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Microdialysis

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https://www.readbyqxmd.com/read/29764453/ampa-ergic-regulation-of-amyloid-%C3%AE-levels-in-an-alzheimer-s-disease-mouse-model
#1
Jane C Hettinger, Hyo Lee, Guojun Bu, David M Holtzman, John R Cirrito
BACKGROUND: Extracellular aggregation of the amyloid-β (Aβ) peptide into toxic multimers is a key event in Alzheimer's disease (AD) pathogenesis. Aβ aggregation is concentration-dependent, with higher concentrations of Aβ much more likely to form toxic species. The processes that regulate extracellular levels of Aβ therefore stand to directly affect AD pathology onset. Studies from our lab and others have demonstrated that synaptic activity is a critical regulator of Aβ production through both presynaptic and postsynaptic mechanisms...
May 15, 2018: Molecular Neurodegeneration
https://www.readbyqxmd.com/read/29760544/ischemia-reperfusion-injury-in-porcine-intestine-viability-assessment
#2
Runar J Strand-Amundsen, Henrik M Reims, Finn P Reinholt, Tom E Ruud, Runkuan Yang, Jan O Høgetveit, Tor I Tønnessen
AIM: To investigate viability assessment of segmental small bowel ischemia/reperfusion in a porcine model. METHODS: In 15 pigs, five or six 30-cm segments of jejunum were simultaneously made ischemic by clamping the mesenteric arteries and veins for 1 to 16 h. Reperfusion was initiated after different intervals of ischemia (1-8 h) and subsequently monitored for 5-15 h. The intestinal segments were regularly photographed and assessed visually and by palpation. Intraluminal lactate and glycerol concentrations were measured by microdialysis, and samples were collected for light microscopy and transmission electron microscopy...
May 14, 2018: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29757478/varying-the-rate-of-intravenous-cocaine-infusion-influences-the-temporal-dynamics-of-both-drug-and-dopamine-concentrations-in-the-striatum
#3
Ellie-Anna Minogianis, Waqqas M Shams, Omar S Mabrouk, Jenny-Marie T Wong, Wayne G Brake, Robert T Kennedy, Patrick du Souich, Anne-Noël Samaha
The faster drugs of abuse reach the brain, the greater is the risk of addiction. Even small differences in the rate of drug delivery can influence outcome. Infusing cocaine intravenously over 5 versus 90-100 seconds promotes sensitization to the psychomotor and incentive motivational effects of the drug and preferentially recruits mesocorticolimbic regions. It remains unclear whether these effects are due to differences in how fast and/or how much drug reaches the brain. Here, we predicted that varying the rate of intravenous cocaine infusion between 5-90 seconds produces different rates of rise of brain drug concentrations, while producing similar peak concentrations...
May 14, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29754278/behavioral-and-noradrenergic-sensitizations-in-vulnerable-traumatized-rats-suggest-common-bases-with-substance-use-disorders
#4
Claire Le Dorze, Jean-Pol Tassin, Fréderic Chauveau, Pascale Gisquet-Verrier
The aim of the present study was to strengthen our hypothesis of a common physiological basis for post-traumatic stress disorder (PTSD) and substance use disorders. This paper investigates the possibility that rats exposed to a PTSD model exhibit noradrenergic and behavioral sensitization, as observed following repeated drugs of abuse injections. First, rats received a single prolonged stress (SPS), combining three consecutive stressors. They were then tested, 2 weeks after the trauma for PTSD-like symptoms to discriminate between vulnerable and resilient rats...
May 12, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29751997/modulation-of-nesfatin-1-induced-cardiovascular-effects-by-the-central-cholinergic-system
#5
Begum Aydin, Gokcen Guvenc, Burcin Altinbas, Nasir Niaz, Murat Yalcin
Nesfatin-1, a peptide whose receptor is yet to be identified, has been shown to be involved in the modulation of feeding, stress, and metabolic responses. Recently, increasing evidence has supported a modulatory role of nesfatin-1 in cardiovascular activity. We have previously reported that nesfatin-1 causes an increase in blood pressure in normotensive and hypotensive rats by increasing plasma catecholamine, vasopressin, and renin levels. Recent reports suggest that nesfatin-1 may activate the central cholinergic system...
May 4, 2018: Neuropeptides
https://www.readbyqxmd.com/read/29750670/modern-postoperative-monitoring-of-free-flaps
#6
Minna Kääriäinen, Elina Halme, Jussi Laranne
PURPOSE OF REVIEW: Flap failure in microvascular reconstruction is a costly complication with total flap loss being the worst-case scenario. With the aim to rapidly identify a postoperative circulatory problem, some susceptible flaps can be saved by careful clinical monitoring or by various technical monitoring methods. In head and neck surgery, where the flaps are often buried and difficult to monitor clinically, a reliable technical monitoring method would be useful. A broad range of different techniques are in use varying according to practical and personal preferences among clinics and surgeons...
May 9, 2018: Current Opinion in Otolaryngology & Head and Neck Surgery
https://www.readbyqxmd.com/read/29748627/deficient-endocannabinoid-signaling-in-the-central-amygdala-contributes-to-alcohol-dependence-related-anxiety-like-behavior-and-excessive-alcohol-intake
#7
Antonia Serrano, Francisco J Pavon, Matthew W Buczynski, Joel Schlosburg, Luis A Natividad, Ilham Y Polis, David G Stouffer, Eric P Zorrilla, Marisa Roberto, Benjamin F Cravatt, Rémi Martin-Fardon, Fernando Rodriguez de Fonseca, Loren H Parsons
Negative emotional states that are associated with excessive alcohol intake, particularly anxiety-like states, have been linked to opponent processes in the central nucleus of the amygdala (CeA), affecting stress-related transmitters and monoamines. This study extends these observations to include endocannabinoid signaling in alcohol-dependent animals. Rats and mice were exposed to chronic intermittent alcohol with vapor inhalation or liquid diet to induce dependence. In vivo microdialysis was used to estimate interstitial concentrations of endocannabinoids [N-arachidonoylethanolamine (anandamide; AEA) and 2-arachidonoylglycerol (2-AG)] and amino acids (glutamate and GABA) in rat CeA...
April 5, 2018: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29745050/aquaporin-4-knockout-mice-exhibit-increased-hypnotic-susceptibility-to-ketamine
#8
Yunluo Lv, Wangshu Dai, Ai Ge, Yi Fan, Gang Hu, Yinming Zeng
PURPOSE: This study examines anesthetic/hypnotic effects of ketamine in AQP4 knockout (KO) and wild-type (WT) mice with the particular focus on neurotransmission. MATERIALS AND METHODS: Ketamine (100 mg/kg) was intraperitoneally injected in 16 WT and 16 KO mice. The hypnotic potencies were evaluated by the loss of the righting reflex (LORR). The amino acids neurotransmitter levels in prefrontal cortex were measured by microdialysis. RESULTS: This study demonstrated that AQP4 knockout significantly shortened the latency compared with WT mice (98...
May 9, 2018: Brain and Behavior
https://www.readbyqxmd.com/read/29727792/chemiluminescent-detection-integrated-with-microdialysis-sampling-for-label-free-measuring-the-affinity-of-ractopamine-monoclonal-antibody
#9
Yali Zhou, Pingshi Wang, Lin Wang, Zhifeng Fu
A novel label-free protocol was developed for measuring the affinity between ractopamine and its monoclonal antibody (McAb) based on microdialysis (MD) on-line sampling integrated with flow injection chemiluminescent detection. In this study, unbound ractopamine was sampled by MD probe from homogeneous immunoreaction equilibrious systems, and then real-time quantified using flow injection chemiluminescent detection. The quantified concentrations of unbound ractopamine in the immunoreaction equilibrious systems were treated with Scatchard analysis and Klotz analysis to obtain the affinity constant...
April 25, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29727706/effects-of-head-up-vs-supine-cpr-on-cerebral-oxygenation-and-cerebral-metabolism-a-prospective-randomized-porcine-study
#10
Gabriel Putzer, Patrick Braun, Judith Martini, Ines Niederstätter, Julia Abram, Andrea Katharina Lindner, Sabrina Neururer, Miriam Mulino, Bernhard Glodny, Raimund Helbok, Peter Mair
BACKGROUND: Recent studies have shown that during cardiopulmonary resuscitation (CPR) head-up position (HUP) as compared to standard supine position (SUP) decreases intracranial pressure (ICP) and increases cerebral perfusion pressure (CPP). The impact of this manoeuvre on brain oxygenation and metabolism is not clear. We therefore investigated HUP as compared to SUP during basic life support (BLS) CPR for their effect on brain oxygenation and metabolism. METHODS: Twenty pigs were anaesthetized and instrumented...
May 1, 2018: Resuscitation
https://www.readbyqxmd.com/read/29725355/pharmacokinetic-comparisons-of-typical-constituents-in-curcumae-rhizoma-and-vinegar-processed-curcumae-rhizoma-after-oral-administration-to-rats
#11
Wei Gu, Jin-Ci Li, De Ji, Lin Li, Ji Zhang, Zi-Hao Pan, Jun-Jie Yang, Tu-Lin Lu, Chun-Qin Mao
The Raw Curcumae Rhizoma (R-CR), included in the Chinese Pharmacopoeia Edition 2015 , is a well-known Chinese herbal medicine. However, the vinegar-processed Curcumae Rhizoma (V-CR) is used more widely than R-CR. The pharmacokinetics comparison of R-CR and V-CR after oral administration to rats is poorly understood. A novel method, rapid resolution liquid chromatography-tandem mass spectrometry (RRLC-MS) coupled with a sensitive, specific, and convenient microdialysis sampling method, free from endogenous interference was developed in this research...
2018: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/29715477/simultaneous-retrodialysis-by-calibrator-for-rapid-in-vivo-recovery-determination-in-target-site-microdialysis
#12
Yichao Yu, Hardik Chandasana, Taran Sangari, Christoph Seubert, Hartmut Derendorf
Concentrations in the interstitial tissue space are of clinical interest for many antibiotics and can be directly measured by microdialysis. Quantitative microdialysis strongly depends on reliable recovery estimates obtained from a suitable calibrator. Cefazolin is frequently used as a prophylactic antibiotic to prevent surgical site infections. This study aimed to develop a reliable and rapid calibration technique for cefazolin microdialysis using cefuroxime as a calibrator, which is applied simultaneously in the opposite direction via retrodialysis...
April 28, 2018: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29713996/the-effects-of-exposure-to-mephedrone-during-adolescence-on-brain-neurotransmission-and-neurotoxicity-in-adult-rats
#13
Katarzyna Kamińska, Karolina Noworyta-Sokołowska, Anna Górska, Joanna Rzemieniec, Agnieszka Wnuk, Adam Wojtas, Grzegorz Kreiner, Małgorzata Kajta, Krystyna Gołembiowska
According to the European Drug Report (2016), the use of synthetic cathinones, such as mephedrone, among young people has rapidly increased in the last years. Studies in humans indicate that psychostimulant drug use in adolescence increases risk of drug abuse in adulthood. Mephedrone by its interaction with transporters for dopamine (DAT) and serotonin (SERT) stimulates their release to the synaptic cleft. In animal studies, high repeated doses of mephedrone given to adolescent but not adult mice or rats induced toxic changes in 5-hydroxytryptamine (5-HT) neurons...
April 30, 2018: Neurotoxicity Research
https://www.readbyqxmd.com/read/29703999/amphetamine-maintenance-differentially-modulates-effects-of-cocaine-methylenedioxypyrovalerone-mdpv-and-methamphetamine-on-intracranial-self-stimulation-and-nucleus-accumbens-dopamine-in-rats
#14
Amy R Johnson, Matthew L Banks, Dana E Selley, S Stevens Negus
Amphetamine maintenance is effective clinically to reduce the consumption of the monoamine uptake inhibitor cocaine but not of the monoamine releaser methamphetamine, and its effectiveness in treating the abuse of other psychostimulants is not known. The mechanisms for differential amphetamine-maintenance effectiveness to treat different types of psychostimulant abuse are also not known. Accordingly, the present study compared the effects of amphetamine maintenance on abuse-related behavioral and neurochemical effects of cocaine, methamphetamine, and the "bath salts" constituent 3,4-methylenedioxypyrovalerone (MDPV) in rats...
April 19, 2018: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29702553/cytokine-and-chemokine-recovery-is-increased-by-colloid-perfusates-during-dermal-microdialysis
#15
Sven R Quist, Claudia Kirbs, Charlotte Kloft, Harald P Gollnick
Cytokines and chemokines play important roles in cell signalling, and microdialysis is a promising tool for monitoring these inflammation markers ex vivo. Therefore, the collecting of these mediators at the highest concentrations possible is crucial. Depending on the size of the mediator of interest, the collection of these high molecular mass molecules has thus far been difficult due to their low recovery, even when using high cut-off (100 kDa) microdialysis membranes. This study aimed to optimize the recovery of various cytokines and chemokines by validating the use of different perfusates in cutaneous microdialysis, and comparing intravenous (i...
April 27, 2018: Materials
https://www.readbyqxmd.com/read/29700231/use-of-subcutaneous-and-intraperitoneal-administration-methods-to-facilitate-cassette-dosing-in-microdialysis-studies-in-rats
#16
Matthew R Durk, Gauri Deshmukh, Nicole Valle, Xiao Ding, Bianca M Liederer, Xingrong Liu
Microdialysis is a powerful technique allowing for real-time measurement of unbound drug concentrations in brain interstitial fluid (ISF) in conscious animals. Use of microdialysis in drug discovery is limited by high resource requirement and low throughput, but this may be improved by cassette dosing. Administering multiple compounds intravenously (IV) of diverse physiochemical properties, it is often very challenging and time-consuming to identify a vehicle that can dissolve all the compounds. To overcome this limitation, the present study explores the possibility of administering a cassette dose of 9 diverse compounds (carbamazepine, citalopram, desmethylclozapine, diphenhydramine, gabapentin, metoclopramide, naltrexone, quinidine, and risperidone) in suspension, rather than in solution, by intraperitoneal and subcutaneous routes, and determining if this is a viable option for assessing BBB penetration in microdialysis studies...
April 26, 2018: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/29698863/development-and-validation-of-a-sensitive-lc-ms-ms-method-for-the-measurement-of-the-checkpoint-kinase-1-inhibitor-prexasertib-and-its-application-in-a-cerebral-microdialysis-study
#17
Bo Zhong, Anil Maharaj, Abigail Davis, Martine F Roussel, Clinton F Stewart
LC MS/MS methods to measure prexasertib in mouse plasma and Ringer's solution containing 0.5% BSA (Ringer's/BSA) were developed and validated. Liquid-liquid extraction with tert-butyl methyl ether was used to extract prexasertib from mouse plasma and Ringer's/BSA. Reverse phase chromatography with gradient elution was performed to separate prexasertib from the endogenous interference in the matrix, followed by MS detection using positive ion MRM mode. The initial calibration curve for mouse plasma samples ranged from 1 to 500 ng/ml, and after validation of that curve and use in a preliminary study another calibration curve (0...
April 17, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29695161/target-induced-horseradish-peroxidase-deactivation-for-multicolor-colorimetric-assay-of-hydrogen-sulfide-in-rat-brain-microdialysis
#18
Zhonghui Chen, Chaoqun Chen, Huawei Huang, Fang Luo, Longhua Guo, Lan Zhang, Zhenyu Lin, Guonan Chen
Hydrogen sulfide (H2S) is important for normal neural functions, which involves in protecting neurons from oxidative stress and neuronal transmission modulation in brain. The detection of H2S is significant for revealing its role in the diagnosis of various disease. In this study, a novel multicolor colorimetric assay based on the etching of gold nanorods (Au NRs) is proposed to evaluate H2S level with the naked eye. This measurement relies on the catalytic oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) via horseradish peroxidase (HRP) to produce TMB2+, which could etch the Au NRs quickly and accompany with a distinct color change...
April 26, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29695042/a-microdialysis-in-adjuvant-arthritic-rats-for-pharmacokinetics%C3%A2-pharmacodynamics-modeling-study-of-geniposide-with-determination-of-drug-concentration-and-efficacy-levels-in-dialysate
#19
Ran Deng, Wei Wang, Hong Wu, Yunjing Zhang, Wenyu Wang, Li Dai, Zhengrong Zhang, Jun Fu, Feng Li
Microdialysis, a sampling method for pharmacokinetics⁻pharmacodynamics (PK⁻PD) modeling in preclinical and clinical studies, is a convenient in vivo sampling technique. Geniposide (GE), an iridoid glycoside compound, is the major active ingredient of Gardenia jasminoides Ellis fruit which has an anti-inflammatory effect. In this study, an articular cavity microdialysis sampling system for adjuvant arthritic (AA) rats was established to study the effect of GE on the release of prostaglandin E₂ (PGE₂) in AA rats induced by Freund's complete adjuvant (FCA)...
April 24, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29691318/control-of-motor-coordination-by-astrocytic-tonic-gaba-release-through-modulation-of-excitation-inhibition-balance-in-cerebellum
#20
Junsung Woo, Joo Ok Min, Dae-Si Kang, Yoo Sung Kim, Guk Hwa Jung, Hyun Jung Park, Sunpil Kim, Heeyoung An, Jea Known, Jeongyeon Kim, Insop Shim, Hyung-Gun Kim, C Justin Lee, Bo-Eun Yoon
Tonic inhibition in the brain is mediated through an activation of extrasynaptic GABAA receptors by the tonically released GABA, resulting in a persistent GABAergic inhibitory action. It is one of the key regulators for neuronal excitability, exerting a powerful action on excitation/inhibition balance. We have previously reported that astrocytic GABA, synthesized by monoamine oxidase B (MAOB), mediates tonic inhibition via GABA-permeable bestrophin 1 (Best1) channel in the cerebellum. However, the role of astrocytic GABA in regulating neuronal excitability, synaptic transmission, and cerebellar brain function has remained elusive...
April 24, 2018: Proceedings of the National Academy of Sciences of the United States of America
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