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https://www.readbyqxmd.com/read/28213811/basal-forebrain-cholinergic-system-and-memory
#1
M G Blake, M M Boccia
Basal forebrain cholinergic neurons constitute a way station for many ascending and descending pathways. These cholinergic neurons have a role in eliciting cortical activation and arousal. It is well established that they are mainly involved in cognitive processes requiring increased levels of arousal, attentive states and/or cortical activation with desynchronized activity in the EEG. These cholinergic neurons are modulated by several afferents of different neurotransmitter systems. Of particular importance within the cortical targets of basal forebrain neurons is the hippocampal cortex...
February 18, 2017: Current Topics in Behavioral Neurosciences
https://www.readbyqxmd.com/read/28213446/acetylcholine-release-in-prefrontal-cortex-promotes-gamma-oscillations-and-theta-gamma-coupling-during-cue-detection
#2
W M Howe, H J Gritton, N Lusk, Erik A Roberts, Vaughn L Hetrick, Joshua D Berke, Martin Sarter
The capacity for using external cues to guide behavior ("cue detection") constitutes an essential aspect of attention and goal-directed behavior. The cortical cholinergic input system, via phasic increases in prefrontal acetylcholine release, plays an essential role in attention by mediating such cue detection. However, the relationship between cholinergic signaling during cue detection and neural activity dynamics in prefrontal networks remains unclear. Here we combined sub-second measures of cholinergic signaling, neurophysiological recordings, and cholinergic receptor blockade to delineate the cholinergic contributions to prefrontal oscillations during cue detection in rats...
February 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28211069/mglur1-enhances-efferent-inhibition-of-inner-hair-cells-in-the-developing-rat-cochlea
#3
Zhanlei Ye, Juan D Goutman, Sonja J Pyott, Elisabeth Glowatzki
Just before the onset of hearing, the inner hair cells (IHCs) receive inhibitory efferent input from cholinergic medial olivocochlear (MOC) neurons originating in the brainstem. This input may serve a role in the maturation of the ascending (afferent) auditory system by inhibiting spontaneous activity of the IHCs. To investigate the molecular mechanisms regulating these IHC efferent synapses, we combined electrical stimulation of the efferent fibres with patch clamp recordings from the IHCs to measure efferent synaptic strength...
February 17, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28210777/effects-of-biperiden-and-acute-tryptophan-depletion-and-their-combination-on-verbal-word-memory-and-eeg
#4
Laura G J M Borghans, Arjan Blokland, Anke Sambeth
BACKGROUND: Research on the neurobiological foundations of memory has shown that multiple neurotransmitters play an important role in memory processing. To study the interaction between neurotransmitters such as acetylcholine and serotonin, pharmacological models can be used. In this study, we tested the effects of the muscarinic M1 antagonist biperiden, acute tryptophan depletion (ATD), and the interaction between the two on episodic memory using the verbal learning task. METHODS: The study was conducted according to a double-blind, placebo-controlled, four-way crossover design...
February 16, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28210219/mice-lacking-m1-and-m3-muscarinic-acetylcholine-receptors-have-impaired-odor-discrimination-and-learning
#5
Wilson Chan, Sanmeet Singh, Taj Keshav, Ramita Dewan, Christian Eberly, Robert Maurer, Alexia Nunez-Parra, Ricardo C Araneda
The cholinergic system has extensive projections to the olfactory bulb (OB) where it produces a state-dependent regulation of sensory gating. Previous work has shown a prominent role of muscarinic acetylcholine (ACh) receptors (mAChRs) in regulating the excitability of OB neurons, in particular the M1 receptor. Here, we examined the contribution of M1 and M3 mAChR subtypes to olfactory processing using mice with a genetic deletion of these receptors, the M1(-/-) and the M1/M3(-/-) knockout (KO) mice. Genetic ablation of the M1 and M3 mAChRs resulted in a significant deficit in odor discrimination of closely related molecules, including stereoisomers...
2017: Frontiers in Synaptic Neuroscience
https://www.readbyqxmd.com/read/28209997/antisense-mir-132-blockade-via-the-ache-r-splice-variant-mitigates-cortical-inflammation
#6
Nibha Mishra, Lyndon Friedson, Geula Hanin, Uriya Bekenstein, Meshi Volovich, Estelle R Bennett, David S Greenberg, Hermona Soreq
MicroRNA (miR)-132 brain-to-body messages suppress inflammation by targeting acetylcholinesterase (AChE), but the target specificity of 3'-AChE splice variants and the signaling pathways involved remain unknown. Using surface plasmon resonance (SPR), we identified preferential miR-132 targeting of soluble AChE-R over synaptic-bound AChE-S, potentiating miR-132-mediated brain and body cholinergic suppression of pro-inflammatory cytokines. Inversely, bacterial lipopolysaccharide (LPS) reduced multiple miR-132 targets, suppressed AChE-S more than AChE-R and elevated inflammatory hallmarks...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28209438/excessive-daytime-sleepiness-in-a-patient-with-coexisting-myotonic-dystrophy-type-1-myasthenia-gravis-and-graves-disease
#7
Katarzyna Kapica-Topczewska, Robert Pogorzelski, Joanna Tarasiuk, Wiesław Drozdowski, Piotr Lewczuk, Alina Kułakowska
A 41-year-old female with history of Graves' disease, bilateral cataract, paroxysmal atrial fibrillation was admitted because of muscle weakness, daytime sleepiness, fatigability, drowsiness, bilateral eyelid ptosis, descending of head and lower jaw. On neurological examination the patient was presented with muscle weakness, muscle atrophy (in face and sternocleidomastoid muscles), features of myotonia and apocamnosis (orbicular muscles). Electromyography revealed myopathic changes, myotonic and pseudomyotonic discharges, positive repetitive nerve stimulation test in proximal muscles...
February 3, 2017: Neurologia i Neurochirurgia Polska
https://www.readbyqxmd.com/read/28209287/molecular-imaging-of-the-nicotinic-cholinergic-receptor-in-alzheimer-disease
#8
EDITORIAL
Gwenn S Smith
No abstract text is available yet for this article.
January 5, 2017: American Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/28208063/white-matter-lesions-and-the-cholinergic-deficit-in-aging-and-mild-cognitive-impairment
#9
Nils Richter, Anne Michel, Oezguer A Onur, Lutz Kracht, Markus Dietlein, Marc Tittgemeyer, Bernd Neumaier, Gereon R Fink, Juraj Kukolja
In Alzheimer's disease (AD), white matter lesions (WMLs) are associated with an increased risk of progression from mild cognitive impairment (MCI) to dementia, while memory deficits have, at least in part, been linked to a cholinergic deficit. We investigated the relationship between WML load assessed with the Scheltens scale, cerebral acetylcholinesterase (AChE) activity measured with [(11)C]N-methyl-4-piperidyl acetate PET, and neuropsychological performance in 17 patients with MCI due to AD and 18 cognitively normal older participants...
January 18, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28203147/astrocyte-dependent-slow-inward-currents-sics-participate-in-neuromodulatory-mechanisms-in-the-pedunculopontine-nucleus-ppn
#10
Adrienn Kovács, Balázs Pál
Slow inward currents (SICs) are known as excitatory events of neurons caused by astrocytic glutamate release and consequential activation of neuronal extrasynaptic NMDA receptors. In the present article we investigate the role of these astrocyte-dependent excitatory events on a cholinergic nucleus of the reticular activating system (RAS), the pedunculopontine nucleus (PPN). It is well known about this and other elements of the RAS, that they do not only give rise to neuromodulatory innervation of several areas, but also targets neuromodulatory actions from other members of the RAS or factors providing the homeostatic drive for sleep...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28199851/the-input-output-relationship-of-the-cholinergic-basal-forebrain
#11
Matthew R Gielow, Laszlo Zaborszky
Basal forebrain cholinergic neurons influence cortical state, plasticity, learning, and attention. They collectively innervate the entire cerebral cortex, differentially controlling acetylcholine efflux across different cortical areas and timescales. Such control might be achieved by differential inputs driving separable cholinergic outputs, although no input-output relationship on a brain-wide level has ever been demonstrated. Here, we identify input neurons to cholinergic cells projecting to specific cortical regions by infecting cholinergic axon terminals with a monosynaptically restricted viral tracer...
February 14, 2017: Cell Reports
https://www.readbyqxmd.com/read/28199036/edaravone-attenuates-intracerebroventricular-streptozotocin-induced-cognitive-impairment-in-rats
#12
K H Reeta, Devendra Singh, Y K Gupta
Alzheimer's disease is a major cause of dementia worldwide. Edaravone, a potent free radical scavenger, is reported to be neuroprotective. The present study was designed to investigate the effect of chronic edaravone administration on intracerebroventricular-streptozotocin (ICV-STZ) induced cognitive impairment in male Wistar rats. Cognitive impairment was developed by single ICV-STZ (3 mg/kg) injection bilaterally on day 1. Edaravone (1, 3 and 10 mg/kg, orally, once daily) was administered for 28 days. Morris water maze and passive avoidance tests were used to assess cognitive functions at baseline and on days 14 and 28...
February 15, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28197102/right-cervical-vagotomy-aggravates-viral-myocarditis-in-mice-via-the-cholinergic-anti-inflammatory-pathway
#13
Ge Li-Sha, Chen Xing-Xing, Wu Lian-Pin, Zhou De-Pu, Li Xiao-Wei, Lin Jia-Feng, Li Yue-Chun
The autonomic nervous system dysfunction with increased sympathetic activity and withdrawal of vagal activity may play an important role in the pathogenesis of viral myocarditis. The vagus nerve can modulate the immune response and control inflammation through a 'cholinergic anti-inflammatory pathway' dependent on the α7-nicotinic acetylcholine receptor (α7nAChR). Although the role of β-adrenergic stimulation on viral myocarditis has been investigated in our pervious studies, the direct effect of vagal tone in this setting has not been yet studied...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28197081/basal-forebrain-cholinergic-system-and-orexin-neurons-effects-on-attention
#14
REVIEW
Ines Villano, Antonietta Messina, Anna Valenzano, Fiorenzo Moscatelli, Teresa Esposito, Vincenzo Monda, Maria Esposito, Francesco Precenzano, Marco Carotenuto, Andrea Viggiano, Sergio Chieffi, Giuseppe Cibelli, Marcellino Monda, Giovanni Messina
The basal forebrain (BF) cholinergic system has an important role in attentive functions. The cholinergic system can be activated by different inputs, and in particular, by orexin neurons, whose cell bodies are located within the postero-lateral hypothalamus. Recently the orexin-producing neurons have been proved to promote arousal and attention through their projections to the BF. The aim of this review article is to summarize the evidence showing that the orexin system contributes to attentional processing by an increase in cortical acetylcholine release and in cortical neurons activity...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28196601/cholinergic-signals-from-the-cns-regulate-g-csf-mediated-hsc-mobilization-from-bone-marrow-via-a-glucocorticoid-signaling-relay
#15
Halley Pierce, Dachuan Zhang, Claire Magnon, Daniel Lucas, John R Christin, Matthew Huggins, Gary J Schwartz, Paul S Frenette
Hematopoietic stem cells (HSCs) are mobilized from niches in the bone marrow (BM) to the blood circulation by the cytokine granulocyte colony-stimulating factor (G-CSF) through complex mechanisms. Among these, signals from the sympathetic nervous system regulate HSC egress via its niche, but how the brain communicates with the BM remains largely unknown. Here we show that muscarinic receptor type-1 (Chrm1) signaling in the hypothalamus promotes G-CSF-elicited HSC mobilization via hormonal priming of the hypothalamic-pituitary-adrenal (HPA) axis...
February 4, 2017: Cell Stem Cell
https://www.readbyqxmd.com/read/28196430/first-in-human-trial-of-a-type-i-positive-allosteric-modulator-of-alpha7-nicotinic-acetylcholine-receptors-pharmacokinetics-safety-and-evidence-for-neurocognitive-effect-of-avl-3288
#16
Kelvin W Gee, Ann Olincy, Richard Kanner, Lynn Johnson, Derk Hogenkamp, Josette Harris, Minhtam Tran, Stephen A Edmonds, William Sauer, Ryan Yoshimura, Timothy Johnstone, Robert Freedman
Type I positive allosteric modulators (PAMs) of the alpha7-nicotinic receptor enhance its cholinergic activation while preserving the spatiotemporal features of synaptic transmission and the receptor's characteristic rapid desensitization kinetics. Alpha7-nicotinic receptor agonists have shown promise for improving cognition in schizophrenia, but longer-term trials have been disappointing. Therefore, the type I PAM AVL-3288 was evaluated for safety and preliminary evidence of neurocognitive effect in healthy human subjects...
February 1, 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28194438/a-role-for-muscarinic-receptors-in-neutrophil-extracellular-trap-formation-and-levamisole-induced-autoimmunity
#17
Carmelo Carmona-Rivera, Monica M Purmalek, Erica Moore, Meryl Waldman, Peter J Walter, H Martin Garraffo, Karran A Phillips, Kenzie L Preston, Jonathan Graf, Mariana J Kaplan, Peter C Grayson
Levamisole, an anthelmintic drug with cholinergic properties, has been implicated in cases of drug-induced vasculitis when added to cocaine for profit purposes. Neutrophil extracellular trap (NET) formation is a cell death mechanism characterized by extrusion of chromatin decorated with granule proteins. Aberrant NET formation and degradation have been implicated in idiopathic autoimmune diseases that share features with levamisole-induced autoimmunity as well as in drug-induced autoimmunity. This study's objective was to determine how levamisole modulates neutrophil biology and its putative effects on the vasculature...
February 9, 2017: JCI Insight
https://www.readbyqxmd.com/read/28193693/unresponsive-choline-transporter-as-a-trait-neuromarker-and-a-causal-mediator-of-bottom-up-attentional-biases
#18
Ajeesh Koshy Cherian, Aaron Kucinski, Kyle Pitchers, Brittney Yegla, Vinay Parikh, Youngsoo Kim, Paulina Valuskova, Sarika Gurnani, Craig W Lindsley, Randy D Blakely, Martin Sarter
Some rats (sign-trackers; STs) are prone to attribute incentive salience to reward cues, which can manifest as a propensity to approach and contact Pavlovian cues, and for addiction-like behavior. STs also exhibit poor attentional performance, relative to goal-trackers (GTs), which is associated with attenuated acetylcholine (ACh) levels in prefrontal cortex (Paolone et al., 2013). Here, we demonstrate a cellular mechanism, linked to ACh synthesis, that accounts for attenuated cholinergic capacity in STs. First, we found that electrical stimulation of the basal forebrain increased cortical choline transporter (CHT)-mediated choline transport in GTs, paralleled by a redistribution of CHTs to the synaptic plasma membrane...
February 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28193688/compulsive-social-behavior-emerges-after-selective-ablation-of-striatal-cholinergic-interneurons
#19
Yanina V Martos, Barbara Y Braz, Juan P Beccaria, M Gustavo Murer, Juan E Belforte
The mechanisms underlying social dysfunction in neuropsychiatric conditions like obsessive-compulsive disorder (OCD) and Tourette syndrome (TS) remain uncertain. Dysfunctions in basal ganglia, including reduced number of striatal cholinergic interneurons (SCIN), have been involved in their pathophysiology. To explore the role of SCIN in relation to perseverative behaviors we characterized a new transgenic mouse model in which inducible ablation of SCIN is achieved with high efficiency in a cell-type and region specific manner...
February 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28192878/neuroprotective-effects-of-pretreatment-with-quercetin-as-assessed-by-acetylcholinesterase-assay-and-behavioral-testing-in-poloxamer-407-induced-hyperlipidemic-rats
#20
Josiane B S Braun, Jader B Ruchel, Stephen A Adefegha, Ana Paula V Coelho, Kelly B Trelles, Cristiane Signor, Maribel A Rubin, Juliana S Oliveira, Guilherme L Dornelles, Cinthia M de Andrade, Lívia G Castilhos, Daniela B R Leal
Hyperlipidemia is a group of disorders characterized by excessive lipids in the bloodstream. It is associated with the incidence of cardiovascular diseases and recognized as the most important factor underlying the occurrence of atherosclerosis. This study was conducted to investigate whether pretreatment with quercetin can protect against possible memory impairment and deterioration of the cholinergic system in hyperlipidemic rats. Animals were divided into ten groups (n=7): saline/control, saline/quercetin 5mg/kg, saline/quercetin 25mg/kg, saline/quercetin 50mg/kg, saline/simvastatin (0...
February 7, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
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