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Opioid hyperalgesia

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https://www.readbyqxmd.com/read/28343361/genetic-dissociation-of-morphine-analgesia-from-hyperalgesia-in-mice
#1
Gina F Marrone, Valerie Le Rouzic, Andras Varadi, Jin Xu, Anjali M Rajadhyaksha, Susruta Majumdar, Ying-Xian Pan, Gavril W Pasternak
RATIONALE: Morphine is the prototypic mu opioid, producing its analgesic actions through traditional 7 transmembrane domain (7TM) G-protein-coupled receptors generated by the mu opioid receptor gene (Oprm1). However, the Oprm1 gene undergoes extensive alternative splicing to yield three structurally distinct sets of splice variants. In addition to the full-length 7TM receptors, it produces a set of truncated variants comprised of only 6 transmembrane domains (6TM). OBJECTIVES: This study explored the relative contributions of 7TM and 6TM variants in a range of morphine actions...
March 25, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28341079/monitoring-of-nociception-reality-or-fiction
#2
A Abad-Gurumeta, J Ripollés-Melchor, R Casans-Francés, J M Calvo-Vecino
There are currently various projects underway that attempt to monitor the nociceptive responses caused by surgical stress and ensure patients the best analgesic conditions. The systemic response to surgical stress has repercussions in the postoperative period, such as worse pain control, delayed recovery, greater complications, longer stay in resuscitation and hospital units, and increased healthcare costs. However, treatment with higher doses of opioids than necessary may lead to slower awakening, increased drowsiness and adverse effects, as well as situations of postoperative opioid-induced hyperalgesia...
March 21, 2017: Revista Española de Anestesiología y Reanimación
https://www.readbyqxmd.com/read/28340258/hydrocodone-is-more-effective-than-morphine-or-oxycodone-in-suppressing-the-development-of-burn-induced-mechanical-allodynia
#3
Michael A Emery, M L Shawn Bates, Paul J Wellman, Shoshana Eitan
Background. : Pain is the most frequent complaint of burn-injured patients. Opioids are commonly used in the course of treatment. However, there is a lack of rodent studies that examine the differential effects of various opioids on burn pain. Objective. : This study compared the ability of morphine, oxycodone, and hydrocodone to suppress the development of burn-induced mechanical allodynia and reduce pain sensitivity. Methods. : Mice were examined for their baseline pain sensitivity thresholds using the von Frey Filaments test...
March 18, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/28328571/neuropathic-pain-induced-enhancement-of-spontaneous-and-pain-evoked-neuronal-activity-in-the-periaqueductal-gray-that-is-attenuated-by-gabapentin
#4
Vijay K Samineni, Louis S Premkumar, Carl L Faingold
Neuropathic pain is a debilitating pathological condition that is poorly understood. Recent evidence suggests that abnormal central processing occurs during the development of neuropathic pain induced by the cancer chemotherapeutic agent, paclitaxel. Yet, it is unclear what role neurons in supraspinal pain network sites, such as the periaqueductal gray, play in altered behavioral sensitivity seen during chronic pain conditions. To elucidate these mechanisms, we studied the spontaneous and thermally-evoked firing patterns of ventrolateral periaqueductal gray (vlPAG) neurons in awake behaving rats treated with paclitaxel to induce neuropathic pain...
March 21, 2017: Pain
https://www.readbyqxmd.com/read/28319527/hydrocodone-but-neither-morphine-nor-oxycodone-is-effective-in-suppressing-burn-induced-mechanical-allodynia-in-the-uninjured-foot-contralateral-to-the-burn
#5
Michael A Emery, M L Shawn Bates, Paul J Wellman, Shoshana Eitan
Opioids are commonly used to treat severe, burn-induced pain. However, there is a lack of rodent studies that examine the differential effects of various opioids on burn pain. The authors recently demonstrated that hydrocodone was superior to other opioids in suppressing the development of burn-induced mechanical allodynia in the burned limb. This study monitored the development of mechanical allodynia and compared the abilities of morphine, oxycodone, and hydrocodone to reduce burn-induced mechanical allodynia in the limb contralateral to the burn...
March 13, 2017: Journal of Burn Care & Research: Official Publication of the American Burn Association
https://www.readbyqxmd.com/read/28314949/tolerance-and-cross-tolerance-to-the-antinociceptive-effects-of-oxycodone-and-the-imidazoline-i2-receptor-agonist-phenyzoline-in-adult-male-rats
#6
David A Thorn, Yanan Zhang, Jun-Xu Li
RATIONALE: Emerging evidence suggests the potential utility of combining opioids with imidazoline I2 receptor agonists for chronic pain. However, chronic pain management requires prolonged pharmacotherapy, and the consequence of such combination therapy remains unclear. OBJECTIVE: This study examined the anti-hyperalgesic effect of the opioid oxycodone, the selective I2 receptor agonist phenyzoline, alone and in combination, during prolonged treatment. METHODS: Von Frey filament test was used to examine the anti-hyperalgesic effect of drugs in complete Freund's adjuvant (CFA)-induced inflammatory pain or chronic constriction injury (CCI)-induced neuropathic pain in rats...
March 17, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28306605/hyperalgesic-priming-type-ii-induced-by-repeated-opioid-exposure-maintenance-mechanisms
#7
Dioneia Araldi, Luiz F Ferrari, Jon D Levine
We previously developed a model of opioid-induced neuroplasticity in the peripheral terminal of the nociceptor that could contribute to opioid-induced hyperalgesia, type II hyperalgesic priming. Repeated administration of mu-opioid receptor (MOR) agonists, such as DAMGO, at the peripheral terminal of the nociceptor, induces long-lasting plasticity expressed, prototypically as opioid-induced hyperalgesia and prolongation of prostaglandin-E2-induced hyperalgesia. In this study, we evaluated the mechanisms involved in the maintenance of type II priming...
March 14, 2017: Pain
https://www.readbyqxmd.com/read/28291541/evidence-for-a-novel-neurohumoral-antinociceptive-mechanism-mediated-by-peripheral-capsaicin-sensitive-nociceptors-in-conscious-rats
#8
Gábor Pethő, Kata Bölcskei, Réka Füredi, Bálint Botz, Teréz Bagoly, Erika Pintér, János Szolcsányi
Stimulation of capsaicin-sensitive peripheral sensory nerve terminals induces remote anti-inflammatory effects throughout the body of anesthetized rats and guinea-pigs mediated by somatostatin. As somatostatin has also antinociceptive effects, the study aimed at investigating whether similar remote antinociceptive effects can be demonstrated in awake animals. In conscious rats, nociceptive nerve endings of the right hind paw decentralized by cutting the sciatic and saphenous nerves 18h before were chemically stimulated, and drop of the noxious heat threshold (heat hyperalgesia) induced by prior (18h before) plantar incision was measured on the contralateral, left hind paw using an increasing-temperature water bath...
February 10, 2017: Neuropeptides
https://www.readbyqxmd.com/read/28288815/rf313-an-orally-bioavailable-neuropeptide-ff-receptor-antagonist-opposes-effects-of-rf-amide-related-peptide-3-and-opioid-induced-hyperalgesia-in-rodents
#9
Khadija Elhabazi, Jean-Paul Humbert, Isabelle Bertin, Raphaelle Quillet, Valérie Utard, Martine Schmitt, Jean-Jacques Bourguignon, Emilie Laboureyras, Meric Ben Boujema, Guy Simonnet, Caroline Ancel, Valérie Simonneaux, Massimiliano Beltramo, Bernard Bucher, Tania Sorg, Hamid Meziane, Elodie Schneider, Benoit Petit-Demoulière, Brigitte Ilien, Frédéric Bihel, Frédéric Simonin
Although opiates represent the most effective analgesics, their use in chronic treatments is associated with numerous side effects including the development of pain hypersensitivity and analgesic tolerance. We recently identified a novel orally active neuropeptide FF (NPFF) receptor antagonist, RF313, which efficiently prevents the development of fentanyl-induced hyperalgesia in rats. In this study, we investigated the properties of this compound into more details. We show that RF313 exhibited a pronounced selectivity for NPFF receptors, antagonist activity at NPFF1 receptor (NPFF1R) subtype both in vitro and in vivo and no major side effects when administered in mice up to 30 mg/kg...
March 10, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28274109/what-is-new-in-rome-iv
#10
REVIEW
Max J Schmulson, Douglas Arnold Drossman
Functional gastrointestinal disorders (FGIDs) are diagnosed and classified using the Rome criteria; the criteria may change over time as new scientific data emerge. The Rome IV was released in May 2016. The aim is to review the main changes in Rome IV. FGIDs are now called disorders of gut-brain interaction (DGBI). Rome IV has a multicultural rather than a Western-culture focus. There are new chapters including multicultural, age-gender-women's health, intestinal microenvironment, biopsychosocial, and centrally mediated disorders...
March 9, 2017: Journal of Neurogastroenterology and Motility
https://www.readbyqxmd.com/read/28252574/abcb1-polymorphisms-and-cold-pressor-pain-responses-opioid-dependent-patients-on-methadone-maintenance-therapy
#11
Zalina Zahari, Chee Siong Lee, Muslih Abdulkarim Ibrahim, Nurfadhlina Musa, Mohd Azhar Mohd Yasin, Yeong Yeh Lee, Soo Choon Tan, Nasir Mohamad, Rusli Ismail
BACKGROUND: Methadone is a substrate of the P-glycoprotein efflux transporter, which is encoded by ABCB1 (MDR1), and thus, ABCB1 polymorphisms may influence the transport of methadone at the blood-brain barrier, affecting its adverse effects. OBJECTIVES: This study investigated the association between ABCB1 polymorphisms and cold pressor pain responses among opioid-dependent patients on methadone maintenance therapy (MMT). METHODS: Malay male opioid-dependent patients receiving MMT (n = 148) were recruited...
March 2017: Nursing Research
https://www.readbyqxmd.com/read/28239510/lidocaine-infusion-a-promising-therapeutic-approach-for-chronic-pain
#12
Enas Kandil, Emily Melikman, Bryon Adinoff
Opioid abuse is a national epidemic in the United States, where it is estimated that a prescription drug overdose death occurs every 19 minutes. While opioids are highly effective in acute and subacute pain control, their use for treatment of chronic pain is controversial. Chronic opioids use is associated with tolerance, dependency, hyperalgesia. Although there are new strategies and practice guidelines to reduce opioid dependence and opioid prescription drug overdose, there has been little focus on development of opioid-sparing therapeutic approaches...
January 2017: Journal of Anesthesia & Clinical Research
https://www.readbyqxmd.com/read/28235500/action-of-%C3%AE-endorphin-and-nonsteroidal-anti-inflammatory-drugs-and-the-possible-effects-of-nonsteroidal-anti-inflammatory-drugs-on-%C3%AE-endorphin
#13
REVIEW
Yuan-Hang Luan, Di Wang, Qi Yu, Xiao-Qing Chai
This study aimed to review research on the effects of nonsteroidal anti-inflammatory drugs (NSAIDs) on β-endorphin. NSAIDs are commonly used as anti-inflammatory and analgesic drugs. They are well known for inducing peripheral analgesia by inhibiting cyclooxygenase (COX). However, an increasing number of studies have shown that NSAIDs have an analgesic effect not only in the periphery but also at the center. It means that a central analgesic mechanism of the action of NSAIDs exists besides the peripheral mechanism, and the central mechanism likely involves β-endorphin...
February 2017: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/28219639/leishmania-l-amazonensis-induces-hyperalgesia-in-balb-c-mice-contribution-of-endogenous-spinal-cord-tnf%C3%AE-and-nf%C3%AE%C2%BAb-activation
#14
Sergio M Borghi, Victor Fattori, Kenji W Ruiz-Miyazawa, Milena M Miranda-Sapla, Rúbia Casagrande, Phileno Pinge-Filho, Wander R Pavanelli, Waldiceu A Verri
Cutaneous leishmaniasis (CL) is the most common form of the leishmaniasis in humans. Ulcerative painless skin lesions are predominant clinical features of CL. Wider data indicate pain accompanies human leishmaniasis, out with areas of painless ulcerative lesions per se. In rodents, Leishmania (L.) major infection induces nociceptive behaviors that correlate with peripheral cytokine levels. However, the role of the spinal cord in pain processing after Leishmania infection has not been investigated. Balb/c mice received intraplantar (i...
February 17, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28216001/loperamide-inhibits-sodium-channels-to-alleviate-inflammatory-hyperalgesia
#15
Ying Wu, Beiyan Zou, Lingli Liang, Min Li, Yuan-Xiang Tao, Haibo Yu, Xiaoliang Wang, Min Li
Previous studies demonstrated that Loperamide, originally known as an anti-diarrheal drug, is a promising analgesic agent primarily targeting mu-opioid receptors. However some evidences suggested that non-opioid mechanisms may be contributing to its analgesic effect. In the present study, Loperamide was identified as a Nav1.7 blocker in a pilot screen. In HEK293 cells expressing Nav1.7 sodium channels, Loperamide blocked the resting state of Nav1.7 channels (IC50 = 1.86 ± 0.11 μM) dose-dependently and reversibly...
February 16, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28213891/opioids-and-the-immune-system-friend-or-foe
#16
REVIEW
Lisanne Mirja Plein, Heike L Rittner
Systemically administered opioids are among the most powerful analgesics for treating severe pain. Several negative side-effects (respiratory depression, addiction, nausea, confusion) and the risk of opioid-induced hyperalgesia accompany opioid administration. One other side effect is the potential of opioids to suppress the immune response and thereby to increase the vulnerability for infections. Several studies have investigated the link between opioids and immunosuppression in vitro, in vivo as well as in patients with divergent results: Exogenous opioids such as morphine and fentanyl can impair macrophage and natural killer cell as well as T cell function and weaken the gut barrier in vitro and in animal studies...
February 18, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28211895/electroacupuncture-attenuates-cfa-induced-inflammatory-pain-by-suppressing-nav1-8-through-s100b-trpv1-opioid-and-adenosine-pathways-in-mice
#17
Hsien-Yin Liao, Ching-Liang Hsieh, Chun-Ping Huang, Yi-Wen Lin
Pain is associated with several conditions, such as inflammation, that result from altered peripheral nerve properties. Electroacupuncture (EA) is a common Chinese clinical medical technology used for pain management. Using an inflammatory pain mouse model, we investigated the effects of EA on the regulation of neurons, microglia, and related molecules. Complete Freund's adjuvant (CFA) injections produced a significant mechanical and thermal hyperalgesia that was reversed by EA or a transient receptor potential V1 (TRPV1) gene deletion...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28199982/n-acetyl-cysteine-attenuates-remifentanil-induced-postoperative-hyperalgesia-via-inhibiting-matrix-metalloproteinase-9-in-dorsal-root-ganglia
#18
Yue Liu, Yuan Ni, Wei Zhang, Yu-E Sun, Zhengliang Ma, Xiaoping Gu
Treatment of remifentanil-induced postoperative hyperalgesia (RIH) remains a clinical challenge because the mechanisms are not fully understood. Matrix metalloproteinase-9 (MMP-9) is a key component in neuroinflammation because of its facilitation of pro-inflammatory cytokine maturation. Therefore, inhibition of MMP-9 may represent a novel therapeutic approach to the treatment of RIH. Sprague-Dawley rats were randomly divided into three groups: Control, Incision and Remifentanil. A right plantar surgical incision was performed in Group Incision, and intraoperative remifentanil (0...
February 9, 2017: Oncotarget
https://www.readbyqxmd.com/read/28190392/pi3k-akt-pathway-a-potential-therapeutic-target-for-chronic-pain
#19
Shu-Ping Chen, Ya-Qun Zhou, Dai-Qiang Liu, Wen Zhang, Anne Manyande, Xue-Hai Guan, Yu-Ke Tian, Da-Wei Ye, Deeq Mohamed Omar
Chronic pain is among the most disabling and costly disorders, with prevalence ranging from 10% to 55%. However, current therapeutic strategies for chronic pain are unsatisfactory due to our poor understanding of its mechanisms. Thus, novel therapeutic targets need to be found in order to improve these patients' quality of life. PI3K and its downstream Akt are widely expressed in the spinal cord, particularly in the laminae I-IV of the dorsal horn, where nociceptive C and Aδ fibers of primary afferents principally terminate...
February 10, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28179153/activation-of-npffr2-leads-to-hyperalgesia-through-the-spinal-inflammatory-mediator-cgrp-in-mice
#20
Ya-Tin Lin, Ho-Ling Liu, Yuan-Ji Day, Che-Chien Chang, Po-Hung Hsu, Jin-Chung Chen
Neuropeptide FF (NPFF) is recognized as an opioid modulating peptide that regulates morphine-induced analgesia. The aim of this study was to delineate the role of NPFFR2 in pain transmission. We found the expression levels of NPFF and NPFFR2 were increased in the lumbar dorsal horn of animals with CFA- and carrageenan-induced inflammation and both NPFFR2 over-expressing transgenic (NPFFR2-Tg) and NPFFR2 agonist-treated mice displayed hyperalgesia. BOLD signals from functional MRI showed that NPFFR2-Tg mice exhibited increased activation of pain-related brain regions after painful stimulation when compared to WT mice...
February 5, 2017: Experimental Neurology
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