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In vivo patch clamp recording

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https://www.readbyqxmd.com/read/28100741/control-of-spike-transfer-at-hippocampal-mossy-fiber-synapses-in-vivo-by-gabaa-and-gabab-receptor-mediated-inhibition
#1
Stefano Zucca, Marilena Griguoli, Meryl Malézieux, Noëlle Grosjean, Mario Carta, Christophe Mulle
: Despite extensive studies in hippocampal slices and incentive from computational theories, the synaptic mechanisms underlying information transfer at mossy fiber (mf) connections between the dentate gyrus (DG) and CA3 neurons in vivo are still elusive. Here we used an optogenetic approach in mice to selectively target and control the activity of DG granule cells (GCs) while performing whole-cell and juxtacellular recordings of CA3 neurons in vivo In CA3 pyramidal cells (PCs), mf-CA3 synaptic responses consisted predominantly of an IPSP at low stimulation frequency (0...
January 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28099880/modifications-of-inhibitory-transmission-onto-pyramidal-neurons-by-postnatal-exposure-to-mk-801-effects-of-enriched-environment
#2
Amir Shojaei, Afsaneh Kamali Anaraki, Javad Mirnajafi-Zadeh, Nafiseh Atapour
Early enriched environment (EE) prevents several deficits associated with postnatal MK-801 [N-Methyl-D-Aspartate (NMDA) receptor antagonist] treatment such as cognitive and locomotor deficits. We sought physiological correlates to such changes by looking at inhibitory synaptic inputs onto pyramidal cells in a prefrontal cortex slice preparation. Pharmacologically isolated γ-amino-butyric acid A (GABAA) receptor-mediated currents were measured using whole-cell patch clamp recordings. Wistar rats were raised in standard or EE from birth up to the time of experiments and were injected with saline or MK-801 (1mg/kg) on postnatal days (P) 6-10...
January 15, 2017: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/28075010/stimulatory-actions-of-a-novel-thiourea-derivative-on-large-conductance-calcium-activated-potassium-channels
#3
Sheng-Nan Wu, Jyh-Haur Chern, Santai Shen, Hwei-Hisen Chen, Ying-Ting Hsu, Chih-Chin Lee, Ming-Huan Chan, Ming-Chi Lai, Feng-Shiun Shie
AIM: In this study, we examine whether an anti-inflammatory thiourea derivative, compound #326, actions on ion channels. METHODS: The effects of compound #326 on Ca(2+) -activated K(+) channels were evaluated by patch-clamp recordings obtained in cell-attached, inside-out or whole-cell configuration. RESULTS: In pituitary GH3 cells, compound #326 increased the amplitude of Ca(2+) -activated K(+) currents (IK(Ca) ) with an EC50 value of 11...
January 11, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28043879/-6-gingerol-and-6-shogaol-active-ingredients-of-the-traditional-japanese-medicine-hangeshashinto-relief-oral-ulcerative-mucositis-induced-pain-via-action-on-na-channels
#4
Suzuro Hitomi, Kentaro Ono, Kiyoshi Terawaki, Chinami Matsumoto, Keita Mizuno, Kiichiro Yamaguchi, Ryota Imai, Yuji Omiya, Tomohisa Hattori, Yoshio Kase, Kiyotoshi Inenaga
The traditional Japanese herbal medicine hangeshashinto (HST) has beneficial effects for the treatment of oral ulcerative mucositis (OUM) in cancer patients. However, the ingredient-based mechanism that underlies its pain-relieving activity remains unknown. In the present study, to clarify the analgesic mechanism of HST on OUM-induced pain, we investigated putative HST ingredients showing antagonistic effects on Na(+) channels in vitro and in vivo. A screen of 21 major ingredients using automated patch-clamp recordings in channel-expressing cells showed that [6]-gingerol and [6]-shogaol, two components of a Processed Ginger extract, considerably inhibited voltage-activated Na(+) currents...
December 30, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28041911/disinhibition-of-the-intergeniculate-leaflet-network-in-the-wag-rij-rat-model-of-absence-epilepsy
#5
Lukasz Chrobok, Katarzyna Palus, Jagoda Stanislawa Jeczmien-Lazur, Anna Chrzanowska, Mariusz Kepczynski, Marian Henryk Lewandowski
The intergeniculate leaflet (IGL) of the thalamus is a retinorecipient structure implicated in orchestrating circadian rhythmicity. The IGL network is highly GABAergic and consists mainly of neuropeptide Y-synthesising and enkephalinergic neurons. A high density of GFAP-immunoreactive astrocytes has been observed in the IGL, with a probable function in guarding neuronal inhibition. Interestingly, putatively enkephalinergic IGL neurons generate action potentials with an infra-slow oscillatory (ISO) pattern in vivo in urethane anesthetised Wistar rats, under light-on conditions only...
December 30, 2016: Experimental Neurology
https://www.readbyqxmd.com/read/27986658/kv%C3%AE-1-1-senses-pyridine-nucleotide-changes-in-the-mouse-heart-and-modulates-cardiac-electrical-activity
#6
Jared Tur, Kalyan C Chapalamadugu, Chris Katnik, Javier Cuevas, Aruni Bhatnagar, Srinivas M Tipparaju
The present study investigates the physiological role of Kvβ1 subunit for sensing pyridine nucleotide (NADH/NAD+) changes in the heart. We utilized Kvβ1.1 knockout or wild type mice and established that Kvβ1.1 preferentially binds with Kv4.2 and senses the pyridine nucleotide changes in the heart. The cellular action potential duration (APD) obtained from wild type cardiomyocytes showed longer APD's with lactate perfusion which increases intracellular NADH levels, while the APD's remained unaltered in the Kvβ1...
December 16, 2016: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/27979827/protective-roles-of-hepatic-gaba-signaling-in-acute-liver-injury-of-rats
#7
Shuanglian Wang, Yun-Yan Xiang, Jianchun Zhu, Fan Yi, Jingxin Li, Chuanyong Liu, Wei-Yang Lu
Gamma-aminobutyric acid (GABA) is produced by various cells through the catalytic activity of glutamic acid decarboxylase (GAD). Activation of type-A GABA receptor (GABAAR) inhibits stem cell proliferation but protects differentiated cells from injures. The present study investigated hepatic GABA signaling system and the role of this system in liver physiology and pathophysiology. RT-PCR and immunoblot assays identified GAD and GABAAR subunits in rat livers and in HepG2 and Clone 9 hepatocytes. Patch-clamp recording detected GABA-induced currents in Clone 9 hepatocytes and depolarization in WITT cholangiocytes...
December 15, 2016: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/27976716/dendritic-excitation-inhibition-balance-shapes-cerebellar-output-during-motor-behaviour
#8
Marta Jelitai, Paolo Puggioni, Taro Ishikawa, Arianna Rinaldi, Ian Duguid
Feedforward excitatory and inhibitory circuits regulate cerebellar output, but how these circuits interact to shape the somatodendritic excitability of Purkinje cells during motor behaviour remains unresolved. Here we perform dendritic and somatic patch-clamp recordings in vivo combined with optogenetic silencing of interneurons to investigate how dendritic excitation and inhibition generates bidirectional (that is, increased or decreased) Purkinje cell output during self-paced locomotion. We find that granule cells generate a sustained depolarization of Purkinje cell dendrites during movement, which is counterbalanced by variable levels of feedforward inhibition from local interneurons...
December 15, 2016: Nature Communications
https://www.readbyqxmd.com/read/27913590/control-of-spike-transfer-at-hippocampal-mossy-fiber-synapses-in-vivo-by-gabaa-and-gabab-receptor-mediated-inhibition
#9
Stefano Zucca, Marilena Griguoli, Meryl Malézieux, Noëlle Grosjean, Mario Carta, Christophe Mulle
: Despite extensive studies in hippocampal slices and incentive from computational theories, the synaptic mechanisms underlying information transfer at mossy fiber (mf) connections between the dentate gyrus (DG) and CA3 neurons in vivo are still elusive. Here we used an optogenetic approach in mice to selectively target and control the activity of DG granule cells (GCs) while performing whole cell and juxtacellular recordings of CA3 neurons in vivo In CA3 pyramidal cells (PCs), mf-CA3 synaptic responses consisted predominantly of an inhibitory postsynaptic potential (IPSP) at low stimulation frequency (0...
December 2, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27895555/spike-timing-rigidity-is-maintained-in-bursting-neurons-under-pentobarbital-induced-anesthetic-conditions
#10
Risako Kato, Masanori Yamanaka, Eiko Yokota, Noriaki Koshikawa, Masayuki Kobayashi
Pentobarbital potentiates γ-aminobutyric acid (GABA)-mediated inhibitory synaptic transmission by prolonging the open time of GABAA receptors. However, it is unknown how pentobarbital regulates cortical neuronal activities via local circuits in vivo. To examine this question, we performed extracellular unit recording in rat insular cortex under awake and anesthetic conditions. Not a few studies apply time-rescaling theorem to detect the features of repetitive spike firing. Similar to these methods, we define an average spike interval locally in time using random matrix theory (RMT), which enables us to compare different activity states on a universal scale...
2016: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/27881950/a-new-approach-of-modified-submerged-patch-clamp-recording-reveals-interneuronal-dynamics-during-epileptiform-oscillations
#11
Gareth Morris, Premysl Jiruska, John G R Jefferys, Andrew D Powell
Highlights Simultaneous epileptiform LFPs and single-cell activity can be recorded in the membrane chamber.Interneuron firing can be linked to epileptiform high frequency activity.Fast ripples, unique to chronic epilepsy, can be modeled in ex vivo tissue from TeNT-treated rats. Traditionally, visually-guided patch clamp in brain slices using submerged recording conditions has been required to characterize the activity of individual neurons. However, due to limited oxygen availability, submerged conditions truncate fast network oscillations including epileptiform activity...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27872583/ablation-of-sphingosine-1-phosphate-receptor-subtype-3-impairs-hippocampal-neuron-excitability-in-vitro-and-spatial-working-memory-in-vivo
#12
Daniela Weth-Malsch, Michiel Langeslag, Dimitra Beroukas, Luca Zangrandi, Iris Kastenberger, Serena Quarta, Philipp Malsch, Theodora Kalpachidou, Christoph Schwarzer, Richard L Proia, Rainer V Haberberger, Michaela Kress
Understanding the role of the bioactive lipid mediator sphingosine 1-phosphate (S1P) within the central nervous system has recently gained more and more attention, as it has been connected to major diseases such as multiple sclerosis and Alzheimer's disease. Even though much data about the functions of the five S1P receptors has been collected for other organ systems, we still lack a complete understanding for their specific roles, in particular within the brain. Therefore, it was the aim of this study to further elucidate the role of S1P receptor subtype 3 (S1P3) in vivo and in vitro with a special focus on the hippocampus...
2016: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/27862283/footshock-induced-plasticity-of-gabab-signalling-in-the-lateral-habenula-requires-dopamine-and-glucocorticoid-receptors
#13
Salvatore Lecca, Massimo Trusel, Manuel Mameli
The activity of lateral habenula (LHb) represents a substrate for the encoding of negative-valenced events. The exposure to aversive stimuli in naïve mice is sufficient to trigger a reduction in GABAB -mediated signaling in the LHb. This is ultimately instrumental for the hyperactivity of LHb neurons and for the establishment of depressive-like phenotypes. However, the mechanisms responsible for the induction of this aversion-driven plasticity are missing. Using ex-vivo patch-clamp recordings in slices, here we show that exposing mice to a series of inescapable footshocks (FsE) rapidly reduces baclofen-mediated GABAB currents in the LHb...
November 10, 2016: Synapse
https://www.readbyqxmd.com/read/27852780/functional-organization-of-flash-induced-v1-offline-reactivation
#14
Kenta Funayama, Nobuhiro Hagura, Hiroshi Ban, Yuji Ikegaya
: The primary visual cortex exhibits a late, long response with a latency of >300 ms and an immediate early response that occurs ∼100 ms after a visual stimulus. The late response is thought to contribute to visual functions such as sensory perception, iconic memory, working memory, and forming connections between temporally separated stimuli. However, how the visual late response is generated and organized is not completely understood. In the mouse primary visual cortex in vivo, we isolated long-delayed responses by using a brief light-flash stimulus for which the stimulus late response occurred long after the stimulus offset and was not contaminated by the instantaneous response evoked by the stimulus...
November 16, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27847463/metabolic-therapy-for-temporal-lobe-epilepsy-in-a-dish-investigating-mechanisms-of-ketogenic-diet-using-electrophysiological-recordings-in-hippocampal-slices
#15
REVIEW
Masahito Jr Kawamura, David N Ruskin, Susan A Masino
The hippocampus is prone to epileptic seizures and is a key brain region and experimental platform for investigating mechanisms associated with the abnormal neuronal excitability that characterizes a seizure. Accordingly, the hippocampal slice is a common in vitro model to study treatments that may prevent or reduce seizure activity. The ketogenic diet is a metabolic therapy used to treat epilepsy in adults and children for nearly 100 years; it can reduce or eliminate even severe or refractory seizures. New insights into its underlying mechanisms have been revealed by diverse types of electrophysiological recordings in hippocampal slices...
2016: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/27832106/the-effect-of-a-novel-highly-selective-inhibitor-of-the-sodium-calcium-exchanger-ncx-on-cardiac-arrhythmias-in-in-vitro-and-in-vivo-experiments
#16
Zsófia Kohajda, Nikolett Farkas-Morvay, Norbert Jost, Norbert Nagy, Amir Geramipour, András Horváth, Richárd S Varga, Tibor Hornyik, Claudia Corici, Károly Acsai, Balázs Horváth, János Prorok, Balázs Ördög, Szilvia Déri, Dániel Tóth, Jouko Levijoki, Piero Pollesello, Tuula Koskelainen, Leena Otsomaa, András Tóth, István Baczkó, István Leprán, Péter P Nánási, Julius Gy Papp, András Varró, László Virág
BACKGROUND: In this study the effects of a new, highly selective sodium-calcium exchanger (NCX) inhibitor, ORM-10962 were investigated on cardiac NCX current, Ca2+ transients, cell shortening and in experimental arrhythmias. The level of selectivity of the novel inhibitor on several major transmembrane ion currents (L-type Ca2+ current, major repolarizing K+ currents, late Na+ current, Na+/K+ pump current) was also determined. METHODS: Ion currents in single dog ventricular cells (cardiac myocytes; CM), and action potentials in dog cardiac multicellular preparations were recorded utilizing the whole-cell patch clamp and standard microelectrode techniques, respectively...
2016: PloS One
https://www.readbyqxmd.com/read/27827370/ethanol-sensitive-pacemaker-neurons-in-the-mouse-external-globus-pallidus
#17
Karina P Abrahao, Jessica H Chancey, C Savio Chan, David M Lovinger
Although ethanol is one of the most widely used drugs, we still lack a full understanding of which neuronal subtypes are affected by this drug. Pacemaker neurons exert powerful control over brain circuit function, but little is known about ethanol effects on these types of neurons. Neurons in the external globus pallidus (GPe) generate pacemaker activity that controls basal ganglia, circuitry associated with habitual and compulsive drug use. We performed patch-clamp recordings from GPe neurons and found that bath application of ethanol dose-dependently decreased the firing rate of low-frequency GPe neurons, but did not alter the firing of high-frequency neurons...
December 14, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27822504/sleep-and-serotonin-modulate-paracapsular-nitric-oxide-synthase-expressing-neurons-of-the-amygdala
#18
Marco Bocchio, Simon P Fisher, Gunes Unal, Tommas J Ellender, Vladyslav V Vyazovskiy, Marco Capogna
Unraveling the roles of distinct neuron types is a fundamental challenge to understanding brain function in health and disease. In the amygdala, a brain structure regulating emotional behavior, the diversity of GABAergic neurons has been only partially explored. We report a novel population of GABAergic amygdala neurons expressing high levels of neuronal nitric oxide synthase (nNOS). These cells are predominantly localized along basolateral amygdala (BLA) boundaries. Performing ex vivo patch-clamp recordings from nNOS(+) neurons in Nos1-Cre(ER);Ai9 mice, we observed that nNOS(+) neurons located along the external capsule display distinctive electrophysiological properties, axonal and dendritic arborization, and connectivity...
September 2016: ENeuro
https://www.readbyqxmd.com/read/27821773/reduced-high-frequency-motor-neuron-firing-emg-fractionation-and-gait-variability-in-awake-walking-als-mice
#19
Muhamed Hadzipasic, Weiming Ni, Maria Nagy, Natalie Steenrod, Matthew J McGinley, Adi Kaushal, Eleanor Thomas, David A McCormick, Arthur L Horwich
Amyotrophic lateral sclerosis (ALS) is a lethal neurodegenerative disease prominently featuring motor neuron (MN) loss and paralysis. A recent study using whole-cell patch clamp recording of MNs in acute spinal cord slices from symptomatic adult ALS mice showed that the fastest firing MNs are preferentially lost. To measure the in vivo effects of such loss, awake symptomatic-stage ALS mice performing self-initiated walking on a wheel were studied. Both single-unit extracellular recordings within spinal cord MN pools for lower leg flexor and extensor muscles and the electromyograms (EMGs) of the corresponding muscles were recorded...
November 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27814708/neuroprotective-effect-of-a-novel-chinese-herbal-decoction-on-cultured-neurons-and-cerebral-ischemic-rats
#20
Fanny Chui-Fun Ip, Yu-Ming Zhao, Kim-Wan Chan, Elaine Yee-Ling Cheng, Estella Pui-Sze Tong, Oormila Chandrashekar, Guang-Miao Fu, Zhong-Zhen Zhao, Nancy Yuk-Yu Ip
BACKGROUND: Historically, traditional Chinese medicine has been widely used to treat stroke. Based on the theory of Chinese medicine and the modern pharmacological knowledge of herbal medicines, we have designed a neuroprotective formula called Post-Stroke Rehabilitation (PSR), comprising seven herbs - Astragalus membranaceus (Fisch.) Bunge, Salvia miltiorrhiza Bunge, Paeonia lactiflora Pall., Cassia obtusifolia L., Ligusticum chuanxiong Hort., Angelica sinensis (Oliv.) Diels, and Glycyrrhiza uralensis Fisch...
November 4, 2016: BMC Complementary and Alternative Medicine
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