The inhibiting role of periaqueductal gray metabotropic glutamate receptor subtype 8 in a rat model of central neuropathic pain.

In this study, we tried to assess the modulatory effect of (S)-3,4-Dicarboxyphenylglycine (DCPG), a metabotropic glutamate receptor subtype 8 (mGluR8) agonist, in a model of chronic central neuropathic pain in male rats. We used a spinal cord contusion method (T6-T8) for the induction of chronic central neuropathic pain.Male Wistar rats were randomly assigned to 5 equal groups (n = 10 per group). Clips compression injury model was used to induce chronic central neuropathic pain. Three weeks after spinal cord injury DCPG, siRNA and normal saline were administered intra-ventrolaterally to the periaqueductal gray (PAG) region. Paw withdrawal response to acetone (cold allodynia) was assessed through acetone test. In addition, the effects of DCPG on rostral ventromedial medulla (RVM) off-cells activity were evaluated with immunohistochemistry. mGluR8 expressions were also measured.We found that treatment with DCPG increased pain threshold in acetone test. In addition, immunohistochemical evaluation of RVM off-cells showed that DCPG increased the suppressive function of these cells.The results revealed that activation of mGluR8 in PAG is capable to improve pain threshold via modulation of RVM off-cells activity.Abbreviations SCI: spinal cord injury; DCPG: (S)-3,4-dicarboxyphenylglycine; PAG: periaqueductal gray; siRNA: small interfering ribonucleic acid; RVM: rostral ventromedial medulla; mGluR: metabotropic glutamate receptor. PMID: 32245335 [PubMed - as supplied by ...
Source: Neurological Research - Category: Neurology Tags: Neurol Res Source Type: research

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Conclusions: The results revealed that activation of mGluR8 in PAG is not capable of improving the thermal hyperalgesia threshold. Based on the decreased expression of mGluR8 after SCI induced by clip compression injury and its significant increase after treatment of siRNA against mGluR8, this method might still hold promise as an effective treatment of neuropathic pain. It can be concluded that increased expression of mGluR8 is due to the fact that DCPG prevents the death of neurons that express these receptors. PMID: 32460469 [PubMed - as supplied by publisher]
Source: Asian Spine Journal - Category: Orthopaedics Tags: Asian Spine J Source Type: research
AbstractInjured somatosensory nervous system cause neuropathic pain which is quite difficult to treat using current approaches. It is therefore important to find new therapeutic options. We have analyzed cedrol effect on chronic constriction injury (CCI) induced neuropathic pain in rats. The mechanical and thermal hypersensitivity were evaluated using the von Frey filament, radiant heat and acetone drop methods. The changes in the levels of biomarkers of oxidative stress including malondialdehyde (MDA) and total thiol (SH), as well as inflammatory mediators including Tumour Necrosis Factor alpha (TNF- α) and Interleu...
Source: Metabolic Brain Disease - Category: Neurology Source Type: research
BACKGROUND: Changes in body representations (body image and/or body schema) have been reported in several chronic musculoskeletal pain syndromes, but rarely in patients with neuropathic pain and never in patients with spinal cord injury (SCI)-related pain....
Source: SafetyLit - Category: International Medicine & Public Health Tags: Economics of Injury and Safety, PTSD, Injury Outcomes Source Type: news
In conclusion, our results suggest a previously unknown mechanism whereby the canonical NF-κB cascade and a mitochondrial fission pathway interdependently regulate endothelial inflammation. Lin28 as a Target for Nerve Regeneration Researchers here show that the gene Lin28 regulates axon regrowth. In mice, raised levels of Lin28 produce greater regeneration of nerve injuries. Past research has investigated Lin28 from the standpoint of producing a more general improvement in regenerative capacity. It improves mitoch...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
Conclusions Changes in several measures of shoulder pain and function occurred after the home exercise program intervention, although the magnitude of changes was only significantly greater than those of the education-only control condition group for two measures. Significant changes in supraspinatus pathology were not detected with quantitative ultrasound metrics.
Source: American Journal of Physical Medicine and Rehabilitation - Category: Rehabilitation Tags: Original Research Articles Source Type: research
This article reviews selected treatment strategies for SCI-associated neuropathic pain.
Source: Physical Medicine and Rehabilitation Clinics of North America - Category: Rehabilitation Authors: Source Type: research
ConclusionThese results suggest an interplay between lower body scheme distorsions and pain in patients with spinal cord injury.
Source: European Journal of Pain - Category: Anesthesiology Authors: Tags: ORIGINAL ARTICLE Source Type: research
What does physical pain have to do with depression, and vice versa? On today’s Psych Central Podcast, our guest, Dr. Jack Stern, a board-certified neurosurgeon specializing in spinal surgery, explains the psychology of pain and how the two are inextricably linked. Dr. Stern describes how pain can lead to depression and how depression can intensify physical pain. We also find out why opioids don’t work for chronic pain, and how past pain affects current pain. Join us for an in-depth discussion on physical pain and mental health. SUBSCRIBE &REVIEW Guest information for ‘Dr. Jack Stern- Chronic Pain&r...
Source: World of Psychology - Category: Psychiatry & Psychology Authors: Tags: Chronic Pain Depression Disorders General Interview Mental Health and Wellness Podcast Psychology The Psych Central Show Source Type: blogs
Conditions:   Neuropathic Pain;   Spinal Cord Injury Intervention:   Other: Neurofeedback Sponsors:   Kessler Foundation;   University of Surrey Not yet recruiting
Source: - Category: Research Source Type: clinical trials
Abstract Neuropathic pain is a chronic condition which significantly reduces the quality of life and serious clinical issue that is in general resistant to available therapies. Therefore looking for new analgesics is still critical issue. Recent, studies have indicated that chemokine signaling pathways are crucial for the development of neuropathy; however, the role of CC chemokine receptor 4 (CCR4) in this process has not yet been studied. Therefore, the aim of our research was to investigate the influence of C021 (a CCR4 antagonist) and CCR4 CC chemokine ligands 17 and 22 (CCL17 and CCL22) on the development of ...
Source: European Journal of Pharmacology - Category: Drugs & Pharmacology Authors: Tags: Eur J Pharmacol Source Type: research
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