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dorsal horn neurons

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https://www.readbyqxmd.com/read/28746078/spinal-microglia-are-required-for-long-term-maintenance-of-neuropathic-pain
#1
Stefania Echeverry, Xiang Qun Shi, Mu Yang, Hao Huang, YiChen Wu, Louis-Etienne Lorenzo, Jimena Perez-Sanchez, Robert P Bonin, Yves De Koninck, Ji Zhang
While spinal microglia play a role in early stages of neuropathic pain etiology, whether they are useful targets to reverse chronic pain at late stages remains unknown. Here, we show that microglia activation in the spinal cord persists for >3 months following nerve injury in rodents, beyond involvement of proinflammatory cytokine and chemokine signalling. In this chronic phase, selective depletion of spinal microglia in male rats with the targeted immunotoxin Mac1-saporin and blockade of brain-derived neurotrophic factor-TrkB signalling with intrathecal TrkB Fc chimera, but not cytokine inhibition, almost completely reversed pain hypersensitivity...
June 21, 2017: Pain
https://www.readbyqxmd.com/read/28734869/p2x-receptors-up-regulate-the-cell-surface-expression-of-the-neuronal-glycine-transporter-glyt2
#2
Lucía Villarejo-López, Esperanza Jiménez, David Bartolomé-Martín, Francisco Zafra, Pablo Lapunzina, Carmen Aragón, Beatriz López-Corcuera
Glycinergic inhibitory neurons of the spinal dorsal horn exert critical control over the conduction of nociceptive signals to higher brain areas. The neuronal glycine transporter 2 (GlyT2) is involved in the recycling of synaptic glycine from the inhibitory synaptic cleft and its activity modulates intra and extracellular glycine concentrations. In this report we show that the stimulation of P2X purinergic receptors with βγ-methylene adenosine 5'-triphosphate induces the up-regulation of GlyT2 transport activity by increasing total and plasma membrane expression and reducing transporter ubiquitination...
July 19, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28731982/peripheral-oxytocin-receptors-inhibit-the-nociceptive-input-signal-to-spinal-dorsal-horn-wide-dynamic-range-neurons
#3
Abimael González-Hernández, Alfredo Manzano-García, Guadalupe Martínez-Lorenzana, Irma A Tello-García, Martha Carranza, Carlos Arámburo, Miguel Condés-Lara
Oxytocin has emerged as a mediator of endogenous analgesia in behavioral and electrophysiological experiments. In fact, oxytocin receptors (OTRs) in the spinal dorsal horn participate in a selective inhibition of the neuronal activity mediated by Aδ- and C-fibers but not Aβ-fibers. This study shows that OTRs are expressed in the terminal nerve endings and are able to inhibit nociceptive neuronal firing. Indeed, local peripheral oxytocin blocked the first sensorial activity Aδ- and C-fibers recorded in the spinal cord neurons...
July 19, 2017: Pain
https://www.readbyqxmd.com/read/28730839/trpv1-receptors-contribute-to-mediate-paclitaxel-induced-c-fos-expression-in-spinal-cord-dorsal-horn-neurons
#4
N Kalynovska, P Adamek, J Palecek
Transient receptor potential vanilloid type 1 (TRPV1) receptors are important in the development of different pathological chronic pain states. Here we examined the role of spinal cord TRPV1 receptors in the mechanisms leading to activation of dorsal horn neurons after paclitaxel (PAC) treatment. PAC is a widely used chemotherapeutic drug that often leads to development of painful neuropathy. Immunohistochemical analysis of c-Fos protein expression in dorsal horn neurons was used as a marker of neuronal activation...
July 18, 2017: Physiological Research
https://www.readbyqxmd.com/read/28725185/reticular-formation-and-pain-the-past-and-the-future
#5
REVIEW
Isabel Martins, Isaura Tavares
The involvement of the reticular formation (RF) in the transmission and modulation of nociceptive information has been extensively studied. The brainstem RF contains several areas which are targeted by spinal cord afferents conveying nociceptive input. The arrival of nociceptive input to the RF may trigger alert reactions which generate a protective/defense reaction to pain. RF neurons located at the medulla oblongata and targeted by ascending nociceptive information are also involved in the control of vital functions that can be affected by pain, namely cardiovascular control...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/28720382/activated-leukocyte-cell-adhesion-molecule-is-involved-in-excitatory-synaptic-transmission-and-plasticity-in-the-rat-spinal-dorsal-horn
#6
Eun-Sung Park, Sang-Min Jeon, Haein Weon, Hee-Jung Cho, Dong-Ho Youn
Activated leukocyte cell adhesion molecule (ALCAM), a member of type I transmembrane immunoglobulin superfamily of cell adhesion molecule, is expressed in the surface membrane of various cell types including neurons. In the spinal cord dorsal horn (DH), the first gate for the sensory and pain transmission to the brain, the expression and function of ALCAM have not been known yet. Therefore, we here investigate the synaptic function of ALCAM in the substantia gelatinosa (lamina II) of the spinal DH, as well as its expression in the DH...
July 15, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28718992/melatonin-impedes-tet1-dependent-mglur5-promoter-demethylation-to-relieve-pain
#7
Ming-Chun Hsieh, Yu-Cheng Ho, Cheng-Yuan Lai, Dylan Chou, Hsueh-Hsiao Wang, Gin-Den Chen, Tzer-Bin Lin, Hsien-Yu Peng
Melatonin (N-acetyl-5-methoxytryptamine)/MT2 receptor-dependent epigenetic modification represents a novel pathway in the treatment of neuropathic pain. Because spinal ten-eleven translocation methylcytosine dioxygenase 1 (Tet1)-dependent epigenetic demethylation has recently been linked to pain hypersensitivity, we hypothesized that melatonin/MT2-dependent analgesia involves spinal Tet1-dependent demethylation. Here, we showed that spinal Tet1 gene transfer by intrathecal delivery of Tet1-encoding vectors to naïve rats produced profound and long-lasting nociceptive hypersensitivity...
July 18, 2017: Journal of Pineal Research
https://www.readbyqxmd.com/read/28714352/-express-enhancement-of-spinal-dorsal-horn-neuron-nmda-receptor-phosphorylation-as-the-mechanism-of-remifentanil-induced-hyperalgesia-roles-of-pkc-and-camkii
#8
Sisi Li, Jie Zeng, Xiaoxiao Wan, Ying Yao, Nan Zhao, Yujia Yu, Cong Yu, Zhengyuan Xia
No abstract text is available yet for this article.
January 2017: Molecular Pain
https://www.readbyqxmd.com/read/28708760/reactive-oxygen-species-affect-spinal-cell-type-specific-synaptic-plasticity-in-a-model-of-neuropathic-pain
#9
Alice Bittar, Jaebeom Jun, Jun-Ho La, Jigong Wang, Joong Woo Leem, Jin Mo Chung
Spinal synaptic plasticity is believed to drive central sensitization that underlies the persistent nature of neuropathic pain. Our recent data showed that synaptic plasticity in the dorsal horn is cell type-specific: intense afferent stimulation produced long-term potentiation (LTP) in excitatory spinothalamic tract neurons (STTn), whereas it produced long-term depression (LTD) in inhibitory GABAergic interneurons (GABAn). In addition, reactive oxygen species (ROS) were shown to be involved in LTP in STTn (STTn-LTP) as well as in LTD in GABAn (GABAn-LTD)...
July 11, 2017: Pain
https://www.readbyqxmd.com/read/28706450/reactive-oxygen-species-increase-neuronal-excitability-via-activation-of-nonspecific-cation-channel-in-rat-medullary-dorsal-horn-neurons
#10
Hae In Lee, Byung Rim Park, Sang Woo Chun
The caudal subnucleus of the spinal trigeminal nucleus (medullary dorsal horn; MDH) receives direct inputs from small diameter primary afferent fibers that predominantly transmit nociceptive information in the orofacial region. Recent studies indicate that reactive oxygen species (ROS) is involved in persistent pain, primarily through spinal mechanisms. In this study, we aimed to investigate the role of xanthine/xanthine oxidase (X/XO) system, a known generator of superoxide anion (O2(·-)), on membrane excitability in the rat MDH neurons...
July 2017: Korean Journal of Physiology & Pharmacology
https://www.readbyqxmd.com/read/28700536/fully-implantable-battery-free-wireless-optoelectronic-devices-for-spinal-optogenetics
#11
Vijay K Samineni, Jangyeol Yoon, Kaitlyn E Crawford, Yu Ra Jeong, Kajanna C McKenzie, Gunchul Shin, Zhaoqian Xie, Saranya S Sundaram, Yuhang Li, Min Young Yang, Jeonghyun Kim, Di Wu, Yeguang Xue, Xue Feng, Yonggang Huang, Aaron D Mickle, Anthony Banks, Jeong Sook Ha, Judith P Golden, John A Rogers, Robert W Gereau
The advent of optogenetic tools has allowed unprecedented insights into the organization of neuronal networks. Although recently developed technologies have enabled implementation of optogenetics for studies of brain function in freely moving, untethered animals, wireless powering and device durability pose challenges in studies of spinal cord circuits where dynamic, multidimensional motions against hard and soft surrounding tissues can lead to device degradation. We demonstrate here a fully implantable optoelectronic device powered by near-field wireless communication technology, with a thin and flexible open architecture that provides excellent mechanical durability, robust sealing against biofluid penetration and fidelity in wireless activation, thereby allowing for long-term optical stimulation of the spinal cord without constraint on the natural behaviors of the animals...
June 8, 2017: Pain
https://www.readbyqxmd.com/read/28700081/spinal-nociceptive-circuit-analysis-with-recombinant-adeno-associated-viruses-the-impact-of-serotypes-and-promoters
#12
Karen Haenraets, Edmund Foster, Helge Johannssen, Vinnie Kandra, Noemie Frezel, Timothy Steffen, Valeria Jaramillo, Jean-Charles Paterna, Hanns Ulrich Zeilhofer, Hendrik Wildner
Recombinant adeno-associated virus (rAAV) vector-mediated gene transfer into genetically defined neuron subtypes has become a powerful tool to study the neuroanatomy of neuronal circuits in the brain and to unravel their functions. More recently this methodology has also become popular for the analysis of spinal cord circuits. To date a variety of naturally occurring AAV serotypes and genetically modified capsid variants are available but transduction efficiency in spinal neurons, target selectivity and the ability for retrograde tracing are only incompletely characterized...
July 12, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28680103/chemogenetic-silencing-of-gabaergic-dorsal-horn-interneurons-induces-morphine-resistant-spontaneous-nocifensive-behaviours
#13
Keisuke Koga, Kensho Kanehisa, Yuta Kohro, Miho Shiratori-Hayashi, Hidetoshi Tozaki-Saitoh, Kazuhide Inoue, Hidemasa Furue, Makoto Tsuda
Inhibitory interneurons in the spinal dorsal horn (SDH) are crucial for processing somatosensory information originating in the periphery. However, the effects of the acute and selective inactivation of GABAergic SDH interneurons on pain processing are not fully understood. In this study, we used designer receptors exclusively activated by designer drugs (DREADD) technology and vesicular GABA transporter-Cre (Vgat-Cre) mice to selectively express a modified human muscarinic Gi protein-coupled receptor (hM4Di) in Vgat-Cre (+) GABAergic SDH interneurons in the fourth lumbar segment...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28673722/involvement-of-substance-p-in-the-antinociceptive-effect-of-botulinum-toxin-type-a-evidence-from-knockout-mice
#14
Ivica Matak, Valéria Tékus, Kata Bölcskei, Zdravko Lacković, Zsuzsanna Helyes
The antinociceptive action of botulinum toxin type A (BoNT/A) has been demonstrated in behavioral animal studies and clinical settings. It was shown that this effect is associated with toxin activity in CNS, however, the mechanism is not fully understood. Substance P (SP) is one of the dominant neurotransmitters in primary afferent neurons transmitting pain and itch. Thus, here we examined association of SP-mediated transmission and BoNT/A antinociceptive action by employing gene knockouts. Antinociceptive activity of intraplantarly (i...
July 1, 2017: Neuroscience
https://www.readbyqxmd.com/read/28673596/intra-spinal-microstimulation-may-alleviate-chronic-pain-after-spinal-cord-injury
#15
Bin Shu, Fei Yang, Yun Guan
Chronic pain after spinal cord injury (SCI) is a form of central neuropathic pain that is debilitating and often refractory to current pharmacological treatments. Neurostimulation pain therapies, such as epidural spinal cord stimulation, have only moderate success in reducing SCI pain. The pathogenesis of SCI pain may involve a state of central neuronal hyperexcitability, especially in the spinal cord dorsal horn, that develops after injury. We hypothesize that the neuronal structures near the spinal cord injury site may be an important pain generator, and intraspinal microstimulation (ISMS) may normalize dorsal horn neuronal hyperexcitability and hence alleviate SCI pain...
July 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28663117/bortezomib-induces-neuropathic-pain-through-protein-kinase-c-mediated-activation-of-presynaptic-nmda-receptors-in-the-spinal-cord
#16
Jing-Dun Xie, Shao-Rui Chen, Hong Chen, Hui-Lin Pan
Chemotherapeutic drugs, including bortezomib, often cause painful peripheral neuropathy, which is a severe dose-limiting adverse effect experienced by many cancer patients. The glutamate N-methyl-d-aspartate receptors (NMDARs) at the spinal cord level are critically involved in the synaptic plasticity associated with neuropathic pain. In this study, we determined whether treatment with bortezomib, a proteasome inhibitor, affects the NMDAR activity of spinal dorsal horn neurons. Systemic treatment with bortezomib in rats did not significantly affect postsynaptic NMDAR currents elicited by puff application of NMDA directly to dorsal horn neurons...
June 27, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28663089/sinomenine-produces-peripheral-analgesic-effects-via-inhibition-of-voltage-gated-sodium-currents
#17
Jeong-Yun Lee, Seo-Yeon Yoon, Jonghwa Won, Han-Byul Kim, Youngnam Kang, Seog Bae Oh
Sinomenium acutum has been used in traditional medicine to treat a painful disease such as rheumatic arthritis and neuralgia. Sinomenine, which is a main bioactive ingredient in Sinomenium acutum, has been reported to have an analgesic effect in diverse pain animal models. However little is known about the detailed mechanisms underlying peripheral analgesic effect of sinomenine. In the present study, we aimed to elucidate its cellular mechanism by using formalin-induced acute inflammatory pain model in mice...
June 27, 2017: Neuroscience
https://www.readbyqxmd.com/read/28663035/inhibition-of-interleukin-6-function-attenuates-the-central-sensitization-and-pain-behavior-induced-by-osteoarthritis
#18
Yuangui Lin, Lian Liu, Haixia Jiang, Jieshu Zhou, Yuying Tang
Chronic pain is the most prominent and disabling symptom in the patients with osteoarthritis (OA), and the underlying mechanism largely remains unclear. Interleukin-6 (IL-6), a proinflammatory cytokine, is critically involved in the development and maintenance of central sensitization in several rodent models of chronic pain. The present study aims to elucidate the IL-6 mediated neurological adaptation in dorsal horn in the rat with monosodium iodoacetate (MIA) -induced OA. Significant upregulation of IL-6 expression was detected in the dorsal horn in the modeled rats...
June 26, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28656207/expression-of-granulocyte-colony-stimulating-factor-3-receptor-in-the-spinal-dorsal-horn-following-spinal-nerve-ligation-induced-neuropathic-pain
#19
Enji Zhang, Sunyeul Lee, Min-Hee Yi, Yongshan Nan, Yinshi Xu, Nara Shin, Youngkwon Ko, Young Ho Lee, Wonhyung Lee, Dong Woon Kim
In previous studies that have profiled gene expression in patients with complex regional pain syndrome (CRPS), the expression of granulocyte colony-stimulating factor 3 receptor (G‑CSFR) was elevated, as were a number of pain‑associated genes. The present study determined the expression of G‑CSFR and the mechanisms by which it may affect hypersensitivity, focusing on the signal transducer and activator of transcription 3 (STAT3)/transient receptor potential cation channel subfamily V 1 (TRPV1) signaling pathway in particular, which is an important mediator of pain...
August 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28649695/neuronal-aromatase-expression-in-pain-processing-regions-of-the-medullary-and-spinal-cord-dorsal-horn
#20
May Tran, Julia A Kuhn, João M Bráz, Allan I Basbaum
In both acute and chronic pain conditions, women tend to be more sensitive than men. This sex difference may be regulated by estrogens, such as estradiol, that are synthesized in the spinal cord and brainstem and act locally to influence pain processing. To identify a potential cellular source of local estrogen, here we examined the expression of aromatase, the enzyme that catalyzes the conversion of testosterone to estradiol. Our studies focused on primary afferent neurons and on their central targets in the spinal cord and medulla as well as in the nucleus of the solitary tract, the target of nodose ganglion-derived visceral afferents...
June 26, 2017: Journal of Comparative Neurology
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