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https://www.readbyqxmd.com/read/28215000/angiotensin-ii-receptor-blockers-attenuate-lipopolysaccharide-induced-memory-impairment-by-modulation-of-nf-%C3%AE%C2%BAb-mediated-bdnf-creb-expression-and-apoptosis-in-spontaneously-hypertensive-rats
#1
Ruby Goel, Shahnawaz Ali Bhat, Kashif Hanif, Chandishwar Nath, Rakesh Shukla
Clinical studies demonstrated a positive correlation between hypertension and cognitive decline. Beneficial effects of angiotensin II receptor blockers on cognitive functions have also been reported earlier; however, its role in chronic neuroinflammation-induced memory impairment in the hypertensive state is not well understood. Therefore, in the present study, we investigated the effect of angiotensin II receptor blockers on memory impairment induced by lipopolysaccharide (LPS) in spontaneously hypertensive rats (SHRs)...
February 18, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28214838/the-role-of-hippocampal-structural-synaptic-plasticity-in-repetitive-transcranial-magnetic-stimulation-to-improve-cognitive-function-in-male-samp8-mice
#2
Jiang Ma, Jinhua Wang, Chaonan Lv, Jingjuan Pang, Bing Han, Mingwei Wang, Yuan Gen
BACKGROUND: Repetitive transcranial magnetic stimulation (rTMS) has been used to improve cognitive function, but the stimulation protocols are variable and the underlying mechanism is unclear. Therefore, we intend to examine whether 5Hz rTMS with 30% maximum output could improve cognitive functions in senescence-accelerated-prone mouse 8 (SAMP8) through changing synaptic plasticity. METHODS: SAMP8 and senescence-accelerated-prone mouse/resistant 1 (SAMR1) (7-month old male) were randomly divided into 3 groups: SMAP8 rTMS group (P8-rTMS), SMAP8 sham-rTMS group (P8-sham), and SAMR1 sham-rTMS group (R1-sham)...
January 18, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28214577/parafascicular-thalamic-nucleus-deep-brain-stimulation-decreases-nmda-receptor-glun1-subunit-gene-expression-in-the-prefrontal-cortex
#3
Mónica R Fernández-Cabrera, Abraham Selvas, Miguel Miguéns, Alejandro Higuera-Matas, Anna Vale-Martínez, Emilio Ambrosio, Margarita Martí-Nicolovius, Gemma Guillazo-Blanch
The rodent parafascicular nucleus (PFn) or the centromedian-parafascicular complex of primates is a posterior intralaminar nucleus of the thalamus related to cortical activation and maintenance of states of consciousness underlying attention, learning and memory. Deep brain stimulation (DBS) of the PFn has been proved to restore arousal and consciousness in humans and to enhance performance in learning and memory tasks in rats. The primary expected effect of PFn DBS is to induce plastic changes in target neurons of brain areas associated with cognitive function...
February 15, 2017: Neuroscience
https://www.readbyqxmd.com/read/28214576/amplified-induced-neural-oscillatory-activity-predicts-musicians-benefits-in-categorical-speech-perception
#4
Gavin M Bidelman
Event-related brain potentials (ERPs) reveal musical experience refines neural encoding and confers stronger categorical perception (CP) and neural organization for speech sounds. In addition to evoked brain activity, the human EEG can be decomposed into induced (non-phase-locked) response whose various frequency bands reflect different mechanisms of perceptual-cognitive processing. Here, we aimed to clarify which spectral properties of these neural oscillations are most prone to music-related neuroplasticity and which are linked to behavioral benefits in the categorization of speech...
February 15, 2017: Neuroscience
https://www.readbyqxmd.com/read/28213929/exploration-of-the-brn4-regulated-genes-enhancing-adult-hippocampal-neurogenesis-by-rna-sequencing
#5
Jingjing Guo, Xiang Cheng, Lei Zhang, Linmei Wang, Yongxin Mao, Guixiang Tian, Wenhao Xu, Yuhao Wu, Zhi Ma, Jianbing Qin, Meiling Tian, Guohua Jin, Wei Shi, Xinhua Zhang
Adult hippocampal neurogenesis is essential for learning and memory, and its dysfunction is involved in neurodegenerative diseases. However, the molecular mechanisms underlying adult hippocampal neurogenesis are still largely unknown. Our previous studies indicated that the transcription factor Brn4 was upregulated and promoted neuronal differentiation of neural stem cells (NSCs) in the surgically denervated hippocampus in rats. In this study, we use high-throughput RNA sequencing to explore the molecular mechanisms underlying the enhancement of adult hippocampal neurogenesis induced by lentivirus-mediated Brn4 overexpression in vivo...
February 18, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/28213830/recognition-memory-for-low-and-high-frequency-filtered-emotional-faces-low-spatial-frequencies-drive-emotional-memory-enhancement-whereas-high-spatial-frequencies-drive-the-emotion-induced-recognition-bias
#6
Michaela Rohr, Johannes Tröger, Nils Michely, Alarith Uhde, Dirk Wentura
This article deals with two well-documented phenomena regarding emotional stimuli: emotional memory enhancement-that is, better long-term memory for emotional than for neutral stimuli-and the emotion-induced recognition bias-that is, a more liberal response criterion for emotional than for neutral stimuli. Studies on visual emotion perception and attention suggest that emotion-related processes can be modulated by means of spatial-frequency filtering of the presented emotional stimuli. Specifically, low spatial frequencies are assumed to play a primary role for the influence of emotion on attention and judgment...
February 17, 2017: Memory & Cognition
https://www.readbyqxmd.com/read/28213512/27-hydroxycholesterol-impairs-neuronal-glucose-uptake-through-an-irap-glut4-system-dysregulation
#7
Muhammad-Al-Mustafa Ismail, Laura Mateos, Silvia Maioli, Paula Merino-Serrais, Zeina Ali, Maria Lodeiro, Eric Westman, Eran Leitersdorf, Balázs Gulyás, Lars Olof-Wahlund, Bengt Winblad, Irina Savitcheva, Ingemar Björkhem, Angel Cedazo-Mínguez
Hypercholesterolemia is associated with cognitively deteriorated states. Here, we show that excess 27-hydroxycholesterol (27-OH), a cholesterol metabolite passing from the circulation into the brain, reduced in vivo brain glucose uptake, GLUT4 expression, and spatial memory. Furthermore, patients exhibiting higher 27-OH levels had reduced (18)F-fluorodeoxyglucose uptake. This interplay between 27-OH and glucose uptake revealed the engagement of the insulin-regulated aminopeptidase (IRAP). 27-OH increased the levels and activity of IRAP, countered the IRAP antagonist angiotensin IV (AngIV)-mediated glucose uptake, and enhanced the levels of the AngIV-degrading enzyme aminopeptidase N (AP-N)...
February 17, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28213109/screening-of-plants-used-in-the-european-traditional-medicine-to-treat-memory-disorders-for-acetylcholinesterase-inhibitory-activity-and-anti-amyloidogenic-activity
#8
Eva S Lobbens, Karina J Vissing, Lene Jorgensen, Marco van de Weert, Anna K Jäger
ETHNOPHARMACOLOGICAL RELEVANCE: Plants used in the traditional medicine of Europe to treat memory dysfunction and/or to enhance memory were investigated for activity against the underlying mechanisms of Alzheimer's disease. AIM OF THE STUDY: To investigate 35 ethanolic extracts of plants, selected using an ethnopharmacological approach, for anti-amyloidogenic activity as well as an ability to inhibit the enzymatic activity of acetylcholinesterase. MATERIALS AND METHODS: The anti-amyloidogenic activity of the extracts against amyloid beta was investigated by Thioflavin T fibrillation assays and the ability to inhibit the enzymatic activity of acetylcholinesterase was evaluated monitoring the hydrolysis of acetylthiocholine RESULTS: Under the experimental conditions investigated, extracts of two plants, Carum carvi and Olea sylvestris, inhibited amyloid beta fibrillation considerably, eight plant extracts inhibited amyloid beta fibrillation to some extent, 16 plant extracts had no effect on amyloid beta fibrillation and nine extracts accelerated fibrillation of amyloid beta...
February 14, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28213063/impaired-spatial-performance-in-cerebellar-deficient-lurcher-mice-is-not-associated-with-their-abnormal-stress-response
#9
Jan Tuma, Yaroslav Kolinko, Dana Jelinkova, Pascal Hilber, Jan Cendelin
Both humans and laboratory animals suffering from cerebellar lesions exhibit cognitive as well as many emotional and behavioral abnormalities. These latter have been already observed in the cerebellar mutant mice currently used to highlight some aspect of autism spectrum disorders. The aim of this study was to investigate the influence of cerebellar-related stress response abnormalities on spatial learning and memory. Cerebellar-deficient Lurcher mutant mice were exposed to water environment without active escape possibility and then tested for spatial learning in the Morris water maze...
February 14, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28211489/sleep-supports-the-slow-abstraction-of-gist-from-visual-perceptual-memories
#10
Nicolas D Lutz, Susanne Diekelmann, Patricia Hinse-Stern, Jan Born, Karsten Rauss
Sleep benefits the consolidation of individual episodic memories. In the long run, however, it may be more efficient to retain the abstract gist of single, related memories, which can be generalized to similar instances in the future. While episodic memory is enhanced after one night of sleep, effective gist abstraction is thought to require multiple nights. We tested this hypothesis using a visual Deese-Roediger-McDermott paradigm, examining gist abstraction and episodic-like memory consolidation after 20 min, after 10 hours, as well as after one year of retention...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28210930/emotion-specific-nocebo-effects-an-fmri-study
#11
Anne Schienle, Carina Höfler, Sonja Übel, Albert Wabnegger
The neurobiological mechanisms of nocebos are still poorly understood. Thirty-eight women participated in a 'smell study' using functional magnetic resonance imaging. They were presented with an odorless stimulus (distilled water) together with the verbal suggestion that this fluid has an aversive odor which enhances disgust feelings. The nocebo was presented while the participants viewed disgusting, fear-inducing, and neutral images. Participants' affective and neuronal responses during nocebo administration were compared with those in a control condition without nocebo...
February 16, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28210189/development-of-a-meso-scale-sma-based-torsion-actuator-for-image-guided-procedures
#12
Jun Sheng, Dheeraj Gandhi, Rao Gullapalli, J Marc Simard, Jaydev P Desai
This paper presents the design, modeling, and control of a meso-scale torsion actuator based on shape memory alloy (SMA) for image-guided surgical procedures. Developing a miniature torsion actuator is challenging, but it opens the possibility of significantly enhancing the robot agility and maneuverability. The proposed torsion actuator is bi-directionally actuated by a pair of antagonistic SMA torsion springs through alternate Joule heating and natural cooling. The torsion actuator is integrated into a surgical robot prototype to demonstrate its working performance in the humid environment under C-Arm CT image guidance...
February 2017: IEEE Transactions on Robotics: a Publication of the IEEE Robotics and Automation Society
https://www.readbyqxmd.com/read/28209735/the-epac-phospholipase-c%C3%AE%C2%B5-pathway-regulates-endocannabinoid-signaling-and-cocaine-induced-disinhibition-of-vta-dopamine-neurons
#13
Jiaqing Tong, Xiaojie Liu, Casey Vickstrom, Yan Li, Laikang Yu, Youming Lu, Alan V Smrcka, Qing-Song Liu
Exchange protein directly activated by cAMP (Epac) is a direct effector for the ubiquitous second messenger cAMP. Epac activates the phospholipase Cε (PLCε) pathway. PLCβ has been linked to the synthesis of the endocannabinoid 2-arachidonoylglycerol (2-AG). Here, we report that Epac facilitates endocannabinoid-mediated retrograde synaptic depression through activation of PLCε. Intracellular loading of a selective Epac agonist 8-CPT-2Me-cAMP into ventral tegmental area (VTA) dopamine neurons enabled previously ineffective stimuli to induce depolarization-induced suppression of inhibition (DSI) and long-term depression of IPSCs (I-LTD) in the VTA...
February 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28208711/antidepressant-effects-of-aripiprazole-augmentation-for-cilostazol-treated-mice-exposed-to-chronic-mild-stress-after-ischemic-stroke
#14
Yu Ri Kim, Ha Neui Kim, Ki Whan Hong, Hwa Kyoung Shin, Byung Tae Choi
The aim of this study was to determine the effects and underlying mechanism of aripiprazole (APZ) augmentation for cilostazol (CLS)-treated post-ischemic stroke mice that were exposed to chronic mild stress (CMS). Compared to treatment with either APZ or CLS alone, the combined treatment resulted in a greater reduction in depressive behaviors, including anhedonia, despair-like behaviors, and memory impairments. This treatment also significantly reduced atrophic changes in the striatum, cortex, and midbrain of CMS-treated ischemic mice, and inhibited neuronal cell apoptosis, particularly in the striatum and the dentate gyrus of the hippocampus...
February 8, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28208341/effect-of-similarity-between-patterns-in-associative-memory
#15
Sheng-Jun Wang, Zhou Yang
We study the stability of patterns in Hopfield networks in which a part of memorized patterns are similar. The similarity between patterns impacts the stability of these patterns, but the stability of other independent patterns is only changed slightly. We show that the stability of patterns is affected in different ways by similarity. For networks storing a number of patterns, the similarity between patterns enhances the pattern stability. However, the stability of patterns can be weakened by the similarity when networks store fewer patterns, and the relation between the stability of patterns and similarity is nonmonotonic...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208289/atmospheric-pressure-vaporization-mechanism-for-coupling-a-liquid-phase-with-electron-ionization-mass-spectrometry
#16
Veronica Termopoli, Giorgio Famiglini, Pierangela Palma, Maurizio Piergiovanni, Achille Cappiello
A novel liquid chromatography-mass spectrometry (LC-MS) interfacing concept is presented and discussed. The new interface, called liquid-EI (LEI), is based on electron ionization (EI) but, differently from any previous attempt, the vaporization of solutes and mobile phase takes place at atmospheric pressure into a specifically designed region, called "vaporization microchannel", before entering the high-vacuum ion source. The interface is completely independent from the rest of the instrumentation and can be adapted to any gas chromatography/mass spectrometry (GC/MS) system, as an add-on for a rapid LC-MS conversion...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208078/the-characteristic-of-cognitive-dysfunction-in-remitted-late-life-depression-and-amnestic-mild-cognitive-impairment
#17
Wenxiang Liao, Xiangrong Zhang, Hao Shu, Zan Wang, Duan Liu, ZhiJun Zhang
Remitted late life depression exhibits persistent cognitive impairments and enhances the risk of dementia. This study aimed to examine the characteristics of cognitive dysfunction in remitted late life depression and amnestic mild cognitive impairment (MCI). Remitted late life depression (n=61), amnestic MCI (n=61) and age-education-matched controls (n=65) were evaluated with a battery of neuropsychological tests grouped into executive function, memory, processing speed, attention and visuospatial domains. Compared with control subjects, amnestic MCI individuals showed more severe cognitive impairments in all domains, while remitted late life depression individuals performed worse in executive function and memory...
January 12, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28207852/tetraspanin-6-a-novel-regulator-of-hippocampal-synaptic-transmission-and-long-term-plasticity
#18
Isabel H Salas, Zsuzsanna Callaerts-Vegh, Amaia M Arranz, Francesc X Guix, Rudi D'Hooge, José A Esteban, Bart De Strooper, Carlos G Dotti
Tetraspanins (Tspan) are transmembrane proteins with important scaffold and signalling functions. Deletions of Tetraspanin 6 (Tspan6) gene, a member of the tetraspanin family, have been reported in patients with Epilepsy Female-restricted with Mental Retardation (EFMR). Interestingly, mutations in Tspan7, highly homologous to Tspan6, are associated with X-linked intellectual disability, suggesting that these two proteins are important for cognition. Considering recent evidences showing that Tspan7 plays a key role in synapse development and AMPAR trafficking, we initiated the study of Tspan6 in synaptic function using a Tspan6 knock out mouse model...
2017: PloS One
https://www.readbyqxmd.com/read/28207407/deep-pain-exploiting-long-short-term-memory-networks-for-facial-expression-classification
#19
Pau Rodriguez, Guillem Cucurull, Jordi Gonalez, Josep M Gonfaus, Kamal Nasrollahi, Thomas B Moeslund, F Xavier Roca
Pain is an unpleasant feeling that has been shown to be an important factor for the recovery of patients. Since this is costly in human resources and difficult to do objectively, there is the need for automatic systems to measure it. In this paper, contrary to current state-of-the-art techniques in pain assessment, which are based on facial features only, we suggest that the performance can be enhanced by feeding the raw frames to deep learning models, outperforming the latest state-of-the-art results while also directly facing the problem of imbalanced data...
February 9, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28205605/the-role-of-the-rna-demethylase-fto-fat-mass-and-obesity-associated-and-mrna-methylation-in-hippocampal-memory-formation
#20
Brandon J Walters, Valentina Mercaldo, Colleen J Gillon, Matthew Yip, Rachael L Neve, Frederick M Boyce, Paul W Frankland, Sheena A Josselyn
The formation of long-lasting memories requires coordinated changes in gene expression and protein synthesis (Davis and Squire, 1984; Duvarci et al, 2008; Hernandez and Abel, 2008). Although many studies implicate DNA modifications (DNA methylation, histone modifications) in memory formation, the contributions of RNA modifications remain largely unexplored. Here, we investigated the role of mRNA methylation in hippocampal-dependent memory formation in mice. RNA modifications are highly dynamic and readily reversible (Jia et al, 2013)...
February 16, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
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