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https://www.readbyqxmd.com/read/28211789/the-cortical-connectivity-of-the-periaqueductal-gray-and-the-conditioned-response-to-the-threat-of-breathlessness
#1
Olivia K Faull, Kyle Ts Pattinson
Previously we observed differential activation in individual columns of the periaqueductal grey (PAG) during breathlessness and its conditioned anticipation (Faull et al., 2016). Here, we have extended this work by determining how the individual columns of the PAG interact with higher cortical centres, both at rest and in the context of breathlessness threat. Activation was observed in ventrolateral PAG (vlPAG) and lateral PAG (lPAG), where activity scaled with breathlessness intensity ratings, revealing a potential interface between sensation and cognition during breathlessness...
February 17, 2017: ELife
https://www.readbyqxmd.com/read/28206989/il-4-mediated-by-hsv-vector-suppresses-morphine-withdrawal-response-through-decreasing-tnf%C3%AE-nr2b-and-pc-ebp%C3%AE-in-the-periaqueductal-gray-in-rats
#2
H Yi, T Iida, S Liu, D Ikegami, Q Liu, A Iida, D A Lubarsky, S Hao
Chronic opiates induce the development of physical dependence. Opioid physical dependence characterized by withdrawal symptoms, may have very long-lasting effects on the motivation for reward, including the incubation of cue-induced drug-seeking behavior. Elucidation of the mechanisms involved in physical dependence is crucial to developing more effective treatment strategies for opioid dependence. Chronic morphine induces production of proinflammatory cytokines in regional-specific sites of the brain. Interleukin-4 (IL-4) is a prototypical anti-inflammatory cytokine that globally suppresses proinflammatory cytokines...
February 16, 2017: Gene Therapy
https://www.readbyqxmd.com/read/28194646/nanoemulsion-thermoreversible-pluronic-f127-based-hydrogel-containing-hyptis-pectinata-lamiaceae-leaf-essential-oil-produced-a-lasting-anti-hyperalgesic-effect-in-chronic-noninflammatory-widespread-pain-in-mice
#3
Lucindo J Quintans-Júnior, Renan G Brito, Jullyana S S Quintans, Priscila L Santos, Zaine T Camargo, Péricles A Barreto, Maria F Arrigoni-Blank, Waldecy Lucca-Júnior, Luciana Scotti, Marcus T Scotti, Sandra J Kolker, Kathleen A Sluka
We evaluated if a nanostructured thermoreversible Pluronic F127-based hydrogel incorporated with Hyptis pectinata leaf essential oil (NE-EOH) produces a long-lasting anti-hyperalgesic effect on chronic muscle pain in an animal model. We induced chronic muscle pain by injecting the gastrocnemius with saline injections. Paw and muscle withdrawal thresholds and motor performance were evaluated after treatment and compared with morphine, diazepam, or vehicle. Naloxone and methysergide administration tested the involvement of opioid and serotonin receptors, respectively...
February 13, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28162565/-328-divergent-pag-neuronal-populations-drive-nociceptive-and-pruritus-processing
#4
V Samineni, J Grajales-Reyes, B Copits, M Bruchas, R Gereau
No abstract text is available yet for this article.
April 2016: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/28155029/texture-features-of-periaqueductal-gray-in-the-patients-with-medication-overuse-headache
#5
Zhiye Chen, Xiaoyan Chen, Mengqi Liu, Shuangfeng Liu, Lin Ma, Shengyuan Yu
BACKGROUND: Periaqueductal gray (PAG) is the descending pain modulatory center, and PAG dysfunction had been recognized in migraine. Here we propose to investigate altered PAG texture features (quantitative approach for extracting texture descriptors for images) in the patients with medication-overuse headache (MOH) based on high resolution brain structural image to understand the MOH pathogenesis. METHODS: The brain structural images were obtained from 32 normal controls (NC) and 44 MOH patients on 3...
December 2017: Journal of Headache and Pain
https://www.readbyqxmd.com/read/28149015/role-of-bioflavonoid-quercetin-on-expression-of-urea-cycle-enzymes-astrocytic-and-inflammatory-markers-in-hyperammonemic-rats
#6
Sivamani Kanimozhi, Perumal Subramanian, Sakkaravarthy Shanmugapriya, Subramanian Sathishkumar
This study evaluates the role of quercetin on the expression of urea cycle enzymes, astrocytic, neuronal and inflammatory markers in hyperammonemic rats. Hyperammonemia (provoked by intraperitonial injections of (ammonium chloride-100 mg/kg b.w for 56 days), showed diminished expression of urea cycle enzymes [carbamyl phosphate synthetase-1 (CPS-1), ornithine transcarbamylase (OTC), argininosuccinate synthetase (ASS) and arginase (ARG)] in liver and decreased expression of neuronal and astrocytic markers-glutamine synthase (GS) and phosphate activated glutaminase (PAG) in brain and increased expression of brain inflammatory markers such as interleukin 6 (IL6), inducible nitric oxide synthase (iNOS) and nuclear transcription factor kappa B (NF-κB) (by western blot analysis) and exhibited downregulated expression of soluble guanylate cyclase (sGC), glial fibrillary acidic protein (GFAP) in brain and ASS in liver investigated (by RT-PCR)...
March 2017: Indian Journal of Clinical Biochemistry: IJCB
https://www.readbyqxmd.com/read/28147243/song-associated-reward-correlates-with-endocannabinoid-related-gene-expression-in-male-european-starlings-sturnus-vulgaris
#7
Allison H Hahn, Devin P Merullo, Jeremy A Spool, Caroline S Angyal, Sharon A Stevenson, Lauren V Riters
Vocal communication is required for successful social interactions in numerous species. During the breeding season, songbirds produce songs that are reinforced by behavioral consequences (e.g., copulation). However, some songbirds also produce songs not obviously directed at other individuals. The consequences maintaining or reinforcing these songs are less obvious and the neural mechanisms associated with undirected communication are not well-understood. Previous studies indicate that undirected singing is intrinsically rewarding and mediated by opioid or dopaminergic systems; however, endocannabinoids are also involved in regulating reward and singing behavior...
January 29, 2017: Neuroscience
https://www.readbyqxmd.com/read/28144808/volume-gain-of-periaqueductal-gray-in-medication-overuse-headache
#8
Zhiye Chen, Xiaoyan Chen, Mengqi Liu, Shuangfeng Liu, Lin Ma, Shengyuan Yu
BACKGROUND: Periaqueductal gray (PAG) is a substantial descending pain modulatory center, and previous voxel-based morphometry study confirmed the clusters with increased volume in PAG region in medication-overuse headache (MOH). The aim of this study is to investigate altered PAG volume in MOH using an automated PAG segment method to measure the true PAG volume. METHODS: High resolution three-dimensional T1-weighted fast spoiled gradient recalled echo MR images were obtained from 22 patients with MOH and 22 normal controls (NC)...
December 2017: Journal of Headache and Pain
https://www.readbyqxmd.com/read/28117739/affinin-spilanthol-isolated-from-heliopsis-longipes-induces-vasodilation-via-activation-of-gasotransmitters-and-prostacyclin-signaling-pathways
#9
Jesús Eduardo Castro-Ruiz, Alejandra Rojas-Molina, Francisco J Luna-Vázquez, Fausto Rivero-Cruz, Teresa García-Gasca, César Ibarra-Alvarado
Heliopsis longipes roots have been widely used in Mexican traditional medicine to relieve pain, mainly, toothaches. Previous studies have shown that affinin, the major alkamide of these roots, induces potent antinociceptive and anti-inflammatory activities. However, the effect of H. longipes root extracts and affinin on the cardiovascular system have not been investigated so far. In the present study, we demonstrated that the dichloromethane and ethanolic extracts of H. longipes roots, and affinin, isolated from these roots, produce a concentration-dependent vasodilation of rat aorta...
January 22, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28098766/single-electrode-deep-brain-stimulation-with-dual-targeting-at-dual-frequency-for-the-treatment-of-chronic-pain-a-case-series-and-review-of-the-literature
#10
REVIEW
Milo Hollingworth, Hugh P Sims-Williams, Anthony E Pickering, Neil Barua, Nikunj K Patel
Deep Brain Stimulation (DBS) has been used to target many deep brain structures for the treatment of chronic pain. The periaqueductal grey and periventricular grey (PAG/PVG) is an effective target but results are variable, sometimes short-lived or subject to tolerance. The centromedian intra-laminar parafascicular complex (CMPf) modulates medial pain pathways and CMPf DBS may address the affective aspects of pain perception. Stimulation of multiple deep brain targets may offer a strategy to optimize management of patients with complex pain symptomatology...
January 13, 2017: Brain Sciences
https://www.readbyqxmd.com/read/28096471/resolving-the-brainstem-contributions-to-attentional-analgesia-in-man
#11
Jonathan C W Brooks, Wendy-Elizabeth Davies, Anthony E Pickering
: Previous human imaging studies manipulating attention or expectancy have identified the periaqueductal gray (PAG) as a key brainstem structure implicated in endogenous analgesia. However, animal studies indicate that PAG analgesia is mediated largely via caudal brainstem structures like the rostral ventromedial medulla (RVM) and locus coeruleus (LC). To identify their involvement in endogenous analgesia, we used brainstem optimised, whole-brain imaging to record responses to concurrent thermal stimulation (left forearm) and visual attention tasks of titrated difficulty in 20 healthy subjects...
January 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28088038/evidence-of-functional-duplicity-of-nestin-expression-in-the-adult-mouse-midbrain
#12
Parisa Farzanehfar, Shi Sheng Lu, Anupa Dey, Dharshani Musiienko, Hamzah Baagil, Malcolm K Horne, Tim D Aumann
Whether or not neurogenesis occurs in the adult substantia nigra pars compacta (SNc) is an important question relevant for developing better treatments for the motor symptoms of Parkinson's disease (PD). Although controversial, it is generally believed that dividing cells here remain undifferentiated or differentiate into glia, not neurons. However, there is a suggestion that Nestin-expressing neural precursor cells (NPCs) in the adult SNc have a propensity to differentiate into neurons, which we sought to confirm in the present study...
January 5, 2017: Stem Cell Research
https://www.readbyqxmd.com/read/28057931/the-oprm1-a118g-polymorphism-modulates-the-descending-pain-modulatory-system-for-individual-pain-experience-in-young-women-with-primary-dysmenorrhea
#13
Shyh-Yuh Wei, Li-Fen Chen, Ming-Wei Lin, Wei-Chi Li, Intan Low, Ching-Ju Yang, Hsiang-Tai Chao, Jen-Chuen Hsieh
The mu-opioid receptor (OPRM1) A118G polymorphism underpins different pain sensitivity and opioid-analgesic outcome with unclear effect on the descending pain modulatory system (DPMS). Primary dysmenorrhea (PDM), the most prevalent gynecological problem with clear painful and pain free conditions, serves as a good clinical model of spontaneous pain. The objective of this imaging genetics study was therefore to explore if differences in functional connectivity (FC) of the DPMS between the OPRM1 A118G polymorphisms could provide a possible explanation for the differences in pain experience...
January 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28043363/time-dependent-changes-in-pregnancy-associated-glycoproteins-and-progesterone-in-commercial-crossbred-sheep
#14
J N Roberts, K J May, A Veiga-Lopez
The ruminant placenta functions as an endocrine and paracrine organ secreting proteins, growth factors, and steroid hormones, including pregnancy-associated glycoproteins (PAG), proteins with elusive function, which are readily detectable in maternal serum after placental attachment. In sheep, circulating progesterone beyond gestational Day 50 is predominantly of placental origin. The relationship among placental secreted factors, including progesterone, remains uncertain in sheep. The first aim of the study was to determine the relationship between gestational PAG profiles-using two commercial ELISA assays-progesterone, and fetal growth during pregnancy...
February 2017: Theriogenology
https://www.readbyqxmd.com/read/28043340/using-real-time-pcr-to-identify-pregnancy-associated-glycoprotein-2-pag-2-in-water-buffalo-bubalus-bubalis-blood-in-early-pregnancy
#15
O Barbato, G Guelfi, V L Barile, L Menchetti, C Tortiello, C Canali, G Brecchia, G Traina, J F Beckers, N Melo de Sousa
This study investigates for the first time mRNA pregnancy-associated glycoprotein 2 (PAG-2) expression in blood cells during early pregnancy in water buffalo. The PAGs constitute a large family of glycoproteins expressed in the outer epithelial layer of the placenta in eutherian species. All PAGs are not concomitantly expressed throughout pregnancy; some of them are expressed in the earlier phases, whereas others appear later and are expressed over a shorter period. Twenty-one lactating buffaloes were analyzed-17 females were synchronized with PRID and artificially inseminated (AI), whereas four females were synchronized but not inseminated (control group)...
February 2017: Theriogenology
https://www.readbyqxmd.com/read/28032002/fmri-functional-connectivity-of-the-periaqueductal-gray-in-ptsd-and-its-dissociative-subtype
#16
Sherain Harricharan, Daniela Rabellino, Paul A Frewen, Maria Densmore, Jean Théberge, Margaret C McKinnon, Allan N Schore, Ruth A Lanius
BACKGROUND: Posttraumatic stress disorder (PTSD) is associated with hyperarousal and active fight or flight defensive responses. By contrast, the dissociative subtype of PTSD, characterized by depersonalization and derealization symptoms, is frequently accompanied by additional passive or submissive defensive responses associated with autonomic blunting. Here, the periaqueductal gray (PAG) plays a central role in defensive responses, where the dorsolateral (DL-PAG) and ventrolateral PAG (VL-PAG) are thought to mediate active and passive defensive responses, respectively...
December 2016: Brain and Behavior
https://www.readbyqxmd.com/read/28029133/cinnamaldehyde-ameliorates-cadmium-inhibited-root-elongation-in-tobacco-seedlings-via-decreasing-endogenous-hydrogen-sulfide-production
#17
Xie-Feng Ye, Yanfeng Xue, Tianxiao Ling, Yong Wang, Xiao-Na Yu, Changxin Cheng, Guosheng Feng, Liangbin Hu, Zhiqi Shi, Jian Chen
Cinnamaldehyde (CA) is natural plant-derived compound that has been highly appreciated for its medicinal properties. However, little information is known about the regulation of plant intrinsic physiology by CA. To address these gaps, physiological, histochemical, and biochemical approaches were applied to investigate CA-facilitated cadmium (Cd) tolerance in the roots of tobacco (Nicotiana tabacum) seedlings. Treatment with CdCl₂ at 20 μM for 72 h resulted in the significant decrease in root elongation by 40...
December 24, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28019708/revealing-the-inventory-of-type-iii-effectors-in-pantoea-agglomerans-gall-forming-pathovars-by-using-draft-genome-sequences-and-a-machine-learning-approach
#18
Gal Nissan, Michael Gershovits, Michael Morozov, Laura Chalupowicz, Guido Sessa, Shulamit Manulis-Sasson, Isaac Barash, Tal Pupko
Pantoea agglomerans, a widespread epiphytic bacterium, has evolved into a hrp-dependent and host-specific gall-forming pathogen by acquiring a pathogenicity plasmid containing a type III secretion system (T3SS) and its effectors (T3Es). P. agglomerans pv. betae (Pab) elicits galls on beet (Beta vulgaris) and gypsophila (Gypsophila paniculata), whereas P. agglomerans pv. gypsophilae (Pag) incites galls on gypsophila and hypersensitive response (HR) on beet. Draft genome sequences were generated and employed in combination with a machine learning approach and a translocation assay into beet roots to identify the pools of T3Es in the two pathovars...
December 26, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28003867/what-makes-a-compliant-phase-iii-and-pre-launch-patient-advocacy-strategy
#19
Nick Hicks, Keith Allan, Christoph Thalheim, Paul Woods
BACKGROUND: A key task for the pharmaceutical industry is to understand the compliance implications of engaging with a patient advocacy group (PAG). This presents challenges for the industry to negotiate the ethical and reputational issues that can arise when working with a PAG. OBJECTIVE: To gain the views of pharmaceutical industry executives on future compliance challenges when working with PAGs. STUDY DESIGN: We conducted two surveys among two sets of industry executives: one group focussed on market access roles and the other focussed on non-market access roles...
2016: Journal of Market Access & Health Policy
https://www.readbyqxmd.com/read/27988316/effect-of-melatonin-injection-into-the-periaqueductal-gray-on-antinociception-and-tonic-immobility-in-male-rats
#20
Abraham Miranda-Páez, Sergio R Zamudio, Priscila Vázquez-León, Vicente Sandoval-Herrera, Ivan Villanueva-Becerril, Giancarlo Carli
Melatonin (MLT) is a neurohormone with significant involvement in several biological functions, of which antinociception and tonic immobility (TI) may be the key neurobehavioral components to survive in adverse conditions such as a predator attack. TI-induced antinociception can be elicited, facilitated, or increased through opioid and γ-aminobutyric acid (GABA) among other chemical mediators at several levels of the central nervous system, mainly in the periaqueductal gray (PAG). The aim of this study was to assess the effect of the microinjection of MLT into the main PAG regions that are related to different integrated defensive responses, namely dorsal (D) and ventrolateral (VL), on both antinociception through the tail-flick (TF) test and TI duration as single behavioral response and on combined behavioral responses (TF/TI)...
December 15, 2016: Hormones and Behavior
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