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stress induced hyperalgesia

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https://www.readbyqxmd.com/read/29351168/co-regulation-of-er-stress-and-oxidative-stress-in-neuropathic-pain-and-disinhibition-of-the-spinal-nociceptive-circuitry
#1
Yanhu Ge, Yingfu Jiao, Peiying Li, Zhenghua Xiang, Zhi Li, Long Wang, Wenqian Li, Hao Gao, Jiayun Shao, Daxiang Wen, Weifeng Yu
The accumulation of unfolded or misfolded proteins in the endoplasmic reticulum (ER) lumen leads to ER stress, which is related to cellular reactive oxygen species (ROS) production. Neuropathic pain may result from spinal dorsal horn (SDH) ER stress. In this study, we examined the cause-effect relationship between ER stress and neuropathic pain using the spinal nerve ligation(SNL) rat model. We showed that ER stress was mutually promotive with oxidative stress during the process. We also tested the hypothesis that spinal sensitization arose from reduced activities of GABA-ergic interneurons and that spinal sensitization was mediated by SDH ER stress...
January 18, 2018: Pain
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
#2
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/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
#3
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/29276736/maternal-separation-stress-leads-to-resilience-against-neuropathic-pain-in-adulthood
#4
Julien Genty, Milène Tetsi Nomigni, Fernand Anton, Ulrike Hanesch
Early life stress (ELS) leads to a permanent reprogramming of biochemical stress response cascades that may also be relevant for the processing of chronic pain states such as neuropathy. Despite clinical evidence, little is known about ELS-related vulnerability for neuropathic pain and the possibly underlying etiology. In the framework of experimental studies aimed at investigating the respective relationships we used the established ELS model of maternal separation (MS). Rat dams and neonates were separated for 3 h/day from post-natal day 2-12...
February 2018: Neurobiology of Stress
https://www.readbyqxmd.com/read/29241836/opposite-effects-of-stress-on-pain-modulation-depend-on-the-magnitude-of-individual-stress-response
#5
Nirit Geva, Ruth Defrin
The effect of acute stress on pain threshold and intolerance threshold are reported as producing either hypoalgesia or hyperalgesia. Yet, the contribution of individual stress reactivity in this respect has not been established. The aim was to test two pain modulation paradigms under acute stress manipulation, here for the first time, in order to study whether stress differentially affects pain modulation, and whether the effect is related to individual stress response. Participants were 31 healthy subjects...
December 11, 2017: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/29235496/involvement-of-trpm2-and-trpv1-channels-on-hyperalgesia-apoptosis-and-oxidative-stress-in-rat-fibromyalgia-model-protective-role-of-selenium
#6
Esra Yüksel, Mustafa Nazıroğlu, Mehmet Şahin, Bilal Çiğ
Fibromyalgia (FM) results in pain characterized by low selenium (Se) levels, excessive Ca2+ influx, reactive oxygen species (ROS) production, and acidic pH. TRPM2 and TRPV1 are activated by ROS and acid; nevertheless, their roles have not been elucidated in FM. Therefore, we investigated the contribution of TRPM2 and TRPV1 to pain, oxidative stress, and apoptosis in a rat model of FM and the therapeutic potential of Se. Thirty-six rats were divided into four groups: control, Se, FM, and FM + Se. The Se treatment reduced the FM-induced increase in TRPM2 and TRPV1 currents, pain intensity, intracellular free Ca2+, ROS, and mitochondrial membrane depolarization in the sciatic (SciN) and dorsal root ganglion (DRGN) neurons...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29197723/the-flavonoid-quercetin-inhibits-titanium-dioxide-tio2-induced-chronic-arthritis-in-mice
#7
Sergio M Borghi, Sandra S Mizokami, Felipe A Pinho-Ribeiro, Victor Fattori, Jefferson Crespigio, Juliana T Clemente-Napimoga, Marcelo H Napimoga, Dimitrius L Pitol, João P M Issa, Sandra Y Fukada, Rubia Casagrande, Waldiceu A Verri
Titanium dioxide (TiO2) is a common component of orthopedic prosthesis. However, prosthesis wear releases TiO2, which induces inflammation and osteolysis in peri-prosthetic tissues. Quercetin is a flavonoid widely present in human diet, which presents biological activities such as antinociceptive, anti-inflammatory and antioxidant effects. Therefore, the effect of intraperitoneal treatment with quercetin in TiO2-induced arthritis model was evaluated. In the first set of experiments, mice received injection of TiO2 (0...
November 5, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/29175003/transcranial-direct-current-stimulation-tdcs-prevents-chronic-stress-induced-hyperalgesia-in-rats
#8
F Fregni, I C Macedo, L N Spezia-Adachi, V L Scarabelot, G Laste, A Souza, Paulo Roberto Stefani Sanches, W Caumo, I L S Torres
BACKGROUND: Chronic stress (CS) is associated with a decrease in pain threshold caused by the changes in neural pain circuits. It can be associated to glucocorticoid imbalance with alterations in neural circuitry. Inhibition of stress-induced pain-related neural changes by using techniques that safely induce neuroplasticity such as transcranial direct current stimulation (tDCS) may prevent hyperalgesia triggered by CS. OBJECTIVE: This study aimed to verify the effect of tDCS performed prior to CS exposure on nociceptive response...
November 16, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/29159784/g2a-as-a-threshold-regulator-of-inflammatory-hyperalgesia-modulates-chronic-hyperalgesia
#9
Yeu-Shiuan Su, Yu-Fen Huang, Jen Wong, Chia-Wei Lee, Wei-Shan Hsieh, Wei-Hsin Sun
Tissue injury, pathogen infection, and diseases are often accompanied by inflammation to release mediators that sensitize nociceptors and further recruit immune cells, which can lead to chronic hyperalgesia and inflammation. Tissue acidosis, occurring at the inflammatory site, is a major factor contributing to pain and hyperalgesia. The receptor G2 accumulation (G2A), expressed in neurons and immune cells, responds to protons or oxidized free fatty acids such as 9-hydroxyoctadecadienoic acid produced by injured cells or oxidative stresses...
November 21, 2017: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/29159712/effect-of-kaempferol-isolated-from-seeds-of-eruca-sativa-on-changes-of-pain-sensitivity-in-streptozotocin-induced-diabetic-neuropathy
#10
Lalit Kishore, Navpreet Kaur, Randhir Singh
Generation of excessive reactive oxygen species (ROS) and advanced glycation end products (AGEs), and cellular apoptosis are implicated in the pathogenesis of diabetic neuropathy. Present study was aimed to explore the effect of Eruca sativa and Kaempferol (KP) on hyperalgesia (thermal and mechanical); tactile allodynia, motor nerve conduction velocity (MNCV) and oxidative-nitrosative stress in streptozotocin (STZ) induced experimental diabetes. Neuropathy developed in diabetic rats was evident from a marked hyperalgesia and allodynia; reduced MNCV associated with excess formation of AGEs and ROS...
November 20, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/29154836/a-new-promising-simultaneous-approach-for-attenuating-type-ii-diabetes-mellitus-induced-neuropathic-pain-in-rats-inos-inhibition-and-neuroregeneration
#11
Abhilasha Ahlawat, Saurabh Sharma
In view of the pathologic basis for the treatment of diabetic neuropathy, it is important to enhance nerve regeneration as well as prevent nerve degeneration. So, in the present study, we have investigated the effect of S-Methylisothiourea Sulfate (selective iNOS inhibitor) and Citicoline, alone and in combination, on Type II diabetes mellitus induced neuropathic pain in wistar rats. Type II diabetes was induced by providing high fat diet and low dose of Streptozotocin for 35 days in rats. Type II diabetes mellitus was assessed in terms of increased glucose, triglycerides, cholesterol, LDL levels, glucose tolerance and decrease in HDL levels...
November 14, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29076919/bdnf-mediated-projection-specific-regulation-of-depressive-like-and-nociceptive-behaviors-in-mesolimbic-reward-circuitry
#12
Di Liu, Qian-Qian Tang, Cui Yin, Yu Song, Yan Liu, Jun-Xia Yang, He Liu, Yue- Man Zhang, Si-Yin Wu, Ying Song, Barbara Juarez, Hai-Lei Ding, Ming-Hu Han, Hongxing Zhang, Jun-Li Cao
Increasing evidence suggests that mesolimbic reward system plays critical roles in the regulation of depression and nociception; however, its circuitry and cellular mechanisms remain unclear. In this study, we investigated the output-specific regulatory roles of dopaminergic (DA) neurons within the ventral tegmental area (VTA) in depressive-like and nociceptive behaviors in mice subjected to chronic unpredictable mild stress (CMS), using the projection-specific electrophysiological recording, pharmacological manipulation, behavioral test, and molecular biology technologies...
October 13, 2017: Pain
https://www.readbyqxmd.com/read/29022756/soluble-guanylyl-cyclase-is-a-critical-regulator-of-migraine-associated-pain
#13
Manel Ben Aissa, Alycia F Tipton, Zachariah Bertels, Ronak Gandhi, Laura S Moye, Madeline Novack, Brian M Bennett, Yueting Wang, Vladislav Litosh, Sue H Lee, Irina N Gaisina, Gregory Rj Thatcher, Amynah A Pradhan
Background Nitric oxide (NO) has been heavily implicated in migraine. Nitroglycerin is a prototypic NO-donor, and triggers migraine in humans. However, nitroglycerin also induces oxidative/nitrosative stress and is a source of peroxynitrite - factors previously linked with migraine etiology. Soluble guanylyl cyclase (sGC) is the high affinity NO receptor in the body, and the aim of this study was to identify the precise role of sGC in acute and chronic migraine. Methods We developed a novel brain-bioavailable sGC stimulator (VL-102), and tested its hyperalgesic properties in mice...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/29017143/protective-effect-of-carvacrol-on-acetic-acid-induced-colitis
#14
Marilia Trindade de Santana Souza, Daiane Franco Teixeira, Janaíne Prata de Oliveira, Alan Santos Oliveira, Lucindo José Quintans-Júnior, Cristiane Bani Correa, Enilton Aparecido Camargo
The pharmacological therapy for inflammatory bowel diseases continues to be problematic, and requires new alternative options. In this study, we tested the hypothesis that carvacrol (CAR), a phenolic monoterpene with anti-inflammatory and antioxidant activities, can treat experimental colitis in mice. C57BL/6 mice (n=8/group) were subjected to intrarectal administration of acetic acid (5%) to induce colitis. Mice were pretreated with CAR (25, 50 or 100mg/kg, p.o.) every 12h for three days prior to the induction...
October 7, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28984399/characterization-of-a-novel-capsaicin-heat-ongoing-pain-model
#15
R C Price, W Gandhi, C Nadeau, R Tarnavskiy, A Qu, E Fahey, L Stone, P Schweinhardt
BACKGROUND: Human experimental pain models provide an important translational link between pre-clinical models and clinical pain. Using topical capsaicin and continuous heat application, the novel capsaicin/heat ongoing pain (CHOP) model induces long-lasting experimental pain of which the perceived intensity can be individually adjusted. METHODS: In the CHOP model, capsaicin or control cream is applied to a 10 × 10 cm skin area and a heating pad is applied over the area after cream removal...
October 6, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28969521/the-role-of-glutamate-and-its-receptors-in-central-nervous-system-in-stress-induced-hyperalgesia
#16
Yan-Na Lian, Qi Lu, Jin-Long Chang, Ying Zhang
PURPOSE: To explore the potential mechanisms of glutamate and its receptors in stress-induced hyperalgesia. MATERIALS AND METHODS: The stress-induced hyperalgesia, glutamate and its receptors are listed as key items in the pubmed database and the related articles are searched. RESULTS: Glutamate level is increased under stress and associated with stress-induced hyperalgesia. Moreover, the role of glutamate in stress-induced hyperalgesia depends on its subtypes of its receptors...
November 3, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/28947488/treatment-with-sulforaphane-produces-antinociception-and-improves-morphine-effects-during-inflammatory-pain-in-mice
#17
Alejandro Redondo, Pablo Aníbal Ferreira Chamorro, Gabriela Riego, Sergi Leánez, Olga Pol
The activation of nuclear factor erythroid 2-related factor 2 (Nrf2) exerts potent antioxidative and anti-inflammatory effects; however, its participation in the modulation of chronic inflammatory pain and on the antinociceptive effects of μ-opioid receptor (MOR) agonists has not been evaluated. We investigated whether the induction of Nrf2 could alleviate chronic inflammatory pain and augment the analgesic effects of morphine and mechanisms implicated. In male C57BL/6 mice with inflammatory pain induced by complete Freund's adjuvant (CFA) subplantarly administered, we assessed: 1) antinociceptive actions of the administration of 5 and 10 mg/kg of a Nrf2 activator, sulforaphane (SFN); and 2) effects of SFN on the antinociceptive actions of morphine and on protein levels of Nrf2, heme oxygenase 1 (HO-1), and NAD(P)H: quinone oxidoreductase 1 (NQO1) enzymes, microglial activation and inducible nitric oxide synthase (NOS2) overexpression, as well as on mitogen-activated protein kinase (MAPK) and MOR expression in the spinal cord and paw of animals with inflammatory pain...
December 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28934532/preemptive-caffeine-administration-blocks-the-increase-in-postoperative-pain-caused-by-previous-sleep-loss-in-the-rat-a-potential-role-for-preoptic-adenosine-a2a-receptors-in-sleep-pain-interactions
#18
Viviane S Hambrecht-Wiedbusch, Maya Gabel, Linda J Liu, John P Imperial, Angelo V Colmenero, Giancarlo Vanini
Sleep and pain are reciprocally related, but the precise mechanisms underlying this relationship are poorly understood. This study used a rat model of surgical pain to examine the effect of previous sleep loss on postoperative pain and tested the hypothesis that preoptic adenosinergic mechanisms regulate sleep-pain interactions. Relative to ad libitum sleep, 6 hours of total sleep deprivation prior to a surgical incision significantly enhanced postoperative mechanical hypersensitivity in the affected paw and prolonged the time to recovery from surgery...
September 1, 2017: Sleep
https://www.readbyqxmd.com/read/28931335/activation-of-erk-signalling-by-src-family-kinases-sfks-in-drg-neurons-contributes-to-hydrogen-peroxide-h2o2-induced-thermal-hyperalgesia
#19
Ajeet Kumar Singh, Manjula Vinayak
Concomitant generation of reactive oxygen species during tissue inflammation has been recognised as a major factor for the development and the maintenance of hyperalgesia, out of which H2O2 is the major player. However, molecular mechanism of H2O2 induced hyperalgesia is still obscure. The aim of present study is to analyse the mechanism of H2O2-induced hyperalgesia in rats. Intraplantar injection of H2O2 (5, 10 and 20 µmoles/paw) induced a significant thermal hyperalgesia in the hind paw, confirmed by increased c-Fos activity in dorsal horn of spinal cord...
October 2017: Free Radical Research
https://www.readbyqxmd.com/read/28888088/possible-modulation-of-ppar-%C3%AE-cascade-against-depression-caused-by-neuropathic-pain-in-rats
#20
Shanky Garg, Vishwajit Ravindra Deshmukh, Pranav Prasoon
BACKGROUND: Sciatic nerve ligation causes neuropathic pain with chronic constriction injury (CCI). However, there is no published report on the effect of pioglitazone as an antidepressant in the treatment of depression induced by neuropathic pain with CCI in rats. The aim of this study was to evaluate the effect of pioglitazone as an antidepressant by targeting oxidative stress by the peripheral neuropathic pain model using the CCI of the sciatic nerve. METHODS: Behavioral studies were carried out to measure thermal hyperalgesia and cold allodynia as markers of neuropathic pain and force swim test for depression...
November 27, 2017: Journal of Basic and Clinical Physiology and Pharmacology
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