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https://www.readbyqxmd.com/read/28916629/histone-deacetylase-inhibition-induces-odor-preference-memory-extension-and-maintains-enhanced-ampa-receptor-expression-in-the-rat-pup-model
#1
Sriya Bhattacharya, Bandhan Mukherjee, Jules J E Doré, Qi Yuan, Carolyn W Harley, John H McLean
Histone deacetylase (HDAC) plays a role in synaptic plasticity and long-term memory formation. We hypothesized that trichostatin-A (TSA), an HDAC inhibitor, would promote long-term odor preference memory and maintain enhanced GluA1 receptor levels that have been hypothesized to support memory. We used an early odor preference learning model in neonate rat pups that normally produces only 24-h memory to test behavior and examine receptor protein expression. Our behavioral studies showed that intrabulbar infusion of TSA, prior to pairing of the conditioned stimulus (peppermint odor) with the unconditioned stimulus (tactile stimulation), prolonged 24-h odor preference memory for at least 9 d...
October 2017: Learning & Memory
https://www.readbyqxmd.com/read/28916283/deuterated-d6-dextromethorphan-elicits-antidepressant-like-effects-in-mice
#2
Linda Nguyen, Anna L Scandinaro, Rae R Matsumoto
The over-the-counter antitussive dextromethorphan (DM) may have rapid antidepressant actions based on its overlapping pharmacology with ketamine, which has shown fast antidepressant effects but whose widespread use remains limited by problematic side effects. We have previously shown that DM produces antidepressant-like effects in the forced swim test (FST) and tail suspension test (TST) that are mediated in part through α-amino-3-hydroxy-5-methyl-4-isoxazole propionic (AMPA) and sigma-1 receptors, two protein targets associated with a faster onset of antidepressant efficacy...
September 12, 2017: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/28916137/oxytocin-induces-penile-erection-and-yawning-when-injected-into-the-bed-nucleus-of-the-stria-terminalis-involvement-of-glutamic-acid-dopamine-and-nitric-oxide
#3
Fabrizio Sanna, Jessica Bratzu, Antonio Argiolas, Maria Rosaria Melis
Oxytocin (5-100ng), but not Arg(8)-vasopressin (100ng), injected unilaterally into the bed nucleus of the stria terminalis (BNST) induces penile erection and yawning in a dose-dependent manner in male rats. The minimal effective dose was 20ng for penile erection and 5ng for yawning. Oxytocin responses were abolished not only by the oxytocin receptor antagonist d(CH2)5Tyr(Me)(2)-Orn(8)-vasotocin (1μg), but also by (+) MK-801 (1μg), an excitatory amino acid receptor antagonist of the N-methyl-d-aspartic acid (NMDA) subtype, SCH 23390 (1μg), a D1 receptor antagonist, but not haloperidol (1μg), a D2 receptor antagonist, and SMTC (40μg), an inhibitor of neuronal nitric oxide synthase, injected into the BNST 15min before oxytocin...
September 12, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28914603/synaptic-up-scaling-preserves-motor-circuit-output-after-chronic-natural-inactivity
#4
Joseph M Santin, Mauricio Vallejo, Lynn K Hartzler
Neural systems use homeostatic plasticity to maintain normal brain functions and to prevent abnormal activity.  Surprisingly, homeostatic mechanisms that regulate circuit output have mainly been demonstrated during artificial and/or pathological perturbations.  Natural, physiological scenarios that activate these stabilizing mechanisms in neural networks of mature animals remain elusive.  To establish the extent to which a naturally inactive circuit engages mechanisms of homeostatic plasticity, we utilized the respiratory motor circuit in bullfrogs that normally remains inactive for several months during the winter...
September 15, 2017: ELife
https://www.readbyqxmd.com/read/28913780/anxiolytic-like-effects-of-%C3%AE-asarone-in-a-mouse-model-of-chronic-pain
#5
Jiao Tian, Zhen Tian, Shu-Li Qin, Pu-Yu Zhao, Xun Jiang, Zhen Tian
α-asarone (ASR) is a major bioactive compound isolated from the rhizome of Acorus tatarinowii Schott and it has extensive biological effects. Clinically, anxiety disorder is a common comorbidity of chronic pain. However, limited information is available regarding the effects of ASR on chronic pain-related anxiety. This study aims to evaluate the anxiolytic effects of ASR in chronic pain mice. Chronic inflammatory pain was induced by hind-paw injection of complete Freund's adjuvant (CFA). Behavioral tests, western-blot analysis and whole-cell patch recordings were performed to evaluate the subsequent events...
September 15, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28912687/alterations-in-properties-of-glutamatergic-transmission-in-the-temporal-cortex-and-hippocampus-following-pilocarpine-induced-acute-seizures-in-wistar-rats
#6
Dmitry V Amakhin, Sergey L Malkin, Julia L Ergina, Kirill A Kryukov, Ekaterina A Veniaminova, Olga E Zubareva, Aleksey V Zaitsev
Temporal lobe epilepsy (TLE) is the most common type of focal epilepsy in humans, and is often developed after an initial precipitating brain injury. This form of epilepsy is frequently resistant to pharmacological treatment; therefore, the prevention of TLE is the prospective approach to TLE therapy. The lithium-pilocarpine model in rats replicates some of the main features of TLE in human, including the pathogenic mechanisms of cell damage and epileptogenesis after a primary brain injury. In the present study, we investigated changes in the properties of glutamatergic transmission during the first 3 days after pilocarpine-induced acute seizures in Wistar rats (PILO-rats)...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28912160/dopamine-d2-receptors-modulate-pyramidal-neurons-in-mouse-medial-prefrontal-cortex-through-a-stimulatory-g-protein-pathway
#7
Sarah E Robinson, Vikaas S Sohal
Dopaminergic modulation of prefrontal cortex is believed to play key roles in many cognitive functions and to be disrupted in pathological conditions such as schizophrenia. We have previously described a phenomenon whereby dopamine D2 receptor (D2R) activation elicits afterdepolarizations (ADPs) in subcortically-projecting (SC) pyramidal neurons within L5 of the prefrontal cortex. These D2R-induced ADPs only occur following synaptic input which activates NMDA receptors (NMDARs) even when the delay between the synaptic input and afterdepolarizations is relatively long, e...
September 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28904854/protein-kinase-c-regulates-ampa-receptor-auxiliary-protein-shisa9-ckamp44-through-interactions-with-neuronal-scaffold-pick1
#8
Stella-Amrei Kunde, Nils Rademacher, Hanna Zieger, Sarah A Shoichet
Synaptic α-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate (AMPA) receptors are essential mediators of neurotransmission in the central nervous system. Shisa9/cysteine-knot AMPAR modulating protein 44 (CKAMP44) is a transmembrane protein recently found to be present in AMPA receptor-associated protein complexes. Here, we show that the cytosolic tail of Shisa9/CKAMP44 interacts with multiple scaffold proteins that are important for regulating synaptic plasticity in central neurons. We focussed on the interaction with the scaffold protein PICK1, which facilitates the formation of a tripartite complex with the protein kinase C (PKC) and thereby regulates phosphorylation of Shisa9/CKAMP44 C-terminal residues...
September 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/28904093/sodium-dynamics-in-pyramidal-neuron-dendritic-spines-synaptically-evoked-entry-predominantly-through-ampa-receptors-and-removal-by-diffusion
#9
Kenichi Miyazaki, William N Ross
Dendritic spines are key elements underlying synaptic integration and cellular plasticity, but many features of these important structures are not known or are controversial. We examined these properties with newly developed simultaneous sodium and calcium imaging that had single spine resolution in pyramidal neurons in rat hippocampal slices from either sex. Indicators for both ions were loaded through the somatic patch pipette, which also recorded electrical responses. Fluorescence changes were detected with a high speed, low noise CCD camera...
September 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28904092/map1b-light-chain-modulates-synaptic-transmission-via-ampa-receptor-intracellular-trapping
#10
Rocío Palenzuela, Yolanda Gutiérrez, Jonathan E Draffin, Argentina Lario, Marion Benoist, José A Esteban
The regulated transport of AMPA-type glutamate receptors (AMPARs) to the synaptic membrane is a key mechanism to determine the strength of excitatory synaptic transmission in the brain. In this work, we uncovered a new role for the microtubule-associated protein MAP1B, in modulating the access of AMPARs to the postsynaptic membrane. Using mice and rats of either sex, we show that MAP1B light chain (LC) accumulates in the somatodendritic compartment of hippocampal neurons, where it forms immobile complexes on microtubules that limit vesicular transport...
September 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28902836/hippocampal-ltp-and-contextual-learning-require-surface-diffusion-of-ampa-receptors
#11
A C Penn, C L Zhang, F Georges, L Royer, C Breillat, E Hosy, J D Petersen, Y Humeau, D Choquet
Long-term potentiation (LTP) of excitatory synaptic transmission has long been considered a cellular correlate for learning and memory. Early LTP (less than 1 h) had initially been explained either by presynaptic increases in glutamate release or by direct modification of postsynaptic AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid) receptor function. Compelling models have more recently proposed that synaptic potentiation can occur by the recruitment of additional postsynaptic AMPA receptors (AMPARs), sourced either from an intracellular reserve pool by exocytosis or from nearby extra-synaptic receptors pre-existing on the neuronal surface...
September 13, 2017: Nature
https://www.readbyqxmd.com/read/28901289/distinct-stages-of-synapse-elimination-are-induced-by-burst-firing-of-ca1-neurons-and-differentially-require-mef2a-d
#12
Chia-Wei Chang, Julia Wilkerson, Carly Hale, Jay R Gibson, Kimberly M Huber
Experience and activity refine cortical circuits through synapse elimination, but little is known about the activity patterns and downstream molecular mechanisms that mediate this process. We used optogenetics to drive individual mouse CA1 hippocampal neurons to fire in theta frequency bursts to understand how cell autonomous, postsynaptic activity leads to synapse elimination. Brief (1hr) periods of postsynaptic bursting selectively depressed AMPA receptor (R) synaptic transmission, or silenced excitatory synapses, whereas more prolonged (24 hr) firing depressed both AMPAR and NMDAR EPSCs and eliminated spines, indicative of a synapse elimination...
September 13, 2017: ELife
https://www.readbyqxmd.com/read/28901011/persistent-aberrant-cortical-phase-amplitude-coupling-following-seizure-treatment-in-absence-epilepsy-models
#13
Atul Maheshwari, Abraham Akbar, Mai Wang, Rachel Marks, Katherine Yu, Suhyeorn Park, Brett L Foster, Jeffrey L Noebels
In childhood absence epilepsy, cortical seizures are brief and intermittent; however there are extended periods without behavioural or electrographic ictal events. This genetic disorder is associated with variable degrees of cognitive dysfunction, but no consistent functional biomarkers that might provide insight into interictal cortical function have been described. Previous work in monogenic mouse models of absence epilepsy have shown that the interictal EEG displays augmented beta/gamma power in homozygous stargazer (stg/stg) mice bearing a presynaptic AMPA receptor defect, but not homozygous tottering (tg/tg) mice with a P/Q type calcium channel mutation...
September 12, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28899869/autism-like-behavior-caused-by-deletion-of-vaccinia-related-kinase-3-is-improved-by-trkb-stimulation
#14
Myung-Su Kang, Tae-Yong Choi, Hye Guk Ryu, Dohyun Lee, Seung-Hyun Lee, Se-Young Choi, Kyong-Tai Kim
Vaccinia-related kinases (VRKs) are multifaceted serine/threonine kinases that play essential roles in various aspects of cell signaling, cell cycle progression, apoptosis, and neuronal development and differentiation. However, the neuronal function of VRK3 is still unknown despite its etiological potential in human autism spectrum disorder (ASD). Here, we report that VRK3-deficient mice exhibit typical symptoms of autism-like behavior, including hyperactivity, stereotyped behaviors, reduced social interaction, and impaired context-dependent spatial memory...
September 12, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28891049/differential-projections-of-the-densocellular-and-intermediate-parts-of-the-hyperpallium-in-the-pigeon-columba-livia
#15
Yasuro Atoji, Sonjoy Sarkar, J Martin Wild
The visual Wulst in birds shows a four-layered structure: apical part of the hyperpallium (HA), interstitial part of HA (IHA), intercalated part of hyperpallium (HI), and densocellular part of hyperpallium (HD). HD also connects with the hippocampus and olfactory system. Because HD is subjacent to HI, the two have been treated as one structure in many studies, and the fiber connections of HD have been examined by afferents and efferents originating outside HD. However, to clarify the difference between these two layers, they need to be treated separately...
September 10, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28890422/transcriptional-and-post-translational-regulation-of-arc-in-synaptic-plasticity
#16
REVIEW
Ruth E Carmichael, Jeremy M Henley
One of the most interesting features of Arc-dependent synaptic plasticity is how multiple types of synaptic activity can converge to alter Arc transcription and then diverge to induce different plasticity outcomes, ranging from AMPA receptor internalisation that promotes long-term depression (LTD), to actin stabilisation that promotes long-term potentiation (LTP). This diversity suggests that there must be numerous levels of control to ensure the temporal profile, abundance, localisation and function of Arc are appropriately regulated to effect learning and memory in the correct contexts...
September 7, 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/28890421/the-mechanistic-link-between-arc-arg3-1-expression-and-ampa-receptor-endocytosis
#17
REVIEW
Mark J Wall, Sonia A L Corrêa
The activity-regulated cytoskeleton associated protein (Arc/Arg3.1) plays a key role in determining synaptic strength through facilitation of AMPA receptor (AMPAR) endocytosis. Although there is considerable data on the mechanism by which Arc induction controls synaptic plasticity and learning behaviours, several key mechanistic questions remain. Here we review data on the link between Arc expression and the clathrin-mediated endocytic pathway which internalises AMPARs and discuss the significance of Arc binding to the clathrin adaptor protein 2 (AP-2) and to endophilin/dynamin...
September 7, 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/28890418/arc-ubiquitination-in-synaptic-plasticity
#18
REVIEW
Angela M Mabb, Michael D Ehlers
The activity-regulated cytoskeleton-associated protein (Arc) is a neuron-expressed activity regulated immediate early gene (IEG) product that is essential for memory consolidation and serves as a direct readout for neural activation during learning. Arc contributes to diverse forms of synaptic plasticity mediated by the trafficking of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors. Notably, Arc protein expression abruptly increases and then rapidly decreases following augmented network activity...
September 7, 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/28890345/prosapip1-dependent-synaptic-adaptations-in-the-nucleus-accumbens-drive-alcohol-intake-seeking-and-reward
#19
Sophie Laguesse, Nadege Morisot, Jung Hoon Shin, Feng Liu, Martin F Adrover, Samuel A Sakhai, Marcelo F Lopez, Khanhky Phamluong, William C Griffin, Howard C Becker, Kevin J Bender, Veronica A Alvarez, Dorit Ron
The mammalian target of rapamycin complex 1 (mTORC1), a transducer of local dendritic translation, participates in learning and memory processes as well as in mechanisms underlying alcohol-drinking behaviors. Using an unbiased RNA-seq approach, we identified Prosapip1 as a novel downstream target of mTORC1 whose translation and consequent synaptic protein expression are increased in the nucleus accumbens (NAc) of mice excessively consuming alcohol. We demonstrate that alcohol-dependent increases in Prosapip1 levels promote the formation of actin filaments, leading to changes in dendritic spine morphology of NAc medium spiny neurons (MSNs)...
September 7, 2017: Neuron
https://www.readbyqxmd.com/read/28890050/modulation-of-hippocampal-synapse-maturation-by-activity-regulated-e3-ligase-via-non-canonical-pathway
#20
Pushpa Kumari, Balakumar Srinivasan, Sourav Banerjee
Development of functional synapses is crucial for the transmission and storage of information in the brain. Post establishment of the initial synaptic contact, synapses are stabilized through neuronal activity-induced signals. Emerging studies have implicated ubiquitination; a reversible posttranslational modification, as a key regulatory switch that modulates synapse development through proteasomal degradation. Ubiquitination of proteins is precisely regulated by E3 ligases, a set of enzymes that bind to specific substrates to facilitate the conjugation of monomeric or polymeric ubiquitin...
September 8, 2017: Neuroscience
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