Institute, Royal Melbourne Hospital, Melbourne, Australia
- Academic Unit for Psychiatry of Old Age, University of Melbourne, Melbourne, Australia
| | - Julian N. Trollor
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales (UNSW), Sydney, Australia
- Department of Developmental Disability Neuropsychiatry, UNSW, Sydney, Australia
| | - Henry Brodaty
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales (UNSW), Sydney, Australia
- Primary Dementia Collaborative Research Centre, UNSW, Sydney, Australia
| | - Peter R. Schofield
- Neuroscience Research Australia, Sydney, Australia
- School of Medical Sciences, UNSW, Sydney, Australia
| | - Perminder S. Sachdev
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales (UNSW), Sydney, Australia
- Neuropsychiatric Institute, Prince of Wales Hospital, Sydney, Australia
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32
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Teng E, Chow N, Hwang KS, Thompson PM, Gylys KH, Cole GM, Jack CR, Shaw LM, Trojanowski JQ, Soares HD, Weiner MW, Apostolova LG. Low plasma ApoE levels are associated with smaller hippocampal size in the Alzheimer's disease neuroimaging initiative cohort. Dement Geriatr Cogn Disord 2014; 39:154-66. [PMID: 25547651 PMCID: PMC4323932 DOI: 10.1159/000368982] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/10/2014] [Indexed: 12/22/2022] Open
Abstract
Apolipoprotein E (APOE) genotype is the strongest known genetic risk factor for sporadic Alzheimer's disease (AD), but the utility of plasma ApoE levels for assessing the severity of underlying neurodegenerative changes remains uncertain. Here, we examined cross-sectional associations between plasma ApoE levels and volumetric magnetic resonance imaging indices of the hippocampus from 541 participants [57 with normal cognition (NC), 375 with mild cognitive impairment (MCI), and 109 with mild AD] who were enrolled in the Alzheimer's Disease Neuroimaging Initiative. Across the NC and MCI groups, lower plasma ApoE levels were significantly correlated with smaller hippocampal size, as measured by either hippocampal volume or hippocampal radial distance. These associations were driven primarily by findings from carriers of an APOE ε4 allele and are consistent with prior reports that lower plasma ApoE levels correlate with greater global cortical Pittsburgh Compound B retention. In this high-risk group, plasma ApoE levels may represent a peripheral marker of underlying AD neuropathology in nondemented elderly individuals.
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Affiliation(s)
- Edmond Teng
- Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, CA, USA
| | - Nicole Chow
- Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Imaging Genetics Center, Laboratory of Neuro Imaging, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Kristy S. Hwang
- Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Imaging Genetics Center, Laboratory of Neuro Imaging, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Paul M. Thompson
- Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Imaging Genetics Center, Laboratory of Neuro Imaging, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
- Department of Psychiatry and Biobehavioral Sciences, Semel Institute, David Geffen School of Medicine, UCLA, CA, USA
| | | | - Gregory M. Cole
- Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, CA, USA
| | - Clifford R. Jack
- Department of Diagnostic Radiology, Mayo Clinic, Rochester, MN, USA
| | - Leslie M. Shaw
- Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
| | - John Q. Trojanowski
- Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
| | | | - Michael W. Weiner
- Departments of Medicine, Radiology, and Psychiatry, UCSF, San Francisco, CA, USA
- Veterans Affairs Medical Center, San Francisco, CA, USA
| | - Liana G. Apostolova
- Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Imaging Genetics Center, Laboratory of Neuro Imaging, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
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Ungar L, Altmann A, Greicius MD. Apolipoprotein E, gender, and Alzheimer's disease: an overlooked, but potent and promising interaction. Brain Imaging Behav 2014; 8:262-73. [PMID: 24293121 DOI: 10.1007/s11682-013-9272-x] [Citation(s) in RCA: 169] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Alzheimer's disease (AD) is an increasingly prevalent, fatal neurodegenerative disease that has proven resistant, thus far, to all attempts to prevent it, forestall it, or slow its progression. The ε4 allele of the Apolipoprotein E gene (APOE4) is a potent genetic risk factor for sporadic and late-onset familial AD. While the link between APOE4 and AD is strong, many expected effects, like increasing the risk of conversion from MCI to AD, have not been widely replicable. One critical, and commonly overlooked, feature of the APOE4 link to AD is that several lines of evidence suggest it is far more pronounced in women than in men. Here we review previous literature on the APOE4 by gender interaction with a particular focus on imaging-related studies.
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Affiliation(s)
- Leo Ungar
- Functional Imaging in Neuropsychiatric Disorders (FIND) Lab, Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA,
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34
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Chouinard-Watkins R, Plourde M. Fatty acid metabolism in carriers of apolipoprotein E epsilon 4 allele: is it contributing to higher risk of cognitive decline and coronary heart disease? Nutrients 2014; 6:4452-71. [PMID: 25333200 PMCID: PMC4210928 DOI: 10.3390/nu6104452] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 09/02/2014] [Accepted: 09/24/2014] [Indexed: 01/01/2023] Open
Abstract
Apolipoprotein E (ApoE) is a protein playing a pivotal role in lipid homeostasis since it regulates cholesterol, triglyceride and phospholipid metabolism in the blood and the brain. APOE gene regulates the expression of this protein and has three different alleles: ε2, ε3 and ε4. Carrying an APOE4 allele is recognised as a genetic risk factor of late-onset Alzheimer’s disease (LOAD) and coronary heart disease (CHD). Consuming fatty fish, rich in long chain omega-3 fatty acids (LC omega-3), seems to be associated with risk reduction of developing LOAD and CHD but this link seems not to hold in APOE4 carriers, at least in LOAD. In CHD trials, APOE4 carriers supplemented with LC omega-3 were categorized as differential responders to the treatment with regards to CHD risk markers. This is potentially because fatty acid metabolism is disturbed in APOE4 carriers compared to the non-carriers. More specifically, homeostasis of LC omega-3 is disrupted in carriers of APOE4 allele and this is potentially because they β-oxidize more LC omega-3 than the non-carriers. Therefore, there is a potential shift in fatty acid selection for β-oxidation towards LC omega-3 which are usually highly preserved for incorporation into cell membranes.
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Affiliation(s)
- Raphaël Chouinard-Watkins
- Research Center on Aging, Health and Social Services Centre-University Institute of Geriatrics of Sherbrooke, Department of medicine, Université de Sherbrooke, 1036 Belvédère Sud, Sherbrooke, J1H 4C4, Canada.
| | - Mélanie Plourde
- Research Center on Aging, Health and Social Services Centre-University Institute of Geriatrics of Sherbrooke, Department of medicine, Université de Sherbrooke, 1036 Belvédère Sud, Sherbrooke, J1H 4C4, Canada.
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Burggren A, Brown J. Imaging markers of structural and functional brain changes that precede cognitive symptoms in risk for Alzheimer's disease. Brain Imaging Behav 2014; 8:251-61. [PMID: 24317680 PMCID: PMC4012007 DOI: 10.1007/s11682-013-9278-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Neuroimaging has rapidly advanced investigations into dysfunction both within and emanating from the hippocampus in early Alzheimer's disease . Focusing on prodromal subjects, we will discuss structural changes to hippocampal subregions, alterations to functional activity both within the hippocampus and elsewhere in the cortex, as well as changes to structural white matter connectivity and changes to functionally correlated patterns during memory performance. We present ample evidence that asymptomatic subjects demonstrate substantial identifiable brain changes before the onset of cognitive decline, but suggest there is significant work yet to be accomplished before applying these findings to individual patients.
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Affiliation(s)
- Alison Burggren
- Center for Cognitive Neurosciences, Semel Neuropsychiatric Institute, Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, CA, 90095, USA,
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Manning EN, Barnes J, Cash DM, Bartlett JW, Leung KK, Ourselin S, Fox NC. APOE ε4 is associated with disproportionate progressive hippocampal atrophy in AD. PLoS One 2014; 9:e97608. [PMID: 24878738 PMCID: PMC4039513 DOI: 10.1371/journal.pone.0097608] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 04/22/2014] [Indexed: 11/30/2022] Open
Abstract
Objectives To investigate whether APOE ε4 carriers have higher hippocampal atrophy rates than non-carriers in Alzheimer's disease (AD), mild cognitive impairment (MCI) and controls, and if so, whether higher hippocampal atrophy rates are still observed after adjusting for concurrent whole-brain atrophy rates. Methods MRI scans from all available visits in ADNI (148 AD, 307 MCI, 167 controls) were used. MCI subjects were divided into “progressors” (MCI-P) if diagnosed with AD within 36 months or “stable” (MCI-S) if a diagnosis of MCI was maintained. A joint multi-level mixed-effect linear regression model was used to analyse the effect of ε4 carrier-status on hippocampal and whole-brain atrophy rates, adjusting for age, gender, MMSE and brain-to-intracranial volume ratio. The difference in hippocampal rates between ε4 carriers and non-carriers after adjustment for concurrent whole-brain atrophy rate was then calculated. Results Mean adjusted hippocampal atrophy rates in ε4 carriers were significantly higher in AD, MCI-P and MCI-S (p≤0.011, all tests) compared with ε4 non-carriers. After adjustment for whole-brain atrophy rate, the difference in mean adjusted hippocampal atrophy rate between ε4 carriers and non-carriers was reduced but remained statistically significant in AD and MCI-P. Conclusions These results suggest that the APOE ε4 allele drives atrophy to the medial-temporal lobe region in AD.
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Affiliation(s)
- Emily N. Manning
- Dementia Research Centre, UCL Institute of Neurology, London, United Kingdom
- * E-mail:
| | - Josephine Barnes
- Dementia Research Centre, UCL Institute of Neurology, London, United Kingdom
| | - David M. Cash
- Dementia Research Centre, UCL Institute of Neurology, London, United Kingdom
- Centre for Medical Image Computing, University College London, London, United Kingdom
| | - Jonathan W. Bartlett
- Department of Medical Statistics, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Kelvin K. Leung
- Dementia Research Centre, UCL Institute of Neurology, London, United Kingdom
- Centre for Medical Image Computing, University College London, London, United Kingdom
| | - Sebastien Ourselin
- Dementia Research Centre, UCL Institute of Neurology, London, United Kingdom
- Centre for Medical Image Computing, University College London, London, United Kingdom
| | - Nick C. Fox
- Dementia Research Centre, UCL Institute of Neurology, London, United Kingdom
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Taylor JL, Scanlon BK, Farrell M, Hernandez B, Adamson MM, Ashford JW, Noda A, Murphy GM, Weiner MW. APOE-epsilon4 and aging of medial temporal lobe gray matter in healthy adults older than 50 years. Neurobiol Aging 2014; 35:2479-2485. [PMID: 24929969 DOI: 10.1016/j.neurobiolaging.2014.05.011] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Revised: 04/23/2014] [Accepted: 05/11/2014] [Indexed: 12/31/2022]
Abstract
Atrophy of the hippocampus and surrounding temporal regions occurs in Alzheimer's disease (AD). APOE ε4, the major genetic risk factor for late-onset AD, has been associated with smaller volume in these regions before amyloidosis can be detected by AD biomarkers. To examine APOE ε4 effects in relation to aging, we performed a longitudinal magnetic resonance imaging study involving cognitively normal adults (25 APOE ε4 carriers and 31 ε3 homozygotes), initially aged 51-75 years. We used growth curve analyses, which can provide information about APOE ε4-related differences initially and later in life. Hippocampal volume was the primary outcome; nearby medial temporal regions were secondary outcomes. Brain-derived neurotrophic factor, val66met was a secondary covariate. APOE ε4 carriers had significantly smaller initial hippocampal volumes than ε3 homozygotes. Rate of hippocampal atrophy was not greater in the APOE ε4 group, although age-related atrophy was detected in the overall sample. The findings add to the growing evidence that effects of APOE ε4 on hippocampal size begin early in life, underscoring the importance of early interventions to increase reserve.
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Affiliation(s)
- Joy L Taylor
- Veterans Affairs Palo Alto Health Care System, Sierra-Pacific MIRECC, Palo Alto CA, USA; Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA.
| | - Blake K Scanlon
- Veterans Affairs Palo Alto Health Care System, Sierra-Pacific MIRECC, Palo Alto CA, USA; Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Michelle Farrell
- Veterans Affairs Palo Alto Health Care System, Sierra-Pacific MIRECC, Palo Alto CA, USA; Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Beatriz Hernandez
- Veterans Affairs Palo Alto Health Care System, Sierra-Pacific MIRECC, Palo Alto CA, USA; Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Maheen M Adamson
- Veterans Affairs Palo Alto Health Care System, Sierra-Pacific MIRECC, Palo Alto CA, USA; Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - J Wesson Ashford
- Veterans Affairs Palo Alto Health Care System, Sierra-Pacific MIRECC, Palo Alto CA, USA; Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Art Noda
- Veterans Affairs Palo Alto Health Care System, Sierra-Pacific MIRECC, Palo Alto CA, USA; Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Greer M Murphy
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Michael W Weiner
- Department of Veterans Affairs Medical Center, Center for Imaging of Neurodegenerative Diseases, San Francisco, CA, USA; Department of Radiology, University of California, San Francisco, CA, USA
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Maruszak A, Thuret S. Why looking at the whole hippocampus is not enough-a critical role for anteroposterior axis, subfield and activation analyses to enhance predictive value of hippocampal changes for Alzheimer's disease diagnosis. Front Cell Neurosci 2014; 8:95. [PMID: 24744700 PMCID: PMC3978283 DOI: 10.3389/fncel.2014.00095] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2013] [Accepted: 03/13/2014] [Indexed: 01/06/2023] Open
Abstract
The hippocampus is one of the earliest affected brain regions in Alzheimer's disease (AD) and its dysfunction is believed to underlie the core feature of the disease-memory impairment. Given that hippocampal volume is one of the best AD biomarkers, our review focuses on distinct subfields within the hippocampus, pinpointing regions that might enhance the predictive value of current diagnostic methods. Our review presents how changes in hippocampal volume, shape, symmetry and activation are reflected by cognitive impairment and how they are linked with neurogenesis alterations. Moreover, we revisit the functional differentiation along the anteroposterior longitudinal axis of the hippocampus and discuss its relevance for AD diagnosis. Finally, we indicate that apart from hippocampal subfield volumetry, the characteristic pattern of hippocampal hyperactivation associated with seizures and neurogenesis changes is another promising candidate for an early AD biomarker that could become also a target for early interventions.
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Affiliation(s)
- Aleksandra Maruszak
- Centre for the Cellular Basis of Behaviour, Department of Neuroscience, Institute of Psychiatry, King’s College LondonLondon, UK
| | - Sandrine Thuret
- Centre for the Cellular Basis of Behaviour, Department of Neuroscience, Institute of Psychiatry, King’s College LondonLondon, UK
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Vandal M, Alata W, Tremblay C, Rioux-Perreault C, Salem N, Calon F, Plourde M. Reduction in DHA transport to the brain of mice expressing human APOE4 compared to APOE2. J Neurochem 2014; 129:516-26. [PMID: 24345162 DOI: 10.1111/jnc.12640] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 12/12/2013] [Accepted: 12/12/2013] [Indexed: 12/27/2022]
Abstract
Benefits on cognition from docosahexaenoic acid (DHA, 22 : 6 n-3) intake are absent in humans carrying apolipoprotein E ε4 allele (APOE4), the most important genetic risk factor for Alzheimer's disease (AD). To test the hypothesis that carrying APOE4 impairs DHA distribution, we evaluated plasma and brain fatty acid profiles and uptake of [(14) C]-DHA using in situ cerebral perfusion through the blood-brain barrier in 4- and 13-month-old male and female APOE-targeted replacement mice (APOE2, APOE3, and APOE4), fed with a DHA-depleted diet. Cortical and plasma DHA were 9% lower and 34% higher in APOE4 compared to APOE2 mice, respectively. Brain uptake of [(14) C]-DHA was 24% lower in APOE4 versus APOE2 mice. A significant relationship was established between DHA and apoE concentrations in the cortex of mice (r(2) = 0.21) and AD patients (r(2) = 0.32). Altogether, our results suggest that lower brain uptake of DHA in APOE4 than in APOE2 mice may limit the accumulation of DHA in cerebral tissues. These data provide a mechanistic explanation for the lack of benefit of DHA in APOE4 carriers on cognitive function and the risk of AD. Using human APOE2, 3, and 4 isoform-specific transgenic mice, we found a lower brain uptake of docosahexaenoic acid (DHA) in APOE4 than in APOE2 mice that may limit the biodistribution of DHA in cerebral tissues. These data provide a mechanistic explanation for the lack of benefit of DHA in APOE4 carriers on cognitive function and the risk of Alzheimer's disease (AD).
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Affiliation(s)
- Milène Vandal
- Centre de recherche du centre Hospitalier de l'Université Laval (CHUL), Québec City, Québec, Canada; Institut des Nutraceutiques et des Aliments Fonctionnels, Université Laval, Québec City, Québec, Canada
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Zetzsche T, Rujescu D, Hardy J, Hampel H. Advances and perspectives from genetic research: development of biological markers in Alzheimer’s disease. Expert Rev Mol Diagn 2014; 10:667-90. [PMID: 20629514 DOI: 10.1586/erm.10.48] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Thomas Zetzsche
- Department of Psychiatry and Psychotherapy, Ludwig-Maximilian-University, Nussbaumstrasse 7, Munich, Germany. thomas.zetzsche@ med.uni-muenchen.de
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Lyall DM, Royle NA, Harris SE, Bastin ME, Maniega SM, Murray C, Lutz MW, Saunders AM, Roses AD, del Valdés Hernández MC, Starr JM, Porteous DJ, Wardlaw JM, Deary IJ. Alzheimer's disease susceptibility genes APOE and TOMM40, and hippocampal volumes in the Lothian birth cohort 1936. PLoS One 2013; 8:e80513. [PMID: 24260406 PMCID: PMC3829876 DOI: 10.1371/journal.pone.0080513] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Accepted: 10/04/2013] [Indexed: 12/12/2022] Open
Abstract
The APOE ε and TOMM40 rs10524523 (‘523’) variable length poly-T repeat gene loci have been significantly and independently associated with Alzheimer’s disease (AD) related phenotypes such as age of clinical onset. Hippocampal atrophy has been significantly associated with memory impairment, a characteristic of AD. The current study aimed to test for independent effects of APOE ε and TOMM40 ‘523’ genotypes on hippocampal volumes as assessed by brain structural MRI in a relatively large sample of community-dwelling older adults. As part of a longitudinal study of cognitive ageing, participants in the Lothian Birth Cohort 1936 underwent genotyping for APOE ε2/ε3/ε4 status and TOMM40 ‘523’ poly-T repeat length, and detailed structural brain MRI at a mean age of 72.7 years (standard deviation = 0.7, N range = 624 to 636). No significant effects of APOE ε or TOMM40 523 genotype were found on hippocampal volumes when analysed raw, or when adjusted for either intracranial or total brain tissue volumes. In summary, in a large community-dwelling sample of older adults, we found no effects of APOE ε or TOMM40 523 genotypes on hippocampal volumes. This is discrepant with some previous reports of significant association between APOE and left/right hippocampal volumes, and instead echoes other reports that found no association. Previous significant findings may partly reflect type 1 error. Future studies should carefully consider: 1) their specific techniques in adjusting for brain size; 2) assessing more detailed sub-divisions of the hippocampal formation; and 3) testing whether significant APOE-hippocampal associations are independent of generalised brain atrophy.
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Affiliation(s)
- Donald M. Lyall
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom
- Brain Research Imaging Centre, Division of Neuroimaging Sciences, University of Edinburgh, Edinburgh, United Kingdom
- Department of Psychology, University of Edinburgh, Edinburgh, United Kingdom
- Medical Genetics Section, Centre for Genomics and Experimental Medicine and MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, United Kingdom
| | - Natalie A. Royle
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom
- Brain Research Imaging Centre, Division of Neuroimaging Sciences, University of Edinburgh, Edinburgh, United Kingdom
- Scottish Imaging Network, A Platform for Scientific Excellence (SINAPSE) Collaboration, Division of Neuroimaging Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - Sarah E. Harris
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom
- Medical Genetics Section, Centre for Genomics and Experimental Medicine and MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, United Kingdom
| | - Mark E. Bastin
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom
- Brain Research Imaging Centre, Division of Neuroimaging Sciences, University of Edinburgh, Edinburgh, United Kingdom
- Scottish Imaging Network, A Platform for Scientific Excellence (SINAPSE) Collaboration, Division of Neuroimaging Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - Susana Muñoz Maniega
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom
- Brain Research Imaging Centre, Division of Neuroimaging Sciences, University of Edinburgh, Edinburgh, United Kingdom
- Scottish Imaging Network, A Platform for Scientific Excellence (SINAPSE) Collaboration, Division of Neuroimaging Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - Catherine Murray
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom
- Department of Psychology, University of Edinburgh, Edinburgh, United Kingdom
| | - Michael W. Lutz
- Joseph & Kathleen Bryan Alzheimer’s Disease Research Center, Department of Neurology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Ann M. Saunders
- Joseph & Kathleen Bryan Alzheimer’s Disease Research Center, Department of Neurology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Allen D. Roses
- Joseph & Kathleen Bryan Alzheimer’s Disease Research Center, Department of Neurology, Duke University Medical Center, Durham, North Carolina, United States of America
- Zinfandel Pharmaceuticals, Inc., Durham, North Carolina, United States of America
| | - Maria C. del Valdés Hernández
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom
- Brain Research Imaging Centre, Division of Neuroimaging Sciences, University of Edinburgh, Edinburgh, United Kingdom
- Scottish Imaging Network, A Platform for Scientific Excellence (SINAPSE) Collaboration, Division of Neuroimaging Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - John M. Starr
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom
- Alzheimer Scotland Dementia Research Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - David. J. Porteous
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom
- Medical Genetics Section, Centre for Genomics and Experimental Medicine and MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, United Kingdom
| | - Joanna M. Wardlaw
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom
- Brain Research Imaging Centre, Division of Neuroimaging Sciences, University of Edinburgh, Edinburgh, United Kingdom
- Scottish Imaging Network, A Platform for Scientific Excellence (SINAPSE) Collaboration, Division of Neuroimaging Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - Ian J. Deary
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom
- Department of Psychology, University of Edinburgh, Edinburgh, United Kingdom
- * E-mail:
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Protas HD, Chen K, Langbaum JBS, Fleisher AS, Alexander GE, Lee W, Bandy D, de Leon MJ, Mosconi L, Buckley S, Truran-Sacrey D, Schuff N, Weiner MW, Caselli RJ, Reiman EM. Posterior cingulate glucose metabolism, hippocampal glucose metabolism, and hippocampal volume in cognitively normal, late-middle-aged persons at 3 levels of genetic risk for Alzheimer disease. JAMA Neurol 2013; 70:320-5. [PMID: 23599929 DOI: 10.1001/2013.jamaneurol.286] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
OBJECTIVE To characterize and compare measurements of the posterior cingulate glucose metabolism, the hippocampal glucose metabolism, and hippocampal volume so as to distinguish cognitively normal, late-middle-aged persons with 2, 1, or 0 copies of the apolipoprotein E (APOE) ε4 allele, reflecting 3 levels of risk for late-onset Alzheimer disease. DESIGN Cross-sectional comparison of measurements of cerebral glucose metabolism using 18F-fluorodeoxyglucose positron emission tomography and measurements of brain volume using magnetic resonance imaging in cognitively normal ε4 homozygotes, ε4 heterozygotes, and noncarriers. SETTING Academic medical center. PARTICIPANTS A total of 31 ε4 homozygotes, 42 ε4 heterozygotes, and 76 noncarriers, 49 to 67 years old, matched for sex, age, and educational level. MAIN OUTCOME MEASURES The measurements of posterior cingulate and hippocampal glucose metabolism were characterized using automated region-of-interest algorithms and normalized for whole-brain measurements. The hippocampal volume measurements were characterized using a semiautomated algorithm and normalized for total intracranial volume. RESULTS Although there were no significant differences among the 3 groups of participants in their clinical ratings, neuropsychological test scores, hippocampal volumes (P = .60), or hippocampal glucose metabolism measurements (P = .12), there were significant group differences in their posterior cingulate glucose metabolism measurements (P = .001). The APOE ε4 gene dose was significantly associated with posterior cingulate glucose metabolism (r = 0.29, P = .0003), and this association was significantly greater than those with hippocampal volume or hippocampal glucose metabolism (P < .05, determined by use of pairwise Fisher z tests). CONCLUSIONS Although our findings may depend in part on the analysis algorithms used, they suggest that a reduction in posterior cingulate glucose metabolism precedes a reduction in hippocampal volume or metabolism in cognitively normal persons at increased genetic risk for Alzheimer disease.
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Affiliation(s)
- Hillary D Protas
- Banner Alzheimer's Institute, 901 E Willetta St, Phoenix, AZ 85006, USA.
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Liu J, Yin C, Xia S, Jia L, Guo Y, Zhao Z, Li X, Han Y, Jia J. White matter changes in patients with amnestic mild cognitive impairment detected by diffusion tensor imaging. PLoS One 2013; 8:e59440. [PMID: 23555673 PMCID: PMC3605411 DOI: 10.1371/journal.pone.0059440] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2012] [Accepted: 02/14/2013] [Indexed: 01/03/2023] Open
Abstract
Compared to normal aging adults, individuals with amnestic mild cognitive impairment (aMCI) have significantly increased risk for progressing into Alzheimer's disease (AD). Autopsy studies found that most of the brains of aMCI cases showed anatomical features associated with AD pathology. The recent development of non-invasive neuroimaging technique, such as diffusion tensor imaging (DTI), makes it possible to investigate the microstructures of the cerebral white matter in vivo. We hypothesized that disrupted white matter (WM) integrity existed in aMCI. So we used DTI technique, by measuring fractional anisotropy (FA) and mean diffusivity (MD), to test the brain structures involved in patients with aMCI. DTI scans were collected from 40 patients with aMCI, and 28 normal controls (NC). Tract-based spatial statistics (TBSS) analyses of whole-brain FA and MD images in each individual and group comparisons were carried out. Compared to NC, aMCI patients showed significant FA reduction bilaterally, in the association and projection fibers of frontal, parietal, and temporal lobes, corpus callosum, bilateral corona radiation, right posterior thalamic radiation and right sagittal stratum. aMCI patients also showed significantly increased MD widespreadly in the association and projection fibers of frontal, parietal and temporal lobes, and corpus callosum. Assessment of the WM integrity of the frontal, parietal, temporal lobes, and corpus callosum by using DTI measures may aid early diagnosis of aMCI.
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Affiliation(s)
- Jianghong Liu
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, PR China
- Key Neurodegenerative Laboratory of Ministry of Education of the People’s Republic of China, Beijing, PR China
| | - Changhao Yin
- Department of Neurology, Hongqi Hospital of Mudanjiang Medical College, Mudangjiang, China
| | - Shugao Xia
- Gruss Magnetic Resonance Research Center, Departments of Radiology, Neuroscience, Psychiatry and Behavioral Sciences, Albert Einstein College of Medicine, Yeshiva University, Bronx, New York, United States of America
| | - Longfei Jia
- Department of Neurology, Tongren Hospital, Capital Medical University, Beijing, China
| | - Yanqin Guo
- Department of Neurology, Hongqi Hospital of Mudanjiang Medical College, Mudangjiang, China
| | - Zhilian Zhao
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Xiaobo Li
- Gruss Magnetic Resonance Research Center, Departments of Radiology, Neuroscience, Psychiatry and Behavioral Sciences, Albert Einstein College of Medicine, Yeshiva University, Bronx, New York, United States of America
| | - Ying Han
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, PR China
- Key Neurodegenerative Laboratory of Ministry of Education of the People’s Republic of China, Beijing, PR China
| | - Jianping Jia
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, PR China
- Key Neurodegenerative Laboratory of Ministry of Education of the People’s Republic of China, Beijing, PR China
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Caselli RJ, Reiman EM. Characterizing the preclinical stages of Alzheimer's disease and the prospect of presymptomatic intervention. J Alzheimers Dis 2013; 33 Suppl 1:S405-16. [PMID: 22695623 PMCID: PMC3628721 DOI: 10.3233/jad-2012-129026] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Studies of asymptomatic carriers of genes that are known to predispose to Alzheimer's disease (AD) have facilitated the characterization of preclinical AD. The most prevalent genetic risk factor is the ε4 allele of apolipoprotein E (APOE). Neuropathological studies of young deceased ε4 carriers have shown modest but abnormal amounts of neocortical amyloid and medial temporal neurofibrillary tangles that is also reflected in cerebrospinal fluid (CSF) biomarkers, amyloid-β, and phospho-tau in particular. MRI studies have shown progressive hippocampal and gray matter atrophy with the advent of mild cognitive impairment (MCI), and fluorodeoxyglucose PET scans show reduced cerebral metabolism in posterior cingulate and related AD regions evident even in 30 year olds. Cerebral amyloidosis disclosed by more recent amyloid ligand PET studies in asymptomatic 60 year olds increases in parallel with ε4 gene dose. Longitudinal neuropsychological studies have revealed accelerated memory decline in ε4 carriers beginning around age 55-60 years whose severity again parallels ε4 gene dose. The clinico-pathological correlation of declining memory and AD-like neuropathological change defines preclinical AD and has set the stage for the accelerated evaluation of presymptomatic AD treatments. In this article, we briefly consider some of the earliest detectable changes associated with the predisposition to AD, and some of the prevention trial strategies that have been proposed to help find treatments to reduce the risk, postpone the onset of, or completely prevent AD symptoms as soon as possible.
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45
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O'Dwyer L, Lamberton F, Matura S, Tanner C, Scheibe M, Miller J, Rujescu D, Prvulovic D, Hampel H. Reduced hippocampal volume in healthy young ApoE4 carriers: an MRI study. PLoS One 2012; 7:e48895. [PMID: 23152815 PMCID: PMC3494711 DOI: 10.1371/journal.pone.0048895] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 10/03/2012] [Indexed: 11/19/2022] Open
Abstract
The E4 allele of the ApoE gene has consistently been shown to be related to an increased risk of Alzheimer's disease (AD). The E4 allele is also associated with functional and structural grey matter (GM) changes in healthy young, middle-aged and older subjects. Here, we assess volumes of deep grey matter structures of 22 healthy younger ApoE4 carriers and 22 non-carriers (20-38 years). Volumes of the nucleus accumbens, amygdala, caudate nucleus, hippocampus, pallidum, putamen, thalamus and brain stem were calculated by FMRIB's Integrated Registration and Segmentation Tool (FIRST) algorithm. A significant drop in volume was found in the right hippocampus of ApoE4 carriers (ApoE4+) relative to non-carriers (ApoE4-), while there was a borderline significant decrease in the volume of the left hippocampus of ApoE4 carriers. The volumes of no other structures were found to be significantly affected by genotype. Atrophy has been found to be a sensitive marker of neurodegenerative changes, and our results show that within a healthy young population, the presence of the ApoE4+ carrier gene leads to volume reduction in a structure that is vitally important for memory formation. Our results suggest that the hippocampus may be particularly vulnerable to further degeneration in ApoE4 carriers as they enter middle and old age. Although volume reductions were noted bilaterally in the hippocampus, atrophy was more pronounced in the right hippocampus. This finding relates to previous work which has noted a compensatory increase in right hemisphere activity in ApoE4 carriers in response to preclinical declines in memory function. Possession of the ApoE4 allele may lead to greater predilection for right hemisphere atrophy even in healthy young subjects in their twenties.
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Affiliation(s)
- Laurence O'Dwyer
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, Goethe University, Frankfurt, Germany.
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46
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Delano-Wood L, Stricker NH, Sorg SF, Nation DA, Jak AJ, Woods SP, Libon DJ, Delis DC, Frank LR, Bondi MW. Posterior cingulum white matter disruption and its associations with verbal memory and stroke risk in mild cognitive impairment. J Alzheimers Dis 2012; 29:589-603. [PMID: 22466061 DOI: 10.3233/jad-2012-102103] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Medial temporal lobe and temporoparietal brain regions are among the earliest neocortical sites to undergo pathophysiologic alterations in Alzheimer's disease (AD), although the underlying white matter changes in these regions is less well known. We employed diffusion tensor imaging to evaluate early alterations in regional white matter integrity in participants diagnosed with mild cognitive impairment (MCI). The following regions of interests (ROIs) were examined: 1) anterior cingulum (AC); 2) posterior cingulum (PC); 3) genu of the corpus callosum; 4) splenium of the corpus callosum; and 5) as a control site for comparison, posterior limb of the internal capsule. Forty nondemented participants were divided into demographically-similar groups based on cognitive status (MCI: n = 20; normal control: n = 20), and fractional anisotropy (FA) estimates of each ROI were obtained. MCI participants showed greater posterior white matter (i.e., PC, splenium) but not anterior white matter (i.e., AC, genu) changes, after adjusting for age, stroke risk, and whole brain volume. FA differences of the posterior white matter were best accounted for by changes in radial but not axial diffusivity. PC FA was also significantly positively correlated with hippocampal volume as well as with performance on tests of verbal memory, whereas stroke risk was significantly correlated with genu FA and was unrelated to PC FA. When investigating subtypes of our MCI population, amnestic MCI participants showed lower PC white matter integrity relative to those with non-amnestic MCI. Findings implicate involvement of posterior microstructural white matter degeneration in the development of MCI-related cognitive changes and suggest that reduced FA of the PC may be a candidate neuroimaging marker of AD risk.
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47
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Family history and APOE-4 genetic risk in Alzheimer's disease. Neuropsychol Rev 2012; 22:298-309. [PMID: 22359096 DOI: 10.1007/s11065-012-9193-2] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 02/13/2012] [Indexed: 12/14/2022]
Abstract
Identifying risk factors for Alzheimer's disease, such as carrying the APOE-4 allele, and understanding their contributions to disease pathophysiology or clinical presentation is critical for establishing and improving diagnostic and therapeutic strategies. A first-degree family history of Alzheimer's disease represents a composite risk factor, which reflects the influence of known and unknown susceptibility genes and perhaps non-genetic risks. There is emerging evidence that investigating family history risk associated effects may contribute to advances in Alzheimer's disease research and ultimately clinical practice.
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48
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Eyler LT, Prom-Wormley E, Fennema-Notestine C, Panizzon MS, Neale MC, Jernigan TL, Fischl B, Franz CE, Lyons MJ, Stevens A, Pacheco J, Perry ME, Schmitt JE, Spitzer NC, Seidman LJ, Thermenos HW, Tsuang MT, Dale AM, Kremen WS. Genetic patterns of correlation among subcortical volumes in humans: results from a magnetic resonance imaging twin study. Hum Brain Mapp 2012; 32:641-53. [PMID: 20572207 DOI: 10.1002/hbm.21054] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Little is known about genetic influences on the volume of subcortical brain structures in adult humans, particularly whether there is regional specificity of genetic effects. Understanding patterns of genetic covariation among volumes of subcortical structures may provide insight into the development of individual differences that have consequences for cognitive and emotional behavior and neuropsychiatric disease liability. We measured the volume of 19 subcortical structures (including brain and ventricular regions) in 404 twins (110 monozygotic and 92 dizygotic pairs) from the Vietnam Era Twin Study of Aging and calculated the degree of genetic correlation among these volumes. We then examined the patterns of genetic correlation through hierarchical cluster analysis and by principal components analysis. We found that a model with four genetic factors best fit the data: a Basal Ganglia/Thalamus factor; a Ventricular factor; a Limbic factor; and a Nucleus Accumbens factor. Homologous regions from each hemisphere loaded on the same factors. The observed patterns of genetic correlation suggest the influence of multiple genetic influences. There is a genetic organization among structures which distinguishes between brain and cerebrospinal fluid spaces and between different subcortical regions. Further study is needed to understand this genetic patterning and whether it reflects influences on early development, functionally dependent patterns of growth or pruning, or regionally specific losses due to genes involved in aging, stress response, or disease.
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Affiliation(s)
- Lisa T Eyler
- Department of Psychiatry, University of California, San Diego, La Jolla, California, USA.
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49
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Lu PH, Thompson PM, Leow A, Lee GJ, Lee A, Yanovsky I, Parikshak N, Khoo T, Wu S, Geschwind D, Bartzokis G. Apolipoprotein E genotype is associated with temporal and hippocampal atrophy rates in healthy elderly adults: a tensor-based morphometry study. J Alzheimers Dis 2011; 23:433-42. [PMID: 21098974 DOI: 10.3233/jad-2010-101398] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Apolipoprotein E (ApoE) ε4 genotype is a strong risk factor for developing Alzheimer's disease (AD). Conversely, the presence of the ε2 allele has been shown to mitigate cognitive decline. Tensor-based morphometry (TBM), a novel computational approach for visualizing longitudinal progression of brain atrophy, was used to determine whether cognitively intact elderly participants with the ε4 allele demonstrate greater volume reduction than those with the ε2 allele. Healthy "younger elderly" volunteers, aged 55-75, were recruited from the community and hospital staff. They were evaluated with a baseline and follow-up MRI scan (mean scan interval = 4.72 years, s.d. = 0.55) and completed ApoE genotyping. Twenty-seven participants were included in the study of which 16 had the ε4 allele (all heterozygous ε3ε4 genotype) and 11 had the ε2ε3 genotype. The two groups did not differ significantly on any demographic characteristics and all subjects were cognitively "normal" at both baseline and follow-up time points. TBM was used to create 3D maps of local brain tissue atrophy rates for individual participants; these spatially detailed 3D maps were compared between the two ApoE groups. Regional analyses were performed and the ε4 group demonstrated significantly greater annual atrophy rates in the temporal lobes (p = 0.048) and hippocampus (p = 0.016); greater volume loss was observed in the right hippocampus than the left. TBM appears to be useful in tracking longitudinal progression of brain atrophy in cognitively asymptomatic adults. Possession of the ε4 allele is associated with greater temporal and hippocampal volume reduction well before the onset of cognitive deficits.
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Affiliation(s)
- Po H Lu
- Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-7226, USA.
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Prasad K, Wiryasaputra L, Ng A, Kandiah N. White matter disease independently predicts progression from mild cognitive impairment to Alzheimer's disease in a clinic cohort. Dement Geriatr Cogn Disord 2011; 31:431-4. [PMID: 21757908 DOI: 10.1159/000330019] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/06/2011] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The contribution of vascular pathology to the rate of progression from mild cognitive impairment (MCI) to Alzheimer's disease (AD) remains unclear. OBJECTIVE To ascertain the relative roles of cerebral white matter disease and medial temporal atrophy (MTA) in predicting progression from MCI to AD. METHODS MCI patients with baseline MRI and ≥18 months of longitudinal follow-up were evaluated. DSM-IV-TR criteria were used to diagnose conversion to dementia. MTA and white matter hyperintensity (WMH) were quantified using the Scheltens scale and modified Fazekas scale. RESULTS Of a total of 171 MCI patients, 79 patients with baseline MRI and longitudinal follow-up were studied. Twenty-three MCI patients who progressed to dementia (MCI-P) were identified corresponding to a 19.4% annual risk of conversion. In MCI-P patients, the mean Mini-Mental State Examination and Montreal Cognitive Assessment decline was 1.3 and 2.9 points, respectively. MTA, periventricular WMH and deep subcortical WMH were significantly greater in the MCI-P cohort. WMH was found to predict MCI-P with an odds ratio of 7.69 (p = 0.03). CONCLUSION MTA and deep subcortical WMH independently predict conversion from MCI to AD. Optimization of vascular risk factors among patients with MCI can potentially reduce the conversion from MCI to AD.
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Affiliation(s)
- Kalpana Prasad
- Department of Neurology, National Neuroscience Institute, 11 Jalan Tock Seng, Singapore
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