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https://www.readbyqxmd.com/read/29352669/tms-of-primary-motor-cortex-with-a-biphasic-pulse-activates-two-independent-sets-of-excitable-neurones
#1
Martin Sommer, Matteo Ciocca, Raffaella Chieffo, Paul Hammond, Andreas Neef, Walter Paulus, John C Rothwell, Ricci Hannah
BACKGROUND: Biphasic pulses produced by most commercially available TMS machines have a cosine waveform, which makes it difficult to study the interaction between the two phases of stimulation. OBJECTIVE: We used a controllable pulse TMS (cTMS) device delivering quasi-rectangular pulse outputs to investigate whether monophasic are more effective than biphasic pulses. METHODS: Temporally symmetric ("biphasic") or highly asymmetric ("monophasic") charge-balanced biphasic stimuli were used to target the hand area of motor cortex in the anterior-posterior (AP) or posterior-anterior (PA) initial current direction...
January 5, 2018: Brain Stimulation
https://www.readbyqxmd.com/read/29352625/unilateral-repetitive-tibial-nerve-stimulation-improves-neurogenic-claudication-and-bilateral-f-wave-conduction-in-central-lumbar-spinal-stenosis
#2
Noritsuna Nakajima, Toshikazu Tani, Katsuhito Kiyasu, Masashi Kumon, Shinichirou Taniguchi, Ryuichi Takemasa, Nobuaki Tadokoro, Kazuya Nishida, Masahiko Ikeuchi
BACKGROUND: Repetitive electrical nerve stimulation of the lower limb may improve neurogenic claudication in patients with lumbar spinal stenosis (LSS) as originally described by Tamaki et al. We tested if this neuromodulation technique affects the F-wave conduction on both sides to explore the underlying physiologic mechanisms. METHODS: We studied a total of 26 LSS patients, assigning 16 to a study group receiving repetitive tibial nerve stimulation at the ankle (RTNS) on one leg, and 10 to a group without RTNS...
January 15, 2018: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/29352292/rna-seq-of-kaposi-s-sarcoma-reveals-alterations-in-glucose-and-lipid-metabolism
#3
For Yue Tso, Andrew V Kossenkov, Salum J Lidenge, Owen Ngalamika, John R Ngowi, Julius Mwaiselage, Jayamanna Wickramasinghe, Eun Hee Kwon, John T West, Paul M Lieberman, Charles Wood
Kaposi's sarcoma-associated herpesvirus (KSHV) is the etiologic agent of Kaposi's sarcoma (KS). It is endemic in a number of sub-Saharan African countries with infection rate of >50%. The high prevalence of HIV-1 coupled with late presentation of advanced cancer staging make KS the leading cancer in the region with poor prognosis and high mortality. Disease markers and cellular functions associated with KS tumorigenesis remain ill-defined. Several studies have attempted to investigate changes of the gene profile with in vitro infection of monoculture models, which are not likely to reflect the cellular complexity of the in vivo lesion environment...
January 19, 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29352131/early-impoverished-environment-delays-the-maturation-of-cerebral-cortex
#4
Roberta Narducci, Laura Baroncelli, Gabriele Sansevero, Tatjana Begenisic, Concetta Prontera, Alessandro Sale, Maria Cristina Cenni, Nicoletta Berardi, Lamberto Maffei
The influence of exposure to impoverished environments on brain development is unexplored since most studies investigated how environmental impoverishment affects adult brain. To shed light on the impact of early impoverishment on developmental trajectories of the nervous system, we developed a protocol of environmental impoverishment in which dams and pups lived from birth in a condition of reduced sensory-motor stimulation. Focusing on visual system, we measured two indexes of functional development, that is visual acuity, assessed by using Visual Evoked Potentials (VEPs), and VEP latency...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352094/auditory-brainstem-function-in-microcephaly-related-to-zika-virus-infection
#5
Dimitri Marques Abramov, Tania Saad, Saint-Clair Gomes-Junior, Daniel de Souza E Silva, Izabel Araújo, Maria Elizabeth Lopes Moreira, Vladimir V Lazarev
OBJECTIVE: To study the effect of prenatal Zika virus (ZV) infection on brainstem function reflected in brainstem auditory evoked potentials (BAEPs). METHODS: In a cross-sectional study in 19 children (12 girls) with microcephaly related to ZV infection, aged between 12 and 62 weeks, the brainstem function was examined through BAEPs. The latencies of wave peaks I, III, and V of the left and right ears (n = 37) were standardized according to normative data, and compared between them by 2-tailed t test...
January 19, 2018: Neurology
https://www.readbyqxmd.com/read/29351827/nocturnal-rem-sleep-without-atonia-is-a-diagnostic-biomarker-of-pediatric-narcolepsy
#6
Saadoun Bin-Hasan, Aleksandar Videnovic, Kiran Maski
STUDY OBJECTIVES: Compare nocturnal REM sleep without atonia (nRWA) and REM sleep behavior disorder (RBD) between pediatric patients with and without narcolepsy and determine if the nRWA index is a valid diagnostic biomarker for narcolepsy. METHODS: Retrospective cohort study of children ages 6 to 18 years who completed a nocturnal polysomnogram (PSG) and Multiple Sleep Latency Test (MSLT). Our study sample included 11 patients with narcolepsy type 1 (NT1), 6 with narcolepsy type 2 (NT2), 12 with idiopathic hypersomnia (IH), and 11 with subjective hypersomnia (sHS)...
January 16, 2018: Journal of Clinical Sleep Medicine: JCSM: Official Publication of the American Academy of Sleep Medicine
https://www.readbyqxmd.com/read/29350880/temporal-and-spatial-quantification-of-pain-related-small-fiber-functionality-assessed-using-laser-speckle-contrast-analysis-lasca
#7
Isin Unal-Cevik
BACKGROUND: This study aimed to establish a practical method for assessing pain symptomatology and develop criteria for quantifying small fiber functions, using LASCA. METHODS: Axon flare responses, which reflect small fiber functions, were induced either by histamine or capsaicin applied to the volar surface of the skin of the left forearm. To inhibit small fiber function, local anesthetic cream was applied to the skin of right forearm. The effects on pain symptomatology (severity/timing) and axon flare responses (temporal/spatial characteristics) were measured using LASCA...
January 19, 2018: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/29348927/improved-cognitive-performance-and-event-related-potential-changes-following-working-memory-training-in-patients-with-multiple-sclerosis
#8
Thomas J Covey, Janet L Shucard, Ralph Hb Benedict, Bianca Weinstock-Guttman, David W Shucard
Background: Few studies of cognitive rehabilitation in multiple sclerosis (MS) have targeted working memory specifically. Objective: We examined the effects of n-back working memory training on cognitive performance and brain function in patients with MS. Methods: Patients with MS (n = 12) and healthy controls (HC; n = 12) underwent 20 sessions of n-back working memory training. Before and after training (pre- and posttest) cognitive event-related potential (ERP) measures were obtained during a 3-back task...
January 2018: Multiple Sclerosis Journal—Experimental, Translational and Clinical
https://www.readbyqxmd.com/read/29348202/molecular-characterization-of-latent-gdf8-reveals-mechanisms-of-activation
#9
Ryan G Walker, Jason C McCoy, Magdalena Czepnik, Melanie J Mills, Adam Hagg, Kelly L Walton, Thomas R Cotton, Marko Hyvönen, Richard T Lee, Paul Gregorevic, Craig A Harrison, Thomas B Thompson
Growth/differentiation factor 8 (GDF8), or myostatin, negatively regulates muscle mass. GDF8 is held in a latent state through interactions with its N-terminal prodomain, much like TGF-β. Using a combination of small-angle X-ray scattering and mutagenesis, we characterized the interactions of GDF8 with its prodomain. Our results show that the prodomain:GDF8 complex can exist in a fully latent state and an activated or "triggered" state where the prodomain remains in complex with the mature domain. However, these states are not reversible, indicating the latent GDF8 is "spring-loaded...
January 18, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29347988/efficacy-of-melatonin-for-sleep-disturbance-following-traumatic-brain-injury-a-randomised-controlled-trial
#10
Natalie A Grima, Shantha M W Rajaratnam, Darren Mansfield, Tracey L Sletten, Gershon Spitz, Jennie L Ponsford
BACKGROUND: The study aimed to determine the efficacy of melatonin supplementation for sleep disturbances in patients with traumatic brain injury (TBI). METHODS: This is a randomised double-blind placebo-controlled two-period two-treatment (melatonin and placebo) crossover study. Outpatients were recruited from Epworth and Austin Hospitals Melbourne, Australia. They had mild to severe TBI (n = 33) reporting sleep disturbances post-injury (mean age 37 years, standard deviation 11 years; 67% men)...
January 19, 2018: BMC Medicine
https://www.readbyqxmd.com/read/29345539/working-memory-updating-load-and-binding
#11
Paola Palladino, Caterina Artuso
In the present study, we aimed to examine how specific objects are updated in working memory. We compared conditions in which contents or content-context bindings from working memory were both encoded and updated (Experiment 1). In addition, for bindings, we manipulated the memory load (i.e., number of contents) to maintain during updating. Results indicated that memory load did not specifically affect the process; rather, the content-context binding (vs. single contents) was critical in determining the increase in response latencies...
January 18, 2018: Journal of General Psychology
https://www.readbyqxmd.com/read/29345343/mycobacterium-tuberculosis-rewiring-host-cell-signaling-to-promote-infection
#12
REVIEW
Michael D Stutz, Michelle P Clark, Marcel Doerflinger, Marc Pellegrini
The ability of Mycobacterium tuberculosis to cause disease hinges upon successfully thwarting the innate defenses of the macrophage host cell. The pathogen's trump card is its armory of virulence factors that throw normal host cell signaling into disarray. This process of subverting the macrophage begins upon entry into the cell, when M. tuberculosis actively inhibits the fusion of the bacilli-laden phagosomes with lysosomes. The pathogen then modulates an array of host signal transduction pathways, which dampens the macrophage's host-protective cytokine response, while simultaneously adapting host cell metabolism to stimulate lipid body accumulation...
December 15, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/29343584/human-herpesvirus-8-interferon-regulatory-factors-1-and-3-mediate-replication-and-latency-activities-via-interactions-with-usp7-deubiquitinase
#13
Qiwang Xiang, Hyunwoo Ju, Qian Li, Szu-Chieh Mei, Daming Chen, Young Bong Choi, John Nicholas
Human herpesvirus 8 (HHV-8) encodes four viral interferon regulatory factors (vIRFs 1-4) that likely function to suppress innate immune and cellular stress responses through inhibitory interactions with various cellular proteins involved in these activities. It is notable that vIRFs 1 and 4 have been reported to interact with the deubiquitinase USP7, substrates of which include p53 and p53-targeting and destabilizing ubiquitin E3 ligase MDM2. Structural studies of vIRF-1 and vIRF-4 USP7-binding sequences in association with USP7 have been reported; both involve interactions with N-terminal domain residues of USP7, via EGPS and ASTS motifs in vIRF-1 and vIRF-4, respectively, but vIRF-4 residues also contact the catalytic site...
January 17, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29343582/hiv-replication-and-latency-in-a-humanized-nsg-mouse-model-during-suppressive-oral-combinational-art
#14
Sangeetha Satheesan, Haitang Li, John C Burnett, Mayumi Takahashi, Shasha Li, Shiny Xiaqin Wu, Timothy W Synold, John J Rossi, Jiehua Zhou
Although current combinatorial antiretroviral therapy (cART) is therapeutically effective in the majority of HIV patients, interruption of therapy can cause a rapid rebound in viremia, demonstrating the existence of a stable reservoir of latently infected cells. HIV latency is therefore considered a primary barrier to HIV eradication. Identifying, quantifying, and purging the HIV reservoir is crucial to effectively curing patients and relieving them from the lifelong requirement for therapy. Latently infected transformed cell models have been used to investigate HIV latency; however, they cannot accurately represent the quiescent cellular environment of primary latently infected cells in vivo...
January 17, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29343581/the-5-untranslated-region-of-the-major-immediate-early-mrna-is-necessary-for-efficient-human-cytomegalovirus-replication
#15
Kyle C Arend, Erik M Lenarcic, Nathaniel J Moorman
The human cytomegalovirus (HCMV) IE1 and IE2 proteins are critical regulators of virus replication. Both proteins are needed to efficiently establish lytic infection, and nascent expression of IE1 and IE2 is critical for reactivation from latency. The regulation of IE1 and IE2 protein expression is thus a central event in the outcome of HCMV infection. Transcription of the primary transcript encoding both IE1 and IE2 is well studied, but relatively little is known about the post-transcriptional mechanisms that control IE1 and IE2 protein synthesis...
January 17, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29343578/a-new-quinoline-brd4-inhibitor-targets-a-distinct-latent-hiv-1-reservoir-for-re-activation-from-other-shock-drugs
#16
Erik Abner, Mateusz Stoszko, Lei Zeng, Heng-Chang Chen, Andrea Izquierdo-Bouldstridge, Tsuyoshi Konuma, Eduard Zorita, Elisa Fanunza, Qiang Zhang, Tokameh Mahmoudi, Ming-Ming Zhou, Guillaume J Filion, Albert Jordan
Upon HIV-1 infection, a reservoir of latently infected resting T cells prevents the eradication of the virus from patients. To achieve complete depletion, the existing virus-suppressing antiretroviral therapy must be combined with drugs that reactivate the dormant viruses. We previously described a novel chemical scaffold compound, MMQO (8-methoxy-6-methylquinolin-4-ol) that is able to reactivate viral transcription in several models of HIV latency including J-Lat cells through an unknown mechanism. MMQO potentiates the activity of known latency-reversing agents (LRAs) or 'shock' drugs such as PKC agonists or HDAC inhibitors...
January 17, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29343566/attenuation-of-simian-varicella-virus-infection-by-enhanced-green-fluorescent-protein-in-rhesus-macaques
#17
Ravi Mahalingam, Benedikt B Kaufer, Werner J D Ouwendijk, Georges M G M Verjans, Colin Coleman, Meredith Hunter, Arpita Das, Brent E Palmer, Eric Clambey, Maria A Nagel, Vicki Traina-Dorge
Simian varicella virus (SVV), the primate counterpart of varicella zoster virus, causes varicella (chickenpox), establishes latency in ganglia and reactivates to produce zoster. We previously demonstrated that a recombinant SVV expressing the enhanced green fluorescent protein (rSVV.eGFP) is slightly attenuated both in culture and infected monkeys. Herein, we generated two additional recombinant SVVs to visualize infected cells in vitro and in vivo One harbors eGFP fused to the N-terminus of open reading frame (ORF) 9 (rSVV...
January 17, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29343545/tolloid-cleavage-activates-latent-gdf8-by-priming-the-pro-complex-for-dissociation
#18
Viet Q Le, Roxana E Iacob, Yuan Tian, William McConaughy, Justin Jackson, Yang Su, Bo Zhao, John R Engen, Michelle Pirruccello-Straub, Timothy A Springer
Growth differentiation factor 8 (GDF8)/myostatin is a latent TGF-β family member that potently inhibits skeletal muscle growth. Here, we compared the conformation and dynamics of precursor, latent, and Tolloid-cleaved GDF8 pro-complexes to understand structural mechanisms underlying latency and activation of GDF8. Negative stain electron microscopy (EM) of precursor and latent pro-complexes reveals a V-shaped conformation that is unaltered by furin cleavage and sharply contrasts with the ring-like, cross-armed conformation of latent TGF-β1...
January 17, 2018: EMBO Journal
https://www.readbyqxmd.com/read/29342440/the-critical-warning-sign-of-real-time-brainstem-auditory-evoked-potentials-during-microvascular-decompression-for-hemifacial-spasm
#19
Sang-Ku Park, Byung-Euk Joo, Seunghoon Lee, Jeong-A Lee, Jeong-Ho Hwang, Doo-Sik Kong, Dae-Won Seo, Kwan Park, Hoon-Taek Lee
OBJECTIVE: The aim of this study was to define the critical warning sign of real-time brainstem auditory evoked potential (BAEP) for predicting hearing loss (HL) after microvascular decompression (MVD) for hemifacial spasm (HFS). METHODS: Nine hundred and thirty-two patients with HFS who underwent MVD with intraoperative monitoring (IOM) of BAEP were analyzed. We used a 43.9 Hz/s stimulation rate and 400 averaging trials to obtain BAEP. To evaluate HL, pure-tone audiometry and speech discrimination scoring were performed before and one week after surgery...
January 4, 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29342165/increased-colon-cancer-risk-after-severe-salmonella-infection
#20
Lapo Mughini-Gras, Michael Schaapveld, Jolanda Kramers, Sofie Mooij, E Andra Neefjes-Borst, Wilfrid van Pelt, Jacques Neefjes
BACKGROUND: Colon cancer constitutes one of the most frequent malignancies. Previous studies showed that Salmonella manipulates host cell signaling pathways and that Salmonella Typhimurium infection facilitates colon cancer development in genetically predisposed mice. This epidemiological study examined whether severe Salmonella infection, usually acquired from contaminated food, is associated with increased colon cancer risk in humans. METHODS AND FINDINGS: We performed a nationwide registry-based study to assess colon cancer risk after diagnosed Salmonella infection...
2018: PloS One
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