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dorsal root ganglion stimulation

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https://www.readbyqxmd.com/read/28101174/protective-effects-of-resveratrol-on-autologous-nucleus-pulposus-model-of-radiculopathy
#1
Bin Lin, Hui Yu, Yongzhi He, Yang Xu, Wenbin Zhang, Chengwu Lu, Qingfang Ao
Nucleus pulposus (NP) has been suggested to trigger an autoimmune response if exposed to the immune system, which plays a key role in neuropathic pain. Therefore, appropriate suppression of inflammation is a key factor for treating the radiculopathy caused by intervertebral disk (IVD) degeneration. Resveratrol, a key component of red wine, has been suggested to exhibit anti-inflammatory properties in vitro and in vivo. However, the effects of resveratrol on NP-mediated pain in vivo have not been studied. The aim of the present study was to investigate whether resveratrol may be useful in treating NP-mediated pain in an autologous NP model of radiculopathy...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28096474/junb-regulates-angiogenesis-and-neurovascular-parallel-alignment-in-mouse-embryonic-skin
#2
Yasuo Yoshitomi, Takayuki Ikeda, Hidehito Saito, Yoshino Yoshitake, Yasuhito Ishigaki, Toshihisa Hatta, Nobuo Kato, Hideto Yonekura
Blood vessels and nerve fibers are often closely arranged in parallel throughout the body. Therefore, neurovascular interactions have been suggested to be important for the development of vascular networks. However, the molecular mechanisms and genes regulating this process remain unclear. In the present study, we investigated the genes that are activated in endothelial cells (ECs) following interactions with neurons during vascular development. Microarray analyses of human primary microvascular ECs co-cultured with mouse primary dorsal root ganglion cells showed that JunB is strongly upregulated in ECs by neurovascular interactions...
January 17, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28089870/large-dense-core-vesicle-exocytosis-from-mouse-dorsal-root-ganglion-neurons-is-regulated-by-neuropeptide-y
#3
Anneka Bost, Ali H Shaib, Yvonne Schwarz, Barbara A Niemeyer, Ute Becherer
Peptidergic dorsal root ganglion (DRG) neurons transmit sensory and nociceptive information from the periphery to the central nervous system. Their synaptic activity is profoundly affected by neuromodulatory peptides stored and released from large dense-core vesicles (LDCVs). However, the mechanism of peptide secretion from DRG neurons is poorly understood. Using total internal reflection fluorescence microscopy (TIRFM), we visualized individual LDCVs loaded with fluorescent neuropeptide Y (NPY) and analyzed their stimulation-dependent release...
January 12, 2017: Neuroscience
https://www.readbyqxmd.com/read/28079752/changes-in-dorsal-root-ganglion-gene-expression-in-response-to-spinal-cord-stimulation
#4
Dana M Tilley, David L Cedeño, Courtney A Kelley, Margaret DeMaegd, Ramsin Benyamin, Ricardo Vallejo
BACKGROUND AND OBJECTIVES: Spinal cord stimulation (SCS) has been shown to influence pain-related genes in the spinal cord directly under the stimulating electrodes. There is limited information regarding changes occurring at the dorsal root ganglion (DRG). This study evaluates gene expression in the DRG in response to SCS therapy. METHODS: Rats were randomized into experimental or control groups (n = 6 per group). Experimental animals underwent spared-nerve injury, implantation of lead, and continuous SCS (72 hours)...
January 11, 2017: Regional Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/28030470/dorsal-root-ganglion-stimulation-yielded-higher-treatment-success-rate-for-crps-and-causalgia-at-3-and-12-months-randomized-comparative-trial
#5
Timothy R Deer, Robert M Levy, Jeffrey Kramer, Lawrence Poree, Kasra Amirdelfan, Eric Grigsby, Peter Staats, Allen W Burton, Abram H Burgher, Jon Obray, James Scowcroft, Stan Golovac, Leonardo Kapural, Richard Paicius, Christopher Kim, Jason Pope, Thomas Yearwood, Sam Samuel, W Porter McRoberts, Hazmer Cassim, Mark Netherton, Nathan Miller, Michael Schaufele, Edward Tavel, Timothy Davis, Kristina Davis, Linda Johnson, Nagy Mekhail
Animal and human studies indicate that electrical stimulation of DRG neurons may modulate neuropathic pain signals.ACCURATE, a pivotal, prospective, multi-center, randomized-comparative effectiveness trial, was conducted in 152 subjects diagnosed with complex regional pain syndrome (CRPS) or causalgia in the lower extremities. Subjects received neurostimulation of the DRG or dorsal column (SCS). The primary endpoint was a composite of safety and efficacy at 3 months and subjects were assessed through 12 months for long term outcomes and adverse events...
December 23, 2016: Pain
https://www.readbyqxmd.com/read/28009062/cytokine-therapy-mediated-neuroprotection-in-a-friedreich-s-ataxia-mouse-model
#6
Kevin C Kemp, Nadia Cerminara, Kelly Hares, Juliana Redondo, Amelia J Cook, Harry R Haynes, Bronwen R Burton, Mark Pook, Richard Apps, Neil J Scolding, Alastair Wilkins
OBJECTIVES: Friedreich's ataxia is a devastating neurological disease currently lacking any proven treatment. We studied the neuro-protective effects of the cytokines granulocyte-colony stimulating factor and stem cell factor in a humanised murine model of Friedreich's ataxia. METHODS: Mice received monthly subcutaneous infusions of cytokines while also being assessed at monthly time points using an extensive range of behavioural motor performance tests. After 6 months of treatment, neurophysiological evaluation of both sensory and motor nerve conduction was performed...
December 23, 2016: Annals of Neurology
https://www.readbyqxmd.com/read/27984207/acquired-exchange-protein-directly-activated-by-cyclic-adenosine-monophosphate-activity-induced-by-p38-mitogen-activated-protein-kinase-in-primary-afferent-neurons-contributes-to-sustaining-postincisional-nociception
#7
Megumi Matsuda, Kentaro Oh-Hashi, Isao Yokota, Teiji Sawa, Fumimasa Amaya
BACKGROUND: The molecular mechanisms responsible for sustained pain after tissue injury are largely unknown. The aim of this study was to clarify the role of exchange protein directly activated by cyclic adenosine monophosphate (EPAC) in sustained postincisional nociception, using tissue injury-induced nociceptor priming, and involvement of p38 mitogen-activated protein kinase (p38MAPK) in EPAC-mediated nociceptor priming. METHODS: Plantar incisions were made in the hind paws of Sprague-Dawley rats (n = 144)...
January 2017: Anesthesiology
https://www.readbyqxmd.com/read/27906951/changes-in-neuroglial-activity-in-multiple-spinal-segments-after-caudal-epidural-pulsed-radiofrequency-in-a-rat-model-of-lumbar-disc-herniation
#8
Hee Kyung Cho, Jae Hoon Kang, So-Yeon Kim, Mi-Jung Choi, Se Jin Hwang, Yun-Woo Cho, Sang-Ho Ahn
BACKGROUND: Herniated lumbar discs can induce sciatica by mechanical compression and/or chemical irritation. It was recently reported that neuroglial cellular activity after pulsed radiofrequency (PRF) application to a single dorsal root ganglion (DRG) attenuated neuroglial activity at the corresponding spinal dorsal horn. Recently, caudal epidural PRF has been used to manage neuropathic pain, but evidence of molecular changes after the administration of caudal epidural PRF to attenuate neuropathic pain is lacking, and it has not been determined whether caudal epidural PRF affects neuroglial activity at different spinal levels...
November 2016: Pain Physician
https://www.readbyqxmd.com/read/27900578/potential-mechanism-of-neurite-outgrowth-enhanced-by-electrical-stimulation-involvement-of-microrna-363-5p-targeting-dclk1-expression-in-rat
#9
Xin Quan, Liangliang Huang, Yafeng Yang, Teng Ma, Zhongyang Liu, Jun Ge, Jinghui Huang, Zhuojing Luo
Electrical stimulation (ES) promotes neurite outgrowth and nerve regeneration, but the underlying mechanisms remain undefined. In the present study, we investigated the role of micro RNAs (miRNAs) in ES-mediated neurite outgrowth. First, we performed microarray analyses to identify changes in the miRNAs profile of dorsal root ganglion neurons (DRGNs) following ES. The expression of 16 known miRNAs was altered by ES. Bioinformatics showed that the potential targets of these differentially expressed miRNAs were involved in neurite outgrowth...
November 30, 2016: Neurochemical Research
https://www.readbyqxmd.com/read/27876655/dorsal-root-ganglion-stimulation-attenuates-the-bold-signal-response-to-noxious-sensory-input-in-specific-brain-regions-insights-into-a-possible-mechanism-for-analgesia
#10
Christopher P Pawela, Jeffery M Kramer, Quinn H Hogan
Targeted dorsal root ganglion (DRG) electrical stimulation (i.e. ganglionic field stimulation - GFS) is an emerging therapeutic approach to alleviate chronic pain. Here we describe blood oxygen-level dependent (BOLD) functional magnetic resonance imaging (fMRI) responses to noxious hind-limb stimulation in a rat model that replicates clinical GFS using an electrode implanted adjacent to the DRG. Acute noxious sensory stimulation in the absence of GFS caused robust BOLD fMRI response in brain regions previously associated with sensory and pain-related response, such as primary/secondary somatosensory cortex, retrosplenial granular cortex, thalamus, caudate putamen, nucleus accumbens, globus pallidus, and amygdala...
November 20, 2016: NeuroImage
https://www.readbyqxmd.com/read/27825405/effects-of-chinese-medicinal-compound-jinmaitong-on-the-expression-of-nitrotyrosine-andnerve-growth-factor-in-the-dorsal-root-ganglia-of-diabetic-rats
#11
Ya-Nan Wu, Xiao-Chun Liang, Dan Yang, Ling Qu, Wei Liu, Yun-Zhou Gao
Objective To study the effects of Chinese medicinal compound Jinmaitong(JMT) on the expressions of nitrotyrosine (NT) and nerve growth factor (NGF) in dorsal root ganglia of diabetic rats. Methods Experimental rat diabetic models were established by the intraperitoneal injection of streptozotocin. Rat models were then randomly divided into four groups including normal control group (Con group),diabetes mellitus group (DM group),Jinmaitong group(JMT group)(treated with JMT similar to the fifteen-fold dose of adult recommended dosage),and taurine group(Tau group)(treated with Taurine similar to the fifteen-fold dose of adult recommended dosage),with 10 rats in each group...
October 10, 2016: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/27802438/bradykinin-contributes-to-sympathetic-and-pressor-responses-evoked-by-activation-of-skeletal-muscle-afferents-p2x-in-heart-failure
#12
Jihong Xing, Jianhua Li
BACKGROUND/AIMS: Published data suggest that purinergic P2X receptors of muscle afferent nerves contribute to the enhanced sympathetic nervous activity (SNA) and blood pressure (BP) responses during static exercise in heart failure (HF). In this study, we examined engagement of bradykinin (BK) in regulating responses of SNA and BP evoked by P2X stimulation in rats with HF. We further examined cellular mechanisms responsible for BK. We hypothesized that BK potentiates P2X currents of muscle dorsal root ganglion (DRG) neurons, and this effect is greater in HF due to upregulation of BK kinin B2 and P2X3 receptor...
2016: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/27755539/hypersensitivity-induced-by-activation-of-spinal-cord-par2-receptors-is-partially-mediated-by-trpv1-receptors
#13
Petra Mrozkova, Diana Spicarova, Jiri Palecek
Protease-activated receptors 2 (PAR2) and transient receptor potential vanilloid 1 (TRPV1) receptors in the peripheral nerve endings are implicated in the development of increased sensitivity to mechanical and thermal stimuli, especially during inflammatory states. Both PAR2 and TRPV1 receptors are co-expressed in nociceptive dorsal root ganglion (DRG) neurons on their peripheral endings and also on presynaptic endings in the spinal cord dorsal horn. However, the modulation of nociceptive synaptic transmission in the superficial dorsal horn after activation of PAR2 and their functional coupling with TRPV1 is not clear...
2016: PloS One
https://www.readbyqxmd.com/read/27739618/stimulating-trpv1-externalization-and-synthesis-in-dorsal-root-ganglion-neurons-contributes-to-pge2-potentiation-of-trpv1-activity-and-nociceptor-sensitization
#14
W Ma, B St-Jacques, U Rudakou, Y N Kim
BACKGROUND: Persistent peripheral sensitization contributes to chronic pain. Plasticity of nociceptive dorsal root ganglion (DRG) neurons (nociceptors) induced by pro-inflammatory mediators contributes to sensitization. Prostaglandin E2 (PGE2) enriched in injured tissues is known not only directly to sensitize DRG neurons, but also to potentiate sensitizing effects of other pain mediators such as capsaicin and its receptor transient receptor potential vanilloid-1 (TRPV1). It remains unknown whether PGE2 potentiates TRPV1 activity by stimulating its synthesis, cell surface and axonal trafficking in DRG neurons...
October 14, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27720807/mechanical-sensitivity-and-electrophysiological-properties-of-acutely-dissociated-dorsal-root-ganglion-neurons-of-rats
#15
Viacheslav Viatchenko-Karpinski, Jianguo G Gu
Primary afferent fibers use mechanically activated (MA) currents to transduce innocuous and noxious mechanical stimuli. However, it is largely unknown about the differences in MA currents between the afferents for sensing innocuous and noxious stimuli. In the present study, we used dorsal root ganglion (DRG) neurons acutely dissociated from rats and studied their MA currents and also their intrinsic membrane properties. Recorded from small-sized DRG neurons, we found that most of these neurons were mechanically sensitive (MS) showing MA currents...
October 5, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27707699/effect-of-transcutaneous-electrical-acupuncture-point-stimulation-at-different-frequencies-in-a-rat-model-of-neuropathic-pain
#16
Xiangdi Yu, Fangxiang Zhang, Bingning Chen
BACKGROUND: Acupuncture and related techniques are used worldwide to alleviate pain; however, their mechanisms of action are still not fully understood. In the present study, we investigated the effect of transcutaneous electrical acupuncture point stimulation (TEAS) at different frequencies in a chronic constriction injury (CCI) model of neuropathic pain in rats. METHODS: CCI was induced by ligating the common sciatic nerve, which produced neuropathic pain. 18 male Sprague-Dawley rats with CCI were randomly divided into three groups (n=6 each) that remained untreated (CCI group) or received TEAS at high frequency (CCI+TEAS-H group) or TEAS at low frequency (CCI+TEAS-L group)...
October 4, 2016: Acupuncture in Medicine: Journal of the British Medical Acupuncture Society
https://www.readbyqxmd.com/read/27687223/dorsal-root-ganglionic-field-stimulation-relieves-spontaneous-and-induced-neuropathic-pain-in-rats
#17
Bin Pan, Hongwei Yu, Gregory J Fischer, Jeffery M Kramer, Quinn H Hogan
: Dorsal root ganglion (DRG) electrical stimulation (ganglionic field stimulation [GFS]) is effective in relieving clinical pain, but its mechanism is unknown. We therefore developed a rat model for GFS to test analgesic effects in the context of neuropathic pain. GFS was applied with a bipolar electrode at L4, using parameters replicating clinical use (20 Hz, 150-μs pulse width, current at 80% of motor threshold). Neuropathic pain was generated by tibial nerve injury (TNI). Pain behavior was monitored by determining the threshold for withdrawal from punctate mechanical stimuli, by identifying hyperalgesic responses to noxious mechanical stimuli, and by hypersensitivity to cold...
September 26, 2016: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/27676680/intrathecal-bupivacaine-monotherapy-with-a-retrograde-catheter-for-the-management-of-complex-regional-pain-syndrome-of-the-lower-extremity
#18
W Porter McRoberts, Catalina Apostol, Abdul Haleem
UNLABELLED: Complex regional pain syndrome (CRPS) presents a therapeutic challenge due to its many presentations and multifaceted pathophysiology. There is no approved treatment algorithm and clinical interventions are often applied empirically. In cases of CRPS where symptoms are localized to an extremity, a targeted treatment is indicated. We describe the use of intrathecal bupivacaine monotherapy, delivered through a retrograde catheter, in the treatment of CRPS affecting the lower extremity...
September 2016: Pain Physician
https://www.readbyqxmd.com/read/27611826/percutaneous-cervical-nucleoplasty-vs-pulsed-radio-frequency-of-the-dorsal-root-ganglion-in-patients-with-contained-cervical-disk-herniation-a-prospective-randomized-controlled-trial
#19
Willy Halim, Walter van der Weegen, Toine Lim, Jorgen Antonin Wullems, Kris Christiaan Vissers
BACKGROUND: Cervical neck pain is often caused by cervical disk pathology and may cause severe symptoms and disability. Surgeons and patients are increasingly aware of postsurgery-related complications. This stimulated the clinical usage of minimally invasive treatments such as percutaneous nucleoplasty (PCN) and pulsed radio frequency (PRF). However, scientific evidence on both treatments is limited. OBJECTIVE: Our objective was to evaluate the efficacy of PCN compared to PRF in patients with contained cervical disk herniation...
September 9, 2016: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/27611779/camkii-mediated-creb-phosphorylation-is-involved-in-ca2-induced-bdnf-mrna-transcription-and-neurite-outgrowth-promoted-by-electrical-stimulation
#20
Xiaodong Yan, Juanfang Liu, Zhengxu Ye, Jinghui Huang, Fei He, Wei Xiao, Xueyu Hu, Zhuojing Luo
Electrical stimulation (ES)-triggered up-regulation of brain-derived neurotrophic factor (BDNF) and neurite outgrowth in cultured rat postnatal dorsal root ganglion neurons (DRGNs) is calcium (Ca2+)-dependent. The effects of increased Ca2+ on BDNF up-regulation and neurite outgrowth remain unclear. We showed here that ES increased phosphorylation of the cAMP-response element binding protein (CREB). Blockade of Ca2+ suppressed CREB phosphorylation and neurite outgrowth. Down-regulation of phosphorylated (p)-CREB reduced BDNF transcription and neurite outgrowth triggered by ES...
2016: PloS One
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