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P/q type calcium channels

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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
#1
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/27823926/cisplatin-induced-neuropathic-pain-is-mediated-by-upregulation-of-n-type-voltage-gated-calcium-channels-in-dorsal-root-ganglion-neurons
#2
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/27806289/vulnerability-of-purkinje-cells-generated-from-spinocerebellar-ataxia-type-6-patient-derived-ipscs
#3
Yoshihito Ishida, Hideshi Kawakami, Hiroyuki Kitajima, Ayaka Nishiyama, Yoshiki Sasai, Haruhisa Inoue, Keiko Muguruma
Spinocerebellar ataxia type 6 (SCA6) is a dominantly inherited neurodegenerative disease characterized by loss of Purkinje cells in the cerebellum. SCA6 is caused by CAG trinucleotide repeat expansion in CACNA1A, which encodes Cav2.1, α1A subunit of P/Q-type calcium channel. However, the pathogenic mechanism and effective therapeutic treatments are still unknown. Here, we have succeeded in generating differentiated Purkinje cells that carry patient genes by combining disease-specific iPSCs and self-organizing culture technologies...
November 1, 2016: Cell Reports
https://www.readbyqxmd.com/read/27744004/histamine-h3-receptor-activation-stimulates-calcium-mobilization-in-a-subpopulation-of-rat-striatal-neurons-in-primary-culture-but-not-in-synaptosomes
#4
Nayeli Rivera-Ramírez, Wilber Montejo-López, María-Cristina López-Méndez, Agustín Guerrero-Hernández, Anayansi Molina-Hernández, Ubaldo García-Hernández, José-Antonio Arias-Montaño
The histamine H3 receptor (H3R) is abundantly expressed in the Central Nervous System where it regulates several functions pre and postsynaptically. H3Rs couple to Gαi/o proteins and trigger or modulate several intracellular signaling pathways, including the cAMP/PKA pathway and the opening of N- and P/Q-type voltage-gated Ca(2+) channels. In transfected cells, activation of the human H3R of 445 amino acids (hH3R445) results in phospholipase C (PLC) stimulation and release of Ca(2+) from intracellular stores...
December 2016: Neurochemistry International
https://www.readbyqxmd.com/read/27625130/-study-on-the-electrophsiological-properties-in-the-stria-vascularis-pericytes-in-cochlear-of-guinea-pig
#5
Y H Liu, Y P Wang, Y Wang, K T Ma, J Q Si, L Li
OBJECTIVE: The purpose of this paper was to study the electrophysiological properties and the type of potassium channels on cell membrane in the stria vascularis pericytes in cochlear of guinea pig. METHODS: Firstly examined the expression of the stria vascularis pericytes by desmin, a marker of pericytes, in cochlear of guinea pig with immunofluorescent method. Using whole-cell patch clamp recording techniques to observe electrophysiological properties in the cochlear pericytes in stria vascularis of guinea pig...
August 7, 2016: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/27597561/teaching-video-neuroimages-p-q-type-voltage-gated-calcium-channel-associated-paraneoplastic-elliptical-nystagmus
#6
Eva A Mistry, Andrew G Lee, Eugene C Lai
No abstract text is available yet for this article.
September 6, 2016: Neurology
https://www.readbyqxmd.com/read/27586650/up-regulation-of-l-type-calcium-channels-in-colonic-inhibitory-motorneurons-of-p-q-type-calcium-channel-deficient-mice
#7
Eileen Rodriguez-Tapia, Alberto Perez-Medina, Xiaochun Bian, James J Galligan
Enteric inhibitory motorneurons use nitric oxide (NO) and a purine neurotransmitter to relax gastrointestinal smooth muscle. Enteric P/Q type Ca(2+) channels contribute to excitatory neuromuscular transmission; their contribution to inhibitory transmission is less clear. We used the colon from tottering mice (tg/tg, loss of function mutation in the α1A pore-forming subunit of P/Q-type Ca(2+) channels) to test the hypothesis that P/Q-type Ca(2+) channels contribute to inhibitory neuromuscular transmission and colonic propulsive motility...
September 1, 2016: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/27581393/neural-cell-proliferation-and-survival-in-the-hippocampus-of-adult-cav-2-1-calcium-ion-channel-mutant-mice
#8
Fikru Nigussie, Pei-San Huang, Kris Lukauskis, Bhupinder Bawa, Eid Moussa, Louise C Abbott
Tottering mutant mice carry a mutation in the pore-forming subunit (α1A) of CaV2.1 (P/Q-type) voltage-gated calcium ion (Ca(2+)) channels resulting in reduced neuronal Ca(2+) current density. We assessed male tottering mice for spatial learning using the Morris water maze. Tottering mice performed worse than wild type mice, suggesting abnormal hippocampal function. Because Ca(2+) influx via voltage-dependent Ca(2+) channels regulates neuronal survival and function, we assessed hippocampus volume and cell density using hematoxylin and eosin stained serial sections...
November 1, 2016: Brain Research
https://www.readbyqxmd.com/read/27530945/-composition-of-potassium-channels-in-normal-rat-coronary-smooth-muscle-cells-and-activation-effects-of-docosahexaenoic-acid
#9
L L Qian, R X Wang, M Q Sun, D Y Xia, X Tang, Y Ji, Y Wu, X Y Liu, S P Dang, Q Chai, T Lu
OBJECTIVE: To investigate the composition of potassium channels in normal rat coronary smooth muscle cells (CASMCs) and the activation effects of docosahexaenoic acid (DHA). METHODS: CASMCs were isolated by enzyme digestion.Effects of different types of potassium channel blockers and/or DHA on potassium channels currents were studied by whole-cell patch clamp technique. RESULTS: Potassium currents were significantly increased with 5 μmol/L DHA perfusion (P<0...
July 24, 2016: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/27475316/a-case-of-encephalomyeloradiculopathy-in-a-non-carcinomatous-patient-associated-with-p-q-type-voltage-gated-calcium-channel-antibodies
#10
Divpreet Kaur, Divisha Raheja
The presence of P/Q type voltage gated calcium channel (VGCC) antibodies has been strongly correlated with Lambert Eaton Syndrome (LES), present in 90% of non-immunocompromised patients with LES. However, there have been case reports which have shown its association between paraneoplastic syndrome affecting both central nervous system and the peripheral nervous system causing encephalomyelitis and sensory neuronopathy/neuropathy. We present a case of a young man, who presented with encephalomyelitis, and was further noted to have superimposed cervical polyradiculopathy associated with P/Q type VGCC antibodies...
November 2016: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/27468821/redistribution-of-cav2-1-channels-and-calcium-ions-in-nerve-terminals-following-end-to-side-neurorrhaphy-ionic-imaging-analysis-by-tof-sims
#11
Chiung-Hui Liu, Hung-Ming Chang, To-Jung Tseng, Chyn-Tair Lan, Li-You Chen, Su-Chung Youn, Jian-Jr Lee, Fu-Der Mai, Jui-Feng Chou, Wen-Chieh Liao
The P/Q-type voltage-dependent calcium channel (Cav2.1) in the presynaptic membranes of motor nerve terminals plays an important role in regulating Ca(2+) transport, resulting in transmitter release within the nervous system. The recovery of Ca(2+)-dependent signal transduction on motor end plates (MEPs) and innervated muscle may directly reflect nerve regeneration following peripheral nerve injury. Although the functional significance of calcium channels and the levels of Ca(2+) signalling in nerve regeneration are well documented, little is known about calcium channel expression and its relation with the dynamic Ca(2+) ion distribution at regenerating MEPs...
November 2016: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/27436538/voltage-gated-p-q-type-calcium-channel-antibodies-associated-with-cerebellar-degeneration
#12
Mary C Spiciarich, Solomon L Moshé
BACKGROUND: Paraneoplastic cerebellar degeneration is a rare neurological condition characterized by diffuse cerebellar dysfunction and magnetic resonance imaging evidence of progressive cerebellar atrophy. It has been associated with several autoantibodies and malignancies in adults. To date, only six cases have been described in male children. PATIENT DESCRIPTION: We describe an eight-year-old girl with a prodrome of abdominal pain and vomiting followed by acute onset diplopia, dysarthria, dysmetria, and ataxia...
September 2016: Pediatric Neurology
https://www.readbyqxmd.com/read/27435762/-missense-mutation-r1345q-in-cacna1a-gene-causes-a-new-type-of-ataxia-with-episodic-tremor-clinical-features-genetic-analysis-and-treatment-in-a-familial-case
#13
Hai-Shan Jiang, Dong-Mei Wang, Qun Wang, Man Yang, Wei Wang, Su-Yue Pan, Ya-Fang Hu
OBJECTIVE: Mutations in CACNA1A, which encodes the P/Q-type calcium channel subunit, are responsible for at least 3 allelic diseases, namely type 2 episodic ataxia (EA-2), familial hemiplegic migraine?type-1 (FHM1), and spinocerebellar ataxia type-6?(SCA 6). Herein we present a case of ataxia with episodic tremors in a 19-year-old man with a missense mutation of CACNA1A gene and summarize the clinical features, genetic analysis and treatment in this case and in his affected family members...
June 20, 2016: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/27364758/interactions-between-calcium-channels-and-sk-channels-in-midbrain-dopamine-neurons-and-their-impact-on-pacemaker-regularity-contrasting-roles-of-n-and-l-type-channels
#14
Veronne de Vrind, Jacqueline Scuvée-Moreau, Guillaume Drion, Cyrine Hmaied, Fabian Philippart, Dominique Engel, Vincent Seutin
Although small-conductance Ca(2+)-activated K(+) (SK) channels and various types of voltage-gated Ca(2+) (Cav) channels have been described in midbrain dopaminergic neurons, the nature of their interactions is unclear. More particularly, the role of various Cav channel types in either promoting irregularity of firing (by generating an inward current during SK channel blockade) or promoting regularity of firing (by providing the source of Ca(2+) for the activation of SK channels) has not been systematically explored...
October 5, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27349310/rest-levels-affect-the-functional-expression-of-voltage-dependent-calcium-channels-and-the-migratory-activity-in-immortalized-gnrh-neurons
#15
Susanna Antoniotti, Federico Alessandro Ruffinatti, Simona Torriano, Anna Luganini, Rosalba D'Alessandro, Davide Lovisolo
The repressor element-1 silencing transcription factor (REST) has emerged as a key controller of neuronal differentiation and has been shown to play a critical role in the expression of the neuronal phenotype; however, much has still to be learned about its role at specific developmental stages and about the functional targets affected. Among these targets, calcium signaling mechanisms are critically dependent on the developmental stage and their full expression is a hallmark of the mature, functional neuron...
August 26, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27321892/dual-color-sted-microscopy-reveals-a-sandwich-structure-of-bassoon-and-piccolo-in-active-zones-of-adult-and-aged-mice
#16
Hiroshi Nishimune, Yomna Badawi, Shuuichi Mori, Kazuhiro Shigemoto
Presynaptic active zones play a pivotal role as synaptic vesicle release sites for synaptic transmission, but the molecular architecture of active zones in mammalian neuromuscular junctions (NMJs) at sub-diffraction limited resolution remains unknown. Bassoon and Piccolo are active zone specific cytosolic proteins essential for active zone assembly in NMJs, ribbon synapses, and brain synapses. These proteins are thought to colocalize and share some functions at active zones. Here, we report an unexpected finding of non-overlapping localization of these two proteins in mouse NMJs revealed using dual-color stimulated emission depletion (STED) super resolution microscopy...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27314908/activity-dependent-calcium-oxygen-and-vascular-responses-in-a-mouse-model-of-familial-hemiplegic-migraine-type-1
#17
Lila Khennouf, Bodil Gesslein, Barbara Lykke Lind, Arn M J M van den Maagdenberg, Martin Lauritzen
OBJECTIVE: Familial hemiplegic migraine type 1 (FHM1) is a subtype of migraine with aura caused by a gain-of-function mutation in the pore-forming α1 subunit of CaV 2.1 (P/Q-type) calcium channels. However, the mechanisms underlying how the disease is brought about and the prolonged aura remain incompletely understood. METHODS: In the anesthetized FHM1 mouse model in vivo, we used two-photon microscopy to measure calcium changes in neurons and astrocytes during somatosensory stimulations and cortical spreading depression (CSD), the putative mechanism of the migraine aura...
August 2016: Annals of Neurology
https://www.readbyqxmd.com/read/27273014/p-q-type-and-t-type-voltage-gated-calcium-channels-are-involved-in-the-contraction-of-mammary-and-brain-blood-vessels-from-hypertensive-patients
#18
Anne D Thuesen, Kristina S Lyngsø, Lotte Rasmussen, Jane Stubbe, Ole Skøtt, Frantz R Poulsen, Christian Bonde Pedersen, Lars M Rasmussen, Pernille B L Hansen
AIM: Calcium channel blockers are widely used in cardiovascular diseases. Beside L-type channels, T- and P/Q-type calcium channels are involved in contraction of human renal blood vessels. It was hypothesized that T- and P/Q -type channels are involved in contraction of human brain and mammary blood vessels. METHODS: Internal mammary arteries from bypass surgery patients and cerebral arterioles from patients with brain tumors with and with-out hypertension were tested in a myograph and perfusion set-up...
June 7, 2016: Acta Physiologica
https://www.readbyqxmd.com/read/27250579/biallelic-cacna1a-mutations-cause-early-onset-epileptic-encephalopathy-with-progressive-cerebral-cerebellar-and-optic-nerve-atrophy
#19
Karit Reinson, Eve Õiglane-Shlik, Inga Talvik, Ulvi Vaher, Anne Õunapuu, Margus Ennok, Rita Teek, Sander Pajusalu, Ülle Murumets, Tiiu Tomberg, Sanna Puusepp, Andres Piirsoo, Tiia Reimand, Katrin Õunap
The CACNA1A gene encodes the transmembrane pore-forming alpha-1A subunit of the Cav 2.1 P/Q-type voltage-gated calcium channel. Several heterozygous mutations within this gene, including nonsense mutations, missense mutations, and expansion of cytosine-adenine-guanine repeats, are known to cause three allelic autosomal dominant conditions-episodic ataxia type 2, familial hemiplegic migraine type 1, and spinocerebellar ataxia type 6. An association with epilepsy and CACNA1A mutations has also been described...
August 2016: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/27225758/dissecting-the-role-of-p-q-type-calcium-channels-in-corticothalamic-circuit-dysfunction-and-absence-epilepsy
#20
Rebecca Shi, Gabrielle M Schroeder, Akua F Nimarko
No abstract text is available yet for this article.
May 25, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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