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Alzheimer's & Dementia: the Journal of the Alzheimer's Association

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https://www.readbyqxmd.com/read/28774656/plasma-apolipoprotein-e-levels-and-risk-of-dementia-a-mendelian-randomization-study-of-106-562-individuals
#1
Katrine L Rasmussen, Anne Tybjærg-Hansen, Børge G Nordestgaard, Ruth Frikke-Schmidt
INTRODUCTION: In recent prospective studies, low plasma levels of apolipoprotein E (apoE) are associated with high risk of dementia. Whether this reflects a causal association remains to be established. METHODS: Using a Mendelian randomization approach, we studied 106,562 and 75,260 individuals from the general population in observational and genetic analyses, respectively. RESULTS: In observational analyses risk of Alzheimer disease and all dementia increased stepwise as a function of stepwise lower apoE levels (P for trend, 2 × 10(-17) and 9 × 10(-21))...
July 27, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28755839/peripheral-complement-interactions-with-amyloid-%C3%AE-peptide-in-alzheimer-s-disease-2-relationship-to-a%C3%AE-immunotherapy
#2
Andrés Crane, William D Brubaker, Jenny U Johansson, Abhishek Trigunaite, Justine Ceballos, Bonnie Bradt, Courtney Glavis-Bloom, Tanya L Wallace, Andrea J Tenner, Joseph Rogers
INTRODUCTION: Our previous studies have shown that amyloid β peptide (Aβ) is subject to complement-mediated clearance from the peripheral circulation, and that this mechanism is deficient in Alzheimer's disease. The mechanism should be enhanced by Aβ antibodies that form immune complexes (ICs) with Aβ, and therefore may be relevant to current Aβ immunotherapy approaches. METHODS: Multidisciplinary methods were employed to demonstrate enhanced complement-mediated capture of Aβ antibody immune complexes compared with Aβ alone in both erythrocytes and THP1-derived macrophages...
July 26, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28738188/sleep-characteristics-and-risk-of-dementia-and-alzheimer-s-disease-the-atherosclerosis-risk-in-communities-study
#3
Pamela L Lutsey, Jeffrey R Misialek, Thomas H Mosley, Rebecca F Gottesman, Naresh M Punjabi, Eyal Shahar, Richard MacLehose, Rachel P Ogilvie, David Knopman, Alvaro Alonso
INTRODUCTION: This study tested the hypotheses that late-midlife obstructive sleep apnea (OSA) and short and long sleep duration are associated with dementia for more than 15 years of follow-up. METHODS: A total of 1667 Atherosclerosis Risk in Communities Study participants underwent in-home polysomnography (1996-1998) and were followed for dementia. Dementia was defined by (1) hospitalization diagnosis codes (1996-2012) and (2) a comprehensive neurocognitive examination (2011-2013) with adjudication...
July 21, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28738187/presymptomatic-atrophy-in-autosomal-dominant-alzheimer-s-disease-a%C3%A2-serial-mri-study
#4
Kirsi M Kinnunen, David M Cash, Teresa Poole, Chris Frost, Tammie L S Benzinger, R Laila Ahsan, Kelvin K Leung, M Jorge Cardoso, Marc Modat, Ian B Malone, John C Morris, Randall J Bateman, Daniel S Marcus, Alison Goate, Stephen Salloway, Stephen Correia, Reisa A Sperling, Jasmeer P Chhatwal, Richard Mayeux, Adam M Brickman, Ralph N Martins, Martin R Farlow, Bernardino Ghetti, Andrew J Saykin, Clifford R Jack, Peter R Schofield, Eric McDade, Michael W Weiner, John M Ringman, Paul M Thompson, Colin L Masters, Christopher C Rowe, Martin N Rossor, Sebastien Ourselin, Nick C Fox
INTRODUCTION: Identifying at what point atrophy rates first change in Alzheimer's disease is important for informing design of presymptomatic trials. METHODS: Serial T1-weighed magnetic resonance imaging scans of 94 participants (28 noncarriers, 66 carriers) from the Dominantly Inherited Alzheimer Network were used to measure brain, ventricular, and hippocampal atrophy rates. For each structure, nonlinear mixed-effects models estimated the change-points when atrophy rates deviate from normal and the rates of change before and after this point...
July 21, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28734783/dementia-prevalence-and-incidence-in-a-federation-of-european-electronic-health-record-databases-the-european-medical-informatics-framework-resource
#5
Gayan Perera, Lars Pedersen, David Ansel, Myriam Alexander, H Michael Arrighi, Paul Avillach, Nadia Foskett, Rosa Gini, Mark F Gordon, Usha Gungabissoon, Miguel-Angel Mayer, Gerald Novak, Peter Rijnbeek, Gianluca Trifirò, Johan van der Lei, Pieter J Visser, Robert Stewart
INTRODUCTION: The European Medical Information Framework consortium has assembled electronic health record (EHR) databases for dementia research. We calculated dementia prevalence and incidence in 25 million persons from 2004 to 2012. METHODS: Six EHR databases (three primary care and three secondary care) from five countries were interrogated. Dementia was ascertained by consensus harmonization of clinical/diagnostic codes. Annual period prevalences and incidences by age and gender were calculated and meta-analyzed...
July 21, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28732191/a-cardinal-sin-when-researching-neuropsin-klk8-thou-shalt-validate-antibodies
#6
LETTER
Debomoy K Lahiri, Arpita Konar, Mahendra K Thakur, Bryan Maloney
No abstract text is available yet for this article.
July 18, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28719802/cerebral-hypoperfusion-is-not-associated-with-an-increase-in-amyloid-%C3%AE-pathology-in-middle-aged-or-elderly-people
#7
Oskar Hansson, Sebastian Palmqvist, Hanna Ljung, Tobias Cronberg, Danielle van Westen, Ruben Smith
INTRODUCTION: It is hypothesized that cerebral hypoperfusion promotes the development of Alzheimer pathology. We therefore studied whether longstanding cerebral hypoperfusion is associated with Alzheimer pathology in nondemented humans. METHODS: Cerebral blood flow and amyloid β ((18)F-Flutemetamol) positron emission tomography retention were assessed in eleven patients with unilateral occlusion of precerebral arteries resulting in chronic and uneven hypoperfusion...
July 15, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28711346/association-of-cancer-and-alzheimer-s-disease-risk-in-a-national-cohort-of-veterans
#8
Laura Frain, David Swanson, Kelly Cho, David Gagnon, Kun Ping Lu, Rebecca A Betensky, Jane Driver
INTRODUCTION: To examine the risk of Alzheimer's disease (AD) among cancer survivors in a national database. METHODS: Retrospective cohort of 3,499,378 mostly male US veterans aged ≥65 years were followed between 1996 and 2011. We used Cox models to estimate risk of AD and alternative outcomes (non-AD dementia, osteoarthritis, stroke, and macular degeneration) in veterans with and without a history of cancer. RESULTS: Survivors of a wide variety of cancers had modestly lower AD risk, but increased risk of the alternative outcomes...
July 12, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28710906/upward-drift-in-cerebrospinal-fluid-amyloid-%C3%AE-42-assay-values-for-more-than-10%C3%A2-years
#9
Suzanne E Schindler, Courtney L Sutphen, Charlotte Teunissen, Lena M McCue, John C Morris, David M Holtzman, Sandra D Mulder, Philip Scheltens, Chengjie Xiong, Anne M Fagan
INTRODUCTION: The best-established cerebrospinal fluid (CSF) biomarkers for Alzheimer's disease are levels of amyloid β 42 (Aβ42), total tau (tau), and phosphorylated tau 181 (ptau). We examined whether a widely used commercial immunoassay for CSF Aβ42, tau, and ptau provided stable measurements for more than ∼10 years. METHODS: INNOTEST assay values for CSF Aβ42, tau, and ptau from Washington University in St. Louis and VU Medical Center, Amsterdam, were evaluated...
July 12, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28734653/amyloid-%C3%AE-concentrations-and-stable-isotope-labeling-kinetics-of-human-plasma-specific-to-central-nervous-system-amyloidosis
#10
Vitaliy Ovod, Kara N Ramsey, Kwasi G Mawuenyega, Jim G Bollinger, Terry Hicks, Theresa Schneider, Melissa Sullivan, Katrina Paumier, David M Holtzman, John C Morris, Tammie Benzinger, Anne M Fagan, Bruce W Patterson, Randall J Bateman
INTRODUCTION: Cerebrospinal fluid analysis and other measurements of amyloidosis, such as amyloid-binding positron emission tomography studies, are limited by cost and availability. There is a need for a more practical amyloid β (Aβ) biomarker for central nervous system amyloid deposition. METHODS: We adapted our previously reported stable isotope labeling kinetics protocol to analyze the turnover kinetics and concentrations of Aβ38, Aβ40, and Aβ42 in human plasma...
July 11, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28709585/patients-come-from-populations-and-populations-contain-patients-a-two-stage-scientific-and-ethics-review-the-next-adaptation-for-single-institutional-review-boards
#11
David Knopman, Eli Alford, Kaitlin Tate, Mark Long, Ara S Khachaturian
INTRODUCTION: For nearly 50 years, institutional review boards (IRB) and independent ethics committees have featured local oversight as a core function of research ethics reviews. However growing complexity in Alzheimer's clinical research suggests current approaches to research volunteer safety is hampering development of new therapeutics. As a partial response to this challenge, the NIH has mandated that all NIH-funded multi-site studies will use a single Institutional Review Board...
July 11, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28704640/the-pitfalls-of-biomarker-based-classification-schemes
#12
LETTER
Ignacio Illán-Gala, Eduard Vilaplana, Jordi Pegueroles, Victor Montal, Daniel Alcolea, Rafael Blesa, Alberto Lleó, Juan Fortea
No abstract text is available yet for this article.
July 10, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28692821/dental-care-utilization-in-patients-with-different-types-of-dementia-a%C3%A2-longitudinal-nationwide-study-of-58-037-individuals
#13
Seyed-Mohammad Fereshtehnejad, Sara Garcia-Ptacek, Dorota Religa, Jacob Holmer, Kåre Buhlin, Maria Eriksdotter, Gunilla Sandborgh-Englund
INTRODUCTION: Dementia may be associated with discontinuation of regular dental checkups, which in turn results in poorer oral health. METHODS: We investigated the trend of change in dental care utilization and the number of teeth before and after being diagnosed with dementia. Longitudinal cognitive- and dental health-related information were merged using data on 58,037 newly diagnosed individuals from the Swedish Dementia Registry and Swedish Dental Health Register during 2007 to 2015...
July 8, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28692820/response-letter
#14
LETTER
Kathy Keyvani
No abstract text is available yet for this article.
July 8, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28692819/physical-activity-modifies-the-influence-of-apolipoprotein-e-%C3%AE%C2%B54-allele-and-type-2-diabetes-on-dementia-and-cognitive-impairment-among-older-mexican-americans
#15
I-Fan Shih, Kimberly Paul, Mary Haan, Yu Yu, Beate Ritz
INTRODUCTION: The etiologies of dementia are complex and influenced by genetic and environmental factors including medical conditions. METHODS: We used Cox regression model to estimate the individual and joint effects of physical activity (PA), apolipoprotein E (APOE) ε4, and diabetes status on risk of dementia and cognitive impairment without dementia (CIND) among 1438 cognitively intact Mexican American elderly who were followed up to 10 years. RESULTS: The risk of developing dementia/CIND was increased more than threefold in APOE ε4 carriers or diabetics with low levels of PA compared with ε4 noncarriers or nondiabetics who engaged in high PA (ε4: hazard ratio [HR] = 3...
July 8, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28624335/neuropathologic-features-of-tomm40-523-variant-on-late-life-cognitive-decline
#16
Lei Yu, Michael W Lutz, Jose M Farfel, Robert S Wilson, Daniel K Burns, Ann M Saunders, Philip L De Jager, Lisa L Barnes, Julie A Schneider, David A Bennett
INTRODUCTION: The study investigated the role of neuropathologies in the relationship between TOMM40 '523 genotype and late-life cognitive decline. METHODS: Participants were community-dwelling older persons who had annual cognitive assessments and brain autopsies after death. Genotyping used DNA from peripheral blood or postmortem brain tissue. Linear mixed models assessed the extent to which the association of '523 genotype with cognitive decline is attributable to neuropathologies...
June 15, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28623677/incidence-of-cognitively-defined-late-onset-alzheimer-s-dementia-subgroups-from-a-prospective-cohort-study
#17
Paul K Crane, Emily Trittschuh, Shubhabrata Mukherjee, Andrew J Saykin, R Elizabeth Sanders, Eric B Larson, Susan M McCurry, Wayne McCormick, James D Bowen, Thomas Grabowski, Mackenzie Moore, Julianna Bauman, Alden L Gross, C Dirk Keene, Thomas D Bird, Laura E Gibbons, Jesse Mez
INTRODUCTION: There may be biologically relevant heterogeneity within typical late-onset Alzheimer's dementia. METHODS: We analyzed cognitive data from people with incident late-onset Alzheimer's dementia from a prospective cohort study. We determined individual averages across memory, visuospatial functioning, language, and executive functioning. We identified domains with substantial impairments relative to that average. We compared demographic, neuropathology, and genetic findings across groups defined by relative impairments...
June 15, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28624149/brain-function-and-structure-and-risk-for-incident-diabetes-the-atherosclerosis-risk-in-communities-study
#18
Michael P Bancks, Alvaro Alonso, Rebecca F Gottesman, Thomas H Mosley, Elizabeth Selvin, James S Pankow
INTRODUCTION: Diabetes is prospectively associated with cognitive decline. Whether lower cognitive function and worse brain structure are prospectively associated with incident diabetes is unclear. METHODS: We analyzed data for 10,133 individuals with cognitive function testing (1990-1992) and 1212 individuals with brain magnetic resonance imaging (1993-1994) from the Atherosclerosis Risk in Communities cohort. We estimated hazard ratios for incident diabetes through 2014 after adjustment for traditional diabetes risk factors and cohort attrition...
June 14, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28627380/post-traumatic-stress-disorder-and-risk-of-dementia-among-members-of-a-health-care-delivery-system
#19
Jason D Flatt, Paola Gilsanz, Charles P Quesenberry, Kathleen B Albers, Rachel A Whitmer
INTRODUCTION: Post-traumatic stress disorder (PTSD) is associated with an increased risk of dementia in male veterans, but little is known in females and civilians. METHODS: PTSD and comorbidities were abstracted from medical records from 1/1/1996 to 12/31/2001. Dementia incidence from 1/1/2002 to 12/31/2014 in 499,844 health care members aged 60+ years over an average of 8.2 years. Cox proportional hazard models were adjusted for age, demographics, and comorbidities...
June 13, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28627379/microvascular-changes-in-down-syndrome-with-alzheimer-type-pathology-insights-into-a-potential-vascular-mechanism-for-down-syndrome-and-alzheimer-s-disease
#20
David A Drachman, Thomas W Smith, Bassam Alkamachi, Kevin Kane
INTRODUCTION: The mechanism triggering degeneration in Alzheimer's disease (AD) remains uncertain. Therapeutic failure following amyloid β (Aβ) removal casts doubt on amyloid neurotoxicity per se as the primary cause of AD. Impaired microvascular function has been suggested as an alternative etiology. People with Down syndrome (DS) develop Alzheimer pathology, but whether microvascular impairment also occurs in DS (as in AD) is unknown. METHODS: We examined brain microvasculature in five DS subjects with AD-type histopathology, seven AD cases, and seven controls without AD-type pathology...
June 13, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
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