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Lindner K, Gavin AC. Isoform- and cell-state-specific APOE homeostasis and function. Neural Regen Res 2024; 19:2456-2466. [PMID: 38526282 PMCID: PMC11090418 DOI: 10.4103/nrr.nrr-d-23-01470] [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: 08/31/2023] [Revised: 11/17/2023] [Accepted: 12/26/2023] [Indexed: 03/26/2024] Open
Abstract
Apolipoprotein E is the major lipid transporter in the brain and an important player in neuron-astrocyte metabolic coupling. It ensures the survival of neurons under stressful conditions and hyperactivity by nourishing and detoxifying them. Apolipoprotein E polymorphism, combined with environmental stresses and/or age-related alterations, influences the risk of developing late-onset Alzheimer's disease. In this review, we discuss our current knowledge of how apolipoprotein E homeostasis, i.e. its synthesis, secretion, degradation, and lipidation, is affected in Alzheimer's disease.
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Affiliation(s)
- Karina Lindner
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Diabetes Center, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Anne-Claude Gavin
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Diabetes Center, Faculty of Medicine, University of Geneva, Geneva, Switzerland
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2
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Sprague B, Zhu X, Rosso A, Verghese J, Delbaere K, Lipnicki D, Sachdev P, Ng T, Gwee X, Yap K, Kim KW, Han J, Oh D, Narazaki K, Chen T, Chen S, Brodaty H, Numbers K, Kochan N, Walker R, Paddick SM, Gureje O, Ojagbemi A, Bello T, Rosano C. Correlates of Gait Speed Among Older Adults From 6 Countries: Findings From the COSMIC Collaboration. J Gerontol A Biol Sci Med Sci 2023; 78:2396-2406. [PMID: 36975099 PMCID: PMC10692426 DOI: 10.1093/gerona/glad090] [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: 06/13/2022] [Indexed: 03/29/2023] Open
Abstract
BACKGROUND Few studies have compared gait speed and its correlates among different ethnogeographic regions. The goals of this study were to describe usual and rapid gait speed, and identify their correlates across Australian, Asian, and African countries. METHODS We used data from 6 population-based cohorts of adults aged 65+ from 6 countries and 3 continents (N = 6 472), with samples ranging from 231 to 1 913. All cohorts are members of the Cohort Studies of Memory in an International Consortium collaboration. We investigated whether clinical (body mass index [BMI], hypertension, stroke, apolipoprotein status), psychological (cognition, mood, general health), and behavioral factors (smoking, drinking, physical activity) correlated with usual (N = 4 cohorts) and rapid gait speed (N = 3 cohorts) similarly across cohorts. Regression models were controlled for age, sex, and education, and were sex-stratified. RESULTS Age- and sex-standardized usual gait speed means ranged from 0.61 to 1.06 m/s and rapid gait speed means ranged from 1.16 to 1.64 m/s. Lower BMI and better cognitive function consistently correlated with faster gait speed in all cohorts. Less consistently, not having hypertension and greater physical activity engagement were associated with faster gait speed. Associations with mood, smoking, and drinking were largely nonsignificant. These patterns were not attenuated by demographics. There was limited evidence that the associations differed by sex, except physical activity, where the greater intensity was associated with usual gait among men but not women. CONCLUSIONS This study is among the first to describe the usual and rapid gait speeds across older adults in Africa, Asia, and Australia.
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Affiliation(s)
- Briana N Sprague
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania,USA
| | - Xiaonan Zhu
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania,USA
| | - Andrea L Rosso
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania,USA
| | - Joe Verghese
- Department of Neurology, Albert Einstein College of Medicine, New York, New York, USA
- Department of Medicine, Albert Einstein College of Medicine, New York, New York, USA
| | - Kim Delbaere
- Falls, Balance and Injury Research Centre, Neuroscience Research Australia, Randwick, New South Wales, Australia
- School of Population Health, University of New South Wales, Sydney, New South Wales, Australia
| | - Darren M Lipnicki
- Centre for Healthy Brain Ageing (CHeBA), University of New South Wales, Sydney, New South Wales, Australia
| | - Perminder S Sachdev
- School of Population Health, University of New South Wales, Sydney, New South Wales, Australia
- Neuropsychiatric Institute, The Prince of Wales Hospital, Sydney, New South Wales, Australia
| | - Tze Pin Ng
- Department of Psychological Medicine, National University of Singapore, Singapore, Singapore
| | - Xinyi Gwee
- Department of Psychological Medicine, National University of Singapore, Singapore, Singapore
| | - Keng Bee Yap
- Department of Geriatric Medicine, Ng Teng Fong Hospital, Singapore, Singapore
| | - Ki-Woong Kim
- Department of Neuropsychiatry, Seoul National University, Bundang Hospital, Seongnam, South Korea
- Department of Psychiatry, Seoul National University College of Medicine, Seoul, South Korea
- Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, South Korea
| | - Ji Won Han
- Department of Neuropsychiatry, Seoul National University, Bundang Hospital, Seongnam, South Korea
- Department of Psychiatry, Seoul National University College of Medicine, Seoul, South Korea
| | - Dae Jong Oh
- Department of Psychiatry, Seoul National University College of Medicine, Seoul, South Korea
- Department of Psychiatry, SMG-SNU Boramae Medical Center, Seoul, South Korea
| | - Kenji Narazaki
- Center for Liberal Arts, Fukuoka Institute of Technology, Fukuoka, Japan
| | - Tao Chen
- Sports and Health Research Center, Department of Physical Education, Tongji University, Shanghai, China
| | - Sanmei Chen
- Department of Health Sciences, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Henry Brodaty
- Centre for Healthy Brain Ageing (CHeBA), University of New South Wales, Sydney, New South Wales, Australia
| | - Katya Numbers
- Centre for Healthy Brain Ageing (CHeBA), University of New South Wales, Sydney, New South Wales, Australia
| | - Nicole A Kochan
- Centre for Healthy Brain Ageing (CHeBA), University of New South Wales, Sydney, New South Wales, Australia
| | - Richard W Walker
- Department of Medicine, North Tyneside General Hospital, North Shields, UK
| | - Stella-Maria Paddick
- Translational and Clinical Research Institute; Newcastle University, Newcastle upon Tyne, UK
| | - Oye Gureje
- Department of Psychiatry, University of Ibadan, Ibadan, Nigeria
| | - Akin Ojagbemi
- Department of Psychiatry, University of Ibadan, Ibadan, Nigeria
| | - Toyin Bello
- Department of Psychiatry, University of Ibadan, Ibadan, Nigeria
| | - Caterina Rosano
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania,USA
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3
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Lu J, Ruan Y. Exploring the Reciprocal Relationship between Depressive Symptoms and Cognitive Function among Chinese Older Adults. Healthcare (Basel) 2023; 11:2880. [PMID: 37958024 PMCID: PMC10648665 DOI: 10.3390/healthcare11212880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 10/29/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023] Open
Abstract
(1) Objectives: This study aims to investigate the bidirectional relationship between depressive symptoms and cognitive function among older adults in China, addressing a research gap in the context of developing nations. (2) Methods: A total of 3813 adults aged 60 and older participating in 2013, 2015, and 2018 waves of the China Health and Retirement Longitudinal Study (CHARLS) were included. A fixed-effects model and cross-lagged panel model (CLPM) was utilized. (3) Results: First, the results indicated that a significant negative correlation existed between depressive symptoms and cognitive function in older adults during the study period (β = -0.084, p < 0.001). Second, after controlling for unobserved confounding factors, the deterioration and improvement of depressive symptoms still significantly affected cognitive function (β = -0.055, p < 0.001). Third, using the cross-lagged panel model, we observed a reciprocal relationship between depressive symptoms (Dep) and cognitive function (Cog) among Chinese older adults (Dep2013 → Cog2015, β = -0.025, p < 0.01; Dep2015 → Cog2018, β = -0.028, p < 0.001; Cog2013 → Dep2015, β = -0.079, p < 0.01; Cog2015 → Dep2018, β = -0.085, p < 0.01). (4) Discussion: The reciprocal relationship between depressive symptoms and cognitive functioning in older adults emphasizes the need for integrated public health policies and clinical interventions, to develop comprehensive intervention strategies that simultaneously address depressive symptoms and cognitive decline.
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Affiliation(s)
- Jiehua Lu
- Department of Sociology, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, China
| | - Yunchen Ruan
- School of Humanities and Social Sciences, Fuzhou University, No. 2 Xueyuan Road, Fuzhou 350108, China
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4
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James KA, Stromin JI, Steenkamp N, Combrinck MI. Understanding the relationships between physiological and psychosocial stress, cortisol and cognition. Front Endocrinol (Lausanne) 2023; 14:1085950. [PMID: 36950689 PMCID: PMC10025564 DOI: 10.3389/fendo.2023.1085950] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 02/14/2023] [Indexed: 03/08/2023] Open
Abstract
Stress is viewed as a state of real or perceived threat to homeostasis, the management of which involves the endocrine, nervous, and immune systems. These systems work independently and interactively as part of the stress response. The scientific stress literature, which spans both animal and human studies, contains heterogeneous findings about the effects of stress on the brain and the body. This review seeks to summarise and integrate literature on the relationships between these systems, examining particularly the roles of physiological and psychosocial stress, the stress hormone cortisol, as controlled by the hypothalamic-pituitary-adrenal (HPA) axis, and the effects of stress on cognitive functioning. Health conditions related to impaired HPA axis functioning and their associated neuropsychiatric symptoms will also be considered. Lastly, this review will provide suggestions of clinical applicability for endocrinologists who are uniquely placed to measure outcomes related to endocrine, nervous and immune system functioning and identify areas of intervention.
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Affiliation(s)
- Katharine Ann James
- Applied Cognitive Science and Experimental Neuropsychology Team (ACSENT) Laboratory, Department of Psychology, University of Cape Town, Cape Town, South Africa
- Division of Geriatric Medicine, Department of Medicine, University of Cape Town, Cape Town, South Africa
| | - Juliet Ilena Stromin
- Applied Cognitive Science and Experimental Neuropsychology Team (ACSENT) Laboratory, Department of Psychology, University of Cape Town, Cape Town, South Africa
| | - Nina Steenkamp
- Applied Cognitive Science and Experimental Neuropsychology Team (ACSENT) Laboratory, Department of Psychology, University of Cape Town, Cape Town, South Africa
| | - Marc Irwin Combrinck
- Division of Geriatric Medicine, Department of Medicine, University of Cape Town, Cape Town, South Africa
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5
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Niotis K, Akiyoshi K, Carlton C, Isaacson R. Dementia Prevention in Clinical Practice. Semin Neurol 2022; 42:525-548. [PMID: 36442814 DOI: 10.1055/s-0042-1759580] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Over 55 million people globally are living with dementia and, by 2050, this number is projected to increase to 131 million. This poses immeasurable challenges for patients and their families and a significant threat to domestic and global economies. Given this public health crisis and disappointing results from disease-modifying trials, there has been a recent shift in focus toward primary and secondary prevention strategies. Approximately 40% of Alzheimer's disease (AD) cases, which is the most common form of dementia, may be prevented or at least delayed. Success of risk reduction studies through addressing modifiable risk factors, in addition to the failure of most drug trials, lends support for personalized multidomain interventions rather than a "one-size-fits-all" approach. Evolving evidence supports early intervention in at-risk patients using individualized interventions directed at modifiable risk factors. Comprehensive risk stratification can be informed by emerging principals of precision medicine, and include expanded clinical and family history, anthropometric measurements, blood biomarkers, neurocognitive evaluation, and genetic information. Risk stratification is key in differentiating subtypes of dementia and identifies targetable areas for intervention. This article reviews a clinical approach toward dementia risk stratification and evidence-based prevention strategies, with a primary focus on AD.
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Affiliation(s)
- Kellyann Niotis
- Department of Neurology, Weill Cornell Medicine and New York - Presbyterian, New York, New York
| | - Kiarra Akiyoshi
- Department of Neurology, Weill Cornell Medicine and New York - Presbyterian, New York, New York
| | - Caroline Carlton
- Department of Neurology, Weill Cornell Medicine and New York - Presbyterian, New York, New York
| | - Richard Isaacson
- Department of Neurology, Weill Cornell Medicine and New York - Presbyterian, New York, New York.,Department of Neurology, Florida Atlantic University, Charles E. Schmidt College of Medicine, Boca Raton, Florida
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6
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Nguyen TD, Watanabe A, Burleigh S, Ghaffarzadegan T, Kanklai J, Prykhodko O, Hållenius FF, Nyman M. Monobutyrin and monovalerin improve gut–blood–brain biomarkers and alter gut microbiota composition in high-fat fed apolipoprotein-E-knockout rats. Sci Rep 2022; 12:15454. [PMID: 36104381 PMCID: PMC9475028 DOI: 10.1038/s41598-022-19502-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 08/30/2022] [Indexed: 11/09/2022] Open
Abstract
Monobutyrin (MB) and monovalerin (MV), glycerol esters of short-chain fatty acids (SCFAs), have been shown to positively influence lipid profile and biomarkers in the gut and brain. This study examined whether MB and MV in high-fat diets, affected microbiota composition and gut–blood–brain markers in apolipoprotein E deficient (ApoE-/-) rats, a model for studies of lipid-associated disorders, and neurodegenerative processes in Alzheimer’s disease (AD). ApoE-/- rats fed MB and MV increased Tenericutes and the brain neurotransmitter γ-aminobutyric acid (GABA), while the blood stress hormone corticosterone decreased compared to control rats. Only rats that received MB showed a significant increase in cholic acid and Adlercreutzia in the caecum. In rats fed MV, the decrease of Proteobacteria was associated with decreased corticosterone levels. Conclusively, dietary supplementation of SCFA glycerol esters can modulate gut–blood–brain markers and alter gut microbiota composition in ApoE-/- rats, suggesting that SCFAs also could counteract lipid disorders-related diseases.
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7
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Peavy G, Mayo AM, Avalos C, Rodriguez A, Shifflett B, Edland SD. Perceived Stress in Older Dementia Caregivers: Mediation by Loneliness and Depression. Am J Alzheimers Dis Other Demen 2022; 37:15333175211064756. [PMID: 34986661 PMCID: PMC10580727 DOI: 10.1177/15333175211064756] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Coupled with aging, chronic stress experienced by dementia caregivers often leads to deteriorating health. Comparing caregivers and non-caregivers, we tested whether depression and loneliness mediate the relationship between caregiver status and a measure of chronic stress, the Perceived Stress Scale. Seventy-six cognitively normal older adults (mean age 72.7) were identified as caregivers or non-caregivers based on the functional independence of a paired family member. Caregivers reported more perceived stress, depression, and loneliness than non-caregivers. Using multiple mediation analyses, we found that loneliness and depression mediated the relationship of caregiver status with perceived stress. The loneliness effect on perceived stress was both direct and via its relationship with depressive symptoms. The findings suggest loneliness as a likely point of intervention to reduce caregiver stress. Initiatives to enable caregivers to maintain or develop social relationships apart from caregiver responsibilities may mitigate stress and its negative impact on mental and physical health.
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Affiliation(s)
- Guerry Peavy
- Department of Neurosciences, University of California, San Diego, La Jolla, CA, USA
| | - Ann M. Mayo
- Hahn School of Nursing and Health Science, University of San Diego, San Diego, CA, USA
| | - Cynthia Avalos
- Department of Neurosciences, University of California, San Diego, La Jolla, CA, USA
| | - Amanda Rodriguez
- Department of Neurosciences, University of California, San Diego, La Jolla, CA, USA
| | - Benjamin Shifflett
- Department of Neurosciences, University of California, San Diego, La Jolla, CA, USA
| | - Steven D. Edland
- School of Public Health and Human Longevity Research, University of California, San Diego, La Jolla, CA, USA
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8
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Brandner S, Schroeter S, Çalışkan G, Salar S, Kobow K, Coras R, Blümcke I, Hamer H, Schwarz M, Buchfelder M, Maslarova A. Glucocorticoid modulation of synaptic plasticity in the human temporal cortex of epilepsy patients: Does chronic stress contribute to memory impairment? Epilepsia 2021; 63:209-221. [PMID: 34687218 DOI: 10.1111/epi.17107] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 10/11/2021] [Accepted: 10/11/2021] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Memory impairment is common in patients with temporal lobe epilepsy and seriously affects life quality. Chronic stress is a recognized cofactor in epilepsy and can also impair memory function. Furthermore, increased cortisol levels have been reported in epilepsy patients. Animal models have suggested that aggravating effects of stress on memory and synaptic plasticity were mediated via glucocorticoids. The aim of this study was, therefore, to investigate the effect of glucocorticoid receptor (GR) modulation on synaptic plasticity in the human cortex of epilepsy patients. METHODS We performed field potential recordings in acute slices from the temporal neocortex of patients who underwent surgery for drug-resistant temporal lobe epilepsy. Synaptic plasticity was investigated by a theta-burst stimulation (TBS) protocol for induction of long-term potentiation (LTP) in the presence of GR modulators. RESULTS LTP was impaired in temporal cortex from epilepsy patients. Pretreatment of the slices with the GR antagonist mifepristone (RU486) improved LTP induction, suggesting that LTP impairment was due to baseline GR activation in the human cortex. The highly potent GR agonist dexamethasone additionally weakened synaptic strength in an activity-dependent manner when applied after TBS. SIGNIFICANCE Our results show a direct negative glucocorticoid effect on synaptic potentiation in the human cortex and imply chronic activation of GRs. Chronic stress may therefore contribute to memory impairment in patients with temporal lobe epilepsy. Furthermore, the activity-dependent acute inhibitory effect of dexamethasone suggests a mechanism of synaptic downscaling by which postictally increased cortisol levels may prevent pathologic plasticity upon seizures.
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Affiliation(s)
- Sebastian Brandner
- Department of Neurosurgery, Erlangen University Hospital, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Sarah Schroeter
- Department of Neurosurgery, Erlangen University Hospital, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany.,Department of Orthopedic, Trauma, and Hand Surgery, Osnabrück Clinic, Osnabrück, Germany
| | - Gürsel Çalışkan
- Department of Genetics and Molecular Neurobiology, Institute of Biology, Otto von Guericke University Magdeburg, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany
| | - Seda Salar
- Department of Psychiatry and Psychotherapy, Erlangen University Hospital, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Katja Kobow
- Department of Neuropathology, Erlangen University Hospital, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Roland Coras
- Department of Neuropathology, Erlangen University Hospital, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Ingmar Blümcke
- Department of Neuropathology, Erlangen University Hospital, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Hajo Hamer
- Department of Neurology, Epilepsy Center, Erlangen University Hospital, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Michael Schwarz
- Department of Neurology, Epilepsy Center, Erlangen University Hospital, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Michael Buchfelder
- Department of Neurosurgery, Erlangen University Hospital, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Anna Maslarova
- Department of Neurosurgery, Erlangen University Hospital, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
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9
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Harrell ER, Bui C, Newman SD. A Mixed-Effects Model of Associations between Interleukin-6 and Hippocampal Volume. J Gerontol A Biol Sci Med Sci 2021; 77:683-688. [PMID: 34637514 DOI: 10.1093/gerona/glab313] [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: 04/22/2021] [Indexed: 11/12/2022] Open
Abstract
Previous studies report hippocampal volume loss can help predict conversion from normative aging to mild cognitive impairment (MCI) to dementia. Additionally, a growing literature indicates that stress-related allostatic load may increase disease vulnerability. The current study examined the relationship between stress related cytokines (i.e., interleukin-6 - IL-6), cognition as measured by Mini Mental Status scores (MMSE), and hippocampal volume. Mixed-models were employed to examine both within (across time) and between subjects effects of IL-6 and hippocampal volume on MMSE score among 566 participants from the Alzheimer's Disease Neuroimaging Initiative (ADNI). The within subjects analysis found left hippocampal volume significantly (p= .009) predicted MMSE score. Between subjects analysis found the effect of IL-6 on MMSE was moderated by right hippocampal volume (p = .001). These results replicate previous findings and also extend prior work demonstrating stress-related cytokines may play a role in Alzheimer's disease (AD) progression.
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Affiliation(s)
- Erin R Harrell
- Department of Psychology, University of Alabama, Tuscaloosa, United States of America
| | - Chuong Bui
- Alabama Life Research Institute, University of Alabama, Tuscaloosa, United States of America
| | - Sharlene D Newman
- Department of Psychology, University of Alabama, Tuscaloosa, United States of America.,Alabama Life Research Institute, University of Alabama, Tuscaloosa, United States of America
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10
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Lin YF, Wang LY, Chen CS, Li CC, Hsiao YH. Cellular senescence as a driver of cognitive decline triggered by chronic unpredictable stress. Neurobiol Stress 2021; 15:100341. [PMID: 34095365 PMCID: PMC8163993 DOI: 10.1016/j.ynstr.2021.100341] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 05/06/2021] [Accepted: 05/10/2021] [Indexed: 12/13/2022] Open
Abstract
When an individual is under stress, the undesired effect on the brain often exceeds expectations. Additionally, when stress persists for a long time, it can trigger serious health problems, particularly depression. Recent studies have revealed that depressed patients have a higher rate of brain aging than healthy subjects and that depression increases dementia risk later in life. However, it remains unknown which factors are involved in brain aging triggered by chronic stress. The most critical change during brain aging is the decline in cognitive function. In addition, cellular senescence is a stable state of cell cycle arrest that occurs because of damage and/or stress and is considered a sign of aging. We used the chronic unpredictable stress (CUS) model to mimic stressful life situations and found that, compared with nonstressed control mice, CUS-treated C57BL/6 mice exhibited depression-like behaviors and cognitive decline. Additionally, the protein expression of the senescence marker p16INK4a was increased in the hippocampus, and senescence-associated β-galactosidase (SA-β-gal)-positive cells were found in the hippocampal dentate gyrus (DG) in CUS-treated mice. Furthermore, the levels of SA-β-gal or p16INK4a were strongly correlated with the severity of memory impairment in CUS-treated mice, whereas clearing senescent cells using the pharmacological senolytic cocktail dasatinib plus quercetin (D + Q) alleviated CUS-induced cognitive deficits, suggesting that targeting senescent cells may be a promising candidate approach to study chronic stress-induced cognitive decline. Our findings open new avenues for stress-related research and provide new insight into the association of chronic stress-induced cellular senescence with cognitive deficits.
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Affiliation(s)
- Yu-Fen Lin
- Department of Pharmacology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Li-Yun Wang
- Department of Pharmacology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chi-Sheng Chen
- Department of Pharmacology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chia-Chun Li
- Department of Pharmacology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Ya-Hsin Hsiao
- Department of Pharmacology, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Institute of Behavioral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
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11
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Ávila-Villanueva M, Gómez-Ramírez J, Maestú F, Venero C, Ávila J, Fernández-Blázquez MA. The Role of Chronic Stress as a Trigger for the Alzheimer Disease Continuum. Front Aging Neurosci 2020; 12:561504. [PMID: 33192456 PMCID: PMC7642953 DOI: 10.3389/fnagi.2020.561504] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 09/04/2020] [Indexed: 01/18/2023] Open
Affiliation(s)
- Marina Ávila-Villanueva
- Alzheimer Disease Research Unit, CIEN Foundation, Carlos III Institute of Health, Queen Sofía Foundation Alzheimer Center, Madrid, Spain
| | - Jaime Gómez-Ramírez
- Alzheimer Disease Research Unit, CIEN Foundation, Carlos III Institute of Health, Queen Sofía Foundation Alzheimer Center, Madrid, Spain
| | - Fernando Maestú
- Laboratory of Cognitive and Computational Neuroscience (UCM-UPM), Center for Biomedical Technology, Campus de Montegancedo, Madrid, Spain.,Department of Experimental Psychology, Complutense University of Madrid (UCM), Campus de Somosaguas, Madrid, Spain
| | - César Venero
- Department of Psychobiology, Universidad Nacional de Educación a Distancia (UNED), Madrid, Spain
| | - Jesús Ávila
- Center of Molecular Biology Severo Ochoa (CSIC-UAM), Campus de Cantoblanco, Madrid, Spain.,Network Center for Biomedical Research in Neurodegenerative Diseases (CIBERNED), Madrid, Spain
| | - Miguel A Fernández-Blázquez
- Alzheimer Disease Research Unit, CIEN Foundation, Carlos III Institute of Health, Queen Sofía Foundation Alzheimer Center, Madrid, Spain
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12
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Coogan P, Schon K, Li S, Cozier Y, Bethea T, Rosenberg L. Experiences of racism and subjective cognitive function in African American women. ALZHEIMER'S & DEMENTIA (AMSTERDAM, NETHERLANDS) 2020; 12:e12067. [PMID: 32782921 PMCID: PMC7409101 DOI: 10.1002/dad2.12067] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 06/05/2020] [Accepted: 06/17/2020] [Indexed: 12/27/2022]
Abstract
INTRODUCTION We hypothesized that frequent experiences of racism among African American women would adversely affect subjective cognitive function (SCF), based on the established association of psychological stress with memory decline. METHODS We used multinomial logistic regression to quantify the association between experiences of racism and SCF, based on six questions, among 17,320 participants in the prospective Black Women's Health Study. RESULTS The multivariable odds ratio (OR, 95% confidence interval [CI]) for poor compared to good SCF among women at the highest versus the lowest level of daily racism (eg, poorer service in stores) was 2.75 (2.34 to 3.23); for the same comparison among women at the highest level of institutional racism (eg, discriminated against in housing) relative to the lowest, the OR was 2.66 (2.24 to 3.15). The associations were mediated, in part, by depression and insomnia. DISCUSSION Experiences of racism, a highly prevalent psychosocial stressor among African Americans, were associated with lower SCF.
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Affiliation(s)
- Patricia Coogan
- Slone Epidemiology Center at Boston UniversityBostonMassachusettsUSA
| | - Karin Schon
- Department of Anatomy and NeurobiologyBoston University School of MedicineBostonMassachusettsUSA
| | - Shanshan Li
- Slone Epidemiology Center at Boston UniversityBostonMassachusettsUSA
| | - Yvette Cozier
- Slone Epidemiology Center at Boston UniversityBostonMassachusettsUSA
| | - Traci Bethea
- Department of Oncology, Office of Minority Health and Health Disparities ResearchGeorgetown University School of MedicineWashingtonDCUSA
| | - Lynn Rosenberg
- Slone Epidemiology Center at Boston UniversityBostonMassachusettsUSA
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13
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Ebaid D, Crewther SG. Time for a Systems Biological Approach to Cognitive Aging?-A Critical Review. Front Aging Neurosci 2020; 12:114. [PMID: 32477097 PMCID: PMC7236912 DOI: 10.3389/fnagi.2020.00114] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 04/06/2020] [Indexed: 12/19/2022] Open
Abstract
The underlying premise of current theories of cognitive decline with age tend to be primarily cognitive or biological explanations, with relatively few theories adequately integrating both aspects. Though literature has also emphasized the importance of several factors that contribute to cognitive aging including: (a) decline in sensory abilities; (b) the effect of motor speed on paper-pencil measures of cognitive speed; (c) the impact of level of education and physical activity; and (d) molecular biological changes that occur with age, these factors have seldom been implicated into any single theoretical model of cognitive aging. Indeed, such an integrated bio-cognitive model of aging has the potential to provide a more comprehensive understanding of attention, perception, learning, and memory across the lifespan. Thus, the aim of this review was to critically evaluate common theories of age-related cognitive decline and highlight the need for a more comprehensive systems neuroscience approach to cognitive aging.
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Affiliation(s)
- Deena Ebaid
- Department of Psychology and Counselling, School of Psychology and Public Health, College of Science, Health and Engineering, La Trobe University, Melbourne, VIC, Australia
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14
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Rashidi-Ranjbar N, Miranda D, Butters MA, Mulsant BH, Voineskos AN. Evidence for Structural and Functional Alterations of Frontal-Executive and Corticolimbic Circuits in Late-Life Depression and Relationship to Mild Cognitive Impairment and Dementia: A Systematic Review. Front Neurosci 2020; 14:253. [PMID: 32362808 PMCID: PMC7182055 DOI: 10.3389/fnins.2020.00253] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 03/06/2020] [Indexed: 01/12/2023] Open
Abstract
Depression is a risk factor for developing Alzheimer's disease and Related Dementia (ADRD). We conducted a systematic review between 2008 and October 2018, to evaluate the evidence for a conceptual mechanistic model linking depression and ADRD, focusing on frontal-executive and corticolimbic circuits. We focused on two neuroimaging modalities: diffusion-weighted imaging measuring white matter tract disruptions and resting-state functional MRI measuring alterations in network dynamics in late-life depression (LLD), mild cognitive impairment (MCI), and LLD+MCI vs. healthy control (HC) individuals. Our data synthesis revealed that in some but not all studies, impairment of both frontal-executive and corticolimbic circuits, as well as impairment of global brain topology was present in LLD, MCI, and LLD+MCI vs. HC groups. Further, posterior midline regions (posterior cingulate cortex and precuneus) appeared to have the most structural and functional alterations in all patient groups. Future cohort and longitudinal studies are required to address the heterogeneity of findings, and to clarify which subgroups of people with LLD are at highest risk for developing MCI and ADRD.
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Affiliation(s)
- Neda Rashidi-Ranjbar
- Institute of Medical Science, University of Toronto, Toronto, ON, Canada.,Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Dayton Miranda
- Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Meryl A Butters
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States
| | - Benoit H Mulsant
- Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada.,Department of Psychiatry, University of Toronto, Toronto, ON, Canada
| | - Aristotle N Voineskos
- Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada.,Department of Psychiatry, University of Toronto, Toronto, ON, Canada
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15
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Wiels W, Baeken C, Engelborghs S. Depressive Symptoms in the Elderly-An Early Symptom of Dementia? A Systematic Review. Front Pharmacol 2020; 11:34. [PMID: 32116710 PMCID: PMC7020568 DOI: 10.3389/fphar.2020.00034] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 01/14/2020] [Indexed: 12/28/2022] Open
Abstract
Background Depression and dementia are common incapacitating diseases in old age. The exact nature of the relationship between these conditions remains unclear, and multiple explanations have been suggested: depressive symptoms may be a risk factor for, a prodromal symptom of, or a coincidental finding in dementia. They may even be unrelated or only connected through common risk factors. Multiple studies so far have provided conflicting results. Objectives To determine whether a systematic literature review can clarify the nature of the relation between depressive symptoms and dementia. Methods Using the Patient/Problem/Population, Intervention, Comparator, Outcome or PICO paradigm, a known framework for framing healthcare and evidence questions, we formulated the question “whether depressive symptoms in cognitively intact older adults are associated with a diagnosis of dementia later in life.” We performed a systematic literature review of MEDLINE and PsycINFO in November 2018, looking for prospective cohort studies examining the aforementioned question. Results We critically analyzed and listed 31 relevant papers out of 1,656 and grouped them according to the main hypothesis they support: depressive symptoms as a risk factor, not a risk factor, a prodromal symptom, both, or some specific other hypothesis. All but three studies used clinical diagnostic criteria for dementia alone (i.e., no biomarkers or autopsy confirmation). Several studies contain solid arguments for the hypotheses they support, yet they do not formally contradict other findings or suggested explanations and are heterogeneous. Conclusions The exact nature of the relationship between depressive symptoms and dementia in the elderly remains inconclusive, with multiple studies supporting both the risk factor and prodromal hypotheses. Some provide arguments for common risk factors. It seems unlikely that there is no connection at all. We conclude that at least in a significant part of the patients, depressive symptoms and dementia are related. This may be due to common risk factors and/or depressive symptoms being a prodromal symptom of dementia and/or depression being a risk factor for dementia. These causal associations possibly overlap in some patients. Further research is warranted to develop predictive biomarkers and to develop interventions that may attenuate the risk of “conversion” from depressive symptoms to dementia in the elderly.
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Affiliation(s)
- Wietse Wiels
- Department of Neurology, Universitair Ziekenhuis Brussel, Brussels, Belgium.,Center for Neurosciences (C4N), Vrije Universiteit Brussel, Brussels, Belgium
| | - Chris Baeken
- Center for Neurosciences (C4N), Vrije Universiteit Brussel, Brussels, Belgium.,Department of Psychiatry, Universitair Ziekenhuis Brussel, Brussels, Belgium.,Ghent Experimental Psychiatry (GHEP) Lab, Department of Psychiatry and Medical Psychology, Ghent University Hospital, Ghent University, Ghent, Belgium.,Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
| | - Sebastiaan Engelborghs
- Department of Neurology, Universitair Ziekenhuis Brussel, Brussels, Belgium.,Center for Neurosciences (C4N), Vrije Universiteit Brussel, Brussels, Belgium.,Department of Biomedical Sciences and Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
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16
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Microglia, Lifestyle Stress, and Neurodegeneration. Immunity 2020; 52:222-240. [PMID: 31924476 DOI: 10.1016/j.immuni.2019.12.003] [Citation(s) in RCA: 175] [Impact Index Per Article: 43.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 11/26/2019] [Accepted: 12/09/2019] [Indexed: 02/06/2023]
Abstract
Recent years have witnessed a revolution in our understanding of microglia biology, including their major role in the etiology and pathogenesis of neurodegenerative diseases. Technological advances have enabled the identification of microglial signatures in health and disease, including the development of new models to investigate and manipulate human microglia in vivo in the context of disease. In parallel, genetic association studies have identified several gene risk factors associated with Alzheimer's disease that are specifically or highly expressed by microglia in the central nervous system (CNS). Here, we discuss evidence for the effect of stress, diet, sleep patterns, physical activity, and microbiota composition on microglia biology and consider how lifestyle might influence an individual's predisposition to neurodegenerative diseases. We discuss how different lifestyles and environmental factors might regulate microglia, potentially leading to increased susceptibility to neurodegenerative disease, and we highlight the need to investigate the contribution of modern environmental factors on microglia modulation in neurodegeneration.
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17
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Dominguez S, Rodriguez G, Fazelinia H, Ding H, Spruce L, Seeholzer SH, Dong H. Sex Differences in the Phosphoproteomic Profiles of APP/PS1 Mice after Chronic Unpredictable Mild Stress. J Alzheimers Dis 2020; 74:1131-1142. [PMID: 32144982 PMCID: PMC9843707 DOI: 10.3233/jad-191009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Approximately two-thirds of those suffering with Alzheimer's disease (AD) are women, however, the biological mechanisms underlying this sex divergence of AD prevalence remain unknown. Previous research has shown sex-specific biochemical differences that bias female mice toward pro-AD signaling on the phosphoproteomic level via corticotropin releasing factor (CRF) receptor 1 activation after CRF overexpression. Here we aimed to determine if chronic stress would induce a similar response in AD mouse models. We stressed 4-month-old APP/PS1 mice using a chronic unpredictable mild stress (CUMS) paradigm for up to 1 month. Following CUMS and behavioral assessments, we quantified whole protein and phosphoprotein levels in the cortex of stressed and non-stressed APP/PS1 mice using mass spectrometry-based proteomics. While there were no statistically significant differences at the total protein and peptide abundance levels, we found 909 and 841 statistically significant phosphopeptides between stressed and unstressed females and males, respectively, using a false discovery rate of 5%. Of these significant phosphopeptides, only 301 were the same in males and females. These results indicate that while both males and females undergo protein phosphorylation changes following stress, the peptides that are phosphorylated differ between sexes. We then used Metacore analysis to determine which biological pathways were affected. We found that several pathways were changed differently between male and female mice including NMDA receptor trafficking, cytoskeleton organization, and tau pathology. The differing biological pathways affected between males and females in response to chronic stress may help us to better understand why women are at a higher risk of AD.
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Affiliation(s)
- Sky Dominguez
- Department of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Guadalupe Rodriguez
- Department of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Hossein Fazelinia
- Proteomics Core, The Children’s Hospital of Philadelphia, Philadelphia, PA, USA
| | - Hua Ding
- Proteomics Core, The Children’s Hospital of Philadelphia, Philadelphia, PA, USA
| | - Lynn Spruce
- Proteomics Core, The Children’s Hospital of Philadelphia, Philadelphia, PA, USA
| | - Steven H. Seeholzer
- Proteomics Core, The Children’s Hospital of Philadelphia, Philadelphia, PA, USA
| | - Hongxin Dong
- Department of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, USA,Correspondence to: Hongxin Dong, MD, PhD, Feinberg School of Medicine, Department of Psychiatry and Behavioral Sciences, Northwestern University, 303 East Chicago Avenue, Chicago, IL 60611, USA.
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18
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James KA, Grace LK, Pan CY, Combrinck MI, Thomas KGF. Psychosocial stress associated with memory performance in older South African adults. AGING NEUROPSYCHOLOGY AND COGNITION 2019; 27:553-566. [PMID: 31419919 DOI: 10.1080/13825585.2019.1645809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Older adults with past or current chronic stress exposure perform poorly on memory assessments and are at higher risk for Alzheimer's disease (AD). In low- or middle-income countries, many older adults are, or have been, exposed to stress-provoking events. Few published studies examine such populations, however, and few take multiple measures of stress. In a sample of South African older adults with mild-to-moderate AD (n = 65) and healthy controls (n = 69), we assessed relations between stress (psychosocial and physiological), memory performance, and patient status. Participants, all aged > 60, were administered the Perceived Stress Scale (a questionnaire assessing subjective psychosocial stress) and the Cambridge Cognitive Examination-Revised (CAMCOG-R; a test battery measuring performance across several cognitive domains). We measured their salivary cortisol concentrations as a proxy for physiological stress. Patients reported significantly higher levels of psychosocial stress than controls, p = .008. Logistic regression showed that psychosocial stress, but not cortisol, predicted AD patient status. CAMCOG-R Memory subscale scores were significantly associated with psychosocial stress, r = -.18, p = .040, but not with cortisol levels. These findings are the first on the topic to emerge from a low-or middle-income country. We replicated findings from previous studies conducted in high-income countries, with data supporting predictions derived from the glucocorticoid cascade/neurotoxicity hypothesis. The results suggest that clinical interventions focused on increasing resilience of older adults to effects of chronic stress may help protect against declining memory performance and reduce the risk for AD.
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Affiliation(s)
- Katharine A James
- ACSENT Laboratory, Department of Psychology, University of Cape Town, Rondebosch, South Africa.,Division of Geriatric Medicine, Department of Medicine, University of Cape Town, Rondebosch, South Africa
| | - Laurian K Grace
- Division of Geriatric Medicine, Department of Medicine, University of Cape Town, Rondebosch, South Africa
| | - Chen Ying Pan
- ACSENT Laboratory, Department of Psychology, University of Cape Town, Rondebosch, South Africa
| | - Marc I Combrinck
- Division of Geriatric Medicine, Department of Medicine, University of Cape Town, Rondebosch, South Africa
| | - Kevin G F Thomas
- ACSENT Laboratory, Department of Psychology, University of Cape Town, Rondebosch, South Africa
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19
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Bower ES, Szajer J, Murphy C. Effect of Worry Level on Recall Memory for Odors in ApoE-ε4 Carriers and Non-Carriers. J Int Neuropsychol Soc 2019; 25:546-556. [PMID: 30987686 PMCID: PMC6534430 DOI: 10.1017/s1355617719000158] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Increased levels of worry, age, and presence of the apolipoprotein-E (ApoE)-ε4 allele are associated with the risk of developing cognitive declines and Alzheimer's disease (AD). Odor memory performance has been shown to vary as a function of age and ApoE genotype, and odor memory tests are sensitive to preclinical AD. Worry is known to influence verbal memory; however, its effects on odor memory are unknown. This study aimed to assess the relationships between worry, age, and ε4 status on odor memory. METHOD Worry was evaluated for young (n = 53) and older (n = 45) adults using the Penn State Worry Questionnaire. Odor memory was assessed using the California Odor Learning Test, an olfactory analogue to the California Verbal Learning Test. RESULTS A significant main effect of worry on long-delay free recall was found, such that increasing worry was associated with better recall across age and ε4 status. A significant interaction effect between ε4 status and worry on both short-and long-delay cued recall was found, such that across age, higher worry was associated with increased cued recall scores among ε4-negative adults, and decreased scores among ε4-positive adults. CONCLUSIONS Findings demonstrated that worry influences odor memory and exerts a particular effect on cued recall among ε4 carriers who are at a greater risk of developing AD. Worry is a modifiable predictor of cognitive decline and risk of dementia in aging. Future studies on the effects of treatments aimed at reducing worry (e.g., cognitive behavioral therapies for anxiety) on changes in cognitive functioning are warranted.
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Affiliation(s)
- Emily S Bower
- Department of Psychology,San Diego State University,San Diego, California 92182,USA
| | - Jacquelyn Szajer
- SDSU/UCSD Joint Doctoral Program in Clinical Psychology,San Diego, California 92120,USA
| | - Claire Murphy
- Department of Psychology,San Diego State University,San Diego, California 92182,USA
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20
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The relationship between cortisol and cognitive function in healthy older people: The moderating role of Apolipoprotein E polymorphism. Neurobiol Learn Mem 2018; 155:297-305. [DOI: 10.1016/j.nlm.2018.08.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 08/02/2018] [Accepted: 08/17/2018] [Indexed: 01/24/2023]
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21
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Ross JA, Gliebus G, Van Bockstaele EJ. Stress induced neural reorganization: A conceptual framework linking depression and Alzheimer's disease. Prog Neuropsychopharmacol Biol Psychiatry 2018; 85:136-151. [PMID: 28803923 PMCID: PMC5809232 DOI: 10.1016/j.pnpbp.2017.08.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 08/04/2017] [Accepted: 08/06/2017] [Indexed: 12/29/2022]
Abstract
Chronic stress is a risk factor for a number of physiological disorders including cardiovascular disease, obesity and gastrointestinal disorders, as well as psychiatric and neurodegenerative disorders. There are a number of underlying molecular and cellular mechanisms altered in the course of chronic stress, which may increase the vulnerability of individuals to develop psychiatric disorders such as depression, and neurodegenerative disorders such as Alzheimer's Disease (AD). This is evident in the influence of stress on large-scale brain networks, including the resting state Default Mode Network (DMN), the effects of stress on neuronal circuitry and architecture, and the cellular and molecular adaptations to stress, which may render individuals with stress related psychiatric disorders more vulnerable to neurodegenerative disease later in life. These alterations include decreased negative feedback inhibition of the hypothalamic pituitary axis (HPA) axis, decreased dendritic arborization and spine density in the prefrontal cortex (PFC) and hippocampus, and the release of proinflammatory cytokines, which may suppress neurogenesis and promote neuronal cell death. Each of these factors are thought to play a role in stress-related psychiatric disease as well as AD, and have been observed in clinical and post-mortem studies of individuals with depression and AD. The goal of the current review is to summarize clinical and preclinical evidence supporting a role for chronic stress as a putative link between neuropsychiatric and neurodegenerative disease. Moreover, we provide a rationale for the importance of taking a medical history of stress-related psychiatric diseases into consideration during clinical trial design, as they may play an important role in the etiology of AD in stratified patient populations.
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Affiliation(s)
- Jennifer A. Ross
- Department of Pharmacology and Physiology, College of Medicine, Drexel University, Philadelphia, PA 19102
| | - Gediminas Gliebus
- Department of Neurology, Drexel Neuroscience Institute, Philadelphia, PA 19107
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22
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Rönnlund M, Åström E, Adolfsson R, Carelli MG. Perceived Stress in Adults Aged 65 to 90: Relations to Facets of Time Perspective and COMT Val 158Met Polymorphism. Front Psychol 2018; 9:378. [PMID: 29623060 PMCID: PMC5874313 DOI: 10.3389/fpsyg.2018.00378] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 03/07/2018] [Indexed: 01/08/2023] Open
Abstract
This study examined the relation between perceived stress and time perspective (views of past, present, future) in a population-based sample of older adults (65–90 years, N = 340). The Perceived Questionnaire (PSQ index) was used to measure stress and the Swedish version of the Zimbardo Time Perspective Inventory (S-ZTPI) was used to operationalize time perspective. Unlike the original inventory, S-ZTPI separates positive and negative aspects of a future time perspective and we hypothesized that the Future Negative (FN) scale would be important to account for variations in stress. Additionally, associations with Catechol-O-methyltransferase (COMT) Val158Met polymorphism were examined, motivated by prior associations of this single nucleotide polymorphism (SNP) with stress (or “anxiety”) related personality traits. In line with the hypotheses, FN was the strongest predictor of PSQ index scores in multiple regression analyses. In a related vein, the dichotomization of the unitary Future scale increased the association between PSQ scores and a measure of deviations from a balanced time perspective, i.e., the difference between a proposed optimal and observed ZTPI profile. Finally, higher levels of stress as well as higher scores on FN were observed in COMT Val/Val carriers, at least among men. This suggests a shared dopaminergic genetic influence on these variables. Collectively, the results demonstrate that perceived stress is closely linked to time perspective and highlight the need to take negative aspects of a future temporal orientation into account to understand this relation.
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Affiliation(s)
| | | | - Rolf Adolfsson
- Department of Clinical Science, Division of Psychiatry, Umeå University, Umeå, Sweden
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23
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Zannas AS. Gene-environment Interactions in Late Life: Linking Psychosocial Stress with Brain Aging. Curr Neuropharmacol 2018; 16:327-333. [PMID: 29119927 PMCID: PMC5843983 DOI: 10.2174/1570159x15666171109121452] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 08/22/2017] [Accepted: 11/07/2017] [Indexed: 01/01/2023] Open
Abstract
Gene-environment interactions (GxE) can have lasting consequences on brain structure and function, potentially contributing to diverse neuropsychiatric phenotypes. This has been extensively demonstrated by studies examining GxE in childhood and early adulthood, whereas much fewer studies have addressed this question in late life. The relative paucity of studies examining GxE in late life may stem from the working hypothesis that brains become less malleable to environmental inputs as life progresses. However, while some components of brain plasticity decline with increasing age, others are retained and may even become more pronounced in old ages. Moreover, the micro- and macro-structural brain changes that accrue as a result of aging-related morbidities are likely to accentuate the susceptibility of neural circuits to environmental stressors as life advances. Supporting this hypothesis, psychosocial stress can increase the risk for late-life neuropsychiatric syndromes, especially when afflicting genetically predisposed individuals. This article reviews evidence showing how gene-stress interactions can impact the aging brain and related phenotypes in late life, and it discusses the potential mechanisms underlying such GxE and their implications for the prevention and treatment of late-life neuropsychiatric syndromes.
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Affiliation(s)
- Anthony S. Zannas
- Address correspondence to this author at the Department of Translational Research in Psychiatry, Max Planck Institute of Psychiatry, Kraepelinstrasse 2-10, Munich, 80804, Germany; Tel: +498930622567; E-mail:
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24
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Kennedy G, Hardman RJ, Macpherson H, Scholey AB, Pipingas A. How Does Exercise Reduce the Rate of Age-Associated Cognitive Decline? A Review of Potential Mechanisms. J Alzheimers Dis 2018; 55:1-18. [PMID: 27636853 DOI: 10.3233/jad-160665] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The rate of age-associated cognitive decline varies considerably between individuals. It is important, both on a societal and individual level, to investigate factors that underlie these differences in order to identify those which might realistically slow cognitive decline. Physical activity is one such factor with substantial support in the literature. Regular exercise can positively influence cognitive ability, reduce the rate of cognitive aging, and even reduce the risk of Alzheimer's disease (AD) and other dementias. However, while there is substantial evidence in the extant literature for the effect of exercise on cognition, the processes that mediate this relationship are less clear. This review examines cardiovascular health, production of brain derived neurotrophic factor (BDNF), insulin sensitivity, stress, and inflammation as potential pathways, via which exercise may maintain or improve cognitive functioning, and may be particularly pertinent in the context of the aging brain. A greater understanding of these mechanisms and their potential relationships with exercise and cognition will be invaluable in providing biomarkers for investigating the efficacy of differing exercise regimes on cognitive outcomes.
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Affiliation(s)
- Greg Kennedy
- Centre for Human Psychopharmacology, Swinburne University of Technology, Melbourne, VIC, Australia
| | - Roy J Hardman
- Centre for Human Psychopharmacology, Swinburne University of Technology, Melbourne, VIC, Australia
| | - Helen Macpherson
- Centre for Human Psychopharmacology, Swinburne University of Technology, Melbourne, VIC, Australia.,Centre for Physical Activity and Nutrition Research, Deakin University, Melbourne, VIC, Australia
| | - Andrew B Scholey
- Centre for Human Psychopharmacology, Swinburne University of Technology, Melbourne, VIC, Australia
| | - Andrew Pipingas
- Centre for Human Psychopharmacology, Swinburne University of Technology, Melbourne, VIC, Australia
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25
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Mota NP, Han S, Harpaz-Rotem I, Maruff P, Krystal JH, Southwick SM, Gelernter J, Pietrzak RH. Apolipoprotein E gene polymorphism, trauma burden, and posttraumatic stress symptoms in U.S. military veterans: Results from the National Health and Resilience in Veterans Study. Depress Anxiety 2018; 35:168-177. [PMID: 29172227 PMCID: PMC5794529 DOI: 10.1002/da.22698] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 08/11/2017] [Accepted: 10/05/2017] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Previous research examining the association between apolipoprotein E (APOE) gene polymorphism and risk for posttraumatic stress disorder (PTSD) has been inconsistent due to the use of small and select samples. This study examined the relation between APOE genotype and PTSD symptoms in two nationally representative samples of U.S. military veterans. The potential effect of cumulative trauma burden and social support in moderating this association was also evaluated. METHODS The main sample consisted of 1,386 trauma-exposed European American (EA) veterans (mean age: 62-63 years) who participated in the National Health and Resilience in Veterans Study (NHRVS) in 2011. The independent replication sample consisted of 509 trauma-exposed EA veterans from the 2013 NHRVS. RESULTS APOE ε4 allele carriers reported significantly greater severity of PTSD symptoms than noncarriers in the main, but not the replication, sample. In both samples, the interaction of APOE ε4 carrier status and cumulative trauma burden was associated with greater severity of PTSD symptoms (F range = 2.53-8.09, all P's < .01), particularly re-experiencing/intrusion symptoms (F range = 3.59-4.24, P's < .001). Greater social support was associated with lower severity of PTSD symptoms among APOE ε4 allele carriers with greater cumulative trauma burden (β range -.27 to -.60, P's < .05). CONCLUSION U.S. military veterans who are APOE ε4 allele carriers and exposed to a high number of traumas may be at increased risk for developing PTSD symptoms than ε4 noncarriers. Greater social support may moderate this association, thereby highlighting the potential importance of social support promoting interventions in mitigating the effect of ε4 × cumulative trauma burden on PTSD risk.
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Affiliation(s)
- Natalie P. Mota
- Department of Clinical Health Psychology, Max Rady College of Medicine, University of Manitoba, Canada
| | - Shizhong Han
- Department of Psychiatry, University of Iowa Carver College of Medicine,Iowa City, Iowa, USA
| | - Ilan Harpaz-Rotem
- Clinical Neurosciences Division, U.S. Department of Veterans Affairs National Center for PTSD, VA Connecticut Healthcare System, West Haven, CT, USA,Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Paul Maruff
- Florey Institute of Neuroscience and Mental Health, University of Melbourne and Cogstate, Ltd., Melbourne, Australia
| | - John H. Krystal
- Clinical Neurosciences Division, U.S. Department of Veterans Affairs National Center for PTSD, VA Connecticut Healthcare System, West Haven, CT, USA,Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Steven M. Southwick
- Clinical Neurosciences Division, U.S. Department of Veterans Affairs National Center for PTSD, VA Connecticut Healthcare System, West Haven, CT, USA,Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Joel Gelernter
- Clinical Neurosciences Division, U.S. Department of Veterans Affairs National Center for PTSD, VA Connecticut Healthcare System, West Haven, CT, USA,Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Robert H. Pietrzak
- Clinical Neurosciences Division, U.S. Department of Veterans Affairs National Center for PTSD, VA Connecticut Healthcare System, West Haven, CT, USA,Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
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26
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Burke SL, Maramaldi P, Cadet T, Kukull W. Decreasing hazards of Alzheimer's disease with the use of antidepressants: mitigating the risk of depression and apolipoprotein E. Int J Geriatr Psychiatry 2018; 33:200-211. [PMID: 28560728 PMCID: PMC5711617 DOI: 10.1002/gps.4709] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 03/02/2017] [Indexed: 01/01/2023]
Abstract
OBJECTIVE Alzheimer's disease (AD) is a neurodegenerative disease, manifesting in clinically observable deficits in memory, thinking, and behavior that disproportionately affects older adults. Susceptibility genes, such as apolipoprotein ε4, have long been associated with an increased risk of AD diagnosis. Studies have shown associations between depression and increased risk of AD development. Furthermore, findings from previous investigations suggest mixed effects in the use of psychotropic medication in older adults. The hypothesis for this study is that antidepressant use modifies the increased hazard of depression or such that a non-significant hazard will result with respect to eventual AD development. METHODS Utilizing data from the National Alzheimer's Coordinating Center, we examined evaluations of 11,443 cognitively intact participants. Survival analysis was used to explore relationships between depression, apolipoprotein E, AD diagnosis, and antidepressant use. RESULTS An analytical sample of 8732 participants with normal cognition was examined. Among users of antidepressant medication, the hazard, in most cases, was no longer statistically significant. One generic medication showed protective benefits for users (p < 0.001). In addition, there was a statistically significant relationship between recent depression (n = 2083; p < 0.001), lifetime depression (n = 2068; p < 0.05), and ε4 carrier status (n = 2470; p < 0.001) and AD development. CONCLUSIONS The findings suggest that a mechanism related to antidepressant use may reduce the hazard of eventual AD. Furthermore, the findings reinforce the association between depression, apolipoprotein E (APOE) ε4, and AD diagnosis. This study contributes to the emerging literature exploring interventions aimed at decreasing the risk of AD by targeting potentially modifiable psychosocial risk factors such as depression. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Shanna L Burke
- Robert Stempel College of Public Health and Social Work, School of Social Work, Florida International University, Miami, FL, USA
| | - Peter Maramaldi
- Simmons College School of Social Work, Boston, MA, USA
- Oral Health Policy and Epidemiology, Harvard School of Dental Medicine, Boston, MA, USA
- Department of Social and Behavioral Sciences, Harvard T. H. Chan School of Public Health, Boston, MA, USA
| | - Tamara Cadet
- Simmons College School of Social Work, Boston, MA, USA
- Oral Health Policy and Epidemiology, Harvard School of Dental Medicine, Boston, MA, USA
| | - Walter Kukull
- Department of Epidemiology, University of Washington, Seattle, WA, USA
- National Alzheimer's Coordinating Center, University of Washington, Seattle, WA
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Babenko VN, Smagin DA, Kudryavtseva NN. RNA-Seq Mouse Brain Regions Expression Data Analysis: Focus on ApoE Functional Network. J Integr Bioinform 2017; 14:/j/jib.ahead-of-print/jib-2017-0024/jib-2017-0024.xml. [PMID: 28902624 PMCID: PMC6042815 DOI: 10.1515/jib-2017-0024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 08/21/2017] [Indexed: 12/17/2022] Open
Abstract
ApoE expression status was proved to be a highly specific marker of energy metabolism rate in the brain. Along with its neighbor, Translocase of Outer Mitochondrial Membrane 40 kDa (TOMM40) which is involved in mitochondrial metabolism, the corresponding genomic region constitutes the neuroenergetic hotspot. Using RNA-Seq data from a murine model of chronic stress a significant positive expression coordination of seven neighboring genes in ApoE locus in five brain regions was observed. ApoE maintains one of the highest absolute expression values genome-wide, implying that ApoE can be the driver of the neighboring gene expression alteration observed under stressful loads. Notably, we revealed the highly statistically significant increase of ApoE expression in the hypothalamus of chronically aggressive (FDR < 0.007) and defeated (FDR < 0.001) mice compared to the control. Correlation analysis revealed a close association of ApoE and proopiomelanocortin (Pomc) gene expression profiles implying the putative neuroendocrine stress response background of ApoE expression elevation therein.
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Affiliation(s)
- Vladimir N Babenko
- Modeling Neuropathology Laboratory, Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
| | - Dmitry A Smagin
- Modeling Neuropathology Laboratory, Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
| | - Natalia N Kudryavtseva
- Modeling Neuropathology Laboratory, Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
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Alkadhi KA. Exercise as a Positive Modulator of Brain Function. Mol Neurobiol 2017; 55:3112-3130. [PMID: 28466271 DOI: 10.1007/s12035-017-0516-4] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Accepted: 04/04/2017] [Indexed: 12/24/2022]
Abstract
Various forms of exercise have been shown to prevent, restore, or ameliorate a variety of brain disorders including dementias, Parkinson's disease, chronic stress, thyroid disorders, and sleep deprivation, some of which are discussed here. In this review, the effects on brain function of various forms of exercise and exercise mimetics in humans and animal experiments are compared and discussed. Possible mechanisms of the beneficial effects of exercise including the role of neurotrophic factors and others are also discussed.
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Affiliation(s)
- Karim A Alkadhi
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, 77204, USA.
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Kelley KD, Peavy G, Edland S, Rogers W, Riley DE, Bordelon Y, Standaert D, Reich SG, Litvan I. The Role of Stress as a Risk Factor for Progressive Supranuclear Palsy. JOURNAL OF PARKINSON'S DISEASE 2017; 7:377-383. [PMID: 28409749 PMCID: PMC5952610 DOI: 10.3233/jpd-160945] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND PSP, like Alzheimer's disease (AD), is a tauopathy. The etiopathogenesis of PSP is not well known and the role of stress has not yet been examined. Recent studies have shown that stress increases the risk for developing AD. This study investigates the role of stress as a risk factor for PSP. OBJECTIVE B To examine the association between the development of progressive supranuclear palsy (PSP) and self-reported life stressors. METHODS 76 patients diagnosed with PSP according to the NINDS-SPSP criteria and 68 age-matched unrelated controls were administered a life stressor questionnaire. Stress was quantified as total number of events, number of life changing events, and number of events characterized by self-rated severity. Conditional odds ratio (OR) was calculated for each measure, with participants in the highest quartile of each measure being defined as high-exposure in relation to all other participants. RESULTS There were no significant differences between the reported number of total events or life-changing events in cases and controls. However, we found 24.4% of cases (N = 11) and 9.1% of controls (N = 5) had a higher exposure to high severity events, yielding an OR of 3.2 (p = 0.04). CONCLUSIONS We found that cases have over a three times greater odds of high exposure to high-severity events than controls prior to the clinical development of PSP, while there were no differences in overall number of reported events. Our findings suggest that high exposure to highly stressful events may be associated with the development of PSP.
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Affiliation(s)
| | - Guerry Peavy
- Department of Neurosciences, UC San Diego, La Jolla, CA, USA
| | - Steven Edland
- Department of Neurosciences, UC San Diego, La Jolla, CA, USA
| | - Whitney Rogers
- Department of Neuroscience Training, University of Louisville, Louisville, KY, USA
| | - David E. Riley
- Department of Neurology, Case Western Reserve University, Cleveland, OH, USA
| | - Yvette Bordelon
- Department of Neurology, University of California Los Angeles, Los Angeles, CA, USA
| | - David Standaert
- Department of Neurology, University of Alabama in Birmingham, Birmingham, AL, USA
| | - Stephen G. Reich
- Department of Neurology, University of Maryland, Baltimore, MD, USA
| | - Irene Litvan
- Department of Neurosciences, UC San Diego, La Jolla, CA, USA
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Burke SL, Maramaldi P, Cadet T, Kukull W. Associations between depression, sleep disturbance, and apolipoprotein E in the development of Alzheimer's disease: dementia. Int Psychogeriatr 2016; 28:1409-24. [PMID: 27020605 PMCID: PMC4963299 DOI: 10.1017/s1041610216000405] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Alzheimer's disease (AD) is a neurodegenerative brain disease that causes cognitive impairment and dementia. Within the US, AD is the most common form of dementia in the elderly, affecting 1 in 10 people over the age of 65. Sleep disturbance has been called a "public health epidemic" and, like depression, is a prodromal symptom of AD but may also contribute to the risk of developing AD. It was hypothesized that sleep disturbance, depression, and the apolipoprotein E (APOE) genotype increase the likelihood of AD. METHODS Utilizing data from the National Alzheimer's Coordinating Center, information from evaluations of 11,453 cognitively asymptomatic participants was analyzed. Survival analysis was used to explore the independent relationships between depression, sleep disturbance, and APOE genotypes with eventual AD diagnosis. Cox proportional hazard models were utilized to explore the main effects and synergistic effects of psychosocial factors as moderated by APOE genotypes. RESULTS This study reinforced the association between APOE and AD. The hazard of developing AD was eight times higher for those with recent depression and the Ɛ4 homozygote (HR = 8.15 [3.70-17.95]). Among Ɛ4 carriers with clinician-verified depression, the hazard was ten times that of the reference group (HR = 10.11 [4.43-23.09]). The hazard for Ɛ4 carriers reporting sleep disturbance was almost 7 times greater than the reference group (HR = 6.79 [2.38-19.37]). CONCLUSION Findings suggest that sleep disturbance, depression, and APOE Ɛ4 genotype are associated with AD during follow-up evaluations among a group of initially cognitively asymptomatic participants. This study contributes to the literature base exploring an increased hazard or risk of AD due to potential modifiable risk factors as well as genetic biomarkers, such as APOE.
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Affiliation(s)
- Shanna L Burke
- Florida International University,Robert Stempel College of Public Health and Social Work,School of Social Work,Miami,FL,USA
| | | | - Tamara Cadet
- Simmons College School of Social Work,Boston,MA,USA
| | - Walter Kukull
- National Alzheimer's Coordinating Center (NACC),University of Washington School of Public Health,Department of Epidemiology,Seattle,WA,USA
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ApoE2 Exaggerates PTSD-Related Behavioral, Cognitive, and Neuroendocrine Alterations. Neuropsychopharmacology 2015; 40:2443-53. [PMID: 25857685 PMCID: PMC4538360 DOI: 10.1038/npp.2015.95] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 01/23/2015] [Accepted: 03/31/2015] [Indexed: 01/05/2023]
Abstract
Apolipoprotein E (apoE) is an essential component of lipoprotein particles in both the brain and periphery, and exists in three isoforms in the human population: E2, E3, and E4. ApoE has numerous, well-established roles in neurobiology. Most notably, E4 is associated with earlier onset and increased risk of Alzheimer's disease (AD). Although possession of E2 is protective in the context of AD, E2 appears to confer an increased incidence and severity of posttraumatic stress disorder (PTSD). However, the biological processes underlying this link remain unclear. In this study, we began to elucidate these associations by examining the effects of apoE on PTSD severity in combat veterans, and on PTSD-like behavior in mice with human apoE. In a group of 92 veterans with PTSD, we observed significantly higher Clinician-Administered PTSD Scale and PTSD Checklist scores in E2+ individuals, as well as alterations in salivary cortisol levels. Furthermore, we measured behavioral and biological outcomes in mice expressing human apoE after a single stressful event as well as following a period of chronic variable stress, a model of combat-related trauma. Mice with E2 showed impairments in fear extinction, and behavioral, cognitive, and neuroendocrine alterations following trauma. To the best of our knowledge, these data constitute the first translational demonstration of PTSD severity in men and PTSD-like symptoms in mice with E2, and point to apoE as a novel biomarker of susceptibility, and potential therapeutic target, for PTSD.
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Hatch DJ, Schwartz S, Norton MC. Depression and antidepressant use moderate association between widowhood and Alzheimer's disease. Int J Geriatr Psychiatry 2015; 30:292-9. [PMID: 24798942 DOI: 10.1002/gps.4140] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 04/04/2014] [Indexed: 02/02/2023]
Abstract
OBJECTIVE In recent decades, biological evidence has implicated chronic stress in the etiology of Alzheimer's disease (AD). As a result, the relationship between widowhood, one of the most stressful life events, and AD has also received attention. This study extends this literature by investigating whether depression, which may indicate proneness to distress, and antidepressant use, which can protect against hippocampal shrinkage, moderate the relationship between widowhood and increased risk for AD. METHODS To investigate this, this study utilized data from the Cache County Memory Study, a large population-based epidemiological study of AD, and the Utah Population Database, one of the world's foremost linked genealogical databases, to regress AD on the interaction between widowhood and history of depression and antidepressant use. RESULTS In Cox regression analyses, history of depression and antidepressant use moderated the association between widowhood and AD (p = 0.007 and p = 0.006, respectively), in that widowhood was associated with 73% and 94% increased hazard of AD among those reporting depression (hazard ratio [HR] = 1.73, 95% confidence interval [CI]: 1.001 to 2.99) and those reporting antidepressant use (HR = 1.94, 95% CI: 1.13 to 3.33). A significant three-way interaction between widowhood, depression, and antidepressant use was also found (p = 0.02), showing depression to moderate the association between widowhood and AD only among those not using antidepressants (p = 0.02). CONCLUSIONS These findings advance clinical and scientific knowledge concerning the effects of widowhood on risk for AD and underscore the importance of depression and antidepressant use in understanding vulnerability to and protection from these effects.
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Affiliation(s)
- Daniel J Hatch
- Department of Psychology, Utah State University, Logan, UT, USA
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Du X, Pang TY. Is Dysregulation of the HPA-Axis a Core Pathophysiology Mediating Co-Morbid Depression in Neurodegenerative Diseases? Front Psychiatry 2015; 6:32. [PMID: 25806005 PMCID: PMC4353372 DOI: 10.3389/fpsyt.2015.00032] [Citation(s) in RCA: 112] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Accepted: 02/16/2015] [Indexed: 01/19/2023] Open
Abstract
There is increasing evidence of prodromal manifestation of neuropsychiatric symptoms in a variety of neurodegenerative diseases such as Parkinson's disease (PD) and Huntington's disease (HD). These affective symptoms may be observed many years before the core diagnostic symptoms of the neurological condition. It is becoming more apparent that depression is a significant modifying factor of the trajectory of disease progression and even treatment outcomes. It is therefore crucial that we understand the potential pathophysiologies related to the primary condition, which could contribute to the development of depression. The hypothalamic-pituitary-adrenal (HPA)-axis is a key neuroendocrine signaling system involved in physiological homeostasis and stress response. Disturbances of this system lead to severe hormonal imbalances, and the majority of such patients also present with behavioral deficits and/or mood disorders. Dysregulation of the HPA-axis is also strongly implicated in the pathology of major depressive disorder. Consistent with this, antidepressant drugs, such as the selective serotonin reuptake inhibitors have been shown to alter HPA-axis activity. In this review, we will summarize the current state of knowledge regarding HPA-axis pathology in Alzheimer's, PD and HD, differentiating between prodromal and later stages of disease progression when evidence is available. Both clinical and preclinical evidence will be examined, but we highlight animal model studies as being particularly useful for uncovering novel mechanisms of pathology related to co-morbid mood disorders. Finally, we purpose utilizing the preclinical evidence to better inform prospective, intervention studies.
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Affiliation(s)
- Xin Du
- Mental Health Division, Florey Institute of Neuroscience and Mental Health, University of Melbourne , Melbourne, VIC , Australia
| | - Terence Y Pang
- Behavioural Neurosciences Division, Florey Institute of Neuroscience and Mental Health, University of Melbourne , Melbourne, VIC , Australia
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Johar H, Emeny RT, Bidlingmaier M, Lacruz ME, Reincke M, Peters A, Heier M, Ladwig KH. Lower morning to evening cortisol ratio is associated with cognitive impairment in men but not women: An analysis of 733 older subjects of the cross-sectional KORA-Age study. Psychoneuroendocrinology 2015; 51:296-306. [PMID: 25462902 DOI: 10.1016/j.psyneuen.2014.10.011] [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: 06/23/2014] [Revised: 10/10/2014] [Accepted: 10/10/2014] [Indexed: 12/16/2022]
Abstract
BACKGROUND A dysregulated hypothalamic-pituitary-adrenocortical axis (HPA) is thought to play a role in the pathophysiology of cognitive impairment. Surprisingly, little agreement exists on the association of cortisol and cognitive impairment. Thus, we sought to examine the association between cognitive function and salivary cortisol levels in a representative sample of older men and women. METHODS A cross-sectional analysis was conducted among 733 study participants (65-90 years old, mean age=74.9) of the population-based KORA (Cooperative Health Research in the Region of Augsburg)-Age study. Associations were examined between cognitive function (determined by telephone interview for cognitive status-modified, TICS-m) and salivary cortisol measured upon waking (M1), 30min after awakening (M2), and in the late evening (E). RESULTS In a dose response manner, lower morning (M1 and M2), and increased evening levels were observed in participants with probable dementia (4.5%, N=33) and slightly increased in those with mild cognitive impairment (MCI) (13.8%, N=101) compared to healthy individuals. Higher morning to evening ratios were associated with reduced odds of cognitive impairment, even after adjustments for important confounders (M1/E ratio: OR=1.50, 95% CI=1.08-2.07, M2/E ratio: 1.41, 1.01-1.95, per 1 standard deviation (SD) increase). However, the significant association of an increased risk for cognitive impairment was observed among men (M1/E: OR=1.94, 95% CI=1.24-3.02; M2/E=1.74, 1.12-2.71) but not women (M1/E: OR=1.11, 0.69-1.78; M2/E=1.09, 0.67-1.77). CONCLUSION Our findings suggest that dysregulated HPA axis reactivity, evidenced by blunted diurnal cortisol responses, are associated with impaired cognitive function in an aged population.
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Affiliation(s)
- Hamimatunnisa Johar
- Institute of Epidemiology II, Helmholtz Zentrum München, German Research Centre for Environmental Health, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - Rebecca T Emeny
- Institute of Epidemiology II, Helmholtz Zentrum München, German Research Centre for Environmental Health, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - Martin Bidlingmaier
- Medizinische Klinik und Poliklinik IV, Klinikum der Ludwig-Maximilians-Universität München, Munich, Germany
| | - Maria Elena Lacruz
- Institute of Clinical Epidemiology, Martin-Luther University Halle, Halle, Germany
| | - Martin Reincke
- Medizinische Klinik und Poliklinik IV, Klinikum der Ludwig-Maximilians-Universität München, Munich, Germany
| | - Annette Peters
- Institute of Epidemiology II, Helmholtz Zentrum München, German Research Centre for Environmental Health, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - Margit Heier
- Institute of Epidemiology II, Helmholtz Zentrum München, German Research Centre for Environmental Health, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - Karl-Heinz Ladwig
- Institute of Epidemiology II, Helmholtz Zentrum München, German Research Centre for Environmental Health, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany; Department of Psychosomatic Medicine and Psychotherapy, Klinikum rechts der Isar, Technische Universität München, Langerstr. 3, Munich, Germany.
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Khalsa DS. Stress, Meditation, and Alzheimer's Disease Prevention: Where The Evidence Stands. J Alzheimers Dis 2015; 48:1-12. [PMID: 26445019 PMCID: PMC4923750 DOI: 10.3233/jad-142766] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/26/2015] [Indexed: 12/19/2022]
Abstract
Although meditation is believed to be over five thousand years old, scientific research on it is in its infancy. Mitigating the extensive negative biochemical effects of stress is a superficially discussed target of Alzheimer's disease (AD) prevention, yet may be critically important. This paper reviews lifestyle and stress as possible factors contributing to AD and meditation's effects on cognition and well-being for reduction of neurodegeneration and prevention of AD. This review highlights Kirtan Kriya (KK), an easy, cost effective meditation technique requiring only 12 minutes a day, which has been successfully employed to improve memory in studies of people with subjective cognitive decline, mild cognitive impairment, and highly stressed caregivers, all of whom are at increased risk for subsequent development of AD. KK has also been shown to improve sleep, decrease depression, reduce anxiety, down regulate inflammatory genes, upregulate immune system genes, improve insulin and glucose regulatory genes, and increase telomerase by 43%; the largest ever recorded. KK also improves psycho-spiritual well-being or spiritual fitness, important for maintenance of cognitive function and prevention of AD. KK is easy to learn and practice by aging individuals. It is the premise of this review that meditation in general, and KK specifically, along with other modalities such as dietary modification, physical exercise, mental stimulation, and socialization, may be beneficial as part of an AD prevention program.
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Affiliation(s)
- Dharma Singh Khalsa
- Alzheimer’s Research and Prevention Foundation, Tucson, AZ, USA
- Department of Internal/Integrative Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA
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Bradford D, Tschanz JT, Smith KR, Østbye T, Corcoran C, Welsh-Bohmer KA, Norton MC. Impact of offspring death on cognitive health in late life: the Cache County study. Am J Geriatr Psychiatry 2014; 22:1307-15. [PMID: 23954042 PMCID: PMC3923854 DOI: 10.1016/j.jagp.2013.05.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 04/21/2013] [Accepted: 05/09/2013] [Indexed: 10/26/2022]
Abstract
OBJECTIVE Experiencing the death of a child is associated with negative short-term mental health consequences, but less is known about cognitive outcomes and whether such associations extend to late life. We tested the hypothesis that experiencing an offspring death (OD) is associated with an increased rate of cognitive decline in late life. METHODS This population-based longitudinal study observed four cognitive statuses spaced 3-4 years apart, linked to an extensive database containing objective genealogic and vital statistics data. Home visits were conducted with 3,174 residents of a rural county in northern Utah, initially without dementia, aged 65-105. Cognitive status was measured with the Modified Mini-Mental State Exam at baseline and at 3-, 7-, and 10-year follow-ups. OD was obtained from the Utah Population Database, which contains statewide birth and death records. RESULTS In linear mixed models, controlling for age, gender, education, and apolipoprotein E status, subjects who experienced OD while younger than age 31 years experienced a significantly faster rate of cognitive decline in late life, but only if they had an ε4 allele. Reclassifying all OD (regardless of age) according to subsequent birth of another child, OD was only related to faster cognitive decline when there were no subsequent births. CONCLUSION Experiencing OD in early adulthood has a long-term association with cognitive functioning in late life, with a gene-environment interaction at the apolipoprotein E locus. Subsequent birth of another child attenuates this association.
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Affiliation(s)
- Daylee Bradford
- Department of Family Consumer and Human Development, Utah State University
| | - JoAnn T. Tschanz
- Department of Psychology, Center for Epidemiologic Studies, Utah State University
| | - Ken R. Smith
- Department of Family and Consumer Studies; Population Sciences, Huntsman Cancer Institute, University of Utah
| | - Truls Østbye
- Duke Global Health Institute, Duke University, and Duke – NUS Graduate Medical School, Singapore
| | - Chris Corcoran
- Department of Mathematics and Statistics, Center for Epidemiologic Studies, Utah State University
| | | | - Maria C. Norton
- Department of Family Consumer and Human Development, Utah State University,Department of Psychology, Center for Epidemiologic Studies, Utah State University
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Sheffler J, Moxley J, Sachs-Ericsson N. Stress, race, and APOE: understanding the interplay of risk factors for changes in cognitive functioning. Aging Ment Health 2014; 18:784-91. [PMID: 24521139 DOI: 10.1080/13607863.2014.880403] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
OBJECTIVES Biological and environmental factors are thought to contribute to the development of cognitive decline (CD). The Apolipoprotein E (APOE) ϵ4 allele is the greatest known genetic risk factor. The current study focused on the extent to which environmental factors, specifically stress, influence the relationship between the APOE allele and cognitive functioning and whether this relationship is stronger for African-Americans compared to Caucasians. METHODS Participants consisted of community-dwelling older adults from the Duke Established Populations for Epidemiologic Studies of the Elderly (N = 4,162). Data were drawn from two waves, which were three years apart. Cognitive functioning was assessed at both waves using the Short Portable Mental Status (SPMSQ). RESULTS Whereas there was no main effect of stress, there was a significant interaction between APOE status and stressful life events, such that increased stress in individuals with an ϵ4 allele lead to more errors on the SPMSQ than individuals with no allele. Inconsistent with predictions, there was a significant interaction between stress and race such that increased stressful events predicted CD in Caucasians but not African-Americans. CONCLUSIONS Recent stressful late-life events have a greater impact on the cognitive status of individuals with an ϵ4 allele. While Caucasians appear to be less vulnerable to cognitive losses at lower levels of stress, as the number of stressful life events increases that advantage disappears for Caucasians.
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Affiliation(s)
- Julia Sheffler
- a Department of Psychology , Florida State University , Tallahassee , USA
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Alkadhi KA, Tran TT. Chronic Stress Decreases Basal Levels of Memory-Related Signaling Molecules in Area CA1 of At-Risk (Subclinical) Model of Alzheimer’s Disease. Mol Neurobiol 2014; 52:93-100. [DOI: 10.1007/s12035-014-8839-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 07/30/2014] [Indexed: 11/28/2022]
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Korten NCM, Penninx BWJH, Pot AM, Deeg DJH, Comijs HC. Adverse Childhood and Recent Negative Life Events: Contrasting Associations With Cognitive Decline in Older Persons. J Geriatr Psychiatry Neurol 2014; 27:128-38. [PMID: 24578461 DOI: 10.1177/0891988714522696] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Accepted: 11/13/2013] [Indexed: 11/15/2022]
Abstract
OBJECTIVE To examine whether persons who experienced adverse childhood events or recent negative life events have a worse cognitive performance and faster cognitive decline and the role of depression and apolipoprotein E-∊4 in this relationship. METHODS The community-based sample consisted of 10-year follow-up data of 1312 persons participating in the Longitudinal Aging Study Amsterdam (age range 65-85 years). RESULTS Persons who experienced adverse childhood events showed a faster 10-year decline in processing speed but only when depressive symptoms were experienced. Persons with more recent negative life events showed slower processing speed at baseline but no faster decline. CONCLUSIONS Childhood adversity may cause biological or psychological vulnerability, which is associated with both depressive symptoms and cognitive decline in later life. The accumulation of recent negative life events did not affect cognitive functioning over a longer time period.
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Affiliation(s)
- Nicole C M Korten
- Department of Epidemiology and Biostatistics and the EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands.
| | - Brenda W J H Penninx
- Department of Psychiatry and the EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands
| | - Anne Margriet Pot
- Netherlands Institute of Mental Health and Addiction, Utrecht, the Netherlands Department of Clinical Psychology, VU University, Amsterdam, the Netherlands
| | - Dorly J H Deeg
- Department of Epidemiology and Biostatistics and the EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands
| | - Hannie C Comijs
- Department of Psychiatry and the EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands
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Chaudhry M, Hasnain S, Snitz BE, Wang X, Rosenthal S, Demirci FY, Kamboh MI. Association of APOE polymorphisms and stressful life events with dementia in a Pakistani population. Neurosci Lett 2014; 570:42-6. [PMID: 24746929 DOI: 10.1016/j.neulet.2014.04.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 03/03/2014] [Accepted: 04/07/2014] [Indexed: 01/01/2023]
Abstract
Dementia is a major public health problem worldwide. Alzheimer's disease (AD) is a major form of dementia and the APOE 4 allele is an established genetic risk factor for AD. Similarly, stressful life events are also associated with dementia. The objective of this study was to examine the association of APOE 4 and stressful life events with dementia in a Pakistani sample, which to our knowledge has not been reported previously. We also tested for an interaction between stressful life events and APOE 4 on dementia risk. A total of 176 subjects (61 cases and 115 controls) were recruited. All cases and healthy controls were interviewed to assess cognition, co-morbidities, history of stressful life events and demographics. Blood genotyping for the APOE polymorphism (E2/E3/E4) was performed. APOE 4 and stressful life events were each independently and significantly associated with the risk of dementia (APOE 4: P=0.00697; stressful life events: P=5.29E-09). However, we did not find a significant interaction between APOE 4 carrier status and stressful life events on risk of dementia (P=0.677). Although the sample size of this study was small, the established association of APOE 4 with dementia was confirmed the first time in a Pakistani sample. Furthermore, stressful life events were also found to be significantly associated with dementia in this population.
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Affiliation(s)
- M Chaudhry
- Department of Microbiology and Molecular Genetics, University of the Punjab, Lahore, Pakistan.
| | - S Hasnain
- Department of Microbiology and Molecular Genetics, University of the Punjab, Lahore, Pakistan; The Women University Multan, Multan, Pakistan
| | - B E Snitz
- Department of Neurology, University of Pittsburgh, Pittsburgh, PA, USA
| | - X Wang
- Department of Human Genetics, University of Pittsburgh, Pittsburgh, PA, USA
| | - S Rosenthal
- Department of Human Genetics, University of Pittsburgh, Pittsburgh, PA, USA
| | - F Y Demirci
- Department of Human Genetics, University of Pittsburgh, Pittsburgh, PA, USA
| | - M I Kamboh
- Department of Human Genetics, University of Pittsburgh, Pittsburgh, PA, USA
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Vidarsdottir H, Fang F, Chang M, Aspelund T, Fall K, Jonsdottir MK, Jonsson PV, Cotch MF, Harris TB, Launer LJ, Gudnason V, Valdimarsdottir U. Spousal loss and cognitive function in later life: a 25-year follow-up in the AGES-Reykjavik study. Am J Epidemiol 2014; 179:674-83. [PMID: 24444551 DOI: 10.1093/aje/kwt321] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The aim of this study was to investigate the associations between loss of a life partner and the development of dementia and decline in cognitive function in later life. We used an Icelandic cohort of 4,370 participants in the Age, Gene/Environment Susceptibility-Reykjavik Study who were living as married in 1978 (born in 1907-1935) and were either still married (unexposed cohort) or widowed (exposed cohort) at follow-up (in 2002-2006). We ascertained history of marital status and spouse's death by record linkage to the Registry of the Total Population, Statistics Iceland. The outcome measures were as follows: 1) dementia and mild cognitive impairment; and 2) memory, speed of processing, and executive function. During the observation period, 3,007 individuals remained married and 1,363 lost a spouse through death. We did not find any significant associations between loss of a spouse and our outcome variables, except that widowed women had poorer executive function (mean = -0.08) during the first 2 years after their husbands' deaths compared with still-married women (mean = 0.09). Our findings do not support the notion that the risk of dementia is increased following the loss of a spouse, yet women demonstrate a seemingly temporary decline in executive function following the death of a partner.
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Panizzon MS, Hauger R, Xian H, Vuoksimaa E, Spoon KM, Mendoza SP, Jacobson KC, Vasilopoulos T, Rana BK, McKenzie R, McCaffery JM, Lyons MJ, Kremen WS, Franz CE. Interaction of APOE genotype and testosterone on episodic memory in middle-aged men. Neurobiol Aging 2013; 35:1778.e1-8. [PMID: 24444806 DOI: 10.1016/j.neurobiolaging.2013.12.025] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Revised: 12/19/2013] [Accepted: 12/21/2013] [Indexed: 01/12/2023]
Abstract
Age-related changes in testosterone are believed to be a key component of the processes that contribute to cognitive aging in men. The APOE-ε4 allele may interact with testosterone and moderate the hormone's association with cognition. The goals of the present study were to examine the degree to which free testosterone is associated with episodic memory in a community-based sample of middle-aged men, and examine the potential interaction between free testosterone and the APOE-ε4 allele. Data were used from 717 participants in the Vietnam Era Twin Study of Aging. Average age was 55.4 years (standard deviation = 2.5). Significant positive associations were observed between free testosterone level and verbal episodic memory, as well as a significant interaction between free testosterone and APOE-ε4 status. In ε4 carriers free testosterone was positively associated with verbal episodic memory performance (story recall), whereas no association was observed in ε4 noncarriers. Results support the hypothesis that APOE-ε4 status increases susceptibility to other risk factors, such as low testosterone, which may ultimately contribute to cognitive decline or dementia.
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Affiliation(s)
- Matthew S Panizzon
- Department of Psychiatry, University of California, San Diego, CA, USA; Twin Research Laboratory, Center for Behavioral Genomics, University of California, San Diego, CA, USA.
| | - Richard Hauger
- Department of Psychiatry, University of California, San Diego, CA, USA; VA San Diego Healthcare System, CA, USA; Center of Excellence for Stress and Mental Health, VA San Diego Healthcare System, San Diego, CA, USA
| | - Hong Xian
- Department of Biostatistics, St. Louis University, College for Public Health & Social Justice, St. Louis, MO, USA; Research Service, St. Louis Veterans Affairs Medical Center, St. Louis, MO
| | - Eero Vuoksimaa
- Department of Psychiatry, University of California, San Diego, CA, USA; Twin Research Laboratory, Center for Behavioral Genomics, University of California, San Diego, CA, USA; Department of Public Health, University of Helsinki, Helsinki, Finland
| | - Kelly M Spoon
- Computational Science Research Center, San Diego State University, San Diego, CA, USA
| | - Sally P Mendoza
- Department of Psychology, University of California, Davis, CA, USA
| | | | | | - Brinda K Rana
- Department of Psychiatry, University of California, San Diego, CA, USA; Twin Research Laboratory, Center for Behavioral Genomics, University of California, San Diego, CA, USA
| | - Ruth McKenzie
- Department of Psychology, Boston University, Boston, MA, USA
| | - Jeanne M McCaffery
- Department of Psychiatry and Human Behavior, The Miriam Hospital and Warren Alpert School of Medicine at Brown University, Providence, RI, USA
| | - Michael J Lyons
- Department of Psychology, Boston University, Boston, MA, USA
| | - William S Kremen
- Department of Psychiatry, University of California, San Diego, CA, USA; Twin Research Laboratory, Center for Behavioral Genomics, University of California, San Diego, CA, USA; VA San Diego Healthcare System, CA, USA; Center of Excellence for Stress and Mental Health, VA San Diego Healthcare System, San Diego, CA, USA
| | - Carol E Franz
- Department of Psychiatry, University of California, San Diego, CA, USA; Twin Research Laboratory, Center for Behavioral Genomics, University of California, San Diego, CA, USA
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Kim TY, Chung HG, Shin HS, Kim SJ, Choi JH, Chung MY, An SK, Choi TK, So HS, Cho HS. Apolipoprotein E gene polymorphism, alcohol use, and their interactions in combat-related posttraumatic stress disorder. Depress Anxiety 2013; 30:1194-201. [PMID: 23761065 DOI: 10.1002/da.22138] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Revised: 04/13/2013] [Accepted: 05/08/2013] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND The symptomatology of posttraumatic stress disorder (PTSD) is related not only to the intensity of the causative trauma, but also to alcohol use and genetic factors. Among the many candidate genes, the apolipoprotein E gene (APOE) is thought to be associated with stress reactivity. METHODS Korean veterans of the Vietnam War with (n = 128) or without (n = 128) PTSD participated in this study. The Clinician-Administered PTSD Scale and Combat Exposure Scale were administered, and the severity of alcohol use was assessed among these veterans. The APOE polymorphism and clinical variables of the subjects were compared, and associations between PTSD and potential explanatory variables were tested using logistic regression analysis. RESULTS Higher frequencies of APOE ε2 alleles and a greater number of individuals with the ε2 allele were found in the PTSD group. Among patients with PTSD, ε2-allele noncarriers consumed alcohol in greater amounts and more frequently than did ε2-allele carriers. Regression analysis revealed a significant interactional effect between harmful drinking and the absence of the ε2 allele associated with PTSD risk. CONCLUSIONS These results suggest that the APOE ε2 allele operates as a susceptibility gene for combat-related PTSD, with the relationship between alcohol use and PTSD differing according to the ε2-allele status. Future studies should determine the role of the APOE in adaptation to extreme stress, the development of PTSD, and comorbid alcohol-related disorders.
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Affiliation(s)
- Tae Yong Kim
- Department of Neuropsychiatry, Veterans Health Service Medical Center, Seoul, Republic of Korea; Department of Psychiatry, Yonsei University College of Medicine, Seoul, Republic of Korea
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Ekuni D, Endo Y, Tomofuji T, Azuma T, Irie K, Kasuyama K, Morita M. Effects of apoE deficiency and occlusal disharmony on amyloid-beta production and spatial memory in rats. PLoS One 2013; 8:e74966. [PMID: 24066161 PMCID: PMC3774813 DOI: 10.1371/journal.pone.0074966] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Accepted: 08/09/2013] [Indexed: 12/21/2022] Open
Abstract
Amyloid-β (Aβ) plays a causative role in Alzheimer’s disease. Apolipoprotein E (apoE) is involved in Aβ accumulation, whereas occlusal disharmony increases Aβ production in the rat hippocampus. The purpose of the present study was to investigate the effects of apoE deficiency and occlusal disharmony on Aβ production and spatial memory. Wild-type (WT) (n = 12) and apoE-deficient [ApoE(−/−)] (n = 12) rats (Sprague-Dawley; 8 weeks old) were used. These rats were randomly divided into four groups of six rats each: two control (C) groups: WT (C-WT) and ApoE [C-ApoE(−/−)], and two occlusal disharmony (D) groups: WT (D-WT) and ApoE [D-ApoE(−/−)]. The C group received no treatment for 8 weeks. In the D group, the maxillary molar cusps were cut off for 8 weeks. The spatial memory of rats was assessed according to their behavioral performance in a radial arm maze. In both genotypes of rats, significant differences in the reference memory, Aβ42 production, β-secretase expression and plasma corticosterone levels were observed between the C and D groups (P < 0.0125). The levels of Aβ42 and glucocorticoid receptor in the C-ApoE(−/−) group were also significantly higher than those in the C-WT group (P < 0.0125). However, no significant differences in these parameters were found between the two genotypes with occlusal disharmony. In conclusion, occlusal disharmony induces cognitive dysfunction and Aβ accumulation in the rat hippocampus, and the effects of occlusal disharmony on Aβ accumulation and cognitive dysfunction were larger than those of apoE deficiency.
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Affiliation(s)
- Daisuke Ekuni
- Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
- * E-mail:
| | - Yasumasa Endo
- Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Takaaki Tomofuji
- Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Tetsuji Azuma
- Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Koichiro Irie
- Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Kenta Kasuyama
- Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Manabu Morita
- Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
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Rönnlund M, Sundström A, Sörman DE, Nilsson LG. Effects of perceived long-term stress on subjective and objective aspects of memory and cognitive functioning in a middle-aged population-based sample. The Journal of Genetic Psychology 2013; 174:25-41. [PMID: 23534095 DOI: 10.1080/00221325.2011.635725] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The longitudinal effects of perceived stress on measures of memory and two other cognitive functions (word fluency, visuospatial ability) in a middle-aged sample (40-60 years, M age = 47.1 years, SD = 6.1 years; n = 192) were examined. A group describing themselves as stressed in general at baseline, and at follow-up measurement 5 and 10 years later (n = 96) was compared with a matched (age, sex) low-stress group (n = 96). The results revealed more depressive symptoms over time in the high-stress group. With regard to memory, a dissociation between subjective and objective measures was observed. Specifically, participants in the high-stress group rated their memory as worse over time as compared with controls, and reported a higher frequency of occurrence of everyday memory failures, effects partly independent of depressive symptoms. However, the groups did not differ in terms of objective episodic memory performance, word fluency or block design performance, with stable levels of performance over time regardless of perceived stress. The lack of effects of stress on cognitive performance is discussed in the light of factors such as stress level, age of the participants, and other individual difference factors.
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Affiliation(s)
- Michael Rönnlund
- Umeå University, Department of Psychology, S-90187 Umeå, Sweden.
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47
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Relationship between cortisol level and prevalent/incident cognitive impairment and its moderating factors in older adults. Int Psychogeriatr 2013; 25:252-62. [PMID: 23088830 DOI: 10.1017/s1041610212001706] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND The objectives of this study were to examine the factors modifying the relationship between cortisol level and prevalent/incident cognitive impairment in older adults and to verify whether these relationships were non-linear. METHODS Data were collected from 1,226 individuals aged 65 and older by two in-home interviews separated by 12 months. Cortisol level was measured using saliva samples taken at the beginning of the baseline interview before cognitive, mental, and physical health evaluations. Prevalent and incident cognitive impairment were defined using the Mini-Mental State Examination scores according to normative data for age, education level, and sex. RESULTS High morning cortisol level increased the risk of incident cognitive impairment in participants with anxiety or depressive episode while low cortisol level increased the risk in participants without anxiety or depressive episode. In high educated participants, but not in low educated participants, high morning cortisol level was associated with prevalent cognitive impairment and high afternoon cortisol level increased the risk of incident cognitive impairment. The results also suggested that lower morning cortisol values could increase the risk of incident cognitive impairment in individuals with few chronic diseases. A curvilinear relationship was observed between morning cortisol and the probability of incident cognitive impairment, but further analyses suggested that it was likely explained by anxiety and depressive episode. CONCLUSIONS These results suggest that cognitive impairment in older adults is linked to higher or lower cortisol level depending on characteristics such as anxiety, depressive episode, education level, and physical health.
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Lenze EJ, Dixon D, Mantella RC, Dore PM, Andreescu C, Reynolds CF, Newcomer JW, Butters MA. Treatment-related alteration of cortisol predicts change in neuropsychological function during acute treatment of late-life anxiety disorder. Int J Geriatr Psychiatry 2012; 27:454-62. [PMID: 21681817 PMCID: PMC4601802 DOI: 10.1002/gps.2732] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Accepted: 03/14/2011] [Indexed: 01/04/2023]
Abstract
OBJECTIVE Older adults with anxiety disorders are burdened by impairment in neurocognition, which may be mediated by elevated circulating cortisol levels. In a randomized controlled trial of acute serotonin-reuptake inhibitor treatment for late-life anxiety disorder, we examined whether change in salivary cortisol concentrations during treatment predicted improvements in measures of memory and executive function. METHODS We examined 60 adults aged 60 years and older, who took part in a 12-week trial of escitalopram versus placebo for generalized anxiety disorder. All subjects had pre-treatment and post-treatment assessments that included monitoring of peak and total daily cortisol and a comprehensive neuropsychological evaluation. RESULTS Salivary cortisol changes during treatment showed significant associations with changes in immediate and delayed memory but no association with executive tasks (measures of working memory and set shifting). Analyses suggested that a decrease in cortisol due to serotonin-reuptake inhibitor treatment was responsible for the memory changes: memory improvement was seen with cortisol reduction among patients receiving escitalopram but not among patients receiving placebo. CONCLUSION Serotonin-reuptake inhibitor-induced alteration in circulating cortisol during treatment of generalized anxiety disorder predicted changes in immediate and delayed memory. This finding suggests a novel treatment strategy in late-life anxiety disorders: targeting hypothalamic-pituitary- adrenal axis dysfunction to improve memory.
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Affiliation(s)
- Eric J Lenze
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO, USA.
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Rodrigues R, Smith MA, Wang X, Perry G, Lee HG, Zhu X, Petersen RB. Molecular neuropathogenesis of Alzheimer's disease: an interaction model stressing the central role of oxidative stress. FUTURE NEUROLOGY 2012; 7:287-305. [PMID: 23086377 DOI: 10.2217/fnl.12.27] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Alzheimer's disease (AD) exhibits a complex etiology that simultaneously manifests as a complex cellular, neurobiological, molecular, anatomic-physiological and clinical entity. Other significant psychiatric conditions, such as depression and schizophrenia, may also present with complex and concurrent clinical and/or molecular phenotypes. These neuropsychiatric pathologies also originate from both environmental and genetic factors. We analyzed the molecular phenotypes of AD and discuss them with respect to the classical theories, which we integrated into mechanisms that share molecular and/or anatomical connections. Based on these mechanisms, we propose an interaction model and discuss the model in light of studies that refute or support it. Given the spectrum of AD phenotypes, we limit the scope of our discussion to a few, which facilitates concrete analysis. In addition, the study of specific, individual pathogenic phenotypes may be critical to defining the complex mechanisms leading to AD, thereby improving strategies for developing novel therapies.
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Affiliation(s)
- Roberto Rodrigues
- Ave. Icaraí Cristal 74 (Clinic), 90.810-000 Porto Alegre, Rio Grande do Sul (RS), Brazil
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Boardman JD, Barnes LL, Wilson RS, Evans DA, Mendes de Leon CF. Social disorder, APOE-E4 genotype, and change in cognitive function among older adults living in Chicago. Soc Sci Med 2012; 74:1584-90. [PMID: 22465377 DOI: 10.1016/j.socscimed.2012.02.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Revised: 12/21/2011] [Accepted: 02/07/2012] [Indexed: 01/20/2023]
Abstract
The goal of this paper is to describe the simultaneous influence of social and genetic risk factors on declines in cognitive functioning among older American adults. We use detailed information about the social characteristics of older adults' neighborhoods from the Chicago Health and Aging Project (n = 1655; ages 65+) in conjunction with information about respondent's APOE genotype to predict changes in cognitive function over time. Results indicate that the presence of the ε4 allele is associated with a significantly lower cognitive function score at baseline and greater declines in cognitive function compared to those without this risk allele. Importantly, we also show significant variation in the effect of the ε4 allele across neighborhoods and our results indicate that this genotype is more strongly associated with cognitive function for residents of neighborhoods with the lowest levels of social disorder. Our findings support the non-causal social push gene-environment interaction model.
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Affiliation(s)
- Jason D Boardman
- Institute of Behavioral Science, University of Colorado, 1440 15th St., Boulder, CO 80303, USA.
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