Evaluation of different drug classes on transient sciatic nerve injury–depressed marble burying in mice

A great need exists for the identification of new effective analgesics to treat sustained pain. However, most preclinical nociceptive assays measure behavioral responses evoked by noxious stimuli (ie, pain-stimulated behavior), which presents a challenge to distinguish between motor impairing and antinociceptive effects of drugs. Here, we demonstrate that chronic constriction injury (CCI) of the sciatic nerve elicits common pain-stimulated responses (ie, mechanical allodynia and thermal hyperalgesia) as well as reduces marble burying/digging behaviors that occur during the early stages of the neuropathy and resolve within 1 week. Although drugs representing distinct classes of analgesics (ie, morphine, valdecoxib, and gabapentin) reversed both CCI-induced and CCI-depressed nociceptive measures, diazepam lacked antinociceptive effects in all assays and the kappa-opioid receptor agonist U69593 reversed pain-stimulated, but not pain-depressed behaviors. In addition, we tested drugs targeting distinct components of the endocannabinoid system, including agonists at cannabinoid receptors type 1 (CB1) and type 2 (CB2), as well as inhibitors of the endocannabinoid-regulating enzymes fatty acid amide hydrolase and monoacylglycerol lipase. Each of these drugs reversed all CCI-induced nociceptive measures, with the exception of the fatty acid amide hydrolase inhibitor that reversed pain-stimulated behaviors, only. These findings support the use of the mouse marble-burying assay as a mod...
Source: Pain - Category: Anesthesiology Tags: Research Paper Source Type: research

Related Links:

Abstract BACKGROUND: Migraine is a diffuse and disabling disease. Its pathophysiology is complex and involves both central and peripheral dysfunctions. OBJECTIVE: This review will discuss the pathogenesis of migraine from the origin of the neuro-inflammatory theory, to the modern pathophysiological model and the latest therapies. METHODS: PUBMED and EMBASE (up to May 2019) were searched for: migraine, inflammation, immunomodulation. An additional search was carried out from the bibliography of previous review articles. RESULTS: Migraine was thought to be mainly a vascular disorder, according to the ...
Source: Current Pharmaceutical Design - Category: Drugs & Pharmacology Authors: Tags: Curr Pharm Des Source Type: research
Rebound headaches, also known as medication overuse headaches, are caused by the frequent or excessive use of pain-relieving and/or antimigraine drugs to treat headache attacks that are already in progress. (Note that these are not the same as oral prophylactic or preventive medicines, which should be taken daily.) In other words, the same medications that initially relieve headache pain can themselves trigger subsequent headaches if they are used too often. Medication overuse headaches can be disabling, forcing people with this condition to take sick leave and to be less productive at work and home. To be diagnosed with m...
Source: Harvard Health Blog - Category: Consumer Health News Authors: Tags: Drugs and Supplements Headache Health Source Type: blogs
Abstract For persons living with chronic conditions, health-related quality of life (HRQoL) symptoms, such as pain, anxiety, depression, and insomnia, often interact and mutually reinforce one another. There is evidence that medical cannabis (MC) may be efficacious in ameliorating such symptoms and improving HRQoL. As many of these HRQoL symptoms may mutually reinforce one another, we conducted an exploratory study to investigate how MC users perceive the efficacy of MC in addressing co-occurring HRQoL symptoms. We conducted a cross-sectional online survey of persons with a state medical marijuana card in Illinois...
Source: Behavioral Medicine - Category: Psychiatry Authors: Tags: Behav Med Source Type: research
i Y Abstract Patients with fibromyalgia (FM) report high levels of sleep disturbance and chronic diffuse musculoskeletal pain. These patients experience diminished quality of life (QoL) due to pain and other comorbidities. Chronotype preferences have been suggested as a potential factor connecting increased severity of FM, sleep disturbances, and poor overall QoL. The present study is the first study examining the possible association between chronotype preferences, sleep disturbance, severity of FM, and QoL in patients with FM.One hundred drug-free patients diagnosed with FM participated in this cross-sectional s...
Source: Chronobiology International - Category: Biology Authors: Tags: Chronobiol Int Source Type: research
by Yu-Jung Jenny Wei, Cheng Chen, Roger Fillingim, Siegfried O. Schmidt, Almut G. Winterstein BackgroundWith governments ’ increasing efforts to curb opioid prescription use and limit dose below the Centers for Disease Control and Prevention (CDC)-recommended threshold of 90 morphine milligram equivalents per day, little is known about prescription opioid patterns preceding opioid use disorder (OUD) or overdose. Thi s study aimed to determine prescribed opioid fills and dose trajectories in the year before an incident OUD or overdose diagnosis using a 2005–2016 commercial healthcare database. Methods and findin...
Source: PLoS Medicine - Category: Internal Medicine Authors: Source Type: research
The objective of this cross sectional study was to assess knowledge and attitudes in medical students regarding burn complications. A 12-question survey was distributed among 3rd, 4th and 5th year students of public sector medical colleges of Karachi, Pakistan. Out of 353 respondents, the proportion of students that were aware of burn complications was the following, with an expected response of 100% for each complication: depression [86%], fear [53.3%], post-traumatic stress disorder [40.8%], suicidal tendencies [35.1%], sleep disorder [30%], anxiety [27%], guilt [12.7%], personality changes [7%], eating disorder [5.4%], ...
Source: Burns - Category: Dermatology Source Type: research
Abstract Patients with chronic pain and especially with craniomandibular disorder (CMD) show specific psychopathology in trait anxiety. In a previous longitudinal functional imaging study on CMD we found that the anterior insula was modulated by successful therapy intervention and pain relief. We here intended to investigate possible associations between anterior insula fMRI-activation during occlusal movements and trait anxiety over a splint therapy approach in patients with CMD. Three fMRI-investigations of a craniomandibular occlusion task were performed together with pain score evaluations and scoring of trait...
Source: Behavioural Brain Research - Category: Neurology Authors: Tags: Behav Brain Res Source Type: research
The objective of this study was to explore the effect of social support on depression in chronic stroke patients and the relationship between demographic and disease characteristics. Total samples were randomly divided into an intervention group (n = 31) and a control group (n = 31). Sixteen social support interventions were performed over 8 weeks. Social support programs were implemented 2 times a week. Depressive symptoms were assessed at the second week, 4th week, 8th week, and 4 weeks after the end of the study using the 10-item Center for the Epidemiological Studies of Depression Short Form (CES-D10). There wa...
Source: Medicine - Category: Internal Medicine Tags: Research Article: Observational Study Source Type: research
Abstract According to the U.S. Census Bureau, 18.2 million veterans were living in the United States in 2017, of whom 1.6 million were female. Less than one-half of all veterans receive care at a Veterans Health Administration or military treatment facility, leaving most to receive services from primary care physicians. Injuries and illnesses common among this patient population include musculoskeletal injuries and chronic pain, mental health issues such as posttraumatic stress disorder (PTSD) and moral injury, traumatic brain injury, chemical and noise exposures, and infectious disease concerns. Family physicians...
Source: American Family Physician - Category: Primary Care Authors: Tags: Am Fam Physician Source Type: research
CONCLUSION: This study demonstrated that the treatments were effective in both groups. However, the efficacy of the osteopathic manipulation treatment was greater than that of the therapeutic exercises. PMID: 31658037 [PubMed - as supplied by publisher]
Source: Journal of Back and Musculoskeletal Rehabilitation - Category: Orthopaedics Tags: J Back Musculoskelet Rehabil Source Type: research
More News: Anesthesiology | Brain | Chronic Pain | Depression | Diazepam | Gabapentin | Morphine | Neurology | Neurontin | Pain | Valium