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https://www.readbyqxmd.com/read/29152797/oxidative-stress-does-not-influence-local-sweat-rate-during-high-intensity-exercise
#1
Robert D Meade, Naoto Fujii, Martin P Poirier, Pierre Boulay, Ronald J Sigal, Glen P Kenny
Nitric oxide (NO)-dependent sweating is diminished during high but not moderate intensity exercise. We evaluated whether this impairment stems from increased oxidative stress during high intensity exercise. On two separate days, 11 young (24 ± 4 years) males cycled in the heat (35°C) at a moderate (500 W; 52 ± 6%VO2peak ) or high (700 W; 71 ± 5%VO2peak ) rate of metabolic heat production. Each session included two 30-min exercise bouts separated by a 20-min recovery. Local sweat rate was monitored at four forearm skin sites continuously perfused via intradermal microdialysis with: (1) lactated Ringer's solution (Control), (2) 10 mm ascorbate (Ascorbate; non-selective antioxidant), (3) 10 mm N(G) -nitro-L -arginine methyl ester (L-NAME; NO synthase inhibitor), or (4) 10 mm Ascorbate + 10 mm L-NAME (Ascorbate + L-NAME)...
November 19, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29145840/blockade-of-nicotine-sensitization-by-methanol-extracts-of-glycyrrhizae-radix-mediated-via-antagonism-of-accumbal-oxidative-stress
#2
Zheng Lin Zhao, Sang Chan Kim, Hong Feng Liu, Yi Yan Wu, Li Bo Li, Yu Hua Wang, Yu Jiao, Yu Fan, Chul Won Lee, Bong Hyeo Lee, Il Je Cho, Chae Ha Yang, Rong Jie Zhao
BACKGROUND: We previously reported that a methanol extract of Glycyrrhizae radix (MEGR) blocked methamphetamine-induced locomotor sensitization and conditioned place preference in rats. In the present study, the effects of MEGR on repeated nicotine-induced locomotor sensitization and enhanced extracellular dopamine (DA) release in the nucleus accumbens (Nacc) were evaluated. METHODS: Male Sprague-Dawley rats received repeated administrations of nicotine (0.4 mg/kg, subcutaneous) or saline twice a day for 7 d and were challenged with nicotine 4 d after the last daily dosing...
November 16, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/29134560/neurochemical-and-neurotoxic-effects-of-mdma-ecstasy-and-caffeine-after-chronic-combined-administration-in-mice
#3
Anna Maria Górska, Katarzyna Kamińska, Agnieszka Wawrzczak-Bargieła, Giulia Costa, Micaela Morelli, Ryszard Przewłocki, Grzegorz Kreiner, Krystyna Gołembiowska
MDMA (3,4-methylenedioxymethamphetamine) is a psychostimulant popular as a recreational drug because of its effect on mood and social interactions. MDMA acts at dopamine (DA) transporter (DAT) and serotonin (5-HT) transporter (SERT) and is known to induce damage of dopamine and serotonin neurons. MDMA is often ingested with caffeine. Caffeine as a non-selective adenosine A1/A2A receptor antagonist affects dopaminergic and serotonergic transmissions. The aim of the present study was to determine the changes in DA and 5-HT release in the mouse striatum induced by MDMA and caffeine after their chronic administration...
November 13, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/29127598/gaba-uptake-inhibition-reduces-in-vivo-extraction-fraction-in-the-ventral-tegmental-area-of-long-evans-rats-measured-by-quantitative-microdialysis-under-transient-conditions
#4
Shannon L Zandy, Rueben A Gonzales
Inhibitory signaling in the ventral tegmental area (VTA) is involved in the mechanism of action for many drugs of abuse. Although drugs of abuse have been shown to alter extracellular γ-aminobutyric acid (GABA) concentration in the VTA, knowledge on how uptake mechanisms are regulated in vivo is limited. Quantitative (no-net-flux) microdialysis is commonly used to examine the extracellular concentration and clearance of monoamine neurotransmitters, however it is unclear whether this method is sensitive to changes in clearance for amino acid neurotransmitters such as GABA...
November 10, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/29124255/a-microdialysis-based-analytical-system-for-dynamic-monitoring-of-arsenic-transformation-under-microbial-activity
#5
Keng-Chang Hsu, Jing-Ru Hsieh, Ya-Ching Chen, Pi-Fu Hsu, Chih-Chang Hung, Yeou-Lih Huang
In this study, a microdialysis (MD) technique was combined with high-performance liquid chromatography/inductively coupled plasma mass spectrometry (HPLC-ICP-MS) for continuous monitoring of the dynamic variations of arsenic species in a microbe-inoculated culture broth. After optimizing the analytical system, retrodialysis was applied to assess the probe recovery and analytical performance of the proposed method. The mean probe recoveries of four arsenic species were in the range from 57.0 to 81.8%. The limit of detection (LOD) for arsenic was in the range of 0...
November 10, 2017: Analyst
https://www.readbyqxmd.com/read/29118105/neuropeptide-s-activates-paraventricular-oxytocin-neurons-to-induce-anxiolysis
#6
Thomas Grund, Stephanie Goyon, Yuting Li, Marina Eliava, Haikun Liu, Alexandre Charlet, Valery Grinevich, Inga D Neumann
Neuropeptides, such as neuropeptide S (NPS) and oxytocin (OXT) represent potential options for the treatment of anxiety disorders due to their potent anxiolytic profile. In this study, we aimed to reveal the mechanisms underlying the behavioral action of NPS, and present a chain of evidence that the effects of NPS within the hypothalamic paraventricular nucleus (PVN) are mediated via actions on local OXT neurons in male Wistar rats. First, retrograde studies identified NPS fibers originating in the brainstem locus coeruleus and projecting to the PVN...
November 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29117995/the-role-of-mitochondria-derived-reactive-oxygen-species-in-microvascular-dysfunction-in-chronic-kidney-disease
#7
Danielle L Kirkman, Bryce J Muth, Meghan G Ramick, Raymond R Townsend, David G Edwards
Cardiovascular disease is the leading cause of mortality in Chronic Kidney Disease (CKD). Mitochondrial dysfunction secondary to CKD is a potential source of oxidative stress that may impair vascular function. This study sought to determine if mitochondria derived reactive oxygen species contribute to microvascular dysfunction in Stage 3-5 CKD. Cutaneous vasodilation in response to local heating was assessed in 20 CKD patients (60±13 years; eGFR 46±13ml/kg/1.73m2) and eleven matched healthy participants (58±2 years; eGFR>90ml/kg/1...
November 8, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29110773/cerebrospinal-fluid-and-brain-extracellular-fluid-in-severe-brain-trauma
#8
Raimund Helbok, Ronny Beer
Traumatic brain injury is a major cause of morbidity and mortality worldwide. Pathophysiologic mechanisms of secondary brain injury are complex and still not fully understood. Cerebrospinal fluid deserves attention to detect infectious complications and to identify biomarkers of disease severity and impending secondary brain injury. As an adjunct, cerebral microdialysis (CMD) allows online measurements of biomarkers derived directly from brain extracellular fluid. We critically review relevant literature related to infectious complications detectable in the cerebrospinal fluid in trauma patients...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/29109162/comparative-assessment-of-tedizolid-pharmacokinetics-and-tissue-penetration-between-diabetic-patients-with-wound-infections-and-healthy-volunteers-via-in-vivo-microdialysis
#9
Sean M Stainton, Marguerite L Monogue, Arlinda Baummer-Carr, Ashley K Shepard, James F Nugent, Joseph L Kuti, David P Nicolau
Herein, we present pharmacokinetic and tissue penetration data for oral tedizolid in hospitalized patients with diabetic foot infections (DFI) compared with healthy volunteers. Participants received oral tedizolid phosphate 200mg every 24 hours for 3 doses to achieve steady-state. A microdialysis catheter was inserted into the subcutaneous tissue near the margin of the wound for patients or into thigh tissue of volunteers. Following the 3(rd) dose, 12 blood and 14 dialysate fluid samples were collected over 24 hours to characterize tedizolid concentrations in plasma and interstitial extracellular fluid of soft tissue...
November 6, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29106979/development-of-a-population-pharmacokinetic-model-to-predict-brain-distribution-and-dopamine-d2-receptor-occupancy-of-raclopride-in-non-anesthetized-rat
#10
Yin Cheong Wong, Trayana Ilkova, Rob C van Wijk, Robin Hartman, Elizabeth C M de Lange
BACKGROUND: Raclopride is a selective antagonist of the dopamine D2 receptor. It is one of the most frequently used in vivo D2 tracers (at low doses) for assessing drug-induced receptor occupancy (RO) in animals and humans. It is also commonly used as a pharmacological blocker (at high doses) to occupy the available D2 receptors and antagonize the action of dopamine or drugs on D2 in preclinical studies. The aims of this study were to comprehensively evaluate its pharmacokinetic (PK) profiles in different brain compartments and to establish a PK-RO model that could predict the brain distribution and RO of raclopride in the freely moving rat using a LC-MS based approach...
November 4, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29105799/-microdialysis-as-a-tool-to-determine-the-local-tissue-concentration-of-dicloxacillin-in-man
#11
K K Hansen, F Nielsen, T B Stage, U Jørgensen, O Skov, L E Rasmussen
AIM: The most common pathogen in Denmark, to cause postoperative infections, is Staphylococcus (S.) aureus (1). Despite using prophylactic antibiotics, infections are still seen. Whether the tissue concentration is above the minimal inhibitory concentration (MIC) for the pathogen is unknown. Thus, the concentration of dicloxacillin in muscle and adipose tissue was measured after intravenous administration, in healthy men. METHODS: MIC for dicloxacillin against S...
November 5, 2017: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/29098821/-in-vivo-transdermal-penetration-enhancing-activity-of-essential-oil-from-zanthoxyli-pericarpium-by-using-microdialysis-technique
#12
Yi Lan, Lin Yang, Da-Yong Shi, Ying-Xin Wang, Xue-Ping Wu, Xuan Xie, Qing Wu
The aim of this paper is to investigate the topical pharmacodynamics behavior of different lipophilic model drugs after treatment with essential oil from Zanthoxyli Pericarpium by using the cutaneous microdialysis technique, and then evaluate its in vivo transdermal penetration enhancing properties. Two traditional Chinese medicine active components, namely tetramethylpyrazine and puerarin, were chosen as lipophilic and hydrophilic model drugs, respectively. Firstly, the concentration difference method was employed to measure the in vitro recovery rate and loss of the microdialysis probe, and the in vivo recoveries of two model drugs were determined by using the retrodialysis method...
July 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29096171/considerations-for-effect-site-pharmacokinetics-to-estimate-drug-exposure-concentrations-of-antibiotics-in-the-lung
#13
REVIEW
Keith A Rodvold, William W Hope, Sara E Boyd
Bronchoalveolar lavage (BAL) and microdialysis have become the most reliable and relevant methods for measuring lung concentrations of antibiotics, with the majority of BAL studies involving either healthy adult subjects or patients undergoing diagnostic bronchoscopy. Emphasis on the amount of drug that reaches the site of infection is increasingly recognized as necessary to determine whether a dose selection will translate to good clinical outcomes in the treatment of patients with pneumonia. Observed concentrations and/or parameters of exposure (e...
October 30, 2017: Current Opinion in Pharmacology
https://www.readbyqxmd.com/read/29096134/modification-of-the-natural-progression-of-epileptogenesis-by-means-of-biperiden-in-the-pilocarpine-model-of-epilepsy
#14
Simone Bittencourt, Enéas Ferrazoli, Maria Fernanda Valente, Simone Romariz, Nilma R L L Janisset, Carlos Eduardo Macedo, Bruno de Brito Antonio, Vanessa Barros, Mayara Mundim, Marimélia Porcionatto, Mayra Consuelo Aarão, Maísa Ferreira Miranda, Antônio Márcio Rodrigues, Antônio-Carlos Guimarães de Almeida, Beatriz M Longo, Luiz E Mello
Brain injuries are often associated with the later development of epilepsy. Evidence suggests that morphological and functional changes occur in the remaining neural tissue during a silent (or latent) period in which no seizures are expressed. It is believed that this silent (reorganization) period may provide a therapeutic window for modifying the natural history of disease progression. Here we provide evidence that biperiden, a muscarinic anticholinergic agent, is able to alter disease progression in an animal model of epilepsy...
October 29, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/29093476/in-vivo-neurochemical-measurements-in-cerebral-tissues-using-a-droplet-based-monitoring-system
#15
Guillaume Petit-Pierre, Philippe Colin, Estelle Laurer, Julien Déglon, Arnaud Bertsch, Aurélien Thomas, Bernard L Schneider, Philippe Renaud
Direct collection of extracellular fluid (ECF) plays a central role in the monitoring of neurological disorders. Current approaches using microdialysis catheters are however drastically limited in term of temporal resolution. Here we show a functional in vivo validation of a droplet collection system included at the tip of a neural probe. The system comprises an advanced droplet formation mechanism which enables the collection of neurochemicals present in the brain ECF at high-temporal resolution. The probe was implanted in a rat brain and could successfully collect fluid samples organized in a train of droplets...
November 1, 2017: Nature Communications
https://www.readbyqxmd.com/read/29093350/in-vivo-microdialysis-for-dynamic-monitoring-of-the-effectiveness-of-nano-liposomes-as-vehicles-for-topical-psoralen-application
#16
Hongyu Zhang, Kai Zhang, Zhe Li, Jihui Zhao, Yongtai Zhang, Nianping Feng
In this study, the skin permeation of liposomes containing psoralen was investigated by in vivo skin microdialysis. Psoralen-loaded nano-sized liposomes were prepared with a mean size of 117.5 nm and a polydispersity index of 0.21, indicating the uniform dispersion of phosphatidylcholine vesicles in the liposomal solution. Based on in vivo microdialysis experiments, the drug concentration in local deep skin of rat increased rapidly and reached a peak concentration (Cmax) of 319.35±23.72 µg/mL at 180 min, and decreased slowly thereafter...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/29091212/penetration-of-linezolid-into-synovial-fluid-and-muscle-tissue-after-elective-arthroscopy
#17
R Schwameis, S Syré, K Sarahrudi, A Appelt, D Marhofer, D Burau, C Kloft, M Zeitlinger
Objectives: Penetration of antibiotics into synovial fluid is crucial to combat septic arthritis efficiently. Since linezolid may be used for treatment of septic arthritis when methicillin-resistant bacterial strains are suspected, we investigated its target-site concentrations in synovial fluid. Patients and methods: Ten patients undergoing elective knee arthroscopy were included in this study. Subjects received a single dose of 600 mg of linezolid intravenously and linezolid concentrations were measured in plasma and by using microdialysis in muscle tissue and synovial fluid...
October 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29089037/revisiting-atenolol-as-a-low-passive-permeability-marker
#18
Xiaomei Chen, Tim Slättengren, Elizabeth C M de Lange, David E Smith, Margareta Hammarlund-Udenaes
BACKGROUND: Atenolol, a hydrophilic beta blocker, has been used as a model drug for studying passive permeability of biological membranes such as the blood-brain barrier (BBB) and the intestinal epithelium. However, the extent of S-atenolol (the active enantiomer) distribution in brain has never been evaluated, at equilibrium, to confirm that no transporters are involved in its transport at the BBB. METHODS: To assess whether S-atenolol, in fact, depicts the characteristics of a low passive permeable drug at the BBB, a microdialysis study was performed in rats to monitor the unbound concentrations of S-atenolol in brain extracellular fluid (ECF) and plasma during and after intravenous infusion...
October 31, 2017: Fluids and Barriers of the CNS
https://www.readbyqxmd.com/read/29084196/multi-modality-neuromonitoring-in-severe-pediatric-traumatic-brain-injury-monitoring-pediatric-tbi
#19
REVIEW
Adam M H Young, Mathew R Guilfoyle, Joseph Donnelly, Peter Smielewski, Shruti Agarwal, Marek Czosnyka, Peter J Hutchinson
Each year, the annual hospitalization rates of traumatic brain injury (TBI) in children in the US are 57.7 per 100 K less than 5 years of age and 23.1 per 100 K in the 5-14 year age group. Despite this, little is known about the pathophysiology of TBI in children and how to manage it most effectively. Historically, TBI management has been guided by clinical examination. This has been assisted progressively by clinical imaging, intracranial pressure (ICP) monitoring and finally software that can calculate optimal brain physiology...
October 30, 2017: Pediatric Research
https://www.readbyqxmd.com/read/29082595/cutaneous-reactive-hyperaemia-is-unaltered-by-dietary-nitrate-supplementation-in-healthy-humans
#20
Brett J Wong, Jeremy T Keen, Erica L Levitt
The purpose of this study was to determine whether nitrate supplementation augments cutaneous reactive hyperaemia. Seven participants were tested pre- and postnitrate supplementation (25 ml beetroot juice); participants consumed one shot per day for 3 days. Participants were instrumented with two microdialysis fibres: control (Ringer's solution) and NO synthase inhibition (20 mM L-NAME). Skin blood flow was measured via laser-Doppler flowmetry (LDF). A blood pressure cuff was placed on the experimental arm and inflated to 250 mmHg for 5 mins to occlude arterial inflow...
October 29, 2017: Clinical Physiology and Functional Imaging
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