keyword
MENU ▼
Read by QxMD icon Read
search

Fast scan cyclic voltammetry

keyword
https://www.readbyqxmd.com/read/28196657/dopamine-release-in-the-nucleus-accumbens-is-altered-following-traumatic-brain-injury
#1
Yuan-Hao Chen, Eagle Yi-Kung Huang, Tung-Tai Kuo, Barry J Hoffer, Jonathan Miller, Yu-Ching Chou, Yung-Hsiao Chiang
Mild-to-severe traumatic brain injury (TBI) is frequently associated with prolonged dysfunction of reward circuitry, including motivation and salience, which suggests alterations of dopamine (DA) processing within the core and shell of the nucleus accumbens (NAC). Using fast-scan cyclic voltammetry in a rodent model of traumatic brain injury, we found that stimulus-evoked DA release is distinct in the core and shell of the NAC, with the shell being less responsive to tonic stimulation and more sensitive to the number of pulses when phasic stimulation is applied...
February 11, 2017: Neuroscience
https://www.readbyqxmd.com/read/28196418/automated-algorithm-for-detection-of-transient-adenosine-release
#2
Ryan P Borman, Ying Wang, Michael D Nguyen, Mallikarjunarao Ganesana, Scott T Lee, B Jill Venton
Spontaneous adenosine release events have been discovered in the brain that last only a few seconds. The identification of these adenosine events from fast-scan cyclic voltammetry (FSCV) data is difficult due to the random nature of adenosine release. In this study, we develop an algorithm that automatically identifies and characterizes adenosine transient features, including event time, concentration, and duration. Automating the data analysis reduces analysis time from 10 to 18 h to about 40 min per experiment...
February 15, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28186690/reduced-levels-of-cacna1c-attenuate-mesolimbic-dopamine-system-function
#3
Chantelle E Terrillion, David T Dao, Roger Cachope, Mary Kay Lobo, Adam C Puche, Joseph F Cheer, Todd D Gould
Genetic variation in CACNA1C, which codes for the L-type calcium channel (LTCC) Cav 1.2, is associated with clinical diagnoses of bipolar disorder, depression, and schizophrenia. Dysregulation of the mesolimbic dopamine (DA) system is linked to these syndromes and LTCCs are required for normal DAergic neurotransmission between the ventral tegmental area (VTA) and nucleus accumbens (NAc). It is unclear, however, how variations in CACNA1C genotype, and potential subsequent changes in expression levels in these regions, modify risk...
February 10, 2017: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/28177213/characterization-of-optically-and-electrically-evoked-dopamine-release-in-striatal-slices-from-digenic-knock-in-mice-with-dat-driven-expression-of-channelrhodopsin
#4
Brian O'Neill, Jyoti C Patel, Margaret E Rice
Fast-scan cyclic voltammetry (FCV) is an established method to monitor increases in extracellular dopamine (DA) concentration ([DA]o) in the striatum, which is densely innervated by DA axons. Ex vivo brain slice preparations provide an opportunity to identify endogenous modulators of DA release. For these experiments, local electrical stimulation is often used to elicit release of DA, as well as other transmitters, in the striatal microcircuitry; changes in evoked increases in [DA]o after application of a pharmacological agent (e...
February 15, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28153284/glucose-sensing-on-graphite-screen-printed-electrode-modified-by-sparking-of-copper-nickel-alloys
#5
Daniel Riman, Konstantinos Spyrou, Alexandros E Karantzalis, Jan Hrbac, Mamas I Prodromidis
Electric spark discharge was employed as a green, fast and extremely facile method to modify disposable graphite screen-printed electrodes (SPEs) with copper, nickel and mixed copper/nickel nanoparticles (NPs) in order to be used as nonenzymatic glucose sensors. Direct SPEs-to-metal (copper, nickel or copper/nickel alloys with 25/75, 50/50 and 75/25wt% compositions) sparking at 1.2kV was conducted in the absence of any solutions under ambient conditions. Morphological characterization of the sparked surfaces was performed by scanning electron microscopy, while the chemical composition of the sparked NPs was evaluated with energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy...
April 1, 2017: Talanta
https://www.readbyqxmd.com/read/28127962/hitchhiker-s-guide-to-voltammetry-acute-and-chronic-electrodes-for-in-vivo-fast-scan-cyclic-voltammetry
#6
Nathan T Rodeberg, Stefan G Sandberg, Justin A Johnson, Paul E M Phillips, R Mark Wightman
Fast-scan cyclic voltammetry (FSCV) has been used for over 20 years to study rapid neurotransmission in awake and behaving animals. These experiments were first carried out with carbon-fiber microelectrodes (CFMs) encased in borosilicate glass, which can be inserted into the brain through micromanipulators and guide cannulas. More recently, chronically implantable CFMs constructed with small diameter fused-silica have been introduced. These electrodes can be affixed in the brain with minimal tissue response, which permits longitudinal measurements of neurotransmission in single recording locations during behavior...
February 9, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28071892/transient-adenosine-release-is-modulated-by-nmda-and-gabab-receptors
#7
Michael D Nguyen, Ying Wang, Mallikarjunarao Ganesana, B Jill Venton
Adenosine is a neuroprotective agent that modulates neurotransmission and is modulated by other neurotransmitters. Spontaneous, transient adenosine is a recently discovered mode of signaling where adenosine is released and cleared from the extracellular space quickly, in less than three seconds. Spontaneous adenosine release is regulated by adenosine A1 and A2a receptors, but regulation by other neurotransmitter receptors has not been studied. Here, we examined the effect of glutamate and GABA receptors on the concentration and frequency of spontaneous, transient adenosine release by measuring adenosine with fast-scan cyclic voltammetry in the rat caudate-putamen...
January 30, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28064128/a-novel-luminescence-functionalized-metal-organic-framework-nanoflowers-electrochemiluminesence-sensor-via-on-off-system
#8
Shu Zhu, Xia Lin, Peiyao Ran, Qiao Xia, Chengcheng Yang, Jiao Ma, Yingzi Fu
A novel solid-state electrochemiluminesence (ECL) "on-off" switch system for highly sensitive detection of tryptophan based on the luminescence-functionalized ruthenium metal-organic framework (Ru-MOF) nanoflowers and CdS quantum dots (CdSQDs) was described. Ru-MOF nanoflowers were prepared by a one-step solvothermal method at low temperature and characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared (FTIR) spectra and fluorescence (FL) spectra...
January 3, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28044445/background-signal-as-an-in-situ-predictor-of-dopamine-oxidation-potential-improving-interpretation-of-fast-scan-cyclic-voltammetry-data
#9
Carl J Meunier, James G Roberts, Gregory S McCarty, Leslie A Sombers
Background-subtracted fast-scan cyclic voltammetry (FSCV) has emerged as a powerful analytical technique for monitoring subsecond molecular fluctuations in live brain tissue. Despite increasing utilization of FSCV, efforts to improve the accuracy of quantification have been limited due to the complexity of the technique and the dynamic recording environment. It is clear that variable electrode performance renders calibration necessary for accurate quantification; however, the nature of in vivo measurements can make conventional postcalibration difficult, or even impossible...
January 24, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28038309/diazepam-inhibits-electrically-evoked-and-tonic-dopamine-release-in-the-nucleus-accumbens-and-reverses-the-effect-of-amphetamine
#10
Alexander Gomez-A, Amanda M Fiorenza, Suelen L Boschen, Adam H Sugi, Danielle Beckman, Sergio T Ferreira, Kendall Lee, Charles D Blaha, Claudio Da Cunha
Diazepam is a benzodiazepine receptor agonist with anxiolytic and addictive properties. Although most drugs of abuse increase the level of release of dopamine in the nucleus accumbens, here we show that diazepam not only causes the opposite effect but also prevents amphetamine from enhancing dopamine release. We used 20 min sampling in vivo microdialysis and subsecond fast-scan cyclic voltammetry recordings at carbon-fiber microelectrodes to show that diazepam caused a dose-dependent decrease in the level of tonic and electrically evoked dopamine release in the nucleus accumbens of urethane-anesthetized adult male Swiss mice...
January 26, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28013000/galanin-contributes-to-monoaminergic-dysfunction-and-to-dependent-neurobehavioral-comorbidities-of-epilepsy
#11
Jesus-Servando Medel-Matus, Don Shin, Raman Sankar, Andrey Mazarati
Status epilepticus (SE) in rats, along with chronic epilepsy, leads to the development of behavioral impairments resembling depressive disorder and/or attention deficit/hyperactivity disorder (ADHD), thus reflecting respective comorbidities in epilepsy patients. Suppressed neurotransmitter tone in the raphe nucleus (RN)-prefrontal cortex (PFC) serotonergic pathway and in the locus coeruleus (LC)-PFC noradrenergic pathway underlies depressive- and impulsive-like behavioral deficits respectively. We examined possible mechanisms leading to the monoamine dysfunction in brainstem efferents, namely modulatory effects of the neuropeptide galanin on serotonin (5-HT) and norepinephrine (NE) signaling...
March 2017: Experimental Neurology
https://www.readbyqxmd.com/read/27984698/simultaneous-voltammetric-measurements-of-glucose-and-dopamine-demonstrate-the-coupling-of-glucose-availability-with-increased-metabolic-demand-in-the-rat-striatum
#12
Samantha K Smith, Christie A Lee, Matthew E Dausch, Brian M Horman, Heather B Patisaul, Gregory S McCarty, Leslie A Sombers
Cerebral blood flow ensures delivery of nutrients, such as glucose, to brain sites with increased metabolic demand. However, little is known about rapid glucose dynamics at discrete locations during neuronal activation in vivo. Acute exposure to many substances of abuse elicits dopamine release and neuronal activation in the striatum; however, the concomitant changes in striatal glucose remain largely unknown. Recent developments have combined fast-scan cyclic voltammetry with glucose oxidase enzyme modified carbon-fiber microelectrodes to enable the measurement of glucose dynamics with subsecond temporal resolution in the mammalian brain...
January 17, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/27968717/glycated-hemoglobin-biosensing-integration-formed-on-au-nanoparticle-dotted-tubular-tio2-nanoarray
#13
Utkarsh Jain, Anamika Singh, Naresh Kumar Kuchhal, Nidhi Chauhan
Excessive glucose present in the blood of diabetic patients binds with the hemoglobin of red blood cells resulting in the formation of glycated hemoglobin (HbA1c). Measurement of HbA1c levels may help in identifying the efficacy of the ongoing treatment and hence provide a better control over the disease. In the present study, we have synthesized a sensitive and stable scaffold, which consists of Au nanoparticles (GNPs)-dotted tubular TiO2, for the construction of an electrochemical HbA1c biosensor. 12-phosphotungstic acid has been used as a reducer after depositing well-dispersed GNPs on TiO2 nanotubes (TiO2 NTs) and an electron mediator by accelerating the electron transfer between the conductor and protein...
November 16, 2016: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27966885/high-fat-diet-induced-deficits-in-dopamine-terminal-function-are-reversed-by-restoring-insulin-signaling
#14
Steve C Fordahl, Sara R Jones
Systemically released insulin crosses the blood-brain barrier and binds to insulin receptors on several neural cell types, including dopaminergic neurons. Insulin has been shown to decrease dopamine neuron firing in the ventral tegmental area (VTA), but potentiate release and reuptake at dopamine terminals in the nucleus accumbens (NAc). Here we show that prolonged consumption of a high fat diet blocks insulin's effects in the NAc, but insulin's effects are restored by inhibiting protein tyrosine phosphatase 1B, which supports insulin receptor signaling...
January 3, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/27956150/a-novel-electrochemical-biosensor-based-on-fe3o4-nanoparticles-polyvinyl-alcohol-composite-for-sensitive-detection-of-glucose
#15
Niuosha Sanaeifar, Mohammad Rabiee, Mojgan Abdolrahim, Mohammadreza Tahriri, Daryoosh Vashaee, Lobat Tayebi
In this research, a new electrochemical biosensor was constructed for the glucose detection. Iron oxide nanoparticles (Fe3O4) were synthesized through co-precipitation method. Polyvinyl alcohol-Fe3O4 nanocomposite was prepared by dispersing synthesized nanoparticles in the polyvinyl alcohol (PVA) solution. Glucose oxidase (GOx) was immobilized on the PVA-Fe3O4 nanocomposite via physical adsorption. The mixture of PVA, Fe3O4 nanoparticles and GOx was drop cast on a tin (Sn) electrode surface (GOx/PVA-Fe3O4/Sn)...
February 15, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/27943591/effects-of-lrrk2-inhibitors-on-nigrostriatal-dopaminergic-neurotransmission
#16
Qi Qin, Lian-Teng Zhi, Xian-Ting Li, Zhen-Yu Yue, Guo-Zhong Li, Hui Zhang
INTRODUCTION: Mutations in leucine-rich repeat kinase 2 (LRRK2) are the most prevalent cause of familial and sporadic Parkinson's disease (PD). Because most pathogenic LRRK2 mutations result in enhanced kinase activity, it suggests that LRRK2 inhibitors may serve as a potential treatment for PD. To evaluate whether LRRK2 inhibitors are effective therapies for PD, it is crucial to know whether LRRK2 inhibitors will affect dopaminergic (DAergic) neurotransmission. However, to date, there is no study to investigate the impact of LRRK2 inhibitors on DAergic neurotransmission...
February 2017: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/27936579/reinforcing-doses-of-intravenous-cocaine-produce-only-modest-dopamine-uptake-inhibition
#17
Zachary D Brodnik, Mark J Ferris, Sara R Jones, Rodrigo A España
The reinforcing efficacy of cocaine is thought to stem from inhibition of the dopamine transporter (DAT) and subsequent increases in extracellular dopamine concentrations in the brain. In humans, this hypothesis has generally been supported by positron emission tomography imaging studies where the percent of DATs occupied by cocaine is used as a measure of cocaine activity in the brain. Interpretation of these studies, however, often relies on the assumption that measures of DAT occupancy directly correspond with functional DAT blockade...
December 29, 2016: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/27919729/noradrenergic-modulation-of-evoked-dopamine-release-and-ph-shift-in-the-mouse-dorsal-hippocampus-and-ventral-striatum
#18
Adam Z Weitemier, Thomas J McHugh
Rapid monoamine release in the dorsal hippocampus is not well characterized, despite its postulated role in modulating fast hippocampal circuit dynamics. We measured monoamine release in the dorsal hippocampus upon stimulation of the ventral tegmental area (VTA) with fast-scan cyclic voltammetry in anesthetized norepinephrine-depleted and non-depleted mice. Within the hippocampus, norepinephrine depletion altered the ability of α2 adrenergic compounds and transporter blockers to modulate the small, evoked monoamine signal...
December 2, 2016: Brain Research
https://www.readbyqxmd.com/read/27916553/nio-hedgehog-like-nanostructures-au-polyaniline-nanofibers-reduced-graphene-oxide-nanocomposite-with-electrocatalytic-activity-for-non-enzymatic-detection-of-glucose
#19
Kh Ghanbari, F Ahmadi
A novel sensitive non-enzymatic glucose sensor was fabricated based on nickel oxide hedgehog-like nanostructures decorated ternary gold nanoparticles/polyaniline nanofibers/reduced graphene oxide nanocomposites (NiO/Au/PANI/rGO). The morphology and structure of NiO/Au/PANI/rGO nanocomposites were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Raman spectroscopy, and Fourier transform infrared (FT-IR). Electrochemical impedance spectroscopy (EIS) data also indicated the charge transfer of each layer decreased compared to the underneath layer...
February 1, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/27900618/3d-carbon-nanofiber-microelectrode-arrays-fabricated-by-plasma-assisted-pyrolysis-to-enhance-sensitivity-and-stability-of-real-time-dopamine-detection
#20
Wenwen Yi, Yuanyuan Yang, Parastoo Hashemi, Mark Ming-Cheng Cheng
In this paper, we have fabricated 3D carbon nanofiber microelectrode arrays (MEAs) with highly reproducible and rich chemical surface areas for fast scan cyclic voltammetry (FSCV). Carbon nanofibers are created from negative photoresist by a new process called dual O2 plasma-assisted pyrolysis. The proposed approach significantly improves film adhesion and increases surface reactivity. We showcase our sensor's compatibility with FSCV analysis by demonstrating highly sensitive and stable FSCV dopamine measurements on a prototype 4-channel array...
December 2016: Biomedical Microdevices
keyword
keyword
37102
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"