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https://www.readbyqxmd.com/read/28431369/the-temporal-paradox-of-hebbian-learning-and-homeostatic-plasticity
#1
REVIEW
Friedemann Zenke, Wulfram Gerstner, Surya Ganguli
Hebbian plasticity, a synaptic mechanism which detects and amplifies co-activity between neurons, is considered a key ingredient underlying learning and memory in the brain. However, Hebbian plasticity alone is unstable, leading to runaway neuronal activity, and therefore requires stabilization by additional compensatory processes. Traditionally, a diversity of homeostatic plasticity phenomena found in neural circuits is thought to play this role. However, recent modelling work suggests that the slow evolution of homeostatic plasticity, as observed in experiments, is insufficient to prevent instabilities originating from Hebbian plasticity...
April 18, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28431288/longitudinal-whole-brain-atrophy-and-ventricular-enlargement-in-nondemented-parkinson-s-disease
#2
Elijah Mak, Li Su, Guy B Williams, Michael J Firbank, Rachael A Lawson, Alison J Yarnall, Gordon W Duncan, Brit Mollenhauer, Adrian M Owen, Tien K Khoo, David J Brooks, James B Rowe, Roger A Barker, David J Burn, John T O'Brien
We investigated whole-brain atrophy and ventricular enlargement over 18 months in nondemented Parkinson's disease (PD) and examined their associations with clinical measures and baseline CSF markers. PD subjects (n = 100) were classified at baseline into those with mild cognitive impairment (MCI; PD-MCI, n = 36) and no cognitive impairment (PD-NC, n = 64). Percentage of whole-brain volume change (PBVC) and ventricular expansion over 18 months were assessed with FSL-SIENA and ventricular enlargement (VIENA) respectively...
March 16, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28422894/impact-of-telephone-based-problem-solving-treatment-on-the-use-of-medical-and-psychological-services-in-the-military
#3
John S Richardson, Jesse R Fann, Kathleen R Bell, Nancy Temkin
OBJECTIVE: To explore the impact of problem-solving treatment (PST) for mild traumatic brain injury in active duty service members on the use of medical and psychological services. PARTICIPANTS: Service members who had a mild traumatic brain injury during their last deployment and enrolled in the CONcussion Treatment After Combat Trauma (CONTACT) study. DESIGN: Secondary analysis of a randomized clinical trial. Participants were assigned to telephone-based PST, or e-mailed or mailed education only over the course of 6 months...
April 18, 2017: Journal of Head Trauma Rehabilitation
https://www.readbyqxmd.com/read/28416460/regional-distribution-of-cholinergic-catecholaminergic-serotonergic-and-orexinergic-neurons-in-the-brain-of-two-carnivore-species-the-feliform-banded-mongoose-mungos-mungo-and-the-caniform-domestic-ferret-mustela-putorius-furo
#4
Sashrika Pillay, Adhil Bhagwandin, Mads F Bertelsen, Nina Patzke, Gerhard Engler, Andreas K Engel, Paul R Manger
The nuclear organization of the cholinergic, catecholaminergic, serotonergic and orexinergic neurons in the brains of two species of carnivore, the banded mongoose (Mungos mungo) and domestic ferret (Mustela putorius furo), is presented. The banded mongoose belongs to the feliform suborder and the domestic ferret to the caniform suborder, having last shared a common ancestor approximately 53 million years ago; however, they have a very similar overall morphology and life history, presenting an interesting opportunity to examine the extent of evolutionary plasticity in these systems...
April 14, 2017: Journal of Chemical Neuroanatomy
https://www.readbyqxmd.com/read/28416018/detection-of-histone-h3-mutations-in-cerebrospinal-fluid-derived-tumor-dna-from-children-with-diffuse-midline-glioma
#5
Tina Y Huang, Andrea Piunti, Rishi R Lulla, Jin Qi, Craig M Horbinski, Tadanori Tomita, C David James, Ali Shilatifard, Amanda M Saratsis
Diffuse midline gliomas (including diffuse intrinsic pontine glioma, DIPG) are highly morbid glial neoplasms of the thalamus or brainstem that typically arise in young children and are not surgically resectable. These tumors are characterized by a high rate of histone H3 mutation, resulting in replacement of lysine 27 with methionine (K27M) in genes encoding H3 variants H3.3 (H3F3A) and H3.1 (HIST1H3B). Detection of these gain-of-function mutations has clinical utility, as they are associated with distinct tumor biology and clinical outcomes...
April 17, 2017: Acta Neuropathologica Communications
https://www.readbyqxmd.com/read/28415142/neural-correlates-of-cognitive-processing-in-monolinguals-and-bilinguals
#6
REVIEW
John G Grundy, John A E Anderson, Ellen Bialystok
Here, we review the neural correlates of cognitive control associated with bilingualism. We demonstrate that lifelong practice managing two languages orchestrates global changes to both the structure and function of the brain. Compared with monolinguals, bilinguals generally show greater gray matter volume, especially in perceptual/motor regions, greater white matter integrity, and greater functional connectivity between gray matter regions. These changes complement electroencephalography findings showing that bilinguals devote neural resources earlier than monolinguals...
April 17, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28409356/flair-to-visualize-veins-in-white-matter-lesions-a-new-tool-for-the-diagnosis-of-multiple-sclerosis
#7
T Campion, R J P Smith, D R Altmann, G C Brito, B P Turner, J Evanson, I C George, P Sati, D S Reich, M E Miquel, K Schmierer
OBJECTIVE: To explore the potential of a post-processing technique combining FLAIR and T2* (FLAIR*) to distinguish between lesions caused by multiple sclerosis (MS) from cerebral small vessel disease (SVD) in a clinical setting. METHODS: FLAIR and T2* head datasets acquired at 3T of 25 people with relapsing MS (pwRMS) and ten with pwSVD were used. After post-processing, FLAIR* maps were used to determine the proportion of white matter lesions (WML) showing the 'vein in lesion' sign (VIL), a characteristic histopathological feature of MS plaques...
April 13, 2017: European Radiology
https://www.readbyqxmd.com/read/28402705/interaction-of-factor-h-binding-protein-of-streptococcus-suis-with-globotriaosylceramide-promotes-the-development-of-meningitis
#8
Decong Kong, Zhe Chen, Junping Wang, Qingyu Lv, Hua Jiang, Yuling Zheng, Maokai Xu, Xuyu Zhou, Huaijie Hao, Yongqiang Jiang
Streptococcus suis is an important emerging zoonotic agent that causes acute bacterial meningitis in humans with high mortality and morbidity. Our previous work showed that factor H-binding protein (Fhb) contributed to virulence of S. suis, but the role of Fhb in the development of S. suis meningitis remained unclear. In this study, we demonstrated for the first time that Fhb contributed to the traversal of S. suis across the human blood-brain barrier by allelic-exchange mutagenesis, complementation and specific antibody blocking studies...
April 12, 2017: Virulence
https://www.readbyqxmd.com/read/28402228/complement-components-are-expressed-by-infiltrating-macrophages-activated-microglia-early-following-viral-infection
#9
Jane E Libbey, Matthew F Cusick, Daniel J Doty, Robert S Fujinami
The individual innate immune components, interleukin-6 and complement component C3, play a role in the development of acute seizures in the Theiler's murine encephalomyelitis virus-induced seizure model. We examined the mRNA expression of various other complement components, cytokines, chemokines, and major histocompatibility complex antigens both within brain and in isolated ramified microglial and infiltrating macrophage/activated microglial cell populations over a time course covering the first 3 days postinfection...
April 12, 2017: Viral Immunology
https://www.readbyqxmd.com/read/28397982/generation-of-chimeric-minipigs-by-aggregating-4-to-8-cell-stage-blastomeres-from-somatic-cell-nuclear-transfer-with-the-tracing-of-enhanced-green-fluorescent-protein
#10
Huili Ji, Chuan Long, Chong Feng, Ningning Shi, Yingdi Jiang, Guomin Zeng, Xirui Li, Jingjing Wu, Lin Lu, Shengsheng Lu, Dengke Pan
BACKGROUND: Blastocyst complementation is an important technique for generating chimeric organs in organ-deficient pigs, which holds great promise for solving the problem of a shortage of organs for human transplantation procedures. Porcine chimeras have been generated using embryonic germ cells, embryonic stem cells, and induced pluripotent stem cells; however, there are no authentic pluripotent stem cells for pigs. In previous studies, blastomeres from 4- to 8-cell-stage parthenogenetic embryos were able to generate chimeric fetuses efficiently, but the resulting fetuses did not produce live-born young...
April 11, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28392842/dna-methylation-signatures-for-2016-who-classification-subtypes-of-diffuse-gliomas
#11
Yashna Paul, Baisakhi Mondal, Vikas Patil, Kumaravel Somasundaram
BACKGROUND: Glioma is the most common of all primary brain tumors with poor prognosis and high mortality. The 2016 World Health Organization classification of the tumors of central nervous system uses molecular parameters in addition to histology to redefine many tumor entities. The new classification scheme divides diffuse gliomas into low-grade glioma (LGG) and glioblastoma (GBM) as per histology. LGGs are further divided into isocitrate dehydrogenase (IDH) wild type or mutant, which is further classified into either oligodendroglioma that harbors 1p/19q codeletion or diffuse astrocytoma that has an intact 1p/19q loci but enriched for ATRX loss and TP53 mutation...
2017: Clinical Epigenetics
https://www.readbyqxmd.com/read/28392482/adult-stem-cells-in-psychiatric-disorders-new-discoveries-in-peripheral-blood
#12
REVIEW
Jolanta Kucharska-Mazur, Marcin Jabłoński, Błażej Misiak, Dorota Frydecka, Janusz Rybakowski, Mariusz Z Ratajczak, Jerzy Samochowiec
The new area of research in psychiatric disorders is concerned with abnormal regeneration processes. The role of brain neurogenesis has been studied for decades. New discoveries, concerned with the pluripotency of VSEL cells and the role of factors involved in stem cell trafficking in peripheral blood create hope that it will be possible to develop a better understanding of the processes of neuroregeneration/neurodegeneration. There is an ongoing research investigating concentrations of: sphingosine -1-phosphate, SDF-1, elements of complement cascade, and stem cells in peripheral blood, including their possible connection to psychiatric disorders...
April 7, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28391987/cardiovascular-and-autonomic-reactivity-to-psychological-stress-neurophysiological-substrates-and-links-to-cardiovascular-disease
#13
REVIEW
Annie T Ginty, Thomas E Kraynak, James P Fisher, Peter J Gianaros
Psychologically stressful experiences evoke changes in cardiovascular physiology that may influence risk for cardiovascular disease (CVD). But what are the neural circuits and intermediate physiological pathways that link stressful experiences to cardiovascular changes that might in turn confer disease risk? This question is important because it has broader implications for our understanding of the neurophysiological pathways that link stressful and other psychological experiences to physical health. This review highlights selected findings from brain imaging studies of stressor-evoked cardiovascular reactivity and CVD risk...
March 16, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28386624/mutated-pet117-causes-complex-iv-deficiency-and-is-associated-with-neurodevelopmental-regression-and-medulla-oblongata-lesions
#14
G H Renkema, G Visser, F Baertling, L T Wintjes, V M Wolters, J van Montfrans, G A P de Kort, P G J Nikkels, P M van Hasselt, S N van der Crabben, R J T Rodenburg
The genetic basis of the many progressive, multi systemic, mitochondrial diseases that cause a lack of cellular ATP production is heterogeneous, with defects found both in the mitochondrial genome as well as in the nuclear genome. Many different mutations have been found in the genes encoding subunits of the enzyme complexes of the oxidative phosphorylation system. In addition, mutations in genes encoding proteins involved in the assembly of these complexes are known to cause mitochondrial disorders. Here we describe two sisters with a mitochondrial disease characterized by lesions in the medulla oblongata, as demonstrated by brain magnetic resonance imaging, and an isolated complex IV deficiency and reduced levels of individual complex IV subunits...
April 6, 2017: Human Genetics
https://www.readbyqxmd.com/read/28383788/replication-stress-dna-damage-signalling-and-cytomegalovirus-infection-in-human-medulloblastomas
#15
Jiri Bartek, Olesja Fornara, Joanna Maria Merchut-Maya, Apolinar Maya-Mendoza, Afshar Rahbar, Giuseppe Stragliotto, Helle Broholm, Mikael Svensson, Astrid Sehested, Cecilia Söderberg Naucler, Jiri Bartek, Jirina Bartkova
Medulloblastomas are the most common, and often fatal, paediatric brain tumours that feature high genomic instability, frequent infection by human cytomegalovirus (HCMV) and resistance to radiation and chemotherapy. The causes of the pronounced chromosomal instability and its potential links with HCMV infection and/or resistance to genotoxic therapies remain largely unknown. To address these issues, here we have combined immunohistochemical analysis of a series of 25 paediatric medulloblastomas, complemented by medulloblastoma cell culture models including experimental HCMV infection...
April 6, 2017: Molecular Oncology
https://www.readbyqxmd.com/read/28383046/systemic-administration-of-induced-neural-stem-cells-regulates-complement-activation-in-mouse-closed-head-injury-models
#16
Mou Gao, Qin Dong, Hui Yao, Yingzhou Lu, Xinchao Ji, Mingming Zou, Zhijun Yang, Minhui Xu, Ruxiang Xu
Complement activation plays important roles in the pathogenesis of central nervous system (CNS) diseases. Patients face neurological disorders due to the development of complement activation, which contributes to cell apoptosis, brain edema, blood-brain barrier dysfunction and inflammatory infiltration. We previously reported that induced neural stem cells (iNSCs) can promote neurological functional recovery in closed head injury (CHI) animals. Remarkably, we discovered that local iNSC grafts have the potential to modulate CNS inflammation post-CHI...
April 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28381303/retention-of-normal-glia-function-by-an-isoform-selective-protein-kinase-inhibitor-drug-candidate-that-modulates-cytokine-production-and-cognitive-outcomes
#17
Zhengqiu Zhou, Adam D Bachstetter, Claudia B Späni, Saktimayee M Roy, D Martin Watterson, Linda J Van Eldik
BACKGROUND: Brain p38α mitogen-activated protein kinase (MAPK), a potential therapeutic target for cognitive dysfunction based on the neuroinflammation-synaptic dysfunction cycle of pathophysiology progression, offers an innovative pharmacological strategy via inhibiting the same activated target in both glia and neurons, thereby enhancing the possibility for efficacy. The highly selective, brain-penetrant p38αMAPK inhibitor MW150 attenuates cognitive dysfunction in two distinct Alzheimer's disease (AD)-relevant models and avoids the problems encountered with previous mixed-kinase inhibitor drug candidates...
April 5, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28375719/predictive-processing-source-monitoring-and-psychosis
#18
Juliet D Griffin, Paul C Fletcher
A comprehensive understanding of psychosis requires models that link multiple levels of explanation: the neurobiological, the cognitive, the subjective, and the social. Until we can bridge several explanatory gaps, it is difficult to explain how neurobiological perturbations can manifest in bizarre beliefs or hallucinations, nor how trauma or social adversity can perturb lower-level brain processes. We propose that the predictive processing framework has much to offer in this respect.Weshow how this framework may underpin and complement source monitoring theories of delusions and hallucinations and how, when considered in terms of a dynamic and hierarchical system, it may provide a compelling model of several key clinical features of psychosis...
March 30, 2017: Annual Review of Clinical Psychology
https://www.readbyqxmd.com/read/28370825/assessing-cerebrovascular-reactivity-by-the-pattern-of-response-to-progressive-hypercapnia
#19
Joseph A Fisher, Olivia Sobczyk, Adrian Crawley, Julien Poublanc, Paul Dufort, Lashmi Venkatraghavan, Kevin Sam, David Mikulis, James Duffin
Cerebral blood flow responds to a carbon dioxide challenge, and is often assessed as cerebrovascular reactivity, assuming a linear response over a limited stimulus range or a sigmoidal response over a wider range. However, these assumed response patterns may not necessarily apply to regions with pathophysiology. Deviations from sigmoidal responses are hypothesised to result from upstream flow limitations causing competition for blood flow between downstream regions, particularly with vasodilatory stimulation; flow is preferentially distributed to regions with more reactive vessels...
April 3, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28367127/alterations-of-intrinsic-brain-connectivity-patterns-in-depression-and-bipolar-disorders-a-critical-assessment-of-magnetoencephalography-based-evidence
#20
REVIEW
Golnoush Alamian, Ana-Sofía Hincapié, Etienne Combrisson, Thomas Thiery, Véronique Martel, Dmitrii Althukov, Karim Jerbi
Despite being the object of a thriving field of clinical research, the investigation of intrinsic brain network alterations in psychiatric illnesses is still in its early days. Because the pathological alterations are predominantly probed using functional magnetic resonance imaging (fMRI), many questions about the electrophysiological bases of resting-state alterations in psychiatric disorders, particularly among mood disorder patients, remain unanswered. Alongside important research using electroencephalography (EEG), the specific recent contributions and future promise of magnetoencephalography (MEG) in this field are not fully recognized and valued...
2017: Frontiers in Psychiatry
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