keyword
MENU ▼
Read by QxMD icon Read
search

GABAA

keyword
https://www.readbyqxmd.com/read/28214522/prelimbic-cortex-extracellular-signal-regulated-kinase-1-2-activation-is-required-for-memory-retrieval-of-long-term-inhibitory-avoidance
#1
Fei Luo, Jian Zheng, Xuan Sun, Wei-Ke Deng, Fang Liu, Bao-Ming Li
Neural mechanism underlying memory retrieval has been extensively studied in the hippocampus and amygdala. However, little is known about the role of medial prefrontal cortex in long-term memory retrieval. We evaluate this issue in one-trial step-through inhibitory avoidance (IA) paradigm. Our results showed that, 1) inactivation of mPFC by local infusion of GABAA-receptor agonist muscimol caused severe deficits in retrieval of 1-day and 7-day but had no effects on 2-hour inhibitory avoidance memory; 2) the protein level of phosphorylated-ERK1/2 in mPFC were significantly increased following retrieval of 1-day and 7-day IA memory, so did the numbers of phosphorylated-ERK (pERK) and phosphorylated-CREB (pCREB) labeled neurons; 3) intra-mPFC infusion of ERK kinase inhibitor PD98095 significantly reduced phosphorylated ERK1/2 levels and phosphorylated-ERK1/2 and phosphorylated-CREB labeled cells, and severely impaired retrieval of 7-day IA memory when the drugs were administrated 30 min prior to test...
February 15, 2017: Brain Research
https://www.readbyqxmd.com/read/28211669/3-aminomethyl-derivatives-of-2-phenylimidazo-1-2-a-pyridine-as-positive-allosteric-modulators-of-gabaa-receptor-with-potential-antipsychotic-activity
#2
Monika Marcinkowska, Marcin Kolaczkowski, Krzysztof Kamiński, Adam Bucki, Maciej Henryk Pawlowski, Agata Siwek, Tadeusz Karcz, Gabriela Starowicz, Karolina Sloczynska, Elżbieta Pękala, Anna Wesołowska, Jerzy Samochowiec, Paweł Mierzejewski, Przemyslaw Bienkowski
Schizophrenia is a mental illness characterized by behavioral changes as well as anatomical and neurochemical abnormalities. There has been a remarkable progress in the drug discovery for schizophrenia; however, antipsychotics that act through molecular targets, other than monoaminergic receptors, have not been developed. One of the hypotheses of schizophrenia states that GABAergic dysfunction might be implemented in the pathophysiology of this disease. Our recent findings and previous clinical observations have suggested that modulation of GABAergic system through α1-GABAA receptors would represent an original approach for the treatment of schizophrenia...
February 17, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28209926/characterization-of-the-influence-of-age-on-gabaa-and-glutamatergic-mediated-functions-in-the-dorsolateral-prefrontal-cortex-using-paired-pulse-tms-eeg
#3
Yoshihiro Noda, Reza Zomorrodi, Robin F H Cash, Mera S Barr, Faranak Farzan, Tarek K Rajji, Robert Chen, Zafiris J Daskalakis, Daniel M Blumberger
Gamma-aminobutyric acid (GABA)ergic and glutamatergic neurotransmissions in the prefrontal cortex decreases with age. Further, cognitive function mediated through the dorsolateral prefrontal cortex (DLPFC) also declines with age. Although neuroimaging studies have demonstrated decreased levels of these substances, direct neurophysiological data investigating the effect of aging in the DLPFC in human subjects is lacking. The advent of transcranial magnetic stimulation (TMS) combined with electroencephalography (EEG) has allowed for the assessment of functional neurotransmission in vivo...
February 16, 2017: Aging
https://www.readbyqxmd.com/read/28207286/lc-ms-ms-simultaneous-analysis-of-allopregnanolone-epiallopregnanolone-pregnanolone-dehydroepiandrosterone-and-dehydroepiandrosterone-3-sulfate-in-human-plasma
#4
Luana Lionetto, Fernando De Andrés, Matilde Capi, Martina Curto, Donata Sabato, Maurizio Simmaco, Paola Bossù, Eleonora Sacchinelli, Maria Donata Orfei, Federica Piras, Nerisa Banaj, Gianfranco Spalletta
AIM: Several neuropsychopharmacological properties have been attributed to the 3α-reduced pregnane steroids, allopregnanolone and pregnanolone, as well as to dehydroepiandrosterone sulfate because of their ability to modulate γ-aminobutyric acid (GABAA) receptors in the CNS. In order to understand better their role in several mechanisms in CNS, a new methodology is proposed to monitor these compounds in human plasma. Methodology & results: The analytes were first derivatized with 2-hydrazinopyridine and extracted from plasma using SPE...
February 16, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28202703/investigations-in-gabaa-receptor-antibody-associated-encephalitis
#5
Marianna Spatola, Mar Petit-Pedrol, Mateus Mistieri Simabukuro, Thaís Armangue, Fernanda J Castro, Maria I Barcelo Artigues, Maria R Julià Benique, Leslie Benson, Mark Gorman, Ana Felipe, Ruben L Caparó Oblitas, Myrna R Rosenfeld, Francesc Graus, Josep Dalmau
OBJECTIVE: To report the clinical features, comorbidities, receptor subunit targets, and outcome in patients with anti-GABAA receptor (GABAAR) encephalitis. METHODS: Clinical study of 26 patients, including 17 new (April 2013-January 2016) and 9 previously reported patients. Antibodies to α1, β3, and γ2 subunits of the GABAAR were determined using reported techniques. RESULTS: Patients' median age was 40.5 years (interquartile range 48...
February 15, 2017: Neurology
https://www.readbyqxmd.com/read/28202580/spinal-disinhibition-in-experimental-and-clinical-painful-diabetic-neuropathy
#6
Andrew G Marshall, Corinne Lee-Kubli, Shazli Azmi, Michael Zhang, Maryam Ferdousi, Teresa Mixcoatl-Zecuatl, Ioannis N Petropoulos, Georgios Ponirakis, Mark S Fineman, Hassan Fadavi, Katie Frizzi, Mitra Tavakoli, Maria Jeziorska, Corinne G Jolivalt, Andrew J M Boulton, Nathan Efron, Nigel A Calcutt, Rayaz A Malik
Impaired rate dependent depression (RDD) of the Hoffman-reflex is associated with reduced dorsal spinal cord potassium chloride co-transporter expression and impaired spinal GABAA receptor function, indicative of spinal inhibitory dysfunction. We have investigated the pathogenesis of impaired RDD in diabetic rodents exhibiting features of painful neuropathy and the translational potential of this marker of spinal inhibitory dysfunction in human painful diabetic neuropathy. Impaired RDD and allodynia were present in type 1 and type 2 diabetic rats but not in rats with type 1 diabetes receiving insulin supplementation that did not restore normoglycemia...
February 15, 2017: Diabetes
https://www.readbyqxmd.com/read/28198153/chronic-stress-in-lizards-studies-on-the-behavior-and-benzodiazepine-receptors-in-liolaemus-koslowskyi-and-cnemidophorus-tergolaevigatus
#7
Alejandra Soloaga, Mariana Pueta, Félix Benjamín Cruz, Jackelyn Melissa Kembro, Raul Hector Marin
Behavioral and physiological adaptive responses of animals facing chronic exposure to a single stressor may allow them to overcome its negative effects for future exposures to similar stressful situations. At chemical level, the GABAA /benzodiazepine complex is considered one of the main receptor systems involved in the modulation of stress-induced responses. Here, we describe the behavioral responses of two different lizard species, Liolaemus koslowskyi and Cnemidophorus tergolaevigatus exposed to three potential chronic stressful treatments: (a) high temperature, (b) forced swimming, and (c) simulated predator...
December 2016: Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology
https://www.readbyqxmd.com/read/28197552/altered-channel-conductance-states-and-gating-of-gabaa-receptors-by-a-pore-mutation-linked-to-dravet-syndrome
#8
Ciria C Hernandez, Weijing Kong, Ningning Hu, Yujia Zhang, Wangzhen Shen, Laurel Jackson, Xiaoyan Liu, Yuwu Jiang, Robert L Macdonald
We identified a de novo missense mutation, P302L, in the γ-aminobutyric acid type A (GABAA) receptor γ2 subunit gene GABRG2 in a patient with Dravet syndrome using targeted next-generation sequencing. The mutation was in the cytoplasmic portion of the transmembrane segment M2 of the γ2 subunit that faces the pore lumen. GABAA receptor α1 and β3 subunits were coexpressed with wild-type (wt) γ2L or mutant γ2L(P302L) subunits in HEK 293T cells and cultured mouse cortical neurons. We measured currents using whole-cell and single-channel patch clamp techniques, surface and total expression levels using surface biotinylation and Western blotting, and potential structural perturbations in mutant GABAA receptors using structural modeling...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28196855/inactivation-of-girk-channels-weakens-the-pre-and-postsynaptic-inhibitory-activity-in-dorsal-raphe-neurons
#9
Nerea Llamosas, Luisa Ugedo, Maria Torrecilla
The serotonergic tone of the dorsal raphe (DR) is regulated by 5-HT1A receptors, which negatively control serotonergic activity via the activation of G protein-coupled inwardly rectifying K(+) (GIRK) channels. In addition, DR activity is modulated by local GABAergic transmission, which is believed to play a key role in the development of mood-related disorders. Here, we sought to characterize the role of GIRK2 subunit-containing channels on the basal electrophysiological properties of DR neurons and to investigate whether the presynaptic and postsynaptic activities of 5-HT1A, GABAB, and GABAA receptors are affected by Girk2 gene deletion...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28195311/reduced-local-input-to-fast-spiking-interneurons-in-the-somatosensory-cortex-in-the-gabaa-%C3%AE-2-r43q-mouse-model-of-absence-epilepsy
#10
Stephen P Currie, Liliana L Luz, Sam A Booker, David J A Wyllie, Peter C Kind, Michael I Daw
OBJECTIVE: Absence seizures in childhood absence epilepsy are initiated in the thalamocortical (TC) system. We investigated if these seizures result from altered development of the TC system before the appearance of seizures in mice containing a point mutation in γ-aminobutyric acid A (GABAA ) receptor γ2 subunits linked to childhood absence epilepsy (R43Q). Findings from conditional mutant mice indicate that expression of normal γ2 subunits during preseizure ages protect from later seizures...
February 13, 2017: Epilepsia
https://www.readbyqxmd.com/read/28192273/gabaa-receptor-subtypes-in-the-mouse-brain-regional-mapping-and-diazepam-receptor-occupancy-by-in-vivo-18-f-flumazenil-pet
#11
Adrienne Müller Herde, Dietmar Benke, William T Ralvenius, Linjing Mu, Roger Schibli, Hanns Ulrich Zeilhofer, Stefanie D Krämer
Classical benzodiazepines, which are widely used as sedatives, anxiolytics and anticonvulsants, exert their therapeutic effects through interactions with heteropentameric GABAA receptors composed of two α, two β and one γ2 subunit. Their high affinity binding site is located at the interface between the γ2 and the adjacent α subunit. The α-subunit gene family consists of six members and receptors can be homomeric or mixed with respect to the α-subunits. Previous work has suggested that benzodiazepine binding site ligands with selectivity for individual GABAA receptor subtypes, as defined by the benzodiazepine-binding α subunit, may have fewer side effects and may even be effective in diseases, such as schizophrenia, autism or chronic pain, that do not respond well to classical benzodiazepines...
February 10, 2017: NeuroImage
https://www.readbyqxmd.com/read/28186121/astrocyte-deletion-of-bmal1-alters-daily-locomotor-activity-and-cognitive-functions-via-gaba-signalling
#12
Olga Barca-Mayo, Meritxell Pons-Espinal, Philipp Follert, Andrea Armirotti, Luca Berdondini, Davide De Pietri Tonelli
Circadian rhythms are controlled by a network of clock neurons in the central pacemaker, the suprachiasmatic nucleus (SCN). Core clock genes, such as Bmal1, are expressed in SCN neurons and in other brain cells, such as astrocytes. However, the role of astrocytic clock genes in controlling rhythmic behaviour is unknown. Here we show that ablation of Bmal1 in GLAST-positive astrocytes alters circadian locomotor behaviour and cognition in mice. Specifically, deletion of astrocytic Bmal1 has an impact on the neuronal clock through GABA signalling...
February 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28176641/gaba-a-receptor-subtypes-implications-for-the-treatment-of-pain
#13
Bradford D Fischer
Chronic severe pain is treated most successfully with opioid analgesics, although the clinical use of these drugs is constrained by unwanted side effects, including the potential for abuse. GABAergic neurons are located in spinal nociceptive circuits suggesting that drugs with affinity at these receptors, including benzodiazepine-like drugs, may provide an alternative to opioids for the treatment of pain. However, systemically administered conventional benzodiazepines fail to produce antihyperalgesic effects, likely due to their concurrent sedative properties...
February 7, 2017: CNS & Neurological Disorders Drug Targets
https://www.readbyqxmd.com/read/28176165/hemodynamic-changes-associated-with-interictal-spikes-induced-by-acute-models-of-focal-epilepsy-in-rats-a-simultaneous-electrocorticography-and-near-infrared-spectroscopy-study
#14
Viktoriya Osharina, Ardalan Aarabi, Mana Manoochehri, Mahdi Mahmoudzadeh, Fabrice Wallois
Interictal spikes can be generated by blocking GABAA receptor-mediated inhibition. The nature of the hemodynamic activities associated with interictal spikes in acute models of focal epilepsy based on GABA deactivation has not been determined. We analyzed systemic changes in hemodynamic signals associated with interictal spikes generated by acute models of focal epilepsy. Simultaneous ElectroCorticoGraphy (ECoG) and Near-InfraRed Spectroscopy (NIRS) recordings were obtained in vivo from adult Sprague-Dawley rat brain during semi-periodic focal interictal spikes induced by local cortical application of low doses of Penicillin G (PG) and Bicuculline Methiodide (BM) as GABA deactivation agents...
February 7, 2017: Brain Topography
https://www.readbyqxmd.com/read/28163252/the-legacy-pesticide-dieldrin-acts-as-a-teratogen-and-alters-the-expression-of-dopamine-transporter-and-dopamine-receptor-2a-in-zebrafish-danio-rerio-embryos
#15
Kathleena I Sarty, Andrew Cowie, Christopher J Martyniuk
Dieldrin (DLD) is a lipophilic pesticide that shows environmental persistence. The objectives were to determine the effects of DLD on GABAergic and dopaminergic systems in developing zebrafish. Both chorionated and dechorionated embryos (~24h post-hatch) were exposed to a single concentration of DLD (0.347-3470μM) for 48h. Following exposure, a subset of larvae was placed into clean water for 6days (i.e. depuration phase). Chorionated embryos showed <15% mortality while dechorionated embryos showed higher mortality (>30%), suggesting that the chorion protected the embryos...
February 3, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28163104/age-dependent-regulation-of-gaba-transmission-by-kappa-opioid-receptors-in-the-basolateral-amygdala-of-sprague-dawley-rats
#16
K R Przybysz, D F Werner, M R Diaz
Anxiety disorders are one of the most common and debilitating mental illnesses worldwide. Growing evidence indicates an age-dependent rise in the incidence of anxiety disorders from adolescence through adulthood, suggestive of underlying neurodevelopmental mechanisms. Kappa opioid receptors (KORs) are known to contribute to the development and expression of anxiety; however, the functional role of KORs in the basolateral amygdala (BLA), a brain structure critical in mediating anxiety, particularly across ontogeny, are unknown...
February 3, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28161868/protective-effect-of-resveratrol-on-the-brain-in-a-rat-model-of-epilepsy
#17
Zhen Li, Zhuyan You, Min Li, Liang Pang, Juan Cheng, Liecheng Wang
Accumulating evidence has suggested resveratrol as a promising drug candidate for the treatment of epilepsy. To validate this, we tested the protective effect of resveratrol on a kainic acid (KA)-induced epilepsy model in rats and investigated the underlying mechanism. We found that acute resveratrol application partially inhibited evoked epileptiform discharges in the hippocampal CA1 region. During acute, silent and chronic phases of epilepsy, the expression of hippocampal kainate glutamate receptor (GluK2) and the GABAA receptor alpha1 subunit (GABAAR-alpha1) was up-regulated and down-regulated, respectively...
February 4, 2017: Neuroscience Bulletin
https://www.readbyqxmd.com/read/28155926/imaging-and-structural-studies-of-dna-protein-complexes-and-membrane-ion-channels
#18
M Marini, T Limongi, A Falqui, A Genovese, M Allione, M Moretti, S Lopatin, L Tirinato, G Das, B Torre, A Giugni, F Cesca, F Benfenati, E Di Fabrizio
In bio-imaging by electron microscopy, damage of the sample and limited contrast are the two main hurdles for reaching high image quality. We extend a new preparation method based on nanofabrication and super-hydrophobicity to the imaging and structural studies of nucleic acids, nucleic acid-protein complexes (DNA/Rad51 repair protein complex) and neuronal ion channels (gap-junction, K(+) and GABAA channels) as paradigms of biological significance and increasing complexity. The preparation method is based on the liquid phase and is compatible with physiological conditions...
February 3, 2017: Nanoscale
https://www.readbyqxmd.com/read/28153485/loop-f-of-the-%C3%AE-subunit-determines-the-pharmacologic-profile-of-novel-competitive-inhibitors-of-gabaa-receptors
#19
Balázs Mihalik, Adrienn Pálvölgyi, Ferenc Bogár, Katalin Megyeri, István Ling, József Barkóczy, Ferenc Bartha, Tamás A Martinek, István Gacsályi, Ferenc A Antoni
The neurotransmitter γ-amino butyric acid (GABA) has a fundamental role in CNS function and ionotropic (GABAA) receptors that mediate many of the actions of GABA are important therapeutic targets. This study reports the mechanism of action of novel GABAA antagonists based on a tricyclic oxazolo-2,3-benzodiazepine scaffold. These compounds are orthosteric antagonists of GABA on heteropentameric GABAA receptors of αxβ2γ2 configuration expressed in HEK293 cells. In silico modelling predicted that the test compounds docked in the GABA binding-pocket and would interact with amino-acid residues in the α- and β-subunit interface that are known to be important for the binding of GABA...
January 31, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28150939/antinociceptive-effects-of-a-novel-%C3%AE-2-%C3%AE-3-subtype-selective-gabaa-receptor-positive-allosteric-modulator
#20
Lakeisha A Lewter, Janet L Fisher, Justin N Siemian, Kashi Reddy Methuku, Michael M Poe, James M Cook, Jun-Xu Li
Pain remains a challenging clinical condition and spinal GABAA receptors are crucial modulators of pain processing. α2/α3-subtype GABAA receptors mediate the analgesic actions of benzodiazepines. Positive allosteric modulators (PAMs) at α2/α3-subtype GABAA receptors may have analgesic potential. Here we report a new selective α2/α3-subtype GABAA receptor PAM in in vitro and in vivo pain assays. KRM-II-81 demonstrated similar efficacy at α1/α2/α3 GABAA receptors and negligible efficacy at α4/α5/α6 GABAA receptors, with α2 and α3-subtypes being 17- and 28-fold more potent than α1 subtypes in HEK-293T cells expressing GABAA receptors with different α subunits...
February 2, 2017: ACS Chemical Neuroscience
keyword
keyword
99098
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"