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https://www.readbyqxmd.com/read/28212278/the-effect-of-the-human-peptide-ghk-on-gene-expression-relevant-to-nervous-system-function-and-cognitive-decline
#1
Loren Pickart, Jessica Michelle Vasquez-Soltero, Anna Margolina
Neurodegeneration, the progressive death of neurons, loss of brain function, and cognitive decline is an increasing problem for senior populations. Its causes are poorly understood and therapies are largely ineffective. Neurons, with high energy and oxygen requirements, are especially vulnerable to detrimental factors, including age-related dysregulation of biochemical pathways caused by altered expression of multiple genes. GHK (glycyl-l-histidyl-l-lysine) is a human copper-binding peptide with biological actions that appear to counter aging-associated diseases and conditions...
February 15, 2017: Brain Sciences
https://www.readbyqxmd.com/read/28212204/1-2-4-dibromophenyl-3-6-6-trimethyl-1-5-6-7-tetrahydro-4h-indazol-4-one-a-novel-opioid-receptor-agonist-with-less-accompanying-gastrointestinal-dysfunction-than-morphine
#2
Po-Kuan Chao, Shau-Hua Ueng, Li-Chin Ou, Teng-Kuang Yeh, Wan-Ting Chang, Hsiao-Fu Chang, Shu-Chun Chen, Pao-Luh Tao, Ping-Yee Law, Horace H Loh, Ming-Fu Cheng, Jian-Ying Chuang, Chiung-Tong Chen, Chuan Shih, Shiu-Hwa Yeh
BACKGROUND: The authors investigated the pharmacology and signaling pathways of the opioid receptors modulated by compound 1, 1-(2,4-dibromophenyl)-3,6,6-trimethyl-1,5,6,7-tetrahydro-4H-indazol-4-one. METHODS: In vitro studies of compound 1 were assessed by using a radioligand-binding assay (n = 3), a cyclic adenosine monophosphate assay (n = 3), a β-arrestin assay (n = 3), an internalization assay (n = 3), and an immunohistochemistry (n = 8). In vivo studies of compound 1 were characterized using a tail-flick test (n = 5 to 6), tail-clip test (n = 7), von Frey hair test (n = 5), and charcoal meal test (n = 5)...
February 17, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28211545/the-effect-of-gut-microbiome-on-tolerance-to-morphine-mediated-antinociception-in-mice
#3
Minho Kang, Ryan A Mischel, Sukhada Bhave, Essie Komla, Alvin Cho, Charity Huang, William L Dewey, Hamid I Akbarali
There is growing appreciation for the importance of gastrointestinal microbiota in many physiological and pathophysiological processes. While morphine and other narcotics are the most widely prescribed therapy for moderate to severe pain clinically, they have been noted to alter microbial composition and promote bacterial translocation to other tissues. Here we examined the pharmacodynamic properties of chronic morphine in mice following bacterial depletion with oral gavage of an antibiotic cocktail (ABX). ABX significantly reduced gut bacteria and prevented chronic morphine induced increases in gut permeability, colonic mucosal destruction, and colonic IL-1β expression...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28209101/role-of-heart-rate-variability-in-predicting-post-endoscopic-retrograde-cholangiopancreatography-pancreatitis
#4
Y Tryliskyy, G J Bryce
INTRODUCTION: Early recognition of post-ERCP pancreatitis (PEP) would help deliver an appropriate discharge plan following ERCP. Functioning of the autonomic nervous system can be measured using non-invasive heart rate variability techniques (HRV) and provides quantitative information about the modulation of cardiac vagal and sympathetic activity. Pain evoked sympathetic activation is a well-known phenomenon, as exhibited in those suffering PEP. The aim of this study is to determine if a single post-procedural measurement of HRV identifies those at risk of developing PEP...
September 2016: Acta Gastro-enterologica Belgica
https://www.readbyqxmd.com/read/28205574/neuropathic-pain
#5
REVIEW
Luana Colloca, Taylor Ludman, Didier Bouhassira, Ralf Baron, Anthony H Dickenson, David Yarnitsky, Roy Freeman, Andrea Truini, Nadine Attal, Nanna B Finnerup, Christopher Eccleston, Eija Kalso, David L Bennett, Robert H Dworkin, Srinivasa N Raja
Neuropathic pain is caused by a lesion or disease of the somatosensory system, including peripheral fibres (Aβ, Aδ and C fibres) and central neurons, and affects 7-10% of the general population. Multiple causes of neuropathic pain have been described and its incidence is likely to increase owing to the ageing global population, increased incidence of diabetes mellitus and improved survival from cancer after chemotherapy. Indeed, imbalances between excitatory and inhibitory somatosensory signalling, alterations in ion channels and variability in the way that pain messages are modulated in the central nervous system all have been implicated in neuropathic pain...
February 16, 2017: Nature Reviews. Disease Primers
https://www.readbyqxmd.com/read/28202366/modulation-of-the-trpv4-ion-channel-as-a-therapeutic-target-for-disease
#6
REVIEW
Megan S Grace, Sara J Bonvini, Maria G Belvisi, Peter McIntyre
Transient Receptor Potential Vanilloid 4 (TRPV4) is a broadly expressed, polymodally gated ion channel that plays an important role in many physiological and pathophysiological processes. TRPV4 knockout mice and several synthetic pharmacological compounds that selectively target TRPV4 are now available, which has allowed detailed investigation in to the therapeutic potential of this ion channel. Results from animal studies suggest that TRPV4 antagonism has therapeutic potential in oedema, pain, gastrointestinal disorders, and lung diseases such as cough, bronchoconstriction, pulmonary hypertension, and acute lung injury...
February 12, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28197544/plasticity-in-brainstem-mechanisms-of-pain-modulation-by-nicotinic-acetylcholine-receptors-in-the-rat
#7
Francis J Jareczek, Stephanie R White, Donna L Hammond
Individuals with chronic pain may be driven to smoke more because the analgesic efficacy of nicotine diminishes. To determine whether persistent pain diminishes the actions of a nicotinic acetylcholine receptor (nAChR) agonist in pain modulatory pathways, we examined the effects of epibatidine in the rostral ventromedial medulla (RVM) of rats with and without inflammatory injury induced by intraplantar injection of complete Freund's adjuvant (CFA). In uninjured rats, epibatidine produced a dose-dependent antinociception that was completely blocked by dihydro-β-erythroidine (DHβE; α4β2 antagonist) and partially blocked by methyllycaconitine (MLA; α7 antagonist)...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28197074/the-first-extracellular-linker-is-important-for-several-aspects-of-the-gating-mechanism-of-human-trpa1-channel
#8
Lenka Marsakova, Ivan Barvik, Vlastimil Zima, Lucie Zimova, Viktorie Vlachova
Transient receptor potential ankyrin 1 (TRPA1) is an excitatory ion channel involved in pain, inflammation and itching. This channel gates in response to many irritant and proalgesic agents, and can be modulated by calcium and depolarizing voltage. While the closed-state structure of TRPA1 has been recently resolved, also having its open state is essential for understanding how this channel works. Here we use molecular dynamics simulations combined with electrophysiological measurements and systematic mutagenesis to predict and explore the conformational changes coupled to the expansion of the presumptive channel's lower gate...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28196714/working-memory-load-modulates-the-neural-response-to-other-s-pain-evidence-from-an-erp-study
#9
Fang Cui, Xiangru Zhu, Yuejia Luo, Jiaping Cheng
The present study investigated the time course of processing other's pain under different conditions of working memory (WM) load. Event-related potentials (ERPs) were recorded while the participants held two digits (low WM load) or six digits (high WM load) in WM and viewed pictures that showed others who were in painful or non-painful situations. Robust WM-load × Picture interactions were found for the N2 and LPP components. In the high WM-load condition, painful pictures elicited significantly larger amplitudes than non-painful pictures...
February 11, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28196208/effect-of-radiotherapy-on-painful-bone-metastases-a-secondary-analysis-of-the-ncic-clinical-trials-group-symptom-control-trial-sc-23
#10
Rachel McDonald, Keyue Ding, Michael Brundage, Ralph M Meyer, Abdenour Nabid, Pierre Chabot, Genevieve Coulombe, Shahida Ahmed, Joda Kuk, A Rashid Dar, Aamer Mahmud, Alysa Fairchild, Carolyn F Wilson, Jackson S Y Wu, Kristopher Dennis, Carlo DeAngelis, Rebecca K S Wong, Liting Zhu, Stephanie Chan, Edward Chow
Importance: Many studies that found improved quality of life (QOL) after radiotherapy of bone metastases have small sample sizes and do not use specific questionnaires. How soon after radiotherapy one can expect an improvement in QOL is unknown. Objective: To investigate QOL at days 10 and 42 after radiotherapy with a bone metastases-specific QOL tool. Design, Setting, and Participants: In this secondary analysis of the NCIC Clinical Trials Group Symptom Control Trial SC...
February 9, 2017: JAMA Oncology
https://www.readbyqxmd.com/read/28195858/psychophysical-and-psychological-predictors-of-acute-pain-after-breast-surgery-differ-in-patients-with-and-without-pre-existing-chronic-pain
#11
Ruth Ruscheweyh, Anika Viehoff, Joke Tio, Esther M Pogatzki-Zahn
The prediction of acute postoperative pain would be of great clinical advantage but results of studies investigating possible predictors are inconsistent. Here, we studied the role of a wide variety of previously suggested predictors in 74 patients undergoing breast surgery. Preoperatively, patients filled out the Pain Sensitivity Questionnaire (PSQ) and a set of psychological questionnaires (the Beck Depression Inventory (BDI), State-Trait Anxiety Inventory (STAI), and Pain Catastrophizing Scale (PCS)) and participated in an experimental pain testing session, including assessment of conditioned pain modulation (CPM), temporal summation, and responses to heat, pinprick and pressure pain...
February 9, 2017: Pain
https://www.readbyqxmd.com/read/28195854/lateral-inhibition-during-nociceptive-processing
#12
Alexandre S Quevedo, Carsten Dahl Mørch, Ole K Andersen, Robert C Coghill
Spatial summation of pain is the increase of perceived intensity that occurs as the stimulated area increases. Spatial summation of pain is sub-additive in that increasing the stimulus area produces a disproportionately small increase in the perceived intensity of pain. A possible explanation for sub-additive summation may be that convergent excitatory information is modulated by lateral inhibition. To test the hypothesis that lateral inhibition may limit spatial summation of pain, we delivered different patterns of noxious thermal stimuli to the abdomens of 15 subjects using a computer-controlled CO2-laser...
February 11, 2017: Pain
https://www.readbyqxmd.com/read/28195170/quantifying-cerebral-contributions-to-pain-beyond-nociception
#13
Choong-Wan Woo, Liane Schmidt, Anjali Krishnan, Marieke Jepma, Mathieu Roy, Martin A Lindquist, Lauren Y Atlas, Tor D Wager
Cerebral processes contribute to pain beyond the level of nociceptive input and mediate psychological and behavioural influences. However, cerebral contributions beyond nociception are not yet well characterized, leading to a predominant focus on nociception when studying pain and developing interventions. Here we use functional magnetic resonance imaging combined with machine learning to develop a multivariate pattern signature-termed the stimulus intensity independent pain signature-1 (SIIPS1)-that predicts pain above and beyond nociceptive input in four training data sets (Studies 1-4, N=137)...
February 14, 2017: Nature Communications
https://www.readbyqxmd.com/read/28195064/catecholamines-reduce-transient-receptor-potential-vanilloid-type-1-desensitization-in-cultured-dorsal-root-ganglia-neurons
#14
A Filippi, C Caruntu, R O Gheorghe, A Deftu, B Amuzescu, V Ristoiu
Sympathetic nervous system and adrenergic receptors are involved in the modulation of dorsal root ganglia neuronal activity, with TRPV1 receptor as an important downstream effector. It is already known that adrenergic sensitization of TRPV1 receptors or catecholamine-induced TRPV1 upregulation are involved in increased excitability and pain via mainly α1 adrenergic receptors, but it is not known if reduced TRPV1 desensitization is involved in this process, as well. Therefore, the aims of this study were to evaluate the effects of epinephrine and norepinephrine on TRPV1 desensitization induced by repeated applications of capsaicin and to assess what would be the involvement of the major α1, α2 and β adrenergic receptor subtypes...
December 2016: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28194840/burst-spinal-cord-stimulation-increases-peripheral-antineuroinflammatory-interleukin-10-levels-in-failed-back-surgery-syndrome-patients-with-predominant-back-pain
#15
Thomas M Kinfe, Sajjad Muhammad, Carolina Link, Sandra Roeske, Shafqat R Chaudhry, Thomas L Yearwood
OBJECTIVES: Burst spinal cord stimulation (SCS) has been reported to reduce back pain and improve functional capacity in Failed Back Surgery Syndrome (FBSS). However, its mechanism of action is not completely understood. Systemic circulating cytokines have been associated with the development of chronic back pain. METHODS: This prospective, feasibility study enrolled 12 refractory FBSS patients with predominant back pain (70% of overall pain) suitable for Burst SCS...
February 13, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28192611/deficiency-of-trek-1-potassium-channel-exacerbates-secondary-injury-following-spinal-cord-injury-in-mice
#16
Yongkang Fang, Xiaojiang Huang, Yue Wan, Hao Tian, Yeye Tian, Wei Wang, Suiqiang Zhu, Minjie Xie
Spinal cord injury (SCI) involves complex pathological process which can be complicated by secondary injury. TREK-1 is a member of the two-pore domain potassium (K2P) channel family, which can be modulated by a number of physiological and pathological stimuli. Recent studies suggest that TREK-1 plays an active role in depression, pain and neuroprotection. However, its role in the pathological process after SCI remains unclear. In this study, we tested the expression and function of TREK-1 in spinal cord of mice after traumatic SCI...
February 13, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28191693/gene-expression-profiles-in-peripheral-blood-mononuclear-cells-correlate-with-salience-network-activity-in-chronic-visceral-pain-a-pilot-study
#17
A Gupta, S Cole, J S Labus, S Joshi, T J Nguyen, L A Kilpatrick, K Tillisch, B D Naliboff, L Chang, E A Mayer
BACKGROUND: Distinct gene expression profiles in peripheral blood mononuclear cells (PBMCs) consistent with increased sympathetic nervous system activity have been described in different populations under chronic stress. Neuroinflammatory brain changes, possibly related to the migration of primed monocytes to the brain, have been implicated in the pathophysiology of chronic pain. Irritable bowel syndrome (IBS) is a stress-sensitive gastrointestinal disorder associated with altered brain-gut interactions and increased sympathetic/vagal tone and anxiety...
February 12, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28191519/a-little-help-from-steroids-in-oncology
#18
Dominique Lossignol
Steroids are widely used in oncology and have been demonstrated to possess an anticancer effect or antiswelling effect. They are considered to improve refractory symptoms such as dyspnea or gastrointestinal (GI) obstruction. However, their roles in nonspecific indications are not well proved. Clinical practice and several studies suggest that corticosteroids may be effective in the treatment of bone and neuropathic pain, when administered along with opioids and with other adjuvant analgesics. The decrease in pain intensity is probably connected with both anti-inflammatory and antiswelling effects as well as modulation of neuroimmune interactions and an inhibition of angiogenesis...
April 1, 2016: Journal of Translational Internal Medicine
https://www.readbyqxmd.com/read/28187102/physical-activity-behavior-predicts-endogenous-pain-modulation-in-older-adults
#19
Kelly M Naugle, Thomas Ohlman, Keith E Naugle, Zachary A Riley, NiCole R Keith
Older adults compared with younger adults are characterized by greater endogenous pain facilitation and a reduced capacity to endogenously inhibit pain, potentially placing them at a greater risk for chronic pain. Previous research suggests that higher levels of self-reported physical activity are associated with more effective pain inhibition and less pain facilitation on quantitative sensory tests in healthy adults. However, no studies have directly tested the relationship between physical activity behavior and pain modulatory function in older adults...
March 2017: Pain
https://www.readbyqxmd.com/read/28186832/a-comprehensive-review-of-pulsed-radiofrequency-in-the-treatment-of-pain-associated-with-different-spinal-conditions
#20
Giancarlo Facchini, Paolo Spinnato, Giuseppe Guglielmi, Ugo Albisinni, Alberto Bazzocchi
OBJECTIVE: The objective of this review is to evaluate the efficacy of Pulsed Radiofrequency (PRF) treatment of pain associated with different spinal conditions. The mechanisms of action and biological effects are shortly discussed to provide the scientific basis for this radiofrequency modality. METHODS: We systematically searched for clinical studies on spinal clinical conditions using PRF. We searched the MEDLINE (PubMed) database. We classified the information in one table focusing on RCTs and other type of studies...
February 10, 2017: British Journal of Radiology
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