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Voltage-gated calcium channels

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https://www.readbyqxmd.com/read/27902567/dorsal-root-ganglion-neurons-become-hyperexcitable-and-increase-expression-of-voltage-gated-t-type-calcium-channels-cav3-2-in-paclitaxel-induced-peripheral-neuropathy
#1
Yan Li, Claudio Esteves Tatsui, Laurence D Rhines, Robert Y North, Daniel S Harrison, Ryan M Cassidy, Caj A Johansson, Alyssa K Kosturakis, Denaya D Edwards, Hongmei Zhang, Patrick M Dougherty
Here it is shown that paclitaxel induced neuropathy is associated with the development of spontaneous activity (SA) and hyperexcitability in DRG neurons that is paralleled by increased expression of low-voltage-activated calcium channels (T-type; Cav3.2). The percentage of DRG neurons showing SA and the overall mean rate of SA were significantly higher at day 7 of paclitaxel treatment than in rats receiving vehicle. Cav3.2 expression was increased in L4-6 DRG and spinal cord segments in paclitaxel-treated rats, localized to small calcitonin gene-related peptide expressing and isolectin B4 expressing DRG neurons and to glial fibrillary acidic protein-positive spinal cord cells...
November 24, 2016: Pain
https://www.readbyqxmd.com/read/27900342/cacna1c-protecting-young-hippocampal-neurons-in-the-adult-brain
#2
Héctor De Jesús-Cortés, Anjali M Rajadhyaksha, Andrew A Pieper
Neuropsychiatric disease is the leading cause of disability in the United States, and fourth worldwide.(1,2) Not surprisingly, human genetic studies have revealed a common genetic predisposition for many forms of neuropsychiatric disease, potentially explaining why overlapping symptoms are commonly observed across multiple diagnostic categories. For example, the CACNA1C gene was recently identified in the largest human genome-wide association study to date as a risk loci held in common across 5 major forms of neuropsychiatric disease: bipolar disorder, schizophrenia, major depressive disorder (MDD), autism spectrum disorder and attention deficit-hyperactivity disorder...
2016: Neurogenesis (Austin, Tex.)
https://www.readbyqxmd.com/read/27896815/how-and-why-are-calcium-currents-curtailed-in-the-skeletal-muscle-voltage-gated-calcium-channels
#3
Bernhard E Flucher, Petronel Tuluc
Voltage-gated calcium channels represent the sole mechanism converting electrical signals of excitable cells into cellular functions such as contraction, secretion, and gene regulation. Specific voltage-sensing domains detect changes in membrane potentials and control channel gating. Calcium ions entering through the channel function as second messengers regulating cell functions; with the exception of skeletal muscle, where CaV 1.1 is essentially not functioning as channel but activates calcium release from intracellular stores...
November 29, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/27882454/portraying-the-effect-of-calcium-binding-proteins-on-cytosolic-calcium-concentration-distribution-fractionally-in-nerve-cells
#4
Brajesh Kumar Jha, Hardik Joshi, Devanshi D Dave
Nerve cells like neurons and astrocytes in central nervous system (CNS) take part in the signaling process which means the transformation of the information from one cell to another via signals. The signaling process is affected by various external parameters like buffers calcium-binding proteins, voltage-gated calcium channel. In the present paper, the role of buffers in the cytoplasmic calcium concentration distribution is shown. The elicitation in calcium concentration is due to the presence of lower amount calcium-binding proteins which can be shown graphically...
November 23, 2016: Interdisciplinary Sciences, Computational Life Sciences
https://www.readbyqxmd.com/read/27872869/dynamic-association-of-calcium-channel-subunits-at-the-cellular-membrane
#5
Andreas Voigt, Romy Freund, Jennifer Heck, Markus Missler, Gerald J Obermair, Ulrich Thomas, Martin Heine
High voltage gated calcium channels (VGCCs) are composed of at least three subunits, one pore forming [Formula: see text]-subunit, an intracellular [Formula: see text]-variant, and a mostly extracellular [Formula: see text]-variant. Interactions between these subunits determine the kinetic properties of VGCCs. It is unclear whether these interactions are stable over time or rather transient. Here, we used single-molecule tracking to investigate the surface diffusion of [Formula: see text]- and [Formula: see text]-subunits at the cell surface...
October 2016: Neurophotonics
https://www.readbyqxmd.com/read/27872281/interactions-of-divalent-cations-with-calcium-binding-sites-of-bk-channels-reveal-independent-motions-within-the-gating-ring
#6
Pablo Miranda, Teresa Giraldez, Miguel Holmgren
Large-conductance voltage- and calcium-activated K(+) (BK) channels are key physiological players in muscle, nerve, and endocrine function by integrating intracellular Ca(2+) and membrane voltage signals. The open probability of BK channels is regulated by the intracellular concentration of divalent cations sensed by a large structure in the BK channel called the "gating ring," which is formed by four tandems of regulator of conductance for K(+) (RCK1 and RCK2) domains. In contrast to Ca(2+) that binds to both RCK domains, Mg(2+), Cd(2+), or Ba(2+) interact preferentially with either one or the other...
November 21, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27867359/physiology-and-evolution-of-voltage-gated-calcium-channels-in-early-diverging-animal-phyla-cnidaria-placozoa-porifera-and-ctenophora
#7
Adriano Senatore, Hamad Raiss, Phuong Le
Voltage-gated calcium (Cav) channels serve dual roles in the cell, where they can both depolarize the membrane potential for electrical excitability, and activate transient cytoplasmic Ca(2+) signals. In animals, Cav channels play crucial roles including driving muscle contraction (excitation-contraction coupling), gene expression (excitation-transcription coupling), pre-synaptic and neuroendocrine exocytosis (excitation-secretion coupling), regulation of flagellar/ciliary beating, and regulation of cellular excitability, either directly or through modulation of other Ca(2+)-sensitive ion channels...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27864509/loss-of-%C3%AE-adrenergic-stimulated-phosphorylation-of-cav1-2-channels-on-ser1700-leads-to-heart-failure
#8
Linghai Yang, Dao-Fu Dai, Can Yuan, Ruth E Westenbroek, Haijie Yu, Nastassya West, Horacio O de la Iglesia, William A Catterall
L-type Ca(2+) currents conducted by voltage-gated calcium channel 1.2 (CaV1.2) initiate excitation-contraction coupling in the heart, and altered expression of CaV1.2 causes heart failure in mice. Here we show unexpectedly that reducing β-adrenergic regulation of CaV1.2 channels by mutation of a single PKA site, Ser1700, in the proximal C-terminal domain causes reduced contractile function, cardiac hypertrophy, and heart failure without changes in expression, localization, or function of the CaV1.2 protein in the mutant mice (SA mice)...
November 18, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27861914/a-unifying-hypothesis-for-m1-muscarinic-receptor-signalling-in-pyramidal-neurons
#9
Sameera Dasari, Corey Hill, Allan T Gulledge
Gq -coupled muscarinic acetylcholine (ACh) receptors (mAChRs) mediate two distinct electrophysiological responses in cortical pyramidal neurons: transient inhibition driven by calcium-dependent small conductance potassium ("SK") channels, and longer-lasting and voltage-dependent excitation involving non-specific cation channels. Here we examine the interaction of these two cholinergic responses with respect to their contributions to intracellular calcium dynamics, testing the unifying hypothesis that rundown of inhibitory SK responses at resting membrane potentials (RMPs) reflects depletion of intracellular calcium stores, while mAChR-driven excitation acts to refill those stores by promoting voltage-dependent entry of extracellular calcium...
November 12, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/27857685/conditional-knockout-of-cav2-1-disrupts-the-accuracy-of-spatial-recognition-of-ca1-place-cells-and-spatial-contextual-recognition-behavior
#10
Dahee Jung, Yu J Hwang, Hoon Ryu, Masanobu Kano, Kenji Sakimura, Jeiwon Cho
Hippocampal pyramidal neurons play an essential role in processing spatial information as implicated with its place-dependent firing. Although, previous slice physiology studies have reported that voltage gated calcium channels contribute to spike shapes and corresponding firing rate in the hippocampus, the roles of P/Q type calcium channels (Cav2.1) underlying neural activity in behaving mice have not been well-investigated. To determine physiological and behavioral roles of Cav2.1, we conducted place cell recordings in CA1 and hippocampus dependent learning/memory tasks using mice lacking Cav2...
2016: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/27851552/1917-encephalitis-from-gaba-b-and-voltage-gated-calcium-channel-antibodies-in-small-cell-lung-cancer
#11
Madeleine Alexeeva, Linh Tran, Mohamed Mansour
No abstract text is available yet for this article.
December 2016: Critical Care Medicine
https://www.readbyqxmd.com/read/27848217/pregabalin-for-the-treatment-of-drug-and-alcohol-withdrawal-symptoms-a-comprehensive-review
#12
REVIEW
Rainer Freynhagen, Miroslav Backonja, Stephan Schug, Gavin Lyndon, Bruce Parsons, Stephen Watt, Regina Behar
Treatments for physical dependence and associated withdrawal symptoms following the abrupt discontinuation of prescription drugs (such as opioids and benzodiazepines), nicotine, alcohol, and cannabinoids are available, but there is still a need for new and more effective therapies. This review examines evidence supporting the potential use of pregabalin, an α2δ voltage-gated calcium channel subunit ligand, for the treatment of physical dependence and associated withdrawal symptoms. A literature search of the MEDLINE and Cochrane Library databases up to and including 11 December 2015 was conducted...
November 16, 2016: CNS Drugs
https://www.readbyqxmd.com/read/27836728/altered-gene-expression-profile-in-a-mouse-model-of-scn8a-encephalopathy
#13
Ryan S Sprissler, Jacy L Wagnon, Rosie K Bunton-Stasyshyn, Miriam H Meisler, Michael F Hammer
SCN8A encephalopathy is a severe, early-onset epilepsy disorder resulting from de novo gain-of-function mutations in the voltage-gated sodium channel Nav1.6. To identify the effects of this disorder on mRNA expression, RNA-seq was performed on brain tissue from a knock-in mouse expressing the patient mutation p.Asn1768Asp (N1768D). RNA was isolated from forebrain, cerebellum, and brainstem both before and after seizure onset, and from age-matched wildtype littermates. Altered transcript profiles were observed only in forebrain and only after seizures...
November 9, 2016: Experimental Neurology
https://www.readbyqxmd.com/read/27832601/calcium-dynamics-and-regulation-in-horizontal-cells-of-the-vertebrate-retina-lessons-from-teleosts
#14
Michael William Country, Michael G Jonz
Horizontal cells (HCs) are inhibitory interneurons of the vertebrate retina. Unlike typical neurons, HCs are chronically depolarized in the dark, leading to a constant influx of Ca(2+) Therefore, mechanisms of Ca(2+) homeostasis in HCs must differ from neurons elsewhere in the central nervous system, which undergo excitotoxicity when they are chronically depolarized or stressed with Ca(2+) Horizontal cells are especially well characterized in teleost fish, and have been used to unlock mysteries of the vertebrate retina for over a century...
November 2, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/27826710/the-action-of-smooth-muscle-cell-potassium-channels-in-the-pathology-of-pulmonary-arterial-hypertension
#15
REVIEW
Yasunobu Hayabuchi
Many different types of potassium channels with various functions exist in pulmonary artery smooth muscle cells, contributing to many physiological actions and pathological conditions. The deep involvement of these channels in the onset and exacerbation of pulmonary arterial hypertension (PAH) also continues to be revealed. In 2013, KCNK3 (TASK1), which encodes a type of two-pore domain potassium channel, was shown to be a predisposing gene for PAH by genetic mutation, and it was added to the PAH classification at the Fifth World Symposium on Pulmonary Hypertension (Nice International Conference)...
November 8, 2016: Pediatric Cardiology
https://www.readbyqxmd.com/read/27826230/ampa-receptors-are-involved-in-store-operated-calcium-entry-and-interact-with-stim-proteins-in-rat-primary-cortical-neurons
#16
Joanna Gruszczynska-Biegala, Maria Sladowska, Jacek Kuznicki
The process of store-operated calcium entry (SOCE) leads to refilling the endoplasmic reticulum (ER) with calcium ions (Ca(2+)) after their release into the cytoplasm. Interactions between (ER)-located Ca(2+) sensors (stromal interaction molecule 1 [STIM1] and STIM2) and plasma membrane-located Ca(2+) channel-forming protein (Orai1) underlie SOCE and are well described in non-excitable cells. In neurons, however, SOCE appears to be more complex because of the importance of Ca(2+) influx via voltage-gated or ionotropic receptor-operated Ca(2+) channels...
2016: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/27826078/participation-of-potassium-channels-in-the-antinociceptive-effect-of-docosahexaenoic-acid-in-the-rat-formalin-test
#17
Arizai Yolia Landa-Juárez, Mario I Ortiz, Gilberto Castañeda-Hernández, Aracely Evangelina Chávez-Piña
Docosahexaenoic acid (DHA) is an omega-3 polyunsaturated fatty acid (PUFA) that has shown gastroprotective, cardioprotective, neuroprotective, anti-inflammatory and antinociceptive effects in different models. However, its action mechanism is still not well-defined. Reports indicate that some PUFAs regulate potassium (K(+)) channels in ventricular myocytes of rodents. As a result, the aim of this study was to evaluate the probable participation of K(+) channels in the antinociceptive effect of DHA. The rat paw 1% formalin test was used to assess nociception and antinociception...
November 6, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27823932/n-and-l-type-calcium-channels-blocker-cilnidipine-ameliorates-neuropathic-pain
#18
Shohei Yamamoto, Yuma Suzuki, Hideki Ono, Kazuhiko Kume, Masahiro Ohsawa
Cilnidipine is a dihydropyridine derivative that inhibits N-type and L-type voltage-gated Ca(2+) channels (VDCCs). We recently reported that a selective N-type VDCC blocker attenuated the spinal long-term potentiation (LTP) of C-fiber-evoked field potentials recorded in the spinal dorsal horn of rats, which served as a model for examining synaptic function during central pain sensitization. In this study, we investigated the effects of cilnidipine on the changes related to neuropathic pain induced by nerve injury...
November 4, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27823926/cisplatin-induced-neuropathic-pain-is-mediated-by-upregulation-of-n-type-voltage-gated-calcium-channels-in-dorsal-root-ganglion-neurons
#19
Markus Leo, Linda-Isabell Schmitt, Martin Erkel, Margarita Melnikova, Jürgen Thomale, Tim Hagenacker
Cisplatin is important in the treatment of various types of cancer. Although it is highly effective, it also has severe side effects, with neurotoxicity in dorsal root ganglion (DRG) neurons being one of the most common. The key mechanisms of neurotoxicity are still controversially discussed; however, disturbances of the calcium homeostasis in DRG neurons have been suggested to mediate cisplatin neurotoxicity. By using the whole-cell patch-clamp technique, immunostaining and behavioral experiments with Sprague-Dawley rats, we examined the influence of short- and long-term exposure to cisplatin on voltage-gated calcium channel (VGCC) currents (ICa(V)) in small DRG neurons...
November 5, 2016: Experimental Neurology
https://www.readbyqxmd.com/read/27816328/tubular-aggregates-in-autoimmune-lambert-eaton-myasthenic-syndrome
#20
Isabell Cordts, Fabian Funk, Jörg B Schulz, Joachim Weis, Kristl G Claeys
Tubular aggregates are accumulations of densely packed tubules in muscle fibers, occurring in distinct hereditary and acquired disorders. We present a patient with tubular aggregates and autoimmune Lambert-Eaton myasthenic syndrome. Initially, he showed mild proximal weakness, borderline decrement on 3 Hz stimulation, and slightly elevated creatine kinase. Muscle biopsy revealed tubular aggregates in type II fibers. Due to a good response to pyridostigmine, a limb-girdle myasthenia with tubular aggregates was suspected, but genetic analyses of GFPT1, DPGAT1, and ALG2 were normal...
September 20, 2016: Neuromuscular Disorders: NMD
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