keyword
MENU ▼
Read by QxMD icon Read
search

Microdialysis

keyword
https://www.readbyqxmd.com/read/28809433/pharmacokinetic-and-ocular-microdialysis-study-of-oral-ginkgo-biloba-extract-in-rabbits-by-uplc-ms-ms-determination
#1
Shuya Wang, Ding Li, Jiaxin Pi, Wen Li, Bing Zhang, Dongli Qi, Nan Li, Pan Guo, Zhidong Liu
OBJECTIVES: The purpose of this work was to determine and investigate the absorption of ginkgo terpenoids (GT) in plasma and aqueous humour after oral administration of ginkgo biloba extract (GBE) by UPLC-MS/MS method. METHODS: The UPLC-MS/MS determination of GT employed the multiple reaction monitoring mode using an electrospray negative ionization. The rabbits were orally administered the suspension of GBE at a dose of 500 mg/kg. Serial plasma and dialysate samples were collected at the corresponding time and then analysed by UPLC-MS/MS...
August 15, 2017: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/28783595/surfactants-enhance-recovery-of-poorly-soluble-drugs-during-microdialysis-sampling-implications-for-in-vitro-dissolution-permeation-studies
#2
Sebastian Koplin, Mont Kumpugdee-Vollrath, Annette Bauer-Brandl, Martin Brandl
Aim of this project was to investigate the applicability of a recently developed in vitro microdialysis-sampling approach in connection with a dissolution-/permeation (D/P) system, especially the impact of surfactants within the perfusion fluid. The D/P-system is based on side-by-side chambers, separated by a barrier that simulates the intestinal barrier. Here, in contrast to conventional D/P-systems, the dissolution of the drug (donor chamber concentration) is followed by microdialysis sampling. This approach appears promising, because it is expected not to disturb the dynamic interplay between drug-dissolution (-release) and drug permeation...
July 26, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28782252/cyclic-amp-dependent-post-translational-modification-of-neuronal-nitric-oxide-synthase-neuroprotects-penile-erection-in-rats
#3
Serkan Karakus, Biljana Musicki, Justin D La Favor, Arthur L Burnett
OBJECTIVES: To evaluate nNOS phosphorylation, nNOS uncoupling, and oxidative stress in the penis and major pelvic ganglia (MPG), before and after the administration of the cAMP-dependent protein kinase A (PKA) agonist colforsin in a rat model of bilateral cavernous nerve injury (BCNI) which mimics nerve injury following prostatectomy. MATERIALS AND METHODS: Adult male Sprague-Dawley rats were divided into BCNI and sham groups. Each group included 2 subgroups: vehicle and colforsin (0...
August 7, 2017: BJU International
https://www.readbyqxmd.com/read/28780872/oxazepam-dopamine-conjugates-increase-dopamine-delivery-into-striatum-of-intact-rats
#4
Tommaso Cassano, Antonio Lopalco, Modesto de Candia, Valentino Laquintana, Angela Lopedota, Annalisa Cutrignelli, Mara Perrone, Rosa M Iacobazzi, Gaurav Bedse, Massimo Franco, Nunzio Denora, Cosimo D Altomare
The neurotransmitter dopamine (DA) was covalently linked to oxazepam (OXA), a well-known positive allosteric modulator of γ-aminobutyric acid type-A (GABAA) receptor, through a carbamate linkage (4) or a succinic spacer (6). These conjugates were synthesized with the aim of improving the delivery of DA into the brain and enhancing GABAergic transmission, which may be useful for the long-term treatment of Parkinson disease (PD). Structure-based permeability properties, in vitro stability and blood-brain barrier (BBB) permeability studies led to identify the OXA-DA carbamate conjugate 4a as the compound better combining sufficient stability and ability to cross BBB...
August 5, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28762127/microdialysis-as-an-important-technique-in-systems-pharmacology-a-historical-and-methodological-review
#5
Margareta Hammarlund-Udenaes
Microdialysis has contributed with very important knowledge to the understanding of target-specific concentrations and their relationship to pharmacodynamic effects from a systems pharmacology perspective, aiding in the global understanding of drug effects. This review focuses on the historical development of microdialysis as a method to quantify the pharmacologically very important unbound tissue concentrations and of recent findings relating to modeling microdialysis data to extrapolate from rodents to humans, understanding distribution of drugs in different tissues and disease conditions...
July 31, 2017: AAPS Journal
https://www.readbyqxmd.com/read/28757050/electroencephalographic-cognitive-and-neurochemical-effects-of-ly3130481-cerc-611-a-selective-antagonist-of-tarp-%C3%AE-8-associated-ampa-receptors
#6
Jeffrey M Witkin, Jennifer Li, Gary Gilmour, Stephen N Mitchell, Guy Carter, Scott D Gleason, Wesley F Seidel, Brian J Eastwood, Andrew McCarthy, Warren J Porter, Jon Reel, Kevin M Gardinier, Akihiko S Kato, Keith A Wafford
6-[(1S)-1-[1-[5-(2-hydroxyethoxy)-2-pyridyl]pyrazol-3-yl]ethyl]-3H-1,3-benzothiazol-2-one (LY3130481 or CERC-611) is a selective antagonist of AMPA receptors containing transmembrane AMPA receptor regulatory protein (TARP) γ-8. This molecule has been characterized as a potent and efficacious anticonvulsant in an array of acute and chronic epilepsy models in rodents. The present set of experiments was designed to assess the effects of LY3130481 on the electroencephelogram (EEG), cognitive function, and neurochemical outflow...
July 27, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28743822/bronchial-microdialysis-monitoring-of-inflammatory-response-in-open-abdominal-aortic-aneurysm-repair-an-observational-study
#7
Stig S Tyvold, Torbjørn Dahl, Stein Dragsund, Sigurd Gunnes, Oddveig Lyng, Jan K Damås, Petter Aadahl, Erik Solligård
Aortic surgery results in ischemia-reperfusion injury that induces an inflammatory response and frequent complications. The magnitude of the inflammatory response in blood and bronchi may be associated with the risk of immediate complications. The purpose of the study was to evaluate bronchial microdialysis as a continuous monitoring of cytokines in bronchial epithelial lining fluid (ELF) and to determine whether bronchial ELF cytokine levels reflect the ischemia-reperfusion injury and risk for complications during open abdominal aortic aneurysm (AAA) repair...
July 2017: Physiological Reports
https://www.readbyqxmd.com/read/28740480/cerebrospinal-fluid-and-microdialysis-cytokines-in-severe-traumatic-brain-injury-a-scoping-systematic-review
#8
REVIEW
Frederick A Zeiler, Eric Peter Thelin, Marek Czosnyka, Peter J Hutchinson, David K Menon, Adel Helmy
OBJECTIVE: To perform two scoping systematic reviews of the literature on cytokine measurement in: 1. cerebral microdialysis (CMD) and 2. cerebrospinal fluid (CSF) in severe traumatic brain injury (TBI) patients. METHODS: Two separate systematic reviews were conducted: one for CMD cytokines and the second for CSF cytokines. Both were conducted in severe TBI (sTBI) patients only. DATA SOURCES: Articles from MEDLINE, BIOSIS, EMBASE, Global Health, Scopus, Cochrane Library (inception to October 2016), reference lists of relevant articles, and gray literature were searched...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28740479/non-ischemic-cerebral-energy-dysfunction-at-the-early-brain-injury-phase-following-aneurysmal-subarachnoid-hemorrhage
#9
Laurent Carteron, Camille Patet, Daria Solari, Mahmoud Messerer, Roy T Daniel, Philippe Eckert, Reto Meuli, Mauro Oddo
BACKGROUND: The pathophysiology of early brain injury following aneurysmal subarachnoid hemorrhage (SAH) is still not completely understood. OBJECTIVE: Using brain perfusion CT (PCT) and cerebral microdialysis (CMD), we examined whether non-ischemic cerebral energy dysfunction may be a pathogenic determinant of EBI. METHODS: A total of 21 PCTs were performed (a median of 41 h from ictus onset) among a cohort of 18 comatose mechanically ventilated SAH patients (mean age 58 years, median admission WFNS score 4) who underwent CMD and brain tissue PO2 (PbtO2) monitoring...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28737835/pdms-glass-hybrid-device-with-a-reusable-carbon-electrode-for-on-line-monitoring-of-catecholamines-using-microdialysis-sampling-coupled-to-microchip-electrophoresis-with-electrochemical-detection
#10
Rachel A Saylor, Susan M Lunte
On-line separations-based sensors employing microdialysis (MD) coupled to microchip electrophoresis (ME) enable the continuous monitoring of multiple analytes simultaneously. Electrochemical detection (EC) is especially amenable to on-animal systems employing MD-ME due to its ease of miniaturization. However, one of the difficulties in fabricating MD-ME-EC systems is incorporating carbon working electrodes into the device. In this paper, a novel fabrication procedure is described for the production of a PDMS/glass hybrid device that is capable of integrating hydrodynamic microdialysis flow with ME-EC using a flow-gated interface and a pyrolyzed photoresist carbon electrode...
July 24, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28733841/analgosedation-of-adult-patients-with-elevated-intracranial-pressure-survey-of-current-clinical-practice-in-austria
#11
Guenther Herzer, Claudia Mirth, Udo M Illievich, Wolfgang G Voelckel, Helmut Trimmel
BACKGROUND: Analgesia and sedation are key items in intensive care. Recently published S3 guidelines specifically address treatment of patients with elevated intracranial pressure. METHODS: The Austrian Society of Anesthesiology, Resuscitation and Intensive Care Medicine carried out an online survey of neurointensive care units in Austria in order to evaluate the current state of practice in the areas of analgosedation and delirium management in this high-risk patient group...
July 21, 2017: Wiener Klinische Wochenschrift
https://www.readbyqxmd.com/read/28732549/intraperitoneal-lactate-pyruvate-ratio-and-the-level-of-glucose-and-glycerol-concentration-differ-between-patients-surgically-treated-for-upper-and-lower-perforations-of-the-gastrointestinal-tract-a-pilot-study
#12
Jonas E Sabroe, Anne R Axelsen, Mark B Ellebæk, Bjarne Dahler-Eriksen, Niels Qvist
BACKGROUND: Secondary peritonitis is a condition associated with high morbidity and mortality. Continuous postoperative monitoring of patients to ensure timely intervention to treat complications without delay is important for survival and outcome. We aimed to (1) investigate potential differences in postoperative intraperitoneal biomarker levels between patients with upper and lower gastrointestinal tract lesion, and (2) compare postoperative biomarker levels between complicated and uncomplicated patients...
July 21, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28729901/aptamer-functionalized-neural-recording-electrodes-for-the-direct-measurement-of-cocaine-in-vivo
#13
I Mitch Taylor, Zhanhong Du, Emma T Bigelow, James R Eles, Anthony R Horner, Kasey A Catt, Stephen G Weber, Brian G Jamieson, X Tracy Cui
Cocaine is a highly addictive psychostimulant that acts through competitive inhibition of the dopamine transporter. In order to fully understand the region specific neuropathology of cocaine abuse and addiction, it is unequivocally necessary to develop cocaine sensing technology capable of directly measuring real-time cocaine transient events local to different brain regions throughout the pharmacokinetic time course of exposure. We have developed an electrochemical aptamer-based in vivo cocaine sensor on a silicon based neural recording probe platform capable of directly measuring cocaine from discrete brain locations using square wave voltammetry (SWV)...
April 7, 2017: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28729391/edward-f-adolph-distinguished-lecture-skin-deep-insights-into-vascular-aging
#14
W Larry Kenney
The skin is an accessible model circulation for studying vascular function and dysfunction across the lifespan. Age-related changes, as well as those associated with disease progression, often appear first in the cutaneous circulation. Further, impaired vascular signaling and attendant endothelial dysfunction -- one of the earliest indicators of cardiovascular pathogenesis -- occurs in a similar fashion across multiple tissue beds throughout the body including the skin. Because microvascular dysfunction is a better predictor of long term outcomes and adverse cardiovascular events than is large vessel disease, understanding age-associated changes in the control of the human cutaneous microcirculation is important...
July 20, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28729221/sensitivity-to-cocaine-in-adult-mice-is-due-to-interplay-between-genetic-makeup-early-environment-and-later-experience
#15
Matteo Di Segni, Diego Andolina, Alessandra Coassin, Alessandra Accoto, Alessandra Luchetti, Tiziana Pascucci, Carla Luzi, Anna Rita Lizzi, Francesca R D'Amato, Rossella Ventura
Although early aversive postnatal events are known to increase the risk to develop psychiatric disorders later in life, rarely they determine alone the nature and outcome of the psychopathology, indicating that interaction with genetic factors is crucial for expression of psychopathologies in adulthood. Moreover, it has been suggested that early life experiences could have negative consequences or confer adaptive value in different individuals. Here we suggest that resilience or vulnerability to adult cocaine sensitivity depends on a "triple interaction" between genetic makeup x early environment x later experience...
July 17, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28727685/erbb4-signaling-in-dopaminergic-axonal-projections-increases-extracellular-dopamine-levels-and-regulates-spatial-working-memory-behaviors
#16
M Skirzewski, I Karavanova, A Shamir, L Erben, J Garcia-Olivares, J H Shin, D Vullhorst, V A Alvarez, S G Amara, A Buonanno
Genetic variants of Neuregulin 1 (NRG1) and its neuronal tyrosine kinase receptor ErbB4 are associated with risk for schizophrenia, a neurodevelopmental disorder characterized by excitatory/inhibitory imbalance and dopamine (DA) dysfunction. To date, most ErbB4 studies have focused on GABAergic interneurons in the hippocampus and neocortex, particularly fast-spiking parvalbumin-positive (PV+) basket cells. However, NRG has also been shown to modulate DA levels, suggesting a role for ErbB4 signaling in dopaminergic neuron function...
July 20, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28723199/rational-design-of-a-stimuli-responsive-polymer-electrode-interface-coupled-with-in-vivo-microdialysis-for-measurement-of-sialic-acid-in-live-mouse-brain-in-alzheimer-s-disease
#17
Shushu Ding, Sumei Cao, Yingzi Liu, Ying Lian, Anwei Zhu, Guoyue Shi
Sensitive and selective monitoring of sialic acid (SA) in cerebral nervous system is of great importance for studying the role that SA plays in the pathological process of Alzheimer's disease (AD). In this work, we first reported an electrochemical biosensor based on a novel stimuli-responsive copolymer for selective and sensitive detection of SA in mouse brain. Notably, through synergetic hydrogen-bonding interactions, the copolymer could translate the recognition of SA into their conformational transition and wettability switch, which facilitated the access and enrichment of redox labels and targets to the electrode surface, thus significantly improving the detection sensitivity with the detection limit down to 0...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28720903/pharmacological-modulation-of-5-ht2c-receptor-activity-produces-bidirectional-changes-in-locomotor-activity-responding-for-a-conditioned-reinforcer-and-mesolimbic-da-release-in-c57bl-6-mice
#18
Caleb J Browne, Xiaodong Ji, Guy A Higgins, Paul J Fletcher, Colin Harvey-Lewis
Converging lines of behavioral, electrophysiological, and biochemical evidence suggest that 5-HT2C receptor signaling may bidirectionally influence reward-related behavior through an interaction with the mesolimbic dopamine (DA) system. Here we directly test this hypothesis by examining how modulating 5-HT2C receptor activity affects DA-dependent behaviors and relate these effects to changes in nucleus accumbens (NAc) DA release. In C57BL/6 mice, locomotor activity and responding for a conditioned reinforcer (CRf), a measure of incentive motivation, were examined following treatment with three 5-HT2C receptor ligands: the agonist CP809101 (0...
June 13, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28718955/an-electrochemiluminescent-method-for-glutamate-measurement-in-small-microdialysate-samples-in-asphyxiated-young-rats
#19
Jorge Ortega-Ibarra, Silvia López-Pérez, Alberto Morales-Villagrán
Glutamate (Glu) quantification has been performed by a combination of intracerebral microdialysis through which the samples are obtained and analyzed by high performance liquid chromatography (HPLC); its measurement requires a large expenditure of time (15-30 min per sample) and special training. Therefore, an alternative method is presented here, based on the electrochemiluminescence produced by the use of an enzymatic reactor, containing glutamate-oxidase, mixed and incubated with microdialysate from dorsal striatum (DS) and prefrontal cortex (PFC) of young rats asphyxiated during the neonatal period, under a global asphyxia model in order to test this method...
July 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28709820/sex-dependent-difference-in-the-relationship-between-adipose-tissue-cholesterol-efflux-and-estradiol-concentrations-in-young-healthy-humans
#20
REVIEW
Fatima Iqbal, William J Durham, Ayyash Melhem, Saleem Raslan, Tony T Tran, Traver J Wright, Rabia Asghar, Ken Fujise, Elena Volpi, Labros Sidossis, Nicola Abate, Melinda Sheffield-Moore, Demidmaa Tuvdendorj
BACKGROUND: Impaired adipose tissue function and lower levels of high density lipoprotein cholesterol (HDL-C) have been implicated in the development of vascular dementia, and metabolic diseases such as hypertension, atherosclerosis, type 2 diabetes (T2D) and metabolic syndrome. Interestingly, both the substrate fluxes in adipose tissue and HDL-C concentration differ between men and women. Moreover, adipose tissue cholesterol efflux has been implicated in modulation of HDL-C levels. Thus, we aimed to determine if the association between serum estradiol levels and adipose tissue cholesterol efflux is sex-dependent...
July 11, 2017: International Journal of Developmental Neuroscience
keyword
keyword
1797
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"