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Intracellular calcium

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https://www.readbyqxmd.com/read/28109749/glycosylation-of-voltage-gated-calcium-channels-in-health-and-disease
#1
REVIEW
Joanna Lazniewska, Norbert Weiss
Voltage-gated calcium channels (VGCCs) are transmembrane proteins that translate electrical activities into intracellular calcium elevations and downstream signaling pathways. They serve essential physiological functions including communication between nerve cells, muscle contraction, cardiac activity, and release of hormones and neurotransmitters. Asparagine-linked glycosylation has emerged as an essential post-translational modification to control the number of channels embedded in the plasma membrane but also their functional gating properties...
January 18, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28109159/activity-dependent-regulation-of-t-type-calcium-channels-by-submembrane-calcium-ions
#2
Magali Cazade, Isabelle Bidaud, Philippe Lory, Jean Chemin
Voltage-gated Ca(2+) channels are involved in numerous physiological functions and various mechanisms finely tune their activity, including the Ca(2+) ion itself. This is well exemplified by the Ca(2+)-dependent inactivation of L-type Ca(2+) channels, whose alteration contributes to the dramatic disease Timothy Syndrome. For T-type Ca(2+) channels, a long-held view is that they are not regulated by intracellular Ca(2+). Here we challenge this notion by using dedicated electrophysiological protocols on both native and expressed T-type Ca(2+) channels...
January 21, 2017: ELife
https://www.readbyqxmd.com/read/28105751/stim-1-and-orai-1-channel-mediate-angiotensin-ii-induced-expression-of-egr-1-in-vascular-smooth-muscle-cells
#3
Estelle R Simo-Cheyou, Ju Jing Tan, Ryszard Grygorczyk, Ashok K Srivastava
An upregulation of Egr-1 expression has been reported in models of atherosclerosis and intimal hyperplasia and, various vasoactive peptides and growth promoting stimuli have been shown to induce the expression of Egr-1 in vascular smooth muscle cells (VSMC). Angiotensin-II (Ang-II) is a key vasoactive peptide that has been implicated in the pathogenesis of vascular diseases. Ang-II elevates intracellular Ca(2+) through activation of the store-operated calcium entry (SOCE) involving an inositol-3-phosphate receptor (IP3R)-coupled depletion of endoplasmic reticular Ca(2+) and a subsequent activation of the stromal interaction molecule 1 (STIM-1) /Orai-1 complex...
January 20, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28105734/calcium-calmodulin-dependent-protein-kinase-mediates-the-intracellular-signaling-pathways-of-cardiac-apoptosis-in-mice-with-impaired-glucose-tolerance
#4
Marilen Federico, Enrique L Portiansky, Leandro Sommese, Francisco J Alvarado, Paula G Blanco, Carolina N Zanuzzi, John Dedman, Marcia Kaetzel, Xander H T Wehrens, Alicia Mattiazzi, Julieta Palomeque
Background The impact of cardiac apoptosis in pre-diabetic stages of diabetic cardiomyopathy is unknown. We described that myocytes from fructose-rich diet (FRD) animals exhibit arrhythmias produced by exacerbated Ca(2+) /calmodulin-protein kinase (CaMKII) activity, ryanodine receptors (RyR2) phosphorylation and sarcoplasmic reticulum (SR) Ca(2+) leak. We tested the hypothesis that this mechanism also underlies cardiac apoptosis in pre-diabetes. Methods and Results We generated a pre-diabetic model in mice fed with FRD...
January 20, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28104436/capsaicin-synergizes-with-camptothecin-to-induce-increased-apoptosis-in-human-small-cell-lung-cancers-via-the-calpain-pathway
#5
Jamie R Friedman, Haley E Perry, Kathleen C Brown, Yin Gao, Ju Lin, Cathyrn D Stevenson, John D Hurley, Nicholas A Nolan, Austin T Akers, Yi Charlie Chen, Krista L Denning, Linda G Brown, Piyali Dasgupta
Small cell lung cancer (SCLC) is characterized by excellent initial response to chemotherapy and radiation therapy with a majority of the patients showing tumor shrinkage and even remission. However, the challenge with SCLC therapy is that patients inevitably relapse and subsequently do not respond to the first line treatment. Recent clinical studies have investigated the possibility of camptothecin-based combination therapy as first line treatment for SCLC patients. Conventionally, camptothecin is used for recurrent SCLC and has poor survival outcomes...
January 16, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28102477/potential-new-mechanisms-of-pro-arrhythmia-in-arrhythmogenic-cardiomyopathy-focus-on-calcium-sensitive-pathways
#6
REVIEW
C J M van Opbergen, M Delmar, T A B van Veen
Arrhythmogenic cardiomyopathy, or its most well-known subform arrhythmogenic right ventricular cardiomyopathy (ARVC), is a cardiac disease mainly characterised by a gradual replacement of the myocardial mass by fibrous and fatty tissue, leading to dilatation of the ventricular wall, arrhythmias and progression towards heart failure. ARVC is commonly regarded as a disease of the intercalated disk in which mutations in desmosomal proteins are an important causative factor. Interestingly, the Dutch founder mutation PLN R14Del has been identified to play an additional, and major, role in ARVC patients within the Netherlands...
January 19, 2017: Netherlands Heart Journal
https://www.readbyqxmd.com/read/28102470/neuronal-ryanodine-receptors-in-development-and-aging
#7
REVIEW
Nawaf Abu-Omar, Jogita Das, Vivian Szeto, Zhong-Ping Feng
Ryanodine receptors (RyRs) are intracellular calcium-release channels found on the endoplasmic reticulum of all cells. All three RyR isoforms, RyR1-3, are expressed in the brain, with RyR2 predominating. RyRs are localized within the soma, axons, dendritic spines, and presynaptic terminals of neurons. RyRs are highly expressed in the cerebellum, hippocampus, olfactory region, basal ganglia, and cerebral cortex. During the physiological processes of development and aging, the intracellular calcium homeostasis is largely regulated by RyRs...
January 19, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28101344/evaluation-of-pharmacological-relaxation-effect-of-the-natural-product-naringin-on-in-vitro-cultured-airway-smooth-muscle-cells-and-in-vivo-ovalbumin-induced-asthma-balb-c-mice
#8
Yue Wang, Yun Lu, Mingzhi Luo, Xiaohao Shi, Yan Pan, Huilong Zeng, Linhong Deng
Asthma has become a common chronic respiratory disease worldwide and its prevalence is predicted to continue increasing in the next decade, particularly in developing countries. A key component in asthma therapy is to alleviate the excessive bronchial airway narrowing ultimately due to airway smooth muscle contraction, which is often facilitated by a smooth muscle relaxant, such as the β2-adrenergic agonists. Recently, bitter taste receptor (TAS2R) agonists, including saccharin and chloroquine, have been found to potently relax the airway smooth muscle cells (ASMCs) via intracellular Ca(2+) signaling...
December 2016: Biomedical Reports
https://www.readbyqxmd.com/read/28100346/-impact-of-cd137-cd137l-signaling-mediated-exocytosis-of-autophagosome-within-vascular-smooth-muscle-cells-on-the-formation-of-atherosclerotic-calcification
#9
B Li, X Y Li, W Zhong, C Shao, Z Q Wang, W Yuan, J C Yan
Objective: To explore whether CD137-CD137L signaling mediated exocytosis of autophagosome within vascular smooth muscle cells (VSMCs) could influence the formation of atherosclerotic calcification. Methods: Fifteen 8-week-old male ApoE(-/-)(C57BL/6J-KO) mice fed with high fat diet for 5 weeks were randomly divided into three groups by using stochastic indicator method as follows: control group, n=5; agonist-CD137 group: agonist-CD137 antibody 200 μg/2 weeks for 4 weeks, ip, n=5; anti-CD137 group: 200 μg anti-CD137 antibody+ 200 μg agonist-CD137 antibody/2 weeks for 4 weeks, ip, n=5...
January 25, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/28098926/relevance-of-osteoclast-specific-enzyme-activities-in-cell-based-in-vitro-resorption-assays
#10
A Bernhardt, K Koperski, M Schumacher, M Gelinsky
Cell-based in vitro resorption assays are an important tool to simulate the in vivo biodegradation of resorbable bone graft materials and to predict their clinical performance. The present study analyses the activity of osteoclast-specific enzymes as potential surrogate measures for classical pit assay, which is not applicable on irregular structured materials. Osteoclasts derived from human peripheral blood mononuclear cells were cultivated on different surfaces: calcium phosphate bone cements (CPC), dentin discs, osteoblast-derived extracellular matrix (ECM) and tissue culture polystyrene as control...
January 18, 2017: European Cells & Materials
https://www.readbyqxmd.com/read/28098409/trpv4-contributes-to-resting-membrane-potential-in-retinal-m%C3%A3-ller-cells-implications-in-cell-volume-regulation
#11
Vanina Netti, Juan Fernández, Maia Kalstein, Alejandro Pizzoni, Gisela Di Giusto, Valeria Rivarola, Paula Ford, Claudia Capurro
Neural activity alters osmotic gradients favoring cell swelling in retinal Müller cells. This swelling is followed by a regulatory volume decrease (RVD), partially mediated by an efflux of KCl and water. The transient receptor potential channel 4 (TRPV4), a nonselective calcium channel, has been proposed as a candidate for mediating intracellular Ca(2+) elevation induced by swelling. We previously demonstrated in a human Müller cell line (MIO-M1) that RVD strongly depends on ion channel activation and, consequently, on membrane potential (Vm )...
January 18, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28097645/bacterial-subversion-of-camp-signalling-inhibits-cathelicidin-expression-which-is-required-for-innate-resistance-to-mycobacterium-tuberculosis
#12
Shashank Gupta, Kathryn Winglee, Richard Gallo, William R Bishai
Antimicrobial peptides such as cathelicidins are an important component of innate immune defence against inhaled microorganisms and have demonstrated antimicrobial activity against Mycobacterium tuberculosis with in vitro models. Despite this, little is known about the regulation and expression of cathelicidin during tuberculosis in vivo. We sought to determine whether the cathelicidin-related antimicrobial peptide (Cramp) gene, the murine functional homologue of the human cathelicidin gene (CAMP or LL-37), is required for regulating protective immunity during M...
January 18, 2017: Journal of Pathology
https://www.readbyqxmd.com/read/28097631/force-dependent-calcium-signaling-and-its-pathway-of-human-neutrophils-on-p-selectin-in-flow
#13
Bing Huang, Yingchen Ling, Jiangguo Lin, Xin Du, Ying Fang, Jianhua Wu
P-selectin engagement of P-selectin glycoprotein ligand-1 (PSGL-1) causes circulating leukocytes to roll on and adhere to the vascular surface, and mediates intracellular calcium flux, a key but unclear event for subsequent arresting firmly at and migrating into the infection or injured tissue. Using a parallel plate flow chamber technique and intracellular calcium ion detector (Fluo-4 AM), the intracellular calcium flux of firmly adhered neutrophils on immobilized P-selectin in the absence of chemokines at various wall shear stresses was investigated here in real time by fluorescence microscopy...
January 18, 2017: Protein & Cell
https://www.readbyqxmd.com/read/28096238/activation-of-trpa1-channel-by-antibacterial-agent-triclosan-induces-vegf-secretion-in-human-prostate-cancer-stromal-cells
#14
Sandra Derouiche, Pascal Mariot, Marine Warnier, Eric Vancauwenberghe, Gabriel Bidaux, Pierre Gosset, Brigitte Mauroy, Jean-Louis Bonnal, Christian Slomianny, Philippe Delcourt, Etienne Dewailly, Natalia Prevarskaya, Morad Roudbaraki
Accruing evidence indicates that exposure to environmental compounds may adversely impact human health and promote carcinogenesis. Triclosan (TCS), an antimicrobial agent widely used as a preservative in personal care products, has been shown to act as an endocrine disruptor in hormone-dependent tissues. Here we demonstrate a new molecular mechanism by which TCS stimulates the secretion by human prostate cancer stromal cells of Vascular Endothelial Growth Factor (VEGF), a factor known to promote tumour growth...
January 17, 2017: Cancer Prevention Research
https://www.readbyqxmd.com/read/28095896/screening-for-potential-genes-associated-with-bone-overgrowth-after-mid-shaft-femur-fracture-in-a-rat-model
#15
Chibing Liu, Yanting Liu, Weizhong Zhang, Xiuxin Liu
BACKGROUND: We investigated the underlying molecular mechanisms of bone overgrowth after femoral fracture by using high-throughput bioinformatics approaches. METHODS: The gene expression profile of GSE3298 (accession number) was obtained from the Gene Expression Omnibus database. Sixteen femoral growth plate samples, including nine samples without fracture and seven fracture samples for seven time points, were used for analysis. The Limma package was applied to identify differentially expressed genes (DEGs) between fractured and intact samples...
January 17, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28093548/astrocytic-control-of-synaptic-function
#16
REVIEW
Thomas Papouin, Jaclyn Dunphy, Michaela Tolman, Jeannine C Foley, Philip G Haydon
Astrocytes intimately interact with synapses, both morphologically and, as evidenced in the past 20 years, at the functional level. Ultrathin astrocytic processes contact and sometimes enwrap the synaptic elements, sense synaptic transmission and shape or alter the synaptic signal by releasing signalling molecules. Yet, the consequences of such interactions in terms of information processing in the brain remain very elusive. This is largely due to two major constraints: (i) the exquisitely complex, dynamic and ultrathin nature of distal astrocytic processes that renders their investigation highly challenging and (ii) our lack of understanding of how information is encoded by local and global fluctuations of intracellular calcium concentrations in astrocytes...
March 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28093527/human-cystic-fibrosis-macrophages-have-defective-calcium-dependent-protein-kinase-c-activation-of-the-nadph-oxidase-an-effect-augmented-by-burkholderia-cenocepacia
#17
Kaivon Assani, Chandra L Shrestha, Frank Robledo-Avila, Murugesan V Rajaram, Santiago Partida-Sanchez, Larry S Schlesinger, Benjamin T Kopp
Macrophage intracellular pathogen killing is defective in cystic fibrosis (CF), despite abundant production of reactive oxygen species (ROS) in lung tissue. Burkholderia species can cause serious infection in CF and themselves affect key oxidase components in murine non-CF cells. However, it is unknown whether human CF macrophages have an independent defect in the oxidative burst and whether Burkholderia contributes to this defect in terms of assembly of the NADPH oxidase complex and subsequent ROS production...
January 16, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28093238/a-model-of-the-mitochondrial-basis-of-bipolar-disorder
#18
REVIEW
Gerwyn Morris, Ken Walder, Sean L McGee, Olivia M Dean, Susannah J Tye, Michael Maes, Michael Berk
BACKGROUND: Bipolar disorder phenomenologically is a biphasic disorder of energy availability; increased in mania and decreased in depression. In consort, there is accumulating evidence indicating increased mitochondrial respiration and ATP production in bipolar mania which contrasts with decreased mitochondrial function in patients in the euthymic or depressive phase of the illness. Consequently, the central thesis of this paper is that bipolar disorder is due to a phasic dysregulation of mitochondrial biogenergetics...
January 14, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28092500/a-model-of-a-synthetic-biological-communication-interface-between-mammalian-cells-and-mechatronic-systems
#19
Keith C Heyde, Warren C Ruder
The creation of communication interfaces between abiotic and biotic systems represents a significant research challenge. In this work, we design and model a system linking the biochemical signaling pathways of mammalian cells to the actions of a mobile robotic prosthesis. We envision this system as a robotic platform carrying an optically monitored bioreactor that harbors mammalian cells. The cellular, optical signal is captured by an onboard fluorescent microscope and converted into an electronic signal. We first present a design for the overall cell-robot system, with a specific focus on the design of the synthetic gene networks needed for the system...
December 2016: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/28091657/zinc-transport-and-the-inhibition-of-the-l-type-calcium-channel-are-two-separable-functions-of-znt-1
#20
Eden Shusterman, Ofer Beharier, Shiri Levy, Raz Zarivach, Yoram Etzion, Craig R Campbell, Il-Ha Lee, Anuwat Dinudom, David I Cook, Asher Peretz, Amos Katz, Daniel Gitler, Arie Moran
Traditionally, proteins are considered to perform a single role, be it as an enzyme, a channel, a transporter or as a structural scaffold. However, recent studies have described moonlighting proteins that perform distinct and independent functions; for example, TRPM7 is both an ion channel and a kinase. ZnT-1 is a member of the Carrier Diffusion Facilitator family that is expressed throughout the phylogenetic tree from bacteria to humans. Since its cloning in 1995, ZnT-1 is considered a major extruder of Zn(2+) based on its capability to protect cells against zinc toxicity...
January 16, 2017: Metallomics: Integrated Biometal Science
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