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https://www.readbyqxmd.com/read/28324056/gabaergic-neurons-and-their-modulatory-effects-on-gnrh3-in-zebrafish
#1
Yanlong Song, Binbin Tao, Ji Chen, Shaoting Jia, Zuoyan Zhu, Vance L Trudeau, Wei Hu
Gamma-aminobutyric acid (GABA) is a major amino acid neurotransmitter in the vertebrate brain. To provide detailed information on the distribution of the GABA in zebrafish (Danio rerio), neurons were labeled with mCherry driven by the glutamic acid decarboxylase 67 (gad67) promoter. In the transgenic line Tg(gad67:mCherry), mCherry-positive gad67 cell bodies were predominantly localized to the olfactory bulb, pallial zones, subpallium zones, parvocellular preoptic nucleus, periventricular gray zone of optic tectum, torus semicircularis, posterior tuberculum, medial longitudinal fascicle, caudal zone of periventricular hypothalamus, and oculomotor nucleus...
January 23, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323850/ligand-guided-homology-modelling-of-the-gabab2-subunit-of-the-gabab-receptor
#2
Thibaud Freyd, Dawid Warszycki, Stefan Mordalski, Andrzej J Bojarski, Ingebrigt Sylte, Mari Gabrielsen
γ-aminobutyric acid (GABA) is the main inhibitory neurotransmitter in the central nervous system, and disturbances in the GABAergic system have been implicated in numerous neurological and neuropsychiatric diseases. The GABAB receptor is a heterodimeric class C G protein-coupled receptor (GPCR) consisting of GABAB1a/b and GABAB2 subunits. Two GABAB receptor ligand binding sites have been described, namely the orthosteric GABA binding site located in the extracellular GABAB1 Venus fly trap domain and the allosteric binding site found in the GABAB2 transmembrane domain...
2017: PloS One
https://www.readbyqxmd.com/read/28316115/gabaa-and-gabab-receptor-dysregulation-in-superior-frontal-cortex-of-subjects-with-schizophrenia-and-bipolar-disorder
#3
S Hossein Fatemi, Timothy D Folsom, Paul D Thuras
Schizophrenia and bipolar disorder are complex psychiatric disorders that affect millions of people worldwide. Evidence from gene association and postmortem studies has identified abnormalities of the gamma-aminobutyric acid (GABA) signaling system in both disorders. Abnormal GABAergic signaling and transmission could contribute to the symptomatology of these disorders, potentially through impaired gamma oscillations which normally occur during cognitive processing. In the current study, we examined the protein expression of 14 GABAA and two GABAB receptor subunits in the superior frontal cortex of subjects with schizophrenia, bipolar disorder, and healthy controls...
March 18, 2017: Synapse
https://www.readbyqxmd.com/read/28316020/%C3%AE-hydroxybutyrate-boosts-mitochondrial-and-neuronal-metabolism-but-is-not-preferred-over-glucose-under-activated-conditions
#4
Lavanya B Achanta, Benjamin D Rowlands, Donald S Thomas, Gary D Housley, Caroline D Rae
The ketone body, β-hydroxybutyrate (βOHB), is metabolised by the brain alongside the mandatory brain fuel glucose. To examine the extent and circumstances by which βOHB can supplement glucose metabolism, we studied guinea pig cortical brain slices using increasing concentrations of [U-(13)C]D-βOHB in conjunction with [1-(13)C]D-glucose under conditions of normo- and hypoglycaemia, as well as under high potassium (40 mmol/L K(+)) depolarization in normo- and hypoglycaemic conditions. The contribution of βOHB to synthesis of GABA was also probed by inhibiting the synthesis of glutamine, a GABA precursor, with methionine sulfoximine (MSO)...
March 18, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28315457/anticonvulsant-activity-and-acute-neurotoxic-profile-of-achyranthes-aspera-linn
#5
Dinesh Y Gawande, Dmitry Druzhilovsky, Raghbir Chand Gupta, Vladimir Poroikov, Rajesh Kumar Goel
ETHNOPHARMACOLOGICAL RELEVANCE: Root powder of Achyranthes aspera Linn. (A. aspera) belongs to family Amaranthaceae is used in Indian traditional medicine for the management of epilepsy and its efficacy is widely acclaimed among the different rural communities. AIM OF THE STUDY: The present study was aimed to establish the possible anticonvulsant effect of A. aspera methanolic root extract using acute anticonvulsant models and to evaluate the acute toxicity and neurotoxic potential A...
March 14, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28315396/ischemia-deteriorates-spike-encoding-at-cortical-gabaergic-neurons-and-cerebellar-purkinje-cells-by-increasing-the-intracellular-ca-2
#6
Li Huang, Chun Wang, Rongjing Ge, Hong Ni, Shidi Zhao
GABAergic neurons play a critical role in the central nervous system, such as well-organized behaviors. The ischemic cell death is presumably initiated by neuronal excitotoxicity resulted from the dysfunction of GABAergic neurons. It is not clear how ischemia influences different types of GABAergic neurons and whether intracellular Ca(2+) plays a key role in the ischemic excitotoxicity. We have investigated this issue at cortical GABAergic neurons and cerebellar Purkinje cells by whole-cell recording in mouse brain slices, and the roles of intracellular Ca(2+) are examined by BABTA infusion...
March 14, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28315308/target-specific-alterations-in-the-vip-inhibitory-drive-to-hippocampal-gabaergic-cells-after-status-epilepticus
#7
Linda Suzanne David, Lisa Topolnik
Status epilepticus (SE) is associated with complex reorganization of hippocampal circuits involving a significant loss of specific subtypes of GABAergic interneurons. While adaptive circuit plasticity may increase the chances for recruitment of surviving interneurons, the underlying mechanisms remain largely unknown. We studied the alterations in the inhibitory tone received by the hippocampal CA1 oriens/alveus (O/A) interneurons from the vasoactive intestinal peptide (VIP)- and calretinin (CR)-expressing interneurons using the pilocarpine-induced status epilepticus (SE) model of epilepsy...
March 14, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28300552/monoaminergic-modulation-of-gabaergic-transmission-onto-cerebellar-globular-cells
#8
Moritoshi Hirono, Soichi Nagao, Yuchio Yanagawa, Shiro Konishi
Cerebellar Purkinje cells (PCs) project their axon collaterals to underneath of the PC layer and make GABAergic synaptic contacts with globular cells, a subgroup of Lugaro cells. GABAergic transmission derived from the PC axon collaterals is so powerful that it could inhibit globular cells and regulate their firing patterns. However, the physiological properties and implications of the GABAergic synapses on globular cells remain unknown. Using whole-cell patch-clamp recordings from globular cells in the mouse cerebellum, we examined the monoaminergic modulation of GABAergic inputs to these cells...
March 11, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28296282/sildenafil-reduces-neuroinflammation-in-cerebellum-restores-gabaergic-tone-and-improves-motor-in-coordination-in-rats-with-hepatic-encephalopathy
#9
Ana Agusti, Vicente Hernández-Rabaza, Tiziano Balzano, Lucas Taoro-Gonzalez, Andrea Ibañez-Grau, Andrea Cabrera-Pastor, Santos Fustero, Marta Llansola, Carmina Montoliu, Vicente Felipo
AIMS: Patients with liver disease may develop hepatic encephalopathy (HE), with cognitive impairment and motor in-coordination. Rats with HE due to portacaval shunts (PCS) show motor in-coordination. We hypothesized that in PCS rats: (i) Motor in-coordination would be due to enhanced GABAergic tone in cerebellum; (ii) increased GABAergic tone would be due to neuroinflammation; (iii) increasing cGMP would reduce neuroinflammation and GABAergic tone and restore motor coordination. To assess these hypotheses, we assessed if (i) treatment with sildenafil reduces neuroinflammation; (ii) reduced neuroinflammation is associated with reduced GABAergic tone and restored motor coordination...
March 11, 2017: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/28294133/the-gabab-positive-allosteric-modulator-adx71441-attenuates-alcohol-self-administration-and-relapse-to-alcohol-seeking-in-rats
#10
Eric Augier, Russell S Dulman, Ruslan Damadzic, Andrew Pilling, J Paul Hamilton, Markus Heilig
GABAergic signaling is involved in modulating the reinforcing properties of alcohol, and GABAB receptors have been proposed as a potential target for clinical treatment of alcoholism. The orthosteric GABAB receptor agonist baclofen has been shown to suppress operant self-administration of alcohol in animals and alcohol use in alcohol dependent patients, but its utility is limited by a narrow therapeutic index. We tested the effects of ADX71441, a novel GABAB receptor positive allosteric modulator on alcohol-related behaviors in rats...
March 15, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28293190/gaba-selank-and-olanzapine-affect-the-expression-of-genes-involved-in-gabaergic-neurotransmission-in-imr-32-cells
#11
Elena Filatova, Anastasiya Kasian, Timur Kolomin, Ekaterina Rybalkina, Anelya Alieva, Lyudmila Andreeva, Svetlana Limborska, Nikolay Myasoedov, Galina Pavlova, Petr Slominsky, Maria Shadrina
Clinical studies have shown that Selank had an anxiolytic effect comparable to that of classical benzodiazepine drugs, which can enhance the inhibitory effect of GABA by allosteric modulation of GABAA receptors. These data suggest that the molecular mechanism of the effect of Selank may also be related to its ability to affect the performance of the GABAergic system. To test this hypothesis, we studied the changes in expression of 84 genes involved in the functioning of the GABAergic system and in the processes of neurotransmission in the culture of neuroblastoma IMR-32 cells using qPCR method...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28292832/functional-organization-of-vestibulo-ocular-responses-in-abducens-motoneurons
#12
Haike Dietrich, Stefan Glasauer, Hans Straka
Vestibulo-ocular reflexes (VOR) are the dominating contributors to gaze stabilization in all vertebrates. During horizontal head movements, abducens motoneurons form the final element of the reflex arc that integrates visuo-vestibular inputs into temporally precise motor commands for the lateral rectus eye muscle. Here, we studied a possible differentiation of abducens motoneurons into subtypes by evaluating their morphology, discharge properties and synaptic pharmacology in semi-intact in vitro preparations of larval Xenopus laevis Extracellular nerve recordings during sinusoidal head motion revealed a continuum of resting rates and activation thresholds during vestibular stimulation...
March 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28291262/effects-of-bumetanide-on-neurobehavioral-function-in-children-and-adolescents-with-autism-spectrum-disorders
#13
E Lemonnier, N Villeneuve, S Sonie, S Serret, A Rosier, M Roue, P Brosset, M Viellard, D Bernoux, S Rondeau, S Thummler, D Ravel, Y Ben-Ari
In animal models of autism spectrum disorder (ASD), the NKCC1 chloride-importer inhibitor bumetanide restores physiological (Cl(-))i levels, enhances GABAergic inhibition and attenuates electrical and behavioral symptoms of ASD. In an earlier phase 2 trial; bumetanide reduced the severity of ASD in children and adolescents (3-11 years old). Here we report the results of a multicenter phase 2B study primarily to assess dose/response and safety effects of bumetanide. Efficacy outcome measures included the Childhood Autism Rating Scale (CARS), the Social Responsive Scale (SRS) and the Clinical Global Impressions (CGI) Improvement scale (CGI-I)...
March 14, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28290150/extracellular-matrix-modulation-is-driven-by-experience-dependent-plasticity-during-stroke-recovery
#14
Miriana Jlenia Quattromani, Mathilde Pruvost, Carla Guerreiro, Fredrik Backlund, Elisabet Englund, Anders Aspberg, Tomasz Jaworski, Jakob Hakon, Karsten Ruscher, Leszek Kaczmarek, Denis Vivien, Tadeusz Wieloch
Following stroke, complete cellular death in the ischemic brain area may ensue, with remaining brain areas undergoing tissue remodelling to various degrees. Experience-dependent brain plasticity exerted through an enriched environment (EE) promotes remodelling after central nervous system injury, such as stroke. Post-stroke tissue reorganization is modulated by growth inhibitory molecules differentially expressed within the ischemic hemisphere, like chondroitin sulfate proteoglycans found in perineuronal nets (PNNs)...
March 13, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28289379/dichotomous-distribution-of-putative-cholinergic-interneurons-in-mouse-accessory-olfactory-bulb
#15
Sarah Marking, Kurt Krosnowski, Tatsuya Ogura, Weihong Lin
Sensory information processing in the olfactory bulb (OB) relies on diverse populations of bulbar interneurons. In rodents, the accessory OB (AOB) is divided into two bulbar regions, the anterior (aAOB) and posterior (pAOB), which differ substantially in their circuitry connections and associated behaviors. We previously identified and characterized a large number of morphologically diverse cholinergic interneurons in the main OB (MOB) using transgenic mice to visualize the cell bodies of choline acetyltransferase (ChAT-expressing neurons and immunolabeling (Krosnowski et al...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/28288901/trigeminal-brainstem-modulation-of-persistent-orbicularis-oculi-muscle-activity-in-a-rat-model-of-dry-eye
#16
Mostafeezur Rahman, Kazunari Shiozaki, Keiichiro Okamoto, Randall Thompson, David A Bereiter
Altered corneal reflex activity is a common feature of dry eye disease (DE). Trigeminal sensory nerves supply the ocular surface and terminate at the trigeminal interpolaris/caudalis (ViVc) transition and spinomedullary (VcC1) regions. Although both regions contribute to corneal reflexes, their role under dry eye conditions is not well defined. This study assessed the influence of local inhibitory and excitatory amino acid neurotransmission at the ViVc transition and VcC1 regions on hypertonic saline (HS) evoked orbicularis oculi muscle activity (OOemg) in urethane-anesthetized male rats after exorbital gland removal (DE)...
March 10, 2017: Neuroscience
https://www.readbyqxmd.com/read/28288780/neuroprotective-effects-of-gabaergic-phenols-correlated-with-their-pharmacological-and-antioxidant-properties
#17
Leticia Delgado-Marín, Mariela Sánchez-Borzone, Daniel A García
AIMS: Various investigations have demonstrated the protective capacity of general anesthetics as neuroprotective agents. The effects of propofol against ischemia are known to reside in its antioxidant properties and its GABAergic activity. Other aromatic alcohols have also been reported as able to protect neurons against oxidative damage. The aim of this work is to evaluate the potential neuroprotective effect of some phenols, structurally analogues of propofol, with proven GABAergic activity...
March 10, 2017: Life Sciences
https://www.readbyqxmd.com/read/28287593/reliable-identification-of-living-dopaminergic-neurons-in-midbrain-cultures-using-rna-sequencing-and-th-promoter-driven-egfp-expression
#18
Beverley M Henley, Bruce N Cohen, Charlene H Kim, Heather D Gold, Rahul Srinivasan, Sheri McKinney, Purnima Deshpande, Henry A Lester
In Parkinson's Disease (PD) there is widespread neuronal loss throughout the brain with pronounced degeneration of dopaminergic neurons in the SNc, leading to bradykinesia, rigidity, and tremor. The identification of living dopaminergic neurons in primary Ventral Mesencephalic (VM) cultures using a fluorescent marker provides an alternative way to study the selective vulnerability of these neurons without relying on the immunostaining of fixed cells. Here, we isolate, dissociate, and culture mouse VM neurons for 3 weeks...
February 10, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28284797/comparing-gaba-dependent-physiological-measures-of-inhibition-with-proton-magnetic-resonance-spectroscopy-measurement-of-gaba-using-ultra-high-field-mri
#19
Katherine Dyke, Sophia E Pépés, Chen Chen, Soyoung Kim, Hilmar P Sigurdsson, Amelia Draper, Masud Husain, Parashkev Nachev, Penelope A Gowland, Peter G Morris, Stephen R Jackson
Imbalances in glutamatergic (excitatory) and GABA (inhibitory) signalling within key brain networks are thought to underlie many brain and mental health disorders, and for this reason there is considerable interest in investigating how individual variability in localised concentrations of these molecules relate to brain disorders. Magnetic resonance spectroscopy (MRS) provides a reliable means of measuring, in vivo, concentrations of neurometabolites such as GABA, glutamate and glutamine that can be correlated with brain function and dysfunction...
March 9, 2017: NeuroImage
https://www.readbyqxmd.com/read/28279352/gabaergic-neurons-in-ferret-visual-cortex-participate-in-functionally-specific-networks
#20
Daniel E Wilson, Gordon B Smith, Amanda L Jacob, Theo Walker, Jordane Dimidschstein, Gord Fishell, David Fitzpatrick
Functional circuits in the visual cortex require the coordinated activity of excitatory and inhibitory neurons. Molecular genetic approaches in the mouse have led to the "local non-specific pooling principle" of inhibitory connectivity, in which inhibitory neurons are untuned for stimulus features due to the random pooling of local inputs. However, it remains unclear whether this principle generalizes to species with a columnar organization of feature selectivity such as carnivores, primates, and humans. Here we use virally mediated GABAergic-specific GCaMP6f expression to demonstrate that inhibitory neurons in ferret visual cortex respond robustly and selectively to oriented stimuli...
March 8, 2017: Neuron
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