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Direct current stimulation

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https://www.readbyqxmd.com/read/28334214/tdcs-modulates-visual-gamma-oscillations-and-basal-alpha-activity-in-occipital-cortices-evidence-from-meg
#1
Tony W Wilson, Timothy J McDermott, Mackenzie S Mills, Nathan M Coolidge, Elizabeth Heinrichs-Graham
Transcranial direct-current stimulation (tDCS) is now a widely used method for modulating the human brain, but the resulting physiological effects are not understood. Recent studies have combined magnetoencephalography (MEG) with simultaneous tDCS to evaluate online changes in occipital alpha and gamma oscillations, but no study to date has quantified the offline (i.e., after tDCS) alterations in these responses. Thirty-five healthy adults received active or sham anodal tDCS to the occipital cortices, and then completed a visual stimulation paradigm during MEG that is known to elicit robust gamma and alpha oscillations...
March 10, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28334143/boosting-and-decreasing-action-prediction-abilities-through-excitatory-and-inhibitory-tdcs-of-inferior-frontal-cortex
#2
Alessio Avenanti, Riccardo Paracampo, Laura Annella, Emmanuele Tidoni, Salvatore Maria Aglioti
Influential theories suggest that humans predict others' upcoming actions by using their own motor system as an internal forward model. However, evidence that the motor system is causally essential for predicting others' actions is meager. Using transcranial direct current stimulation (tDCS), we tested the role of the inferior frontal cortex (IFC), in action prediction (AP). We devised a novel AP task where participants observed the initial phases of right-hand reaching-to-grasp actions and had to predict their outcome (i...
March 14, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28332205/evidence-that-5-ht-stimulates-intracellular-ca-2-signalling-and-activates-pannexin-1-currents-in-type-ii-cells-of-the-rat-carotid-body
#3
Sindhubarathi Murali, Min Zhang, Colin A Nurse
Carotid body (CB) chemoreceptor (type I) cells can synthesize and release 5-hydroxytryptamine (5-HT) and increased autocrine-paracrine 5-HT2 receptor signalling contributes to sensory long-term facilitation during chronic intermittent hypoxia (CIH). However, recent studies suggest that adjacent glial-like type II cells can respond to CB paracrine signals by elevating intracellular calcium (Δ[Ca(2+) ]i ) and activating carbenoxolone-sensitive, ATP-permeable, pannexin-1 (Panx-1)-like channels. Here, using dissociated rat CB cultures, we found that 5-HT induced Δ[Ca(2+) ]i responses in a subpopulation of type I cells, and in most (∼67%) type II cells identified by their sensitivity to the P2Y2 receptor agonist, UTP...
March 22, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28331181/multi-walled-carbon-nanotubes-act-as-a-chemokine-and-recruit-macrophages-by-activating-the-plc-ip3-crac-channel-signaling-pathway
#4
Hui Li, Xiao-Qiu Tan, Li Yan, Bo Zeng, Jie Meng, Hai-Yan Xu, Ji-Min Cao
The impact of nanomaterials on immune cells is gaining attention but is not well documented. Here, we report a novel stimulating effect of carboxylated multi-walled carbon nanotubes (c-MWCNTs) on the migration of macrophages and uncover the underlying mechanisms, especially the upstream signaling, using a series of techniques including transwell migration assay, patch clamp, ELISA and confocal microscopy. c-MWCNTs dramatically stimulated the migration of RAW264.7 macrophages when endocytosed, and this effect was abolished by inhibiting phospholipase C (PLC) with U-73122, antagonizing the IP3 receptor with 2-APB, and blocking calcium release-activated calcium (CRAC) channels with SK&F96365...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28328181/role-of-hepcidin-ferroportin-axis-in-the-pathophysiology-diagnosis-and-treatment-in-anemia-of-chronic-inflammation
#5
Arielle L Langer, Yelena Z Ginzburg
Anemia of chronic inflammation (ACI) is a frequently diagnosed anemia and portends an independently increased morbidity and poor outcome associated with multiple underlying diseases. The pathophysiology of ACI is multifactorial, resulting from the effects of inflammatory cytokines which both directly and indirectly suppress erythropoiesis. Recent advances in molecular understanding of iron metabolism provide strong evidence that immune mediators, such as IL-6, lead to hepcidin-induced hypoferremia, iron sequestration, and decreased iron availability for erythropoiesis...
March 22, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28327344/direct-activation-of-ca-2-and-voltage-gated-potassium-channels-of-large-conductance-by-anandamide-in-endothelial-cells-does-not-support-the-presence-of-endothelial-atypical-cannabinoid-receptor
#6
Alexander I Bondarenko, Olga Panasiuk, Iryna Okhai, Fabrizio Montecucco, Karim J Brandt, Francois Mach
Endocannabinoid anandamide induces endothelium-dependent relaxation commonly attributed to stimulation of the G-protein coupled endothelial anandamide receptor. The study addressed the receptor-independent effect of anandamide on large conductance Ca(2+)-dependent K(+) channels expressed in endothelial cell line EA.hy926. Under resting conditions, 10µM anandamide did not significantly influence the resting membrane potential. In a Ca(2+)-free solution the cells were depolarized by ~10 mV. Further administration of 10µM anandamide hyperpolarized the cells by ~8 mV...
March 19, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28326031/can-neuromodulation-also-enhance-social-inequality-some-possible-indirect-interventions-of-the-state
#7
Andrea Lavazza
There is evidence that noninvasive brain stimulation (NIBS), and especially transcranial direct current stimulation (tDCS), can improve some cognitive functions, at least temporarily. However, as the improvement only applies to some "lucky" people, it may raise ethical, social and legal issues related to fairness in selective contexts (exams, competitions, job interviews). In this regard, an important element tends to be overlooked: the variability in individual response to tDCS in particular. If intensive study or practice and massive doses of chemical enhancers can have slightly different effects over different people, tDCS can sometimes be completely ineffective...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28324978/influence-of-electrode-configuration-on-the-electric-field-distribution-during-transcutaneous-spinal-direct-current-stimulation-of-the-cervical-spine
#8
Sofia R Fernandes, Ricardo Salvador, Cornelia Wenger, Mamede A de Carvalho, Pedro C Miranda
Transcutaneous spinal direct current stimulation (tsDCS) is a recent technique with promising neuromodulatory effects on spinal neuronal circuitry. The main objective of the present study was to perform a finite element analysis of the electric field distribution in tsDCS in the cervical spine region, with varying electrode configurations and geometry. A computational model of a human trunk was generated with nine tissue meshes. Three electrode configurations were tested: A) rectangular saline-soaked sponge target and return electrodes placed over C3 and T3 spinous processes, respectively; B1) circular saline-soaked sponge target and return electrodes placed over C7 spinous process and right deltoid muscle, respectively; B2) same configuration as B1, considering circular shaped electrodes with sponge and rubber layers and a small circular connector on the top surface...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324765/hd-tdcs-in-refractory-lateral-frontal-lobe-epilepsy-patients
#9
Sanaz Ahmadi Karvigh, Mahmoud Motamedi, Mahsa Arzani, Javad Hasan Nia Roshan
PURPOSE: To evaluate the anticonvulsant effect of the novel high definition transcranial direct current stimulation (HD-tDCS) method on patients with refractory lateral frontal lobe epilepsy. The effects of HD-tDCS on working memory were also examined. METHOD: 10 adult patients with intractable lateral frontal lobe epilepsy were studied. A central cathode electrode was placed on the epileptogenic zone according to LTM, and 20-min sessions of 2mA HD-tDCS were applied for 10 consecutive days...
March 14, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28321566/differential-effects-of-bifrontal-and-occipital-nerve-stimulation-on-pain-and-fatigue-using-transcranial-direct-current-stimulation-in-fibromyalgia-patients
#10
Wing Ting To, Evan James, Jan Ost, John Hart, Dirk De Ridder, Sven Vanneste
Fibromyalgia is a disorder characterized by widespread musculoskeletal pain frequently accompanied by other symptoms such as fatigue. Moderate improvement from pharmacological and non-pharmacological treatments have proposed non-invasive brain stimulation techniques such as transcranial direct current stimulation (tDCS) to the occipital nerve (more specifically the C2 area) or to the dorsolateral prefrontal cortex (DLPFC) as potential treatments. We aimed to explore the effectiveness of repeated sessions of tDCS (eight sessions) targeting the C2 area and DLPFC in reducing fibromyalgia symptoms, more specifically pain and fatigue...
March 20, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28321440/neuronify-an-educational-simulator-for-neural-circuits
#11
Svenn-Arne Dragly, Milad Hobbi Mobarhan, Andreas Våvang Solbrå, Simen Tennøe, Anders Hafreager, Anders Malthe-Sørenssen, Marianne Fyhn, Torkel Hafting, Gaute T Einevoll
Educational software (apps) can improve science education by providing an interactive way of learning about complicated topics that are hard to explain with text and static illustrations. However, few educational apps are available for simulation of neural networks. Here, we describe an educational app, Neuronify, allowing the user to easily create and explore neural networks in a plug-and-play simulation environment. The user can pick network elements with adjustable parameters from a menu, i.e., synaptically connected neurons modelled as integrate-and-fire neurons and various stimulators (current sources, spike generators, visual, and touch) and recording devices (voltmeter, spike detector, and loudspeaker)...
March 2017: ENeuro
https://www.readbyqxmd.com/read/28320187/repeated-transcranial-direct-current-stimulation-in-prolonged-disorders-of-consciousness-a-double-blind-cross-over-study
#12
Anna Estraneo, Angelo Pascarella, Pasquale Moretta, Orsola Masotta, Salvatore Fiorenza, Grazia Chirico, Emanuela Crispino, Vincenzo Loreto, Luigi Trojano
OBJECTIVE: To evaluate effects of 5 sessions of transcranial direct current stimulation (tDCS) over the left dorsolateral prefrontal cortex in patients with prolonged disorders of consciousness (DOC). METHODS: Seven patients in vegetative state (VS) and 6 in minimally conscious state (MCS), at ≥3months after brain injury, were randomized into two groups: group 1 received one week of active tDCS and 1week of sham stimulation, separated by 1 resting week; group 2 received active and sham stimulation in reverse order...
April 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28316589/a-postural-tremor-highly-responsive-to-transcranial-cerebello-cerebral-dcs-in-arca3
#13
Florian Bodranghien, Nordeyn Oulad Ben Taib, Lionel Van Maldergem, Mario Manto
BACKGROUND AND OBJECTIVES: Cerebellar ataxias are disabling disorders that impact the quality of life of patients. In many cases, an effective treatment is missing. Despite the increasing knowledge on the pathogenesis of cerebellar disorders including genetic aspects, there is currently a gap in the therapeutical management of cerebellar deficits. Cerebellar ataxia associated with ANO10 mutation (ARCA3) presents a disabling cerebellar syndrome. The aim of this study is to report a patient with a marked postural tremor responding to transcranial cerebello-cerebral direct current stimulation (tCCDCS)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28314813/tdcs-induced-modulation-of-gaba-levels-and-resting-state-functional-connectivity-in-older-adults
#14
Daria Antonenko, Florian Schubert, Florian Bohm, Bernd Ittermann, Semiha Aydin, Dayana Hayek, Ulrike Grittner, Agnes Flöel
Transcranial direct current stimulation (tDCS) modulates human behavior, neuronal patterns and metabolite concentrations, with exciting potential for neurorehabilitation. However, the understanding of tDCS-induced alterations on the neuronal level is incomplete and conclusions from young adults, in whom the majority of studies have been conducted, cannot be easily transferred to older populations. Here, we investigated tDCS-induced effects in older adults (N=48, age range 50-79 years) using magnetic resonance spectroscopy to quantify gamma-aminobutyric acid (GABA) levels as well as resting-state functional magnetic resonance imaging to assess sensorimotor network strength and inter-hemispheric connectivity...
March 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28306561/diving-into-the-oocyte-pool
#15
Stine G Kristensen, Susanne E Pors, Claus Y Andersen
PURPOSE OF REVIEW: The ovarian reserve comprises an enormous surplus of follicles. Despite this, some women produce insufficient numbers of oocytes by conventional fertility treatments. However, recent technical accomplishments may transform assisted reproductive technology (ART) in such a way that oocytes are not necessarily the limiting factor. In this review, we present possible new strategies for enhancing the quantity of mature oocytes, and current views on autologous oocytes as potential sources of mitochondria to lift performance of compromised oocytes...
March 16, 2017: Current Opinion in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28302387/efficacy-of-transcranial-direct-current-stimulation-in-women-with-provoked-vestibulodynia
#16
Annie Morin, Guillaume Leonard, Véronique Gougeon, Marie-Pierre Cyr, Guy Waddell, Yves-André Bureau, Isabelle Girard, Mélanie Morin
BACKGROUND: Provoked vestibulodynia is a highly prevalent condition characterized by acute recurrent pain located at the vaginal entrance in response to pressure application or attempted vaginal penetration. Despite a wide variety of treatments offered to women with provoked vestibulodynia, a high proportion of women are refractory to conventional treatment. Transcranial direct-current stimulation is a non-invasive brain stimulation technique that has been shown effective for improving various chronic pain conditions...
March 13, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28298646/fast-and-precise-detection-of-dna-methylation-with-tetramethylammonium-filled-nanopore
#17
Ying Wang, Yani Zhang, Yanli Guo, Xiao-Feng Kang
The tremendous demand for detecting methylated DNA has stimulated intensive studies on developing fast single-molecule techniques with excellent sensitivity, reliability, and selectivity. However, most of these methods cannot directly detect DNA methylation at single-molecule level, which need either special recognizing elements or chemical modification of DNA. Here, we report a tetramethylammonium-based nanopore (termed TMA-NP) sensor that can quickly and accurately detect locus-specific DNA methylation, without bisulfite conversion, chemical modification or enzyme amplification...
March 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28298304/no-consistent-effect-of-cerebellar-transcranial-direct-current-stimulation-tdcs-on-visuomotor-adaptation
#18
Roya Jalali, R Christopher Miall, Joseph M Galea
Cerebellar transcranial direct current stimulation (ctDCS) is known to enhance adaptation to a novel visual rotation (visuomotor adaptation) and it is suggested to hold promise as a therapeutic intervention. However, it is unknown whether this effect is robust across varying task parameters. This question is crucial if ctDCS is to be used clinically, as it must have a consistent and robust effect across a relatively wide range of behaviours. The aim of this study was to examine the effect of ctDCS on visuomotor adaptation across a wide range of task parameters which were systematically varied...
March 15, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28295962/improving-glycemic-control-in-type-2-diabetes-stimulate-insulin-secretion-or-provide-beta-cell-rest
#19
REVIEW
Daniël H van Raalte, C Bruce Verchere
Type 2 diabetes (T2D) is characterized by a gradual decline of pancreatic beta cell function that determines the progressive course of the disease. While beta-cell failure is an important contributor to hyperglycemia, chronic hyperglycemia itself is also detrimental for beta-cell function, likely by inducing prolonged secretory stress on the beta cell as well as through direct glucotoxic mechanisms that have not been fully defined. For years, research has been carried out in search of therapies targeting hyperglycemia that preserve long-term beta-cell function in T2D, a quest that is still ongoing...
March 14, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28295242/an-update-on-non-pharmacological-neuromodulation-for-the-acute-and-preventive-treatment-of-migraine
#20
Francesca Puledda, Peter J Goadsby
OBJECTIVE: To review current neuromodulation treatments available for migraine therapy, both in the acute and preventive setting. METHODS: The published literature was reviewed for studies reporting the effects of different neuromodulation strategies in migraine with and without aura. The use of non-invasive: single pulse transcranial magnetic stimulation, non-invasive vagal nerve stimulation, supraorbital nerve stimulation, and transcranial direct current stimulation, as well as invasive methods such as occipital nerve stimulation and sphenopalatine ganglion stimulation, are assessed...
March 13, 2017: Headache
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