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https://www.readbyqxmd.com/read/28822839/decreased-surface-expression-of-the-%C3%AE-subunit-of-the-gabaa-receptor-contributes-to-reduced-tonic-inhibition-in-dentate-granule-cells-in-a-mouse-model-of-fragile-x-syndrome
#1
Nianhui Zhang, Zechun Peng, Xiaoping Tong, A Kerstin Lindemeyer, Yliana Cetina, Christine S Huang, Richard W Olsen, Thomas S Otis, Carolyn R Houser
While numerous changes in the GABA system have been identified in models of Fragile X Syndrome (FXS), alterations in subunits of the GABAA receptors (GABAARs) that mediate tonic inhibition are particularly intriguing. Considering the key role of tonic inhibition in controlling neuronal excitability, reduced tonic inhibition could contribute to FXS-associated disorders such as hyperactivity, hypersensitivity, and increased seizure susceptibility. The current study has focused on the expression and function of the δ subunit of the GABAAR, a major subunit involved in tonic inhibition, in granule cells of the dentate gyrus in the Fmr1 knockout (KO) mouse model of FXS...
August 16, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28821651/role-of-somatostatin-positive-cortical-interneurons-in-the-generation-of-sleep-slow-waves
#2
Chadd M Funk, Kayla Peelman, Michele Bellesi, William Marshall, Chiara Cirelli, Giulio Tononi
During non-rapid eye movement (NREM) sleep cortical and thalamic neurons oscillate every second or so between ON periods characterized by membrane depolarization and wake-like tonic firing, and OFF periods characterized by membrane hyperpolarization and neuronal silence. Cortical slow waves - the hallmark of NREM sleep - reflect near-synchronous OFF periods in cortical neurons. However, the mechanisms triggering such OFF periods are unclear, as there is little evidence for somatic inhibition. We studied cortical inhibitory interneurons that express somatostatin (SOM), because ∼70% of them are Martinotti cells that target diffusely layer I and can block excitatory transmission presynaptically, at glutamatergic terminals, and postsynaptically, at apical dendrites, without inhibiting the soma...
August 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28819801/botulinum-toxin-treatment-in-multiple-sclerosis-a-review
#3
REVIEW
Yasaman Safarpour, Tahereh Mousavi, Bahman Jabbari
Purpose of review The purpose of this review is to provide updated information on the role of botulinum neurotoxin (BoNT) therapy in multiple sclerosis (MS). This review aims to answer which symptoms of multiple sclerosis may be amenable to BoNT therapy. Recent findings We searched the literature on the efficacy of BoNTs for treatment of MS symptoms up to April 1st 2017 via the Yale University Library's search engine including but not limited to Pub Med and Ovis SP. The level of efficacy was defined according to the assessment's criteria set forth by the Subcommittee on Guideline Development of the American Academy of Neurology...
August 17, 2017: Current Treatment Options in Neurology
https://www.readbyqxmd.com/read/28816653/assembly-rules-for-gabaa-receptor-complexes-in-the-brain
#4
James S Martenson, Tokiwa Yamasaki, Nashid H Chaudhury, David Albrecht, Susumu Tomita
GABAA receptor (GABAAR) pentamers are assembled from a pool of 19 subunits, and variety in subunit combinations diversifies GABAAR functions to tune brain activity. Pentamers with distinct subunit compositions localize differentially at synaptic and non-synaptic sites to mediate phasic and tonic inhibition, respectively. Despite multitudes of theoretical permutations, limited subunit combinations have been identified in the brain. Currently, no molecular model exists for combinatorial GABAAR assembly in vivo...
August 17, 2017: ELife
https://www.readbyqxmd.com/read/28815241/-effect-of-estrogen-on-genioglossus-and-hypoglossal-nucleus-of-female-rats
#5
Bing-Cheng Sun, Lei Liu, Lin Yang, Min Zou, Yu-Xia Hou
PUEPOSE: To study the hypoglossal nucleus spontaneous discharge and genioglossus function of SD rats with different estrogen levels, and explore the possible central pathways of estrogen protecting upper airway stability. METHODS: Thirty SD rats were randomly divided into 3 groups: sham operation group (Sham), ovariectomized group (OVX) and ovariectomized + estrogen covering group (OVX+E2). The hypoglossal nucleus spontaneous discharge frequency and maximum amplitude of spontaneous discharge were measured with extracellular recording technique;BL-420 biological was used to detect the genioglossus EMG and contraction...
April 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28814894/startle-modulation-by-heat-pain-with-varying-threat-levels-in-chronic-pain-patients-and-pain-free-controls
#6
C Horn-Hofmann, D Wolf, S Wolff, M Heesen, K Knippenberg-Bigge, P M Lang, S Lautenbacher
BACKGROUND: Empirical evidence suggests that affective responses to pain are changed in chronic pain. The investigation of startle responses to pain might contribute to clarifying whether such alterations also expand to motivational defensive reactions. We aimed at comparing startle responses to tonic heat pain with high threat (HT) or low threat (LT) in patients with chronic musculoskeletal pain and controls. As pain-related anxiety and catastrophizing are typically elevated in chronic pain, we expected to find stronger startle responses in patients specifically under experimental HT...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28814047/a-simple-tool-to-measure-spasticity-in-spinal-cord-injury-subjects
#7
Arash Arami, Nevio L Tagliamonte, Federica Tamburella, Hsieng-Yung Huang, Marco Molinari, Etienne Burdet
This work presents a wearable device and the algorithms for quantitative modelling of joint spasticity and its application in a pilot group of subjects with different levels of spinal cord injury. The device comprises light-weight instrumented handles to measure the interaction force between the subject and the physical therapist performing the tests, EMG sensors and inertial measurement units to measure muscle activity and joint kinematics. Experimental tests included the passive movement of different body segments, where the spasticity was expected, at different velocities...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813418/mechanism-of-intracellular-allosteric-%C3%AE-2ar-antagonist-revealed-by-x-ray-crystal-structure
#8
Xiangyu Liu, Seungkirl Ahn, Alem W Kahsai, Kai-Cheng Meng, Naomi R Latorraca, Biswaranjan Pani, A J Venkatakrishnan, Ali Masoudi, William I Weis, Ron O Dror, Xin Chen, Robert J Lefkowitz, Brian K Kobilka
G-protein-coupled receptors (GPCRs) pose challenges for drug discovery efforts because of the high degree of structural homology in the orthosteric pocket, particularly for GPCRs within a single subfamily, such as the nine adrenergic receptors. Allosteric ligands may bind to less-conserved regions of these receptors and therefore are more likely to be selective. Unlike orthosteric ligands, which tonically activate or inhibit signalling, allosteric ligands modulate physiologic responses to hormones and neurotransmitters, and may therefore have fewer adverse effects...
August 16, 2017: Nature
https://www.readbyqxmd.com/read/28811941/seizure-associated-takotsubo-syndrome-a-rare-combination
#9
Htay Htay Kyi, Nour Aljariri Alhesan, Sunil Upadhaya, Samer Al Hadidi
Takotsubo cardiomyopathy (TC) is increasingly recognized in neurocritical care population especially in postmenopausal females. We are presenting a 61-year-old African American female with past medical history of epilepsy, bipolar disorder, and hypertension who presented with multiple episodes of seizures due to noncompliance with antiepileptic medications. She was on telemetry which showed ST alarm. Electrocardiogram (ECG) was ordered and showed ST elevation in anterolateral leads and troponins were positive...
2017: Case Reports in Cardiology
https://www.readbyqxmd.com/read/28811831/potent-phosphodiesterase-inhibition-and-nitric-oxide-release-stimulation-of-anti-impotence-thai-medicinal-plants-from-manosroi-iii-database
#10
Aranya Manosroi, Theeraphong Tangjai, Charinya Chankhampan, Worapaka Manosroi, Yaravee Najarut, Worapong Kitdamrongtham, Jiradej Manosroi
Seven plants in the top rank were selected from the "MANOSROI III" database using the two Thai keywords which meant impotence and sexual tonic. Boesenbergia rotunda (L.) Mansf. extract [EDP1-001(1)] gave the highest PDE inhibition activity of 4.36-fold sildenafil, a standard anti-impotence drug. Plumbago indica Linn. extract [EDP2-001(1)] exhibited the highest NO release stimulation activity of 666.85% which was 1.50-fold acetylcholine, a standard drug. Most selected plant extracts were nontoxic to EA.hy926 cells at 1...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28811247/pharmacological-analysis-of-poecilotheria-spider-venoms-in-mice-provides-clues-for-human-treatment
#11
Alexander Andreev-Andrievskiy, Anfisa Popova, Evgeniia Lagereva, Daniil Osipov, Antonina Berkut, Eugene Grishin, Alexander Vassilevski
Bites of tiger spiders belonging to Poecilotheria genus cause moderate to severe pain and long-lasting local or generalized muscle cramps in humans. Bites occur in regions of the spiders' natural habitat, India and Sri Lanka, but the popularity of these colorful tarantulas as pets leads to reports of envenomation cases worldwide. Treatment is predominantly symptomatic and often inadequate since there is almost no clinical or toxicology research data available, and physicians outside India or Sri Lanka typically have no experience in treating such cases...
August 12, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28811221/is-the-hype-around-the-reproductive-health-claims-of-maca-lepidium-meyenii-walp-justified
#12
REVIEW
Shruti Beharry, Michael Heinrich
ETHNOPHARMACOLOGICAL RELEVANCE: Maca - Lepidium meyenii Walp has been cultivated and used by Andean people for over 1,300 to 2000 years in Peru as food and medicine. Starting in the late 1990's it has developed into an important herbal medicine in China and is now cultivated there widely, too. AIM OF STUDY: This study aims to provide an insight into the emergence of maca on the global market as an alternative remedy to treat reproductive health related problems in both men and women and to critically assess these health claims...
August 12, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28808577/transition-from-intravenous-to-enteral-ketamine-for-treatment-of-nonconvulsive-status-epilepticus
#13
Michael A Pizzi, Prasuna Kamireddi, William O Tatum, Jerry J Shih, Daniel A Jackson, William D Freeman
BACKGROUND: Nonconvulsive status epilepticus (NCSE) is a diagnosis that is often challenging and one that may progress to refractory NCSE. Ketamine is a noncompetitive N-methyl-d-aspartate antagonist that increasingly has been used to treat refractory status epilepticus. Current Neurocritical Care Society guidelines recommend intravenous (IV) ketamine infusion as an alternative treatment for refractory status epilepticus in adults. On the other hand, enteral ketamine use in NCSE has been reported in only 6 cases (1 adult and 5 pediatric) in the literature to date...
2017: Journal of Intensive Care
https://www.readbyqxmd.com/read/28807676/crf-modulates-glutamate-transmission-in-the-central-amygdala-of-na%C3%A3-ve-and-ethanol-dependent-rats
#14
Florence P Varodayan, Diego Correia, Dean Kirson, Sophia Khom, Christopher S Oleata, George Luu, Paul Schweitzer, Marisa Roberto
Corticotropin-releasing factor (CRF) signaling in the central nucleus of the amygdala (CeA) is hypothesized to drive the development of alcohol dependence, as it regulates ethanol intake and several anxiogenic behaviors linked to withdrawal. Excitatory glutamatergic neurotransmission contributes to alcohol reinforcement, tolerance and dependence. Therefore, in this study we used in vitro slice electrophysiology to investigate the effects of CRF and its receptor subtype (CRF1 and CRF2) antagonists on both evoked and spontaneous action potential-independent glutamatergic transmission in the CeA of naive and ethanol-dependent Sprague-Dawley rats...
August 11, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28807671/selective-inhibition-of-extra-synaptic-%C3%AE-5-gabaa-receptors-by-s44819-a-new-therapeutic-agent
#15
Lori-An Etherington, Balázs Mihalik, Adrienn Pálvölgyi, István Ling, Katalin Pallagi, Szabolcs Kertész, Péter Varga, Ben G Gunn, Adam R Brown, Matthew R Livesey, Olivia Monteiro, Delia Belelli, József Barkóczy, Michael Spedding, István Gacsályi, Ferenc A Antoni, Jeremy J Lambert
In the mammalian central nervous system (CNS) GABAA receptors (GABAARs) mediate neuronal inhibition and are important therapeutic targets. GABAARs are composed of 5 subunits, drawn from 19 proteins, underpinning expression of 20-30 GABAAR subtypes. In the CNS these isoforms are heterogeneously expressed and exhibit distinct physiological and pharmacological properties. We report the discovery of S44819, a novel tricyclic oxazolo-2,3-benzodiazepine-derivative, that selectively inhibits α5-subunit-containing GABAARs (α5-GABAARs)...
August 12, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28806632/clinical-utility-of-serum-lactate-levels-for-differential-diagnosis-of-generalized-tonic-clonic-seizures-from-psychogenic-nonepileptic-seizures-and-syncope
#16
Ebru Apaydın Doğan, Ali Ünal, Aslıhan Ünal, Çağla Erdoğan
BACKGROUND: The differential diagnosis of generalized tonic-clonic seizures (GTCS), psychogenic nonepileptic seizures (PNES), and syncope constitutes a major challenge. Misdiagnosis rates up to 20 to 30% are reported in the literature. PURPOSE: To assess the clinical utility of serum lactate levels for differentiation of GTCS, PNES, and syncope based on gender differences. METHODS: Data from 270 patients were evaluated retrospectively. Only patients ≥18 years old with the final diagnosis of GTCS, PNES, or syncope in their chart were recruited...
August 11, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28806589/novel-clinical-manifestations-in-patients-with-kcna2-mutations
#17
Monisha Sachdev, Marina Gaínza-Lein, Dmitry Tchapyjnikov, Yong-Hui Jiang, Tobias Loddenkemper, Mohamad A Mikati
PURPOSE: To report novel clinical manifestations of KCNA2 mutation related epileptic encephalopathy. METHODS: Blood samples were sent for whole exome and Sanger sequencing. Seizure types were characterized by clinical criteria and EEG recording. RESULTS: KCNA2 mutations have been reported in 10 cases who presented with focal, absence, generalized tonic-clonic or myoclonic astatic seizures. Here we describe 3 patients with previously unreported, more severe manifestations...
August 5, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28805971/anticonvulsive-evaluation-of-thip-in-the-murine-pentylenetetrazole-kindling-model-lack-of-anticonvulsive-effect-of-thip-despite-functional-%C3%AE-subunit-containing-gabaa-receptors-in-dentate-gyrus-granule-cells
#18
Charlotte Simonsen, Kim Boddum, Nadia L von Schoubye, Alissa Kloppenburg, Kasper Sønderskov, Suzanne L Hansen, Uffe Kristiansen
THIP (4,5,6,7-tetrahydroisoxazolo[5,4-c]pyridin-3-ol) is a GABAA receptor agonist with varying potencies and efficacies at γ-subunit-containing receptors. More importantly, THIP acts as a selective superagonist at δ-subunit-containing receptors (δ-GABAA Rs) at clinically relevant concentrations. Evaluation of THIP as a potential anticonvulsant has given contradictory results in different animal models and for this reason, we reevaluated the anticonvulsive properties of THIP in the murine pentylenetetrazole (PTZ) kindling model...
August 2017: Pharmacology Research & Perspectives
https://www.readbyqxmd.com/read/28805769/-psychiatry-of-the-future-an-overview-of-foreign-scientists-opinions-of-the-position-of-psychiatry-in-the-modern-world
#19
E D Belousova, N N Zavadenko, A A Kholin, A A Sharkov
This review presents the recently published revised classifications of epilepsies and seizure types developed by the International League Against Epilepsy (ILAE). The Classification of Epilepsies includes several diagnostic levels (steps): 1) from seizure type to epilepsy type (generalized/focal/combined generalized and focal/unknown), 2) diagnosis of epilepsy syndrome 3) etiology (genetic/ structural/ infectious/ metabolic/ immune/unknown). A clinician can use any level of the classification. Operational classification of seizure types is replaced by the previous classification that was grounded on the anatomical basis...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/28804613/novel-derivatives-of-phthalimide-with-potent-anticonvulsant-activity-in-ptz-and-mes-seizure-models
#20
Asghar Davood, Maryam Iman, Hanieh Pouriaiee, Hamed Shafaroodi, Sepideh Akhbari, Leila Azimidoost, Erfan Imani, Somaieh Rahmatpour
OBJECTIVES: Phthalimide-based derivatives have anticonvulsant activity like as phenytoin by inhibition of sodium channel. In our previously research we mentioned about some phthalimide derivatives as potent anticonvulsant agents. MATERIALS AND METHODS: Fourteen analogs of 2-substituted phthalimide pharmacophore were synthesized and then were evaluated for the anticonvulsant activities in pentylenetetrazole-induced seizures (PTZ) and maximal electroshock seizure (MES) models...
April 2017: Iranian Journal of Basic Medical Sciences
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