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https://www.readbyqxmd.com/read/28092666/loss-of-%C3%AE-opioid-receptor-signaling-in-nociceptors-but-not-microglia-abrogates-morphine-tolerance-without-disrupting-analgesia
#1
Gregory Corder, Vivianne L Tawfik, Dong Wang, Elizabeth I Sypek, Sarah A Low, Jasmine R Dickinson, Chaudy Sotoudeh, J David Clark, Ben A Barres, Christopher J Bohlen, Grégory Scherrer
Opioid pain medications have detrimental side effects including analgesic tolerance and opioid-induced hyperalgesia (OIH). Tolerance and OIH counteract opioid analgesia and drive dose escalation. The cell types and receptors on which opioids act to initiate these maladaptive processes remain disputed, which has prevented the development of therapies to maximize and sustain opioid analgesic efficacy. We found that μ opioid receptors (MORs) expressed by primary afferent nociceptors initiate tolerance and OIH development...
January 16, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28092651/long-lasting-antinociceptive-effects-of-green-light-in-acute-and-chronic-pain-in-rats
#2
Mohab M Ibrahim, Amol Patwardhan, Kerry B Gilbraith, Aubin Moutal, Xiaofang Yang, Lindsey A Chew, Tally Largent-Milnes, T Philip Malan, Todd W Vanderah, Frank Porreca, Rajesh Khanna
Treatments for chronic pain are inadequate, and new options are needed. Nonpharmaceutical approaches are especially attractive with many potential advantages including safety. Light therapy has been suggested to be beneficial in certain medical conditions such as depression, but this approach remains to be explored for modulation of pain. We investigated the effects of light-emitting diodes (LEDs), in the visible spectrum, on acute sensory thresholds in naive rats as well as in experimental neuropathic pain...
February 2017: Pain
https://www.readbyqxmd.com/read/28092649/new-onset-depression-following-stable-slow-and-rapid-rate-of-prescription-opioid-dose-escalation
#3
Joanne Salas, Jeffrey F Scherrer, Frank David Schneider, Mark D Sullivan, Kathleen K Bucholz, Thomas Burroughs, Laurel A Copeland, Brian K Ahmedani, Patrick J Lustman
Recent studies suggest that longer durations of opioid use, independent of maximum morphine equivalent dose (MED) achieved, is associated with increased risk of new-onset depression (NOD). Conversely, other studies, not accounting for duration, found that higher MED increased probability of depressive symptoms. To determine whether rate of MED increase is associated with NOD, a retrospective cohort analysis of Veterans Health Administration data (2000-2012) was conducted. Eligible patients were new, chronic (>90 days) opioid users, aged 18 to 80, and without depression diagnoses for 2 years before start of follow-up (n = 7051)...
February 2017: Pain
https://www.readbyqxmd.com/read/28092648/does-brief-chronic-pain-management-education-change-opioid-prescribing-rates-a-pragmatic-trial-in-australian-early-career-general-practitioners
#4
Simon Mark Holliday, Chris Hayes, Adrian J Dunlop, Simon Morgan, Amanda Tapley, Kim M Henderson, Mieke L van Driel, Elizabeth G Holliday, Jean I Ball, Andrew Davey, Neil Allan Spike, Lawrence Andrew McArthur, Parker John Magin
We aimed to evaluate the effect of pain education on opioid prescribing by early-career general practitioners. A brief training workshop was delivered to general practice registrars of a single regional training provider. The workshop significantly reduced "hypothetical" opioid prescribing (in response to paper-based vignettes) in an earlier evaluation. The effect of the training on "actual" prescribing was evaluated using a nonequivalent control group design nested within the Registrar Clinical Encounters in Training (ReCEnT) cohort study: 4 other regional training providers were controls...
February 2017: Pain
https://www.readbyqxmd.com/read/28092646/ex-vivo-nonviral-gene-delivery-of-%C3%AE-opioid-receptor-to-attenuate-cancer-induced-pain
#5
Seiichi Yamano, Chi T Viet, Dongmin Dang, Jisen Dai, Shigeru Hanatani, Tadahiro Takayama, Hironori Kasai, Kentaro Imamura, Ron Campbell, Yi Ye, John C Dolan, William Myung Kwon, Stefan D Schneider, Brian L Schmidt
Virus-mediated gene delivery shows promise for the treatment of chronic pain. However, viral vectors have cytotoxicity. To avoid toxicities and limitations of virus-mediated gene delivery, we developed a novel nonviral hybrid vector: HIV-1 Tat peptide sequence modified with histidine and cysteine residues combined with a cationic lipid. The vector has high transfection efficiency with little cytotoxicity in cancer cell lines including HSC-3 (human tongue squamous cell carcinoma) and exhibits differential expression in HSC-3 (∼45-fold) relative to HGF-1 (human gingival fibroblasts) cells...
February 2017: Pain
https://www.readbyqxmd.com/read/28092324/long-term-use-of-opioids-for-nonmalignant-pain-among-community-dwelling-persons-with-and-without-alzheimer-disease-in-finland-a-nationwide-register-based-study
#6
Aleksi Hamina, Heidi Taipale, Antti Tanskanen, Anna-Maija Tolppanen, Niina Karttunen, Liisa Pylkkänen, Jari Tiihonen, Sirpa Hartikainen
Persons with Alzheimer disease (AD) commonly present with chronic nonmalignant pain, but long-term use of opioids among this population has not been studied previously. Our aim was to investigate the prevalence of long-term (≥180 days) use of opioids for nonmalignant pain and associated factors among community-dwelling persons with AD and to compare the prevalence with a matched cohort without AD. The Medication use and Alzheimer's disease (MEDALZ) cohort was used for this study, comprising all community-dwelling persons diagnosed with AD in Finland during 2005 to 2011 and their matched comparison persons without AD...
February 2017: Pain
https://www.readbyqxmd.com/read/28092323/brain-substrates-of-reward-processing-and-the-%C3%AE-opioid-receptor-a-pathway-into-pain
#7
Frauke Nees, Susanne Becker, Sabina Millenet, Tobias Banaschewski, Luise Poustka, Arun Bokde, Uli Bromberg, Christian Büchel, Patricia J Conrod, Sylvane Desrivières, Vincent Frouin, Jürgen Gallinat, Hugh Garavan, Andreas Heinz, Bernd Ittermann, Jean-Luc Martinot, Dimitri Papadopoulos Orfanos, Tomáš Paus, Michael N Smolka, Henrik Walter, Rob Whelan, Gunter Schumann, Herta Flor
The processing of reward and reinforcement learning seems to be important determinants of pain chronicity. However, reward processing is already altered early in life and if this is related to the development of pain symptoms later on is not known. The aim of this study was first to examine whether behavioural and brain-related indicators of reward processing at the age of 14 to 15 years are significant predictors of pain complaints 2 years later, at 16 to 17 years. Second, we investigated the contribution of genetic variations in the opioidergic system, which is linked to the processing of both, reward and pain, to this prediction...
February 2017: Pain
https://www.readbyqxmd.com/read/28088507/patient-reported-outcomes-and-opioid-use-in-outpatients-with-chronic-pain
#8
Lisa R Witkin, David Zylberger, Neel Mehta, Madeleine Hindenlang, Christopher Johnson, Jacob Kean, Susan D Horn, Charles E Inturrisi
: The Weill Cornell Medical College (WCMC) Pain Registry database contains patient characteristics, treatments, and outcomes for a prospective cohort of 1159 chronic pain patients who were seen at the WCMC Pain Medicine outpatient clinic from 7/08/2011 to 12/10/2014. Patients aged 45-64 comprised 43% followed by age >=65 at 37%. Fifty-eight percent were female. Average pain intensity (Brief Pain Inventory) was reported as mild by 22.3% of patients, moderate by 34.7%, and severe by 43...
January 11, 2017: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/28086853/taking-action-to-reduce-pain-action-study-rationale-design-and-protocol-of-a-randomized-trial-of-a-proactive-telephone-based-coaching-intervention-for-chronic-musculoskeletal-pain-among-african-americans
#9
Rozina H Bhimani, Lee J S Cross, Brent C Taylor, Laura A Meis, Steven S Fu, Kelli D Allen, Sarah L Krein, Tam Do, Robert D Kerns, Diana J Burgess
BACKGROUND: Rates of chronic pain are rising sharply in the United States and worldwide. Presently, there is evidence of racial disparities in pain treatment and treatment outcomes in the United States but few interventions designed to address these disparities. There is growing consensus that chronic musculoskeletal pain is best addressed by a biopsychosocial approach that acknowledges the role of psychological and environmental factors, some of which differ by race. METHODS/DESIGN: The primary aim of this randomized controlled trial is to test the effectiveness of a non-pharmacological, self-regulatory intervention, administered proactively by telephone, at improving pain outcomes and increasing walking among African American patients with hip, back and knee pain...
January 13, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28081197/morphine-withdrawal-modifies-prion-protein-expression-in-rat-hippocampus
#10
Vincenzo Mattei, Stefano Martellucci, Francesca Santilli, Valeria Manganelli, Tina Garofalo, Niccolò Candelise, Alessandra Caruso, Maurizio Sorice, Sergio Scaccianoce, Roberta Misasi
The hippocampus is a vulnerable brain structure susceptible to damage during aging and chronic stress. Repeated exposure to opioids may alter the brain so that it functions normally when the drugs are present, thus, a prolonged withdrawal might lead to homeostatic changes headed for the restoration of the physiological state. Abuse of morphine may lead to Reacting Oxygen Species-induced neurodegeneration and apoptosis. It has been proposed that during morphine withdrawal, stress responses might be responsible, at least in part, for long-term changes of hippocampal plasticity...
2017: PloS One
https://www.readbyqxmd.com/read/28079573/medically-assisted-withdrawal-detoxification-considering-the-mother-infant-dyad
#11
Hendrée E Jones, Mishka Terplan, Marjorie Meyer
Recommendations for opioid agonist pharmacotherapy and against medically assisted withdrawal were based upon early reports that associated withdrawal with maternal relapse and fetal demise. Data from recent case series have called these recommendations into question. Although these data do not support an association between medically assisted withdrawal and fetal demise, relapse remains a significant clinical concern with reported rates ranging from 17% to 96% (average 48%). Given the high loss to follow-up in these studies, the actual relapse rate is likely even greater...
January 11, 2017: Journal of Addiction Medicine
https://www.readbyqxmd.com/read/28077540/leukemia-inhibitory-factor-lif-potentiates-antinociception-activity-and-inhibits-tolerance-induction-of-opioids
#12
H J Tu, K H Kang, S Y Ho, H C Liou, H H Liou, C P Lin, W M Fu
BACKGROUND: The efficacy of opioids typically decreases after long-term use owing to the development of tolerance. Glial activation and the upregulation of proinflammatory cytokines are related to the induction of tolerance. We investigated the effect of leukemia inhibitory factor (LIF) on morphine analgesia and tolerance. METHODS: LIF concentrations in rat spinal cords were measured by polymerase chain reaction (PCR) and enzyme-linked immunosorbent assay (ELISA) after morphine administration...
October 2016: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28076255/problem-drug-related-behavior-and-discontinuation-of-opioids-following-the-introduction-of-an-opioid-management-program
#13
Lucinda A Grande, Ellen Campbell Thompson, Margaret A Au, Devin Sawyer, Laura-Mae Baldwin, Roger Rosenblatt
PURPOSE: Problem drug-related behavior (PDB) among patients on chronic opioid therapy may reflect an opioid use disorder. This study assessed PDB prevalence and the relationship between PDB and ongoing prescription of opioids at a primary care clinic that implemented a multifaceted opioid management program. METHODS: A chart review of patients in a chronic opioid registry assessed prevalence of different types of PDB over 2 years, and whether opioids were prescribed during the last 3 months of the 2-year study period among patients with different levels of PDB...
November 2016: Journal of the American Board of Family Medicine: JABFM
https://www.readbyqxmd.com/read/28074831/rgs9-2-modulates-responses-to-oxycodone-in-pain-free-and-chronic-pain-states
#14
Sevasti Gaspari, Valeria Cogliani, Lefteris Manouras, Ethan M Anderson, Vasiliki Mitsi, Kleopatra Avrampou, Fiona B Carr, Venetia Zachariou
Regulator of G protein signalling 9-2 (RGS9-2) is a striatal enriched signal transduction modulator, known to play a critical role in the development of addiction-related behaviours following exposure to psychostimulants or opioids. RGS9-2 controls the function of several GPCRs, including dopamine and mu opioid (MOR) receptors. We previously showed that RGS9-2 complexes negatively control morphine analgesia, and promote the development of morphine tolerance. In contrast, RGS9-2 positively modulates the actions of other opioid analgesics, such as fentanyl and methadone...
January 11, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28072812/is-kratom-the-new-legal-high-on-the-block-the-case-of-an-emerging-opioid-receptor-agonist-with-substance-abuse-potential
#15
George C Chang-Chien, Charles A Odonkor, Prin Amorapanth
Kratom is an unscheduled opioid receptor agonist that comes in the form of dietary supplements currently being abused by chronic pain patients on prescription opioids. Active alkaloids isolated from kratom such as mitragynine and 7-hydroxymitragynine are thought to act on mu- and delta-opioid receptors as well as alpha-2 adrenergic and 5-HT2A receptors. Animal studies suggest that kratom may be more potent than morphine. Consequently, kratom consumption produces analgesic and euphoric feelings among users. In particular, some chronic pain patients on opioids take kratom to counteract the effects of opioid withdrawal...
January 2017: Pain Physician
https://www.readbyqxmd.com/read/28072811/evaluation-of-the-ototoxicity-potential-of-once-daily-single-entity-hydrocodone-in-patients-with-chronic-pain-results-of-two-phase-3-clinical-studies
#16
Kathleen Campbell, J Walter Kutz, Angela Shoup, Warren Wen, Shau Yu Lynch, Ellie He, Steven R Ripa
BACKGROUND: Use/misuse of the opioid combination hydrocodone-acetaminophen has been associated with permanent hearing loss. Although reports have been rare, this potential effect can have significant detrimental effect on patients' overall quality of life. To date, the ototoxic effect of hydrocodone alone has not been systematically investigated. OBJECTIVE: In this report, we aimed to evaluate the potential ototoxicity of a novel, single-entity, once-daily, extended-release hydrocodone tablet (Hysingla® ER; HYD)...
January 2017: Pain Physician
https://www.readbyqxmd.com/read/28072795/treatment-outcomes-for-patients-with-failed-back-surgery
#17
Jae Hwan Cho, Jae Hyup Lee, Kwang Sup Song, Jae-Young Hong, Yoon-Suk Joo, Dong-Ho Lee, Chang Ju Hwang, Choon Sung Lee
BACKGROUND: Failed back surgery syndrome (FBSS) is a frequently encountered disease entity following lumbar spinal surgery. Although many plausible reasons have been investigated, the exact pathophysiology remains unknown. Various medications, reoperations, interventions such as spinal cord stimulation, epidural adhesiolysis or epidural injection, exercise therapy, and psychotherapy have been suggested treatment options. However, the evidence of the clinical outcome for each treatment has not been clearly determined...
January 2017: Pain Physician
https://www.readbyqxmd.com/read/28071341/identification-of-novel-hits-as-highly-prospective-dual-agonists-for-mu-and-kappa-opioid-receptors-an-integrated-in-silico-approach
#18
Indrani Bera, Mrinal Vishwas Marathe, Pavan V Payghan, Nanda Ghoshal
Opioid agonists are used clinically for the treatment of acute and chronic pain, however, their clinical use is limited due to the presence of undesired side effects. Dual agonists, simultaneously targeting mu and kappa opioid receptors, show fewer side effects than that of selective agonists. In the present work, 2D- and 3D- Quantitative Structure Activity Relationship studies were performed on a series of aminomorphinan derivatives as dual agonists, using a wide range of descriptors. The aim of the study was to identify the structural requirements for the activity of these compounds towards mu and kappa opioid receptors and using the models, with best external predictability, for predicting the activities of new hits obtained from shape based virtual screening of drug like compounds from ZINC database...
January 10, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28067693/intraoperative-ketamine-reduces-immediate-postoperative-opioid-consumption-after-spinal-fusion-surgery-in-chronic-pain-patients-with-opioid-dependency-a-randomized-blinded-trial
#19
Rikke Vibeke Nielsen, Jonna Storm Fomsgaard, Hanna Siegel, Robertas Martusevicius, Lone Nikolajsen, Jørgen Berg Dahl, Ole Mathiesen
Perioperative handling of surgical patients with opioid dependency represents an important clinical problem. Animal studies suggest that ketamine attenuates central sensitization and hyperalgesia and thereby reduces postoperative opioid tolerance. We hypothesized that intraoperative ketamine would reduce immediate postoperative opioid consumption compared to placebo in chronic pain patients with opioid dependency undergoing lumbar spinal fusion surgery. Primary outcome was morphine consumption 0-24 h postoperatively...
January 6, 2017: Pain
https://www.readbyqxmd.com/read/28065792/the-analgesic-effects-of-oxytocin-in-the-peripheral-and-central-nervous-system
#20
Qing Xin, Bo Bai, Wenyan Liu
Pain is a ubiquitously unpleasant feeling among humans as well as many animal species often caused by actual and potential tissue damage. However, it is absolutely crucial for our survival in many ways. Acute pain can signal the presence of danger or life-threatenting events, which help escape noxious stimuli. By contrast, when pain becomes chronic or persistent, it becomes an encumbrance and exerts deleterious effects to the body and mind, often co-occured with anxiety and depression. Additionaly, chronic pain is more or less an economic burden for the patients because it requires immediate medical treatments and seriously hinders pepople in their work...
January 5, 2017: Neurochemistry International
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