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https://www.readbyqxmd.com/read/28534661/characterization-of-human-fetal-brain-endothelial-cells-reveals-barrier-properties-suitable-for-in%C3%A2-vitro-modeling-of-the-bbb-with-syngenic-co-cultures
#1
Allison M Andrews, Evan M Lutton, Lee A Cannella, Nancy Reichenbach, Roshanak Razmpour, Matthew J Seasock, Steven J Kaspin, Steven F Merkel, Dianne Langford, Yuri Persidsky, Servio H Ramirez
Endothelial cells (ECs) form the basis of the blood-brain barrier (BBB), a physical barrier that selectively restricts transport into the brain. In vitro models can provide significant insight into BBB physiology, mechanisms of human disease pathology, toxicology, and drug delivery. Given the limited availability of primary human adult brain microvascular ECs ( aBMVECs), human fetal tissue offers a plausible alternative source for multiple donors and the opportunity to build syngenic tri-cultures from the same host...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28534217/autism-spectrum-disorder-associated-genes-and-the-development-of-dentate-granule-cells
#2
REVIEW
Hidenori Ito, Rika Morishita, Koh-Ichi Nagata
Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by severe clinical symptoms such as the deficiency of the social communication, repetitive and stereotyped behaviors, and restricted interests. Although complex genetic and environmental factors are thought to contribute to the development of ASD, the precise etiologies are largely unknown. Neuroanatomical observations have been made of developmental abnormalities in different brain regions, including dentate gyrus of hippocampus, which is widely accepted as the center for learning and memory...
May 22, 2017: Medical Molecular Morphology
https://www.readbyqxmd.com/read/28534084/the-emerging-link-between-o-glcnacylation-and-neurological-disorders
#3
REVIEW
Xiaofeng Ma, He Li, Yating He, Junwei Hao
O-linked β-N-acetylglucosaminylation (O-GlcNAcylation) is involved in the regulation of many cellular cascades and neurological diseases such as Alzheimer's disease (AD), Parkinson's disease (PD), and stroke. In the brain, the expression of O-GlcNAcylation is notably heightened, as is that of O-linked N-acetylglucosaminyltransferase (OGT) and β-N-acetylglucosaminidase (OGA), the presence of which is prominent in many regions of neurological importance. Most importantly, O-GlcNAcylation is believed to contribute to the normal functioning of neurons; conversely, its dysregulation participates in the pathogenesis of neurological disorders...
May 22, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28534002/purposeful-engagement-healthy-aging-and-the-brain
#4
Carol D Ryff, Aaron S Heller, Stacey M Schaefer, Carien van Reekum, Richard J Davidson
PURPOSE OF REVIEW: Research on psychological well-being in later life has identified strengths and vulnerabilities that occur with aging. We review the conceptual and philosophical foundations of a eudaimonic model of well-being and its empirical translation into six key dimensions of positive functioning. We also consider its implications for health, broadly defined. RECENT FINDINGS: Numerous findings from national longitudinal samples of U.S. adults are described...
December 2016: Current Behavioral Neuroscience Reports
https://www.readbyqxmd.com/read/28533888/neuroprotective-effects-of-melatonin-administration-against-chronic-immobilization-stress-in-rats
#5
Asmaa Ms Gomaa, Heba M Galal, Amal T Abou-Elgait
Chronic stress can impair brain functions and play a well-known role in the development of stress-related disorders such as anxiety. Melatonin (Mel) is a neurohormone which regulate several physiological processes including mood and behavior. This experimental study was designed to evaluate the effect of Mel on chronic immobilization stress (CIS) for 6 weeks in rats and to elucidate its possible underlying mechanisms. Twenty-eight adult male Wistar albino rats were divided into four equal groups: the control group, the Mel-treated group which was injected daily with Mel (10 mg/kg/day; IP) for 6 weeks, the stressed group which was subjected to CIS protocol daily for 6 weeks, and the Mel-treated stressed group which was injected with Mel and concurrently exposed to CIS protocol for 6 weeks...
2017: International Journal of Physiology, Pathophysiology and Pharmacology
https://www.readbyqxmd.com/read/28533765/leptin-induces-mitosis-and-activates-the-canonical-wnt-%C3%AE-catenin-signaling-pathway-in-neurogenic-regions-of-xenopus-tadpole-brain
#6
Melissa Cui Bender, Christopher J Sifuentes, Robert J Denver
In addition to its well-known role as an adipostat in adult mammals, leptin has diverse physiological and developmental actions in vertebrates. Leptin has been shown to promote development of hypothalamic circuits and to induce mitosis in different brain areas of mammals. We investigated the ontogeny of leptin mRNA, leptin actions on cell proliferation in the brain, and gene expression in the preoptic area/hypothalamus of tadpoles of Xenopus laevis. The level of leptin mRNA was low in premetamorphic tadpoles, but increased strongly at the beginning of metamorphosis and peaked at metamorphic climax...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28533756/guinea-pig-oxygen-sensing-and-carotid-body-functional-properties
#7
Elvira Gonzalez-Obeso, Inmaculada Docio, Elena Olea, Angel Cogolludo, Ana Obeso, Asuncion Rocher, Angela Gomez-Niño
Mammals have developed different mechanisms to maintain oxygen supply to cells in response to hypoxia. One of those mechanisms, the carotid body (CB) chemoreceptors, is able to detect physiological hypoxia and generate homeostatic reflex responses, mainly ventilatory and cardiovascular. It has been reported that guinea pigs, originally from the Andes, have a reduced ventilatory response to hypoxia compared to other mammals, implying that CB are not completely functional, which has been related to genetically/epigenetically determined poor hypoxia-driven CB reflex...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28533754/the-ace2-angiotensin-1-7-mas-receptor-axis-pleiotropic-roles-in-cancer
#8
REVIEW
Juanjuan Xu, Jinshuo Fan, Feng Wu, Qi Huang, Mengfei Guo, Zhilei Lv, Jieli Han, Limin Duan, Guorong Hu, Lian Chen, Tingting Liao, Wanli Ma, Xiaonan Tao, Yang Jin
Cancer remains one of the most common causes of death and disability and represents a major economic burden in industrialized nations. The renin-angiotensin system (RAS) has been well-recognized as one of the most important regulators of both normal and pathological physiological processes in the brain, kidney, heart, and blood vessels. The activation of the angiotensin-converting enzyme 2/angiotensin-(1-7)/mitochondrial assembly receptor [ACE2/Ang-(1-7)/MasR] axis, which is one component of the RAS, has recently been identified as a critical component of pulmonary systems, gastric mucosa, and cancer...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28533746/intraoperative-frontal-alpha-band-power-correlates-with-preoperative-neurocognitive-function-in-older-adults
#9
Charles M Giattino, Jacob E Gardner, Faris M Sbahi, Kenneth C Roberts, Mary Cooter, Eugene Moretti, Jeffrey N Browndyke, Joseph P Mathew, Marty G Woldorff, Miles Berger
Each year over 16 million older Americans undergo general anesthesia for surgery, and up to 40% develop postoperative delirium and/or cognitive dysfunction (POCD). Delirium and POCD are each associated with decreased quality of life, early retirement, increased 1-year mortality, and long-term cognitive decline. Multiple investigators have thus suggested that anesthesia and surgery place severe stress on the aging brain, and that patients with less ability to withstand this stress will be at increased risk for developing postoperative delirium and POCD...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28533660/genes-emotions-and-gut-microbiota-the-next-frontier-for-the-gastroenterologist
#10
REVIEW
Arturo Panduro, Ingrid Rivera-Iñiguez, Maricruz Sepulveda-Villegas, Sonia Roman
Most medical specialties including the field of gastroenterology are mainly aimed at treating diseases rather than preventing them. Genomic medicine studies the health/disease process based on the interaction of the human genes with the environment. The gastrointestinal (GI) system is an ideal model to analyze the interaction between our genes, emotions and the gut microbiota. Based on the current knowledge, this mini-review aims to provide an integrated synopsis of this interaction to achieve a better understanding of the GI disorders related to bad eating habits and stress-related disease...
May 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28533325/physiologic-regulation-of-heart-rate-and-blood-pressure-involves-connexin-36-containing-gap-junctions
#11
Varinder K Lall, Gareth Bruce, Larysa Voytenko, Mark Drinkhill, Kerstin Wellershaus, Klaus Willecke, Jim Deuchars, Susan A Deuchars
Chronically elevated sympathetic nervous activity underlies many cardiovascular diseases. Elucidating the mechanisms contributing to sympathetic nervous system output may reveal new avenues of treatment. The contribution of the gap junctional protein connexin 36 (Cx36) to the regulation of sympathetic activity and thus blood pressure and heart rate was determined using a mouse with specific genetic deletion of Cx36. Ablation of the Cx36 protein was confirmed in sympathetic preganglionic neurons of Cx36 knockout (KO) mice...
May 22, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28533117/activation-induced-changes-in-gaba-functional-mrs-at-7-t-with-mega-slaser
#12
Chen Chen, Hilmar P Sigurdsson, Sophia E Pépés, Dorothee P Auer, Peter G Morris, Paul S Morgan, Penny A Gowland, Stephen R Jackson
Functional magnetic resonance spectroscopy (fMRS) has been used to assess the dynamic metabolic responses of the brain to a physiological stimulus non-invasively. However, only limited information on the dynamic functional response of γ-aminobutyric acid (GABA), the primary inhibitory neurotransmitter in the brain, is available. We aimed to measure the activation-induced changes in GABA unambiguously using a spectral editing method, instead of the conventional direct detection techniques used in previous fMRS studies...
May 19, 2017: NeuroImage
https://www.readbyqxmd.com/read/28532548/mtorc1-in-agrp-neurons-integrates-exteroceptive-and-interoceptive-food-related-cues-in-the-modulation-of-adaptive-energy-expenditure-in-mice
#13
Luke K Burke, Tamana Darwish, Althea R Cavanaugh, Sam Virtue, Emma Roth, Joanna Morro, Shun-Mei Liu, Jing Xia, Jeffrey W Dalley, Keith Burling, Streamson Chua, Toni Vidal-Puig, Gary J Schwartz, Clémence Blouet
Energy dissipation through interscapular brown adipose tissue (iBAT) thermogenesis is an important contributor to adaptive energy expenditure. However, it remains unresolved how acute and chronic changes in energy availability are detected by the brain to adjust iBAT activity and maintain energy homeostasis. Here, we provide evidence that AGRP inhibitory tone to iBAT represents an energy-sparing circuit that integrates environmental food cues and internal signals of energy availability. We establish a role for the nutrient-sensing mTORC1 signaling pathway within AGRP neurons in the detection of environmental food cues and internal signals of energy availability, and in the bi-directional control of iBAT thermogenesis during nutrient deficiency and excess...
May 23, 2017: ELife
https://www.readbyqxmd.com/read/28532450/lps-induced-systemic-inflammation-reveals-an-immunomodulatory-role-for-the-prion-protein-at-the-blood-brain-interface
#14
Ø Salvesen, M R Reiten, A Espenes, M K Bakkebø, M A Tranulis, C Ersdal
BACKGROUND: The cellular prion protein (PrP(C)) is an evolutionary conserved protein abundantly expressed not only in the central nervous system but also peripherally including the immune system. A line of Norwegian dairy goats naturally devoid of PrP(C) (PRNP (Ter/Ter)) provides a novel model for studying PrP(C) physiology. METHODS: In order to explore putative roles for PrP(C) in acute inflammatory responses, we performed a lipopolysaccharide (LPS, Escherichia coli O26:B6) challenge of 16 goats (8 PRNP (+/+) and 8 PRNP (Ter/Ter)) and included 10 saline-treated controls (5 of each PRNP genotype)...
May 22, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28532435/early-growth-response-protein-1-regulates-promoter-activity-of-%C3%AE-plasma-membrane-calcium-atpase-2-a-major-calcium-pump-in-the-brain-and-auditory-system
#15
Rebecca R Minich, Jin Li, Bruce L Tempel
BACKGROUND: Along with sodium/calcium (Ca(2+)) exchangers, plasma membrane Ca(2+) ATPases (ATP2Bs) are main regulators of intracellular Ca(2+) levels. There are four ATP2B paralogs encoded by four different genes. Atp2b2 encodes the protein pump with the fastest activation, ATP2B2. In mice, the Atp2b2 transcript has several alternate transcriptional start site variants: α, β, µ and δ. These variants are expressed in developmental and tissue specific manners. The α and β Atp2b2 transcripts are equally expressed in the brain...
May 22, 2017: BMC Molecular Biology
https://www.readbyqxmd.com/read/28532350/corollary-discharge-and-oculomotor-proprioception-cortical-mechanisms-for-spatially-accurate-vision
#16
Linus D Sun, Michael E Goldberg
A classic problem in psychology is understanding how the brain creates a stable and accurate representation of space for perception and action despite a constantly moving eye. Two mechanisms have been proposed to solve this problem: Herman von Helmholtz's idea that the brain uses a corollary discharge of the motor command that moves the eye to adjust the visual representation, and Sir Charles Sherrington's idea that the brain measures eye position to calculate a spatial representation. Here, we discuss the cognitive, neuropsychological, and physiological mechanisms that support each of these ideas...
October 14, 2016: Annual Review of Vision Science
https://www.readbyqxmd.com/read/28531897/magnetic-resonance-imaging-of-the-brain-of-a-monotreme-the-short-beaked-echidna-tachyglossus-aculeatus
#17
Sandilya Cherupalli, Craig D Hardman, Andre Bongers, Ken W S Ashwell
We used magnetic resonance imaging to study the anatomy of cortical regions, nuclear groups, and major tracts in the brain of a monotreme, i.e., the short-beaked echidna (Tachyglossus aculeatus). Our specimens were from a collection held at the Australian Museum in Sydney and had been stored in formaldehyde solution for at least 70 years. Despite this, we were able to detect fine detail in the nuclear divisions of structures as well as in fiber tracts. In particular, we could detect the medial lemniscus as it approached the ventral posterior thalamic nucleus, subdivisions within the ventral posterior thalamic nucleus, lamination and subdivisions within the hippocampal formation, components of the olfactory pathways, and nuclei within the temporal amygdala...
May 23, 2017: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/28531270/utilization-of-quantitative-susceptibility-mapping-for-direct-targeting-of-the-subthalamic-nucleus-during-deep-brain-stimulation-surgery
#18
Jonathan Rasouli, Ritesh Ramdhani, Fedor E Panov, Alexey Dimov, Yan Zhang, Catherine Cho, Yi Wang, Brian Harris Kopell
BACKGROUND: Deep brain stimulation of the subthalamic nucleus (STN) has demonstrated efficacy in improving motor disability in Parkinson's disease. The recently developed quantitative susceptibility mapping (QSM) technique, which can accurately map iron deposits in deep brain nuclei, promises precise targeting of the STN. OBJECTIVE: To demonstrate the use of QSM to target STN effectively by correlating with classical physiological-based targeting measures in a prospective study...
May 21, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28530831/blue-shifted-green-fluorescent-protein-homologs-are-brighter-than-enhanced-green-fluorescent-protein-under-two-photon-excitation
#19
Rosana S Molina, Tam M Tran, Robert E Campbell, Gerard Glenn Lambert, Anya Salih, Nathan C Shaner, Thomas E Hughes, Mikhail Drobizhev
Fluorescent proteins (FPs) are indispensable markers for two-photon imaging of live tissue, especially in the brains of small model organisms. The quantity of physiologically relevant data collected, however, is limited by heat-induced damage of the tissue due to the high intensities of the excitation laser. We seek to minimize this damage by developing FPs with improved brightness. Among FPs with the same chromophore structure, the spectral properties can vary widely due to differences in the local protein environment...
May 22, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28530342/-behavioral-physiological-and-morphological-characteristics-associated-with-post-traumatic-response-to-continuous-exposure-versus-alternate-exposure-in-an-animal-model-of-post-traumatic-stress-disorder
#20
Ishay Ostfeld, Zeev Kaplan, Hagit Cohen
AIMS: The aim of this study was to approximate these conditions in an animal model of post-traumatic stress disorder (PTSD). More specifically, the neurobiological basis of these conditions, focusing on stress-related behavioral changes, HPA-axis and morphological were evaluated. The intention was to employ this well-validated, reproducible and reliable model for PTSD, to elicit data which will provide some guidance in the planning of a prospective study involving military personal. BACKGROUND: Combat personnel are exposed to significant stress and hardship, both physical and emotional, during their service and especially during active combat...
December 2016: Harefuah
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