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https://www.readbyqxmd.com/read/28306606/spinal-microglial-p2x4-receptor-brain-derived-neurotrophic-factor-signaling-regulates-nicotine-withdrawal-induced-hyperalgesia
#1
Xiaodi Zhang, Pengcheng Xu, Chengbao Li, Wenchao Zhu, Shanshan Wu, Ailan Yu, Yonghong Ding, Qinghe Wang, Zongwang Zhang
Nicotine withdrawal (NTW) has been shown to increase pain sensitivity. However, the pathogenesis of NTW-induced hyperalgesia syndrome is unknown. Microglial activation, with increased expression of the P2X4 receptor (P2X4R) and brain-derived neurotrophic factor (BDNF) as important markers, is associated with hyperalgesia; therefore, these markers may represent an unprecedented target to prevent hyperalgesia. In this study, we explored the contributions of spinal microglial P2X4R-BDNF signaling in NTW-induced hyperalgesia...
March 16, 2017: Neuroreport
https://www.readbyqxmd.com/read/28302538/protective-effects-of-garcinol-against-neuropathic-pain-evidence-from-in-vivo-and-in-vitro-studies
#2
Yi-Wei Wang, Xiang Zhang, Chun-Long Chen, Qing-Zhen Liu, Jia-Wen Xu, Qing-Qing Qian, Wei-Yan Li, Yan-Ning Qian
Neuroinflammatory processes have a vital role in the pathogenesis of neuropathic pain. Garcinol, harvested from Garcinia indica, is known to exert potent anti-inflammatory properties. Recent studies have indicated that Garcinol may inhibit activation of nuclear factor-κB (NF-κB) by inhibiting NF-κB/p65 acetylation. These findings prompted us to evaluate the protective effects of Garcinol in the lumbar fifth spinal nerve ligation (SNL)-induced rat model of neuropathic pain and Lipopolysaccharide(LPS)-stimulated primary cultured microglia...
March 13, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28300618/the-novel-and-potent-anti-depressive-action-of-triptolide-and-its-influences-on-hippocampal-neuroinflammation-in-a-rat-model-of-depression-comorbidity-of-chronic-pain
#3
Xiaofan Hu, Yulin Dong, Xiaohang Jin, Chunkui Zhang, Ting Zhang, Jie Zhao, Juan Shi, Jinlian Li
Chronic pain and depression frequently coexist in clinical setting, and current clinical treatments for this comorbidity have shown limited efficacy. Triptolide (T10), an active component of Tripterygium wilfordii Hook F., has been demonstrated to exert strong analgesic activities in experimental pain models, but whether it possesses anti-depressive actions remains unknown. Using a depression comorbidity of chronic pain rat model induced by spinal nerve ligation (SNL), we investigated the potency of T10 for the treatment of comorbid depression in comparison with a widely used antidepressant, fluoxetine (FLX)...
March 11, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28286285/minocycline-reduces-mechanical-allodynia-and-depressive-like-behaviour-in-type-1-diabetes-mellitus-in-the-rat
#4
Diana Amorim, Sónia Puga, Rui Bragança, António Braga, Antti Pertovaara, Armando Almeida, Filipa Pinto-Ribeiro
A common and devastating complication of diabetes mellitus is painful diabetic neuropathy (PDN) that can be accompanied by emotional disorders such as depression. A few studies have suggested that minocycline that inhibits microglia may attenuate pain hypersensitivity in PDN. Moreover, a recent study reported that minocycline has an acute antidepressive-like effect in diabetic animals. Here we studied whether (i) prolonged minocycline treatment suppresses pain behaviour in PDN, (ii) the minocycline effect varies with submodality of pain, and (iii) the suppression of pain behaviour by prolonged minocycline treatment is associated with antidepressive-like effect...
March 7, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28275350/blockade-of-p2x4-receptors-inhibits-neuropathic-pain-related-behavior-by-preventing-mmp-9-activation-and-consequently-pronociceptive-interleukin-release-in-a-rat-model
#5
Agnieszka M Jurga, Anna Piotrowska, Wioletta Makuch, Barbara Przewlocka, Joanna Mika
Neuropathic pain is still an extremely important problem in today's medicine because opioids, which are commonly used to reduce pain, have limited efficacy in this type of pathology. Therefore, complementary therapy is needed. Our experiments were performed in rats to evaluate the contribution of the purinergic system, especially P2X4 receptor (P2X4R), in the modulation of glia activation and, consequently, the levels of nociceptive interleukins after chronic constriction injury (CCI) of the right sciatic nerve, a rat model of neuropathic pain...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28270702/unconventional-role-of-caspase-6-in-spinal-microglia-activation-and-chronic-pain
#6
REVIEW
Temugin Berta, Jee Eun Lee, Chul-Kyu Park
Chronic pain affects ~20% of the worldwide population. The clinical management of chronic pain is mostly palliative and results in limited success. Current treatments mostly target the symptoms or neuronal signaling of chronic pain. It has been increasingly recognized that glial cells, such as microglia, and inflammatory signaling play a major role in the pathogenesis of chronic pain. Caspases (CASPs) are a family of protease enzymes involved in apoptosis and inflammation. They are pivotal components in a variety of neurological diseases...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28270575/truncated-trkb-t1-mediated-astrocyte-dysfunction-contributes-to-impaired-motor-function-and-neuropathic-pain-after-spinal-cord-injury
#7
Jessica J Matyas, Cliona M O'Driscoll, Laina Yu, Marina Coll-Miro, Sean Daugherty, Cynthia L Renn, Alan I Faden, Susan G Dorsey, Junfang Wu
Following spinal cord injury (SCI), astrocytes demonstrate long-lasting reactive changes, which are associated with the persistence of neuropathic pain and motor dysfunction. We previously demonstrated that up-regulation of trkB.T1, a truncated isoform of the Brain-derived Neurotrophic Factor (BDNF) receptor, contributes to gliosis after SCI, but little is known about the effects of TrkB.T1 on the function of astrocytes. As trkB.T1 is the sole isoform of trkB receptors expressed on astrocytes, we examined the function of trkB...
March 7, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28270169/molecules-in-pain-and-sex-a-developing-story
#8
REVIEW
Josiane C S Mapplebeck, Simon Beggs, Michael W Salter
Microglia are dynamic immune cells with diverse roles in maintaining homeostasis of the central nervous system. Dysregulation of microglia has been critically implicated in the genesis of neuropathic pain. Peripheral nerve injury, a common cause of neuropathic pain, engages microglia-neuronal signalling which causes disinhibition and facilitated excitation of spinal nociceptive pathways. However, recent literature indicates that the role of microglia in neuropathic pain is sexually dimorphic, and that female pain processing appears to be independent of microglia, depending rather on T cells...
March 7, 2017: Molecular Brain
https://www.readbyqxmd.com/read/28257897/ezh2-regulates-spinal-neuroinflammation-in-rats-with-neuropathic-pain
#9
Ruchi Yadav, Han-Rong Weng
Alteration in gene expression along the pain signaling pathway is a key mechanism contributing to the genesis of neuropathic pain. Accumulating studies have shown that epigenetic regulation plays a crucial role in nociceptive process in the spinal dorsal horn. In this present study, we investigated the role of enhancer of zeste homolog-2 (EZH2), a subunit of the polycomb repressive complex 2, in the spinal dorsal horn in the genesis of neuropathic pain in rats induced by partial sciatic nerve ligation. EZH2 is a histone methyltransferase, which catalyzes the methylation of histone H3 on K27 (H3K27), resulting in gene silencing...
February 28, 2017: Neuroscience
https://www.readbyqxmd.com/read/28254586/infant-nerve-injury-induces-delayed-microglial-polarization-to-the-m1-phenotype-and-exercise-reduces-delayed-neuropathic-pain-by-modulating-microglial-activity
#10
Xingrui Gong, Yongmei Chen, Bao Fu, Jing Jiang, Mazhong Zhang
Neuropathic pain is absent in infants and emergent years after injury. Adult spinal cord microglia play a key role in initiating neuropathic pain, and modulation of microglia is a potential target for treating neuropathic pain. In this study, we evaluated the role of microglia after infant peripheral nerve injury and the effect of exercise on the delayed-onset neuropathic pain. Rat pups received spared nerve injury, and behavior tests were performed to evaluate their pain threshold. qPCR, immunohistochemistry, and Western blot were used for M1 and M2 marker expression analysis...
February 28, 2017: Neuroscience
https://www.readbyqxmd.com/read/28251660/neuronal-and-microglial-mechanisms-for-neuropathic-pain-in-the-spinal-dorsal-horn-and-anterior-cingulate-cortex
#11
REVIEW
Makoto Tsuda, Kohei Koga, Tao Chen, Min Zhuo
Neuropathic pain is a debilitating chronic pain condition occurring after damage in the nervous system and is refractory to the currently available treatments. Major challenges include elucidating its mechanisms and developing new medications to treat it. Nerve injury-induced pain hypersensitivity involves aberrant excitability in spinal dorsal horn (SDH) neurons as a consequence of dysfunction of inhibitory interneurons and of hyperactivity of glial cells, especially microglia, the immune cells of the central nervous system...
March 2, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28243146/p2y12-receptor-mediated-activation-of-spinal-microglia-and-p38mapk-pathway-contribute-to-cancer-induced-bone-pain
#12
Mingjuan Liu, Ming Yao, Hanqi Wang, Longsheng Xu, Ying Zheng, Bing Huang, Huadong Ni, Shijie Xu, Xuyan Zhou, Qingquan Lian
BACKGROUND: Cancer-induced bone pain (CIBP) is one of the most challenging clinical problems due to a lack of understanding the mechanisms. Recent evidence has demonstrated that activation of microglial G-protein-coupled P2Y12 receptor (P2Y12R) and proinflammatory cytokine production play an important role in neuropathic pain generation and maintenance. However, whether P2Y12R is involved in CIBP remains unknown. METHODS: The purpose of this study was to investigate the role of P2Y12R in CIBP and its molecular mechanisms...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28219988/sex-differences-in-microglia-activity-within-the-periaqueductal-gray-of-the-rat-a-potential-mechanism-driving-the-dimorphic-effects-of-morphine
#13
H H Doyle, L N Eidson, D M Sinkiewicz, A Z Murphy
Although morphine remains the primary drug prescribed for alleviation of severe or persistent pain, both preclinical and clinical studies have shown that females require 2-3 times more morphine than males to produce comparable levels of analgesia. In addition to binding to the neuronal μ opioid receptor (MOR), morphine binds to the innate immune receptor toll-like receptor 4 (TLR4) localized primarily on microglia. Morphine action at TLR4 initiates a neuroinflammatory response that directly opposes the analgesic effects of morphine...
February 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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
#14
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/28195183/interleukin-1%C3%AE-pre-treated-bone-marrow-stromal-cells-alleviate-neuropathic-pain-through-ccl7-mediated-inhibition-of-microglial-activation-in-the-spinal-cord
#15
Jian Li, Guoying Deng, Haowei Wang, Mei Yang, Rui Yang, Xiangnan Li, Xiaoping Zhang, Hongbin Yuan
Although neuropathic pain is one of the most intractable diseases, recent studies indicate that systemic or local injection of bone marrow stromal cells (BMSCs) decreases pro-inflammatory cytokines release and alleviates neuropathic pain. However, it is still not clear whether pre-treated BMSCs have a strong anti-inflammatory and/or analgesia effect. Using the spinal nerve ligation model of neuropathic pain, IL-1β pre-treated BMSCs (IL-1β-BMSCs) were injected into rats followed by SNL in order to determine possible effects...
February 14, 2017: Scientific Reports
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/28192096/gabapentin-decreases-microglial-cells-and-reverses-bilateral-hyperalgesia-and-allodynia-in-rats-with-chronic-myositis
#17
A S Rosa, M F Freitas, I R C Rocha, M Chacur
In the present work, we investigated the antinociceptive effect of gabapentin in a chronic myositis model and its interference in spinal glial cells. Chronic myositis was induced by injection of Complete Freund Adjuvant (CFA) into the right gastrocnemius (GS) muscle of rats and tests for evaluating mechanical hyperalgesia, thermal hyperalgesia and tactile allodynia were performed. Pharmacological treatment with gabapentin was administrated intrathecally and 100μg and 200μg doses were tested. For analyzing astrocytes and microglia in the spinal cord, immunochemistry assay was performed...
February 10, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28186109/astragali-radix-could-it-be-an-adjuvant-for-oxaliplatin-induced-neuropathy
#18
Lorenzo Di Cesare Mannelli, Alessandra Pacini, Laura Micheli, Angelo Pietro Femia, Mario Maresca, Matteo Zanardelli, Alfredo Vannacci, Eugenia Gallo, Anna Rita Bilia, Giovanna Caderni, Fabio Firenzuoli, Alessandro Mugelli, Carla Ghelardini
Neurotoxicity is a major side effect of platinum derivatives both during and after treatment. In the absence of effective pharmacological compounds, the opportunity to identify safe adjuvant treatments among medicinal plants seems appropriate. Astragali radix is an adaptogenic herbal product recently analyzed in platinum-treated cancer patients. With the aim of evaluating the anti-neuropathic profile of Astragali radix, a previously characterized aqueous (Aqu) and two hydroalcoholic (20%HA and 50%HA) extracts were tested in a rat model of oxaliplatin-induced neuropathy...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28181986/local-administration-of-thiamine-ameliorates-ongoing-pain-in-a-rat-model-of-second-degree-burn
#19
Kangkang Zhang, Yali Pei, Zhihao Gan, Xuetao Zhang, Ye Duan, Yuepeng Liu, Wei Liu
The objective of this study was to develop rat model of second-degree burn pain and test analgesic efficacy of local thiamine administration. Automatic temperature-controlled hot plate was set at 85 ± 0.1°C with a filter paper on the top. Rats were thrust on hot plate landing on plantar surface for 4 to 7 and 10 seconds, respectively. Burnt skin was observed. Hematoxylin and eosin staining and Masson staining were used to monitor burn degree. Gait analysis detected change of locomotion. Allodynia and hyperalgesia in the burnt area were evaluated with von Frey test and Hargreaves Test, and ongoing pain was detected with conditional place preference test...
February 7, 2017: Journal of Burn Care & Research: Official Publication of the American Burn Association
https://www.readbyqxmd.com/read/28176234/frequent-mild-head-injury-promotes-trigeminal-sensitivity-concomitant-with-microglial-proliferation-astrocytosis-and-increased-neuropeptide-levels-in-the-trigeminal-pain-system
#20
Ashley L Tyburski, Lan Cheng, Soroush Assari, Kurosh Darvish, Melanie B Elliott
BACKGROUND: Frequent mild head injuries or concussion along with the presence of headache may contribute to the persistence of concussion symptoms. METHODS: In this study, the acute effects of recovery between mild head injuries and the frequency of injuries on a headache behavior, trigeminal allodynia, was assessed using von Frey testing up to one week after injury, while histopathological changes in the trigeminal pain pathway were evaluated using western blot, ELISA and immunohistochemistry...
December 2017: Journal of Headache and Pain
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