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Dorsal root ganglion

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https://www.readbyqxmd.com/read/28306698/oral-application-of-magnesium-l-threonate-attenuates-vincristine-induced-allodynia-and-hyperalgesia-by-normalization-of-tumor-necrosis-factor-%C3%AE-nuclear-factor-%C3%AE%C2%BAb-signaling
#1
Ting Xu, Dai Li, Xin Zhou, Han-Dong Ouyang, Li-Jun Zhou, Hang Zhou, Hong-Mei Zhang, Xu-Hong Wei, Guosong Liu, Xian-Guo Liu
BACKGROUND: Antineoplastic agents, including vincristine, often induce neuropathic pain and magnesium deficiency clinically, but the causal link between them has not been determined. No drug is available for treating this form of neuropathic pain. METHODS: Injection of vincristine (0.1 mg · kg · day, intraperitoneally, for 10 days) was used to induce nociceptive sensitization, which was accessed with von Frey hairs and the plantar tester in adult male Sprague-Dawley rats...
March 17, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28301400/the-role-of-calcitonin-gene-related-peptide-in-peripheral-and-central-pain-mechanisms-including-migraine
#2
Smriti Iyengar, Michael H Ossipov, Kirk W Johnson
Calcitonin gene-related peptide (CGRP) is a 37-amino acid peptide found primarily in the C and Aδ sensory fibers arising from the dorsal root and trigeminal ganglia, as well as the central nervous system. Calcitonin gene-related peptide was found to play important roles in cardiovascular, digestive, and sensory functions. Although the vasodilatory properties of CGRP are well documented, its somatosensory function regarding modulation of neuronal sensitization and of enhanced pain has received considerable attention recently...
April 2017: Pain
https://www.readbyqxmd.com/read/28286117/carvedilol-prevents-functional-deficits-in-peripheral-nerve-mitochondria-of-rats-with-oxaliplatin-evoked-painful-peripheral-neuropathy
#3
Aparna Areti, Prashanth Komirishetty, Ashutosh Kumar
Oxaliplatin use as chemotherapeutic agent is frequently limited by cumulative neurotoxicity which may compromise quality of life. Reports relate this neurotoxic effect to oxidative stress and mitochondrial dysfunction in peripheral nerves and dorsal root ganglion (DRG). Carvedilol is an antihypertensive drug, has also been appreciated for its antioxidant and mitoprotective properties. Carvedilol co-treatment did not reduce the anti-tumor effects of oxaliplatin in human colon cancer cells (HT-29), but exhibited free radical scavenging activity against oxaliplatin-induced oxidative stress in neuronal cells (Neuro-2a)...
March 9, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28283888/kinin-receptors-sensitize-trpv4-channel-and-induce-mechanical-hyperalgesia-relevance-to-paclitaxel-induced-peripheral-neuropathy-in-mice
#4
Robson Costa, Maíra A Bicca, Marianne N Manjavachi, Gabriela C Segat, Fabiana Chaves Dias, Elizabeth S Fernandes, João B Calixto
Kinin B1 (B1R) and B2 receptors (B2R) and the transient receptor potential vanilloid 4 (TRPV4) channel are known to play a critical role in the peripheral neuropathy induced by paclitaxel (PTX) in rodents. However, the downstream pathways activated by kinin receptors as well as the sensitizers of the TRPV4 channel involved in this process remain unknown. Herein, we investigated whether kinins sensitize TRPV4 channels in order to maintain PTX-induced peripheral neuropathy in mice. The mechanical hyperalgesia induced by bradykinin (BK, a B2R agonist) or des-Arg(9)-BK (DABK, a B1R agonist) was inhibited by the selective TRPV4 antagonist HC-067047...
March 10, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28283839/selective-phosphodiesterase-2a-inhibitor-alleviates-radicular-inflammation-and-mechanical-allodynia-in-non-compressive-lumbar-disc-herniation-rats
#5
Jun-Nan Wang, Xue-Jun Zhao, Zhi-Hua Liu, Xu-Li Zhao, Tao Sun, Zhi-Jian Fu
PURPOSE: Phosphodiesterase inhibitors possess anti-inflammatory properties. In addition, some studies report that phosphodiesterase 2A (PDE2A) are highly expressed in the dorsal horn of the spinal cord. The present study aimed to investigate whether intrathecal administration of Bay 60-7550, a specific PDE2A inhibitor, could alleviate mechanical allodynia in non-compressive lumbar disc herniation (NCLDH) rats. METHODS: Rat NCLDH models by autologous nucleus pulposus implantation to dorsal root ganglion were established...
March 10, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28277328/isobolographic-analysis-of-drug-combinations-with-intrathecal-brl52537-%C3%AE%C2%BA-opioid-agonist-pregabalin-calcium-channel-modulator-af-353-p2x3-receptor-antagonist-and-a804598-p2x7-receptor-antagonist-in-neuropathic-rats
#6
Young-Hwan Jung, Yeo Ok Kim, Jung Hyun Han, Yong-Chul Kim, Myung Ha Yoon
BACKGROUND: Neuropathic pain should be treated with drug combinations exhibiting multiple analgesic mechanisms of action because the mechanism of neuropathic pain involves multiple physiological causes and is mediated by multiple pathways. In this study, we defined the pharmacological interaction of BRL52537 (κ-opioid agonist), pregabalin (calcium channel modulator), AF 353 (P2X3 receptor antagonist), and A804598 (P2X7 receptor antagonist). METHODS: Animal models of neuropathic pain were established by spinal nerve ligation (SNL) in male Sprague-Dawley rats, and responses to the mechanical stimulation using von Frey filaments were measured...
March 8, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28276474/multiunit-activity-based-real-time-limb-state-estimation-from-dorsal-root-ganglion-recordings
#7
Sungmin Han, Jun-Uk Chu, Hyungmin Kim, Jong Woong Park, Inchan Youn
Proprioceptive afferent activities could be useful for providing sensory feedback signals for closed-loop control during functional electrical stimulation (FES). However, most previous studies have used the single-unit activity of individual neurons to extract sensory information from proprioceptive afferents. This study proposes a new decoding method to estimate ankle and knee joint angles using multiunit activity data. Proprioceptive afferent signals were recorded from a dorsal root ganglion with a single-shank microelectrode during passive movements of the ankle and knee joints, and joint angles were measured as kinematic data...
March 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28274075/herpes-zoster-with-post-herpetic-neuralgia-involving-the-right-maxillary-branch-of-trigeminal-nerve-a-case-report-and-review-of-literature
#8
Massillamani Francis, Kailasam Subramanian, S Leena Sankari, Venkata Lakshmi Aparna Potluri, Akila Prabakaran
Herpes Zoster (HZ) is an acute, self-limiting, neuro cutaneous viral infection caused by the reactivation of the Varicella Zoster Virus (VZV) that remains latent in the dorsal root ganglion. About 50% of occurrence is seen in older age groups and immunocompromised patients. Less than 5% occur in children. HZ is characterized by the unilateral pain, burning and tingling sensation followed by the vesicular eruptions limited to the single dermatome that are innervated by the single cranial ganglion, sometimes it leads to Post Herpetic Neuralgia (PHN)...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28271659/effects-of-electroacupuncture-at-2-and-100-hz-on-rat-type-2-diabetic-neuropathic-pain-and-hyperalgesia-related-protein-expression-in-the-dorsal-root-ganglion
#9
Xiao-Fen He, Jun-Jun Wei, Sheng-Yun Shou, Jian-Qiao Fang, Yong-Liang Jiang
OBJECTIVE: To investigate the analgesic effects of electroacupuncture (EA) at 2 and 100 Hz on type 2 diabetic neuropathic pain (DNP) and on the expressions of the P2X3 receptor and calcitonin gene-related peptide (CGRP) in the dorsal root ganglion (DRG). METHODS: Rat type 2 DNP was induced by a high calorie and high sugar diet fed for 7 weeks, plus a single intraperitoneal injection of streptozotocin (STZ) after 5 weeks. EA at 2 and 100 Hz was carried out once every day after 7 weeks for 7 consecutive days...
2017: Journal of Zhejiang University. Science. B
https://www.readbyqxmd.com/read/28270689/dna-methyltransferase-dnmt3a-contributes-to-neuropathic-pain-by-repressing-kcna2-in-primary-afferent-neurons
#10
Jian-Yuan Zhao, Lingli Liang, Xiyao Gu, Zhisong Li, Shaogen Wu, Linlin Sun, Fidelis E Atianjoh, Jian Feng, Kai Mo, Shushan Jia, Brianna Marie Lutz, Alex Bekker, Eric J Nestler, Yuan-Xiang Tao
Nerve injury induces changes in gene transcription in dorsal root ganglion (DRG) neurons, which may contribute to nerve injury-induced neuropathic pain. DNA methylation represses gene expression. Here, we report that peripheral nerve injury increases expression of the DNA methyltransferase DNMT3a in the injured DRG neurons via the activation of the transcription factor octamer transcription factor 1. Blocking this increase prevents nerve injury-induced methylation of the voltage-dependent potassium (Kv) channel subunit Kcna2 promoter region and rescues Kcna2 expression in the injured DRG and attenuates neuropathic pain...
March 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28267067/hdac6-inhibition-effectively-reverses-chemotherapy-induced-peripheral-neuropathy
#11
Karen Krukowski, Jiacheng Ma, Olga Golonzhka, Geoffroy O Laumet, Tanuja Gutti, John H van Duzer, Ralph Mazitschek, Matthew B Jarpe, Cobi J Heijnen, Annemieke Kavelaars
Chemotherapy-induced peripheral neuropathy is one of the most common doselimiting side-effects of cancer treatment. Currently, there is no FDA-approved treatment available. Histone deacetylase 6 (HDAC6) is a microtubule-associated deacetylase whose function includes regulation of á-tubulin-dependent intracellular mitochondrial transport. Here we examined the effect of HDAC6 inhibition on established cisplatin-induced peripheral neuropathy. We used a novel HDAC6 inhibitor ACY-1083, which shows 260-fold selectivity towards HDAC6 versus other HDACs...
March 4, 2017: Pain
https://www.readbyqxmd.com/read/28263785/nociceptive-neuronal-fc-gamma-receptor-i-is-involved-in-igg-immune-complex-induced-pain-in-the-rat
#12
Haowu Jiang, Xinhua Shen, Zhiyong Chen, Fan Liu, Tao Wang, Yikuan Xie, Chao Ma
Antigen-specific immune diseases such as rheumatoid arthritis are often accompanied by pain and hyperalgesia. Our previous studies have demonstrated that Fc-gamma-receptor type I (FcγRI) is expressed in a subpopulation of rat dorsal root ganglion (DRG) neurons and can be directly activated by IgG immune complex (IgG-IC). In this study we investigated whether neuronal FcγRI contributes to antigen-specific pain in the naïve and rheumatoid arthritis model rats. In vitro calcium imaging and whole-cell patch clamp recordings in dissociated DRG neurons revealed that only the small-, but not medium- or large-sized DRG neurons responded to IgG-IC...
March 2, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28260107/cytoprotective-effects-of-myristicin-against-hypoxia%C3%A2-induced-apoptosis-and-endoplasmic-reticulum-stress-in-rat-dorsal-root-ganglion-neurons
#13
Quanlai Zhao, Chen Liu, Xiang Shen, Liang Xiao, Hong Wang, Ping Liu, Lingting Wang, Hongguang Xu
The aim of the present study was to investigate the role of myristicin (Myr; 1‑allyl‑5‑methoxy‑3,4‑methylenedioxybenzene), an active aromatic compound isolated from nutmeg, carrot, basil, cinnamon and parsley, in hypoxia‑induced apoptosis in rat dorsal root ganglion (DRG) neurons. It was observed that Myr significantly enhanced cell viability in hypoxia‑induced DRG neurons in a dose‑dependent manner; the optimal concentration of Myr was 50 µM. Furthermore, Myr reduced the percentage of deoxynucleotidyl transferase‑mediated dUTP nick end‑labeling‑positive neuronal cells and influenced the expression of the pro‑apoptotic gene B‑cell lymphoma 2 (Bcl‑2) associated X protein, the apoptosis protease cleaved caspase‑3 and the anti‑apoptotic gene Bcl‑2, in the hypoxia‑induced group...
February 28, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28258808/alendronate-inhibits-hyperalgesia-and-suppresses-neuropeptide-markers-of-pain-in-a-mouse-model-of-osteoporosis
#14
Yohei Naito, Hiroki Wakabayashi, Sho Kato, Taro Nakagawa, Takahiro Iino, Akihiro Sudo
BACKGROUND: Chronic back pain is one of the most important complications of postmenopausal osteoporosis. The aim of this study was to evaluate skeletal pain associated with osteoporosis and to examine the inhibitory effect of bisphosphonates (BPs) on pain in ovariectomized (OVX) mice. The mechanism of osteoporotic pain in OVX mice was evaluated through an examination of pain-related behavior, as well as immunohistochemical findings. In addition, the effects of alendronate (ALN), a potent osteoclast inhibitor, on these parameters were assessed...
February 28, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28254884/a-functional-coupling-between-crmp1-and-nav1-7-for-retrograde-propagation-of-semaphorin3a-signaling
#15
Masayuki Yamane, Naoya Yamashita, Tomonobu Hida, Yoshinori Kamiya, Fumio Nakamura, Pappachan Kolattukudy, Yoshio Goshima
Semaphorin3A (Sema3A) is a secreted type of axon guidance molecules that regulates axon wiring through neuropilin-1 (NRP1) and PlexinAs (PlexAs) receptor complex. Sema3A regulates the dendritic branching through a tetrodotoxin (TTX)-sensitive retrograde axonal transport of PlexAs and Tropomyosin-related kinase A (TrkA) complex. We here demonstrate that Nav1.7, a TTX-sensitive Na(+) channel, by coupling with collapsin response mediator protein 1 (CRMP1), mediates the Sema3A-induced retrograde transport. In mouse dorsal root ganglion (DRG) neurons, Sema3A increased co-localization of PlexA4 and TrkA in the growth cones and axons...
March 2, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28253350/sox10-contributes-to-the-balance-of-fate-choice-in-dorsal-root-ganglion-progenitors
#16
Mariana Delfino-Machín, Romain Madelaine, Giorgia Busolin, Masataka Nikaido, Sarah Colanesi, Karen Camargo-Sosa, Edward W P Law, Stefano Toppo, Patrick Blader, Natascia Tiso, Robert N Kelsh
The development of functional peripheral ganglia requires a balance of specification of both neuronal and glial components. In the developing dorsal root ganglia (DRGs), these components form from partially-restricted bipotent neuroglial precursors derived from the neural crest. Work in mouse and chick has identified several factors, including Delta/Notch signaling, required for specification of a balance of these components. We have previously shown in zebrafish that the Sry-related HMG domain transcription factor, Sox10, plays an unexpected, but crucial, role in sensory neuron fate specification in vivo...
2017: PloS One
https://www.readbyqxmd.com/read/28250634/sudden-death-and-cervical-spine-a-new-contribution-to-pathogenesis-for-sudden-death-in-critical-care-unit-from-subarachnoid-hemorrhage-first-report-an-experimental-study
#17
Hizir Kazdal, Ayhan Kanat, Mehmet Dumlu Aydin, Ugur Yazar, Ali Riza Guvercin, Muhammet Calik, Betul Gundogdu
CONTEXT: Sudden death from subarachnoid hemorrhage (SAH) is not uncommon. AIMS: The goal of this study is to elucidate the effect of the cervical spinal roots and the related dorsal root ganglions (DRGs) on cardiorespiratory arrest following SAH. SETTINGS AND DESIGN: This was an experimental study conducted on rabbits. MATERIALS AND METHODS: This study was conducted on 22 rabbits which were randomly divided into three groups: control (n = 5), physiologic serum saline (SS; n = 6), SAH groups (n = 11)...
January 2017: Journal of Craniovertebral Junction and Spine
https://www.readbyqxmd.com/read/28248888/comparison-between-bipolar-pulsed-radiofrequency-and-monopolar-pulsed-radiofrequency-in-chronic-lumbosacral-radicular-pain-a-randomized-controlled-trial
#18
Min Cheol Chang, Yun Woo Cho, Sang Ho Ahn
BACKGROUND: Chronic lumbosacral radicular pain is a challenging medical problem with respect to therapeutic management. Many patients with lumbosacral radicular pain complain of persistent leg pain after transforaminal epidural steroid injection. Nowadays, pulsed radiofrequency (PRF) stimulation on the dorsal root ganglion (DRG) is widely used for controlling lumbosacral radicular pain. METHODS: We evaluated the effect of bipolar PRF on the DRG for the management of lumbosacral radicular pain...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28243141/bay11-7082-attenuates-neuropathic-pain-via-inhibition-of-nuclear-factor-kappa-b-and-nucleotide-binding-domain-like-receptor-protein-3-inflammasome-activation-in-dorsal-root-ganglions-in-a-rat-model-of-lumbar-disc-herniation
#19
Ailiang Zhang, Kun Wang, Lianghua Ding, Xinnan Bao, Xuan Wang, Xubin Qiu, Jinbo Liu
Lumbar disc herniation (LDH) is an important cause of radiculopathy, but the underlying mechanisms are incompletely understood. Many studies suggested that local inflammation, rather than mechanical compression, results in radiculopathy induced by LDH. On the molecular and cellular level, nuclear factor-kappa B (NF-κB) and nucleotide-binding domain-like receptor protein 3 (NLRP3) inflammasome have been implicated in the regulation of neuroinflammation formation and progression. In this study, the autologous nucleus pulposus (NP) was implanted in the left L5 dorsal root ganglion (DRG) to mimic LDH in rats...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28243090/an-in-vivo-mechanism-for-the-reduced-peripheral-neurotoxicity-of-nk105-a-paclitaxel-incorporating-polymeric-micellar-nanoparticle-formulation
#20
Iwao Nakamura, Eiji Ichimura, Rika Goda, Hitomi Hayashi, Hiroko Mashiba, Daichi Nagai, Hirofumi Yokoyama, Takeshi Onda, Akira Masuda
In our previous rodent studies, the paclitaxel (PTX)-incorporating polymeric micellar nanoparticle formulation NK105 had showed significantly stronger antitumor effects and reduced peripheral neurotoxicity than PTX dissolved in Cremophor(®) EL and ethanol (PTX/CRE). Thus, to elucidate the mechanisms underlying reduced peripheral neurotoxicity due to NK105, we performed pharmacokinetic analyses of NK105 and PTX/CRE in rats. Among neural tissues, the highest PTX concentrations were found in the dorsal root ganglion (DRG)...
2017: International Journal of Nanomedicine
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