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https://www.readbyqxmd.com/read/29444844/the-stomatogastric-nervous-system-of-the-medicinal-leech-its-anatomy-physiology-and-associated-aminergic-neurons
#1
Karen A Mesce, Magda Alania, Quentin Gaudry, Joshua G Puhl
Blood feeding is an essential and signature activity of the medicinal leech species, Hirudo verbana Despite keen interest in understanding the neuronal substrates of this behavior, a major component of the nervous system associated with feeding has remained overlooked. In this study, for the first time, we report on the presence and characteristics of five stomatogastic ganglia (STGs) comprising the visceral stomatogastric nervous system (STN) of the leech. Although Hanke (1948) provided a brief report that a ring of three ganglia (not five) was associated with the cephalic ganglia, this information was never integrated into subsequent neurobiological studies of feeding...
February 14, 2018: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29444425/modulation-of-apoptosis-controls-inhibitory-interneuron-number-in-the-cortex
#2
Myrto Denaxa, Guilherme Neves, Adam Rabinowitz, Sarah Kemlo, Petros Liodis, Juan Burrone, Vassilis Pachnis
Cortical networks are composed of excitatory projection neurons and inhibitory interneurons. Finding the right balance between the two is important for controlling overall cortical excitation and network dynamics. However, it is unclear how the correct number of cortical interneurons (CIs) is established in the mammalian forebrain. CIs are generated in excess from basal forebrain progenitors, and their final numbers are adjusted via an intrinsically determined program of apoptosis that takes place during an early postnatal window...
February 13, 2018: Cell Reports
https://www.readbyqxmd.com/read/29440322/neurodegeneration-in-progressive-multiple-sclerosis
#3
Graham Campbell, Don Mahad
The neuron is the target of inflammatory demyelinating processes in multiple sclerosis (MS). In progressive MS, however, there is a gathering body of evidence indicating molecular changes within neuronal cell bodies. All of these molecular changes to intrinsic neurons converge on mitochondria, and the most reproduced change relates to mitochondrial respiratory chain complex deficiency. This compromise in the capacity to generate ATP in the neuronal cell body is coupled with an increased demand for energy by the demyelinated axon, which is particularly relevant to the long tracts such as corticospinal tracts with long projection axons...
February 12, 2018: Cold Spring Harbor Perspectives in Medicine
https://www.readbyqxmd.com/read/29438716/cholinergic-tone-in-ventral-tegmental-area-functional-organization-and-behavioral-implications
#4
REVIEW
Changzheng Zhang, Xiaodong Liu, Peiling Zhou, Junjie Zhang, Wuming He, Ti-Fei Yuan
The ventral tegmental area (VTA), a pivotal brain region of the mesocorticolimbic dopaminergic system, is substantially innervated and modulated by cholinergic projections from the pedunculopontine tegmental nucleus and laterodorsal tegmental nucleus. In this review, we focus mainly on the current findings on VTA cholinergic compositions and functions, including VTA cholinergic innervations and synaptic connectivity, acetylcholine receptor expression and functional characteristics, cholinergic modulation of neuronal activity and dopamine efflux, cholinergic modulation of VTA-mediated behaviors such as reward and addiction, stress and depression, locomotion, etc...
February 10, 2018: Neurochemistry International
https://www.readbyqxmd.com/read/29438473/in-uncontrolled-diabetes-hyperglucagonemia-and-ketosis-result-from-deficient-leptin-action-in-the-parabrachial-nucleus
#5
Thomas H Meek, Miles E Matsen, Chelsea L Faber, Colby L Samstag, Vincent Damian, Hong T Nguyen, Jarrad M Scarlett, Jonathan N Flak, Martin G Myers, Gregory J Morton
Growing evidence implicates neurons that project from the lateral parabrachial nucleus (LPBN) to the hypothalamic ventromedial nucleus (VMN) in a neurocircuit that drives counterregulatory responses to hypoglycemia, including increased glucagon secretion. Among LPBN neurons in this circuit is a subset that expresses cholecystokinin (LPBNCCK neurons) and is tonically inhibited by leptin. Since uncontrolled diabetes is associated with both leptin deficiency and hyperglucagonemia, and since intracerebroventricular (icv) leptin administration reverses both hyperglycemia and hyperglucagonemia in this setting, we hypothesized that deficient leptin inhibition of LPBNCCK neurons drives activation of this LPBN→VMN circuit and thereby results in hyperglucagonemia...
February 8, 2018: Endocrinology
https://www.readbyqxmd.com/read/29435954/large-scale-exploration-of-neuronal-morphologies-using-deep-learning-and-augmented-reality
#6
Zhongyu Li, Erik Butler, Kang Li, Aidong Lu, Shuiwang Ji, Shaoting Zhang
Recently released large-scale neuron morphological data has greatly facilitated the research in neuroinformatics. However, the sheer volume and complexity of these data pose significant challenges for efficient and accurate neuron exploration. In this paper, we propose an effective retrieval framework to address these problems, based on frontier techniques of deep learning and binary coding. For the first time, we develop a deep learning based feature representation method for the neuron morphological data, where the 3D neurons are first projected into binary images and then learned features using an unsupervised deep neural network, i...
February 12, 2018: Neuroinformatics
https://www.readbyqxmd.com/read/29432883/regulation-of-phosphorylation-of-ampa-glutamate-receptors-by-muscarinic-m4-receptors-in-the-striatum-in-vivo
#7
Li-Min Mao, Nan He, Dao-Zhong Jin, John Q Wang
The acetylcholine muscarinic 4 (M4) receptor is a principal muscarinic receptor subtype present in the striatum. Notably, Gαi/o-coupled M4 receptors and Gαs/Golf-coupled dopamine D1 receptors are coexpressed in striatonigral projection neurons and are thought to interact with each other to regulate neuronal excitability, although underlying molecular mechanisms are poorly understood. In this study, we investigated the role of M4 receptors in the regulation of phosphorylation of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors in the rat normal and dopamine-stimulated striatum in vivo...
February 9, 2018: Neuroscience
https://www.readbyqxmd.com/read/29430520/reward-predictive-neural-activities-in-striatal-striosome-compartments
#8
Tomohiko Yoshizawa, Makoto Ito, Kenji Doya
The striatum has been shown to play a critical role in reward prediction. It is composed of two neurochemically and anatomically distinct compartments known as the striosomes and the matrix. The striosomes comprise only about 15% of the striatum by volume and are distributed mosaically therein. Accordingly, it has been difficult to identify striosomal neurons in electrophysiological recordings and it has been unclear whether striosomal neurons, which project to midbrain dopaminergic neurons, engage in reward prediction...
January 2018: ENeuro
https://www.readbyqxmd.com/read/29429939/an-attractive-reelin-gradient-establishes-synaptic-lamination-in-the-vertebrate-visual-system
#9
Vincenzo Di Donato, Flavia De Santis, Shahad Albadri, Thomas Oliver Auer, Karine Duroure, Marine Charpentier, Jean-Paul Concordet, Christoph Gebhardt, Filippo Del Bene
A conserved organizational and functional principle of neural networks is the segregation of axon-dendritic synaptic connections into laminae. Here we report that targeting of synaptic laminae by retinal ganglion cell (RGC) arbors in the vertebrate visual system is regulated by a signaling system relying on target-derived Reelin and VLDLR/Dab1a on the projecting neurons. Furthermore, we find that Reelin is distributed as a gradient on the target tissue and stabilized by heparan sulfate proteoglycans (HSPGs) in the extracellular matrix (ECM)...
February 5, 2018: Neuron
https://www.readbyqxmd.com/read/29429617/spatial-receptive-fields-for-odor-localization
#10
Hiroshi Nishino, Masazumi Iwasaki, Marco Paoli, Itsuro Kamimura, Atsushi Yoritsune, Makoto Mizunami
Animals rely on olfaction to navigate through complex olfactory landscapes, but the mechanisms that allow an animal to encode the spatial structure of an odorous environment remain unclear. To acquire information about the spatial distribution of an odorant, animals may rely on bilateral olfactory organs and compare side differences of odor intensity and timing [1-6] or may perform spatial and temporal signal integration of subsequent samplings [7]. The American cockroach can efficiently locate a source of sex pheromone even after the removal of one antenna, suggesting that bilateral comparison is not a prerequisite for odor localization in this species [8, 9]...
February 7, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29429614/inversely-active-striatal-projection-neurons-and-interneurons-selectively-delimit-useful-behavioral-sequences
#11
Nuné Martiros, Alexandra A Burgess, Ann M Graybiel
Understanding neural representations of behavioral routines is critical for understanding complex behavior in health and disease. We demonstrate here that accentuated activity of striatal projection neurons (SPNs) at the beginning and end of such behavioral repertoires is a supraordinate representation specifically marking previously rewarded behavioral sequences independent of the individual movements making up the behavior. We recorded spike activity in the striatum and primary motor cortex as individual rats learned specific rewarded lever-press sequences, each one unique to a given rat...
February 1, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29429522/neurochemical-characteristics-of-calbindin-like-immunoreactive-coeliac-cranial-mesenteric-ganglion-complex-ccmg-neurons-supplying-the-pre-pyloric-region-of-the-porcine-stomach
#12
Katarzyna Palus, Michał Bulc, Marta Czajkowska, Bartosz Miciński, Jarosław Całka
The present study was designed to determine the distribution, morphology and co-localization of calbindin-D28k (CB) with other neuroactive substances in the coeliac-cranial mesenteric ganglion complex (CCMG) neurons supplying the prepyloric region of the porcine stomach. In all animals, a median laparotomy was performed and the fluorescent retrograde neuronal tracer Fast Blue was injected into the wall of the stomach prepyloric area. On the 28th day, all animals were euthanized and the CCMG complexes were then collected and processed for double-labelling immunofluorescence for CB and tyrosine hydroxylase (TH), galanin (GAL), somatostatin (SOM), leu 5-enkephalin (LENK), vasoactive intestinal peptide (VIP), substance P (SP) and cocaine- and amphetamine-regulated transcript peptide (CART), Immunohistochemistry revealed that 8...
February 2018: Tissue & Cell
https://www.readbyqxmd.com/read/29427651/chronic-morphine-selectively-sensitizes-the-effect-of-d1-receptor-agonist-on-presynaptic-glutamate-release-in-basolateral-amygdala-neurons-that-project-to-prelimbic-cortex
#13
Jiaojiao Song, Ming Chen, Yi Dong, Bin Lai, Ping Zheng
Drug addiction is a brain disorder characterized by chronic, compulsive use of drugs. Previous studies have found a number of chronic morphine-induced changes in the brain at molecular levels. A study from our lab showed that chronic morphine-induced increase in the expression of presynaptic D1 receptors in basolateral amygdala (BLA) neurons played an important role in environmental cue-induced retrieval of morphine withdrawal memory. However, the downstream neurocircuitry of chronic morphine-induced increase presynaptic D1 receptors in the BLA remains to be elucidated...
February 7, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29427371/cause-or-compensation-altered-neuronal-ca2-handling-in-huntington-s-disease
#14
REVIEW
James P Mackay, Wissam B Nassrallah, Lynn A Raymond
Huntington's disease (HD) is a hereditary neurodegenerative disorder of typically middle-aged onset for which there is no disease-modifying treatment. Caudate and putamen medium-sized spiny projection neurons (SPNs) most severely degenerate in HD. However, it is unclear why mutant huntingtin protein (mHTT) is preferentially toxic to these neurons or why symptoms manifest only relatively late in life. mHTT interacts with numerous neuronal proteins. Likewise, multiple SPN cellular processes have been described as altered in various HD models...
February 9, 2018: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29425490/fast-spiking-interneurons-supply-feedforward-control-of-bursting-calcium-and-plasticity-for-efficient-learning
#15
Scott F Owen, Joshua D Berke, Anatol C Kreitzer
Fast-spiking interneurons (FSIs) are a prominent class of forebrain GABAergic cells implicated in two seemingly independent network functions: gain control and network plasticity. Little is known, however, about how these roles interact. Here, we use a combination of cell-type-specific ablation, optogenetics, electrophysiology, imaging, and behavior to describe a unified mechanism by which striatal FSIs control burst firing, calcium influx, and synaptic plasticity in neighboring medium spiny projection neurons (MSNs)...
February 8, 2018: Cell
https://www.readbyqxmd.com/read/29424424/adult-specific-insulin-producing-neurons-in-drosophila-melanogaster
#16
Yuya Ohhara, Satoru Kobayashi, Kimiko Yamakawa-Kobayashi, Naoki Yamanaka
Holometabolous insects undergo metamorphosis to reorganize their behavioral and morphological features into adult-specific ones. In the central nervous system (CNS), some larval neurons undergo programmed cell death, whereas others go through remodeling of axonal and dendritic arbors to support functions of re-established adult organs. Although there are multiple neuropeptides that have stage-specific roles in holometabolous insects, the reorganization pattern of the entire neuropeptidergic system through metamorphosis still remains largely unclear...
February 9, 2018: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/29422840/mechanisms-underlying-serotonergic-excitation-of-callosal-projection-neurons-in-the-mouse-medial-prefrontal-cortex
#17
Emily K Stephens, Arielle L Baker, Allan T Gulledge
Serotonin (5-HT) selectively excites subpopulations of pyramidal neurons in the neocortex via activation of 5-HT2A (2A) receptors coupled to Gq subtype G-protein alpha subunits. Gq-mediated excitatory responses have been attributed primarily to suppression of potassium conductances, including those mediated by KV7 potassium channels (i.e., the M-current), or activation of non-specific cation conductances that underlie calcium-dependent afterdepolarizations (ADPs). However, 2A-dependent excitation of cortical neurons has not been extensively studied, and no consensus exists regarding the underlying ionic effector(s) involved...
2018: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/29421432/dc-evoked-modulation-of-excitability-of-myelinated-nerve-fibres-and-their-terminal-branches-differences-in-sustained-effects-of-dc
#18
Dominik Kaczmarek, Elzbieta Jankowska
Direct current (DC) evokes long-lasting changes in neuronal networks both presynaptically and postsynaptically and different mechanisms were proposed to be involved in them. Different mechanisms were also suggested to account for the different dynamics of presynaptic DC actions on myelinated nerve fibres stimulated before they entered the spinal grey matter and on their terminal branches. The aim of the present study was to examine whether these different dynamics might be related to differences in the involvement of K+ channels...
February 5, 2018: Neuroscience
https://www.readbyqxmd.com/read/29420934/vigilance-associated-gamma-oscillations-coordinate-the-ensemble-activity-of-basolateral-amygdala-neurons
#19
Alon Amir, Drew B Headley, Seung-Chan Lee, Darrell Haufler, Denis Paré
Principal basolateral amygdala (BL) neurons profoundly influence motivated behaviors, yet few of them are activated by emotionally valenced stimuli. Here, we show that a likely explanation for this paradox is the synchronizing influence of the high-gamma rhythm. High-gamma (75-95 Hz) entrained BL firing more strongly than all other rhythms. It was most pronounced during states of increased vigilance, when rats were apprehensive. Relative to behavioral states, high-gamma produced minor changes in firing rates yet dramatic increases in synchrony...
February 7, 2018: Neuron
https://www.readbyqxmd.com/read/29420932/dopamine-s-effects-on-corticostriatal-synapses-during-reward-based-behaviors
#20
REVIEW
Nigel S Bamford, R Mark Wightman, David Sulzer
Many learned responses depend on the coordinated activation and inhibition of synaptic pathways in the striatum. Local dopamine neurotransmission acts in concert with a variety of neurotransmitters to regulate cortical, thalamic, and limbic excitatory inputs to drive the direct and indirect striatal spiny projection neuron outputs that determine the activity, sequence, and timing of learned behaviors. We review recent advances in the characterization of stereotyped neuronal and operant responses that predict and then obtain rewards...
February 7, 2018: Neuron
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