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https://www.readbyqxmd.com/read/28938340/paediatric-traumatic-brain-injury-prognostic-insights-and-outlooks
#1
Alicia K Au, Robert S B Clark
PURPOSE OF REVIEW: Traumatic brain injury (TBI) is a leading cause of death and disability in children. Prognostication of outcome following TBI is challenging in this population and likely requires complex, multimodal models to achieve clinically relevant accuracy. This review highlights injury characteristics, physiological indicators, biomarkers and neuromonitoring modalities predictive of outcome that may be integrated for future development of sensitive and specific prognostic models...
September 21, 2017: Current Opinion in Neurology
https://www.readbyqxmd.com/read/28938277/multimodality-neuromonitoring-in-adult-traumatic-brain-injury-a-narrative-review
#2
Martin Smith
Neuromonitoring plays an important role in the management of traumatic brain injury. Simultaneous assessment of cerebral hemodynamics, oxygenation, and metabolism allows an individualized approach to patient management in which therapeutic interventions intended to prevent or minimize secondary brain injury are guided by monitored changes in physiologic variables rather than generic thresholds. This narrative review describes various neuromonitoring techniques that can be used to guide the management of patients with traumatic brain injury and examines the latest evidence and expert consensus guidelines for neuromonitoring...
September 22, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28938276/anesthesia-with-dexmedetomidine-and-low-dose-isoflurane-increases-solute-transport-via-the-glymphatic-pathway-in-rat-brain-when-compared-with-high-dose-isoflurane
#3
Helene Benveniste, Hedok Lee, Fengfei Ding, Qian Sun, Ehab Al-Bizri, Rany Makaryus, Stephen Probst, Maiken Nedergaard, Elliot A Stein, Hanbing Lu
BACKGROUND: The glymphatic pathway transports cerebrospinal fluid through the brain, thereby facilitating waste removal. A unique aspect of this pathway is that its function depends on the state of consciousness of the brain and is associated with norepinephrine activity. A current view is that all anesthetics will increase glymphatic transport by inducing unconsciousness. This view implies that the effect of anesthetics on glymphatic transport should be independent of their mechanism of action, as long as they induce unconsciousness...
September 22, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28938144/the-associative-brain-at-work-evidence-from-paired-associative-stimulation-studies-in-humans
#4
REVIEW
A Suppa, A Quartarone, H Siebner, R Chen, V Di Lazzaro, P Del Giudice, Walter Paulus, J C Rothwell, U Ziemann, J Classen
The original protocol of Paired Associative Stimulation (PAS) in humans implies repetitive cortical and peripheral nerve stimuli, delivered at specific inter-stimulus intervals, able to elicit non-invasively long-term potentiation (LTP)- and long-term depression (LTD)-like plasticity in the human motor cortex. PAS has been designed to drive cortical LTP/LTD according to the Hebbian rule of associative plasticity. Over the last two decades, a growing number of researchers have increasingly used the PAS technique to assess cortical associative plasticity in healthy humans and in patients with movement disorders and other neuropsychiatric diseases...
September 5, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28937692/bdnf-at-the-synapse-why-location-matters
#5
M Song, K Martinowich, F S Lee
Neurotrophic factors, a family of secreted proteins that support the growth, survival and differentiation of neurons, have been intensively studied for decades due to the powerful and diverse effects on neuronal physiology, as well as their therapeutic potential. Such efforts have led to a detailed understanding on the molecular mechanisms of neurotrophic factor signaling. One member, brain-derived neurotrophic factor (BDNF) has drawn much attention due to its pleiotropic roles in the central nervous system and implications in various brain disorders...
October 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28937044/priming-of-the-cells-hypoxic-preconditioning-for-stem-cell-therapy
#6
REVIEW
Zheng Z Wei, Yan-Bing Zhu, James Y Zhang, Myles R McCrary, Song Wang, Yong-Bo Zhang, Shan-Ping Yu, Ling Wei
OBJECTIVE: Stem cell-based therapies are promising in regenerative medicine for protecting and repairing damaged brain tissues after injury or in the context of chronic diseases. Hypoxia can induce physiological and pathological responses. A hypoxic insult might act as a double-edged sword, it induces cell death and brain damage, but on the other hand, sublethal hypoxia can trigger an adaptation response called hypoxic preconditioning or hypoxic tolerance that is of immense importance for the survival of cells and tissues...
October 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28937014/sex-bias-in-basic-and-preclinical-noise-induced-hearing-loss-research
#7
Amanda Marie Lauer, Katrina Marie Schrode
INTRODUCTION: Sex differences in brain biochemistry, physiology, structure, and function have been gaining increasing attention in the scientific community. Males and females can have different responses to medications, diseases, and environmental variables. A small number of the approximately 7500 studies of noise-induced hearing loss (NIHL) have identified sex differences, but the mechanisms and characterization of these differences have not been thoroughly studied. The National Institutes of Health (NIH) issued a mandate in 2015 to include sex as a biological variable in all NIH-funded research beginning in January 2016...
September 2017: Noise & Health
https://www.readbyqxmd.com/read/28936885/psychoactive-substances-belonging-to-the-amphetamine-class-potently-activate-brain-carbonic-anhydrase-isoforms-va-vb-vii-and-xii
#8
Andrea Angeli, Fabio Vaiano, Francesco Mari, Elisabetta Bertol, Claudiu T Supuran
Identifying possible new biological activities of psychoactive substances belonging to various chemical classes may lead to a better understanding of their mode of action and side effects. We report here that amines structurally related to amphetamine, a widely used psychoactive substance, such as amphetamine, methamphetamine, phentermine, mephentermine, and chlorphenteramine, potently activate several carbonic anhydrase (CA, EC 4.2.1.1) isoforms involved in important physiological functions. Of the 11 investigated human (h) isoforms, the widespread hCA I and II, the secreted hCA VI, as well as the cytosolic hCA XIII, and membrane-bound hCA IX and XIV were poorly activated by these amines, whereas the extracellular hCA IV, the mitochondrial enzymes hCA VA/VB, the cytosolic hCA VII, and the transmembrane isoform hCA XII were potently activated...
December 2017: Journal of Enzyme Inhibition and Medicinal Chemistry
https://www.readbyqxmd.com/read/28936596/age-related-behavioral-morphological-and-physiological-changes-in-the-hippocampus-of-zitter-rats
#9
Ayuka Ehara, Masao Maekawa, Yuuichi Hori, Kazuhiko Nakadate, Shiuchi Ueda
Convulsive seizure is known to be associated with hippocampal abnormalities, such as hilar cell degeneration, abnormal mossy fiber sprouting in the dentate gyrus (DG) and abnormal expression of immediate early genes. However, whether these morphological changes are a cause or consequence of convulsive seizures has remained contentious. Zitter (zi/zi) rats carry a mutation of the attractin gene and display spongiform degeneration of the brain. Spontaneous convulsive seizures in zi/zi rats over 8 months (M) old were demonstrated using 24-h video monitoring...
September 21, 2017: Anatomical Science International
https://www.readbyqxmd.com/read/28935880/the-role-of-glutamate-transporters-in-the-pathophysiology-of-neuropsychiatric-disorders
#10
REVIEW
Sinead M O'Donovan, Courtney R Sullivan, Robert E McCullumsmith
Altered glutamate transporter expression is a common feature of many neuropsychiatric conditions, including schizophrenia. Excitatory amino acid transporters (EAATs) are responsible for the reuptake of glutamate, preventing non-physiological spillover from the synapse. Postmortem studies have revealed significant dysregulation of EAAT expression in various brain regions at the cellular and subcellular level. Recent animal studies have also demonstrated a role for glutamate spillover as a mechanism of disease...
September 21, 2017: NPJ Schizophrenia
https://www.readbyqxmd.com/read/28935835/total-body-pet-maximizing-sensitivity-to-create-new-opportunities-for-clinical-research-and-patient-care
#11
Simon R Cherry, Terry Jones, Joel S Karp, Jinyi Qi, William Moses, Ramsey Badawi
Positron emission tomography (PET) is widely considered as the most sensitive technique available for non-invasively studying physiology, metabolism and molecular pathways in the living human being. However, the utility of PET, being a photon deficient modality, remains constrained by factors including low signal-to-noise ratio (SNR), long imaging times and concerns regarding radiation dose. Two developments offer the potential to dramatically increase the effective sensitivity of PET. First by increasing the geometric coverage to encompass the entire body, sensitivity can be increased by a factor of ~40 for total-body imaging or a factor of ~4-5 for imaging a single organ such as the brain or heart...
September 21, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28935804/the-growth-pattern-of-neandertals-reconstructed-from-a-juvenile-skeleton-from-el-sidr%C3%A3-n-spain
#12
Antonio Rosas, Luis Ríos, Almudena Estalrrich, Helen Liversidge, Antonio García-Tabernero, Rosa Huguet, Hugo Cardoso, Markus Bastir, Carles Lalueza-Fox, Marco de la Rasilla, Christopher Dean
Ontogenetic studies help us understand the processes of evolutionary change. Previous studies on Neandertals have focused mainly on dental development and inferred an accelerated pace of general growth. We report on a juvenile partial skeleton (El Sidrón J1) preserving cranio-dental and postcranial remains. We used dental histology to estimate the age at death to be 7.7 years. Maturation of most elements fell within the expected range of modern humans at this age. The exceptions were the atlas and mid-thoracic vertebrae, which remained at the 5- to 6-year stage of development...
September 22, 2017: Science
https://www.readbyqxmd.com/read/28933745/effects-of-six-week-ginkgo-biloba-supplementation-on-aerobic-performance-blood-pro-antioxidant-balance-and-serum-brain-derived-neurotrophic-factor-in-physically-active-men
#13
Ewa Sadowska-Krępa, Barbara Kłapcińska, Ilona Pokora, Przemysław Domaszewski, Katarzyna Kempa, Tomasz Podgórski
Extracts of Ginkgo biloba leaves, a natural source of flavonoids and polyphenolic compounds, are commonly used as therapeutic agents for the improvement of both cognitive and physiological performance. The present study was aimed to test the effects of a six-week supplementation with 160 mg/day of a standardized extract of Ginkgo biloba or a matching placebo on aerobic performance, blood antioxidant capacity, and brain-derived neurotrophic factor (BDNF) level in healthy, physically active young men, randomly allocated to two groups (n = 9 each)...
July 26, 2017: Nutrients
https://www.readbyqxmd.com/read/28933212/impact-of-traumatic-brain-injury-on-dopaminergic-transmission
#14
Yuan-Hao Chen, Eagle Yi-Kung Huang, Tung-Tai Kuo, Jonathan Miller, Yung-Hsiao Chiang, Barry J Hoffer
Brain trauma is often associated with severe morbidity and is a major public health concern. Even when injury is mild and no obvious anatomic disruption is seen, many individuals suffer disabling neuropsychological impairments such as memory loss, mood dysfunction, substance abuse, and adjustment disorder. These changes may be related to subtle disruption of neural circuits as well as functional changes at the neurotransmitter level. In particular, there is considerable evidence that dopamine (DA) physiology in the nigrostriatal and mesocorticolimbic pathways might be impaired after traumatic brain injury (TBI)...
July 2017: Cell Transplantation
https://www.readbyqxmd.com/read/28933062/hypothalamic-dysfunction-in-obesity-and-metabolic-disorders
#15
Sara Carmo-Silva, Cláudia Cavadas
The hypothalamus is the brain region responsible for the maintenance of energetic homeostasis. The regulation of this process arises from the ability of the hypothalamus to orchestrate complex physiological responses such as food intake and energy expenditure, circadian rhythm, stress response, and fertility. Metabolic alterations such as obesity can compromise these hypothalamic regulatory functions. Alterations in circadian rhythm, stress response, and fertility further contribute to aggravate the metabolic dysfunction of obesity and contribute to the development of chronic disorders such as depression and infertility...
2017: Advances in Neurobiology
https://www.readbyqxmd.com/read/28931944/errant-gardeners-glial-cell-dependent-synaptic-pruning-and-neurodevelopmental-disorders
#16
REVIEW
Urte Neniskyte, Cornelius T Gross
The final stage of brain development is associated with the generation and maturation of neuronal synapses. However, the same period is also associated with a peak in synapse elimination - a process known as synaptic pruning - that has been proposed to be crucial for the maturation of remaining synaptic connections. Recent studies have pointed to a key role for glial cells in synaptic pruning in various parts of the nervous system and have identified a set of critical signalling pathways between glia and neurons...
September 21, 2017: Nature Reviews. Neuroscience
https://www.readbyqxmd.com/read/28931651/region-specific-rna-m-6-a-methylation-represents-a-new-layer-of-control-in-the-gene-regulatory-network-in-the-mouse-brain
#17
Mengqi Chang, Hongyi Lv, Weilong Zhang, Chunhui Ma, Xue He, Shunli Zhao, Zhi-Wei Zhang, Yi-Xin Zeng, Shuhui Song, Yamei Niu, Wei-Min Tong
N(6)-methyladenosine (m(6)A) is the most abundant epitranscriptomic mark found on mRNA and has important roles in various physiological processes. Despite the relatively high m(6)A levels in the brain, its potential functions in the brain remain largely unexplored. We performed a transcriptome-wide methylation analysis using the mouse brain to depict its region-specific methylation profile. RNA methylation levels in mouse cerebellum are generally higher than those in the cerebral cortex. Heterogeneity of RNA methylation exists across different brain regions and different types of neural cells including the mRNAs to be methylated, their methylation levels and methylation site selection...
September 2017: Open Biology
https://www.readbyqxmd.com/read/28931572/drosophila-neprilysin-1-rescues-memory-deficits-caused-by-amyloid-%C3%AE-peptide
#18
Oriane Turrel, Valérie Goguel, Thomas Preat
Neprilysins are type-II metalloproteinases known to degrade and inactivate a number of small peptides, in particular the mammalian amyloid-β peptide (Aβ). In Drosophila, several neprilysins expressed in the brain are required for middle-term (MTM) and long-term memory (LTM) in the dorsal paired medial (DPM) neurons, a pair of large neurons that broadly innervate the mushroom bodies (MB), the center of olfactory memory. These data indicate that one or several peptides need to be degraded for MTM and LTM. We have previously shown that the fly amyloid precursor protein (APPL) is required for memory in the MB...
September 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28931433/role-of-gabaa-receptors-in-alcohol-use-disorders-suggested-by-chronic-intermittent-ethanol-cie-rodent-model
#19
REVIEW
Richard W Olsen, Jing Liang
GABAergic inhibitory transmission is involved in the acute and chronic effects of ethanol on the brain and behavior. One-dose ethanol exposure induces transient plastic changes in GABAA receptor subunit levels, composition, and regional and subcellular localization. Rapid down-regulation of early responder δ subunit-containing GABAA receptor subtypes mediating ethanol-sensitive tonic inhibitory currents in critical neuronal circuits corresponds to rapid tolerance to ethanol's behavioral responses. Slightly slower, α1 subunit-containing GABAA receptor subtypes mediating ethanol-insensitive synaptic inhibition are down-regulated, corresponding to tolerance to additional ethanol behaviors plus cross-tolerance to other GABAergic drugs including benzodiazepines, anesthetics, and neurosteroids, especially sedative-hypnotic effects...
September 20, 2017: Molecular Brain
https://www.readbyqxmd.com/read/28931301/oxidative-stress-assessment-in-alzheimer-s-disease-a-clinic-setting-study
#20
Andrea Vergallo, Linda Giampietri, Filippo Baldacci, Leda Volpi, Lucia Chico, Cristina Pagni, Filippo Sean Giorgi, Roberto Ceravolo, Gloria Tognoni, Gabriele Siciliano, Ubaldo Bonuccelli
BACKGROUND: Oxidative stress (OS) is a physiological age-related brain process, dramatically overexpressed in neurodegenerative disorders like Alzheimer's disease (AD). Nevertheless, the pathophysiological role of OS in AD pathology has not been clarified yet. OS as a biomarker for AD is a controversial issue. A comparison of previous data is difficult due to a remarkable methodological variability. Most of the previous studies have shown higher levels of OS markers and lower antioxidant power in patients with dementia when compared to mild cognitive impairment (MCI) and healthy controls...
January 1, 2017: American Journal of Alzheimer's Disease and Other Dementias
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