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https://www.readbyqxmd.com/read/28650994/abnormal-global-functional-network-connectivity-and-its-relationship-to-medial-temporal-atrophy-in-patients-with-amnestic-mild-cognitive-impairment
#1
Can Sheng, Mingrui Xia, Haikuo Yu, Yue Huang, Yan Lu, Fang Liu, Yong He, Ying Han
BACKGROUND: Amnestic mild cognitive impairment (aMCI), which is recently considered as a high risk status for developing Alzheimer's disease (AD), manifests with gray matter atrophy and increased focal functional activity in the medial temporal lobe (MTL). However, the abnormalities of whole-brain functional network connectivity in aMCI and its relationship to medial temporal atrophy (MTA) remain unknown. METHODS: In this study, thirty-six aMCI patients and thirty-five healthy controls (HCs) were recruited...
2017: PloS One
https://www.readbyqxmd.com/read/28650477/video-rate-volumetric-ca-2-imaging-across-cortex-using-seeded-iterative-demixing-sid-microscopy
#2
Tobias Nöbauer, Oliver Skocek, Alejandro J Pernía-Andrade, Lukas Weilguny, Francisca Martínez Traub, Maxim I Molodtsov, Alipasha Vaziri
Light-field microscopy (LFM) is a scalable approach for volumetric Ca(2+) imaging with high volumetric acquisition rates (up to 100 Hz). Although the technology has enabled whole-brain Ca(2+) imaging in semi-transparent specimens, tissue scattering has limited its application in the rodent brain. We introduce seeded iterative demixing (SID), a computational source-extraction technique that extends LFM to the mammalian cortex. SID can capture neuronal dynamics in vivo within a volume of 900 × 900 × 260 μm located as deep as 380 μm in the mouse cortex or hippocampus at a 30-Hz volume rate while discriminating signals from neurons as close as 20 μm apart, at a computational cost three orders of magnitude less than that of frame-by-frame image reconstruction...
June 26, 2017: Nature Methods
https://www.readbyqxmd.com/read/28649673/rapid-acting-antidepressants-in-chronic-stress-models-molecular-and-cellular-mechanisms
#3
Brendan D Hare, Sriparna Ghosal, Ronald S Duman
Stress-associated disorders, including depression and anxiety, impact nearly 20% of individuals in the United States. The social, health, and economic burden imposed by stress-associated disorders requires in depth research efforts to identify suitable treatment strategies. Traditional medications (e.g., selective serotonin reuptake inhibitors, monoamine oxidase inhibitors) have significant limitations, notably a time lag for therapeutic response that is compounded by low rates of efficacy. Excitement over ketamine, a rapid acting antidepressant effective in treatment resistant patients, is tempered by transient dissociative and psychotomimetic effects, as well as abuse potential...
February 2017: Chronic stress
https://www.readbyqxmd.com/read/28649200/cognitive-variability-during-middle-age-possible-association-with-neurodegeneration-and-cognitive-reserve
#4
Daniel Ferreira, Alejandra Machado, Yaiza Molina, Antonieta Nieto, Rut Correia, Eric Westman, José Barroso
Objective: Increased variability in cognition with age has been argued as an indication of pathological processes. Focusing on early detection of neurodegenerative disorders, we investigated variability in cognition in healthy middle-aged adults. In order to understand possible determinants of this variability, we also investigated associations with cognitive reserve, neuroimaging markers, subjective memory complaints, depressive symptomatology, and gender. Method: Thirty-one 50 ± 2 years old individuals were investigated as target group and deviation was studied in comparison to a reference younger group of 30 individuals 40 ± 2 years old...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28649199/glyx-13-a-nmda-receptor-glycine-site-functional-partial-agonist-attenuates-cerebral-ischemia-injury-in-vivo-and-vitro-by-differential-modulations-of-nmda-receptors-subunit-components-at-different-post-ischemia-stage-in-mice
#5
Chen Zheng, Zhi H Qiao, Meng Z Hou, Nan N Liu, Bin Fu, Ran Ding, Yuan Y Li, Liang P Wei, Ai L Liu, Hui Shen
Excessive activation of NMDA receptors (NMDARs) is implicated in pathological synaptic plasticity also known as post-ischemic long-term potentiation (i-LTP) which was produced by glutamate mediated excitotoxicity after stroke. In the past decades, many NMDARs inhibitors failed in clinical investigations due to severe psychotomimetic side effects. GLYX-13 is a NMDAR modulator with glycine site partial agonist properties and has potential protective effects on ischemic neuronal death. However, the underlying molecular mechanism of GLYX-13 attenuating the ischemic neuronal damage remains elusive...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28648815/age-dependent-changes-in-autophosphorylation-of-alpha-calcium-calmodulin-dependent-kinase-ii-in-hippocampus-and-amygdala-after-contextual-fear-conditioning
#6
Ton Fang, Kamillia Kasbi, Stephanie Rothe, Wajeeha Aziz, K Peter Giese
The hippocampus and amygdala are essential brain regions responsible for contextual fear conditioning (CFC). The autophosphorylation of alpha calcium-calmodulin kinase II (αCaMKII) at threonine-286 (T286) is a critical step implicated in long-term potentiation (LTP), learning and memory. However, the changes in αCaMKII levels with aging and training in associated brain regions are not fully understood. Here, we studied how aging and training affect the levels of phosphorylated (T286) and proportion of phosphorylated:total αCaMKII in the hippocampus and amygdala...
June 22, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28648684/hbk-15-protects-mice-from-stress-induced-behavioral-disturbances-and-changes-in-corticosterone-bdnf-and-ngf-levels
#7
Karolina Pytka, Monika Głuch-Lutwin, Magdalena Kotańska, Elżbieta Żmudzka, Magdalena Jakubczyk, Anna Waszkielewicz, Paulina Janiszewska, Maria Walczak
Unlike majority of current antidepressants, HBK-15-a 5-HT1A and 5-HT7 receptor antagonist - showed memory-enhancing properties. In this study, we aimed to further characterize pharmacological profile of HBK-15 and investigate its antidepressant- and anxiolytic-like activity in the mouse model of unpredictable chronic mild stress. We used sucrose consumption test, forced swim test and elevated plus maze and evaluated the influence on brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) levels in the hippocampus and prefrontal cortex, as well as body weight, relative adrenal glands weight and plasma corticosterone level in the stressed mice...
June 22, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28648568/application-of-machine-learning-classification-for-structural-brain-mri-in-mood-disorders-critical-review-from-a-clinical-perspective
#8
REVIEW
Yong-Ku Kim, Kyoung-Sae Na
Mood disorders are a highly prevalent group of mental disorders causing substantial socioeconomic burden. There are various methodological approaches for identifying the underlying mechanisms of the etiology, symptomatology, and therapeutics of mood disorders; however, neuroimaging studies have provided the most direct evidence for mood disorder neural substrates by visualizing the brains of living individuals. The prefrontal cortex, hippocampus, amygdala, thalamus, ventral striatum, and corpus callosum are associated with depression and bipolar disorder...
June 22, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28648549/hippocampal-spatial-mechanisms-relate-to-the-development-of-arithmetic-symbol-processing-in-children
#9
Romain Mathieu, Justine Epinat-Duclos, Jessica Léone, Michel Fayol, Catherine Thevenot, Jérôme Prado
Understanding the meaning of abstract mathematical symbols is a cornerstone of arithmetic learning in children. Studies have long focused on the role of spatial intuitions in the processing of numerals. However, it has been argued that such intuitions may also underlie symbols that convey fundamental arithmetic concepts, such as arithmetic operators. In the present cross-sectional study, we used fMRI to investigate how and when associations between arithmetic operators and brain regions processing spatial information emerge in children from 3(rd) to 10(th) grade...
June 13, 2017: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/28648389/stress-primes-microglial-polarization-after-global-ischemia-therapeutic-potential-of-progesterone
#10
Claudia Espinosa-Garcia, Iqbal Sayeed, Seema Yousuf, Fahim Atif, Elena G Sergeeva, Gretchen N Neigh, Donald G Stein
Despite the fact stress is associated with increased risk of stroke and worsened outcome, most preclinical studies have ignored this comorbid factor, especially in the context of testing neuroprotective treatments. Preclinical research suggests that stress primes microglia, resulting in an enhanced reactivity to a subsequent insult and potentially increasing vulnerability to stroke. Ischemia-induced activated microglia can be polarized into a harmful phenotype, M1, which produces pro-inflammatory cytokines, or a protective phenotype, M2, which releases anti-inflammatory cytokines and neurotrophic factors...
June 22, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28648093/s-nitrosylation-of-ras-mediates-nitric-oxide-dependent-post-injury-neurogenesis-in-a-seizure-model
#11
Ana Isabel Santos, Bruno Pereira Carreira, Alicia Izquierdo-Álvarez, Elena Ramos, Ana Sofia Lourenço, Daniela Santos, Maria Inês Morte, Luís Filipe Ribeiro, Ana Marreiros, Nuria Sánchez-López, Anabel Marina, Caetana Monteiro Carvalho, Antonio Martínez-Ruiz, Inês M Araújo
AIMS: Nitric oxide (NO) is involved in the upregulation of endogenous neurogenesis in the subventricular zone and in the hippocampus after injury. One of the main neurogenic pathways activated by NO is the ERK/MAPK pathway, downstream of the EGF receptor. However, the mechanism by which NO stimulates cell proliferation through activation of the ERK/MAPK pathway remains unknown, although p21Ras seems to be one of the earliest targets of NO. Here, we aimed to study the possible neurogenic action of NO by post-translational modification of p21Ras as a relevant target for early neurogenic events promoted by NO in neural stem cells (NSC)...
June 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28647595/intermittent-hypoxia-caused-cognitive-dysfunction-relate-to-mirnas-dysregulation-in-hippocampus
#12
Huabin Gao, Zhaoli Han, Shan Huang, Ruojing Bai, Xintong Ge, Fanglian Chen, Ping Lei
Intermittent hypoxia (IH) is a characteristic pathophysiological change of obstructive sleep apnea (OSA), a commonly diagnosed chronic sleep disorder. With the process of OSA, patients will suffer from the nervous system damage and appear to multiple cognitive dysfunction. The mechanism that how IH causes cognitive impairment is still unknown. Both control and experimental rats were placed in conditions absence and presence of intermittent hypoxia (IH) for 8h a day for a week, two weeks and four weeks, and then followed by behavioral assessments with Morris Water Maze (MWM) test...
June 21, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28647594/chronic-mild-stress-impairs-latent-inhibition-and-induces-region-specific-neural-activation-in-chl1-deficient-mice-a-mouse-model-of-schizophrenia
#13
Mona Buhusi, Daniel Obray, Bret Guercio, Mitchell J Bartlett, Catalin V Buhusi
Schizophrenia is a neurodevelopmental disorder characterized by abnormal processing of information and attentional deficits. Schizophrenia has a high genetic component but is precipitated by environmental factors, as proposed by the 'two-hit' theory of schizophrenia. Here we compared latent inhibition as a measure of learning and attention, in CHL1-deficient mice, an animal model of schizophrenia, and their wild-type littermates, under no-stress and chronic mild stress conditions. All unstressed mice as well as the stressed wild-type mice showed latent inhibition...
June 21, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28647555/normalizing-the-gene-dosage-of-dyrk1a-in-a-mouse-model-of-down-syndrome-rescues-several-alzheimer-s-disease-phenotypes
#14
Susana García-Cerro, Noemí Rueda, Verónica Vidal, Sara Lantigua, Carmen Martínez-Cué
The intellectual disability that characterizes Down syndrome (DS) is primarily caused by prenatal changes in central nervous system growth and differentiation. However, in later life stages, the cognitive abilities of DS individuals progressively decline due to accelerated aging and the development of Alzheimer's disease (AD) neuropathology. The AD neuropathology in DS has been related to the overexpression of several genes encoded by Hsa21 including DYRK1A (dual-specificity tyrosine-(Y)-phosphorylation regulated kinase 1A), which encodes a protein kinase that performs crucial functions in the regulation of multiple signaling pathways that contribute to normal brain development and adult brain physiology...
June 21, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28647536/crhr1-exacerbates-the-glial-inflammatory-response-and-alters-bdnf-trkb-pcreb-signaling-in-a-rat-model-of-global-cerebral-ischemia-implications-for-neuroprotection-and-cognitive-recovery
#15
Patricia B de la Tremblaye, Simon M Benoit, Sarah Schock, Hélène Plamondon
This study examined the impact of corticotropin-releasing hormone type 1 receptor (CRHR1) blockade using Antalarmin (ANT) on the expression of markers of neuroplasticity and inflammation, as well as neuroprotection and behavioral recovery following global cerebral ischemia. Male Wistar rats (N=50) were treated with ANT (2μg/2μl; icv) or a vehicle solution prior to a sham or four vessel (4VO) occlusion. Seven days post ischemia, anxiety was assessed in the Elevated Plus Maze and Open Field tests, and fear and spatial learning in a Y-Maze Passive Avoidance Task and the Barnes Maze...
June 21, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28647411/hippocampal-5-ht1a-receptor-expression-changes-in-prodromal-stages-of-alzheimer-s-disease-beneficial-or-deleterious
#16
REVIEW
M Verdurand, L Zimmer
There is increasing evidence that the serotonergic system is highly dysfunctional in Alzheimer's disease (AD), and this could be related to cognitive impairments associated with dementia. Of the various serotonin receptors, 5-HT1A receptors are relevant to AD as they are highly expressed in the human hippocampus and are known to be involved in the regulation of memory processes. This review will discuss the involvement of 5-HT1A receptors in AD at several levels (post-mortem, in-vivo imaging, animal models)...
June 21, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28647011/brain-structural-signatures-of-adolescent-depressive-symptom-trajectories-a-longitudinal-magnetic-resonance-imaging-study
#17
Lianne Schmaal, Murat Yücel, Rachel Ellis, Nandita Vijayakumar, Julian G Simmons, Nicholas B Allen, Sarah Whittle
OBJECTIVE: Most evidence for structural brain abnormalities associated with adolescent depression is based on cross-sectional study designs that do not take into account the dynamic course of depressive symptoms and brain maturation across adolescence. In this study, a longitudinal design was used to investigate the association between different trajectories of depressive symptoms and longitudinal changes in brain structure throughout adolescence. METHOD: One hundred forty-nine adolescents were assessed on depressive symptoms and underwent structural magnetic resonance imaging at 12 years of age and were followed up multiple times until 19 years...
July 2017: Journal of the American Academy of Child and Adolescent Psychiatry
https://www.readbyqxmd.com/read/28646910/the-role-of-5-ht-receptors-in-depression
#18
REVIEW
Christine N Yohn, Mark M Gergues, Benjamin Adam Samuels
Depression is a polygenic and highly complex psychiatric disorder that remains a major burden on society. Antidepressants, such as selective serotonin reuptake inhibitors (SSRIs), are some of the most commonly prescribed drugs worldwide. In this review, we will discuss the evidence that links serotonin and serotonin receptors to the etiology of depression and the mechanisms underlying response to antidepressant treatment. We will then revisit the role of serotonin in three distinct hypotheses that have been proposed over the last several decades to explain the pathophysiology of depression: the monoamine, neurotrophic, and neurogenic hypotheses...
June 24, 2017: Molecular Brain
https://www.readbyqxmd.com/read/28646687/cortical-amyloid-accumulation-is-associated-with-alterations-of-structural-integrity-in-older-people-with-subjective-memory-complaints
#19
Stefan J Teipel, Enrica Cavedo, Sarah Weschke, Michel J Grothe, Katrine Rojkova, Gaëlle Fontaine, Luce Dauphinot, Gabriel Gonzalez-Escamilla, Marie-Claude Potier, Hugo Bertin, Marie-Odile Habert, Bruno Dubois, Harald Hampel
We determined the effect of cortical amyloid load using (18)F-florbetapir PET on cognitive performance and gray matter structural integrity derived from MRI in 318 cognitively normally performing older people with subjective memory impairment from the INSIGHT-preAD cohort using multivariate partial least squares regression. Amyloid uptake was associated with reduced gray matter structural integrity in hippocampus, entorhinal and cingulate cortex, middle temporal gyrus, prefrontal cortex, and lentiform nucleus (p < 0...
May 31, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28646469/the-cathinones-mdpv-and-%C3%AE-pvp-elicit-different-behavioral-and-molecular-effects-following-acute-exposure
#20
Giuseppe Giannotti, Isabella Canazza, Lucia Caffino, Sabrine Bilel, Andrea Ossato, Fabio Fumagalli, Matteo Marti
Since the mid-to-late 2000s, synthetic cathinones have gained popularity among drug users due to their psychostimulant effects greater than those produced by cocaine and amphetamine. Among them, 3,4-methylenedioxypyrovalerone (MDPV) and 1-phenyl-2-(pyrrolidin-1-yl)pentan-1-one (α-PVP) are ones of the most popular cathinones available in the clandestine market as "bath salts" or "fertilizers." Pre-clinical studies indicate that MDPV and α-PVP induced psychomotor stimulation, affected thermoregulation, and promoted reinforcing properties in rodents...
June 23, 2017: Neurotoxicity Research
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