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Apo E4

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https://www.readbyqxmd.com/read/28430712/apolipoprotein-e-variants-and-genetic-susceptibility-to-combat-related-post-traumatic-stress-disorder-a-meta-analysis
#1
Yang Roby
BACKGROUND: Apolipoprotein E (APOE) has recently been studied as a risk factor for association with developing combat-related post-traumatic stress disorder (PTSD) in the military population. These studies have yielded inconsistent findings. The present study carried out a meta-analysis to establish whether the APOE polymorphism confers increased susceptibility to combat-related PTSD. METHODS: PubMed, Medline, Embase, PsycInfo, and Google Scholar were searched for potential publications relating to patients with PTSD in military settings with combat exposure...
April 18, 2017: Psychiatric Genetics
https://www.readbyqxmd.com/read/28427934/cognitive-subtypes-of-probable-alzheimer-s-disease-robustly-identified-in%C3%A2-four-cohorts
#2
Nienke M E Scheltens, Betty M Tijms, Teddy Koene, Frederik Barkhof, Charlotte E Teunissen, Steffen Wolfsgruber, Michael Wagner, Johannes Kornhuber, Oliver Peters, Brendan I Cohn-Sheehy, Gil D Rabinovici, Bruce L Miller, Joel H Kramer, Philip Scheltens, Wiesje M van der Flier
INTRODUCTION: Patients with Alzheimer's disease (AD) show heterogeneity in profile of cognitive impairment. We aimed to identify cognitive subtypes in four large AD cohorts using a data-driven clustering approach. METHODS: We included probable AD dementia patients from the Amsterdam Dementia Cohort (n = 496), Alzheimer's Disease Neuroimaging Initiative (n = 376), German Dementia Competence Network (n = 521), and University of California, San Francisco (n = 589)...
April 17, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28418400/short-telomere-length-is-associated-with-impaired-cognitive-performance-in-european-ancestry-cohorts
#3
S Hägg, Y Zhan, R Karlsson, L Gerritsen, A Ploner, S J van der Lee, L Broer, J Deelen, R E Marioni, A Wong, A Lundquist, G Zhu, N K Hansell, E Sillanpää, I O Fedko, N A Amin, M Beekman, A J M de Craen, S Degerman, S E Harris, K-J Kan, C M Martin-Ruiz, G W Montgomery, A N Adolfsson, C A Reynolds, N J Samani, H E D Suchiman, A Viljanen, T von Zglinicki, M J Wright, J-J Hottenga, D I Boomsma, T Rantanen, J A Kaprio, D R Nyholt, N G Martin, L Nyberg, R Adolfsson, D Kuh, J M Starr, I J Deary, P E Slagboom, C M van Duijn, V Codd, N L Pedersen
The association between telomere length (TL) dynamics on cognitive performance over the life-course is not well understood. This study meta-analyses observational and causal associations between TL and six cognitive traits, with stratifications on APOE genotype, in a Mendelian Randomization (MR) framework. Twelve European cohorts (N=17 052; mean age=59.2±8.8 years) provided results for associations between qPCR-measured TL (T/S-ratio scale) and general cognitive function, mini-mental state exam (MMSE), processing speed by digit symbol substitution test (DSST), visuospatial functioning, memory and executive functioning (STROOP)...
April 18, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28387812/gene-based-association-studies-report-genetic-links-for-clinical-subtypes-of-frontotemporal-dementia
#4
Aniket Mishra, Raffaele Ferrari, Peter Heutink, John Hardy, Yolande Pijnenburg, Danielle Posthuma
Genome-wide association studies in frontotemporal dementia showed limited success in identifying associated loci. This is possibly due to small sample size, allelic heterogeneity, small effect sizes of single genetic variants, and the necessity to statistically correct for testing millions of genetic variants. To overcome these issues, we performed gene-based association studies on 3348 clinically identified frontotemporal dementia cases and 9390 controls (discovery, replication and joint-cohort analyses). We report association of APOE and TOMM40 with behavioural variant frontotemporal dementia, and ARHGAP35 and SERPINA1 with progressive non-fluent aphasia...
April 5, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28387666/increased-carbohydrate-intake-is-associated-with-poorer-performance-in-verbal-memory-and-attention-in-an-apoe-genotype-dependent-manner
#5
Samantha L Gardener, Stephanie R Rainey-Smith, Hamid R Sohrabi, Michael Weinborn, Giuseppe Verdile, W M A D Binosha Fernando, Yen Ying Lim, Karra Harrington, Samantha Burnham, Kevin Taddei, Colin L Masters, Stuart L Macaulay, Christopher C Rowe, David Ames, Paul Maruff, Ralph N Martins
Evidence suggests that a diet low in carbohydrates can impact on cognitive performance among those with Alzheimer's disease (AD). However, there is a lack of data assessing this relationship among cognitively normal (CN) older adults at increased future risk of developing AD due to carriage of the apolipoprotein E (APOE) ɛ4 allele. We assessed the cross-sectional association between carbohydrate intake, cognitive performance, and cerebral amyloid-β (Aβ) load in CN older adults, genotyped for APOEɛ4 allele carrier status...
April 3, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28356228/co-injection-of-a%C3%AE-1-40-and-apoe4-impaired-spatial-memory-and-hippocampal-long-term-potentiation-in-rats
#6
Meina Wu, Yexin He, Jun Zhang, Junting Yang, Jinshun Qi
Apolipoprotein E4 (APOE4) allele located on chromosome 19 is a major genetic risk factor for developing Alzheimer's disease (AD). However, the direct effects of ApoE4 on the cognitive function and long-term synaptic plasticity have not fully investigated. At the same time, although amyloid beta protein (Aβ)-ApoE complexes are principal components of AD-associated brain damage, there is still lack of in vivo study on the effects of co-existed Aβ1-40 and ApoE4. In the present study, we examined the effects of ApoE4 on the spatial memory and hippocampal long term potentiation (LTP) by using Morris water maze test and in vivo field potential recording, compared the neurotoxicity of Aβ1-40 and ApoE4, and investigated the effects of co-application of Aβ1-40 and ApoE4 on cognitive behavior and synaptic plasticity...
March 27, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28350795/fine-mapping-of-the-human-leukocyte-antigen-locus-as-a-risk-factor-for-alzheimer-disease-a-case-control-study
#7
Natasha Z R Steele, Jessie S Carr, Luke W Bonham, Ethan G Geier, Vincent Damotte, Zachary A Miller, Rahul S Desikan, Kevin L Boehme, Shubhabrata Mukherjee, Paul K Crane, John S K Kauwe, Joel H Kramer, Bruce L Miller, Giovanni Coppola, Jill A Hollenbach, Yadong Huang, Jennifer S Yokoyama
BACKGROUND: Alzheimer disease (AD) is a progressive disorder that affects cognitive function. There is increasing support for the role of neuroinflammation and aberrant immune regulation in the pathophysiology of AD. The immunoregulatory human leukocyte antigen (HLA) complex has been linked to susceptibility for a number of neurodegenerative diseases, including AD; however, studies to date have failed to consistently identify a risk HLA haplotype for AD. Contributing to this difficulty are the complex genetic organization of the HLA region, differences in sequencing and allelic imputation methods, and diversity across ethnic populations...
March 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28344553/youthful-processing-speed-in-older-adults-genetic-biological-and-behavioral-predictors-of-cognitive-processing-speed-trajectories-in-aging
#8
Nicholas T Bott, Brianne M Bettcher, Jennifer S Yokoyama, Darvis T Frazier, Matthew Wynn, Anna Karydas, Kristine Yaffe, Joel H Kramer
Objective: To examine the impact of genetic, inflammatory, cardiovascular, lifestyle, and neuroanatomical factors on cognitive processing speed (CPS) change over time in functionally intact older adults. Methods: This observational study conducted over two time points, included 120 community dwelling cognitively normal older adults between the ages of 60 and 80 from the University of California San Francisco Memory and Aging Center. Participants were followed with composite measures of CPS, calculated based on norms for 20-30 year-olds...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28337631/upregulation-of-mineralocorticoid-receptor-in-the-hypothalamus-associated-with-a-high-anxiety-like-level-in-apolipoprotein-e4-transgenic-mice
#9
Fan-Tao Meng, Jun Zhao, Hui Fang, Li-Feng Zhang, Hui-Mei Wu, Ya-Jing Liu
Anxiety symptoms occur in a large portion of Alzheimer's disease (AD) patients. ApolipoproteinE-4 (ApoE ε4 allele), a risk factor for AD, has been recognized as an important contributor to psychiatric disorders. In the present study, we aimed to investigate the corticosterone level in relation to anxiety-like behavior changes in transgenic male mice with different glial fibrillary acidic protein (GFAP)-ApoE isoforms. GFAP-ApoE4 transgenic mice aged 3 months showed higher anxiety-like behavior in open field, light-dark box and elevated plus maze tasks compared with that of age-matched GFAP-ApoE3 mice...
March 24, 2017: Behavior Genetics
https://www.readbyqxmd.com/read/28335828/dha-brain-uptake-and-apoe4-status-a-pet-study-with-1-11-c-dha
#10
Hussein N Yassine, Etienne Croteau, Varun Rawat, Joseph R Hibbeln, Stanley I Rapoport, Stephen C Cunnane, John C Umhau
BACKGROUND: The apolipoprotein E ɛ4 (APOE4) allele is the strongest genetic risk factor identified for developing Alzheimer's disease (AD). Among brain lipids, alteration in the ω-3 polyunsaturated fatty acid docosahexaenoic acid (DHA) homeostasis is implicated in AD pathogenesis. APOE4 may influence both brain DHA metabolism and cognitive outcomes. METHODS: Using positron emission tomography, regional incorporation coefficients (k*), rates of DHA incorporation from plasma into the brain using [1-(11)C]-DHA (J in), and regional cerebral blood flow using [(15)O]-water were measured in 22 middle-aged healthy adults (mean age 35 years, range 19-65 years)...
March 23, 2017: Alzheimer's Research & Therapy
https://www.readbyqxmd.com/read/28329797/social-connectedness-perceived-isolation-and-dementia-does-the-social-environment-moderate-the-relationship-between-genetic-risk-and-cognitive-well-being
#11
Judith L Poey, Jeffrey A Burr, J Scott Roberts
Purpose of the Study: This study examined whether the social environment moderates the relationship between the APOE e4 allele and cognitive functioning. Design and Methods: The Aging, Demographics, and Memory Study (ADAMS) data and multinomial logistic regression models were used to investigate these relationships for a nationally representative sample of U.S. adults aged 70 and older (n = 779). Results: Living alone (relative risk ratio [RRR] = 5...
January 24, 2017: Gerontologist
https://www.readbyqxmd.com/read/28326331/effects-of-apolipoprotein-e-isoforms-in-diabetic-nephropathy-of-chinese-type-2-diabetic-patients
#12
YongWei Jiang, Liang Ma, ChengWu Han, Qian Liu, Xiao Cong, YaPing Xu, TingTing Zhao, Ping Li, YongTong Cao
Diabetic nephropathy (DN) is one of the major chronic complications of diabetes. Genetic polymorphism of Apolipoprotein E (ApoE) has been proposed to participating in DN. The purpose of the study was to evaluate the relationship between ApoE genetic polymorphism and the presence of DN in Chinese type 2 diabetic patients. We studied 845 diabetic patients who were divided into DN group (n = 429) and control group (n = 416). ApoE genotype was determined by ApoE genotyping chip and the plasmatic biochemical characterization was performed on all subjects...
2017: Journal of Diabetes Research
https://www.readbyqxmd.com/read/28324763/interaction-of-apoe-e4-and-poor-glycemic-control-predicts-white-matter-hyperintensity-growth-from-73-to-76
#13
Simon R Cox, Stuart J Ritchie, David Alexander Dickie, Alison Pattie, Natalie A Royle, Janie Corley, Benjamin S Aribisala, Sarah E Harris, Maria Valdés Hernández, Alan J Gow, Susana Muñoz Maniega, John M Starr, Mark E Bastin, Joanna M Wardlaw, Ian J Deary
We examined whether apolipoprotein E (APOE) status interacts with vascular risk factors (VRFs) to predict the progression of white matter hyperintensities (WMHs) on brain MRI scans over a specific period of life in older age when the risk of dementia increases. At age 73 years, baseline VRFs were assessed via self-reported history of diabetes, hypertension, smoking, and hypercholesterolemia, and via objective measures of blood HbA1c, body mass index, diastolic and systolic blood pressure, and blood high-density lipoprotein to total cholesterol (HDL) ratio...
February 27, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28323826/apoe-related-risk-of-mild-cognitive-impairment-and-dementia-for-prevention-trials-an-analysis-of-four-cohorts
#14
Jing Qian, Frank J Wolters, Alexa Beiser, Mary Haan, M Arfan Ikram, Jason Karlawish, Jessica B Langbaum, John M Neuhaus, Eric M Reiman, J Scott Roberts, Sudha Seshadri, Pierre N Tariot, Beth McCarty Woods, Rebecca A Betensky, Deborah Blacker
BACKGROUND: With the onset of prevention trials for individuals at high risk for Alzheimer disease, there is increasing need for accurate risk prediction to inform study design and enrollment, but available risk estimates are limited. We developed risk estimates for the incidence of mild cognitive impairment (MCI) or dementia among cognitively unimpaired individuals by APOE-e4 dose for the genetic disclosure process of the Alzheimer's Prevention Initiative Generation Study, a prevention trial in cognitively unimpaired APOE-e4/e4 homozygote individuals...
March 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28321820/apolipoprotein-e4-suppresses-neuronal-specific-gene-expression-in-maturing-neuronal-progenitor-cells-exposed-to-hiv
#15
Rebeca Geffin, Ricardo Martinez, Alicia de Las Pozas, Biju Issac, Micheline McCarthy
The apolipoprotein ε4 gene allele and the apolipoprotein E4 protein (ApoE4) are important host susceptibility factors linked to neurocognitive disorders associated with HIV infection or Alzheimer's disease. Our previous studies showed differential effects of the two most common human ApoE genotypes, APOE3/3 and APOE3/4, on gene expression by differentiating human neuroepithelial progenitor cells continuously exposed to HIV. To investigate the effects of ApoE3 versus ApoE4 isoforms specifically on maturing neurons, we adapted a human neuronal progenitor cell line, hNP1, with ApoE genotype APOE3/3...
March 20, 2017: Journal of Neuroimmune Pharmacology: the Official Journal of the Society on NeuroImmune Pharmacology
https://www.readbyqxmd.com/read/28304301/modeling-the-relationships-among-late-life-body-mass-index-cerebrovascular-disease-and-alzheimer-s-disease-neuropathology-in-an-autopsy-sample-of-1-421-subjects-from-the-national-alzheimer-s-coordinating-center-data-set
#16
Michael L Alosco, Jonathan Duskin, Lilah M Besser, Brett Martin, Christine E Chaisson, John Gunstad, Neil W Kowall, Ann C McKee, Robert A Stern, Yorghos Tripodis
The relationship between late-life body mass index (BMI) and Alzheimer's disease (AD) is poorly understood due to the lack of research in samples with autopsy-confirmed AD neuropathology (ADNP). The role of cerebrovascular disease (CVD) in the interplay between late-life BMI and ADNP is unclear. We conducted a retrospective longitudinal investigation and used joint modeling of linear mixed effects to investigate causal relationships among repeated antemortem BMI measurements, CVD (quantified neuropathologically), and ADNP in an autopsy sample of subjects across the AD clinical continuum...
March 13, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28299413/apolipoprotein-e-the-resilience-gene
#17
Lisa M James, Brian E Engdahl, Apostolos P Georgopoulos
The apolipoprotein E (apoE) gene has been implicated in various conditions, most notably Alzheimer's disease and coronary artery disease. A predisposing role of the apoE4 isoform and a protective role of apoE2 isoform in those diseases have been documented. Here we investigated the role of apoE in resilience to trauma. Three hundred and forty-three US veterans were genotyped for apoE and were assessed for their lifetime trauma exposure (trauma score, T) and severity of posttraumatic stress disorder symptoms (PCL)...
March 15, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28292942/the-apoe-receptors-vldlr-and-apoer2-in-central-nervous-system-function-and-disease
#18
Courtney Lane-Donovan, Joachim Herz
The low-density lipoprotein receptor (LDLR) family has long been studied for its role in cholesterol transport and metabolism; however, the identification of apolipoprotein E4 (ApoE4), an LDLR ligand, as a genetic risk factor for late-onset Alzheimers disease (AD) has focused attention on the role this receptor family plays in the central nervous system (CNS). Surprisingly, it was discovered that two LDLR family members, Apolipoprotein E receptor 2 (Apoer2) and very-low-density lipoprotein receptor (Vldlr), play key roles in brain development and adult synaptic plasticity, primarily by mediating Reelin signaling...
March 14, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28291794/few-serum-proteins-mediate-apoe-s-association-with-dementia
#19
Donald R Royall, Safa Al-Rubaye, Ram Bishnoi, Raymond F Palmer
The latent variable "δ" (for "dementia") appears to be uniquely responsible for the dementing aspects of cognitive impairment. Age, depression, gender and the apolipoprotein E (APOE) e4 allele are independently associated with δ. In this analysis, we explore serum proteins as potential mediators of APOE's specific association with δ in a large, ethnically diverse longitudinal cohort, the Texas Alzheimer's Research and Care Consortium (TARCC). APOE was associated only with C-Reactive Protein (CRP), Adiponectin (APN) and Amphiregulin (AREG), although the latter two's associations did not survive Bonferroni correction for multiple comparisons...
2017: PloS One
https://www.readbyqxmd.com/read/28285306/extremely-low-prevalence-of-amyloid-positron-emission-tomography-positivity-in-parkinson-s-disease-without-dementia
#20
Kyoko Mashima, Daisuke Ito, Masashi Kameyama, Takashi Osada, Hajime Tabuchi, Yoshihiro Nihei, Takahito Yoshizaki, Eri Noguchi, Mariko Tanikawa, Takashi Iizuka, Yugaku Date, Yuji Ogata, Tadaki Nakahara, Yu Iwabuchi, Masahiro Jinzaki, Koji Murakami, Norihiro Suzuki
BACKGROUND: Most cases of dementia with Lewy bodies (DLB) show Alzheimer's disease pathology-like senile plaques and neurofibrillary tangles. Several studies have also revealed a high prevalence of positive amyloid imaging with positron emission tomography (PET) in DLB and moderate prevalence in Parkinson's disease (PD) with dementia. However, it remains unclear in PD without dementia as to when the brain β amyloid (Aβ) burden begins and progresses. Our study aimed to determine the prevalence of Aβ deposition in PD without dementia using amyloid PET...
March 11, 2017: European Neurology
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