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Nociceptive pain

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https://www.readbyqxmd.com/read/29058253/why-we-still-need-to-speak-about-sex-differences-and-sex-hormones-in-pain
#1
EDITORIAL
Anna Maria Aloisi
In the world of pain, we must always consider the presence of gender. In nociception, as well as in pain, women are different from men in many, if not all, aspects of the system. Nociception is the sum of several events that occur from the periphery to the CNS, and there is much evidence that female nociception differs from male nociception. Moreover, it has to be considered that pain results from a male or a female cortex. Genetic, anatomical, physiological, hormonal, psychological, and social factors have been considered to explain the differences present at both levels...
October 20, 2017: Pain and Therapy
https://www.readbyqxmd.com/read/29057787/vitamin-d-in-pain-management
#2
REVIEW
Maria Helde-Frankling, Linda Björkhem-Bergman
Vitamin D is a hormone synthesized in the skin in the presence of sunlight. Like other hormones, vitamin D plays a role in a wide range of processes in the body. Here we review the possible role of vitamin D in nociceptive and inflammatory pain. In observational studies, low vitamin D levels have been associated with increased pain and higher opioid doses. Recent interventional studies have shown promising effects of vitamin D supplementation on cancer pain and muscular pain-but only in patients with insufficient levels of vitamin D when starting intervention...
October 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29055283/reactive-oxygen-species-scavengers-ameliorate-mechanical-allodynia-in-a-rat-model-of-cancer-induced-bone-pain
#3
Ya-Qun Zhou, Dai-Qiang Liu, Shu-Ping Chen, Jia Sun, Xue-Rong Zhou, Heike Rittner, Wei Mei, Yu-Ke Tian, Hui-Xian Zhang, Fei Chen, Da-Wei Ye
Cancer-induced bone pain (CIBP) is a frequent complication in patients suffering from bone metastases. Previous studies have demonstrated a pivotal role of reactive oxygen species (ROS) in inflammatory and neuropathic pain, and ROS scavengers exhibited potent antinociceptive effect. However, the role of spinal ROS remains unclear. In this study, we investigated the analgesic effect of two ROS scavengers in a well-established CIBP model. Our results found that intraperitoneal injection of N-tert-Butyl-α-phenylnitrone (PBN, 50 and 100mg/kg) and 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (Tempol, 100 and 200mg/kg) significantly suppressed the established mechanical allodynia in CIBP rats...
October 16, 2017: Redox Biology
https://www.readbyqxmd.com/read/29055075/association-between-genetic-polymorphisms-and-pain-sensitivity-in-patients-with-hip-osteoarthritis
#4
Anne E Olesen, Lecia M Nielsen, Søren Feddersen, Joachim Erlenwein, Frank Petzke, Michael Przemeck, Lona L Christrup, Asbjørn M Drewes
BACKGROUND: Factors such as age, gender and genetic polymorphisms may explain individual difference in pain phenotype. Genetic associations to pain sensitivity have previously been investigated in osteoarthritis patients with focus on the P2X7, TRPV1 and TACR1 genes. However, other genes may play a role as well. Osteoarthritis is a common joint disease and many patients suffering from this disease are thought to have increased sensitivity to noxious stimuli resulting from sensitization in the nociceptive system...
October 20, 2017: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/29054488/the-histone-demethylase-jmjd2a-regulates-the-expression-of-bdnf-and-mediates-neuropathic-pain-in-mice
#5
Junfei Zhou, Fang Wang, Chang Xu, Zipeng Zhou, Wei Zhang
JMJD2A is a JmjC histone demethylase that catalyzes the demethylation of di- and trimethylated Lys9 and Lys36 in histone H3 (H3K9me2/3 and H3K36me2/3). The role of spinal JMJD2A-dependent histone demethylation in nociception hypersensitivity development remains elusive. Here we reported that the JMJD2A responded to neuropathic pain and participated in the maintenance of neuropathic pain. The mRNA and protein levels of Jmjd2a were significantly increased in the neurons of mouse undergoing neuropathic pain induced by sciatic nerve chronic constrictive injury (CCI) or unilateral spared nerve injury (SNI)...
October 17, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/29051582/a-role-for-the-purinergic-receptor-p2x3-in-astrocytes-in-the-mechanism-of-craniofacial-neuropathic-pain
#6
Won Mah, Sang Man Lee, Jaekwang Lee, Jin Young Bae, Jin Sook Ju, C Justin Lee, Dong Kuk Ahn, Yong Chul Bae
The purinergic receptor P2X3, expressed in the central terminals of primary nociceptive neurons in the brainstem, plays an important role in pathological pain. However, little is known about expression of P2X3 in the brainstem astrocytes and its involvement in craniofacial pathologic pain. To address this issue, we investigated the expression of P2X3 in astrocytes in the trigeminal caudal nucleus (Vc) in a rat model of craniofacial neuropathic pain, chronic constriction injury of infraorbital nerve (CCI-ION)...
October 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29051514/evidence-for-long-term-sensitization-of-the-bowel-in-patients-with-post-infectious-ibs
#7
D Balemans, S U Mondelaers, V Cibert-Goton, N Stakenborg, J Aguilera-Lizarraga, J Dooley, A Liston, D C Bulmer, P Vanden Berghe, G E Boeckxstaens, M M Wouters
Post-infectious irritable bowel syndrome (PI-IBS) is a common gastrointestinal disorder characterized by persistent abdominal pain despite recovery from acute gastroenteritis. The underlying mechanisms are unclear, although long-term changes in neuronal function, and low grade inflammation of the bowel have been hypothesized. We investigated the presence and mechanism of neuronal sensitization in a unique cohort of individuals who developed PI-IBS following exposure to contaminated drinking water 7 years ago...
October 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29046638/blockade-of-cannabinoid-cb1-receptors-in-the-dorsal-periaqueductal-gray-unmasks-the-antinociceptive-effect-of-local-injections-of-anandamide-in-mice
#8
Diego C Mascarenhas, Karina S Gomes, Tatiani Sorregotti, Ricardo L Nunes-de-Souza
Divergent results in pain management account for the growing number of studies aiming at elucidating the pharmacology of the endocannabinoid/endovanilloid anandamide (AEA) within several pain-related brain structures. For instance, the stimulation of both Transient Receptor Potential Vanilloid type 1 (TRPV1) and Cannabinoid type 1 (CB1) receptors led to paradoxical effects on nociception. Here, we attempted to propose a clear and reproducible methodology to achieve the antinociceptive effect of exogenous AEA within the dorsal periaqueductal gray (dPAG) of mice exposed to the tail-flick test...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29044685/involvement-of-nf-%C3%AE%C2%BAb-in-the-upregulation-of-cystathionine-%C3%AE-lyase-a-hydrogen-sulfide-forming-enzyme-and-bladder-pain-accompanying-cystitis-in-mice
#9
Tomoka Ozaki, Maho Tsubota, Fumiko Sekiguchi, Atsufumi Kawabata
Hydrogen sulfide (H2 S) is generated from L-cysteine by multiple enzymes including cystathionine-γ-lyase (CSE), and promotes nociception by targeting multiple molecules such as Cav 3.2 T-type Ca(2+) channels. Bladder pain accompanying cyclophosphamide (CPA)-induced cystitis in mice has been shown to involve the functional upregulation of the CSE/H2 S/Cav 3.2 pathway. Therefore, we investigated whether NF-κB, as an upstream signal of the CSE/H2 S system, contributes to bladder pain in mice with CPA-induced cystitis...
October 17, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/29042815/the-role-of-mir-190a-5p-contributes-to-diabetic-neuropathic-pain-via-targeting-slc17a6
#10
Di Yang, Qinyan Yang, Xinchuan Wei, Yang Liu, Ding Ma, Jiaceng Li, Yongling Wan, Yao Luo
INTRODUCTION: MicroRNAs play a key role in neuropathic pain. In a previous study, miR-190a-5p was significantly downregulated in diabetic neuropathic pain (DNP). However, the role and pathological mechanism of miR-190a-5p in DNP still remain unclear. MATERIALS AND METHODS: DNP model was established. The paw withdrawal thresholds were measured to assess the mechanical nociceptive response. Dual-luciferase reporter assay was used to confirm the target gene of microRNA...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/29042813/rehabilitation-management-of-low-back-pain-it-s-time-to-pull-it-all-together
#11
Yannick Tousignant-Laflamme, Marc Olivier Martel, Anand B Joshi, Chad E Cook
In the past, rehabilitation research initiatives for low back pain (LBP) have targeted outcome enhancement through personalized treatment approaches, namely through classification systems (CS). Although the use of CS has enhanced outcomes, common management practices have not changed, the prevalence of LBP is still high, and only selected patients meet the CS profile, namely those with a nociceptive context. Similarly, although practice guidelines propose some level of organization and occasionally a timeline of care provision, each mainly provides best practice for isolated treatment approaches...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/29042208/antiallodynic-activity-of-leflunomide-is-partially-inhibited-by-naltrexone-and-glibenclamide-and-associated-with-reduced-production-of-tnf-%C3%AE-and-cxcl-1
#12
Ana Mercy S Brito, Adriana M Godin, Paulo Sérgio A Augusto, Raquel R Menezes, Ivo S F Melo, Marcela G M B Dutra, Sarah O A M Costa, Franciele A Goulart, Felipe F Rodrigues, Isis MoraisMarcela Ísis Morais, Renes R Machado, Márcio M Coelho
Leflunomide, an immunosuppressive drug approved for the treatment of patients with rheumatoid arthritis, exhibits many mechanisms which may affect the nociceptive processing. Therefore, the present study aimed to evaluate the effect induced by leflunomide on the mechanical allodynia in models of inflammatory and neuropathic pain in mice and investigate mechanisms mediating such effects. Per os (p.o.) administration of leflunomide (25, 50 or 100 mg/kg) inhibited the inflammatory edema and mechanical allodynia induced by intraplantar carrageenan...
October 14, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29037948/discovery-of-aminocyclohexene-analogues-as-selective-and-orally-bioavailable-hnav1-7-inhibitors-for-analgesia
#13
Mingxing Teng, Wentao Wu, Zhixiang Li, Guangwen Yang, Jian Qin, Yikai Wang, Zhijing Hu, Haiheng Dong, Lijuan Hou, Guoping Hu, Liang Shen, Yang Zhang, Jian Li, Shuhui Chen, Jingwei Tian, Liang Ye, Jianzhao Zhang, Hongbo Wang
hNav1.7 receives a lot of attention owing to its attractive mechanism of action in pain processing pathway. We have previously reported our design of a novel series of tetrahydropyridine analogues towards hNav1.7 selective inhibitors. Herein, we disclose further efforts to the optimization of hit compound (-)-6, which led to the identification of aminocyclohexene analogues (-)-9 and (-)-17 with good potency, high selectivity, and minimal CYP inhibition. Both compounds (-)-9 and (-)-17 demonstrated improved pharmacokinetic profiles in rats, and robust efficacy in rat formalin-induced nociception and spinal nerve ligation (SNL) models...
October 7, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29037798/electroencephalographic-assessment-of-oral-meloxicam-topical-anaesthetic-cream-and-cautery-iron-for-mitigating-acute-pain-in-pigs-sus-scrofa-undergoing-tail-docking
#14
Nikki J Kells, N J Beausoleil, M A Sutherland, R M Morrison, Craig B Johnson
OBJECTIVE: To evaluate the efficacy of oral meloxicam, topical anaesthetic cream and cautery iron in mitigating acute nociceptive responses of pigs to tail docking. STUDY DESIGN: A prospective, randomized, controlled experimental study. ANIMALS: A total of 40 healthy Large WhitexLandrace pigs aged 21±1 days, weighing 6.1±0.9 kg. METHODS: Pigs were randomly assigned to one of four treatments (n=10 per treatment): CONTROL: docked using clippers without analgesia; MEL: docked using clippers after administration of oral meloxicam; EMLA: docked using clippers after application of topical anaesthetic cream; and CAUT: docked using a cautery iron without analgesia...
February 24, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/29037652/the-local-twitch-response-during-trigger-point-dry-needling-is-it-necessary-for-successful-outcomes
#15
Thomas Perreault, James Dunning, Raymond Butts
BACKGROUND: Myofascial trigger point (MTrP) injection and trigger point dry needling (TrPDN) are widely accepted therapies for myofascial pain syndrome (MPS). Empirical evidence suggests eliciting a local twitch response (LTR) during needling is essential. OBJECTIVE: This is the first review exploring the available literature, regardless of study design, on the neurophysiological effects and clinical significance of the LTR as it relates to reductions in pain and disability secondary to MTrP needling...
October 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29037537/validation-of-two-chinese-version-pain-observation-tools-in-conscious-and-unconscious-critically-ill-patients
#16
Li-Hua Cheng, Yun-Fang Tsai, Cheng-Hsu Wang, Pei-Kwei Tsay
OBJECTIVES: To compare the construct validities of the Chinese-versions Critical-Care Pain Observation Tool and Behavioural Pain Scale as measures of critically ill patients' pain by (a) discriminant validation of behavioural scales and vital signs (e.g. heart rate and mean arterial pressure) during a non-nociceptive procedure (noninvasive blood pressure] assessment) and a nociceptive procedure (endotracheal suctioning), (b) criterion validation of behavioural scales and vital signs with patients' self-reported pain and (c) testing the interrater reliability of both scores...
October 13, 2017: Intensive & Critical Care Nursing: the Official Journal of the British Association of Critical Care Nurses
https://www.readbyqxmd.com/read/29036889/single-administration-of-melatonin-modulates-the-nitroxidergic-system-at-the-peripheral-level-and-reduces-thermal-nociceptive-hypersensitivity-in-neuropathic-rats
#17
Elisa Borsani, Barbara Buffoli, Veronica Bonazza, Russel J Reiter, Rita Rezzani, Luigi F Rodella
Neuropathic pain is a severe condition with unsatisfactory treatments. Melatonin, an indolamine, seems to be a promising molecule suitable for this purpose due to its well-known anti-inflammatory, analgesic, and antioxidant effects, as well as its modulation of the nitroxidergic system. Nevertheless, the data on its mechanism of action and potentialities are currently insufficient in this pathology, especially at the peripheral level. Thus, this work evaluated the effect of a single administration of melatonin in an established mononeuropathy pain model that monitors the behaviour and the changes in the nitroxidergic system in dorsal root ganglia and skin, which are affected by nervous impairment...
October 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29035722/multiple-complex-somatosensory-systems-in-mature-rat-molars-defined-by-immunohistochemistry
#18
Margaret R Byers, Leanne M Cornel
OBJECTIVE: Intradental sensory receptors trigger painful sensations and unperceived mechanosensitivity, but the receptor bases for those functions are only partly defined. We present new evidence here concerning complex endings of myelinated axons in rat molars. DESIGN: We sectioned mature rat jaws in sagittal and transverse planes to analyze neural immunoreactivity (IR) for parvalbumin, peripherin, neurofilament protein, neurotrophin receptors, synaptophysin, calcitonin gene-related peptide (CGRP), or mas-related g-protein-receptor-d (Mrgprd)...
September 29, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29035314/animal-toxins-providing-insights-into-trpv1-activation-mechanism
#19
REVIEW
Matan Geron, Adina Hazan, Avi Priel
Beyond providing evolutionary advantages, venoms offer unique research tools, as they were developed to target functionally important proteins and pathways. As a key pain receptor in the nociceptive pathway, transient receptor potential vanilloid 1 (TRPV1) of the TRP superfamily has been shown to be a target for several toxins, as a way of producing pain to deter predators. Importantly, TRPV1 is involved in thermoregulation, inflammation, and acute nociception. As such, toxins provide tools to understand TRPV1 activation and modulation, a critical step in advancing pain research and the development of novel analgesics...
October 16, 2017: Toxins
https://www.readbyqxmd.com/read/29033605/onabotulinum-toxin-a-in-the-treatment-of-chronic-migraine-patient-selection-and-special-considerations
#20
REVIEW
Piero Barbanti, Patrizia Ferroni
Discovered by serendipity, onabotulinum toxin A (BoNT-A) is the only US Food and Drug Administration-approved treatment for the prevention of chronic migraine (CM), one of the most disabling and burdensome human conditions. Its efficacy, safety and tolerability, proved by the largest and longest migraine therapeutic trial (the Phase III Research Evaluating Migraine Prophylaxis Therapy program [PREEMPT]), have been replicated by various real-life studies also in the presence of medication overuse. The benefit of BoNT-A prophylaxis is likely due to its ability to counteract peripheral and central nociceptive sensitization through reversible chemical denervation of pericranial sensitive afferents...
2017: Journal of Pain Research
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