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GABAergic neurons

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https://www.readbyqxmd.com/read/29346754/input-specific-nmdar-dependent-potentiation-of-dendritic-gabaergic-inhibition
#1
Chiayu Q Chiu, James S Martenson, Maya Yamazaki, Rie Natsume, Kenji Sakimura, Susumu Tomita, Steven J Tavalin, Michael J Higley
Preservation of a balance between synaptic excitation and inhibition is critical for normal brain function. A number of homeostatic cellular mechanisms have been suggested to play a role in maintaining this balance, including long-term plasticity of GABAergic inhibitory synapses. Many previous studies have demonstrated a coupling of postsynaptic spiking with modification of perisomatic inhibition. Here, we demonstrate that activation of NMDA-type glutamate receptors leads to input-specific long-term potentiation of dendritic inhibition mediated by somatostatin-expressing interneurons...
January 17, 2018: Neuron
https://www.readbyqxmd.com/read/29346425/hippocampal-corticotropin-releasing-hormone-neurons-support-recognition-memory-and-modulate-hippocampal-excitability
#2
Andrew Hooper, Patrick M Fuller, Jamie Maguire
Corticotropin-releasing hormone (CRH) signaling in the hippocampus has been established to be important for mediating the effects of stress on learning and memory. Given our laboratory's recent characterization of a subset of hippocampal CRH neurons as a novel class of GABAergic interneurons, we hypothesized that these local GABAergic hippocampal CRH neurons may influence hippocampal function. Here we applied an array of molecular tools to selectively label and manipulate hippocampal CRH neurons in mice, in order to assess this interneuron population's impact on hippocampus-dependent behaviors and hippocampal network excitability...
2018: PloS One
https://www.readbyqxmd.com/read/29345055/npas4-deficiency-interacts-with-adolescent-stress-to-disrupt-prefrontal-gabaergic-maturation-and-adult-cognitive-flexibility
#3
Chloe Page, Jonathan Alexander, Ryan Shepard, Laurence Coutellier
Healthy cognitive and emotional functioning relies on a balance between excitatory and inhibitory neurotransmission in the prefrontal cortex. This balance is largely established during early postnatal and adolescent developmental periods by maturation of the γ-aminobutyric acid (GABA) system, including increased density of parvalbumin cells and perineuronal nets. Genetic and/or environmental factors during adolescence can disrupt GABAergic maturation and lead to behavioral dysfunction in adulthood. The present study examined the interaction between chronic mild stress during adolescence and genetic deficiency of neuronal PAS domain 4 (Npas4), a brain-specific transcription factor that regulates inhibitory neurotransmission and that contributes to adolescent prefrontal GABAergic maturation...
January 18, 2018: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/29339464/propionate-enters-gabaergic-neurons-inhibits-gaba-transaminase-causes-gaba-accumulation-and-lethargy-in-a-model-of-propionic-acidemia
#4
Cecilie Morland, Anne-Sofie Frøland, Mi Nyguyen Pettersen, Jon Storm-Mathisen, Vidar Gundersen, Frode Rise, Bjørnar Hassel
Propionic acidemia is the accumulation of propionate in blood due to dysfunction of propionyl-CoA carboxylase. The condition causes lethargy and striatal degeneration with motor impairment in humans. How propionate exerts its toxic effect is unclear. Here we show that intravenous administration of propionate causes dose-dependent propionate accumulation in the brain and transient lethargy in mice. Propionate, an inhibitor of histone deacetylase, entered GABAergic neurons, as could be seen from increased neuronal histone H4 acetylation in striatum and neocortex...
January 16, 2018: Biochemical Journal
https://www.readbyqxmd.com/read/29339324/oscillatory-synchronous-inhibition-in-the-basolateral-amygdala-and-its-primary-dependence-on-nr2a-containing-nmda-receptors
#5
Vassiliki Aroniadou-Anderjaska, Volodymyr I Pidoplichko, Taiza H Figueiredo, Maria F M Braga
Synchronous, rhythmic firing of GABAergic interneurons is a fundamental mechanism underlying the generation of brain oscillations, and evidence suggests that NMDA receptors (NMDARs) play a key role in oscillatory activity by regulating the activity of interneurons. Consistent with this, derangement of brain rhythms in certain neuropsychiatric disorders, notably schizophrenia and autism, is associated with NMDAR hypofunction and loss of inhibitory interneurons. In the basolateral amygdala (BLA)-dysfunction of which is involved in a host of neuropsychiatric diseases-, principal neurons display spontaneous, rhythmic "bursts" of inhibitory activity, which could potentially be involved in the orchestration of oscillations in the BLA network; here, we investigated the role of NMDARs in these inhibitory oscillations...
January 12, 2018: Neuroscience
https://www.readbyqxmd.com/read/29330035/harmine-enhances-gabaergic-transmission-onto-basoamygdala-projection-neurons-in-mice
#6
Wei-Zhu Liu, Bo-Wei Huang, Wen-Jie You, Ping Hu, Xue-Hui Wang, Jun-Yu Zhang, Xiao-Bin Xu, Zong-Yong Zhang, Bing-Xing Pan, Wen-Hua Zhang
Emerging evidence indicates that loss of inhibitory tone in amygdala with its subsequent overactivation contributes to the development of multiple mental disorders such as anxiety disorders and post-traumatic stress disorder (PTSD). Harmine is a member of natural β-carboline alkaloids which can readily cross the blood brain barrier and displays significant antidepressant and anxiolytic effects in rodents. However, the underlying neurobiological mechanisms are largely unknown. Here, by using whole-cell patch clamp recordings in in vitro amygdala slices, we examined the effect of harmine on glutamatergic and GABAergic transmission onto basal amygdala (BA) projection neurons (PNs)...
January 9, 2018: Brain Research Bulletin
https://www.readbyqxmd.com/read/29329911/mrna-expression-and-metabolic-regulation-of-npy-and-agrp1-2-in-the-zebrafish-brain
#7
Inyoung Jeong, Eunmi Kim, Suhyun Kim, Hwan-Ki Kim, Dong-Won Lee, Jae Young Seong, Hae-Chul Park
Neuropeptide Y (NPY) is an evolutionarily conserved neuropeptide implicated in feeding regulation in vertebrates. In mammals, NPY neurons coexpress Agouti-related protein (AgRP) in the arcuate nucleus of the hypothalamus, and NPY/AgRP neurons activate orexigenic signaling to increase food intake. Zebrafish express npy and two agrp genes, agrp1 and agrp2, in the brain. Similar to mammals, NPY and AgRP1 act as orexigenic factors in zebrafish, but the exact distribution of NPY and AgRP neurons in the zebrafish brain and the regulation of these genes by metabolic states remain unclear...
January 9, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29329401/morphological-and-functional-characterization-of-non-fast-spiking-gabaergic-interneurons-in-layer-4-microcircuitry-of-rat-barrel-cortex
#8
Vishalini Emmenegger, Guanxiao Qi, Haijun Wang, Dirk Feldmeyer
GABAergic interneurons are notorious for their heterogeneity, despite constituting a small fraction of the neuronal population in the neocortex. Classification of interneurons is crucial for understanding their widespread cortical functions as they provide a complex and dynamic network, balancing excitation and inhibition. Here, we investigated different types of non-fast-spiking (nFS) interneurons in Layer 4 (L4) of rat barrel cortex using whole-cell patch-clamp recordings with biocytin-filling. Based on a quantitative analysis on a combination of morphological and electrophysiological parameters, we identified 5 distinct types of L4 nFS interneurons: 1) trans-columnar projecting interneurons,2) locally projecting non-Martinotti-like interneurons, 3) supra-granular projecting Martinotti-like interneurons,4) intra-columnar projecting VIP-like interneurons,and5) locally projecting neurogliaform-like interneurons...
January 10, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29326172/diversity-and-connectivity-of-layer-5-somatostatin-expressing-interneurons-in-the-mouse-barrel-cortex
#9
Nigro Maximiliano José, Yoshiko Hashikawa, Bernardo Rudy
Inhibitory interneurons represent 10-15% of the neurons in the somatosensory cortex, and their activity powerfully shapes sensory processing. Three major groups of GABAergic interneurons have been defined according to developmental, molecular, morphological, electrophysiological, and synaptic features. Dendritic-targeting somatostatin-expressing interneurons (SST-INs) have been shown to display diverse morphological, electrophysiological and molecular properties and activity patterns in vivo. However, the correlation between these properties and SST-IN subtype is unclear...
January 11, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29322238/development-of-inhibitory-synaptic-inputs-on-layer-2-3-pyramidal-neurons-in-the-rat-medial-prefrontal-cortex
#10
Mari A Virtanen, Claudia Marvine Lacoh, Hubert Fiumelli, Markus Kosel, Shiva Tyagarajan, Mathias de Roo, Laszlo Vutskits
Inhibitory control of pyramidal neurons plays a major role in governing the excitability in the brain. While spatial mapping of inhibitory inputs onto pyramidal neurons would provide important structural data on neuronal signaling, studying their distribution at the single cell level is difficult due to the lack of easily identifiable anatomical proxies. Here, we describe an approach where in utero electroporation of a plasmid encoding for fluorescently tagged gephyrin into the precursors of pyramidal cells along with ionotophoretic injection of Lucifer Yellow can reliably and specifically detect GABAergic synapses on the dendritic arbour of single pyramidal neurons...
January 10, 2018: Brain Structure & Function
https://www.readbyqxmd.com/read/29317225/anatomical-recovery-of-the-gabaergic-system-after-a-complete-spinal-cord-injury-in-lampreys
#11
D Romaus-Sanjurjo, S M Valle-Maroto, A Barreiro-Iglesias, B Fernández-López, M C Rodicio
Lampreys recover locomotion spontaneously several weeks after a complete spinal cord injury. Dysfunction of the GABAergic system following SCI has been reported in mammalian models. So, it is of great interest to understand how the GABAergic system of lampreys adapts to the post-injury situation and how this relates to spontaneous recovery. The spinal cord of lampreys contains 3 populations of GABAergic neurons and most of the GABAergic innervation of the spinal cord comes from these local cells. GABAB receptors are expressed in the spinal cord of lampreys and they play important roles in the control of locomotion...
January 6, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29315524/neonatal-phenobarbital-exposure-disrupts-gabaergic-synaptic-maturation-in-rat-ca1-neurons
#12
Nour Al-Muhtasib, Alberto Sepulveda-Rodriguez, Stefano Vicini, Patrick A Forcelli
OBJECTIVE: Phenobarbital is the most commonly utilized drug for the treatment of neonatal seizures. The use of phenobarbital continues despite growing evidence that it exerts suboptimal seizure control and is associated with long-term alterations in brain structure, function, and behavior. Alterations following neonatal phenobarbital exposure include acute induction of neuronal apoptosis, disruption of synaptic development in the striatum, and a host of behavioral deficits. These behavioral deficits include those in learning and memory mediated by the hippocampus...
January 5, 2018: Epilepsia
https://www.readbyqxmd.com/read/29314192/parvalbumin-producing-striatal-interneurons-receive-excitatory-inputs-onto-proximal-dendrites-from-the-motor-thalamus-in-male-mice
#13
Yasutake Nakano, Fuyuki Karube, Yasuharu Hirai, Kenta Kobayashi, Hiroyuki Hioki, Shinichiro Okamoto, Hiroshi Kameda, Fumino Fujiyama
In rodents, the dorsolateral striatum regulates voluntary movement by integrating excitatory inputs from the motor-related cerebral cortex and thalamus to produce contingent inhibitory output to other basal ganglia nuclei. Striatal parvalbumin (PV)-producing interneurons receiving this excitatory input then inhibit medium spiny neurons (MSNs) and modify their outputs. To understand basal ganglia function in motor control, it is important to reveal the precise synaptic organization of motor-related cortical and thalamic inputs to striatal PV interneurons...
January 4, 2018: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/29311610/interneuron-specific-signaling-evokes-distinctive-somatostatin-mediated-responses-in-adult-cortical-astrocytes
#14
Letizia Mariotti, Gabriele Losi, Annamaria Lia, Marcello Melone, Angela Chiavegato, Marta Gómez-Gonzalo, Michele Sessolo, Serena Bovetti, Angelo Forli, Micaela Zonta, Linda Maria Requie, Iacopo Marcon, Arianna Pugliese, Cécile Viollet, Bernhard Bettler, Tommaso Fellin, Fiorenzo Conti, Giorgio Carmignoto
The signaling diversity of GABAergic interneurons to post-synaptic neurons is crucial to generate the functional heterogeneity that characterizes brain circuits. Whether this diversity applies to other brain cells, such as the glial cells astrocytes, remains unexplored. Using optogenetics and two-photon functional imaging in the adult mouse neocortex, we here reveal that parvalbumin- and somatostatin-expressing interneurons, two key interneuron classes in the brain, differentially signal to astrocytes inducing weak and robust GABAB receptor-mediated Ca2+ elevations, respectively...
January 8, 2018: Nature Communications
https://www.readbyqxmd.com/read/29311142/regulation-of-lateral-hypothalamic-orexin-activity-by-local-gabaergic-neurons
#15
Loris L Ferrari, Daniel Park, Lin Zhu, Matthew R Palmer, Rebecca Y Broadhurst, Elda Arrigoni
Orexin (also known as hypocretin) neurons are considered a key component of the ascending arousal system. They are active during wakefulness, at which time they drive and maintain arousal, and are silent during sleep. Their activity is controlled by long-range inputs from many sources, as well as by more short-range inputs, including from presumptive GABAergic neurons in the lateral hypothalamus/perifornical region (LH/PF). To characterize local GABAergic input to orexin neurons we employed channelrhodopsin-2 (ChR2)-assisted-circuit-mapping in brain slices...
January 8, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29304218/selective-vulnerability-of-brainstem-nuclei-in-distinct-tauopathies-a-postmortem-study
#16
Rana A Eser, Alexander J Ehrenberg, Cathrine Petersen, Sara Dunlop, Maria B Mejia, Claudia K Suemoto, Christine M Walsh, Hima Rajana, Jun Oh, Panos Theofilas, William W Seeley, Bruce L Miller, Thomas C Neylan, Helmut Heinsen, Lea T Grinberg
The brainstem nuclei of the reticular formation (RF) are critical for regulating homeostasis, behavior, and cognition. RF degenerates in tauopathies including Alzheimer disease (AD), progressive supranuclear palsy (PSP), and corticobasal degeneration (CBD). Although the burden of phopho-tau inclusion is high across these diseases, suggesting a similar vulnerability pattern, a distinct RF-associated clinical phenotype in these diseases indicates the opposite. To compare patterns of RF selective vulnerability to tauopathies, we analyzed 5 RF nuclei in tissue from 14 AD, 14 CBD, 10 PSP, and 3 control cases...
January 2, 2018: Journal of Neuropathology and Experimental Neurology
https://www.readbyqxmd.com/read/29302615/homeostatic-changes-in-gaba-and-acetylcholine-muscarinic-receptors-on-gabaergic-neurons-in-the-mesencephalic-reticular-formation-following-sleep-deprivation
#17
Hanieh Toossi, Esther Del Cid-Pellitero, Barbara E Jones
We have examined whether GABAergic neurons in the mesencephalic reticular formation (RFMes), which are believed to inhibit the neurons in the pons that generate paradoxical sleep (PS or REMS), are submitted to homeostatic regulation under conditions of sleep deprivation (SD) by enforced waking during the day in mice. Using immunofluorescence, we investigated first, by staining for c-Fos, whether GABAergic RFMes neurons are active during SD and then, by staining for receptors, whether their activity is associated with homeostatic changes in GABAA or acetylcholine muscarinic type 2 (AChM2) receptors (Rs), which evoke inhibition...
November 2017: ENeuro
https://www.readbyqxmd.com/read/29302200/reexamination-of-dopaminergic-amacrine-cells-in-the-rabbit-retina-confocal-analysis-with-double-and-triple-labeling-immunohistochemistry
#18
Jong Woo Lee, Min Young Lim, Yong Soo Park, Su Jin Park, In-Beom Kim
Dopaminergic amacrine cells (DACs) are among the most well-characterized neurons in the mammalian retina, and their connections to AII amacrine cells have been described in detail. However, the stratification of DAC dendrites differs based on their location in the inner plexiform layer (IPL), raising the question of whether all AII lobules are modulated by dopamine release from DACs. The present study aimed to clarify the relationship between DACs and AII amacrine cells, and to further elucidate the role of dopamine at synapses with AII amacrine cell...
December 2017: Experimental Neurobiology
https://www.readbyqxmd.com/read/29302029/a-neural-basis-for-antagonistic-control-of-feeding-and-compulsive-behaviors
#19
Leandra R Mangieri, Yungang Lu, Yuanzhong Xu, Ryan M Cassidy, Yong Xu, Benjamin R Arenkiel, Qingchun Tong
Abnormal feeding often co-exists with compulsive behaviors, but the underlying neural basis remains unknown. Excessive self-grooming in rodents is associated with compulsivity. Here, we show that optogenetically manipulating the activity of lateral hypothalamus (LH) projections targeting the paraventricular hypothalamus (PVH) differentially promotes either feeding or repetitive self-grooming. Whereas selective activation of GABAergic LH→PVH inputs induces feeding, activation of glutamatergic inputs promotes self-grooming...
January 4, 2018: Nature Communications
https://www.readbyqxmd.com/read/29301063/aberrant-epigenetic-gene-regulation-in-gabaergic-interneuron-subpopulations-in-the-hippocampal-dentate-gyrus-of-mouse-offspring-following-developmental-exposure-to-hexachlorophene
#20
Yousuke Watanabe, Hajime Abe, Kota Nakajima, Maky Ideta-Otsuka, Katsuhide Igarashi, Gye-Hyeong Woo, Toshinori Yoshida, Makoto Shibutani
Maternal hexachlorophene (HCP) exposure causes transient disruption of hippocampal neurogenesis in mouse offspring. We examined epigenetically hypermethylated and downregulated genes related to this HCP-induced disrupted neurogenesis. Mated female mice were dietary exposed to 0 or 100 ppm HCP from gestational day 6 to postnatal day (PND) 21 on weaning. The hippocampal dentate gyrus of male offspring was subjected to methyl-capture sequencing and real-time reverse transcription-PCR analyses on PND 21. Validation analyses on methylation identified three genes, Dlx4, Dmrt1, and Plcb4, showing promoter-region hypermethylation...
January 2, 2018: Toxicological Sciences: An Official Journal of the Society of Toxicology
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