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Calcium Sensor Receptor

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https://www.readbyqxmd.com/read/28299842/electroacupuncture-promotes-cns-dependent-release-of-mesenchymal-stem-cells
#1
Tatiana E Salazar, Matthew R Richardson, Eleni Beli, Matthew S Ripsch, John George, Youngsook Kim, Yaqian Duan, Leni Moldovan, Yuanqing Yan, Ashay Bhatwadekar, Vaishnavi Jadhav, Jared A Smith, Susan McGorray, Alicia L Bertone, Dmitri O Traktuev, Keith L March, Luis M Colon-Perez, Keith Avin, Emily Sims, Julie A Mund, Jamie Case, Shaolin Deng, Min Su Kim, Bruce McDavitt, Michael E Boulton, Jeffrey Thinschmidt, Sergio Li Calzi, Stephanie D Fitz, Robyn K Fuchs, Stuart J Warden, Todd McKinley, Anantha Shekhar, Marcelo Febo, Phillip L Johnson, Lung Ji Chang, Zhanguo Gao, Mikhail G Kolonin, Song Lai, Jinfeng Ma, Xinzhong Dong, Fletcher A White, Huisheng Xie, Mervin C Yoder, Maria B Grant
Electro-acupuncture (EA) performed in rats and humans using front-limb acupuncture sites, LI-4 and LI-11, and Du-14 and Du-20 increased functional connectivity between the anterior hypothalamus and the amygdala and mobilized mesenchymal stem cells (MSC) into the systemic circulation. In human subjects, the source of the MSC was found to be primarily adipose tissue whereas in rodents the tissue sources were considered more heterogeneous. Pharmacological disinhibition of rat hypothalamus enhanced sympathetic nervous system (SNS) activation and similarly resulted in a release of MSC into the circulation...
March 16, 2017: Stem Cells
https://www.readbyqxmd.com/read/28275088/calcium-sensor-ncs-1-promotes-tumor-aggressiveness-and-predicts-patient-survival
#2
Lauren M Moore, Allison England, Barbara E Ehrlich, David L Rimm
Neuronal Calcium Sensor 1 (NCS1) is a multi-functional Ca2+-binding protein that affects a range of cellular processes beyond those related to neurons. Functional characterization of NCS-1 in neuronal model systems suggests that NCS-1 may influence oncogenic processes. To this end, the biological role of NCS-1 was investigated by altering its endogenous expression in MCF-7 and MB-231 breast cancer (BCa) cells. Overexpression of NCS-1 resulted in a more aggressive tumor phenotype demonstrated by a marked increase in invasion and motility, and a decrease in cell-matrix adhesion to collagen IV...
March 8, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28220076/actions-and-mechanisms-of-polyunsaturated-fatty-acids-on-voltage-gated-ion-channels
#3
REVIEW
Fredrik Elinder, Sara I Liin
Polyunsaturated fatty acids (PUFAs) act on most ion channels, thereby having significant physiological and pharmacological effects. In this review we summarize data from numerous PUFAs on voltage-gated ion channels containing one or several voltage-sensor domains, such as voltage-gated sodium (NaV), potassium (KV), calcium (CaV), and proton (HV) channels, as well as calcium-activated potassium (KCa), and transient receptor potential (TRP) channels. Some effects of fatty acids appear to be channel specific, whereas others seem to be more general...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28220073/enhanced-late-na-and-ca-currents-as-effective-antiarrhythmic-drug-targets
#4
REVIEW
Hrayr S Karagueuzian, Arash Pezhouman, Marina Angelini, Riccardo Olcese
While recent advances clarified the molecular and cellular modes of action of antiarrhythmic drugs (AADs), their link to suppression of dynamical arrhythmia mechanisms remains only partially understood. The current classifications of AADs (Classes I, III, and IV) rely on blocking peak Na, K and L-type calcium currents (ICa,L), with Class II with dominant beta receptor blocking activity and Class V including drugs with diverse classes of actions. The discovery that the calcium and redox sensor, cardiac Ca/calmodulin-dependent protein kinase II (CaMKII) enhances both the late Na (INa-L) and the late ICa,L in patients at high risk of VT/VF provided a new and a rational AAD target...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28197074/the-first-extracellular-linker-is-important-for-several-aspects-of-the-gating-mechanism-of-human-trpa1-channel
#5
Lenka Marsakova, Ivan Barvik, Vlastimil Zima, Lucie Zimova, Viktorie Vlachova
Transient receptor potential ankyrin 1 (TRPA1) is an excitatory ion channel involved in pain, inflammation and itching. This channel gates in response to many irritant and proalgesic agents, and can be modulated by calcium and depolarizing voltage. While the closed-state structure of TRPA1 has been recently resolved, also having its open state is essential for understanding how this channel works. Here we use molecular dynamics simulations combined with electrophysiological measurements and systematic mutagenesis to predict and explore the conformational changes coupled to the expansion of the presumptive channel's lower gate...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28154149/the-coupling-between-ca-2-channels-and-the-exocytotic-ca-2-sensor-at-hair-cell-ribbon-synapses-varies-tonotopically-along-the-mature-cochlea
#6
Stuart L Johnson, Jennifer Olt, Soyoun Cho, Henrique von Gersdorff, Walter Marcotti
The cochlea processes auditory signals over a wide range of frequencies and intensities. However, the transfer characteristics at hair cell ribbon synapses are still poorly understood at different frequency locations along the cochlea. Using recordings from mature gerbils, we report here a surprisingly strong block of exocytosis by the slow Ca(2+) buffer EGTA (10 mM) in basal hair cells tuned to high frequencies (∼30 kHz). In addition, using recordings from gerbil, mouse, and bullfrog auditory organs, we find that the spatial coupling between Ca(2+) influx and exocytosis changes from nanodomain in low-frequency tuned hair cells (∼<2 kHz) to progressively more microdomain in high-frequency cells (∼>2 kHz)...
March 1, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28089266/trpc1-orai1-and-stim1-in-soce-friends-in-tight-spaces
#7
REVIEW
Indu S Ambudkar, Lorena Brito de Souza, Hwei Ling Ong
Store-operated calcium entry (SOCE) is a ubiquitous Ca(2+) entry pathway that is activated in response to depletion of ER-Ca(2+) stores and critically controls the regulation of physiological functions in miscellaneous cell types. The transient receptor potential canonical 1 (TRPC1) is the first member of the TRPC channel subfamily to be identified as a molecular component of SOCE. While TRPC1 has been shown to contribute to SOCE and regulate various functions in many cells, none of the reported TRPC1-mediated currents resembled ICRAC, the highly Ca(2+)-selective store-dependent current first identified in lymphocytes and mast cells...
December 30, 2016: Cell Calcium
https://www.readbyqxmd.com/read/28018229/the-calcium-sensing-receptor-and-the-parathyroid-past-present-future
#8
REVIEW
Arthur D Conigrave
Parathyroid hormone (PTH) defends the extracellular fluid from hypocalcemia and has powerful and well-documented actions on the skeleton and renal tubular system. To achieve a satisfactory stable plasma calcium level, the secretion of PTH, and the resulting serum PTH level, is titrated carefully to the prevailing plasma ionized Ca(2+) concentration via a Ca(2+) sensing mechanism that mediates feedback inhibition of PTH secretion. Herein, I consider the properties of the parathyroid Ca(2+) sensing mechanism, the identity of the Ca(2+) sensor, the intracellular biochemical mechanisms that it controls, the manner of its integration with other components of the PTH secretion control mechanism, and its modulation by other nutrients...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27999616/bioelectronic-nose-and-its-application-to-smell-visualization
#9
REVIEW
Hwi Jin Ko, Tai Hyun Park
There have been many trials to visualize smell using various techniques in order to objectively express the smell because information obtained from the sense of smell in human is very subjective. So far, well-trained experts such as a perfumer, complex and large-scale equipment such as GC-MS, and an electronic nose have played major roles in objectively detecting and recognizing odors. Recently, an optoelectronic nose was developed to achieve this purpose, but some limitations regarding the sensitivity and the number of smells that can be visualized still persist...
2016: Journal of Biological Engineering
https://www.readbyqxmd.com/read/27998200/spinal-cord-injury-leads-to-hyperoxidation-and-nitrosylation-of-skeletal-muscle-ryanodine-receptor-1-associated-with-upregulation-of-nicotinamide-adenine-dinucleotide-phosphate-oxidase-4
#10
Xin-Hua Liu, Lauren Harlow, Zachary A Graham, William A Bauman, Christopher Cardozo
Spinal cord injury (SCI) results in marked atrophy and dysfunction of skeletal muscle. There are currently no effective treatments for SCI-induced muscle atrophy or the dysfunction of the remaining muscle tissue. Nicotinamide adenine dinucleotide phosphate (NADPH) oxidase-4 (Nox4) produces reactive oxygen species (ROS) in sarcoplasmic reticulum (SR) and has been identified as an important O2 sensor in skeletal muscle. Ryanodine receptors (RyRs) are calcium (Ca(2+)) channels that are responsible for Ca(2+) release from SR...
February 27, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/27976413/medicinal-chemistry-pharmacology-and-clinical-implications-of-trpv1-receptor-antagonists
#11
REVIEW
Mojgan Aghazadeh Tabrizi, Pier Giovanni Baraldi, Stefania Baraldi, Stefania Gessi, Stefania Merighi, Pier Andrea Borea
Transient receptor potential vanilloid 1 (TRPV1) is an ion channel expressed on sensory neurons triggering an influx of cations. TRPV1 receptors function as homotetramers responsive to heat, proinflammatory substances, lipoxygenase products, resiniferatoxin, endocannabinoids, protons, and peptide toxins. Its phosphorylation increases sensitivity to both chemical and thermal stimuli, while desensitization involves a calcium-dependent mechanism resulting in receptor dephosphorylation. TRPV1 functions as a sensor of noxious stimuli and may represent a target to avoid pain and injury...
December 15, 2016: Medicinal Research Reviews
https://www.readbyqxmd.com/read/27943195/concurrent-imaging-of-receptor-trafficking-and-calcium-dynamics-by-spinning-disk-confocal-microscopy
#12
DeLaine D Larsen, Regina Wai-Yan Choy, Minjong Park
Synaptic activity is modulated by the activation of neuromodulator receptors present in dendrites of neurons. The majority of neuromodulator receptors are G protein coupled receptors (GPCRs), in which membrane trafficking regulates their activities. Membrane trafficking of neuromodulator receptors and their signaling occurs on a rapid time scale and emerging studies indicate that neuromodulator receptors function not just from the plasma membrane but also from the endocytic compartments. Here, we describe a live cell imaging approach using spinning disk confocal microscopy to investigate the effect of neuromodulator receptor activation on synaptic activity by measuring calcium dynamics in primary rat striatal neurons...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27941645/pathophysiological-significance-of-store-operated-calcium-entry-in-megakaryocyte-function-opening-new-paths-for-understanding-the-role-of-calcium-in-thrombopoiesis
#13
REVIEW
Christian A Di Buduo, Alessandra Balduini, Francesco Moccia
Store-Operated Calcium Entry (SOCE) is a universal calcium (Ca(2+)) influx mechanism expressed by several different cell types. It is now known that Stromal Interaction Molecule (STIM), the Ca(2+) sensor of the intracellular compartments, together with Orai and Transient Receptor Potential Canonical (TRPC), the subunits of Ca(2+) permeable channels on the plasma membrane, cooperate in regulating multiple cellular functions as diverse as proliferation, differentiation, migration, gene expression, and many others, depending on the cell type...
December 8, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27913210/trpv4-activation-of-endothelial-nitric-oxide-synthase-resists-nonalcoholic-fatty-liver-disease-by-blocking-cyp2e1-mediated-redox-toxicity
#14
Ratanesh K Seth, Suvarthi Das, Diptadip Dattaroy, Varun Chandrashekaran, Firas Alhasson, Gregory Michelotti, Mitzi Nagarkatti, Prakash Nagarkatti, Anna Mae Diehl, P Darwin Bell, Wolfgang Liedtke, Saurabh Chatterjee
NAFLD is a clinically progressive disease with steatosis, inflammation, endothelial dysfunction and fibrosis being the stages where clinical intervention becomes necessary. Lack of early biomarkers and absence of a FDA approved drug obstructs efforts for effective treatment. NAFLD progression is strongly linked to a balance between liver injury, tissue regeneration and the functioning of endogenous defense mechanisms. The failure of the defense pathways to resist the tissue damage arising from redox stress, one of the "multiple hits" in disease progression, give rise to heightened inflammation and occasional fibrosis...
January 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27913207/overexpression-of-stim1-in-neurons-in-mouse-brain-improves-contextual-learning-and-impairs-long-term-depression
#15
Łukasz Majewski, Filip Maciąg, Paweł M Boguszewski, Iga Wasilewska, Grzegorz Wiera, Tomasz Wójtowicz, Jerzy Mozrzymas, Jacek Kuznicki
STIM1 is an endoplasmic reticulum calcium sensor that is involved in several processes in neurons, including store-operated calcium entry. STIM1 also inhibits voltage-gated calcium channels, such as Cav1.2 and Cav3.1, and is thus considered a multifunctional protein. The aim of this work was to investigate the ways in which transgenic neuronal overexpression of STIM1 in FVB/NJ mice affects animal behavior and the electrophysiological properties of neurons in acute hippocampal slices. We overexpressed STIM1 from the Thy1...
November 29, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27906239/fiber-optic-electron-spin-resonance-thermometry-of-single-laser-activated-neurons
#16
A A Lanin, I V Fedotov, Yu G Ermakova, D A Sidorov-Biryukov, A B Fedotov, P Hemmer, V V Belousov, A M Zheltikov
Optically detected electron spin resonance in fiber-coupled nitrogen-vacancy (NV) centers of diamond is used to demonstrate a fiber-optic quantum thermometry of individual thermogenetically activated neurons. Laser-induced temperature variations read out from single neurons with the NV-diamond fiber sensor are shown to strongly correlate with the fluorescence of calcium-ion sensors, serving as online indicators of the inward Ca<sup>2+</sup> current across the cell membrane of neurons expressing transient receptor potential (TRP) cation channels...
December 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27906063/characterization-of-a-multiprotein-complex-involved-in-excitation-transcription-coupling-of-skeletal-muscle
#17
Manuel Arias-Calderón, Gonzalo Almarza, Alexis Díaz-Vegas, Ariel Contreras-Ferrat, Denisse Valladares, Mariana Casas, Héctor Toledo, Enrique Jaimovich, Sonja Buvinic
BACKGROUND: Electrical activity regulates the expression of skeletal muscle genes by a process known as "excitation-transcription" (E-T) coupling. We have demonstrated that release of adenosine 5'-triphosphate (ATP) during depolarization activates membrane P2X/P2Y receptors, being the fundamental mediators between electrical stimulation, slow intracellular calcium transients, and gene expression. We propose that this signaling pathway would require the proper coordination between the voltage sensor (dihydropyridine receptor, DHPR), pannexin 1 channels (Panx1, ATP release conduit), nucleotide receptors, and other signaling molecules...
April 11, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27896810/multiple-pathways-for-elevating-extracellular-adenosine-in-the-rat-hippocampal-ca1-region-characterized-by-adenosine-sensor-cells
#18
Kunihiko Yamashiro, Yuki Fujii, Shohei Maekawa, Mitsuhiro Morita
Extracellular adenosine in the brain, which modulates various physiological and pathological processes, fluctuates in a complicated manner that reflects the circadian cycle, neuronal activity, metabolism, and disease states. The dynamics of extracellular adenosine in the brain are not fully understood, largely because of the lack of simple and reliable methods of measuring time-dependent changes in tissue adenosine distribution. This study describes the development of a biosensor, designated an adenosine sensor cell, expressing adenosine A1 receptor, and a genetically modified G protein...
January 2017: Journal of Neurochemistry
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
#19
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/27821621/dopamine-d1a-directly-interacts-with-otoferlin-synaptic-pathway-proteins-ca2-and-phosphorylation-underlie-an-nsf-to-ap2mu1-molecular-switch
#20
Dakshnamurthy Selvakumar, Marian J Drescher, Nathan A Deckard, Neeliyath A Ramakrishnan, Barbara J Morley, Dennis G Drescher
Dopamine receptors regulate exocytosis via protein-protein interactions (PPIs) as well as via adenylyl cyclase transduction pathways. Evidence has been obtained for PPIs in inner ear hair cells coupling D1A to soluble N-ethylmaleimide-sensitive factor (NSF) attachment protein receptor (SNARE)-related proteins snapin, otoferlin, N-ethylmaleimide-sensitive factor (NSF), and adaptor-related protein complex 2, mu 1 (AP2mu1), dependent on [Ca(2+)] and phosphorylation. Specifically, the carboxy terminus of dopamine D1A was found to directly bind t-SNARE-associated protein snapin in teleost and mammalian hair cell models by yeast two-hybrid (Y2H) and pull-down assays, and snapin directly interacts with hair cell calcium-sensor otoferlin...
January 1, 2017: Biochemical Journal
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