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calcium channel pumps

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https://www.readbyqxmd.com/read/27895534/an-automated-perifusion-system-for-modifying-cell-culture-conditions-over-time
#1
Nicholas B Whitticar, Elisha W Strahler, Parthiban Rajan, Savas Kaya, Craig S Nunemaker
BACKGROUND: Cells are continuously exposed to changes in their environment. Endocrine systems, in particular, communicate by rhythms and feedback loops. In this study, we developed an automated system to produce such conditions for cultured cells in a precisely timed manner. We utilized a programmable pair of syringe pumps for inflow and a peristaltic pump for outflow to create rhythmic pulses at 5-min intervals in solutions that mimic the endogenous patterns of insulin produced by pancreatic islets as a test case...
2016: Biological Procedures Online
https://www.readbyqxmd.com/read/27872214/effects-of-prolonged-anoxia-on-electrical-activity-of-the-heart-in-crucian-carp-carassius-carassius
#2
Elisa Tikkanen, Jaakko Haverinen, Stuart Egginton, Minna Hassinen, Matti Vornanen
The effects of sustained anoxia on cardiac electrical excitability were examined in the anoxia-tolerant Crucian carp (Carassius carassius). The electrocardiogram (ECG) and expression of excitation-contraction coupling genes were studied in fish acclimatised to normoxia in summer (+18°C) or winter (+2°C), and in winter fish after 1, 3 and 6 weeks of anoxia. Anoxia induced a sustained bradycardia from a heart rate of 10.3±0.77 to 4.1±0.29 bpm (P<0.05) after 5 weeks, and heart rate slowly recovered to control levels when oxygen was restored...
November 21, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27846041/factors-affecting-the-sensitivity-of-tc-99m-methoxyisobutylisonitrile-dual-phase-parathyroid-single-photon-emission-computed-tomography-in-primary-hyperparathyroidism
#3
Mine Araz, Derya Çayir, Mehmet Erdoğan, Bekir Uçan, Erman Çakal
OBJECTIVE: The aim of this study was to investigate the effects of thyroid diseases and regularly used medications on the sensitivity of Tc-99m methoxyisobutylisonitrile (MIBI) dual-phase parathyroid single photon emission computed tomography (SPECT) and to define indicatives of the result of the study. PATIENTS AND METHODS: Overall, 218 primary hyperparathyroidism patients (190 women, 28 men, mean age: 57±14 years) with thyroid-parathyroid ultrasonography and Tc-99m MIBI dual-phase parathyroid SPECT were retrospectively enrolled...
November 11, 2016: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/27832601/calcium-dynamics-and-regulation-in-horizontal-cells-of-the-vertebrate-retina-lessons-from-teleosts
#4
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/27785038/association-of-medications-for-lifestyle-related-diseases-with-reflux-esophagitis
#5
Daisuke Asaoka, Akihito Nagahara, Mariko Hojo, Kenshi Matsumoto, Hiroya Ueyama, Kohei Matsumoto, Kentaro Izumi, Tsutomu Takeda, Hiroyuki Komori, Yoichi Akazawa, Yuji Shimada, Taro Osada, Sumio Watanabe
BACKGROUND: Because of a change in lifestyle, especially adoption of westernized eating habits, lifestyle-related diseases have become increasingly prevalent. The aim of this study was to investigate the association of medications for lifestyle-related diseases with reflux esophagitis (RE). METHODS: We conducted a hospital-based, cross-sectional retrospective study of consecutive outpatients who received an upper gastrointestinal endoscopy in our department from February 2008 to November 2014, which was performed by one specialist who was a member of the Japan Gastroenterological Endoscopy Society...
2016: Therapeutics and Clinical Risk Management
https://www.readbyqxmd.com/read/27768059/determination-of-the-relative-cell-surface-and-total-expression-of-recombinant-ion-channels-using-flow-cytometry
#6
Benoîte Bourdin, Emilie Segura, Marie-Philippe Tétreault, Sylvie Lesage, Lucie Parent
Inherited or de novo mutations in cation-selective channels may lead to sudden cardiac death. Alteration in the plasma membrane trafficking of these multi-spanning transmembrane proteins, with or without change in channel gating, is often postulated to contribute significantly in this process. It has thus become critical to develop a method to quantify the change of the relative cell surface expression of cardiac ion channels on a large scale. Herein, a detailed protocol is provided to determine the relative total and cell surface expression of cardiac L-type calcium channels CaV1...
September 28, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27747833/potentially-inappropriate-medications-in-elderly-haemodialysis-patients-using-the-stopp-criteria
#7
Krystina Parker, Willy Aasebø, Knut Stavem
BACKGROUND: Polypharmacy is commonly applied to elderly haemodialysis patients for treating terminal renal failure and multiple co-morbidities. Potentially inappropriate medications (PIMs) in multidrug regimens in geriatric populations can be identified using specially designed screening tools. OBJECTIVE: The aims of this study were to estimate the prevalence of PIMs by applying the Screening Tool of Older Persons' Prescriptions (STOPP) criteria and the Beers criteria to elderly haemodialysis patients and to assess the association of some risk factors with the presence of PIMs...
September 2016: Drugs—Real World Outcomes
https://www.readbyqxmd.com/read/27694578/redox-assisted-regulation-of-ca2-homeostasis-in-the-endoplasmic-reticulum-by-disulfide-reductase-erdj5
#8
Ryo Ushioda, Akitoshi Miyamoto, Michio Inoue, Satoshi Watanabe, Masaki Okumura, Ken-Ichi Maegawa, Kaiku Uegaki, Shohei Fujii, Yasuko Fukuda, Masataka Umitsu, Junichi Takagi, Kenji Inaba, Katsuhiko Mikoshiba, Kazuhiro Nagata
Calcium ion (Ca(2+)) is an important second messenger that regulates numerous cellular functions. Intracellular Ca(2+) concentration ([Ca(2+)]i) is strictly controlled by Ca(2+) channels and pumps on the endoplasmic reticulum (ER) and plasma membranes. The ER calcium pump, sarco/endoplasmic reticulum calcium ATPase (SERCA), imports Ca(2+) from the cytosol into the ER in an ATPase activity-dependent manner. The activity of SERCA2b, the ubiquitous isoform of SERCA, is negatively regulated by disulfide bond formation between two luminal cysteines...
October 11, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27627854/transient-exposure-to-calcium-ionophore-enables-in-vitro-fertilization-in-sterile-mouse-models
#9
Felipe A Navarrete, Antonio Alvau, Hoi Chang Lee, Lonny R Levin, Jochen Buck, Patricia Martin-De Leon, Celia M Santi, Dario Krapf, Jesse Mager, Rafael A Fissore, Ana M Salicioni, Alberto Darszon, Pablo E Visconti
Mammalian sperm acquire fertilizing capacity in the female tract in a process called capacitation. At the molecular level, capacitation requires protein kinase A activation, changes in membrane potential and an increase in intracellular calcium. Inhibition of these pathways results in loss of fertilizing ability in vivo and in vitro. We demonstrated that transient incubation of mouse sperm with Ca(2+) ionophore accelerated capacitation and rescued fertilizing capacity in sperm with inactivated PKA function...
September 15, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27603551/effects-of-commonly-used-chronic-medications-on-the-outcomes-of-ipilimumab-therapy-in-patients-with-metastatic-melanoma
#10
Jarrett J Failing, Heidi D Finnes, Lisa A Kottschade, Jacob B Allred, Svetomir N Markovic
Ipilimumab can induce long-term survival in 20% of patients with metastatic melanoma. Concurrent chronic medications may impact the patient's immune system, possess antimelanoma properties, and potentially affect clinical outcomes. This retrospective study sought to describe the efficacy and toxicity effects of 12 classes of chronic medications in metastatic melanoma patients treated with ipilimumab. A total of 159 adults who received ipilimumab for metastatic melanoma at Mayo Clinic (Rochester, Minnesota, USA) from 1 March 2011 through 31 December 2014 were included...
September 3, 2016: Melanoma Research
https://www.readbyqxmd.com/read/27579540/imatinib-and-polypharmacy-in-very-old-patients-with-chronic-myeloid-leukemia-effects-on-response-rate-toxicity-and-outcome
#11
Alessandra Iurlo, Alessandro Nobili, Roberto Latagliata, Cristina Bucelli, Fausto Castagnetti, Massimo Breccia, Elisabetta Abruzzese, Daniele Cattaneo, Carmen Fava, Dario Ferrero, Antonella Gozzini, Massimiliano Bonifacio, Mario Tiribelli, Patrizia Pregno, Fabio Stagno, Paolo Vigneri, Mario Annunziata, Francesco Cavazzini, Gianni Binotto, Giovanna Mansueto, Sabina Russo, Franca Falzetti, Enrico Montefusco, Gabriele Gugliotta, Sergio Storti, Ada M D'Addosio, Luigi Scaffidi, Laura Cortesi, Michele Cedrone, Antonella Russo Rossi, Paolo Avanzini, Endri Mauro, Antonio Spadea, Francesca Celesti, Gianfranco Giglio, Alessandro Isidori, Monica Crugnola, Elisabetta Calistri, Federica Sorà, Giovanna Rege-Cambrin, Simona Sica, Luigiana Luciano, Sara Galimberti, Ester M Orlandi, Monica Bocchia, Mauro Tettamanti, Giuliana Alimena, Giuseppe Saglio, Gianantonio Rosti, Pier Mannuccio Mannucci, Agostino Cortelezzi
BACKGROUND: About 40% of all patients with chronic myeloid leukemia are currently old or very old. They are effectively treated with imatinib, even though underrepresented in clinical studies. Furthermore, as it happens in the general population, they often receive multiple drugs for associated chronic illnesses. Aim of this study was to assess whether or not in imatinib-treated patients aged >75 years the exposure to polypharmacy (5 drugs or more) had an impact on cytogenetic and molecular response rates, event-free and overall survival, as well as on hematological or extra-hematological toxicity...
August 27, 2016: Oncotarget
https://www.readbyqxmd.com/read/27545605/astroglial-calcium-signalling-in-alzheimer-s-disease
#12
Alexei Verkhratsky, J J Rodríguez-Arellano, Vladimir Parpura, Robert Zorec
Neuroglial contribution to Alzheimer's disease (AD) is pathologically relevant and highly heterogeneous. Reactive astrogliosis and activation of microglia contribute to neuroinflammation, whereas astroglial and oligodendroglial atrophy affect synaptic transmission and underlie the overall disruption of the central nervous system (CNS) connectome. Astroglial function is tightly integrated with the intracellular ionic signalling mediated by complex dynamics of cytosolic concentrations of free Ca(2+) and Na(+)...
August 18, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27526200/calcium-dynamics-of-ex-vivo-long-term-cultured-cd8-t-cells-are-regulated-by-changes-in-redox-metabolism
#13
Catherine A Rivet, Ariel S Kniss-James, Margaret A Gran, Anish Potnis, Abby Hill, Hang Lu, Melissa L Kemp
T cells reach a state of replicative senescence characterized by a decreased ability to proliferate and respond to foreign antigens. Calcium release associated with TCR engagement is widely used as a surrogate measure of T cell response. Using an ex vivo culture model that partially replicates features of organismal aging, we observe that while the amplitude of Ca2+ signaling does not change with time in culture, older T cells exhibit faster Ca2+ rise and a faster decay. Gene expression analysis of Ca2+ channels and pumps expressed in T cells by RT-qPCR identified overexpression of the plasma membrane CRAC channel subunit ORAI1 and PMCA in older T cells...
2016: PloS One
https://www.readbyqxmd.com/read/27523793/glutathione-s-transferase-%C3%AF-subunit-as-a-phenotypic-suppressor-of-pmr1%C3%AE-strain-the-kluyveromyces-lactis-model-for-hailey-hailey-disease
#14
G Ficociello, E Zanni, S Cialfi, C Aurizi, G Biolcati, C Palleschi, C Talora, D Uccelletti
BACKGROUND: Hailey-Hailey disease (HHD), also known as familial benign chronic pemphigus, is a rare, chronic and recurrent blistering disorder, histologically characterized by suprabasal acantholysis. HHD has been linked to mutations in ATP2C1, the gene encoding the human adenosine triphosphate (ATP)-powered calcium channel pump. METHODS: In this work, the genetically tractable yeast Kluyveromyces lactis has been used to study the molecular basis of Hailey-Hailey disease...
November 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27493505/microscopic-heat-pulse-induced-calcium-dynamics-in-single-wi-38-fibroblasts
#15
Hideki Itoh, Kotaro Oyama, Madoka Suzuki, Shin'ichi Ishiwata
Temperature-sensitive Ca(2+) dynamics occur primarily through transient receptor potential channels, but also by means of Ca(2+) channels and pumps on the endoplasmic reticulum membrane. As such, cytoplasmic Ca(2+) concentration ([Ca(2+)]cyt) is re-equilibrated by changes in ambient temperature. The present study investigated the effects of heat pulses (heating duration: 2 s or 150 s) on [Ca(2+)]cyt in single WI-38 fibroblasts, which are considered as normal cells. We found that Ca(2+) burst occurred immediately after short (2 s) heat pulse, which is similar to our previous report on HeLa cells, but with less thermosensitivity...
2014: Biophysics (Nagoya-Shi, Japan)
https://www.readbyqxmd.com/read/27445835/atp1a2-mutations-in-migraine-seeing-through-the-facets-of-an-ion-pump-onto-the-neurobiology-of-disease
#16
REVIEW
Thomas Friedrich, Neslihan N Tavraz, Cornelia Junghans
Mutations in four genes have been identified in familial hemiplegic migraine (FHM), from which CACNA1A (FHM type 1) and SCN1A (FHM type 3) code for neuronal voltage-gated calcium or sodium channels, respectively, while ATP1A2 (FHM type 2) encodes the α2 isoform of the Na(+),K(+)-ATPase's catalytic subunit, thus classifying FHM primarily as an ion channel/ion transporter pathology. FHM type 4 is attributed to mutations in the PRRT2 gene, which encodes a proline-rich transmembrane protein of as yet unknown function...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27420625/-mitochondria-calcium-homeostasis-and-calcium-signaling
#17
I B Zavodnik
Са2+ is a very important and versatile intracellular signal which controls numerous biochemical and physiological (pathophysiological) processes in the cell. Good evidence exists that mitochondria are sensors, decoders and regulators of calcium signaling. Precise regulation of calcium signaling in the cell involves numerous molecular targets, which induce and decode changes of Са2+ concentrations in the cell (pumps, channels, Са2+-binding proteins, Са2+-dependent enzymes, localized in the cytoplasm and organelles)...
March 2016: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
https://www.readbyqxmd.com/read/27376531/from-contraction-to-gene-expression-nanojunctions-of-the-sarco-endoplasmic-reticulum-deliver-site-and-function-specific-calcium-signals
#18
REVIEW
A Mark Evans, Nicola Fameli, Oluseye A Ogunbayo, Jingxian Duan, Jorge Navarro-Dorado
Calcium signals determine, for example, smooth muscle contraction and changes in gene expression. How calcium signals select for these processes is enigmatic. We build on the "panjunctional sarcoplasmic reticulum" hypothesis, describing our view that different calcium pumps and release channels, with different kinetics and affinities for calcium, are strategically positioned within nanojunctions of the SR and help demarcate their respective cytoplasmic nanodomains. SERCA2b and RyR1 are preferentially targeted to the sarcoplasmic reticulum (SR) proximal to the plasma membrane (PM), i...
August 2016: Science China. Life Sciences
https://www.readbyqxmd.com/read/27375649/nod-factor-effects-on-root-hair-specific-transcriptome-of-medicago-truncatula-focus-on-plasma-membrane-transport-systems-and-reactive-oxygen-species-networks
#19
Isabelle Damiani, Alice Drain, Marjorie Guichard, Sandrine Balzergue, Alexandre Boscari, Jean-Christophe Boyer, Véronique Brunaud, Sylvain Cottaz, Corinne Rancurel, Martine Da Rocha, Cécile Fizames, Sébastien Fort, Isabelle Gaillard, Vincent Maillol, Etienne G J Danchin, Hatem Rouached, Eric Samain, Yan-Hua Su, Julien Thouin, Bruno Touraine, Alain Puppo, Jean-Marie Frachisse, Nicolas Pauly, Hervé Sentenac
Root hairs are involved in water and nutrient uptake, and thereby in plant autotrophy. In legumes, they also play a crucial role in establishment of rhizobial symbiosis. To obtain a holistic view of Medicago truncatula genes expressed in root hairs and of their regulation during the first hours of the engagement in rhizobial symbiotic interaction, a high throughput RNA sequencing on isolated root hairs from roots challenged or not with lipochitooligosaccharides Nod factors (NF) for 4 or 20 h was carried out...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27233469/calcium-dynamics-predict-direction-of-synaptic-plasticity-in-striatal-spiny-projection-neurons
#20
Joanna Jędrzejewska-Szmek, Sriraman Damodaran, Daniel B Dorman, Kim T Blackwell
The striatum is a major site of learning and memory formation for sensorimotor and cognitive association. One of the mechanisms used by the brain for memory storage is synaptic plasticity - the long lasting, activity-dependent change in synaptic strength. All forms of synaptic plasticity require an elevation in intracellular calcium, and a common hypothesis is that the amplitude and duration of calcium transients can determine the direction of synaptic plasticity. The utility of this hypothesis in the striatum is unclear in part because dopamine is required for striatal plasticity and in part because of the diversity in stimulation protocols...
May 27, 2016: European Journal of Neuroscience
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