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https://www.readbyqxmd.com/read/28934723/neural-mechanisms-underlying-the-disruption-of-male-courtship-behavior-by-adult-exposure-to-di-2-ethylhexyl-phthalate-in-mice
#1
Carlos Dombret, Daphné Capela, Kevin Poissenot, Caroline Parmentier, Emma Bergsten, Cédric Pionneau, Solenne Chardonnet, Hélène Hardin-Pouzet, Valérie Grange-Messent, Matthieu Keller, Isabelle Franceschini, Sakina Mhaouty-Kodja
BACKGROUND: Courtship behavior plays a critical role in attracting females and reproduction success. However, the effects of exposure to a ubiquitous contaminant di(2-ethylhexyl) phthalate (DEHP) on these behaviors and, in particular, on courtship vocalizations have not been examined. OBJECTIVE: The effects of adult exposure to DEHP on courtship and mating behaviors and gonadotropic axis and neural mechanisms involved in DEHP-induced effects were analyzed in male mice...
September 1, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28934532/preemptive-caffeine-administration-blocks-the-increase-in-postoperative-pain-caused-by-previous-sleep-loss-in-the-rat-a-potential-role-for-preoptic-adenosine-a2a-receptors-in-sleep-pain-interactions
#2
Viviane S Hambrecht-Wiedbusch, Maya Gabel, Linda J Liu, John P Imperial, Angelo V Colmenero, Giancarlo Vanini
Sleep and pain are reciprocally related, but the precise mechanisms underlying this relationship are poorly understood. This study used a rat model of surgical pain to examine the effect of previous sleep loss on postoperative pain and tested the hypothesis that preoptic adenosinergic mechanisms regulate sleep-pain interactions. Relative to ad libitum sleep, 6 hours of total sleep deprivation prior to a surgical incision significantly enhanced postoperative mechanical hypersensitivity in the affected paw and prolonged the time to recovery from surgery...
September 1, 2017: Sleep
https://www.readbyqxmd.com/read/28934387/mutations-in-tgm6-induce-the-unfolded-protein-response-in-sca35
#3
Debasmita Tripathy, Beatrice Vignoli, Nandini Ramesh, Maria Jose Polanco, Marie Coutelier, Christopher D Stephen, Marco Canossa, Marie-Lorraine Monin, Pascale Aeschlimann, Shannon Turberville, Daniel Aeschlimann, Jeremy D Schmahmann, Marios Hadjivassiliou, Alexandra Durr, Udai B Pandey, Maria Pennuto, Manuela Basso
Spinocerebellar ataxia type 35 (SCA35) is a rare autosomal-dominant neurodegenerative disease caused by mutations in the TGM6 gene, which codes for transglutaminase 6 (TG6). Mutations in TG6 induce cerebellar degeneration by an unknown mechanism. We identified seven patients bearing new mutations in TGM6. To gain insights into the molecular basis of mutant TG6-induced neurotoxicity, we analyzed all the seven new TG6 mutants and the five TG6 mutants previously linked to SCA35. We found that the wild-type (TG6-WT) protein mainly localized to the nucleus and perinuclear area, whereas five TG6 mutations showed nuclear depletion, increased accumulation in the perinuclear area, insolubility and loss of enzymatic function...
October 1, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28934247/the-extent-of-intrauterine-growth-restriction-determines-the-severity-of-cerebral-injury-and-neurobehavioural-deficits-in-rodents
#4
Crystal A Ruff, Stuart D Faulkner, Prakasham Rumajogee, Stephanie Beldick, Warren Foltz, Jennifer Corrigan, Alfred Basilious, Shangjun Jiang, Shanojan Thiyagalingam, Jerome Y Yager, Michael G Fehlings
BACKGROUND: Cerebral Palsy (CP) is the most common physical pediatric neurodevelopmental disorder and spastic diplegic injury is its most frequent subtype. CP results in substantial neuromotor and cognitive impairments that have significant socioeconomic impact. Despite this, its underlying pathophysiological mechanisms and etiology remain incompletely understood. Furthermore, there is a need for clinically relevant injury models, which a) reflect the heterogeneity of the condition and b) can be used to evaluate new translational therapies...
2017: PloS One
https://www.readbyqxmd.com/read/28934226/pathological-alterations-in-liver-injury-following-congestive-heart-failure-induced-by-volume-overload-in-rats
#5
Mohammed Shaqura, Doaa M Mohamed, Noureddin B Aboryag, Lama Bedewi, Lukas Dehe, Sascha Treskatsch, Mehdi Shakibaei, Michael Schäfer, Shaaban A Mousa
Heart failure has emerged as a disease with significant public health implications. Following progression of heart failure, heart and liver dysfunction are frequently combined in hospitalized patients leading to increased morbidity and mortality. Here, we investigated the underlying pathological alterations in liver injury following heart failure. Heart failure was induced using a modified infrarenal aortocaval fistula (ACF) in male Wistar rats. Sham operated and ACF rats were compared for their morphometric and hemodynamic data, for histopathological and ultrastructural changes in the liver as well as differences in the expression of apoptotic factors...
2017: PloS One
https://www.readbyqxmd.com/read/28934222/endogenous-rgs14-is-a-cytoplasmic-nuclear-shuttling-protein-that-localizes-to-juxtanuclear-membranes-and-chromatin-rich-regions-of-the-nucleus
#6
Mary Rose Branch, John R Hepler
Regulator of G protein signaling 14 (RGS14) is a multifunctional scaffolding protein that integrates G protein and H-Ras/MAPkinase signaling pathways to regulate synaptic plasticity important for hippocampal learning and memory. However, to date, little is known about the subcellular distribution and roles of endogenous RGS14 in a neuronal cell line. Most of what is known about RGS14 cellular behavior is based on studies of tagged, recombinant RGS14 ectopically overexpressed in unnatural host cells. Here, we report for the first time a comprehensive assessment of the subcellular distribution and dynamic localization of endogenous RGS14 in rat B35 neuroblastoma cells...
2017: PloS One
https://www.readbyqxmd.com/read/28934119/integrity-of-cerebellar-fastigial-nucleus-intrinsic-neurons-is-critical-for-the-global-ischemic-preconditioning
#7
Eugene V Golanov, Angelique S Regnier-Golanov, Gavin W Britz
Excitation of intrinsic neurons of cerebellar fastigial nucleus (FN) renders brain tolerant to local and global ischemia. This effect reaches a maximum 72 h after the stimulation and lasts over 10 days. Comparable neuroprotection is observed following sublethal global brain ischemia, a phenomenon known as preconditioning. We hypothesized that FN may participate in the mechanisms of ischemic preconditioning as a part of the intrinsic neuroprotective mechanism. To explore potential significance of FN neurons in brain ischemic tolerance we lesioned intrinsic FN neurons with excitotoxin ibotenic acid five days before exposure to 20 min four-vessel occlusion (4-VO) global ischemia while analyzing neuronal damage in Cornu Ammoni area 1 (CA1) hippocampal area one week later...
September 21, 2017: Brain Sciences
https://www.readbyqxmd.com/read/28933587/the-pro-apoptotic-bax-protein-influences-cell-growth-and-differentiation-from-the-nucleus-in-healthy-interphasic-cells
#8
Stéphanie Brayer, Audrey Joannes, Madeleine Jaillet, Elisa Gregianin, Souhir Mahmoudi, Joëlle Marchal Sommé, Aurélie Fabre, Pierre Mordant, Aurélie Cazes, Bruno Crestani, Arnaud A Mailleux
It has become more and more evident that the BCL-2 family proteins mediate a wide range of non-apoptotic functions. The pro-apoptotic BAX protein has been reported in interphasic nuclei. Whether the nuclear form of BAX could be involved in non-apoptotic function is still unknown. Our study showed for the first time that BAX was associated with chromatin in vitro. Next, we used gain and loss of function approaches to decipher the potential role of nuclear BAX in non-apoptotic cells. In vitro, nuclear BAX promoted cell proliferation in lung epithelial cells and primary human lung fibroblasts by modulating CDKN1A expression...
September 21, 2017: Cell Cycle
https://www.readbyqxmd.com/read/28933216/dexamethasone-attenuates-the-enhanced-rewarding-effects-of-cocaine-following-experimental-traumatic-brain-injury
#9
Steven F Merkel, Allison M Andrews, Evan M Lutton, Roshanak Razmpour, Lee Anne Cannella, Servio H Ramirez
Clinical studies have identified traumatic brain injury (TBI) as a risk factor for the development of cocaine dependence. This claim is supported by our recent preclinical studies showing enhancement of the rewarding effects of cocaine in mice sustaining moderate controlled cortical impact (CCI) injury during adolescence. Here we test the efficacy of dexamethasone, an anti-inflammatory corticosteroid, to attenuate augmentation of the behavioral response to cocaine observed in CCI-TBI animals using the conditioned place preference (CPP) assay...
July 2017: Cell Transplantation
https://www.readbyqxmd.com/read/28933060/the-role-of-brain-in-energy-balance
#10
Paulo Matafome, Raquel Seiça
Energy homeostasis is regulated by homeostatic and nonhomeostatic reward circuits which are closely integrated and interrelated. Before, during, and after meals, peripheral nutritional signals, through hormonal and neuronal pathways, are conveyed to selective brain areas, namely the hypothalamic nuclei and the brainstem, the main brain areas for energy balance regulation. These orexigenic and anorexigenic centers are held responsible for the integration of those signals and for an adequate output to peripheral organs involved in metabolism and energy homeostasis...
2017: Advances in Neurobiology
https://www.readbyqxmd.com/read/28932898/differential-effects-of-chaperones-on-yeast-prions-current-view
#11
REVIEW
Andrew G Matveenko, Yury A Barbitoff, Lina Manuela Jay-Garcia, Yury O Chernoff, Galina A Zhouravleva
Endogenous yeast amyloids that control heritable traits and are frequently used as models for human amyloid diseases are termed yeast prions. Yeast prions, including the best studied ones ([PSI (+)] and [URE3]), propagate via intimate interactions with molecular chaperones. Different yeast prions exhibit differential responses to changes in levels, functionality or localization of the components of chaperone machinery. Here, we provide additional data confirming differential effects of chaperones (and specifically, Hsp40s) on yeast prions and summarize current knowledge of the mechanisms underlying chaperone specificities...
September 20, 2017: Current Genetics
https://www.readbyqxmd.com/read/28932670/the-way-towards-ultrafast-growth-of-single-crystal-graphene-on-copper
#12
REVIEW
Zhihong Zhang, Xiaozhi Xu, Lu Qiu, Shaoxin Wang, Tianwei Wu, Feng Ding, Hailin Peng, Kaihui Liu
The exceptional properties of graphene make it a promising candidate in the development of next-generation electronic, optoelectronic, photonic and photovoltaic devices. A holy grail in graphene research is the synthesis of large-sized single-crystal graphene, in which the absence of grain boundaries guarantees its excellent intrinsic properties and high performance in the devices. Nowadays, most attention has been drawn to the suppression of nucleation density by using low feeding gas during the growth process to allow only one nucleus to grow with enough space...
September 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28932622/high-throughput-nuclear-delivery-and-rapid-expression-of-dna-via-mechanical-and-electrical-cell-membrane-disruption
#13
Xiaoyun Ding, Martin Stewart, Armon Sharei, James C Weaver, Robert S Langer, Klavs F Jensen
Nuclear transfection of DNA into mammalian cells is challenging yet critical for many biological and medical studies. Here, by combining cell squeezing and electric-field-driven transport in a device that integrates microfluidic channels with constrictions and microelectrodes, we demonstrate nuclear delivery of plasmid DNA within 1 hour after treatment, the most rapid DNA expression in a high-throughput setting (up to millions of cells per minute per device). Passing cells at high speed through microfluidic constrictions smaller than the cell diameter mechanically disrupts the cell membrane, allowing a subsequent electric field to further disrupt the nuclear envelope and drive DNA molecules into the cytoplasm and nucleus...
2017: Nature biomedical engineering
https://www.readbyqxmd.com/read/28932481/the-7-aza-norbornane-nucleus-of-epibatidine-7-aza-bicyclo-2-2-1-heptan-7-ium-chloride
#14
Sergey N Britvin, Andrey M Rumyantsev
7-Aza-bicyclo-[2.2.1]heptane (7-aza-norbornane) is a bridged heterocyclic nucleus found in epibatidine, the alkaloid isolated from the skin of the tropical poison frog Epipedobates tricolor. Since epibatidine is known as one of the most potent acetyl-choline nicotinic receptor agonists, a plethora of literature has been devoted to this alkaloid. However, there are no structural data on the unsubstituted 7-aza-norbornane, the parent bicyclic ring of epibatidine and its derivatives. We herein present the structural characterization of the 7-aza-bicyclo-[2...
September 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28932207/model-based-magnetization-transfer-imaging-markers-to-characterize-patients-and-asymptomatic-gene-carriers-in-huntington-s-disease
#15
Roland Wiest, Jean-Marc Burgunder, Claus Kiefer
BACKGROUND AND PURPOSE: Huntington's disease (HD) is a chronic progressive neurodegenerative disorder with a long presymptomatic period that opens a window for potential therapies aimed at neuroprotection. Neuroimaging offers the potential to monitor disease-related progression of the disease burden (DB) using model-based magnetization transfer imaging. MATERIALS AND METHODS: We have conducted a cross-sectional study to stratify healthy age-matched controls, premanifest and symptomatic HD patients (n = 30) according to their macromolecular depositions in the caudate nucleus...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28931851/simulation-of-early-dna-damage-after-the-irradiation-of-a-fibroblast-cell-nucleus-using-geant4-dna
#16
Sylvain Meylan, Sébastien Incerti, Mathieu Karamitros, Nicolas Tang, Marta Bueno, Isabelle Clairand, Carmen Villagrasa
In order to improve the understanding of the mechanisms involved in the generation of early DNA damage, a new calculation chain based on the Geant4-DNA toolkit was developed. This work presents for the first time the simulation of the physical, physicochemical and chemical stages of early radiation damage at the scale of an entire human genome (fibroblast, male) and using Geant4-DNA models. The DnaFabric software was extended to generate and export this nucleus model to a text file with a specific format that can be read by Geant4 user applications...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931598/coordinated-increase-of-nuclear-tension-and-lamin-a-with-matrix-stiffness-out-competes-lamin-b-receptor-which-favors-soft-tissue-phenotypes
#17
Amnon Buxboim, Jerome Irianto, Joe Swift, Avathamsa Athirasala, Jae-Won Shin, Florian Rehfeldt, Dennis E Discher
Matrix stiffness that is sensed by a cell or measured by a purely physical probe reflects the intrinsic elasticity of the matrix and also how thick or thin the matrix is. Here, mesenchymal stem cells (MSCs) and their nuclei spread in response to thickness-corrected matrix micro-elasticity, with increases in nuclear tension and nuclear stiffness resulting from increases in myosin-II and lamin-A,C. Linearity between the widely varying projected area of a cell and its nucleus across many matrices, timescales, and myosin-II activity levels indicates a constant ratio of nucleus-to-cell volume, despite the differentiation potential of MSCs...
September 20, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28931260/stereotactic-accuracy-and-surgical-utility-of-the-o-arm-in-deep-brain-stimulation-surgery
#18
Jonathan Dennis Carlson, Kate Elizabeth McLeod, Pamela Sue McLeod, Jamelynn Brooke Mark
BACKGROUND: The stereotactic accuracy of intraoperative imaging is critical to clinical outcome, particularly in "asleep" deep brain stimulation (DBS) surgery that typically forgoes neurophysiological techniques. Different intraoperative imaging modalities and associated accuracies have been reported, including magnetic resonance imaging (MRI), computed tomography (CT), and O-arm. OBJECTIVE: To analyze intraoperative O-arm imaging accuracy and to evaluate the utility of microelectrode mapping...
February 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28931065/chlamydomonas-fap265-is-a-tubulin-polymerization-promoting-protein-essential-for-flagellar-reassembly-and-hatching-of-daughter-cells-from-the-sporangium
#19
Damayanti Tammana, Trinadh Venkata Satish Tammana
Tubulin polymerization promoting proteins (TPPPs) belong to a family of neomorphic moon lighting proteins, involved in various physiological and pathological conditions. In physiological conditions, TPPPs play an important role in microtubule dynamics regulating mitotic spindle assembly and in turn cell proliferation. In pathological situations, TPPPs interact with α-synuclein and β-amyloid and promote their aggregation leading to Parkinson's disease and multiple system atrophy. Orthologs of TPPP family proteins were identified in ciliary proteomes from various organisms including Chlamydomonas but their role in ciliogenesis was not known...
2017: PloS One
https://www.readbyqxmd.com/read/28931039/abnormalities-in-substance-p-neurokinin-1-receptor-binding-in-key-brainstem-nuclei-in-sudden-infant-death-syndrome-related-to-prematurity-and-sex
#20
Fiona M Bright, Robert Vink, Roger W Byard, Jhodie R Duncan, Henry F Krous, David S Paterson
Sudden infant death syndrome (SIDS) involves failure of arousal to potentially life threatening events, including hypoxia, during sleep. While neuronal dysfunction and abnormalities in neurotransmitter systems within the medulla oblongata have been implicated, the specific pathways associated with autonomic and cardiorespiratory failure are unknown. The neuropeptide substance P (SP) and its tachykinin neurokinin-1 receptor (NK1R) have been shown to play an integral role in the modulation of homeostatic function in the medulla, including regulation of respiratory rhythm generation, integration of cardiovascular control, and modulation of the baroreceptor reflex and mediation of the chemoreceptor reflex in response to hypoxia...
2017: PloS One
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