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https://www.readbyqxmd.com/read/28100806/the-lateral-line-confers-evolutionarily-derived-sleep-loss-in-the-mexican-cavefish
#1
James Jaggard, Beatriz G Robinson, Bethany A Stahl, Ian Oh, Pavel Masek, Masato Yoshizawa, Alex C Keene
Sleep is an essential behavior exhibited by nearly all animals, and disruption of this process is associated with an array of physiological and behavioral deficits. Sleep is defined by changes in sensory gating that reduce sensory input to the brain, but little is known about the neural basis for interactions between sleep and sensory processing. Blind Mexican cavefish comprise an extant surface dwelling form and 29 cave morphs that have independently evolved increased numbers of mechanoreceptive lateral line neuromasts and convergent evolution of sleep loss...
January 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28100734/does-the-superior-colliculus-control-perceptual-sensitivity-or-choice-bias-during-attention-evidence-from-a-multialternative-decision-framework
#2
Devarajan Sridharan, Nicholas A Steinmetz, Tirin Moore, Eric I Knudsen
: Distinct networks in the forebrain and the midbrain coordinate to control spatial attention. The critical involvement of the superior colliculus (SC)-the central structure in the midbrain network-in visuospatial attention has been shown by four seminal, published studies in monkeys (Macaca mulatta) performing multialternative tasks. However, due to the lack of a mechanistic framework for interpreting behavioral data in such tasks, the nature of the SC's contribution to attention remains unclear...
January 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28092779/aberrant-spontaneous-neural-activity-and-correlation-with-evoked-brain-potentials-in-first-episode-treatment-na%C3%A3-ve-patients-with-deficit-and-non-deficit-schizophrenia
#3
Zhe Li, Wei Lei, Wei Deng, Zhong Zheng, Mingli Li, Xiaohong Ma, Qiang Wang, Chaohua Huang, Na Li, David A Collier, Qiyong Gong, Tao Li
The goals of the study were to analyze spontaneous neural activity between deficit and non-deficit schizophrenia (DS, NDS) using resting-state fMRI, and to investigate the correlation of fMRI with clinical features and evoked brain potentials. The amplitude of low frequency fluctuation (ALFF) was measured in 41 DS participants, 42 NDS participants, and 42 healthy controls. ALFF in the bilateral cerebellum posterior lobe was significantly decreased in patients, while ALFF in the right fusiform gyrus and the bilateral putamen was significantly increased...
January 5, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28087896/eag-channels-expressed-in-microvillar-photoreceptors-are-unsuited-to-diurnal-vision
#4
Esa-Ville Immonen, Andrew S French, Päivi H Torkkeli, Hongxia Liu, Mikko Vähäsöyrinki, Roman V Frolov
The principles underlying evolutionary selection of ion channels for expression in sensory neurons are unclear. Among species possessing microvillar photoreceptors the major ionic conductances have only been identified in Drosophila melanogaster. In Drosophila depolarization is provided by light-activated TRP channels with a minor contribution from TRPL channels, while repolarization is mediated by sustained voltage-gated K(+) (Kv) channels of the Shab family. Bright light stimulates Shab channels, further restricting depolarization and improving membrane bandwidth...
January 13, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28074005/synergistic-regulation-of-serotonin-and-opioid-signaling-contributes-to-pain-insensitivity-in-nav1-7-knockout-mice
#5
Jörg Isensee, Leonhardt Krahé, Katharina Moeller, Vanessa Pereira, Jane E Sexton, Xiaohui Sun, Edward Emery, John N Wood, Tim Hucho
Genetic loss of the voltage-gated sodium channel Nav1.7 (Nav1.7(-/-)) results in lifelong insensitivity to pain in mice and humans. One underlying cause is an increase in the production of endogenous opioids in sensory neurons. We analyzed whether Nav1.7 deficiency altered nociceptive heterotrimeric guanine nucleotide-binding protein-coupled receptor (GPCR) signaling, such as initiated by GPCRs that respond to serotonin (pronociceptive) or opioids (antinociceptive), in sensory neurons. We found that the nociceptive neurons of Nav1...
January 10, 2017: Science Signaling
https://www.readbyqxmd.com/read/28053034/simultaneous-loss-of-nckx4-and-cng-channel-desensitization-impairs-olfactory-sensitivity
#6
Christopher H Ferguson, Haiqing Zhao
: In vertebrate olfactory sensory neurons (OSNs), Ca(2+) plays key roles in both mediating and regulating the olfactory response. Ca(2+) enters OSN cilia during the response through the olfactory cyclic nucleotide-gated (CNG) channel and stimulates a depolarizing chloride current by opening the olfactory Ca(2+)-activated chloride channel to amplify the response. Ca(2+) also exerts negative regulation on the olfactory transduction cascade, through mechanisms that include reducing the CNG current by desensitizing the CNG channel via Ca(2+)/calmodulin (CaM), to reduce the response...
January 4, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28039669/the-development-of-the-sgi-16-a-shortened-sensory-gating-deficit-and-distractibility-questionnaire-for-adults-with-adhd
#7
Jean-Arthur Micoulaud-Franchi, Régis Lopez, Pierre Michel, Laura Brandejsky, Stéphanie Bioulac, Pierre Philip, Christophe Lancon, Laurent Boyer
The Sensory Gating Inventory (SGI) is a questionnaire composed of 36 items designed to investigate abnormal perception related to the inability to control sensitivity to sensory stimuli frequently reported in adult with ADHD. This questionnaire can be considered too lengthy to be taken by people with ADHD, and a shortened version is needed. One hundred and sixty-three adults with ADHD responded to the SGI-36. An item reduction process took into account both the results of statistical analyses and the expertise of a steering committee...
December 30, 2016: Attention Deficit and Hyperactivity Disorders
https://www.readbyqxmd.com/read/28038937/cellular-permeation-of-large-molecules-mediated-by-trpm8-channels
#8
Daniel D McCoy, Radhika Palkar, Yuening Yang, Serra Ongun, David D McKemy
While most membrane channels are only capable of passing small ions, certain non-selective cation channels have been recently shown to have the capacity to permeate large cations. The mechanisms underlying large molecule permeation are unclear, but this property has been exploited pharmacologically to target molecules, such as nerve conduction blockers, to specific subsets of pain-sensing neurons (nociceptors) expressing the heat-gated transient receptor potential (TRP) channel TRPV1. However, it is not clear if the principal mediator of cold stimuli TRPM8 is capable of mediating the permeation large molecules across cell membranes, suggesting that TRPM8-positive nerves cannot be similarly targeted...
December 27, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/28024908/hyp-17-a-novel-voltage-gated-sodium-channel-blocker-relieves-inflammatory-and-neuropathic-pain-in-rats
#9
Jee Youn Lee, Yoo Lim Kam, Jungae Oh, Dong Hyun Kim, Jin-Sung Choi, Hae Young Choi, Sungmin Han, Inchan Youn, Hea-Young Park Choo, Tae Young Yune
Clinical and experimental studies suggest that voltage-gated sodium channels (VGSCs) play a key role in the pathogenesis of neuropathic pain and that blocking agents against these channels can be potentially therapeutic. In the current study, we investigated whether a novel compound, (-)-2-Amino-1-(4-((4-chlorophenyl)(phenyl)methyl)piperazin-1-yl)-propan-1-one(HYP-17), binds to VGSCs and evaluated its inhibitory effect on Na(+) currents of the rat dorsal root ganglia (DRG) sensory neurons and its analgesic effect on inflammatory and neuropathic pain...
December 24, 2016: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/28005923/respiration-gates-sensory-input-responses-in-the-mitral-cell-layer-of-the-olfactory-bulb
#10
Shaina M Short, Thomas M Morse, Thomas S McTavish, Gordon M Shepherd, Justus V Verhagen
Respiration plays an essential role in odor processing. Even in the absence of odors, oscillating excitatory and inhibitory activity in the olfactory bulb synchronizes with respiration, commonly resulting in a burst of action potentials in mammalian mitral/tufted cells (MTCs) during the transition from inhalation to exhalation. This excitation is followed by inhibition that quiets MTC activity in both the glomerular and granule cell layers. Odor processing is hypothesized to be modulated by and may even rely on respiration-mediated activity, yet exactly how respiration influences sensory processing by MTCs is still not well understood...
2016: PloS One
https://www.readbyqxmd.com/read/27941788/small-molecule-inhibition-of-stoml3-oligomerization-reverses-pathological-mechanical-hypersensitivity
#11
Christiane Wetzel, Simone Pifferi, Cristina Picci, Caglar Gök, Diana Hoffmann, Kiran K Bali, André Lampe, Liudmila Lapatsina, Raluca Fleischer, Ewan St John Smith, Valérie Bégay, Mirko Moroni, Luc Estebanez, Johannes Kühnemund, Jan Walcher, Edgar Specker, Martin Neuenschwander, Jens Peter von Kries, Volker Haucke, Rohini Kuner, James F A Poulet, Jan Schmoranzer, Kate Poole, Gary R Lewin
The skin is equipped with specialized mechanoreceptors that allow the perception of the slightest brush. Indeed, some mechanoreceptors can detect even nanometer-scale movements. Movement is transformed into electrical signals via the gating of mechanically activated ion channels at sensory endings in the skin. The sensitivity of Piezo mechanically gated ion channels is controlled by stomatin-like protein-3 (STOML3), which is required for normal mechanoreceptor function. Here we identify small-molecule inhibitors of STOML3 oligomerization that reversibly reduce the sensitivity of mechanically gated currents in sensory neurons and silence mechanoreceptors in vivo...
December 12, 2016: Nature Neuroscience
https://www.readbyqxmd.com/read/27927796/g9a-inhibits-creb-triggered-expression-of-mu-opioid-receptor-in-primary-sensory-neurons-following-peripheral-nerve-injury
#12
Lingli Liang, Jian-Yuan Zhao, Xiyao Gu, Shaogen Wu, Kai Mo, Ming Xiong, Brianna Marie Lutz, Alex Bekker, Yuan-Xiang Tao
Neuropathic pain, a distressing and debilitating disorder, is still poorly managed in clinic. Opioids, like morphine, remain the mainstay of prescribed medications in the treatment of this disorder, but their analgesic effects are highly unsatisfactory in part due to nerve injury-induced reduction of opioid receptors in the first-order sensory neurons of dorsal root ganglia. G9a is a repressor of gene expression. We found that nerve injury-induced increases in G9a and its catalyzed repressive marker H3K9m2 are responsible for epigenetic silencing of Oprm1, Oprk1, and Oprd1 genes in the injured dorsal root ganglia...
2016: Molecular Pain
https://www.readbyqxmd.com/read/27917413/efficacy-of-s-lacosamide-in-preclinical-models-of-cephalic-pain
#13
Aubin Moutal, Nathan Eyde, Edwin Telemi, Ki Duk Park, Jennifer Y Xie, David W Dodick, Frank Porreca, Rajesh Khanna
Migraine is one of the world's most common neurological disorders. Current acute migraine treatments have sub-optimal efficacy and new therapeutic options are needed. Approaches targeting calcitonin gene related peptide (CGRP) signaling are clinically effective but small molecule antagonists have not been advanced due to toxicity. In this study, we explored the axonal growth/specification collapsin response mediator protein 2 (CRMP2) as a novel "druggable" target for inhibiting CGRP release and for potential relevance for treatment of migraine pain...
June 2016: Pain Reports (Baltimore, Md.)
https://www.readbyqxmd.com/read/27911746/new-insight-in-cold-pain-role-of-ion-channels-modulation-and-clinical-perspectives
#14
Stéphane Lolignier, Dimitra Gkika, David Andersson, Enrico Leipold, Irina Vetter, Felix Viana, Jacques Noël, Jérôme Busserolles
Cold temperature detection involves the process of sensory transduction in cutaneous primary sensory nerve terminals, which converts thermal stimuli into depolarizations of the membrane. This transformation into electrical signals is followed by the subsequent propagation of action potentials in cold-sensitive afferent nerve fibers. A large array of ion channels shapes this process; however, the precise contribution of specific ion channel subtypes to cold perception and cold pain remains elusive. This review aims at giving an update on our current understanding of the role played by TRPs, leak K(+) and voltage-gated Na(+) and K(+) channels in the transduction of cold by nociceptors and in cold-induced pain...
November 9, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27874088/g9a-participates-in-nerve-injury-induced-kcna2-downregulation-in-primary-sensory-neurons
#15
Lingli Liang, Xiyao Gu, Jian-Yuan Zhao, Shaogen Wu, Xuerong Miao, Jifang Xiao, Kai Mo, Jun Zhang, Brianna Marie Lutz, Alex Bekker, Yuan-Xiang Tao
Nerve injury-induced downregulation of voltage-gated potassium channel subunit Kcna2 in the dorsal root ganglion (DRG) is critical for DRG neuronal excitability and neuropathic pain genesis. However, how nerve injury causes this downregulation is still elusive. Euchromatic histone-lysine N-methyltransferase 2, also known as G9a, methylates histone H3 on lysine residue 9 to predominantly produce a dynamic histone dimethylation, resulting in condensed chromatin and gene transcriptional repression. We showed here that blocking nerve injury-induced increase in G9a rescued Kcna2 mRNA and protein expression in the axotomized DRG and attenuated the development of nerve injury-induced pain hypersensitivity...
November 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27861889/margatoxin-bound-quantum-dots-as-a-novel-inhibitor-of-the-voltage-gated-ion-channel-kv1-3
#16
Austin B Schwartz, Anshika Kapur, Wentao Wang, Zhenbo Huang, Erminia Fardone, Goutam Palui, Hedi Mattoussi, Debra Ann Fadool
Venom-derived ion channel inhibitors have strong channel selectivity, potency, and stability; however, tracking delivery to their target can be challenging. Herein, we utilized luminescent quantum dots (QDs) conjugated to margatoxin (MgTx) as a traceable vehicle to target a voltage-dependent potassium channel, Kv1.3, which has a select distribution and well-characterized role in immunity, glucose metabolism, and sensory ability. We screened both unconjugated (MgTx) and conjugated MgTx (QD-MgTx) for their ability to inhibit Shaker channels Kv1...
November 8, 2016: Journal of Neurochemistry
https://www.readbyqxmd.com/read/27854251/nociceptive-trp-channels-sensory-detectors-and-transducers-in-multiple-pain-pathologies
#17
REVIEW
Aaron D Mickle, Andrew J Shepherd, Durga P Mohapatra
Specialized receptors belonging to the transient receptor potential (TRP) family of ligand-gated ion channels constitute the critical detectors and transducers of pain-causing stimuli. Nociceptive TRP channels are predominantly expressed by distinct subsets of sensory neurons of the peripheral nervous system. Several of these TRP channels are also expressed in neurons of the central nervous system, and in non-neuronal cells that communicate with sensory nerves. Nociceptive TRPs are activated by specific physico-chemical stimuli to provide the excitatory trigger in neurons...
November 14, 2016: Pharmaceuticals
https://www.readbyqxmd.com/read/27843683/spinal-neuromodulation-as-a-novel-surgical-option-for-failed-back-surgery-syndrome-following-rhbmp-exuberant-bony-growth-in-instrumented-lumbar-fusion-a-case-report-and-literature-review
#18
Ramsis F Ghaly, Alexei Lissounov, Tatiana Tverdohleb, David Kohanchi, Kenneth D Candido, Nebojsa Nick Knezevic
BACKGROUND: Bone morphogenic protein (BMP) for instrumented lumbar fusion was approved in 2002, and since then has led to an increasing incidence of BMP-related neuropathic pain. These patients are usually resistant to conventional medical therapy and frequently undergo multiple surgical revisions without any pain relief. CASE DESCRIPTION: A 58-year-old male was referred to the author's outpatient clinic after four lumbar surgeries did not provide satisfactory pain relief...
2016: Surgical Neurology International
https://www.readbyqxmd.com/read/27827430/lactate-is-a-potent-inhibitor-of-the-capsaicin-receptor-trpv1
#19
Jeanne de la Roche, Isabella Walther, Waleria Leonow, Axel Hage, Mirjam Eberhardt, Martin Fischer, Peter W Reeh, Susanne Sauer, Andreas Leffler
Tissue ischemia results in an accumulation of lactate and local or systemic lactic acidosis. In nociceptive sensory neurons, lactate was reported to sensitize or activate the transient receptor potential ion channel TRPA1 and acid-sensing ion channels (ASICs). However, it is unclear how lactate modulates the TRPV1 regarded as the main sensor for acidosis in sensory neurons. In this study we investigated the effects of lactate (LA) on recombinant and native TRPV1 channels and on TRPV1-mediated release of neuropeptides from mouse nerves...
November 9, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27826275/non-hierarchical-influence-of-visual-form-touch-and-position-cues-on-embodiment-agency-and-presence-in-virtual-reality
#20
Stephen C Pritchard, Regine Zopf, Vince Polito, David M Kaplan, Mark A Williams
The concept of self-representation is commonly decomposed into three component constructs (sense of embodiment, sense of agency, and sense of presence), and each is typically investigated separately across different experimental contexts. For example, embodiment has been explored in bodily illusions; agency has been investigated in hypnosis research; and presence has been primarily studied in the context of Virtual Reality (VR) technology. Given that each component involves the integration of multiple cues within and across sensory modalities, they may rely on similar underlying mechanisms...
2016: Frontiers in Psychology
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