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Allodynia

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https://www.readbyqxmd.com/read/28548225/single-and-combined-effects-of-delta-9-tetrahydrocannabinol-and-cannabidiol-in-a-mouse-model-of-chemotherapy-induced-neuropathic-pain
#1
Kirsten M King, Alyssa M Myers, Ariele J Soroka-Monzo, Ronald F Tuma, Ronald J Tallarida, Ellen A Walker, Sara Jane Ward
BACKGROUND AND PURPOSE: It has been suggested that the non-psychoactive phytocannabinoid cannabidiol (CBD) can impact the pharmacological effects of delta-9-tetrahydrocannabinol (THC). We tested the hypothesis that CBD and THC would significantly mitigate mechanical sensitivity in a mouse model of paclitaxel-induced neuropathic pain, and that CBD+THC combinations would produce synergistic effects. We also tested the hypothesis that CBD would attenuate oxaliplatin- and vincristine- induced mechanical sensitivity...
May 26, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28536509/chronic-social-stress-time-dependently-affects-neuropathic-pain-related-cold-allodynia-and-leads-to-altered-expression-of-spinal-biochemical-mediators
#2
Glenn-Marie Le Coz, Julien Genty, Fernand Anton, Ulrike Hanesch
Clinical data have shown that chronic exposure to stress may be accompanied by an enhancement of inflammation-related pain sensitivity. In this context, little is however known on the impact of stress on neuropathic pain. In the present study we addressed this issue by combining the chronic constriction injury (CCI) model with an ongoing social stress (OSS) paradigm. Cold plate and von Frey tests were performed in 48 rats divided into four groups: OSS exposed to OSS, CCI subjected to chronic nerve constriction, OSS+CCI with a combination of neuropathy and stress and CON, a control group lacking any manipulation...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28535568/tianeptine-reduces-mechanical-allodynia-in-spinal-nerve-ligated-and-chemotherapy-induced-neuropathic-mice
#3
Seong Min Han, Young Hoon Kim, Hyeon Uk Jo, Jung Ah Kwak, Hue Jung Park
BACKGROUND: Spinal nerve-ligated neuropathy and chemotherapy-induced neuropathy produce a persistent tactile allodynia in mice. Tianeptine is an antidepressant that exhibits structural similarities to tricyclic antidepressants but has distinct neurochemical properties. OBJECTIVE: Here we examined the effects of intraperitoneal (i.p.) tianeptine on allodynia in spinal nerve-ligated and chemotherapy-induced neuropathic mice. STUDY DESIGN: A randomized, experimental trial...
May 2017: Pain Physician
https://www.readbyqxmd.com/read/28535565/ephrinb-ephb-signaling-induces-hyperalgesia-through-erk5-creb-pathway-in-rats
#4
Li-Na Yu, Li-Hong Sun, Min Wang, Lie-Ju Wang, Ying Wu, Jing Yu, Wen-Na Wang, Feng-Jiang Zhang, Xue Li, Min Yan
BACKGROUND: There are numerous studies implicating that EphB receptors and ephrinB ligands play important roles in modulating the transduction of spinal nociceptive information. EphrinB-EphB signaling may contribute to hyperalgesia via various kinds of downstream molecules, the mechanisms of which have not been completely understood. OBJECTIVE: The aim of the present study was to identify whether ephrinB-EphB signaling could contribute to hyperalgesia through ERK5/CREB pathway...
May 2017: Pain Physician
https://www.readbyqxmd.com/read/28535564/the-different-dynamic-changes-of-nerve-growth-factor-in-the-dorsal-horn-and-dorsal-root-ganglion-leads-to-hyperalgesia-and-allodynia-in-diabetic-neuropathic-pain
#5
Zhifeng Gao, Yi Feng, Hui Ju
BACKGROUND: Diabetic peripheral neuropathy (DPN) is the most common complication of diabetes and more than half of the patients with DPN have self-reported symptoms referring to painful diabetic neuropathy (PDN). Nerve growth factor (NGF) is a key factor for the nervous system, but the role of it in the neuropathic pain of diabetic patients is unclear. OBJECTIVE: This study aimed to investigate the relationship between the dynamic expression of NGF in dorsal horn and dorsal root ganglion (DRG) of diabetic rats and hyperalgesia and allodynia in diabetic neuropathic pain...
May 2017: Pain Physician
https://www.readbyqxmd.com/read/28535116/is-mannitol-the-treatment-of-choice-for-patients-with-ciguatera-fish-poisoning
#6
Michael E Mullins, Robert S Hoffman
CONTEXT: Ciguatera fish poisoning arises primarily from consumption of carnivorous reef fish caught in tropical and sub-tropical waters. Ciguatoxins, a class of tasteless, heat-stable, polycyclic toxins produced by dinoflagellates, accumulate through the food chain and concentrate in various carnivorous fish, such as groupers, barracudas, wrasses, amberjack, kingfishes, and eels. Characteristics of ciguatera fish poisoning include early nausea, vomiting, and diarrhea in the first one to two days post ingestion, followed by the appearance of sensory disturbances...
May 23, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28533287/trv0109101-a-g-protein-biased-agonist-of-the-%C3%A2%C2%B5-opioid-receptor-does-not-promote-opioid-induced-mechanical-allodynia-following-chronic-administration
#7
Michael Koblish, Richard Carr, Edward R Siuda, David H Rominger, William Gowen-MacDonald, Conrad L Cowan, Aimee L Crombie, Jonathan D Violin, Michael W Lark
Prescription opioids are a mainstay in the treatment of acute moderate to severe pain. However, chronic use leads to a host of adverse consequences including tolerance and opioid-induced hyperalgesia (OIH), leading to more complex treatment regimens and diminished patient compliance. Patients experiencing OIH paradoxically experience exaggerated nociceptive responses instead of pain reduction after chronic opioid usage. The development of OIH and tolerance tend to occur simultaneously and, thus, present a challenge when studying the molecular mechanisms driving each phenomenon...
May 22, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28532680/decreased-spinal-endomorphin-2-contributes-to-mechanical-allodynia-in-streptozotocin-induced-diabetic-rats
#8
Le Niu, Guang-Hai Dai, Gao-Le He, Ming Yang, Hui-Min Hu, Zhong-Kai Liu, Nian-Song Qian, Yong-Liang Chen
Diabetic neuropathic pain (DNP) plays a major role in decreased life quality of diabetes patients, however, the neural mechanisms underlying DNP remain unclear. Endomorphins are the endogenous ligands for mu-opioid receptor. There is increasing evidence implicating the involvement of spinal endomorphin-2 (EM2) in neuropathic pain. In this study, using a streptozotocin induced diabetic rat model that displayed obvious mechanical allodynia, it was found that the expression of spinal EM2 was significantly decreased in DNP rats...
May 19, 2017: Neurochemistry International
https://www.readbyqxmd.com/read/28530662/pd-l1-inhibits-acute-and-chronic-pain-by-suppressing-nociceptive-neuron-activity-via-pd-1
#9
Gang Chen, Yong Ho Kim, Hui Li, Hao Luo, Da-Lu Liu, Zhi-Jun Zhang, Mark Lay, Wonseok Chang, Yu-Qiu Zhang, Ru-Rong Ji
Programmed cell death ligand-1 (PD-L1) is typically produced by cancer cells and suppresses immunity through the receptor PD-1 expressed on T cells. However, the role of PD-L1 and PD-1 in regulating pain and neuronal function is unclear. Here we report that both melanoma and normal neural tissues including dorsal root ganglion (DRG) produce PD-L1 that can potently inhibit acute and chronic pain. Intraplantar injection of PD-L1 evoked analgesia in naive mice via PD-1, whereas PD-L1 neutralization or PD-1 blockade induced mechanical allodynia...
May 22, 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28528294/isoliquiritigenin-reduces-oxidative-damage-and-alleviates-mitochondrial-impairment-by-sirt1-activation-in-experimental-diabetic-neuropathy
#10
Veera Ganesh Yerra, Anil Kumar Kalvala, Ashutosh Kumar
Sirtuin (SIRT1) inactivation underlies the pathogenesis of insulin resistance and hyperglycaemia-associated vascular complications, but its role in diabetic neuropathy (DN) has not been yet explored. We have evaluated hyperglycaemia-induced alteration of SIRT1 signalling and the effect of isoliquiritigenin (ILQ) on SIRT1-directed AMP kinase (AMPK) and peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) signalling in peripheral nerves of streptozotocin (STZ) (55 mg/kg, ip)-induced diabetic rats and in high glucose (30 mM)-exposed neuro2a (N2A) cells...
May 11, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28526335/the-spider-toxin-ph%C3%AE-1%C3%AE-recombinant-possesses-strong-analgesic-activity
#11
Flavia Karine Rigo, Gabriela Trevisan, Samira Dal-Toé De Prá, Marta Nascimento Cordeiro, Marcia Helena Borges, Juliana Figueiredo Silva, Flavia Viana Santa Cecilia, Alessandra Hubner de Souza, Gabriela de Oliveira Adamante, Alessandra Marcon Milioli, Célio José de Castro Junior, Juliano Ferreira, Marcus Vinicius Gomez
The native Phα1β - a Voltage-Gated Calcium Channel (VGCC) blocker - and its Recombinant Version - were both tested in rodent pain models with an intraplantar injections of capsaicin or formalin, a chronic constriction injury, and melanoma cancer related pain. The formalin nociceptive behaviour in the neurogenic phase was not affected by the toxin pre-treatments, while in the inflammatory phase, Phα1β and the Recombinant form caused a significant reduction. The nociception that was triggered by capsaicin, an agonist of the TRPV1 vanilloid receptor, was totally blocked by 100 pmol/site, i...
May 17, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28525360/role-of-sigma-1-receptor-in-high-fat-diet-induced-peripheral-neuropathy
#12
Tieying Song, Jianhui Zhao, Xiaojing Ma, Zaiwang Zhang, Bo Jiang, Yunliang Yang
The neurobiological mechanisms of obesity-induced peripheral neuropathy are poorly understood. We evaluated the role of Sigma-1 receptor (Sig-1R) and NMDA receptor (NMDARs) in the spinal cord in peripheral neuropathy using an animal model of high fat diet-induced diabetes. We examined the expression of Sig-1R and NMDAR subunits GluN2A and GluN2B along with postsynaptic density protein 95 (PSD-95) in the spinal cord after 24- week HFD treatment in both wild-type and Sig-1R-/- mice. Finally, we examined the effects of repeated intrathecal administrations of selective Sig-1R antagonists BD1047 in HFD-fed wild-type mice on peripheral neuropathy...
May 19, 2017: Biological Chemistry
https://www.readbyqxmd.com/read/28522185/orofacial-complex-regional-pain-syndrome-pathophysiologic-mechanisms-and-functional-mri
#13
Yeon-Hee Lee, Kyung Mi Lee, Hyug-Gi Kim, Soo-Kyung Kang, Q-Schick Auh, Jyung-Pyo Hong, Yang-Hyun Chun
Complex regional pain syndrome (CRPS) is one of the most challenging chronic pain conditions and is characterized by burning pain, allodynia, hyperalgesia, autonomic changes, trophic changes, edema, and functional loss involving mainly the extremities. Until recently, very few reports have been published concerning CRPS involving the orofacial area. We report on a 50-year-old female patient who presented with unbearable pain in all of her teeth and hypersensitivity of the facial skin. She also reported intractable pain in both extremities accompanied by temperature changes and orofacial pain that increased when the other pains were aggravated...
March 14, 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28516219/decreased-sensory-nerve-excitation-and-bone-pain-associated-with-mouse-lewis-lung-cancer-in-trpv1-deficient-mice
#14
Hiroki Wakabayashi, Satoshi Wakisaka, Toru Hiraga, Kenji Hata, Riko Nishimura, Makoto Tominaga, Toshiyuki Yoneda
Bone pain is one of the most common and life-limiting complications of cancer metastasis to bone. Although the mechanism of bone pain still remains poorly understood, bone pain is evoked as a consequence of sensitization and excitation of sensory nerves (SNs) innervating bone by noxious stimuli produced in the microenvironment of bone metastases. We showed that bone is innervated by calcitonin gene-related protein (CGRP)(+) SNs extending from dorsal root ganglia (DRG), the cell body of SNs, in mice. Mice intratibially injected with Lewis lung cancer (LLC) cells showed progressive bone pain evaluated by mechanical allodynia and flinching with increased CGRP(+) SNs in bone and augmented SN excitation in DRG as indicated by elevated numbers of pERK- and pCREB-immunoreactive neurons...
May 17, 2017: Journal of Bone and Mineral Metabolism
https://www.readbyqxmd.com/read/28514232/ppar%C3%AE-agonists-attenuate-trigeminal-neuropathic-pain
#15
Danielle N Lyons, Liping Zhang, Robert J Danaher, Craig S Miller, Karin N Westlund
The aim of this study is to investigate the role of peroxisome proliferator-activated receptor-gamma isoform (PPARγ), in trigeminal neuropathic pain utilizing a novel mouse trigeminal inflammatory compression (TIC) injury model. The study determined that the PPARγ nuclear receptor plays a significant role in trigeminal nociception transmission, evidenced by: (1) Intense PPARγ immunoreactivity is expressed 3 weeks after TIC nerve injury in the spinal trigeminal caudalis, the termination site of trigeminal nociceptive nerve fibers...
May 16, 2017: Clinical Journal of Pain
https://www.readbyqxmd.com/read/28513074/%C3%AE-myrtoxin-mp1a-is-a-helical-heterodimer-from-the-venom-of-the-jack-jumper-ant-with-antimicrobial-membrane-disrupting-and-nociceptive-activities
#16
Zoltan Dekan, Stephen J Heady, Martin Scanlon, Brian A Baldo, Tzong-Hsien Lee, Marie-Isabel Aguilar, Jennifer R Deuis, Irina Vetter, Alysha G Elliott, Maite Amado, Matthew A Cooper, Dianne Alewood, Paul Francis Alewood
Δ-Myrtoxin-Mp1a (Mp1a), a 49-residue heterodimeric peptide from the venom of Myrmecia pilosula is comprised of a 26-mer A chain and a 23-mer B chain connected by two disulfide bonds in an antiparallel arrangement. Combination of the individual synthetic chains via aerial oxidation remarkably resulted in the self-assembly of Mp1a as a homogenous product without the need for directed disulfide bond formation. NMR analysis revealed a well-defined, unique structure containing a pair of antiparallel α-helices...
May 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28507605/diclofenac-potassium-for-oral-solution-cambia-%C3%A2-in-the-acute-management-of-a-migraine-attack-clinical-evidence-and-practical-experience
#17
REVIEW
Shivang Joshi, Alan M Rapoport
Migraine headache affects about 12% of Western populations and is the third most common disease worldwide (sixth in terms of disability). In 1993, triptans were introduced in the United States as a new treatment for managing migraine attacks, but their use is limited by lack of response and safety concerns in some patients. Treatment options for patients with migraine who fail or cannot tolerate triptans include switching to another medication or adding an adjunctive medication. Desirable characteristics reported by patients for acute treatment of migraine attacks include complete pain relief, fast onset of action, and no pain recurrence...
April 2017: Therapeutic Advances in Neurological Disorders
https://www.readbyqxmd.com/read/28507468/paradoxical-effect-of-minocycline-on-established-neuropathic-pain-in-rat
#18
Malek Zarei, Masoumeh Sabetkasaei, Taraneh Moini-Zanjani
Neuropathic pain occurs after peripheral nerve damage, inflammation or infection. In this situation, microglial cells become activated and play a key role in producing pain. Minocycline (microglia inhibitor), was reported to reduce pain when used preventively. However, it seems that, when used after nerve injury, results in its pain reducing effects are different. In this regard, to assess the pain reducing differences of minocycline, neuropathic pain was induced by the ligation of the sciatic nerve in the rat which is recognized as chronic constriction injury (CCI) and minocycline was administered before and after sciatic nerve injury...
2017: EXCLI journal
https://www.readbyqxmd.com/read/28506898/chromane-isolated-from-leaves-of-dillenia-indica-improves-the-neuronal-dysfunction-in-stz-induced-diabetic-neuropathy
#19
Navpreet Kaur, Lalit Kishore, Randhir Singh
ETHNOPHARMACOLOGICAL RELEVANCE: According to the Indian traditional medicine, Dillenia indica L. has shown therapeutic efficacy in various diseases. Fruits and leaves of the plant possess anti-oxidant and anti-inflammatory properties. Reactive oxygen species, formation of advanced glycation end products (AGEs) and apoptosis are implicated in the pathogenesis of diabetic neuropathy. AIM OF THE STUDY: The aim of the present study was to explore the effect of D. indica and its isolate, chromane (CR), on thermal and mechanical hyperalgesia, allodynia, MNCV and oxidative-nitrosative stress in streptozotocin-induced experimental diabetes...
May 13, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28497343/bdnf-contributes-to-spinal-long-term-potentiation-and-mechanical-hypersensitivity-via-fyn-mediated-phosphorylation-of-nmda-receptor-glun2b-subunit-at-tyrosine-1472-in-rats-following-spinal-nerve-ligation
#20
Song Li, Jie Cai, Zhi-Bo Feng, Zi-Run Jin, Bo-Heng Liu, Hong-Yan Zhao, Hong-Bo Jing, Tian-Jiao Wei, Guan-Nan Yang, Ling-Yu Liu, Yan-Jun Cui, Guo-Gang Xing
Previously we have demonstrated that brain-derived neurotrophic factor (BDNF) contributes to spinal long-term potentiation (LTP) and pain hypersensitivity through activation of GluN2B-containing N-methyl-D-aspartate (GluN2B-NMDA) receptors in rats following spinal nerve ligation (SNL). However, the molecular mechanisms by which BDNF impacts upon GluN2B-NMDA receptors and spinal LTP still remain unclear. In this study, we first documented that Fyn kinase-mediated phosphorylation of GluN2B subunit at tyrosine 1472 (pGluN2B(Y1472)) was involved in BDNF-induced spinal LTP and pain hypersensitivity in intact rats...
May 11, 2017: Neurochemical Research
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