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https://www.readbyqxmd.com/read/27911306/cortical-thickness-and-microstructural-white-matter-changes-detect-amnestic-mild-cognitive-impairment
#1
Zan Wang, Zhengjia Dai, Hao Shu, Duan Liu, Qihao Guo, Yong He, Zhijun Zhang
Both the apolipoprotein E (APOE) ɛ4 allele and amnestic mild cognitive impairment (aMCI) are considered to be risk factors for Alzheimer's disease (AD). The primary aim of this study was to determine whether the aMCI-related abnormality in gray matter (GM) cortical thickness and white matter (WM) tracts integrity would be modified by the APOE genotype. A total of 146 older adults, including 64 aMCI patients (28 ɛ4 carriers and 36 non-carriers) and 82 healthy controls (39 ɛ4 carriers and 43 non-carriers), underwent a standardized clinical interview, neuropsychological battery assessment, and multi-modal brain magnetic resonance imaging scans...
November 29, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27911301/tau-platelets-correlate-with-regional-brain%C3%A2-atrophy-in-patients-with-alzheimer-s%C3%A2-disease
#2
Andrea Slachevsky, Leonardo Guzmán-Martínez, Carolina Delgado, Pablo Reyes, Gonzalo A Farías, Carlos Muñoz-Neira, Eduardo Bravo, Mauricio Farías, Patricia Flores, Cristian Garrido, James T Becker, Oscar L López, Ricardo B Maccioni
BACKGROUND: Intracellular neurofibrillary tangles are part of the core pathology of Alzheimer's disease (AD), which are mainly composed of hyperphosphorylated tau protein. OBJECTIVES: The purpose of this study is to determine whether high molecular weight (HMW) or low molecular weight (LMW) tau protein levels, as well as the ratio HMW/LMW, present in platelets correlates with brain magnetic resonance imaging (MRI) structural changes in normal and cognitively impaired subjects...
November 26, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27911019/the-impact-and-measurement-of-social-dysfunction-in-late-life-depression-an-evaluation-of-current-methods-with-a-focus-on-wearable-technology
#3
REVIEW
Sophie Hodgetts, Peter Gallagher, Daniel Stow, I Nicol Ferrier, John T O'Brien
OBJECTIVE: Depression is known to negatively impact social functioning, with patients commonly reporting difficulties maintaining social relationships. Moreover, a large body of evidence suggests poor social functioning is not only present in depression but that social functioning is an important factor in illness course and outcome. In addition, good social relationships can play a protective role against the onset of depressive symptoms, particularly in late-life depression. However, the majority of research in this area has employed self-report measures of social function...
December 2, 2016: International Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/27909401/implicit-learning-in-transient-global-amnesia-and-the-role-of-stress
#4
Frauke Nees, Martin Griebe, Anne Ebert, Michaela Ruttorf, Benjamin Gerber, Oliver T Wolf, Lothar R Schad, Achim Gass, Kristina Szabo
Transient global amnesia (TGA) is a disorder with reversible anterograde disturbance of explicit memory, frequently preceded by an emotionally or physically stressful event. By using magnetic resonance imaging (MRI) following an episode of TGA, small hippocampal lesions have been observed. Hence it has been postulated that the disorder is caused by the stress-related transient inhibition of memory formation in the hippocampus. In experimental studies, stress has been shown to affect both explicit and implicit learning-the latter defined as learning and memory processes that lack conscious awareness of the information acquired...
2016: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/27904710/the-comt-rs165599-gene-polymorphism-contributes-to-chemotherapy-induced-cognitive-impairment-in-breast-cancer-patients
#5
Huaidong Cheng, Wen Li, Chen Gan, Bo Zhang, Qianqian Jia, Kai Wang
The present study aimed to investigate the effect of genetic polymorphisms of catechol-O-methyl transferase (COMT), apolipoprotein E (APOE), and brain derived neurotrophic factor (BDNF) on the modulation of the chemotherapy-induced cognitive impairment (CICI) in breast cancer patients. Eighty triple negative breast cancer (TNBC) and 165 non-triple negative breast cancer (NTNBC) patients were selected, and subjected to a number of neuropsychological tests, including memory questionnaires, before and after chemotherapy...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27903289/changes-in-cerebral-glucose-metabolism-after-3%C3%A2-weeks-of-noninvasive-electrical-stimulation-of-mild-cognitive-impairment-patients
#6
Kyongsik Yun, In-Uk Song, Yong-An Chung
BACKGROUND: Mild cognitive impairment (MCI) is a syndrome that disrupts an individual's cognitive function but preserves activities of daily living. MCI is thought to be a prodromal stage of dementia, which disrupts patients' daily lives and causes severe cognitive dysfunction. Although extensive clinical trials have attempted to slow or stop the MCI to dementia conversion, the results have been largely unsuccessful. The purpose of this study was to determine whether noninvasive electrical stimulation of MCI changes glucose metabolism...
December 1, 2016: Alzheimer's Research & Therapy
https://www.readbyqxmd.com/read/27898071/are-adolescents-more-vulnerable-to-the-harmful-effects-of-cannabis-than-adults-a-placebo-controlled-study-in-human-males
#7
C Mokrysz, T P Freeman, S Korkki, K Griffiths, H V Curran
Preclinical research demonstrates that cannabinoids have differing effects in adolescent and adult animals. Whether these findings translate to humans has not yet been investigated. Here we believe we conducted the first study to compare the acute effects of cannabis in human adolescent (n=20; 16-17 years old) and adult (n=20; 24-28 years old) male cannabis users, in a placebo-controlled, double-blind cross-over design. After inhaling vaporized active or placebo cannabis, participants completed tasks assessing spatial working memory, episodic memory and response inhibition, alongside measures of blood pressure and heart rate, psychotomimetic symptoms and subjective drug effects (for example, 'stoned', 'want to have cannabis')...
November 29, 2016: Translational Psychiatry
https://www.readbyqxmd.com/read/27896065/analysis-of-ageing-associated-grey-matter-volume-in-patients-with-multiple-sclerosis-shows-excess-atrophy-in-subcortical-regions
#8
Courtney A Bishop, Rexford D Newbould, Jean Sz Lee, Lesley Honeyfield, Rebecca Quest, Alessandro Colasanti, Rehiana Ali, Miriam Mattoscio, Antonio Cortese, Richard Nicholas, Paul M Matthews, Paolo A Muraro, Adam D Waldman
Age of onset in multiple sclerosis (MS) exerts an influence on the course of disease. This study examined whether global and regional brain volumes differed between "younger" and "older" onset MS subjects who were matched for short disease duration, mean 1.9 years and burden as measured by the MS Severity Score and relapses. 21 younger-onset MS subjects (age 30.4 ± 3.2 years) were compared with 17 older-onset (age 48.7 ± 3.3 years) as well as age-matched controls (n = 31, 31.9 ± 3.5 years and n = 21, 47...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27890591/circadian-waveform-bifurcation-but-not-phase-shifting-leaves-cued-fear-memory-intact
#9
E M Harrison, S A Carmack, C L Block, J Sun, S G Anagnostaras, M R Gorman
In mammals, memory acquisition and retrieval can be affected by time of day, as well as by manipulations of the light/dark cycle. Under bifurcation, a manipulation of circadian waveform, two subjective days and nights are experimentally induced in rodents. We examined the effect of bifurcation on Pavlovian fear conditioning, a prominent model of learning and memory. Here we demonstrate that bifurcation of the circadian waveform produces a small deficit in acquisition, but not on retrieval of fear memory. In contrast, repeated phase-shifting in a simulated jet-lag protocol impairs retrieval of memory for cued fear...
November 24, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27889770/usefulness-of-discriminability-and-response-bias-indices-for-the-evaluation-of-recognition-memory-in-mild-cognitive-impairment-and-alzheimer-disease
#10
María Julieta Russo, Gabriela Cohen, Jorge Campos, Maria Eugenia Martin, María Florencia Clarens, Liliana Sabe, Ernesto Barcelo, Ricardo F Allegri
BACKGROUND: Most studies examining episodic memory in Alzheimer disease (AD) have focused on patients' impaired ability to remember information. This approach provides only a partial picture of memory deficits since other factors involved are not considered. OBJECTIVE: To evaluate the recognition memory performance by using a yes/no procedure to examine the effect of discriminability and response bias measures in amnestic mild cognitive impairment (a-MCI), AD dementia, and normal-aging subjects...
November 26, 2016: Dementia and Geriatric Cognitive Disorders
https://www.readbyqxmd.com/read/27883250/3d-tract-specific-local-and-global-analysis-of-white-matter-integrity-in-alzheimer-s-disease
#11
Yan Jin, Chao Huang, Madelaine Daianu, Liang Zhan, Emily L Dennis, Robert I Reid, Clifford R Jack, Hongtu Zhu, Paul M Thompson
Alzheimer's disease (AD) is a chronic neurodegenerative disease characterized by progressive decline in memory and other aspects of cognitive function. Diffusion-weighted imaging (DWI) offers a non-invasive approach to delineate the effects of AD on white matter (WM) integrity. Previous studies calculated either some summary statistics over regions of interest (ROI analysis) or some statistics along mean skeleton lines (Tract Based Spatial Statistic [TBSS]), so they cannot quantify subtle local WM alterations along major tracts...
November 24, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27882565/tanshinone-iia-attenuates-a%C3%AE-25-35-induced-spatial-memory-impairment-via-upregulating-receptors-for-activated-c-kinase1-and-inhibiting-autophagy-in-hippocampus
#12
Jiejun Zhu, Shiping Liao, Liming Zhou, Lihong Wan
OBJECTIVES: Tanshinone IIA (Tan IIA) may exert significant protective effects against the neurotoxicity induced by β-amyloid protein (Aβ). This study was designed to investigate the possible neuroprotective mechanism of Tan IIA on Aβ25-35 -induced spatial memory impairment in mice. METHODS: After 3 weeks of preventive treatment (Tan IIA or oil), all male Kunming mice were subjected to Aβ25-35 (10 μl, intracerebroventricularly (i.c.v.)) to establish the spatial memory impairment model...
November 23, 2016: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/27881956/ovarian-sex-hormones-modulate-compulsive-affective-and-cognitive-functions-in-a-non-induced-mouse-model-of-obsessive-compulsive-disorder
#13
Swarup Mitra, Cristiane P Bastos, Katherine Bates, Grace S Pereira, Abel Bult-Ito
There is currently a lack of understanding of how surgical menopause can influence obsessions, compulsions and associated affective and cognitive functions in female obsessive-compulsive disorder (OCD) patients. Early menopause in women due to surgical removal of ovaries not only causes dramatic hormonal changes, but also may induce affective and cognitive disorders. Here, we tested if surgical removal of ovaries (ovariectomy, OVX), which mimics surgical menopause in humans, would result in exacerbation of compulsive, affective and cognitive behaviors in mice strains that exhibit a spontaneous compulsive-like phenotype...
2016: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/27878873/the-effects-of-spaced-retrieval-training-in-improving-hyperphagia-of-people-living-with-dementia-in-residential-settings
#14
Chia-Ning Hsu, Li-Chan Lin, Shiao-Chi Wu
AIMS AND OBJECTIVES: To investigate the effectiveness of spaced retrieval for improving hyperphagia in patients with dementia in residential care settings. BACKGROUND: Although 10-30% of patients with dementia have hyperphagia, most studies have focused on eating difficulties. Only a few studies have focused on hyperphagia. Various memory problems cause hyperphagia in patients with dementia. Spaced retrieval (SR), a cognitive technique for information learning, can be used as a training method to improve memory loss...
November 22, 2016: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/27878440/cognitive-dysfunction-in-patients-with-spinocerebellar-ataxia-type-6
#15
Itaru Tamura, Asako Takei, Shinsuke Hamada, Michio Nonaka, Yoshiko Kurosaki, Fumio Moriwaka
The aim of this study was to assess the cognitive functions of patients with spinocerebellar ataxia type 6 (SCA6). We examined 13 patients with genetically confirmed SCA6 and 13 healthy control subjects matched for age, years of education, global cognitive status, and intellectual ability. We administered verbal memory (word recall and word recognition), executive function (digit span, category and letter fluency, Frontal Assessment Battery, and Trail Making Test-A and B), and visuospatial construction (figure copying) tests...
November 22, 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27876790/stress-induces-a-shift-towards-striatum-dependent-stimulus-response-learning-via-the-mineralocorticoid-receptor
#16
Susanne Vogel, Floris Klumpers, Tobias Navarro Schröder, Krista T Oplaat, Harm J Krugers, Melly S Oitzl, Marian Joëls, Christian F Doeller, Guillén Fernández
Stress is assumed to cause a shift from flexible 'cognitive' memory to more rigid 'habit' memory. In the spatial memory domain, stress impairs place learning depending on the hippocampus whereas stimulus-response learning based on the striatum appears to be improved. While the neural basis of this shift is still unclear, previous evidence in rodents points towards cortisol interacting with the mineralocorticoid receptor (MR) to affect amygdala functioning. The amygdala is in turn assumed to orchestrate the stress-induced shift in memory processing...
November 23, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27874266/meta-analysis-of-neuropsychological-measures-of-executive-functioning-in-children-and-adolescents-with-high-functioning-autism-spectrum-disorder
#17
Chun Lun Eric Lai, Zoe Lau, Simon S Y Lui, Eugenia Lok, Venus Tam, Quinney Chan, Koi Man Cheng, Siu Man Lam, Eric F C Cheung
Existing literature on the profile of executive dysfunction in autism spectrum disorder showed inconsistent results. Age, comorbid attention-deficit/hyperactivity disorder (ADHD) and cognitive abilities appeared to play a role in confounding the picture. Previous meta-analyses have focused on a few components of executive functions. This meta-analysis attempted to delineate the profile of deficit in several components of executive functioning in children and adolescents with high-functioning autism spectrum disorder (HFASD)...
November 22, 2016: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/27866942/a-review-of-molecular-genetic-studies-of-neurocognitive-deficits-in-schizophrenia
#18
REVIEW
Gwyneth Zai, Trevor W Robbins, Barbara J Sahakian, James L Kennedy
Schizophrenia is a complex and debilitating illness with strong genetic loading. In line with its heterogeneous symptomatology, evidence suggests genetic etiologies for the phenotypes in schizophrenia. A search across endophenotypes has pointed towards consistent findings in its neurocognitive deficits. Extensive literature has demonstrated impaired cognition including executive function, attention, and memory in schizophrenia patients when compared to healthy subjects. This review (1) provides an overview of recent studies and (2) develops an up-to-date conceptualization of genetic variations influencing neurocognitive functions in schizophrenia patients...
November 17, 2016: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/27862185/short-term-exposure-to-enriched-environment-rescues-chronic-stress-induced-impaired-hippocampal-synaptic-plasticity-anxiety-and-memory-deficits
#19
VenkannaRao Bhagya, Bettadapura N Srikumar, Jayagopalan Veena, Byrathnahalli S Shankaranarayana Rao
Exposure to prolonged stress results in structural and functional alterations in the hippocampus including reduced long-term potentiation (LTP), neurogenesis, spatial learning and working memory impairments, and enhanced anxiety-like behavior. On the other hand, enriched environment (EE) has beneficial effects on hippocampal structure and function, such as improved memory, increased hippocampal neurogenesis, and progressive synaptic plasticity. It is unclear whether exposure to short-term EE for 10 days can overcome restraint stress-induced cognitive deficits and impaired hippocampal plasticity...
November 16, 2016: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/27861555/p16ink4a-expression-and-immunologic-aging-in-chronic-hiv-infection
#20
Susan Pereira Ribeiro, Jeffrey M Milush, Edecio Cunha-Neto, Esper G Kallas, Jorge Kalil, Luiz Felipe D Passero, Peter W Hunt, Steven G Deeks, Douglas F Nixon, Devi SenGupta
Chronic HIV infection is characterized by increased immune activation and immunosenescence. p16 INK4a (p16) is a member of the cyclin-dependent kinase antagonist family that inhibits cellular proliferation, and its protein expression increases during normal chronological aging. However, some infectious diseases can increase the expression of this anti-proliferative protein, potentially accelerating immunological aging and dysfunction. In order to investigate the immunological aging in HIV patients, p16 protein expression was evaluated by flow cytometry, in T cell subsets in a cohort of chronically HIV-infected patients on and off ART as well as age-matched healthy controls...
2016: PloS One
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