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https://www.readbyqxmd.com/read/28087766/control-of-amygdala-circuits-by-5-ht-neurons-via-5-ht-and-glutamate-co-transmission
#1
Ayesha Sengupta, Marco Bocchio, David M Bannerman, Trevor Sharp, Marco Capogna
: The serotonin (5-HT) system and the amygdala are key regulators of emotional behavior. Several lines of evidence suggest that 5-HT transmission in the amygdala is implicated in the susceptibility and drug treatment of mood disorders. Thus, elucidating the physiological mechanisms through which midbrain 5-HT neurons modulate amygdala circuits could be pivotal in understanding emotional regulation in health and disease. To shed light on these mechanisms, we performed patch-clamp recordings from basal amygdala (BA) neurons in brain slices from mice with channelrhodopsin (ChR2) genetically targeted to 5-HT neurons...
January 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28079752/changes-in-dorsal-root-ganglion-gene-expression-in-response-to-spinal-cord-stimulation
#2
Dana M Tilley, David L Cedeño, Courtney A Kelley, Margaret DeMaegd, Ramsin Benyamin, Ricardo Vallejo
BACKGROUND AND OBJECTIVES: Spinal cord stimulation (SCS) has been shown to influence pain-related genes in the spinal cord directly under the stimulating electrodes. There is limited information regarding changes occurring at the dorsal root ganglion (DRG). This study evaluates gene expression in the DRG in response to SCS therapy. METHODS: Rats were randomized into experimental or control groups (n = 6 per group). Experimental animals underwent spared-nerve injury, implantation of lead, and continuous SCS (72 hours)...
January 11, 2017: Regional Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/28074859/identifying-a-gene-expression-signature-of-cluster-headache-in-blood
#3
Else Eising, Nadine Pelzer, Lisanne S Vijfhuizen, Boukje de Vries, Michel D Ferrari, Peter A C 't Hoen, Gisela M Terwindt, Arn M J M van den Maagdenberg
Cluster headache is a relatively rare headache disorder, typically characterized by multiple daily, short-lasting attacks of excruciating, unilateral (peri-)orbital or temporal pain associated with autonomic symptoms and restlessness. To better understand the pathophysiology of cluster headache, we used RNA sequencing to identify differentially expressed genes and pathways in whole blood of patients with episodic (n = 19) or chronic (n = 20) cluster headache in comparison with headache-free controls (n = 20)...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28074534/depolarizing-gaba-contributes-to-glutamatergic-network-rewiring-in-epilepsy
#4
Nazim Kourdougli, Christophe Pellegrino, Juho-Matti Renko, Stanislav Khirug, Geneviève Chazal, Tiina-Kaisa Kukko-Lukjanov, Sari E Lauri, Jean-Luc Gaiarsa, Liang Zhou, Angélique Peret, Eero Castrén, Raimo Kalevi Tuominen, Valérie Crépel, Claudio Rivera
OBJECTIVE: Rewiring of excitatory glutamatergic neuronal circuits is a major abnormality in epilepsy. Besides the rewiring of excitatory circuit, an abnormal depolarizing GABAergic drive has been hypothesized to participate in the epileptogenic processes. However, a remaining clinically relevant question is whether early post Status Epilepticus (SE) evoked chloride dysregulation is important for the remodeling of aberrant glutamatergic neuronal circuit. METHODS: Osmotic mini-pumps were used to infuse intracerebrally a specific inhibitor of depolarizing GABAergic transmission as well as a functionally blocking antibody towards the pan-neurotrophin receptor p75 (p75(NTR) )...
January 11, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28073605/comprehensive-association-analysis-of-27-genes-from-the-gabaergic-system-in-japanese-individuals-affected-with-schizophrenia
#5
Shabeesh Balan, Kazuo Yamada, Yoshimi Iwayama, Takanori Hashimoto, Tomoko Toyota, Chie Shimamoto, Motoko Maekawa, Shu Takagai, Tomoyasu Wakuda, Yosuke Kameno, Daisuke Kurita, Kohei Yamada, Mitsuru Kikuchi, Tasuku Hashimoto, Nobuhisa Kanahara, Takeo Yoshikawa
Involvement of the gamma-aminobutyric acid (GABA)-ergic system in schizophrenia pathogenesis through disrupted neurodevelopment has been highlighted in numerous studies. However, the function of common genetic variants of this system in determining schizophrenia risk is unknown. We therefore tested the association of 375 tagged SNPs in genes derived from the GABAergic system, such as GABAA receptor subunit genes, and GABA related genes (glutamate decarboxylase genes, GABAergic-marker gene, genes involved in GABA receptor trafficking and scaffolding) in Japanese schizophrenia case-control samples (n=2926; 1415 cases and 1511 controls)...
January 7, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28071892/transient-adenosine-release-is-modulated-by-nmda-and-gabab-receptors
#6
Michael D Nguyen, Ying Wang, Mallikarjunarao Ganesana, B Jill Venton
Adenosine is a neuroprotective agent that modulates neurotransmission and is modulated by other neurotransmitters. Spontaneous, transient adenosine is a recently discovered mode of signaling where adenosine is released and cleared from the extracellular space quickly, in less than three seconds. Spontaneous adenosine release is regulated by adenosine A1 and A2a receptors, but regulation by other neurotransmitter receptors has not been studied. Here, we examined the effect of glutamate and GABA receptors on the concentration and frequency of spontaneous, transient adenosine release by measuring adenosine with fast-scan cyclic voltammetry in the rat caudate-putamen...
January 10, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28069927/impact-of-altered-cholinergic-tones-on-the-neurovascular-coupling-response-to-whisker-stimulation
#7
Clotilde Lecrux, Claire H Sandoe, Sujaya Neupane, Pascal Kropf, Xavier Toussay, Xin-Kang Tong, María Lacalle-Aurioles, Amir Shmuel, Edith Hamel
Brain imaging techniques that use vascular signals to map changes in neuronal activity rely on the coupling between electrophysiology and hemodynamics, a phenomenon referred to "neurovascular coupling" (NVC). It is unknown whether this relationship remains reliable under altered brain states associated to acetylcholine (ACh) levels, such as attention and arousal, and in pathological conditions like Alzheimer's disease. We therefore assessed the effects of varying ACh tone on whisker evoked-NVC responses in rat barrel cortex, measured by cerebral blood flow (CBF) and neurophysiological recordings (local field potentials, LFPs)...
January 9, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28068943/a-case-of-gabar-antibodies-in-schizophrenia
#8
Ida S Haussleiter, Klaus-Peter Wandinger, Georg Juckel
BACKGROUND: In the last couple of years, schizophrenia was often discussed as autoimmune disease. Several antibodies were suspected, but so far there has been no proof of Gamma-aminobutyric acid (GABA) receptor antibodies in patients with schizophrenia. CASE PRESENTATION: In this case report we present a 21-year old woman with schizophrenic symptoms, who showed anti-GABAB1 antibodies when screened by a vast recombinant neurology mosaic on Human Embryonic Kidney Cells 293 (HEK293) cells...
January 10, 2017: BMC Psychiatry
https://www.readbyqxmd.com/read/28066142/participation-of-central-gabaa-receptors-in-the-trigeminal-processing-of-mechanical-allodynia-in-rats
#9
Min Ji Kim, Young Hong Park, Kui Ye Yang, Jin Sook Ju, Yong Chul Bae, Seong Kyu Han, Dong Kuk Ahn
Here we investigated the central processing mechanisms of mechanical allodynia and found a direct excitatory link with low-threshold input to nociceptive neurons. Experiments were performed on male Sprague-Dawley rats weighing 230-280 g. Subcutaneous injection of interleukin 1 beta (IL-1β) (1 ng/10 µL) was used to produce mechanical allodynia and thermal hyperalgesia. Intracisternal administration of bicuculline, a gamma aminobutyric acid A (GABAA) receptor antagonist, produced mechanical allodynia in the orofacial area under normal conditions...
January 2017: Korean Journal of Physiology & Pharmacology
https://www.readbyqxmd.com/read/28065797/characterising-the-developmental-profile-of-hesc-derived-medium-spiny-neuron-progenitors-and-assessing-mature-neuron-function-using-a-crispr-generated-human-darpp-32-wt-egfp-amp-reporter-line
#10
C P J Hunt, C W Pouton, J M Haynes
In the developing ventral telencephalon, cells of the lateral ganglionic eminence (LGE) give rise to all medium spiny neurons (MSNs). This development occurs in response to a highly orchestrated series of morphogenetic stimuli that pattern the resultant neurons as they develop. Striatal MSNs are characterised by expression of dopamine receptors, dopamine-and cyclic AMP-regulated phosphoprotein (DARPP32) and the neurotransmitter GABA. In this study, we demonstrate that fine tuning WNT and SHH signaling early in human embryonic stem cell differentiation can induce a subpallial progenitor molecular profile...
January 5, 2017: Neurochemistry International
https://www.readbyqxmd.com/read/28063882/mice-lacking-grip1-2-show-increased-social-interactions-and-enhanced-phosphorylation-at-glua2-s880
#11
Mei Han, Rebeca Mejias, Shu-Ling Chiu, Rebecca Rose, Abby Adamczyk, Richard Huganir, Tao Wang
Glutamate receptor interacting proteins 1 and 2 (GRIP1/2) play an important role in regulating synaptic trafficking of AMPA receptor 2/3 (GluA2/3) and synaptic strength. Gain-of-function GRIP1 mutations are implicated in social behavioral deficits in autism. To study mechanisms of Grip1/2-mediated AMPA signaling in the regulation of social behaviors, we performed social behavioral testing on neuron-specific Grip1/2-double knockout (DKO) and wild type (WT) mice that are matched for age, sex, and strain background...
January 4, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28053242/nitric-oxide-promotes-gaba-release-by-activating-a-voltage-independent-ca2-influx-pathway-in-retinal-amacrine-cells
#12
John Wesley Maddox, Evanna L Gleason
Retinal amacrine cells express nitric oxide synthase and produce nitric oxide (NO), making NO available to regulate the function of amacrine cells. Here, we test the hypothesis that NO can alter the GABAergic synaptic output of amacrine cells. We investigate this using whole-cell voltage clamp recordings and Ca(2+) imaging of cultured chick retinal amacrine cells. When recording from amacrine cells receiving synaptic input from other amacrine cells, we find that NO increases GABAergic spontaneous postsynaptic current (sPSC) frequency...
January 4, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28053010/mutations-in-gabrb3-from-febrile-seizures-to-epileptic-encephalopathies
#13
Rikke S Møller, Thomas V Wuttke, Ingo Helbig, Carla Marini, Katrine M Johannesen, Eva H Brilstra, Ulvi Vaher, Ingo Borggraefe, Inga Talvik, Tiina Talvik, Gerhard Kluger, Laurence L Francois, Gaetan Lesca, Julitta de Bellescize, Susanne Blichfeldt, Nicolas Chatron, Nils Holert, Julia Jacobs, Marielle Swinkels, Cornelia Betzler, Steffen Syrbe, Marina Nikanorova, Candace T Myers, Line H G Larsen, Sabina Vejzovic, Manuela Pendziwiat, Sarah von Spiczak, Sarah Hopkins, Holly Dubbs, Yuan Mang, Konstantin Mukhin, Hans Holthausen, Koen L van Gassen, Hans A Dahl, Niels Tommerup, Heather C Mefford, Guido Rubboli, Renzo Guerrini, Johannes R Lemke, Holger Lerche, Hiltrud Muhle, Snezana Maljevic
OBJECTIVE: To examine the role of mutations in GABRB3 encoding the β3 subunit of the GABAA receptor in individual patients with epilepsy with regard to causality, the spectrum of genetic variants, their pathophysiology, and associated phenotypes. METHODS: We performed massive parallel sequencing of GABRB3 in 416 patients with a range of epileptic encephalopathies and childhood-onset epilepsies and recruited additional patients with epilepsy with GABRB3 mutations from other research and diagnostic programs...
January 4, 2017: Neurology
https://www.readbyqxmd.com/read/28040450/cortical-inhibitory-and-excitatory-function-in-drug-naive-generalized-anxiety-disorder
#14
Cheng-Ta Li, Chia-Feng Lu, Hui-Ching Lin, Ying-Zu Huang, Chi-Hung Juan, Tung-Ping Su, Ya-Mei Bai, Mu-Hong Chen, Wei-Chen Lin
BACKGROUND: A growing body of evidence suggests that deficits in GABAergic inhibitory and glutamatergic excitatory neurotransmission may be involved in the core pathophysiology of generalized anxiety disorder (GAD), a disease characterized by pathological anxious worrying. The aim of the present study was to measure motor cortical excitability by paired-pulse transcranial magnetic stimulation (ppTMS) in patients with GAD. METHODS: ppTMS measurements of excitation and inhibition from bilateral motor cortices were investigated in 26 right-handed GAD patients who were drug-naïve (half of them with a comorbidity of major depressive disorder) and 35 right-handed age- and sex-matched healthy controls...
December 21, 2016: Brain Stimulation
https://www.readbyqxmd.com/read/28039192/orexin-signaling-in-rostral-lateral-hypothalamus-and-nucleus-accumbens-shell-in-the-control-of-spontaneous-physical-activity-in-high-and-low-activity-rats
#15
Claudio Esteban Perez-Leighton, Morgan R Little, Martha K Grace, Charles J Billington, Catherine M Kotz
Spontaneous physical activity (SPA) describes activity outside of formal exercise and shows large inter-individual variability. The hypothalamic orexin/hypocretin peptides are key regulators of SPA. Orexins drive SPA within multiple brain sites, including rostral lateral hypothalamus (LH) and nucleus accumbens shell (NAcSh). Rats with high basal SPA (high activity, HA) show higher orexin mRNA expression and SPA after injection of orexin-A in rostral LH compared to low activity (LA) rats. Here we explored the contribution of orexin signaling in rostral LH and NAcSh to the HA/LA phenotype...
December 30, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28038985/exploring-the-mechanism-by-which-accumbal-deep-brain-stimulation-attenuates-morphine-induced-reinstatement-through-manganese-enhanced-mri-and-pharmacological-intervention
#16
Lei Zhang, Ying Cui, Ying-Chun Wang, Hong Yin, Jian-Min Zheng, Lu Huang, Zhen-Wei Zhao, Jiang Li
Deep brain stimulation (DBS) of the nucleus accumbens (NAc) has been applied to attenuate drug relapses in animal studies and clinical treatments. However, the mechanisms by which DBS produces its therapeutic effects remain largely unknown. This study is the first to combine manganese-enhanced magnetic resonance imaging (MRI) with DBS to explore the effects of accumbal DBS on the relapse pathway of rats. The images suggested that DBS produced an antidromic activation of the cortico-accumbal afferents. To verify the activating effects of DBS, the expression levels of the protein encoded by the immediate early gene c-Fos following DBS were measured using immunochemical methods...
December 27, 2016: Experimental Neurology
https://www.readbyqxmd.com/read/28035673/somatic-and-neuritic-spines-on-tyrosine-hydroxylase-immunopositive-cells-of-rat-retina
#17
Anna Fasoli, James Dang, Aaron H Gouw, Jeffrey S Johnson, Alex Fogli Iseppe, Andrew T Ishida
Dopamine- and tyrosine hydroxylase-immunopositive cells (TH cells) modulate visually driven signals as they flow through retinal photoreceptor, bipolar, and ganglion cells. Previous studies suggested that TH cells release dopamine from varicose axons arborizing in the inner and outer plexiform layers after glutamatergic synapses depolarize TH cell dendrites in the inner plexiform layer and these depolarizations propagate to the varicosities. Although it has been proposed that these excitatory synapses are formed onto appendages resembling dendritic spines, spines have not been found on TH cells of most species examined to date or on TH cell somata which release dopamine when exposed to glutamate receptor agonists...
December 30, 2016: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28031402/presynaptic-gain-control-by-endogenous-cotransmission-of-dopamine-and-gaba-in-the-olfactory-bulb
#18
Christopher E Vaaga, Jordan T Yorgason, John T Williams, Gary L Westbrook
In the olfactory bulb, lateral inhibition mediated by local juxtaglomerular interneurons has been proposed as a gain control mechanism, important for de-correlating odorant responses. Among juxtaglomerular interneurons, short axon cells are unique as dual-transmitter neurons that release dopamine and GABA. To examine their intraglomerular function, we expressed channelrhodopsin under control of the DAT-cre promoter, and activated olfactory afferents within individual glomeruli. Optical stimulation of labeled cells triggered endogenous dopamine release as measured by cyclic voltammetry, and GABA release as measured by whole-cell GABAA receptor currents...
December 28, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28025973/lateral-habenula-involvement-in-impulsive-cocaine-seeking
#19
Agustin Zapata, Eun-Kyung Hwang, Carl R Lupica
The Lateral Habenula (LHb) is a brain structure receiving inputs from limbic forebrain areas and innervating major midbrain monoaminergic nuclei. Evidence indicates LHb involvement in sleep control, reward-based decision making, avoidance of punishment, and responses to stress. Additional work has established that the LHb mediates negative feedback in response to aversive events. Since a hallmark of drug addiction is the inability to limit drug use despite negative consequences, we hypothesize that LHb dysfunction may play a role in the lack of control over drug seeking...
December 27, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28017666/gaba-australis-some-reflections-on-the-history-of-gaba-receptor-research-in-australia
#20
Graham A R Johnston
Research on GABA receptors has a long history in Australia dating from 1958 with David Curtis and his colleagues in Canberra. This review traces many of the advances made in Australia guided by highly cited publications and some obscure ones. It covers the discovery of key chemicals with which to investigate GABA receptor function including bicuculline, muscimol, phaclofen, THIP and (+)-CAMP. Also described are findings relevant to the involvement of mutant GABA receptors in inherited epilepsy. The modulation of GABA receptors by a bewildering range of chemicals, especially by flavonoids and terpenoids, is discussed...
December 22, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
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