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Hyperalgesia

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https://www.readbyqxmd.com/read/29334500/overexpression-of-%C3%A2%C2%B5-opioid-receptors-in-peripheral-afferents-but-not-in-combination-with-enkephalin-decreases-neuropathic-pain-behavior-and-enhances-opioid-analgesia-in-mouse
#1
Amanda H Klein, Husam K Mohammad, Rabiah Ali, Brad Peper, Steven P Wilson, Srinivasa N Raja, Matthias Ringkamp, Sarah Sweitzer
BACKGROUND: The current study used recombinant herpes simplex virus type I to increase expression of µ-opiate receptors and the opioid ligand preproenkephalin in peripheral nerve fibers in a mouse model of neuropathic pain. It was predicted that viral vector delivery of a combination of genes encoding the µ-opioid receptor and preproenkephalin would attenuate neuropathic pain and enhance opioid analgesia. The behavioral effects would be paralleled by changes in response properties of primary afferent neurons...
January 15, 2018: Anesthesiology
https://www.readbyqxmd.com/read/29333099/pulsed-radiofrequency-applied-to-the-sciatic-nerve-improves-neuropathic-pain-by-down-regulating-the-expression-of-calcitonin-gene-related-peptide-in-the-dorsal-root-ganglion
#2
Hao Ren, Hailong Jin, Zipu Jia, Nan Ji, Fang Luo
Background: Clinical studies have shown that applying pulsed radiofrequency (PRF) to the neural stem could relieve neuropathic pain (NP), albeit through an unclear analgesic mechanism. And animal experiments have indicated that calcitonin gene-related peptide (CGRP) expressed in the dorsal root ganglion (DRG) is involved in generating and maintaining NP. In this case, it is uncertain whether PRF plays an analgesic role by affecting CGRP expression in DRG. Methods: Rats were randomly divided into four groups: Groups A, B, C, and D...
2018: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/29332858/the-effect-of-thiamine-and-its-metabolites-on-peripheral-neuropathic-pain-induced-by-cisplatin-in-rats
#3
Didem Onk, Renad Mammadov, Bahadir Suleyman, Ferda Keskin Cimen, Murat Cankaya, Vahdet Gul, Durdu Altuner, Onur Senol, Yucel Kadioglu, Ismail Malkoc, Halis Suleyman
Thiamine pyrophosphate (TPP) is the active metabolite of thiamine. This study aimed to investigate the effects of thiamine and TPP on cisplatin-induced peripheral neuropathic pain (PNP). Male albino Wistar type Rattus norvegicus were divided into six groups (n=6) that received 2 mg/kg cisplatin (CIS), 25 mg/kg thiamine (TM), 2 mg/kg cisplatin+25 mg/kg thiamine (CTM), 25 mg/kg TPP (TPP), 2 mg/kg cisplatin+25 mg/kg TPP (CTPP), or distilled water (healthy group; HG) for 8 days intraperitoneally. Analgesic effect was measured with a Basile Algesimeter...
January 12, 2018: Experimental Animals
https://www.readbyqxmd.com/read/29327392/differences-in-white-matter-structure-and-cortical-thickness-between-patients-with-traumatic-and-idiopathic-chronic-neck-pain-associations-with-cognition-and-pain-modulation
#4
I Coppieters, R De Pauw, K Caeyenberghs, D Lenoir, K DeBlaere, E Genbrugge, M Meeus, B Cagnie
Brain alterations are hypothesized to be present in patients with chronic whiplash-associated disorders (CWAD). The aim of this case-control study was to examine alterations in cortical thickness and white matter (WM) structure, and the presence of brain microhemorrhages in a patient group encountering chronic neck pain of traumatic origin (i.e., CWAD) when compared with a patient group characterized by nontraumatic chronic neck pain [i.e., chronic idiopathic neck pain (CINP)], and healthy controls. Furthermore, we aimed to investigate associations between brain structure on one hand and cognitive performance and central sensitization (CS) on the other hand...
January 11, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29324503/%C3%AE-asarone-alleviated-chronic-constriction-injury-induced-neuropathic-pain-through-inhibition-of-spinal-endoplasmic-reticulum-stress-in-an-liver-x-receptor-dependent-manner
#5
Yulong Gui, Aiyuan Li, Jie Zhang, Guan Li, Xia Ruan, Qulian Guo, Wangyuan Zou
BACKGROUND: Neuropathic pain is an intractable and complex disease. Recent studies have shown a close relationship between endoplasmic reticulum (ER) stress and neuropathic pain. Here, we investigated the effect of α-asarone, an ER stress inhibitor, on chronic constriction injury (CCI)-induced neuropathic pain. METHODS: Two parts were included in this study. In part 1, rats were assigned to 7 groups: the sham group, the sham + α-asarone 20 mg/kg group, the CCI group, the CCI + vehicle group, the CCI + α-asarone 5 mg/kg group, the CCI + α-asarone 10 mg/kg group, and the CCI + α-asarone 20 mg/kg group...
January 9, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29323698/xist-accelerates-neuropathic-pain-progression-through-regulation-of-mir-150-and-zeb1-in-cci-rat-models
#6
Xue-Tao Yan, Jing-Min Lu, Yu Wang, Xiao-Li Cheng, Xiang-Hu He, Wen-Zhong Zheng, Hu Chen, Yan-Lin Wang
LncRNAs are reported to participate in neuropathic pain development. LncRNA X-inactive specific transcript (XIST) is involved in the progression of various cancers. However, the role of XIST in neuropathic pain remains unclear. In our present study, we established a chronic constriction injury (CCI) rat model and XIST was found to be greatly upregulated both in the spinal cord tissues and in the isolated microglias of CCI rats. Inhibition of XIST inhibited neuropathic pain behaviors including mechanical and thermal hyperalgesia...
January 11, 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29322226/nebivolol-a-%C3%AE-blocker-abrogates-streptozotocin-induced-behavioral-biochemical-and-neurophysiological-deficit-by-attenuating-oxidative-nitrosative-stress-a-possible-target-for-the-prevention-of-diabetic-neuropathy
#7
Naini Bhadri, Rema Razdan, Sumanta Kumar Goswami
Metabolic abnormalities including hyperglycemia, hyperlipidemia, and oxidative-nitrosative stress are involved in the progression of diabetic neuropathy. In the present study, we targeted oxidative-nitrosative stress using nebivolol, a β1-receptor antagonist with vasodilator and antioxidant property, to evaluate its neuroprotective effect in streptozotocin-induced diabetic neuropathy in rats. Diabetic neuropathy develops within 4-6 weeks after administration of streptozotocin (55 mg/kg, i.p.). Therefore, after confirmation of diabetes, subtherapeutic doses of nebivolol (1 and 2 mg/kg, p...
January 11, 2018: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/29321494/transplantation-of-olfactory-ensheathing-cells-on-functional-recovery-and-neuropathic-pain-after-spinal-cord-injury-systematic-review-and-meta-analysis
#8
Babak Nakhjavan-Shahraki, Mahmoud Yousefifard, Vafa Rahimi-Movaghar, Masoud Baikpour, Farinaz Nasirinezhad, Saeed Safari, Mehdi Yaseri, Ali Moghadas Jafari, Parisa Ghelichkhani, Abbas Tafakhori, Mostafa Hosseini
There are considerable disagreements on the application of olfactory ensheathing cells (OEC) for spinal cord injury (SCI) rehabilitation. The present meta-analysis was designed to investigate the efficacy of OEC transplantation on motor function recovery and neuropathic pain alleviation in SCI animal models. Accordingly, all related studies were identified and included. Two independent researchers assessed the quality of the articles and summarized them by calculating standardized mean differences (SMD). OEC transplantation was shown to significantly improve functional recovery (SMD = 1...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321392/-the-role-of-brain-n-3-fatty-acids-gpr40-ffar1-signaling-in-pain
#9
Kazuo Nakamoto, Shogo Tokuyama
G-protein-coupled receptor 40 (GPR40)/free fatty acid receptor (FFAR) 1 is activated by long-chain fatty acids such as docosahexaenoic acid (DHA). Its receptor is expressed predominantly in the central nervous system (CNS) and in β-cells in the pancreatic Islets. We have already demonstrated that the intracerebroventricular administration of DHA or GW9508, a GPR40/FFAR1 agonist, suppresses formalin-induced pain behavior. It also attenuates complete Freund's adjuvant-induced mechanical allodynia and thermal hyperalgesia, suggesting that these effects occur by increasing β-endorphin release from propiomelanocortin neurons...
2018: Nihon Yakurigaku Zasshi. Folia Pharmacologica Japonica
https://www.readbyqxmd.com/read/29319609/joint-nociceptor-nerve-activity-and-pain-in-an-animal-model-of-acute-gout-and-its-modulation-by-intra-articular-hyaluronan
#10
Aida Marcotti, Ana Miralles, Eduardo Dominguez, Eliseo Pascual, Ana Gomis, Carlos Belmonte, Elvira de la Peña
The mechanisms whereby monosodium urate (MSU) crystals deposition in gout activate nociceptors to induce joint pain are incompletely understood. We tried to reproduce the signs of painful gouty arthritis, injecting into the knee joint of rats suspensions containing amorphous or triclinic, needle MSU crystals. The magnitude of MSU-induced inflammation and pain behavior signs was correlated with the changes in firing frequency of spontaneous and movement-evoked nerve impulse activity recorded in single knee joint nociceptor saphenous nerve fibers...
January 9, 2018: Pain
https://www.readbyqxmd.com/read/29318678/nociceptive-memristor
#11
Yumin Kim, Young Jae Kwon, Dae Eun Kwon, Kyung Jean Yoon, Jung Ho Yoon, Sijung Yoo, Hae Jin Kim, Tae Hyung Park, Jin-Woo Han, Kyung Min Kim, Cheol Seong Hwang
The biomimetic characteristics of the memristor as an electronic synapse and neuron have inspired the advent of new information technology in the neuromorphic computing. The application of the memristors can be extended to the artificial nerves on condition of the presence of electronic receptors which can transfer the external stimuli to the internal nerve system. In this work, nociceptor behaviors are demonstrated from the Pt/HfO2 /TiN memristor for the electronic receptors. The device shows four specific nociceptive behaviors; threshold, relaxation, allodynia, and hyperalgesia, according to the strength, duration, and repetition rate of the external stimuli...
January 10, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29317848/traumatic-osteoarthritis-induced-persistent-mechanical-hyperalgesia-in-a-rat-model-of-anterior-cruciate-ligament-transection-plus-a-medial-meniscectomy
#12
Hsiao-Chien Tsai, Ta-Liang Chen, Yu-Pin Chen, Ruei-Ming Chen
Background: Osteoarthritis (OA) is a degenerative joint disease characterized by progressive cartilage degeneration, subchondral bone changes, osteophyte formation, and synovitis. A major symptom is pain that is triggered by peripheral and central changes within the pain pathways. Some surgery-induced joint instability rat models of OA were described to mimic traumatic OA. Several behavioral tests were developed to access OA-induced pain. However, follow-up in most studies usually only occurred for about 4 weeks...
2018: Journal of Pain Research
https://www.readbyqxmd.com/read/29315430/swimming-training-attenuates-allodynia-and-hyperalgesia-induced-by-peripheral-nerve-injury-in-an-adult-male-rat-neuropathic-model-effects-on-irisin-and-gad65
#13
Babak Farzad, Hamid Rajabi, Reza Gharakhanlou, David J Allison, Parisa Hayat, Seyed Behnamedin Jameie
Objectives: The analgesic mechanism of long-lasting exercise on neuropathic pain is not well understood. This study explored the effects of swimming training on neuropathic pain and the expression of irisin, GAD65, and P2X3 after chronic constriction injury (CCI) of the sciatic nerve. Methods: Thirty-five male rats were randomly assigned to one of the following five groups: 1) no CCI or swimming (control); 2) swimming without CCI (SW); 3) swimming with CCI (CCISW); 4) CCI without swimming (CCI); and 5) sham CCI surgery (sham CCI)...
January 5, 2018: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/29314498/design-of-aminobenzothiazole-inhibitors-of-rho-kinases-1-and-2-utilizing-pka-as-a-structure-surrogate
#14
Russell Judge, Victoria Scott, Gricelda Simler, Steve Pratt, Marian Namovic, Brent Putman, Ana Aguirre, Vincent Stoll, Mulugeta Mamo, Steve Swann, Adrian D Hobson
We describe the design, synthesis and SAR of a series of 2-aminobenzothiazole inhibitors of Rho Kinase (ROCK) 1 and 2 which were optimized to low nanomolar potencies using structure-based design. Protein Kinase A was used as a surrogate protein structure to guide compound design. A subset of these molecules also showed robust activity in a myosin phosphatase cell based assay and in a mechanical hyperalgesia in vivo pain model.
January 4, 2018: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29310667/wwl70-protects-against-chronic-constriction-injury-induced-neuropathic-pain-in-mice-by-cannabinoid-receptor-independent-mechanisms
#15
Jie Wen, Melissa Jones, Mikiei Tanaka, Prabhuanand Selvaraj, Aviva J Symes, Brian Cox, Yumin Zhang
BACKGROUND: Targeting the endocannabinoid system has emerged as an effective strategy for the treatment of inflammatory and neurological diseases. Unlike the inhibition of the principal 2-arachidonyl glycerol (2-AG) hydrolytic enzyme monoacylglycerol lipase (MAGL), which leads to 2-AG overload and cannabinoid receptor desensitization, selective inhibition of the minor 2-AG hydrolytic enzyme alpha, beta-hydrolase domain 6 (ABHD6) can provide therapeutic benefits without producing cannabimimetic side effects...
January 8, 2018: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/29310498/-express-inhibition-of-toll-like-receptor-4-alleviates-hyperalgesia-induced-by-acute-dural-inflammation-in-experimental-migraine
#16
Min Su, Ye Ran, Zizi He, Mingjie Zhang, Guanqun Hu, Wenjing Tang, Dengfa Zhao, Shengyuan Yu
No abstract text is available yet for this article.
January 1, 2018: Molecular Pain
https://www.readbyqxmd.com/read/29306407/intracerebroventricular-injections-of-endotoxin-et-reduces-hippocampal-neurogenesis
#17
Farah Chamaa, Lynn Bitar, Batoul Darwish, Nayef E Saade, Wassim Abou-Kheir
Physio-pathological conditions such as neuroinflammation can modulate neurogenesis in the hippocampus. The aim of this study is to follow the time course of inflammation-induced effects on the neurogenic niche and the counter-effects of an anti-inflammatory drug. Rats received intracerebroventricular injections of lipopolysaccharide/endotoxin (ET) and intraperitoneal injections of 5'-bromo-2'-deoxyuridine, then perfused at different time intervals. At day 3, ET injection resulted in thermal hyperalgesia accompanied by a significant decrease in neurogenesis...
February 15, 2018: Journal of Neuroimmunology
https://www.readbyqxmd.com/read/29304243/hyperexcitability-of-the-central-nervous-system-in-children-with-chronic-pain-a-systematic-review
#18
Roselien Pas, Kelly Ickmans, Sophie Van Oosterwijck, Kelly Van der Cruyssen, Anthe Foubert, Laurence Leysen, Jo Nijs, Mira Meeus
Objective: Hyperexcitability of the central nervous system plays an important role in the development and maintenance of chronic pain in adults. This knowledge has led to improved treatment strategies within this population. In children, however, research on the presence of central hyperexcitability is scarce. To further investigate this topic in children with chronic pain, there is a need for a clear literature overview. Design: Systematic review. Methods: The literature search was performed using the electronic databases PubMed and Web of Science...
January 2, 2018: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/29299193/quetiapine-reverses-paclitaxel-induced-neuropathic-pain-in-mice-role-of-alpha2-adrenergic-receptors
#19
Alireza Abed, Mohammad Javad Khoshnoud, Mehdi Taghian, Mahbubeh Aliasgharzadeh, Azam Mesdaghinia
Objectives: Paclitaxel-induced peripheral neuropathy is a common adverse effect of cancer chemo -therapy. This neuropathy has a profound impact on quality of life and patient's survival. Preventing and treating paclitaxel-induced peripheral neuropathy is a major concern. First- and second-generation antipsychotics have shown analgesic effects both in humans and animals. Quetiapine is a novel atypical antipsychotic with low propensity to induce extrapyramidal or hyperprolactinemia side effects...
November 2017: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/29295977/staphylococcus-aureus-produces-pain-through-pore-forming-toxins-and-neuronal-trpv1-that-is-silenced-by-qx-314
#20
Kimbria J Blake, Pankaj Baral, Tiphaine Voisin, Ashira Lubkin, Felipe Almeida Pinho-Ribeiro, Kelsey L Adams, David P Roberson, Yuxin C Ma, Michael Otto, Clifford J Woolf, Victor J Torres, Isaac M Chiu
The hallmark of many bacterial infections is pain. The underlying mechanisms of pain during live pathogen invasion are not well understood. Here, we elucidate key molecular mechanisms of pain produced during live methicillin-resistant Staphylococcus aureus (MRSA) infection. We show that spontaneous pain is dependent on the virulence determinant agr and bacterial pore-forming toxins (PFTs). The cation channel, TRPV1, mediated heat hyperalgesia as a distinct pain modality. Three classes of PFTs-alpha-hemolysin (Hla), phenol-soluble modulins (PSMs), and the leukocidin HlgAB-directly induced neuronal firing and produced spontaneous pain...
January 2, 2018: Nature Communications
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