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https://www.readbyqxmd.com/read/29792869/preferential-inputs-from-cholecystokinin-positive-neurons-to-the-somatic-compartment-of-parvalbumin-expressing-neurons-in-the-mouse-primary-somatosensory-cortex
#1
Hiroyuki Hioki, Jaerin Sohn, Hisashi Nakamura, Shinichiro Okamoto, Jungwon Hwang, Yoko Ishida, Megumu Takahashi, Hiroshi Kameda
Parvalbumin-positive (PV+) neurons in the cerebral cortex, mostly corresponding to fast-spiking basket cells, have been implicated in higher-order brain functions and psychiatric disorders. We previously demonstrated that the somatic compartment of PV+ neurons received inhibitory inputs mainly from vasoactive intestinal polypeptide (VIP)+ neurons, whereas inhibitory inputs to the dendritic compartment were derived mostly from PV+ and somatostatin (SOM)+ neurons. However, a substantial number of the axosomatic inputs have remained unidentified...
May 21, 2018: Brain Research
https://www.readbyqxmd.com/read/29792150/synthesis-and-biological-evaluation-of-novel-2-3-disubstituted-benzofuran-analogues-of-gaba-as-neurotropic-agents
#2
Arturo Coaviche-Yoval, Hector Luna, Ricardo Tovar-Miranda, Marvin Antonio Soriano-Ursua, Jose G Trujillo-Ferrara
BACKGROUND: Benzofurans are heterocyclic compounds with neurotropic activity. Some have been developed for the treatment of acute and degenerative neuronal injuries. OBJECTIVE: To evaluate the in silico binding of some promising benzofurans on the GABA receptors, and the in vivo neurotropic activity of benzofuran analogues (BZF 6-10) of gamma-aminobutyric acid (GABA) on a seizure model. METHODS: The ligands with the best physicochemical attributes were docked on two GABA receptors (the alpha-1 subunit of GABAA-R and GBR1 subunit of GABAB-R)...
May 23, 2018: Medicinal Chemistry
https://www.readbyqxmd.com/read/29789374/identification-and-characterization-of-a-novel-spontaneously-active-bursty-gabaergic-interneuron-in-the-mouse-striatum
#3
Maxime Assous, Thomas W Faust, Robert Assini, Fulva Shah, Yacouba Sidibe, James M Tepper
The recent availability of different transgenic mouse lines coupled with other modern molecular techniques has led to the discovery of an unexpectedly large cellular diversity and synaptic specificity in striatal interneuronal circuitry. Prior research has described three spontaneously active interneuron types in mouse striatal slices; the cholinergic interneuron, the neuropeptide Y-low threshold spike interneuron, and the tyrosine hydroxylase interneurons (THINs). Using transgenic Htr3a-Cre mice we now characterize a fourth population of spontaneously active striatal GABAergic interneurons termed spontaneously active bursty interneurons (SABI) because of their unique burst-firing pattern in cell-attached recordings...
May 22, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29788232/chronic-stress-exposure-reduces-parvalbumin-expression-in-the-rat-hippocampus-through-an-imbalance-of-redox-mechanisms-restorative-effect-of-the-antipsychotic-lurasidone
#4
Andrea C Rossetti, Maria Serena Paladini, Martina Colombo, Piotr Gruca, Magdalena Lason-Tyburkiewicz, Katarzyna Tota-Glowczyk, Mariusz Papp, Marco A Riva, Raffaella Molteni
Background: Psychiatric disorders are associated with altered function of inhibitory neurotransmission within the limbic system, which may be due to the vulnerability of selective neuronal subtypes to challenging environmental conditions, such as stress. In this context, parvalbumin (PVB) positive GABAergic interneurons, which are critically involved in processing complex cognitive tasks, are particularly vulnerable to stress exposure, an effect that may be the consequence of dysregulated redox mechanisms...
May 18, 2018: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29788228/correct-laminar-positioning-in-the-neocortex-influences-proper-dendritic-and-synaptic-development
#5
Fanny Sandrine Martineau, Surajit Sahu, Vanessa Plantier, Emmanuelle Buhler, Fabienne Schaller, Lauriane Fournier, Geneviève Chazal, Hiroshi Kawasaki, Alfonso Represa, Françoise Watrin, Jean-Bernard Manent
The neocortex is a 6-layered laminated structure with a precise anatomical and functional organization ensuring proper function. Laminar positioning of cortical neurons, as determined by termination of neuronal migration, is a key determinant of their ability to assemble into functional circuits. However, the exact contribution of laminar placement to dendrite morphogenesis and synapse formation remains unclear. Here we manipulated the laminar position of cortical neurons by knocking down doublecortin (Dcx), a crucial effector of migration, and show that misplaced neurons fail to properly form dendrites, spines, and functional glutamatergic and GABAergic synapses...
May 18, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29787738/altered-brain-activity-during-withdrawal-from-chronic-alcohol-is-associated-with-changes-in-il-6-signal-transduction-and-gabaergic-mechanisms-in-transgenic-mice-with-increased-astrocyte-expression-of-il-6
#6
Donna L Gruol, Salvador Huitron-Resendiz, Amanda J Roberts
Interleukin-6 (IL-6) is an important neuroimmune factor that is increased in the brain by alcohol exposure/withdrawal and is thought to play a role in the actions of alcohol on the brain. To gain insight into IL-6/alcohol/withdrawal interactions and how these interactions affect the brain, we are studying the effects of chronic binge alcohol exposure on transgenic mice that express elevated levels of IL-6 in the brain due to increased astrocyte expression (IL-6 tg) and their non-transgenic (non-tg) littermate controls...
May 19, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29786085/chronic-crh-depletion-from-gabaergic-long-range-projection-neurons-in-the-extended-amygdala-reduces-dopamine-release-and-increases-anxiety
#7
Nina Dedic, Claudia Kühne, Mira Jakovcevski, Jakob Hartmann, Andreas J Genewsky, Karina S Gomes, Elmira Anderzhanova, Max L Pöhlmann, Simon Chang, Adam Kolarz, Annette M Vogl, Julien Dine, Michael W Metzger, Bianca Schmid, Rafael C Almada, Kerry J Ressler, Carsten T Wotjak, Valery Grinevich, Alon Chen, Mathias V Schmidt, Wolfgang Wurst, Damian Refojo, Jan M Deussing
The interplay between corticotropin-releasing hormone (CRH) and the dopaminergic system has predominantly been studied in addiction and reward, while CRH-dopamine interactions in anxiety are scarcely understood. We describe a new population of CRH-expressing, GABAergic, long-range-projecting neurons in the extended amygdala that innervate the ventral tegmental area and alter anxiety following chronic CRH depletion. These neurons are part of a distinct CRH circuit that acts anxiolytically by positively modulating dopamine release...
May 21, 2018: Nature Neuroscience
https://www.readbyqxmd.com/read/29786081/distinct-learning-induced-changes-in-stimulus-selectivity-and-interactions-of-gabaergic-interneuron-classes-in-visual-cortex
#8
Adil G Khan, Jasper Poort, Angus Chadwick, Antonin Blot, Maneesh Sahani, Thomas D Mrsic-Flogel, Sonja B Hofer
How learning enhances neural representations for behaviorally relevant stimuli via activity changes of cortical cell types remains unclear. We simultaneously imaged responses of pyramidal cells (PYR) along with parvalbumin (PV), somatostatin (SOM), and vasoactive intestinal peptide (VIP) inhibitory interneurons in primary visual cortex while mice learned to discriminate visual patterns. Learning increased selectivity for task-relevant stimuli of PYR, PV and SOM subsets but not VIP cells. Strikingly, PV neurons became as selective as PYR cells, and their functional interactions reorganized, leading to the emergence of stimulus-selective PYR-PV ensembles...
May 21, 2018: Nature Neuroscience
https://www.readbyqxmd.com/read/29782905/pathology-of-nnos-expressing-gabaergic-neurons-in-mouse-model-of-alzheimer-s-disease
#9
Seungho Choi, Je-Seong Won, Steven L Carroll, Balasubramaniam Annamalai, Inderjit Singh, Avtar K Singh
Alzheimer's disease (AD) is the most common form of dementia that is often accompanied by mood and emotional disturbances and seizures. There is growing body of evidence that neurons expressing γ-aminobutyric acid (GABA) play an important role in regulation of cognition, mood, and emotion as well as seizure susceptibility, but participation of GABAergic neuronal pathology in Alzheimer's disease (AD) is not understood well at present. Here, we report that transgenic mice expressing human amyloid precursor protein Swedish-Deutch-Iowa mutant (APPSweDI ) exhibit early loss of neurons expressing GAD67, a GABA synthesizing enzyme, in advance to the loss of pyramidal neurons in hippocampal CA1 region...
May 18, 2018: Neuroscience
https://www.readbyqxmd.com/read/29782876/chloride-cotransporter-kcc2-is-essential-for-gabaergic-inhibition-in-the-scn
#10
A H O Olde Engberink, J H Meijer, S Michel
One of the principal neurotransmitters of the central nervous system is GABA. In the adult brain, GABA is predominantly inhibitory, but there is growing evidence indicating that GABA can shift to excitatory action depending on environmental conditions. In the mammalian central circadian clock of the suprachiasmatic nucleus (SCN) GABAergic activity shifts from inhibition to excitation when animals are exposed to long day photoperiod. The polarity of the GABAergic response (inhibitory versus excitatory) depends on the GABA equilibrium potential determined by the intracellular Cl- concentration ([Cl- ]i )...
May 18, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29781223/delayed-injury-of-hippocampal-interneurons-after-neonatal-hypoxia-ischemia-and-therapeutic-hypothermia-in-a-murine-model
#11
Raul Chavez-Valdez, Paul Emerson, Janasha Goffigan-Holmes, Alfredo Kirkwood, Lee J Martin, Frances J Northington
Delayed hippocampal injury and memory impairments follow neonatal hypoxia-ischemia (HI) despite the use of therapeutic hypothermia (TH). Death of hippocampal pyramidal cells occurs acutely after HI, but characterization of delayed cell death and injury of interneurons (INs) is unknown. We hypothesize that injury of INs after HI is: i) asynchronous to that of pyramidal cells, ii) independent of injury severity, and iii) unresponsive to TH. HI was induced in C57BL6 mice at p10 with unilateral right carotid ligation and 45 min of hypoxia (FiO2 =0...
May 21, 2018: Hippocampus
https://www.readbyqxmd.com/read/29780307/parvalbumin-and-gaba-microcircuits-in-the-mouse-superior-colliculus
#12
Claudio A Villalobos, Qiong Wu, Psyche H Lee, Paul J May, Michele A Basso
The mammalian superior colliculus (SC) is a sensorimotor midbrain structure responsible for orienting behaviors. Although many SC features are known, details of its intrinsic microcircuits are lacking. We used transgenic mice expressing reporter genes in parvalbumin-positive (PV+ ) and gamma aminobutyric acid-positive (GABA+ ) neurons to test the hypothesis that PV+ neurons co-localize GABA and form inhibitory circuits within the SC. We found more PV+ neurons in the superficial compared to the intermediate SC, although a larger percentage of PV+ neurons co-expressed GABA in the latter...
2018: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/29779874/a-gabaergic-feedback-shapes-dopaminergic-input-on-the-drosophila-mushroom-body-to-promote-appetitive-long-term-memory
#13
Alice Pavlowsky, Johann Schor, Pierre-Yves Plaçais, Thomas Preat
Memory consolidation is a crucial step for long-term memory (LTM) storage. However, we still lack a clear picture of how memory consolidation is regulated at the neuronal circuit level. Here, we took advantage of the well-described anatomy of the Drosophila olfactory memory center, the mushroom body (MB), to address this question in the context of appetitive LTM. The MB lobes, which are made by the fascicled axons of the MB intrinsic neurons, are organized into discrete anatomical modules, each covered by the terminals of a defined type of dopaminergic neuron (DAN) and the dendrites of a corresponding type of MB output neuron (MBON)...
May 9, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29776968/liraglutide-modulates-appetite-and-body-weight-via-glp-1r-expressing-glutamatergic-neurons
#14
Jessica M Adams, Hongjuan Pei, Darleen A Sandoval, Randy J Seeley, Rui B Chang, Stephen D Liberles, David P Olson
Glucagon-like peptide-1 receptor (GLP-1R) agonists are FDA-approved weight loss drugs. Despite their widespread use, the sites of action through which GLP-1R agonists (GLP1RAs) impact appetite and body weight are still not fully understood. Here, we determined whether GLP-1Rs in either GABAergic or glutamatergic neurons are necessary for the acute and chronic effects of the GLP1RA liraglutide on food intake, visceral illness, body weight and neural network activation. We found that mice lacking GLP-1Rs in vGAT -expressing GABAergic neurons responded identically to controls in all parameters measured, whereas deletion of GLP-1Rs in vGlut2 -expressing glutamatergic neurons eliminated liraglutide-induced weight loss and visceral illness and severely attenuated its effects on feeding...
May 18, 2018: Diabetes
https://www.readbyqxmd.com/read/29776015/delta-9-tetrahydrocannabinol-potentiates-fear-memory-salience-through-functional-modulation-of-mesolimbic-dopaminergic-activity-states
#15
Aurelie Fitoussi, Jordan Zunder, Huibing Tan, Steven R Laviolette
Chronic or acute exposure to delta-9-tetrahydrocannabinol (THC), the main psychoactive compound in cannabis, has been associated with numerous neuropsychiatric side-effects, including dysregulation of emotional processing and associative memory formation. Clinical and pre-clinical evidence suggests that the effects of THC are due to the ability to modulate mesolimbic dopamine (DA) activity states in the nucleus accumbens (NAc) and ventral tegmental area (VTA). Nevertheless, the mechanisms by which THC modulates mesolimbic DA function and emotional processing are not well understood...
May 18, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29775659/%C3%AE-2-receptors-in-the-lateral-parabrachial-nucleus-generates-the-pressor-response-of-the-cardiovascular-chemoreflex-effects-of-gaba-a-receptor
#16
Nafiseh Mirzaei Damabi, Gholam Reza Namvar, Fahimeh Yeganeh, Masoumeh Hatam
The lateral parabrachial nucleus (LPBN) is a pontine area involved in cardiovascular chemoreflex. This study was performed to find the effects of reversible synaptic blockade of the LPBN on the chemoreflex responses, and to find the roles of GABAA receptor and α2 -adenoreceptor (α2 -AR) in chemoreflex. It also aimed to seek possible interaction between GABA and noradrenergic systems of the LPBN in urethane-anesthetized male rats. Cardiovascular chemoreflex was activated by intravenous injection of potassium cyanide (KCN, 80 μg/kg)...
May 15, 2018: Brain Research Bulletin
https://www.readbyqxmd.com/read/29774754/effect-of-di-2-ethylhexyl-phthalate-on-the-neuroendocrine-regulation-of-reproduction-in-adult-male-rats-and-its-relationship-to-anxiogenic-behavior-participation-of-gabaergic-system
#17
S Carbone, O J Ponzo, N Gobetto, Y A Samaniego, R Reynoso, J A Moguilevsky, R A Cutrera
The endocrine disruptor di-(2-ethylhexyl) phthalate (DEHP) is used in a variety of consumer products made with polyvinyl chloride and also in the manufacture of medical devices. DEHP disrupts reproductive tract development in an antiandrogenic manner and also may induce neurobehavioral changes. The aim of this study was to investigate the effects of chronic postnatal exposure to DEHP (30 mg/kg body weight/day, orally from birth to day 60) on the neuroendocrine regulation of the gonadal axis and its impact on the anxiety-like behavior in adult male rats, as well as the probable participation of the GABAergic system in these effects...
January 1, 2018: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/29771287/term-or-preterm-cesarean-section-delivery-does-not-lead-to-long-term-detrimental-consequences-in-mice
#18
Morgane Chiesa, Damien Guimond, Roman Tyzio, Alexandre Pons-Bennaceur, Natalia Lozovaya, Nail Burnashev, Diana C Ferrari, Yehezkel Ben-Ari
Epidemiological studies have provided contradictory data on the deleterious sequels of cesarean section (C-section) delivery and their links with developmental brain disorders such as Autism Spectrum Disorders. To gain better insight on these issues, we have now compared physiological, morphological, and behavioral parameters in vaginal, term, and preterm C-section delivered mice. We report that C-section delivery does not lead to long-term behavioral alterations though preterm C-section delivery modifies communicative behaviors in pups...
May 16, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29766458/cerebellar-stimulation-evoked-prefrontal-electrical-synchrony-is-modulated-by-gaba
#19
Xiaoming Du, Laura M Rowland, Ann Summerfelt, Fow-Sen Choa, George F Wittenberg, Krista Wisner, Andrea Wijtenburg, Joshua Chiappelli, Peter Kochunov, L Elliot Hong
Cerebellar-prefrontal connectivity has been recognized as important for behaviors ranging from motor coordination to cognition. Many of these behaviors are known to involve excitatory or inhibitory modulations from the prefrontal cortex. We used cerebellar transcranial magnetic stimulation (TMS) with simultaneous electroencephalography (EEG) to probe cerebellar-evoked electrical activity in prefrontal cortical areas and used magnetic resonance spectroscopy (MRS) measures of prefrontal GABA and glutamate levels to determine if they are correlated with those potentials...
May 15, 2018: Cerebellum
https://www.readbyqxmd.com/read/29765304/chloride-homeostasis-in-neurons-with-special-emphasis-on-the-olivocerebellar-system-differential-roles-for-transporters-and-channels
#20
REVIEW
Negah Rahmati, Freek E Hoebeek, Saša Peter, Chris I De Zeeuw
The intraneuronal ionic composition is an important determinant of brain functioning. There is growing evidence that aberrant homeostasis of the intracellular concentration of Cl- ([Cl- ]i ) evokes, in addition to that of Na+ and Ca2+ , robust impairments of neuronal excitability and neurotransmission and thereby neurological conditions. More specifically, understanding the mechanisms underlying regulation of [Cl- ]i is crucial for deciphering the variability in GABAergic and glycinergic signaling of neurons, in both health and disease...
2018: Frontiers in Cellular Neuroscience
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