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https://www.readbyqxmd.com/read/28624575/intestinal-fungal-dysbiosis-associates-with-visceral-hypersensitivity-in-patients-with-irritable-bowel-syndrome-and-rats
#1
Sara Botschuijver, Guus Roeselers, Evgeni Levin, Daisy M Jonkers, Olaf Welting, Sigrid Em Heinsbroek, Heleen H de Weerd, Teun Boekhout, Matteo Fornai, Ad A Masclee, Frank H J Schuren, Wouter J de Jonge, Jurgen Seppen, Rene M van den Wijngaard
BACKGROUND & AIMS: Visceral hypersensitivity is one feature of irritable bowel syndrome (IBS). Bacterial dysbiosis might be involved in activation of nociceptive sensory pathways, but there have been few studies of the role of the mycobiome (the fungal microbiome) in development of IBS. We analyzed intestinal mycobiomes of patients with IBS and a rat model of visceral hypersensitivity. METHODS: We used internal transcribed spacer 1-based metabarcoding to compare fecal mycobiomes of 18 healthy volunteers with those of 39 patients with IBS (with visceral hypersensitivity or normal levels of sensitivity)...
June 14, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28595328/genetic-lineage-tracing-in-taste-tissues-using-sox2-creert2-strain
#2
Makoto Ohmoto, Wenwen Ren, Yugo Nishiguchi, Junji Hirota, Peihua Jiang, Ichiro Matsumoto
Taste cells in taste buds are epithelial sensory cells. Old taste bud cells die and are replaced by new ones generated from taste stem cells. Identifying and characterizing adult taste stem cells is therefore important to understand how peripheral taste tissues are maintained. SOX2 is expressed in oral epithelium including gustatory papillae and has been proposed to be a marker of adult taste stem/progenitor cells. Nevertheless, this hypothesis has never been directly tested. Here, by single-color genetic lineage tracing using Sox2-CreERT2 strain, we reveal that all types of taste bud cells distributed throughout the oral epithelium are derived from stem cells that express SOX2...
June 8, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28573724/human-roughness-perception-and-possible-factors-effecting-roughness-sensation
#3
Tugba Aktar, Jianshe Chen, Rammile Ettelaie, Melvin Holmes, Brian Henson
Surface texture sensation is significant for business success, in particular for solid surfaces for most of the materials; including foods. Mechanisms of roughness perception are still unknown, especially under different conditions such as lubricants with varying viscosities, different temperatures, or under different force loads during the observation of the surface. This work aims to determine the effect of those unknown factors, with applied sensory tests on 62 healthy participants. Roughness sensation of fingertip was tested under different lubricants including water and diluted syrup solutions at room temperature (25C) and body temperature (37C) by using simple pair-wise comparison to observe the just noticeable difference threshold and perception levels...
June 2017: Journal of Texture Studies
https://www.readbyqxmd.com/read/28573374/effects-of-trpv1-and-trpa1-activators-on-the-cramp-threshold-frequency-a-randomized-double-blind-placebo-controlled-trial
#4
Michael Behringer, Stephanie Nowak, Jannik Leyendecker, Joachim Mester
PURPOSE: Previous data indicate that a strong sensory input from orally administered TRPV1 and TRPA1 activators alleviates muscle cramps in foot muscles by reducing the α-motor neuron hyperexcitability. We investigated if TRP activators increase the cramp threshold frequency of the medial gastrocnemius. METHODS: We randomly assigned 22 healthy male participants to an intervention (IG) and a control group (CG). While participants of the IG ingested a mixture of TRPV1 and TRPA1 activators, the CG received a placebo...
June 1, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28556911/a-comparison-of-the-lubrication-behavior-of-whey-protein-model-foods-using-tribology-in-linear-and-elliptical-movement
#5
Caroline L Campbell, E Allen Foegeding, Fred van de Velde
Lubrication is an important factor in the sensory evaluation of food products. Tribology provides a theoretical framework and instrumental methods for evaluating frictional properties between two moving surfaces and the lubrication behavior of products between these surfaces. Relating frictional measurements to sensory properties detected during oral processing requires careful and pertinent choices in surface materials and testing conditions. The aims of this study were to investigate: (a) differences in lubrication behavior of a range of food textures and (b) the differences between linear and elliptical movement and added saliva to understand the contribution of food structure to friction...
May 29, 2017: Journal of Texture Studies
https://www.readbyqxmd.com/read/28556476/neurophysiological-changes-associated-with-implant-associated-augmentation-procedures-in-the-lower-jaw
#6
Amely Hartmann, Claudia Welte-Jzyk, Marcus Seiler, Monika Daubländer
BACKGROUND: Neurophysiological changes after oral and maxillofacial surgery remain one of the topics of current research. PURPOSE: This study evaluated if implant placement associated with augmentation procedures increases the possibility of sensory disturbances or result in impaired quality of life during the healing period. MATERIAL AND METHODS: Patients who had obtained an implant placement in the lower jaw in combination with augmentation procedures were examined by implementing a comprehensive Quantitative Sensory Testing (QST) protocol for extra- and intraoral use...
May 29, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/28425479/perturbed-oral-motor-control-due-to-anesthesia-during-intraoral-manipulation-of-food
#7
Joannis Grigoriadis, Abhishek Kumar, Peter Svensson, Krister G Svensson, Mats Trulsson
Sensory information from periodontal mechanoreceptors (PMRs) surrounding the roots of natural teeth is important for optimizing the positioning of food and adjustment of force vectors during precision biting. The present experiment was designed to test the hypothesis; that reduction of afferent inputs from the PMRs, by anesthesia, perturbs the oral fine motor control and related jaw movements during intraoral manipulation of morsels of food. Thirty healthy volunteers with a natural dentition were equally divided into experimental and control groups...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28419471/spectral-analysis-of-the-stick-slip-phenomenon-in-oral-tribological-texture-evaluation
#8
Solange Sanahuja, Rutuja Upadhyay, Heiko Briesen, Jianshe Chen
"Oral" tribology has become a new paradigm in food texture studies to understand complex texture attributes, such as creaminess, oiliness, and astringency, which could not be successfully characterized by traditional texture analysis nor by rheology. Stick-slip effects resulting from intermittent sliding motion during kinetic friction of oral mucosa could constitute an additional determining factor of sensory perception where traditional friction coefficient values and their Stribeck regimes fail in predicting different lubricant (food bolus and saliva) behaviors...
March 28, 2017: Journal of Texture Studies
https://www.readbyqxmd.com/read/28418172/analgesic-effect-of-clobazam-in-chronic-low-back-pain-but-not-in-experimentally-induced-pain
#9
J Schliessbach, P H Vuilleumier, A Siegenthaler, L Bütikofer, A Limacher, P Juni, H U Zeilhofer, L Arendt-Nielsen, M Curatolo
BACKGROUND: Chronic pain is frequently associated with hypersensitivity of the nervous system, and drugs that increase central inhibition are therefore a potentially effective treatment. Benzodiazepines are potent modulators of GABAergic neurotransmission and are known to exert antihyperalgesic effects in rodents, but translation into patients are lacking. This study investigates the effect of the benzodiazepine clobazam in chronic low-back pain in humans. The aim of this study is to explore the effect of GABA modulation on chronic low-back pain and on quantitative sensory tests...
April 18, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28372503/assessment-of-lingual-nerve-functions-after-smoking-cessation
#10
Anne Barbara Rittich, Jens Ellrich, Sareh Said Yekta-Michael
OBJECTIVE: Cigarette smoking is associated with a variety of oral diseases. A previous study showed a reduction of thermal sensitivity in the innervation area of the lingual nerve in smokers possibly caused by a degeneration of thermosensitive receptors as a consequence of smoking. The current study investigates somatosensory changes in ex-smokers. MATERIALS AND METHODS: Sensory functions in innervation areas of lingual nerve were investigated in 40 ex-smokers by psychophysical means...
April 3, 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/28367901/changes-in-oral-stereognosis-of-healthy-adults-by-age
#11
Jin-Hyuck Park
Rehabilitation for dysfunctions of eating and swallowing should be considered in terms of not only motor but also sensory function. Sensory information from a bolus in the mouth plays an important role in eating and swallowing. Therefore, this study investigated oral stereognosis in 184 healthy adults with normal eating and swallowing function in order to obtain normative data. Oral stereognosis was assessed by using 20 intra-oral test pieces with different shapes. The subjects manipulated the test pieces in the mouth and identified their shapes...
2017: Journal of Oral Science
https://www.readbyqxmd.com/read/28361126/pressure-sensitivity-and-phenotypic-changes-in-patients-with-suspected-opioid-induced-hyperalgesia-being-withdrawn-from-full-mu-agonists
#12
Ronald A Wasserman, Afton L Hassett, Steven E Harte, Jenna Goesling, Herbert L Malinoff, Daniel W Berland, Jennifer Zollars, Stephanie E Moser, Chad M Brummett
OBJECTIVES: To assess changes in phenotype and pressure sensitivity in patients with suspected opioid-induced-hyperalgesia (OIH) after transitioning to buprenorphine. METHODS: Twenty patients with suspected OIH were enrolled to transition to buprenorphine therapy. Patients completed validated self-report measures at baseline and at 1, 4, 8 weeks, and 6 months after initiation of buprenorphine along with quantitative sensory testing including measures of pressure pain threshold, pain tolerance and Pain 50 (a pain intensity rating)...
February 2017: Journal of Nature and Science
https://www.readbyqxmd.com/read/28358815/azalep-a-randomized-controlled-trial-of-azathioprine-to-treat-leprosy-nerve-damage-and-type-1-reactions-in-india-main-findings
#13
RANDOMIZED CONTROLLED TRIAL
Diana N J Lockwood, Joydeepa Darlong, Pitchaimani Govindharaj, Royce Kurian, Pamidipani Sundarrao, Annamma S John
BACKGROUND: Leprosy Type 1 reactions are difficult to treat and only 70% of patients respond to steroid treatment. Azathioprine has been used as an immune-suppressant and we tested its efficacy in treating leprosy T1R. METHODOLOGY: Randomised controlled trial adding azathioprine to steroid treatment for leprosy reactions. This trial was conducted in four leprosy hospitals in India. Patients with a new leprosy Type 1 reaction affecting either skin or nerve were recruited...
March 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28346814/nicotinamide-riboside-a-form-of-vitamin-b3-and-nad-precursor-relieves-the-nociceptive-and-aversive-dimensions-of-paclitaxel-induced-peripheral-neuropathy-in-female-rats
#14
Marta V Hamity, Stephanie R White, Roxanne Y Walder, Mark S Schmidt, Charles Brenner, Donna L Hammond
Injury to sensory afferents may contribute to the peripheral neuropathies that develop after administration of chemotherapeutic agents. Manipulations that increase levels of nicotinamide adenine dinucleotide (NAD) can protect against neuronal injury. This study examined whether nicotinamide riboside (NR), a third form of vitamin B3 and precursor of NAD, diminishes tactile hypersensitivity and place escape-avoidance behaviors in a rodent model of paclitaxel-induced peripheral neuropathy. Female Sprague-Dawley rats received 3 intravenous injections of 6...
May 2017: Pain
https://www.readbyqxmd.com/read/28286285/minocycline-reduces-mechanical-allodynia-and-depressive-like-behaviour-in-type-1-diabetes-mellitus-in-the-rat
#15
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...
June 1, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28271438/short-term-follow-up-of-masticatory-adaptation-after-rehabilitation-with-an-immediately-loaded-implant-supported-prosthesis-a-pilot-assessment
#16
Mihoko Tanaka, Collaert Bruno, Reinhilde Jacobs, Tetsurou Torisu, Hiroshi Murata
BACKGROUND: When teeth are extracted, sensory function is decreased by a loss of periodontal ligament receptions. When replacing teeth by oral implants, one hopes to restore the sensory feedback pathway as such to allow for physiological implant integration and optimized oral function with implant-supported prostheses. What remains to be investigated is how to adapt to different oral rehabilitations. The purpose of this pilot study was to assess four aspects of masticatory adaptation after rehabilitation with an immediately loaded implant-supported prosthesis and to observe how each aspect will recover respectively...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28215812/indoor-air-pollutants-ventilation-rate-determinants-and-potential-control-strategies-in-chinese-dwellings-a-literature-review
#17
Wei Ye, Xu Zhang, Jun Gao, Guangyu Cao, Xiang Zhou, Xing Su
After nearly twenty years of rapid modernization and urbanization in China, huge achievements have transformed the daily lives of the Chinese people. However, unprecedented environmental consequences in both indoor and outdoor environments have accompanied this progress and have triggered public awareness and demands for improved living standards, especially in residential environments. Indoor pollution data measured for >7000 dwellings (approximately 1/3 were newly decorated and were tested for volatile organic compound (VOC) measurements, while the rest were tested for particles, phthalates and other semi-volatile organic compounds (SVOCs), moisture/mold, inorganic gases and radon) in China within the last ten years were reviewed, summarized and compared with indoor concentration recommendations based on sensory or health end-points...
May 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28203479/metformin-impairs-spatial-memory-and-visual-acuity-in-old-male-mice
#18
Nopporn Thangthaeng, Margaret Rutledge, Jessica M Wong, Philip H Vann, Michael J Forster, Nathalie Sumien
Metformin is an oral anti-diabetic used as first-line therapy for type 2 diabetes. Because benefits of metformin extend beyond diabetes to other age-related pathology, and because its effect on gene expression profiles resembles that of caloric restriction, metformin has a potential as an anti-aging intervention and may soon be assessed as an intervention to extend healthspan. However, beneficial actions of metformin in the central nervous system have not been clearly established. The current study examined the effect of chronic oral metformin treatment on motor and cognitive function when initiated in young, middle-aged, or old male mice...
February 2017: Aging and Disease
https://www.readbyqxmd.com/read/28190463/prophylactic-topical-paeoniflorin-prevents-mechanical-allodynia-caused-by-paclitaxel-in-mice-through-adenosine-a1-receptors
#19
Tsugunobu Andoh, Nao Kobayashi, Daisuke Uta, Yasushi Kuraishi
BACKGROUND: The chemotherapeutic agent paclitaxel (PTX) causes refractory peripheral neuropathy as a side effect. Prophylactic oral administration of the traditional herbal medicine Shakuyakukanzoto containing Paeoniae Radix and Glycyrrhizae Radix prevents the development of PTX-induced mechanical allodynia in mice via peripheral effects, mostly due to Paeoniae Radix. However, the bioactive component responsible for the prevention of PTX-induced neuropathic pain remains unknown. PURPOSE: To determine whether a monoterpene glycoside paeoniflorin (PF), which is the principal bioactive constituent of Paeoniae Radix, has inhibitory effects on PTX-induced mechanical allodynia and investigate the underlying mechanisms...
February 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28166091/oral-polyphosphate-suppresses-bacterial-collagenase-production-and-prevents-anastomotic-leak-due-to-serratia-marcescens-and-pseudomonas-aeruginosa
#20
Sanjiv K Hyoju, Robin E Klabbers, Melissa Aaron, Monika A Krezalek, Alexander Zaborin, Mara Wiegerinck, Neil H Hyman, Olga Zaborina, Harry Van Goor, John C Alverdy
OBJECTIVE: The objective of this study was to determine the effect of polyphosphate on intestinal bacterial collagenase production and anastomotic leak in mice undergoing colon surgery. BACKGROUND: We have previously shown that anastomotic leak can be caused by intestinal pathogens that produce collagenase. Because bacteria harbor sensory systems to detect the extracellular concentration of phosphate which controls their virulence, we tested whether local phosphate administration in the form of polyphosphate could attenuate pathogen virulence and prevent leak without affecting bacterial growth...
February 3, 2017: Annals of Surgery
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