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dorsal root ganglion stimulation

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https://www.readbyqxmd.com/read/29045838/p75-is-required-for-the-establishment-of-postnatal-sensory-neuron-diversity-by-potentiating-ret-signaling
#1
Zhijiang Chen, Christopher R Donnelly, Bertha Dominguez, Yoshinobu Harada, Weichun Lin, Alan S Halim, Tasha G Bengoechea, Brian A Pierchala, Kuo-Fen Lee
Producing the neuronal diversity required to adequately discriminate all elements of somatosensation is a complex task during organogenesis. The mechanisms guiding this process during dorsal root ganglion (DRG) sensory neuron specification remain poorly understood. Here, we show that the p75 neurotrophin receptor interacts with Ret and its GFRα co-receptor upon stimulation with glial cell line-derived neurotrophic factor (GDNF). Furthermore, we demonstrate that p75 is required for GDNF-mediated Ret activation, survival, and cell surface localization of Ret in DRG neurons...
October 17, 2017: Cell Reports
https://www.readbyqxmd.com/read/29044528/endomorphins-potentiate-asic-currents-and-enhance-the-lactic-acid-mediated-increase-in-arterial-blood-pressure-effects-amplified-in-hindlimb-ischemia
#2
Mohamed Farrag, Julie K Drobish, Henry L Puhl, Joyce S Kim, Paul B Herold, Marc P Kaufman, Victor Ruiz-Velasco
Chronic muscle ischemia leads to accumulation of lactic acid and other inflammatory mediators with a subsequent drop in interstitial pH. Acid-sensing ion channels (ASICs), expressed in thin muscle afferents, sense the decrease in pH and evoke a pressor reflex known to increase mean arterial pressure. The naturally occurring endomorphins are also released by primary afferents under ischemic conditions. We examined whether high affinity mu opioid receptor (MOR) agonists, endomorphin-1 (E-1) and -2 (E-2), modulate ASIC currents and the lactic acid-mediated pressor reflex...
October 16, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29026048/spinal-cord-stimulation-for-chronic-non-cancer-pain-a-review-of-current-evidence-and-practice
#3
S Sc Wong, C W Chan, C W Cheung
Spinal cord stimulation provides analgesia through electrical stimulation of the dorsal column of the spinal cord via electrode leads placed into the epidural space. In traditional tonic stimulation, a painful sensation is replaced with paraesthesia. Spinal cord stimulation is effective in reducing neuropathic pain, enhancing function, and improving quality of life in different chronic pain conditions. Currently, there is most evidence to support its use for failed back surgery syndrome when multidisciplinary conventional management is unsuccessful...
October 2017: Hong Kong Medical Journal, Xianggang Yi Xue za Zhi
https://www.readbyqxmd.com/read/28982974/protein-kinase-a-induced-internalization-of-slack-channels-from-the-neuronal-membrane-occurs-by-adaptor-protein-2-clathrin-mediated-endocytosis
#4
Sushmitha Gururaj, Katherine M Evely, Kerri D Pryce, Jun Li, Jun Qu, Arin Bhattacharjee
The sodium-activated potassium (KNa) channel Kcnt1 (Slack) is abundantly expressed in nociceptor (pain sending) neurons of the dorsal root ganglion (DRG), where they transmit the large outward conductance IKNa and arbitrate membrane excitability. Slack channel expression at the DRG membrane is necessary for their characteristic firing accommodation during maintained stimulation, and reduced membrane channel density causes hyperexcitability. We have previously shown that in a pro-inflammatory state, a decrease in membrane channel expression leading to reduced Slack-mediated IKNa expression underlies DRG sensitization...
October 5, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28973941/granulocyte-colony-stimulating-factor-g-csf-signaling-in-spinal-microglia-drives-visceral-sensitization-following-colitis
#5
Lilian Basso, Tamia K Lapointe, Mircea Iftinca, Candace Marsters, Morley D Hollenberg, Deborah M Kurrasch, Christophe Altier
Pain is a main symptom of inflammatory diseases and often persists beyond clinical remission. Although we have a good understanding of the mechanisms of sensitization at the periphery during inflammation, little is known about the mediators that drive central sensitization. Recent reports have identified hematopoietic colony-stimulating factors as important regulators of tumor- and nerve injury-associated pain. Using a mouse model of colitis, we identify the proinflammatory cytokine granulocyte-colony-stimulating factor (G-CSF or Csf-3) as a key mediator of visceral sensitization...
October 2, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28973357/a-prospective-analysis-of-neuromonitoring-for-confirmation-of-lead-placement-in-dorsal-root-ganglion-stimulation
#6
Steven M Falowski, Andreas Dianna
BACKGROUND: Dorsal root ganglion stimulation is a neuromodulation therapy used for chronic neuropathic pain. Typically, patients are awakened intraoperatively to confirm adequate placement. OBJECTIVE: To determine whether neuromonitoring can confirm placement in an asleep patient. METHODS: This is a prospective analysis of 12 leads placed in 6 patients. Lead confirmation was confirmed by awake intraoperative testing, as well as asleep testing utilizing neuromonitoring...
August 2, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28960653/the-efficacy-and-safety-of-dorsal-root-ganglion-stimulation-as-a-treatment-for-neuropathic-pain-a-literature-review
#7
REVIEW
Conrad Harrison, Sarah Epton, Stana Bojanic, Alexander L Green, James J FitzGerald
OBJECTIVE: Dorsal root ganglion stimulation (DRGS) received its first regulatory approval (CE marking in Europe) in late 2011, and so its use is now almost six years old. Several thousand patients have already been treated, and a landmark trial in lower limb complex regional pain syndrome (CRPS) and causalgia has recently been published. METHODS: In this review we have summarized the literature to date on the use of DRGS in the treatment of neuropathic pain. RESULTS: The results so far are encouraging, with reports of successful use in treating a wide range of indications including postsurgical pain, CRPS, and phantom pain...
September 28, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28940994/drg-spinal-cord-stimulation-as-solution-for-patients-with-severe-pain-due-to-anterior-cutaneous-nerve-entrapment-syndrome-a-case-series
#8
Frédérique Mathilde Ulrike Mol, Rudi M H Roumen
OBJECTIVES: Anterior Cutaneous Nerve Entrapment Syndrome (ACNES) is a debilitating neuropathic pain condition. A small portion of patients do not respond to any currently available treatment modalities. These patients, often young women, might benefit from targeted spinal cord stimulation of the dorsal root ganglion (DRG). METHODS: This retrospective case series describes five ACNES patients who were referred from a Dutch dedicated tertiary referral center to collaborating sites with extensive experience in DRG stimulation to be implanted with a DRG Axium System (St...
September 21, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28938297/new-advancements-in-spinal-cord-stimulation-for-chronic-pain-management
#9
Jijun Xu, Aijun Liu, Jianguo Cheng
PURPOSE OF REVIEW: To update the recent development of spinal cord stimulation (SCS) technology in the management of chronic pain. RECENT FINDINGS: Efficacy of SCS therapy has been significantly improved by the recent development of high frequency (HF-10 kHz) stimulation, burst stimulation, and dorsal root ganglion (DRG) stimulation. A few latest SCS modalities are in clinical trial. New approaches to guide lead placement and advances in surgical lead are introduced...
September 21, 2017: Current Opinion in Anaesthesiology
https://www.readbyqxmd.com/read/28895256/relevant-anatomy-morphology-and-implantation-techniques-of-the-dorsal-root-ganglia-at-the-lumbar-levels
#10
Tim Vancamp, Robert M Levy, Isaac Peña, Antonio Pajuelo
OBJECTIVES: While dorsal root ganglion (DRG) stimulation has been available in Europe and Australia for the past five years and in the United States for the past year, there are no published details concerning the optimal procedures for DRG lead implantation. MATERIALS AND METHODS: We describe several techniques that can be applied to implant cylindrical leads over the DRG, highlighting some tips and tricks according to our experiences. Focus is mainly shifted toward implantations in the lumbar area...
October 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28891508/spike-propagation-in-axons-under-stretch-growth-conditions-in-cultured-neurons-from-dorsal-root-ganglion
#11
Xiao Li, Qi Xu, Jiping He
Computational software NEURON was used to simulate the stretch growth neurons in order to investigate the ability of dorsal root ganglion neurons to generate and propagate action potentials after a period of rapid axon stretch growth in vitro, and under what stimulating parameters can evoke action potentials. In the simulation, we found the stretch growth neuron had higher spike amplitude than from the static culture neuron in the soma and all axonal branch. In addition, the conduction velocity was also faster in the stretch growth axon...
2017: Journal of Integrative Neuroscience
https://www.readbyqxmd.com/read/28882562/candesartan-prevents-resiniferatoxin-induced-sensory-small-fiber-neuropathy-in-mice-by-promoting-angiotensin-ii-mediated-at2-receptor-stimulation
#12
Flavien Bessaguet, Aurore Danigo, Laurent Magy, Franck Sturtz, Alexis Desmoulière, Claire Demiot
Sensory defects associated with small-fiber neuropathy (SFN) can lead to profound disabilities. The relationship between the sensory nervous system and modulation of the renin-angiotensin system (RAS) has been described and focused on pain and neurodegeneration in several animal models. We have recently developed an experimental model of functional sensory neuropathy showing thermal hypoalgesia and neuropeptide depletion without nerve fiber degeneration. Here, we aimed to determine whether the modulation of angiotensin II (Ang II) activity could prevent sensory neuropathy induced by RTX...
September 5, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28877968/action-potential-broadening-in-capsaicin-sensitive-drg-neurons-from-frequency-dependent-reduction-of-kv3-current
#13
Pin W Liu, Nathaniel T Blair, Bruce P Bean
Action potential (AP) shape is a key determinant of cellular electrophysiological behavior. We found that in small-diameter, capsaicin-sensitive dorsal root ganglia neurons corresponding to nociceptors (from rats of either sex), stimulation at frequencies as low as 1 Hz produced progressive broadening of the APs. Stimulation at 10 Hz for 3 s resulted in an increase in AP width by an average of 76 ± 7% at 22°C and by 38 ± 3% at 35°C. AP clamp experiments showed that spike broadening results from frequency-dependent reduction of potassium current during spike repolarization...
October 4, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28872725/dorsal-root-ganglion-field-stimulation-prevents-inflammation-and-joint-damage-in-a-rat-model-of-rheumatoid-arthritis
#14
Bin Pan, Zhiyong Zhang, Dongman Chao, Quinn H Hogan
OBJECTIVES: Electrical stimulation of the dorsal root ganglion (DRG), referred to here as ganglionic field stimulation (GFS), is effective in reducing clinical pain, probably by interrupting transmission of afferent impulse trains on sensory neurons as they pass through the DRG. We therefore tested whether efferent impulse trains conveyed by sensory neurons, which contribute to neurogenic inflammation, may also be interrupted by GFS. MATERIALS AND METHODS: Collagen-induced arthritis, a model of clinical rheumatoid arthritis, was initiated in rats concurrently with the insertion of an electrode for GFS at the fourth lumbar DRG...
September 5, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28862789/creating-a-strain-relief-loop-during-s1-transforaminal-lead-placement-for-dorsal-root-ganglion-stimulation-for-foot-pain-a-technical-note
#15
Valery van Velsen, Noud van Helmond, Kenneth B Chapman
Chronic neuropathic pain is often refractory to conventional medical treatments and leads to significant disability and socio-economic burden. Dorsal root ganglion (DRG) stimulation has recently emerged as a treatment for persistent neuropathic pain, but creating a strain relief loop on the S1 level has thus far been a challenging technical component of DRG lead placement. We describe a refined technique for strain relief loop formation on the S1 level using a transforaminal approach that we employed in a 45-year old patient with intractable foot pain...
September 1, 2017: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/28827823/comparison-of-efficacy-of-continuous-epidural-block-and-pulsed-radiofrequency-to-the-dorsal-root-ganglion-for-management-of-pain-persisting-beyond-the-acute-phase-of-herpes-zoster
#16
COMPARATIVE STUDY
Eung Don Kim, Young In Lee, Hue Jung Park
BACKGROUND: There is little evidence regarding the effectiveness of intervention methods in the treatment of zoster-related pain (ZAP) after the acute phase of zoster. Generally, if ZAP remains after more than 180 days from its onset, the likelihood of pain reduction is very low; this condition is considered as a "well established" post-herpetic neuralgia (PHN). Although the clinical efficacy of intrathecal steroid injection and spinal cord stimulation (SCS) for ZAP management has been reported, these interventions are not widely used due to inherent disadvantages...
2017: PloS One
https://www.readbyqxmd.com/read/28816708/single-incision-approach-to-implantation-of-the-pulse-generator-and-leads-for-dorsal-root-ganglion-stimulation-a-case-report
#17
Valery van Velsen, Noud van Helmond, Mitchell E Levine, Kenneth B Chapman
Dorsal root ganglion (DRG) stimulation has recently emerged as a treatment for persistent neuropathic pain, but the permanent implantation of stimulator leads and the pulse generator can be difficult and is sometimes associated with complications. We used a single-incision approach to tunnel and implant the leads and pulse generator for DRG stimulation treatment in a patient suffering from intractable foot pain. At long-term follow-up, the patient experienced a decrease in pain intensity and improvement in function, without any complications...
August 14, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28789985/interleukin-8-levels-in-rat-models-of-nerve-damage-and-neuropathic-pain
#18
Junad Khan, Humza Hassun, Tali Zusman, Olga Korczeniewska, Eli Eliav
Interleukin-8 (IL-8) is a pro-inflammatory cytokine that has been shown to play a role in inflammatory and autoimmune disorders. The objective of the present study was to assess the levels of IL-8 in rat serum, dorsal root ganglion (DRG) and the sciatic nerve following four different forms of sciatic nerve injury. The models used to induce the injury included partial sciatic ligation (PSL), chronic constriction injury (CCI), perineural inflammation (neuritis) and complete sciatic transection (CST). Mechanical and thermal hyperalgesia were detected by measuring withdrawal responses from a mechanical stimulus and withdrawal latency from thermal stimulation...
August 5, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28769585/%C3%AE-lipoic-acid-suppresses-neuronal-excitability-and-attenuates-colonic-hypersensitivity-to-colorectal-distention-in-diabetic-rats
#19
Yan Sun, Pan-Pan Yang, Zhen-Yuan Song, Yu Feng, Duan-Min Hu, Ji Hu, Guang-Yin Xu, Hong-Hong Zhang
AIM: Patients with long-standing diabetes often demonstrate intestinal dysfunction, characterized as constipation or colonic hypersensitivity. Our previous studies have demonstrated the roles of voltage-gated sodium channels NaV1.7 and NaV1.8 in dorsal root ganglion (DRG) in colonic hypersensitivity of rats with diabetes. This study was designed to determine roles of antioxidant α-lipoic acid (ALA) on sodium channel activities and colonic hypersensitivity of rats with diabetes. METHODS: Streptozotocin was used to induce diabetes in adult female rats...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28767512/dissecting-the-role-of-the-crmp2-neurofibromin-complex-on-pain-behaviors
#20
Aubin Moutal, Yue Wang, Xiaofang Yang, Yingshi Ji, Shizhen Luo, Angie Dorame, Shreya S Bellampalli, Lindsey A Chew, Song Cai, Erik T Dustrude, James E Keener, Michael T Marty, Todd W Vanderah, Rajesh Khanna
Neurofibromatosis type 1 (NF1), a genetic disorder linked to inactivating mutations or a homozygous deletion of the Nf1 gene, is characterized by tumorigenesis, cognitive dysfunction, seizures, migraine, and pain. Omic studies on human NF1 tissues identified an increase in the expression of collapsin response mediator protein 2 (CRMP2), a cytosolic protein reported to regulate the trafficking and activity of presynaptic N-type voltage-gated calcium (Cav2.2) channels. Because neurofibromin, the protein product of the Nf1 gene, binds to and inhibits CRMP2, the neurofibromin-CRMP2 signaling cascade will likely affect Ca channel activity and regulate nociceptive neurotransmission and in vivo responses to noxious stimulation...
November 2017: Pain
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