keyword
MENU ▼
Read by QxMD icon Read
search

Microdialysis

keyword
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
#1
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
#2
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
#3
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
#4
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
https://www.readbyqxmd.com/read/28692315/biodegradable-nanoparticles-for-improved-kidney-bioavailability-of-rhein-preparation-characterization-plasma-and-kidney-pharmacokinetics
#5
Yinghui Wei, Xiaoting Luo, Jiani Guan, Jianping Ma, Yicong Zhong, Jingwen Luo, Fanzhu Li
The aim of this work is to develop biodegradable nanoparticles for improved kidney bioavailability of rhein (RH). RH-loaded nanoparticles were prepared using an emulsification solvent evaporation method and fully characterized by several techniques. Microdialysis was used to determine the concentrations of unbound RH in the kidney with simultaneous collecting blood samples (via femoral artery) to assess plasma levels of RH. Optimized nanoparticles were small, with a mean particle size of 132.6±5.95nm, and homogeneously dispersed...
July 10, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/28687505/xiaochaihutang-attenuates-depressive-anxiety-like-behaviors-of-social-isolation-reared-mice-by-regulating-monoaminergic-system-neurogenesis-and-bdnf-expression
#6
Jie Ma, Fang Wang, Jingyu Yang, Yingxu Dong, Guangyue Su, Kuo Zhang, Xing Pan, Ping Ma, Tingshuo Zhou, Chunfu Wu
ETHNOPHARMACOLOGICAL RELEVANCE: Xiaochaihutang (XCHT), as a classical herbal formula for the treatment of "Shaoyang syndrome" has been demonstrated to exert an antidepressant effect in multiple animal models of depression as shown in our previous studies. However, the effects of XCHT on social isolation (SI)-reared mice have not been investigated. This study aims to explore the effects of XCHT on depressive/anxiety-like behaviors of SI-reared mice, and its implicated mechanisms, including alterations in the monoaminergic system, neurogenesis and neurotrophin expression...
July 5, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28685616/cerebral-serotonin-release-correlates-with-11-c-az10419369-pet-measures-of-5-ht1b-receptor-binding-in-the-pig-brain
#7
Louise M Jørgensen, Pia Weikop, Claus Svarer, Ling Feng, Sune H Keller, Gitte M Knudsen
Positron emission tomography (PET) can, when used with appropriate radioligands, non-invasively capture temporal and spatial information about acute changes in brain neurotransmitter systems. We here evaluate the 5-HT1B receptor partial agonist PET radioligand, [(11)C]AZ10419369, for its sensitivity to detect changes in endogenous cerebral serotonin levels, as induced by different pharmacological challenges. To enable a direct translation of PET imaging data to changes in brain serotonin levels, we compared the [(11)C]AZ10419369 PET signal in the pig brain to simultaneous measurements of extracellular serotonin levels with microdialysis after various acute interventions (saline, escitalopram, fenfluramine)...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28674514/aspects-on-the-physiological-and-biochemical-foundations-of-neurocritical-care
#8
REVIEW
Carl-Henrik Nordström, Lars-Owe Koskinen, Magnus Olivecrona
Neurocritical care (NCC) is a branch of intensive care medicine characterized by specific physiological and biochemical monitoring techniques necessary for identifying cerebral adverse events and for evaluating specific therapies. Information is primarily obtained from physiological variables related to intracranial pressure (ICP) and cerebral blood flow (CBF) and from physiological and biochemical variables related to cerebral energy metabolism. Non-surgical therapies developed for treating increased ICP are based on knowledge regarding transport of water across the intact and injured blood-brain barrier (BBB) and the regulation of CBF...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28674483/hypotensive-response-to-angiotensin-ii-type-2-receptor-stimulation-in-the-rostral-ventrolateral-medulla-requires-functional-gaba-a-receptors
#9
Laura Légat, Sofie Brouwers, Ilse J Smolders, Alain G Dupont
Objectives: Angiotensin II, glutamate and gamma-aminobutyric acid (GABA) interact within the rostral ventrolateral medulla (RVLM) and the paraventricular nucleus (PVN) modulating the central regulation of blood pressure and sympathetic tone. Our aim was to assess the effects of local angiotensin II type 2 receptor stimulation within the RVLM and the PVN on neurotransmitter concentrations and mean arterial pressure (MAP). Methods:In vivo microdialysis was used for measurement of extracellular glutamate and GABA levels and for local infusion of the angiotensin II type 2 receptor agonist Compound 21 in the RVLM and the PVN of conscious normotensive Wistar rats...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28669033/monitoring-the-brain-after-cardiac-arrest-a-new-era
#10
REVIEW
Niraj Sinha, Sam Parnia
PURPOSE OF REVIEW: Of the approximately 350,000 out-of-hospital, and 750,000 after in-hospital cardiac arrest (CA) events in the US annually approximately 5-9% and 20% respectively may achieve return of spontaneous circulation (ROSC) after attempted cardiopulmonary resuscitation (CPR). Up to 2/3 of these initial survivors may go on die in the subsequent 24-72 hours after ROSC due to a combination of (1) on-going cerebral injury, (2) myocardial dysfunction and (3) massive systemic inflammatory response...
August 2017: Current Neurology and Neuroscience Reports
https://www.readbyqxmd.com/read/28668970/achilles-tendon-rupture-healing-is-enhanced-by-intermittent-pneumatic-compression-upregulating-collagen-type-i-synthesis
#11
Md Abdul Alim, Erica Domeij-Arverud, Gunnar Nilsson, Gunnar Edman, Paul W Ackermann
PURPOSE AND HYPOTHESIS: Adjuvant intermittent pneumatic compression (IPC) during leg immobilization following Achilles tendon rupture (ATR) has been shown to reduce the risk of deep venous thrombosis. The purpose of this study was to investigate whether IPC can also promote tendon healing. METHODS: One hundred and fifty patients with surgical repair of acute ATR were post-operatively leg immobilized and prospectively randomized. Patients were allocated for 2 weeks of either adjuvant IPC treatment (n = 74) or treatment-as-usual (n = 74) in a plaster cast without IPC...
July 1, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28666704/systemic-and-tissue-specific-effects-of-aliskiren-on-the-raas-and-carbohydrate-lipid-metabolism-in-obese-patients-with-hypertension
#12
Stefan Engeli, Marcus May, Juerg Nussberger, A H Jan Danser, William P Dole, Margaret F Prescott, Marion Dahlke, Sylvie Stitah, Parasar Pal, Michael Boschmann, Jens Jordan
Aliskiren penetrates adipose and skeletal muscle in hypertensive patients with abdominal obesity and reduces renin-angiotensin-aldosterone system activity. After discontinuation, blood pressure-lowering effects are observed possibly through drug-tissue binding. We performed microdialysis evaluation of adipose tissue and skeletal muscle before and during an insulin-modified frequently sampled intravenous glucose tolerance test (IM-FSIGT). Aliskiren 300 mg (n = 8) or amlodipine 5 mg (n = 8) once daily were administered during a 12-week randomized treatment period...
June 12, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/28664332/heparin-gold-nanoparticles-for-enhanced-microdialysis-sampling
#13
Susan Giorgi-Coll, Holly Blunt-Foley, Peter J Hutchinson, Keri L H Carpenter
Cerebral microdialysis is a sampling technique which offers much potential for understanding inflammatory pathophysiology following traumatic brain injury (TBI). At present, the recovery of cytokines via microdialysis in clinical studies is not straightforward primarily due to their size, steric properties and low concentrations. Heparin and heparin-coated microspheres have previously shown promise as cytokine-binding agents for enhanced microdialysis sampling in animal models (Duo and Stenken in Anal Bioanal Chem 399(2):773-82, 2011; Anal Bioanal Chem 399(2):783-93, 2011)...
June 29, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28660730/fatty-acid-amide-hydrolase-faah-inactivation-confers-enhanced-sensitivity-to-nicotine-induced-dopamine-release-in-the-mouse-nucleus-accumbens
#14
Francisco J Pavon, Antonia Serrano, Nimish Sidhpura, Ilham Polis, David Stouffer, Fernando Rodriguez de Fonseca, Benjamin F Cravatt, Rémi Martin-Fardon, Loren H Parsons
Nicotine exerts its rewarding effects by promoting an increase in dopamine (DA) release in the nucleus accumbens (NAc), and this process is influenced by the endocannabinoid system. Fatty acid amide hydrolase (FAAH) is the main enzyme responsible for the degradation of the endocannabinoid anandamide and other non-cannabinoid N-acylethanolamines. Previous research has reported that both genetic deletion and pharmacological inhibition of FAAH enhance nicotine-induced conditioned place preference at low doses...
June 29, 2017: Addiction Biology
https://www.readbyqxmd.com/read/28660399/microdialysis-coupled-with-lc-ms-ms-for-in-vivo-neurochemical-monitoring
#15
Alexander G Zestos, Robert T Kennedy
Microdialysis is a powerful sampling technique used to monitor small molecules in vivo. Despite the many applications of microdialysis sampling, it is limited by the method of analyzing the resulting samples. An emerging technique for analysis of microdialysis samples is liquid chromatography-tandem mass spectrometry (LC-MS/MS). This technique is highly versatile, allowing multiplexed analysis of neurotransmitters, metabolites, and neuropeptides. Using LC-MS/MS for polar neurotransmitters is hampered by weak retention reverse phase LC columns...
June 28, 2017: AAPS Journal
https://www.readbyqxmd.com/read/28659770/evaluation-of-azd1446-as-a-therapeutic-in-dyt1-dystonia
#16
Chelsea N Zimmerman, Karen L Eskow Jaunarajs, Maria Meringolo, Francesca R Rizzo, Massimo Santoro, David G Standaert, Antonio Pisani
DYT1 dystonia is an early-onset, hyperkinetic movement disorder caused by a deletion in the gene TOR1A, which encodes the protein torsinA. Several lines of evidence show that in animal models of DTY1 dystonia, there is impaired basal dopamine (DA) release and enhanced acetylcholine tone. Clinically, anticholinergic drugs are the most effective pharmacological treatment for DYT1 dystonia, but the currently used agents are non-selective muscarinic antagonists and associated with side effects. We used a DYT1 ∆GAG knock-in mouse model (DYT1 KI) to investigate whether nicotine and/or a non-desensitizing nicotinic agonist, AZD1446, would increase DA output in DYT1 dystonia...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28656093/berberine-attenuates-convulsing-behavior-and-extracellular-glutamate-and-aspartate-changes-in-4-aminopyridine-treated-rats
#17
Hamid Reza Sadeghnia, Ali Reza Taji, Fatemeh Forouzanfar, Hossein Hosseinzadeh
OBJECTIVES: K+ channel blocker 4-aminopyridine (4-AP) stimulates the release of glutamate from nerve terminals and induces seizures. Berberine as a potential herbal drug exerts several pharmacological actions on the central nervous system including anxiolytic, anticonvulsant, and neuroprotective properties. The present study aimed to investigate the effect of berberine on seizure onset and time course of the extracellular levels of excitatory amino acids (EAA), glutamate and aspartate, changes produced by 4-AP in rat hippocampus...
May 2017: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/28653748/adaptive-dynamics-of-the-5-ht-systems-following-chronic-administration-of-selective-serotonin-reuptake-inhibitors-a-meta-analysis
#18
Stefan Fritze, Rainer Spanagel, Hamid R Noori
Selective serotonin reuptake inhibitors (SSRIs) are the most frequently prescribed antidepressants. However, a major concern is their delayed onset of action, which is hypothesized to be associated with the time required for serotonin (5-HT) autoreceptors to desensitize, which should be reflected by actual neurochemical changes. Numerous in vivo microdialysis studies have been published that report on 5-HT levels in different brain sites following SSRI administration. Here we performed a meta-analysis on dynamic changes of 5-HT neurotransmission during the course of chronic SSRI treatment...
June 27, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28653244/%C3%AE-hydroxybutyric-acid-ghb-pharmacokinetics-and-pharmacodynamics-semi-mechanistic-and-physiologically-relevant-pk-pd-model
#19
Rutwij A Dave, Kristin E Follman, Marilyn E Morris
An overdose of γ-hydroxybutyric acid (GHB), a drug of abuse, results in fatality caused by severe respiratory depression. In this study, a semi-mechanistic pharmacokinetic/pharmacodynamic (PK/PD) model was developed to characterize monocarboxylate transporter 1 (MCT1)-mediated transport of GHB, as well as effects of GHB on respiration frequency, for IV doses of 200, 600, and 1500 mg/kg in rats. The proposed PK/PD model for GHB consists of nonlinear metabolism of GHB in the liver, MCT1-mediated renal reabsorption with physiologically relevant concurrent fluid reabsorption, MCT1-mediated uptake into the brain, and direct effects of binding of GHB to GABAB receptors on the PD parameter, respiration frequency...
June 26, 2017: AAPS Journal
https://www.readbyqxmd.com/read/28638971/longer-duration-of-operative-time-enhances-healing-metabolites-and-improves-patient-outcome-after-achilles-tendon-rupture-surgery
#20
Simon Svedman, Olof Westin, Susanna Aufwerber, Gunnar Edman, Katarina Nilsson-Helander, Michael R Carmont, Jón Karlsson, Paul W Ackermann
PURPOSE: The relationship between the duration of operative time (DOT), healing response and patient outcome has not been previously investigated. An enhanced healing response related to DOT may potentiate repair processes, especially in hypovascular and sparsely metabolized musculoskeletal tissues such as tendons. This study aimed to investigate the association between DOT and the metabolic healing response, patient-reported outcome and the rate of post-operative complications after acute Achilles tendon injury...
June 21, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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"