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https://www.readbyqxmd.com/read/27933582/microrna-181c-ameliorates-cognitive-impairment-induced-by-chronic-cerebral-hypoperfusion-in-rats
#1
Chen Fang, Qian Li, Guowen Min, Min Liu, Jing Cui, Jing Sun, Liang Li
Chronic cerebral hypoperfusion (CCH) characterized by global cerebral ischemia is an important risk factor contributing to the development of dementia. MicroRNAs (miRNAs) play important roles in the cellular adaptation to long-term ischemia/hypoxia by turning off or on the expression of target genes. MiR-181c is widely expressed in the nervous system, and tripartite motif 2 (TRIM2) is one of its target genes. In this work, we had identified that progressive spatial memory deficiency was induced in the bilateral common carotid artery occlusion (2-VO) rat models...
December 8, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27933449/clearing-the-fog-a-review-of-the-effects-of-dietary-omega-3-fatty-acids-and-added-sugars-on-chemotherapy-induced-cognitive-deficits
#2
REVIEW
Tonya S Orchard, Monica M Gaudier-Diaz, Kellie R Weinhold, A Courtney DeVries
Cancer treatments such as chemotherapy have been an important part of extending survival in women diagnosed with breast cancer. However, chemotherapy can cause potentially toxic side effects in the brain that impair memory, verbal fluency, and processing speed in up to 30% of women treated. Women report that post-chemotherapy cognitive deficits negatively impact quality of life and may last up to ten years after treatment. Mechanisms underlying these cognitive impairments are not fully understood, but emerging evidence suggests that chemotherapy induces structural changes in the brain, produces neuroinflammation, and reduces adult hippocampal neurogenesis...
December 8, 2016: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/27933019/reduced-working-memory-mediates-the-link-between-early-institutional-rearing-and-symptoms-of-adhd-at-12-years
#3
Florin Tibu, Margaret A Sheridan, Katie A McLaughlin, Charles A Nelson, Nathan A Fox, Charles H Zeanah
Children who are raised in institutions show severe delays across multiple domains of development and high levels of psychopathology, including attention deficit/hyperactivity disorder (ADHD). Low performance in executive functions (EFs) are also common in institutionally reared children and often do not remediate following improvements in the caregiving environment. ADHD symptomatology also remains elevated even after children are removed from institutional care and placed in families. We investigate whether poor EF is a mechanism explaining elevated rates of ADHD in children reared in institutional settings in the Bucharest Early Intervention Project (BEIP)...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27932983/cannabidiol-regulation-of-learned-fear-implications-for-treating-anxiety-related-disorders
#4
Regimantas Jurkus, Harriet L L Day, Francisco S Guimarães, Jonathan L C Lee, Leandro J Bertoglio, Carl W Stevenson
Anxiety and trauma-related disorders are psychiatric diseases with a lifetime prevalence of up to 25%. Phobias and post-traumatic stress disorder (PTSD) are characterized by abnormal and persistent memories of fear-related contexts and cues. The effects of psychological treatments such as exposure therapy are often only temporary and medications can be ineffective and have adverse side effects. Growing evidence from human and animal studies indicates that cannabidiol, the main non-psychotomimetic phytocannabinoid present in Cannabis sativa, alleviates anxiety in paradigms assessing innate fear...
2016: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/27932977/human-neural-stem-cell-transplantation-rescues-cognitive-defects-in-app-ps1-model-of-alzheimer-s-disease-by-enhancing-neuronal-connectivity-and-metabolic-activity
#5
Xueyuan Li, Hua Zhu, Xicai Sun, Fuxing Zuo, Jianfeng Lei, Zhanjing Wang, Xinjie Bao, Renzhi Wang
Alzheimer's disease (AD), the most frequent type of dementia, is featured by Aβ pathology, neural degeneration and cognitive decline. To date, there is no cure for this disease. Neural stem cell (NSC) transplantation provides new promise for treating AD. Many studies report that intra-hippocampal transplantation of murine NSCs improved cognition in rodents with AD by alleviating neurodegeneration via neuronal complement or replacement. However, few reports examined the potential of human NSC transplantation for AD...
2016: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/27932963/distinct-neural-substrates-for-maintaining-locations-and-spatial-relations-in-working-memory
#6
Kara J Blacker, Susan M Courtney
Previous work has demonstrated a distinction between maintenance of two types of spatial information in working memory (WM): spatial locations and spatial relations. While a body of work has investigated the neural mechanisms of sensory-based information like spatial locations, little is known about how spatial relations are maintained in WM. In two experiments, we used fMRI to investigate the involvement of early visual cortex in the maintenance of spatial relations in WM. In both experiments, we found less quadrant-specific BOLD activity in visual cortex when a single spatial relation, compared to a single spatial location, was held in WM...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27932852/evolutionary-connectionism-algorithmic-principles-underlying-the-evolution-of-biological-organisation-in-evo-devo-evo-eco-and-evolutionary-transitions
#7
Richard A Watson, Rob Mills, C L Buckley, Kostas Kouvaris, Adam Jackson, Simon T Powers, Chris Cox, Simon Tudge, Adam Davies, Loizos Kounios, Daniel Power
The mechanisms of variation, selection and inheritance, on which evolution by natural selection depends, are not fixed over evolutionary time. Current evolutionary biology is increasingly focussed on understanding how the evolution of developmental organisations modifies the distribution of phenotypic variation, the evolution of ecological relationships modifies the selective environment, and the evolution of reproductive relationships modifies the heritability of the evolutionary unit. The major transitions in evolution, in particular, involve radical changes in developmental, ecological and reproductive organisations that instantiate variation, selection and inheritance at a higher level of biological organisation...
2016: Evolutionary Biology
https://www.readbyqxmd.com/read/27932619/ontogeny-of-cd4-t-lymphocytes-with-phenotypic-susceptibility-to-hiv-1-during-exclusive-and-non-exclusive-breastfeeding-in-hiv-1-exposed-ugandan-infants
#8
Elizabeth J McFarland, Tina M Powell, Carolyne Onyango-Makumbi, Weiming Zhang, Kelsey Melander, Prossy Naluyima, Samuel Okurut, Michael A Eller, Mary Glenn Fowler, Edward N Janoff
BACKGROUND: Among HIV-1-exposed infants, mixed breastfeeding is associated with higher postnatal HIV-1 transmission than exclusive breastfeeding, but the mechanisms of this differential risk are uncertain. METHODS: HIV-1-exposed, Ugandan infants were prospectively assessed over the first year of life for feeding practices and T cell maturation, intestinal homing (β7(hi)), activation, and HIV-1 co-receptor (CCR5) expression in peripheral blood. Infants receiving only breast milk and those with introduction of other foods prior to 6 months, categorized as exclusive and non-exclusive, respectively...
December 8, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27932388/from-embryo-to-adult-pirna-mediated-silencing-throughout-germline-development-in-drosophila
#9
Pauline P Marie, Stéphane Ronsseray, Antoine Boivin
In metazoan germ cells, transposable element activity is repressed by small noncoding PIWI-associated RNAs (piRNAs). Numerous studies in Drosophila have elucidated the mechanism of this repression in the adult germline. However, when and how transposable element repression is established during germline development, has not been addressed. Here, we show that homology-dependent trans silencing is active in female primordial germ cells from late embryogenesis through pupal stages, and that genes related to the adult piRNA pathway are required for silencing during development...
December 7, 2016: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/27932366/sauna-bathing-is-inversely-associated-with-dementia-and-alzheimer-s-disease-in-middle-aged-finnish-men
#10
Tanjaniina Laukkanen, Setor Kunutsor, Jussi Kauhanen, Jari Antero Laukkanen
BACKGROUND: there are no previous studies linking repeated heat exposure of sauna and the risk of memory diseases. We aimed to investigate whether frequency of sauna bathing is associated with risk of dementia and Alzheimer's disease. SETTING: prospective population-based study. METHODS: the frequency of sauna bathing was assessed at baseline in the Kuopio Ischaemic Heart Disease population-based prospective cohort study of 2,315 apparently healthy men aged 42-60 years at baseline, with baseline examinations conducted between 1984 and 1989...
December 7, 2016: Age and Ageing
https://www.readbyqxmd.com/read/27932026/gene-environment-interactions-in-cortical-interneuron-development-and-dysfunction-a-review-of-preclinical-studies
#11
REVIEW
Lydia J Ansen-Wilson, Robert J Lipinski
Cortical interneurons (cINs) are a diverse group of locally projecting neurons essential to the organization and regulation of neural networks. Though they comprise only ∼20% of neurons in the neocortex, their dynamic modulation of cortical activity is requisite for normal cognition and underlies multiple aspects of learning and memory. While displaying significant morphological, molecular, and electrophysiological variability, cINs collectively function to maintain the excitatory-inhibitory balance in the cortex by dampening hyperexcitability and synchronizing activity of projection neurons, primarily through use of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA)...
December 5, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27930903/brain-mechanisms-underlying-the-brief-maintenance-of-seen-and-unseen-sensory-information
#12
Jean-Rémi King, Niccolo Pescetelli, Stanislas Dehaene
Recent evidence of unconscious working memory challenges the notion that only visible stimuli can be actively maintained over time. In the present study, we investigated the neural dynamics underlying the maintenance of variably visible stimuli using magnetoencephalography. Subjects had to detect and mentally maintain the orientation of a masked grating. We show that the stimulus is fully encoded in early brain activity independently of visibility reports. However, the presence and orientation of the target are actively maintained throughout the brief retention period, even when the stimulus is reported as unseen...
December 7, 2016: Neuron
https://www.readbyqxmd.com/read/27930664/reliable-analysis-of-single-unit-recordings-from-the-human-brain-under-noisy-conditions-tracking-neurons-over-hours
#13
Johannes Niediek, Jan Boström, Christian E Elger, Florian Mormann
Recording extracellulary from neurons in the brains of animals in vivo is among the most established experimental techniques in neuroscience, and has recently become feasible in humans. Many interesting scientific questions can be addressed only when extracellular recordings last several hours, and when individual neurons are tracked throughout the entire recording. Such questions regard, for example, neuronal mechanisms of learning and memory consolidation, and the generation of epileptic seizures. Several difficulties have so far limited the use of extracellular multi-hour recordings in neuroscience: Datasets become huge, and data are necessarily noisy in clinical recording environments...
2016: PloS One
https://www.readbyqxmd.com/read/27930298/light-affects-salt-stress-induced-transcriptional-memory-of-p5cs1-in-arabidopsis
#14
Xuan Jun Feng, Jing Rui Li, Shi Lian Qi, Qing Fang Lin, Jing Bo Jin, Xue Jun Hua
To cope with environmental stresses, plants often adopt a memory response upon primary stress exposure to facilitate a quicker and stronger reaction to recurring stresses. However, it remains unknown whether light is involved in the manifestation of stress memory. Proline accumulation is a striking metabolic adaptation of higher plants during various environmental stresses. Here we show that salinity-induced proline accumulation is memorable and HY5-dependent light signaling is required for such a memory response...
December 7, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27929345/directed-forgetting-of-memories-in-cocaine-users
#15
Manuel J Ruiz, Daniela Paolieri, Lorenza S Colzato, María Teresa Bajo
Memory retrieval requires an effective recruitment of inhibitory control to successfully reject unnecessary memories. The use of cocaine is associated with poor cognitive control processes, but little is known about the impact of chronic and recreational use of cocaine on inhibitory control during intentional forgetting. We studied whether chronic and recreational users of cocaine show impairments on the mechanism responsible for intentional forgetting of memories. Two experiments were carried out on chronic cocaine users in rehabilitation (Experiment 1) and recreational cocaine polydrug users (Experiment 2) performing a directed forgetting (DF) task, an index of memory suppression...
December 2016: Experimental and Clinical Psychopharmacology
https://www.readbyqxmd.com/read/27929339/cognitive-activity-mediates-the-association-between-social-activity-and-cognitive-performance-a-longitudinal-study
#16
Cassandra L Brown, Annie Robitaille, Elizabeth M Zelinski, Roger A Dixon, Scott M Hofer, Andrea M Piccinin
Social activity is 1 aspect of an active lifestyle and some evidence indicates it is related to preserved cognitive function in older adulthood. However, the potential mechanisms underlying this association remain unclear. We investigate 4 potential mediational pathways through which social activity may relate to cognitive performance. A multilevel structural equation modeling approach to mediation was used to investigate whether cognitive activity, physical activity, depressive symptoms, and vascular health conditions mediate the association between social activity and cognitive function in older adults...
December 2016: Psychology and Aging
https://www.readbyqxmd.com/read/27929327/the-development-of-automaticity-in-short-term-memory-search-item-response-learning-and-category-learning
#17
Rui Cao, Robert M Nosofsky, Richard M Shiffrin
In short-term-memory (STM)-search tasks, observers judge whether a test probe was present in a short list of study items. Here we investigated the long-term learning mechanisms that lead to the highly efficient STM-search performance observed under conditions of consistent-mapping (CM) training, in which targets and foils never switch roles across trials. In item-response learning, subjects learn long-term mappings between individual items and target versus foil responses. In category learning, subjects learn high-level codes corresponding to separate sets of items and learn to attach old versus new responses to these category codes...
December 8, 2016: Journal of Experimental Psychology. Learning, Memory, and Cognition
https://www.readbyqxmd.com/read/27929313/maternal-executive-functioning-as-a-mechanism-in-the-intergenerational-transmission-of-parenting-preliminary-evidence
#18
David J Bridgett, Meghan J Kanya, Helena J V Rutherford, Linda C Mayes
Multiple lines of inquiry, including experimental animal models, have recently converged to suggest that executive functioning (EF) may be one mechanism by which parenting behavior is transmitted across generations. In the current investigation, we empirically test this notion by examining relations between maternal EF and parenting behaviors during mother-infant interactions, and by examining the role of maternal EF in the intergenerational transmission of parenting behavior. Mother-infant dyads (N = 150) in a longitudinal study participated...
December 8, 2016: Journal of Family Psychology: JFP
https://www.readbyqxmd.com/read/27927958/coding-of-event-nodes-and-narrative-context-in-the-hippocampus
#19
Branka Milivojevic, Meryl Varadinov, Alejandro Vicente Grabovetsky, Silvy H P Collin, Christian F Doeller
: Narratives may provide a general context, unrestricted by space and time, which can be used to organize episodic memories into networks of related events. However, it is not clear how narrative contexts are represented in the brain. Here we test the novel hypothesis that the formation of narrative-based contextual representations in humans relies on the same hippocampal mechanisms that enable formation of spatiotemporal contexts in rodents. Participants watched a movie consisting of two interleaved narratives while we monitored their brain activity using fMRI...
December 7, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27926574/neural-activity-memory-and-dementias-serotonergic-markers
#20
Alfredo Meneses
Dysfunctional memory seems to be a key component of diverse dementias and other neuropsychiatric disorders; unfortunately, no effective treatment exists for this, probably because of the absence of neural biomarkers accompanying it. Diverse neurotransmission systems have been implicated in memory, including serotonin or 5-hydroxytryptamine (5-HT). There are multiple serotonergic pharmacological tools, well-characterized downstream signaling in mammals' species and neural markers providing new insights into memory functions and dysfunctions...
December 6, 2016: Behavioural Pharmacology
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