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calcium channel pumps

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https://www.readbyqxmd.com/read/28684623/calcium-and-excitation-contraction-coupling-in-the-heart
#1
REVIEW
David A Eisner, Jessica L Caldwell, Kornél Kistamás, Andrew W Trafford
Cardiac contractility is regulated by changes in intracellular Ca concentration ([Ca(2+)]i). Normal function requires that [Ca(2+)]i be sufficiently high in systole and low in diastole. Much of the Ca needed for contraction comes from the sarcoplasmic reticulum and is released by the process of calcium-induced calcium release. The factors that regulate and fine-tune the initiation and termination of release are reviewed. The precise control of intracellular Ca cycling depends on the relationships between the various channels and pumps that are involved...
July 7, 2017: Circulation Research
https://www.readbyqxmd.com/read/28675986/clinical-determinants-of-clopidogrel-responsiveness-in-a-heterogeneous-cohort-of-puerto-rican-hispanics
#2
Dagmar F Hernandez-Suarez, Stuart A Scott, Matthew I Tomey, Kyle Melin, Angel Lopez-Candales, Charlotte E Buckley, Jorge Duconge
BACKGROUND: Clopidogrel is by far the most prescribed platelet adenosine diphosphate (ADP) antagonist in Puerto Rico despite the advent of newer agents (prasugrel and ticagrelor). Given the paucity of data on clopidogrel responsiveness in Hispanics, we sought to determine the association between clinical characteristics and platelet reactivity in Puerto Rican patients on clopidogrel therapy. STUDY POPULATION: A total of 100 Puerto Rican patients on clopidogrel therapy were enrolled and allocated into two groups: Group I, without high on-treatment platelet reactivity (HTPR); and Group II, with HTPR...
July 1, 2017: Therapeutic Advances in Cardiovascular Disease
https://www.readbyqxmd.com/read/28674077/physicians-are-more-likely-than-non-physicians-to-use-brand-name-drugs-to-treat-their-chronic-conditions
#3
REVIEW
Mariana Carrera, Niels Skipper
BACKGROUND: Little is known about the treatments physicians choose for themselves compared with how they treat their patients. We determine if physicians prescribe different treatments to patients than to themselves. METHODS: Population-based cohort study from 2004 to 2012 examining prescription claims of all Danish primary care physicians (PCP; n=3088) and all other Danish adults (n=2 334 590) who received a first-time prescription from a PCP for a statin (n=455 586), calcium channel blocker (CCB, n=330 369), serotonin-norepinephrine/selective serotonin reuptake inhibitors (SN/SSRIs, n=423 740), proton pump inhibitor (PPI, n=671 965) or antihistamine (n=456 018)...
July 3, 2017: Journal of Epidemiology and Community Health
https://www.readbyqxmd.com/read/28655649/interregional-electro-mechanical-heterogeneity-in-the-rabbit-myocardium
#4
REVIEW
Franz F Dressler, Ilona Bodi, Marius Menza, Robin Moss, Heiko Bugger, Christoph Bode, Jan C Behrends, Gunnar Seemann, Katja E Odening
BACKGROUND: Increased electrical heterogeneity has been causatively linked to arrhythmic disorders, yet the knowledge about physiological heterogeneity remains incomplete. This study investigates regional electro-mechanical heterogeneities in rabbits, one of the key animal models for arrhythmic disorders. METHODS AND FINDINGS: 7 wild-type rabbits were examined by phase-contrast magnetic resonance imaging in vivo to assess cardiac wall movement velocities. Using a novel data-processing algorithm regional contraction-like profiles were calculated...
June 24, 2017: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/28653722/porous-pdms-structures-for-the-storage-and-release-of-aqueous-solutions-into-fluidic-environments
#5
Peter Thurgood, Sara Baratchi, Crispin Szydzik, Arnan Mitchell, Khashayar Khoshmanesh
Typical microfluidic systems take advantage of multiple storage reservoirs, pumps and valves for the storage, driving and release of buffers and other reagents. However, the fabrication, integration, and operation of such components can be difficult. In particular, the reliance of such components on external off-chip equipment limits their utility for creating self-sufficient, stand-alone microfluidic systems. Here, we demonstrate a porous sponge made of polydimethylsiloxane (PDMS), which is fabricated by templating microscale water droplets using a T-junction microfluidic structure...
June 27, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28618338/markolab-a-simulator-to-study-ionic-channel-s-stochastic-behavior
#6
Robson Rodrigues da Silva, Daniel Gustavo Goroso, Donald M Bers, José Luis Puglisi
Mathematical models of the cardiac cell have started to include markovian representations of the ionic channels instead of the traditional Hodgkin & Huxley formulations. There are many reasons for this: Markov models are not restricted to the idea of independent gates defining the channel, they allow more complex description with specific transitions between open, closed or inactivated states, and more importantly those states can be closely related to the underlying channel structure and conformational changes...
June 12, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28603004/ion-channel-signaling-influences-cellular-proliferation-and-phagocyte-activity-during-axolotl-tail-regeneration
#7
Brandon M Franklin, S Randal Voss, Jeffrey L Osborn
Little is known about the potential for ion channels to regulate cellular behaviors during tissue regeneration. Here, we utilized an amphibian tail regeneration assay coupled with a chemical genetic screen to identify ion channel antagonists that altered critical cellular processes during regeneration. Inhibition of multiple ion channels either partially (anoctamin1/Tmem16a, anoctamin2/Tmem16b, KV2.1, KV2.2, L-type CaV channels and H/K ATPases) or completely (GlyR, GABAAR, KV1.5 and SERCA pumps) inhibited tail regeneration...
August 2017: Mechanisms of Development
https://www.readbyqxmd.com/read/28575719/fast-and-slow-ca-2-dependent-hyperpolarization-mechanisms-connect-membrane-potential-and-sleep-homeostasis
#8
REVIEW
Koji L Ode, Takahiro Katsumata, Daisuke Tone, Hiroki R Ueda
Several lines of evidence indicate that the sleep-wake state of cortical neurons is regulated not only through neuronal projections from the lower brain, but also through the cortical neurons' intrinsic ability to initiate a slow firing pattern related to the slow-wave oscillation observed in electroencephalography of the sleeping brain. Theoretical modeling and experiments with genetic and pharmacological perturbation suggest that ion channels and kinases acting downstream of calcium signaling regulate the cortical-membrane potential and sleep duration...
June 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28542952/compensatory-and-decompensatory-alterations-in-cardiomyocyte-ca-2-dynamics-in-hearts-with-diastolic-dysfunction-following-aortic-banding
#9
Sara Gattoni, Åsmund Treu Røe, Jan Magnus Aronsen, Ivar Sjaastad, William E Louch, Nicolas P Smith, Steven A Niederer
KEY POINTS: At the cellular level cardiac hypertrophy causes remodelling, leading to changes in ionic channel, pump and exchanger densities and kinetics. Previous studies have focused on quantifying changes in channels, pumps and exchangers without quantitatively linking these changes with emergent cellular scale functionality. Two biophysical cardiac cell models were created, parameterized and validated and are able to simulate electrophysiology and calcium dynamics in myocytes from control sham operated rats and aortic-banded rats exhibiting diastolic dysfunction...
June 15, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28506097/a-computational-model-of-the-ca-2-transients-and-influence-of-buffering-in-guinea-pig-urinary-bladder-smooth-muscle-cells
#10
Vijay Dave, Rohit Manchanda
Many cellular events including electrical activity and muscle contraction are regulated and coordinated by intracellular [Formula: see text] concentration ([[Formula: see text]][Formula: see text]. In detrusor smooth muscle (DSM) cells, [[Formula: see text]]i is normally maintained at very low levels and rises transiently during signalling processes as a result of (i) influx from the extracellular space (mainly via L-type and T-type [Formula: see text] channels) and (ii) [Formula: see text] release from sarcoplasmic reticulum (SR) into the cytoplasm...
April 20, 2017: Journal of Bioinformatics and Computational Biology
https://www.readbyqxmd.com/read/28449186/the-risk-of-lower-gastrointestinal-bleeding-in-low-dose-aspirin-users
#11
W-C Chen, K-H Lin, Y-T Huang, T-J Tsai, W-C Sun, S-K Chuah, D-C Wu, P-I Hsu
BACKGROUND: Aspirin increases the risk of gastrointestinal bleeding. AIM: To investigate the risk of lower gastrointestinal bleeding (LGIB) in aspirin users. METHODS: Low-dose (75-325 mg daily) aspirin users and controls matched by age, gender and enrollment time in a 1:5 ratio were selected from 1 million randomly sampled subjects in the National Health Insurance Research Database of Taiwan. Cox proportional hazard regression models were developed to evaluate the predictors of LGIB with adjustments for age, gender, comorbidities including coronary artery disease, ischaemic stroke, diabetes, hypertension, chronic kidney disease, liver cirrhosis, chronic obstructive pulmonary disease, dyslipidemia, uncomplicated peptic ulcer disease, history of peptic ulcer bleeding, and concomitant use of clopidogrel, ticlopidine, warfarin, nonsteroidal anti-inflammatory drugs (NSAIDs), cyclooxygenase-2 inhibitors, steroids, proton pump inhibitors (PPIs), histamine-2 receptor antagonists (H2RAs), nitrates, alendronate, selective serotonin reuptake inhibitors (SSRIs) and calcium channel blockers...
April 27, 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28448473/transcriptomic-analysis-of-calcium-remodeling-in-colorectal-cancer
#12
Enrique Pérez-Riesgo, Lucía G Gutiérrez, Daniel Ubierna, Alberto Acedo, Mary P Moyer, Lucía Núñez, Carlos Villalobos
Colorectal cancer (CRC) cells undergo the remodeling of intracellular Ca(2+) homeostasis, which contributes to cancer hallmarks such as enhanced proliferation, invasion and survival. Ca(2+) remodeling includes critical changes in store-operated Ca(2+) entry (SOCE) and Ca(2+) store content. Some changes have been investigated at the molecular level. However, since nearly 100 genes are involved in intracellular Ca(2+) transport, a comprehensive view of Ca(2+) remodeling in CRC is lacking. We have used Next Generation Sequencing (NGS) to investigate differences in expression of 77 selected gene transcripts involved in intracellular Ca(2+) transport in CRC...
April 27, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28424094/electrical-control-of-calcium-oscillations-in-mesenchymal-stem-cells-using-microsecond-pulsed-electric-fields
#13
Hanna Hanna, Franck M Andre, Lluis M Mir
BACKGROUND: Human mesenchymal stem cells are promising tools for regenerative medicine due to their ability to differentiate into many cellular types such as osteocytes, chondrocytes and adipocytes amongst many other cell types. These cells present spontaneous calcium oscillations implicating calcium channels and pumps of the plasma membrane and the endoplasmic reticulum. These oscillations regulate many basic functions in the cell such as proliferation and differentiation. Therefore, the possibility to mimic or regulate these oscillations might be useful to regulate mesenchymal stem cells biological functions...
April 20, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28400815/delayed-treatment-of-secondary-degeneration-following-acute-optic-nerve-transection-using-a-combination-of-ion-channel-inhibitors
#14
Nathanael J Yates, Marcus K Giacci, Ryan L O'Hare Doig, Wissam Chiha, Bethany E Ashworth, Jade Kenna, Carole A Bartlett, Melinda Fitzgerald
Studies have shown that a combined application of several ion channel inhibitors immediately after central nervous system injury can inhibit secondary degeneration. However, for clinical use, it is necessary to determine how long after injury the combined treatment of several ion channel inhibitors can be delayed and efficacy maintained. In this study, we delivered Ca(2+) entry-inhibiting P2X7 receptor antagonist oxidized-ATP and AMPA receptor antagonist YM872 to the optic nerve injury site via an iPRECIO(@) pump immediately, 6 hours, 24 hours and 7 days after partial optic nerve transection surgery...
February 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/28367140/transcriptomics-indicates-active-and-passive-metronidazole-resistance-mechanisms-in-three-seminal-giardia-lines
#15
Brendan R E Ansell, Louise Baker, Samantha J Emery, Malcolm J McConville, Staffan G Svärd, Robin B Gasser, Aaron R Jex
Giardia duodenalis is an intestinal parasite that causes 200-300 million episodes of diarrhoea annually. Metronidazole (Mtz) is a front-line anti-giardial, but treatment failure is common and clinical resistance has been demonstrated. Mtz is thought to be activated within the parasite by oxidoreductase enzymes, and to kill by causing oxidative damage. In G. duodenalis, Mtz resistance involves active and passive mechanisms. Relatively low activity of iron-sulfur binding proteins, namely pyruvate:ferredoxin oxidoreductase (PFOR), ferredoxins, and nitroreductase-1, enable resistant cells to passively avoid Mtz activation...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28356049/calcium-engaged-mechanisms-of-nongenomic-action-of-neurosteroids
#16
Elzbieta Rebas, Tomasz Radzik, Tomasz Boczek, Ludmila Zylinska
Among hundreds of molecules affecting variety of neuronal processes, neurosteroids form the unique group because of their dual mechanism of action. Classically, they bind to intracellular and/or nuclear receptors, and next modify gene transcription. Another mode of action is linked with the rapid effects induced at the plasma membrane level within seconds or milliseconds. The negative and positive modulations have been documented for GABAA receptor complex, glycine receptor, NMDA receptor, AMPA receptor, G protein-coupled receptors and sigma-1 receptor, as well as for several membrane ion channels and plasma membrane enzymes...
March 28, 2017: Current Neuropharmacology
https://www.readbyqxmd.com/read/28326532/common-drug-side-effects-and-drug-drug-interactions-in-elderly-adults-in-primary-care
#17
Susan E Merel, Douglas S Paauw
Prescribing medications, recognizing and managing medication side effects and drug interactions, and avoiding polypharmacy are all essential skills in the care of older adults in primary care. Important side effects of medications commonly prescribed in older adults (statins, proton pump inhibitors, trimethoprim-sulfamethoxazole and fluoroquinolone antibiotics, zolpidem, nonsteroidal antiinflammatory drugs, selective serotonin reuptake inhibitors, dipeptidyl peptidase 4 inhibitors) were reviewed. Important drug interactions with four agents or classes (statins, warfarin, factor Xa inhibitors, and calcium channel blockers) are discussed...
July 2017: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/28269645/development-of-a-detailed-model-of-calcium-dynamics-at-the-postsynaptic-spine-of-an-excitatory-synapse
#18
Eric Y Hu, Jean-Marie C Bouteiller, Dong Song, Theodore W Berger
Postsynaptic calcium dynamics play a critical role in synaptic plasticity, but are often difficult to measure in experimental protocols due to their relatively fast rise and decay times, and the small spine dimensions. To circumvent these limitations, we propose to develop a computational model of calcium dynamics in the postsynaptic spine. This model integrates the main elements that participate in calcium concentration influx, efflux, diffusion and buffering. These consist of (i) spine geometry; (ii) calcium influx through NMDA receptors and voltage-dependent calcium channels (VDCC); (iii) calcium efflux with plasma membrane calcium pumps (PMCA) and sodium-calcium exchangers (NCX); (iv) intracellular calcium stores; and (v) calcium buffers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28249687/activation-of-endoplasmic-reticulum-calcium-leak-by-2-apb-depends-on-the-luminal-calcium-concentration
#19
Daniel Leon-Aparicio, Jesus Chavez-Reyes, Agustin Guerrero-Hernandez
It has been shown that 2-APB is a nonspecific modulator of ion channel activity, while most of the channels are inhibited by this compound, there are few examples of channels that are activated by 2-APB. Additionally, it has been shown that, 2-APB leads to a reduction in the luminal endoplasmic reticulum Ca(2+) level ([Ca(2+)]ER) and we have carried out simultaneous recordings of both [Ca(2+)]i and the [Ca(2+)]ER in HeLa cell suspensions to assess the mechanism involved in this effect. This approach allowed us to determine that 2-APB induces a reduction in the [Ca(2+)]ER by activating an ER-resident Ca(2+) permeable channel more than by inhibiting the activity of SERCA pumps...
July 2017: Cell Calcium
https://www.readbyqxmd.com/read/28227903/development-of-a-detailed-model-of-calcium-dynamics-at-the-postsynaptic-spine-of-an-excitatory-synapse
#20
Eric Y Hu, Jean-Marie C Bouteiller, Dong Song, Theodore W Berger, Eric Y Hu, Jean-Marie C Bouteiller, Dong Song, Theodore W Berger, Jean-Marie C Bouteiller, Eric Y Hu, Dong Song, Theodore W Berger
Postsynaptic calcium dynamics play a critical role in synaptic plasticity, but are often difficult to measure in experimental protocols due to their relatively fast rise and decay times, and the small spine dimensions. To circumvent these limitations, we propose to develop a computational model of calcium dynamics in the postsynaptic spine. This model integrates the main elements that participate in calcium concentration influx, efflux, diffusion and buffering. These consist of (i) spine geometry; (ii) calcium influx through NMDA receptors and voltage-dependent calcium channels (VDCC); (iii) calcium efflux with plasma membrane calcium pumps (PMCA) and sodium-calcium exchangers (NCX); (iv) intracellular calcium stores; and (v) calcium buffers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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