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Diffuse noxious inhibitory control

Karen-Amanda Irvine, Peyman Sahbaie, De-Yong Liang, David Clark
Chronic pain is a common consequence of traumatic brain injury (TBI) that can increase a patient's suffering and pose a significant challenge to rehabilitative efforts. Unfortunately, the mechanisms linking TBI to pain are poorly understood and specific treatments for TBI-related pain are still lacking. Our lab has shown that TBI causes pain sensitization in areas distant to the site of primary injury, and that changes in spinal gene expression may underlie this sensitization1, 2. The aim of this study was to examine the roles that pain modulatory pathways descending from the brainstem play in pain after TBI...
January 26, 2018: Journal of Neurotrauma
Kelsey M Nation, Milena De Felice, Pablo I Hernandez, David W Dodick, Volker Neugebauer, Edita Navratilova, Frank Porreca
The response of diffuse noxious inhibitory controls (DNIC) is often decreased, or lost, in stress-related functional pain syndromes. Because the dynorphin/kappa opioid receptor (KOR) pathway is activated by stress, we determined its role in DNIC using a model of stress-induced functional pain. Male, Sprague-Dawley rats were primed for 7 days with systemic morphine resulting in opioid-induced hyperalgesia. Fourteen days after priming, when hyperalgesia was resolved, rats were exposed to environmental stress and DNIC was evaluated by measuring hind paw response threshold to noxious pressure (test stimulus) after capsaicin injection in the forepaw (conditioning stimulus)...
January 23, 2018: Pain
Yukiko Shiro, Tatsunori Ikemoto, Yuta Terasawa, Young-Chang P Arai, Kazuhiro Hayashi, Takahiro Ushida, Takako Matsubara
BACKGROUND: Conditioned pain modulation (CPM), a phenomenon also known as diffuse noxious inhibitory control, is thought to be affected by various factors, including sex and level of physical activity. However, the involvement of these factors in CPM remains unclear. METHODS: Eighty-six healthy young subjects (M/F, 43/43) participated in this study. Participants were assessed on the basis of their mechanical pressure pain threshold (PPT), CPM response, body mass index (BMI), basal metabolic rate (BMR), and duration of moderate-to-vigorous physical activity (MVPA) over a week, using a motion counter...
2017: Pain Research & Management: the Journal of the Canadian Pain Society
A Smith, A Pedler
BACKGROUND: Various conditioned pain modulation (CPM) methodologies have been used to investigate diffuse noxious inhibitory control pain mechanisms in healthy and clinical populations. Occlusion cuff parameters have been poorly studied. We aimed to investigate whether occlusion cuff intensity and/or duration influenced CPM magnitudes. We also investigated the role of physical activity levels on CPM magnitude. METHODS: Two studies were performed to investigate the role of intensity and duration of occlusion cuff conditioning stimulus on test stimulus (tibialis anterior pressure pain thresholds)...
August 14, 2017: European Journal of Pain: EJP
Nelly Boyer, Jérémy Signoret-Genest, Alain Artola, Radhouane Dallel, Lénaïc Monconduit
Migraine is currently conceptualized as a chronic disease with episodic manifestations. In some patients, migraine attack frequency increases, leading to chronic migraine. Daily preventive therapy is initiated to decrease attack frequency. Propranolol, a first-line medication for migraine prophylaxis, reduces attack frequency in nearly 50% of patients receiving it. However, the mechanisms of its antimigraine action are unclear. We examined the effect of daily propranolol treatment (10 mg·kg per os, 8 days) in a rat model of recurrent activation of dural nociceptors (repeated infusion of an inflammatory soup (IS) on the dura through a cannula every 2-3 days)...
July 8, 2017: Pain
Kirsty Bannister, Mateusz Kucharczyk, Anthony H Dickenson
Here we aim to present an accessible review of the pharmacological targets for pain management, and succinctly discuss the newest trends in pain therapy. A key task for current pain pharmacotherapy is the identification of receptors and channels orchestrating nociception. Notwithstanding peripheral alterations in the receptors and channels following pathophysiological events, the modulatory mechanisms in the central nervous system are also fundamental to the regulation of pain perception. Bridging preclinical and clinical studies of peripheral and central components of pain modulation, we present the different types of pain and relate these to pharmacological interventions...
December 2017: Pain and Therapy
Joseph V Pergolizzi, Frank Breve, Robert Taylor, Robert B Raffa, Stephani E Strasburger, Jo Ann LeQuang
Tapentadol is the newest centrally acting analgesic to be approved by the US FDA and regulatory bodies in other countries. It has been called the first-in-class of a novel-acting analgesic mechanism of action that combines µ-opioid receptor agonist activity with neuronal norepinephrine-reuptake inhibition in a single molecule. This duality of action should combine inhibition of ascending (afferent) pain-transmitting signals with activation of descending (efferent) pain-attenuating systems (e.g., diffuse noxious inhibitory controls)...
July 2017: Pain Management
Kirsty Bannister, A H Dickenson
Descending controls, comprising pathways that originate in midbrain and brainstem regions and project onto the spinal cord, have long been recognised as key links in the multiple neural networks that interact to produce the overall pain experience. There is clear evidence from preclinical and clinical studies that both peripheral and central sensitisation play important roles in determining the level of pain perceived. Much emphasis has been put on spinal cord mechanisms in central excitability, but it is now becoming clear that spinal hyperexcitability can be regulated by descending pathways from the brain that originate from predominantly noradrenergic and serotonergic systems...
July 1, 2017: Journal of Physiology
K Bannister, S Lockwood, L Goncalves, R Patel, A H Dickenson
BACKGROUND: Following neuropathy α2-adrenoceptor-mediated diffuse noxious inhibitory controls (DNIC), whereby a noxious conditioning stimulus inhibits the activity of spinal wide dynamic range (WDR) neurons, are abolished, and spinal 5-HT7 receptor densities are increased. Here, we manipulate spinal 5-HT content in spinal nerve ligated (SNL) animals and investigate which 5-HT receptor mediated actions predominate. METHODS: Using in vivo electrophysiology we recorded WDR neuronal responses to von frey filaments applied to the hind paw before, and concurrent to, a noxious ear pinch (the conditioning stimulus) in isoflurane-anaesthetised rats...
April 2017: European Journal of Pain: EJP
J Meléndez-Gallardo, A Eblen-Zajjur
Most of the endogenous pain modulation (EPM) involves the spinal dorsal horn (SDH). EPM including diffuse noxious inhibitory controls have been extensively described in oligoneuronal electrophysiological recordings but less attention had been paid to responses of the SDH neuronal population to heterotopic noxious stimulation (HNS). Spinal somatosensory-evoked potentials (SEP) offer the possibility to evaluate the neuronal network behavior, reflecting the incoming afferent volleys along the entry root, SDH interneuron activities and the primary afferent depolarization...
September 2016: Neurological Sciences
Yasuo Itomi, Yasuhiro Tsukimi, Toru Kawamura
Fibromyalgia is characterized by chronic widespread musculoskeletal pain. A hypofunction in descending pain inhibitory systems is considered to be involved in the chronic pain of fibromyalgia. We examined functional changes in descending pain inhibitory systems in rats with specific alternation of rhythm in temperature (SART) stress, by measuring the strength of diffuse noxious inhibitory controls (DNIC). Hindpaw withdrawal thresholds to mechanical von Frey filament or fiber-specific electrical stimuli by the Neurometer system were used to measure the pain response...
August 5, 2016: European Journal of Pharmacology
Suzuro Hitomi, Konrad Kross, Masayuki Kurose, Frank Porreca, Ian D Meng
AIMS: Overuse of medications used to treat migraine headache can increase the frequency of headaches. Sudden abstinence from migraine medication can also lead to a period of withdrawal-induced headaches. The aim of this study was to examine the effect of morphine withdrawal localized to the rostral ventromedial medulla (RVM) on the activity of dura-sensitive spinal trigeminal nucleus caudalis (Vc) neurons. METHODS: Rats were implanted with either morphine or placebo pellets for six to seven days before the microinjection of naloxone methiodide or phosphate-buffered saline into the RVM in urethane-anesthetized animals...
May 6, 2016: Cephalalgia: An International Journal of Headache
Nabi Rustamov, Jessica Tessier, Benjamin Provencher, Alexandre Lehmann, Mathieu Piché
Heterotopic noxious counter-stimulation (HNCS) inhibits pain and pain processes through cerebral and cerebrospinal mechanisms. However, it is unclear whether HNCS inhibits non-nociceptive processes, which needs to be clarified for a better understanding of HNCS analgesia. The aim of this study was to examine the effects of HNCS on perception and scalp somatosensory evoked potentials (SEPs). Seventeen healthy volunteers participated in two counter-balanced sessions, including non-nociceptive (selective Aβ-fibre activation) or nociceptive electrical stimulation, combined with HNCS...
July 2016: European Journal of Neuroscience
Bahar Shahidi, Douglas Curran-Everett, Katrina S Maluf
UNLABELLED: The purpose of this investigation was to identify modifiable risk factors for the development of first-onset chronic neck pain among an inception cohort of healthy individuals working in a high-risk occupation. Candidate risk factors identified from previous studies were categorized into psychosocial, physical, and neurophysiological domains, which were assessed concurrently in a baseline evaluation of 171 office workers within the first 3 months of hire. Participants completed monthly online surveys over the subsequent year to identify the presence of chronic interfering neck pain, defined as a Neck Disability Index score ≥5 points for 3 or more months...
December 2015: Journal of Pain: Official Journal of the American Pain Society
Diana M Torta, Maxim V Churyukanov, Leon Plaghki, André Mouraux
Human studies have shown that heterotopic nociceptive conditioning stimulation (HNCS) applied to a given body location reduces the percept and brain responses elicited by noxious test stimuli delivered at a remote body location. It remains unclear to what extent this effect of HNCS relies on the spinal-bulbar-spinal loop mediating the effect of diffuse noxious inhibitory controls (DNICs) described in animals, and/or on top-down cortical mechanisms modulating nociception. Importantly, some studies have examined the effects of HNCS on the brain responses to nociceptive input conveyed by Aδ-fibres...
November 2015: European Journal of Neuroscience
Yasuo Itomi, Toru Kawamura, Yasuhiro Tsukimi
It is known that specific alteration of rhythm in temperature (SART) stress produces somatic pain. However, it remains to be investigated whether SART stress induces visceral pain. In this study, we investigated the visceral hypersensitivity in the SART stress model by pharmacological tools and heterotopical nociception. Four-week-old Sprague-Dawley rats were exposed to repeated cold stress. Visceral pain was measured by visceromotor response to colorectal distension, and the effects of alosetron and duloxetine on visceral pain were investigated in SART rats...
September 2015: Journal of Pharmacological Sciences
Kirsty Bannister, Ryan Patel, Leonor Goncalves, Louisa Townson, Anthony H Dickenson
Diffuse noxious inhibitory controls (DNICs) utilize descending inhibitory controls through poorly understood brain stem pathways. The human counterpart, conditioned pain modulation, is reduced in patients with neuropathy aligned with animal data showing a loss of descending inhibitory noradrenaline controls together with a gain of 5-HT3 receptor-mediated facilitations after neuropathy. We investigated the pharmacological basis of DNIC and whether it can be restored after neuropathy. Deep dorsal horn neurons were activated by von Frey filaments applied to the hind paw, and DNIC was induced by a pinch applied to the ear in isoflurane-anaesthetized animals...
September 2015: Pain
Lin-lin Shen, Guo-fu Huang, Wen Tian, Ling-ling Yu, Xiao-cui Yuan, Zhao-qing Zhang, Jing Yin, Chao-yang Ma, Guo-wei Cai, Jian-wu Li, Ming-qiao Ding, Wei He, Xin-yan Gao, Bing Zhu, Xiang-hong Jing, Man Li
BACKGROUND: Previous studies have shown that electroacupuncture (EA) has a significant effect on acute pain, but it has not solved the clinical problem of the chronification of acute pain. Diffuse noxious inhibitory controls (DNIC) function as a reliable indicator to predict the risk of chronic pain events. DNIC function in knee osteoarthritis (KOA) patients has been demonstrated to gradually decrease during the development of chronic pain. The purpose of this study is to conduct a randomized, controlled clinical trial to determine if EA can repair impaired DNIC function and thus prevent chronification of the acute pain of KOA...
2015: Trials
Eric Osgood, Jeremiah J Trudeau, Thomas A Eaton, Mark P Jensen, Arnold Gammaitoni, Lee S Simon, Nathaniel Katz
There are no standardized bedside assessments for subtyping patients with osteoarthritis (OA) based on pain mechanisms. Thus, we developed a bedside sensory testing kit (BSTK) to classify OA patients based on sensory profiles potentially indicative of pain mechanism. After usability and informal reliability testing (n = 22), the kit was tested in a formal reliability study (n = 20). Patients completed questionnaires and sensory testing: pressure algometry to detect hyperalgesia; repeat algometry after heterotopic noxious conditioning stimulation to measure diffuse noxious inhibitory control (DNIC); light touch using Von Frey filaments; and cold allodynia using a brass rod...
June 2015: Rheumatology International
Yi Zhang, Shihab Ahmed, Trang Vo, Kristin St Hilaire, Mary Houghton, Abigail S Cohen, Jianren Mao, Lucy Chen
OBJECTIVE: The aim of this study was to compare the sensitivity to experimental pain of chronic pain patients on opioid therapy vs chronic pain patients on non-opioid therapy and healthy subjects by quantitative sensory testing (QST). SETTING: There is a growing body of evidence demonstrating that chronic use of opioid drugs may alter pain sensitivity. Identifying the characteristic changes in thermal pain sensitivity in chronic opioid users will be helpful in diagnosing pain sensitivity alterations associated with chronic opioid use...
May 2015: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
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