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https://www.readbyqxmd.com/read/29769426/effect-of-the-intracellular-calcium-concentration-chelator-bapta-acetoxy-methylester-on-action-potential-duration-in-canine-ventricular-myocytes
#1
B Horvath, N Szentandrassy, R Veress, D Baranyai, K Kistamas, J Almassy, A Toth, J Magyar, T Banyasz, P P Nanasi
Intracellular calcium concentration ([Ca2+ ]i ) is often buffered by using the cell-permeant acetoxy-methylester form of the Ca2+ chelator BAPTA (BAPTA-AM) under experimental conditions. This study was designed to investigate the time-dependent actions of extracellularly applied BAPTA-AM on action potential duration (APD) in cardiac cells. Action potentials were recorded from enzymatically isolated canine ventricular myocytes with conventional sharp microelectrodes. The effect of BAPTA-AM on the rapid delayed rectifier K+ current (IKr ) was studied using conventional voltage clamp and action potential voltage clamp techniques...
February 2018: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/29760710/ionizing-radiation-induces-morphological-changes-and-immunological-modulation-of-jurkat-cells
#2
Patrick Voos, Sebastian Fuck, Fabian Weipert, Laura Babel, Dominique Tandl, Tobias Meckel, Stephanie Hehlgans, Claudia Fournier, Anna Moroni, Franz Rödel, Gerhard Thiel
Impairment or stimulation of the immune system by ionizing radiation (IR) impacts on immune surveillance of tumor cells and non-malignant cells and can either foster therapy response or side effects/toxicities of radiation therapy. For a better understanding of the mechanisms by which IR modulates T-cell activation and alters functional properties of these immune cells, we exposed human immortalized Jurkat cells and peripheral blood lymphocytes (PBL) to X-ray doses between 0.1 and 5 Gy. This resulted in cellular responses, which are typically observed also in naïve T-lymphocytes in response of T-cell receptor immune stimulation or mitogens...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29730478/calcium-mediates-cell-shape-change-in-human-peritoneal-mesothelial-cells
#3
Stephen D Bird
Mast cells in the peritoneal membrane (PM) may degranulate to release preformed inflammatory mediators including histamine which is capable of diffusing into the surrounding interstitium, modulating cells in their vicinity including, human peritoneal mesothelial cells (hPMC). The present study aimed to investigate the quorum intracellular calcium ([Ca2+ i ]) response to histamine compared to the membrane soluble ionophore, A23187, in adherent cultured hPMC. To examine [Ca2+ i ] handling, Fura - 2 loaded cells were exposed to histamine and A23187...
February 21, 2018: Cell Calcium
https://www.readbyqxmd.com/read/29730398/capa-periviscerokinin-mediated-activation-of-mapk-erk-signaling-through-gq-plc-pkc-dependent-cascade-and-reciprocal-erk-activation-dependent-internalized-kinetics-of-bom-capa-pvk-receptor-2
#4
Zhangfei Shen, Xiaoyuan Yang, Yu Chen, Liangen Shi
Bombyx mori neuropeptide G protein-coupled receptor (BNGR)-A27 is a specific receptor for B. mori capability (CAPA) periviscerokinin (PVK), that is, Bom-CAPA-PVK receptor 2. Upon stimulation of Bom-CAPA-PVK-1 or -PVK-2, Bom-CAPA-PVK receptor 2 significantly increases cAMP-response element-controlled luciferase activity and Ca2+ mobilization in a Gq inhibitor-sensitive manner. However, the underlying mechanism(s) for CAPA/CAPA receptor system mediation of extracellular signal-regulated kinases1/2 (ERK1/2) activation remains to be explained further...
May 3, 2018: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29719463/compound-k-induced-apoptosis-via-endoplasmic-reticulum-ca-2-release-through-ryanodine-receptor-in-human-lung-cancer-cells
#5
Dong-Hyun Shin, Dong-Gyu Leem, Ji-Sun Shin, Joo-Il Kim, Kyung-Tack Kim, Sang Yoon Choi, Myung-Hee Lee, Jung-Hye Choi, Kyung-Tae Lee
Background: Extended endoplasmic reticulum (ER) stress may initiate apoptotic pathways in cancer cells, and ER stress has been reported to possibly increase tumor death in cancer therapy. We previously reported that caspase-8 played an important role in compound K-induced apoptosis via activation of caspase-3 directly or indirectly through Bid cleavage, cytochrome c release, and caspase-9 activation in HL-60 human leukemia cells. The mechanisms leading to apoptosis in A549 and SK-MES-1 human lung cancer cells and the role of ER stress have not yet been understood...
April 2018: Journal of Ginseng Research
https://www.readbyqxmd.com/read/29702262/signaling-pathways-involved-in-the-rapid-biphasic-effect-of-aldosterone-on-na-h-exchanger-in-rat-proximal-tubule-cells
#6
Deise C A Leite-Dellova, Shirley J Szriber, Giovana K F Merighe, Juliano Z Polidoro, Nancy A Rebouças, Maria Oliveira-Souza, Margarida de Mello-Aires
The receptors and signaling pathways for nongenomic effects of aldosterone (Aldo) on the proximal Na+ /H+ exchanger are still unknown; therefore, the aim of this study was to investigate the mineralocorticoid receptor (MR) and/or glucocorticoid receptor (GR) participation in rapid Aldo effects on NHE1 (basolateral Na+ /H+ exchanger isoform) and cytosolic calcium concentration ([Ca2+ ]i ). In addition, phospholipase C (PLC), protein kinase C (PKC), and mitogen-activated protein kinase kinase (MEK) involvement in signaling pathways of such effects was evaluated, using immortalized proximal tubule cells of rat (IRPTC) as an experimental model...
April 24, 2018: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29702100/signaling-pathways-activated-by-resolvin-e1-to-stimulate-mucin-secretion-and-increase-intracellular-ca-2-in-cultured-rat-conjunctival-goblet-cells
#7
Marit Lippestad, Robin R Hodges, Tor P Utheim, Charles N Serhan, Darlene A Dartt
Glycoconjugate mucin secretion from conjunctival goblet cells is tightly regulated by nerves and specialized pro-resolving mediators (SPMs) to maintain ocular surface health. Here we investigated the actions of the SPM resolvin E1 (RvE1) on cultured rat conjunctival goblet cell glycoconjugate secretion and intracellular [Ca2+ ] ([Ca2+ ]i ) and the signaling pathways used by RvE1. Goblet cells were cultured from rat conjunctiva in RPMI medium. The amount of RvE1-stimulated glycoconjugate mucin secretion was determined using an enzyme-linked lectin assay with Ulex Europaeus Agglutinin 1 lectin...
April 24, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29701904/trpv4-activates-cytosolic-phospholipase-a-2-via-ca-2-dependent-pkc-erk1-2-signaling-in-controlling-hypertensive-contraction
#8
Hongjuan Li, Hao Kan, Xiaodong Zhang, Zhenyu Yang, Jian Jin, Peng Zhang, Xin Ma
Activation of TRPV4 (transient receptor potential vanilloid 4) has been reported to result in endothelium-dependent contraction in the aortae of hypertensive mice. This contraction involved increased cPLA2 (cytosolic phospholipase A2 ) activity. The mechanism by which TRPV4 regulates cPLA2 activity to induce contraction in hypertension, however, is unknown. Through measurements of arterial tension and protein level, we showed that high salt diet induced hypertension increases activity of PKC (protein kinase C) and ERK1/2 (extracellular signal-regulated kinase 1/2)...
April 27, 2018: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/29692105/-effects-of-ca-2-on-nitric-oxide-induced-adventitious-rooting-in-cucumber-under-drought-stress
#9
Chun Lan Li, Li Juan Niu, Lin Li Hu, Wei Biao Liao, Yue Chen
Cucumber (Cucumis sativus L. 'Xinchun 4') was used to explore the relationship between nitric oxide (NO) and calcium (Ca2+ ) during adventitious rooting under drought stress. Rooting parameters, endogenous Ca2+ fluorescent intensity and the antioxidant enzymes activity (SOD, CAT and APX) in cucumber explants under drought stress were investigated. The results showed that treatment with 200 μmol·L-1 CaCl2 and 0.05% PEG significantly improved the number and length of adventitious root in cucumber explants under drought stress, while the application of Ca2+ chelating agent (EGTA) and channel inhibitor (BAPTA/AM) significantly decreased NO-induced number and length of adventitious root under drought stress...
November 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29675630/saikosaponin-d-inhibits-proliferation-by-up-regulating-autophagy-via-the-camkk%C3%AE-ampk-mtor-pathway-in-adpkd-cells
#10
Weiwei Shi, Dechao Xu, Junhui Gu, Cheng Xue, Bo Yang, Lili Fu, Shuwei Song, Dongmei Liu, Wei Zhou, Jiayi Lv, Ke Sun, Meihan Chen, Changlin Mei
Autosomal dominant polycystic kidney disease (ADPKD) is a common heritable human disease. Recently, the role of repressed autophagy in ADPKD has drawn increasing attention. Here, we investigate the mechanism underlying the effect of Saikosaponin-d (SSd), a sarcoplasmic/endoplasmic reticulum Ca2+ ATPase pump (SERCA) inhibitor. We show that SSd suppresses proliferation in ADPKD cells by up-regulating autophagy. We found that treatment with SSd results in the accumulation of intracellular calcium, which in turn activates the CaMKKβ-AMPK signalling cascade, inhibits mTOR signalling and induces autophagy...
April 19, 2018: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29673589/intracellular-calcium-is-a-rheostat-for-the-sting-signaling-pathway
#11
Dohyeong Kwon, Hiromi Sesaki, Suk-Jo Kang
Stimulator of IFN genes (STING) is essential for the DNA-sensing innate immune pathway. Recently, evidence is emerging that suggests STING also plays important roles in autoimmunity, cancer therapy, and senescence. Although a multitude of post-translational modifications that regulate the STING pathway have been discovered, the cellular events that guide STING translocation remain unclear. Here, we show, paradoxically, that both BAPTA-AM-mediated calcium depletion and ionomycin-induced calcium elevation suppress STING translocation and STING-mediated IFN-β production...
April 16, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29593564/dynamic-action-potential-restitution-contributes-to-mechanical-restitution-in-right-ventricular-myocytes-from-pulmonary-hypertensive-rats
#12
Matthew E L Hardy, Eleftheria Pervolaraki, Olivier Bernus, Ed White
We investigated the steepened dynamic action potential duration (APD) restitution of rats with pulmonary artery hypertension (PAH) and right ventricular (RV) failure and tested whether the observed APD restitution properties were responsible for negative mechanical restitution in these myocytes. PAH and RV failure were provoked in male Wistar rats by a single injection of monocrotaline (MCT) and compared with saline-injected animals (CON). Action potentials were recorded from isolated RV myocytes at stimulation frequencies between 1 and 9 Hz...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29589836/laser-induced-calcium-oscillations-in-fluorescent-calcium-imaging
#13
János Vincze, Nikolett Geyer, Gyula Diszházi, László Csernoch, Tamás Bíró, István Jóna, Beatrix Dienes, János Almássy
Phototoxicity is the most common problem investigators may encounter when performing live cell imaging. It develops due to excess laser exposure of cells loaded with fluorophores and can lead to often overlooked but significant artifacts, such as massive increase of intracellular Ca2+ concentration, which would make data interpretation problematic. Because information about laser- and dye-related changes in cytoplasmic calcium concentration is very limited, we aimed to describe this phenomenon to help investigators using laser scanning confocal microscopy in a non-invasive way...
March 28, 2018: General Physiology and Biophysics
https://www.readbyqxmd.com/read/29579120/hsv-1-induced-disruption-of-transcription-termination-resembles-a-cellular-stress-response-but-selectively-increases-chromatin-accessibility-downstream-of-genes
#14
Thomas Hennig, Marco Michalski, Andrzej J Rutkowski, Lara Djakovic, Adam W Whisnant, Marie-Sophie Friedl, Bhaskar Anand Jha, Marisa A P Baptista, Anne L'Hernault, Florian Erhard, Lars Dölken, Caroline C Friedel
Lytic herpes simplex virus 1 (HSV-1) infection triggers disruption of transcription termination (DoTT) of most cellular genes, resulting in extensive intergenic transcription. Similarly, cellular stress responses lead to gene-specific transcription downstream of genes (DoG). In this study, we performed a detailed comparison of DoTT/DoG transcription between HSV-1 infection, salt and heat stress in primary human fibroblasts using 4sU-seq and ATAC-seq. Although DoTT at late times of HSV-1 infection was substantially more prominent than DoG transcription in salt and heat stress, poly(A) read-through due to DoTT/DoG transcription and affected genes were significantly correlated between all three conditions, in particular at earlier times of infection...
March 26, 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29578247/benzo-a-pyrene-decreased-gap-junctional-intercellular-communication-via-calcium-calmodulin-signaling-increases-apoptosis-in-tm4-cells
#15
Xiaoli Ji, Xin Chou, Zehe Ge, Fan Ding, Hui Gao, Qing Wu
The mechanism of male reproductive toxicity induced by benzo[a]pyrene (BaP) is poorly understood. Gap junctional intercellular communication (GJIC) is known to play a critical role in maintaining spermatogenesis. The aim of the present study was to determine the toxic effects of BaP in Sertoli cells, and to explore the possibility and potential mechanisms of BaP-induced changes in the level of GJIC, and the relationship between GJIC and BaP-induced apoptosis. We treated mouse Sertoli cell lines (TM4) with different concentrations (0...
March 26, 2018: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29574924/the-effects-of-transient-receptor-potential-channel-trpc-on-airway-smooth-muscle-cell-isolated-from-asthma-model-mice
#16
Xiaoyu Zhang, Zhixin Zhao, Lijun Ma, Yali Guo, Xiaosu Li, Limin Zhao, Cuijie Tian, Xueyi Tang, Dongjun Cheng, Zhuochang Chen, Luoxian Zhang
This study aimed to validate whether transient receptor potential channel1 (TRPC1) and TRPC3 participate in the regulation the proliferation of airway smooth muscle cells (ASMCs) through modulating calcium ion (Ca2+ ) influx in vitro. Chronic model of murine asthma was induced and ASMCs isolated from asthmatic mice were used in this whole study. TRPC1 and TRPC3 were upregulated in asthmatic mouse ASMCs and selected for further investigation. Ca2+ concentration and the cell viability of asthmatic mouse ASMCs were significantly higher than that from non- asthma mice, however, TRPC channels blocker SKF96365 alleviated these effects...
March 25, 2018: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29569183/trpv4-is-functionally-expressed-in-oligodendrocyte-precursor-cells-and-increases-their-proliferation
#17
Kana Ohashi, Ayane Deyashiki, Takahito Miyake, Kazuki Nagayasu, Koji Shibasaki, Hisashi Shirakawa, Shuji Kaneko
Oligodendrocytes, which differentiate from oligodendrocyte precursor cells (OPCs), ensheath axons with myelin, play an essential role in rapid conduction of action potentials and metabolically support neurons. Elucidation of the mechanisms underlying the proliferation, migration, differentiation, and survival of OPCs is considered indispensable for determining the causes of central nervous system diseases. However, the relationship between these functions of OPCs and their intracellular Ca2+ signaling has not been fully elucidated...
March 22, 2018: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/29563926/gsk-3%C3%AE-mediated-regulation-of-cadmium-induced-cell-death-and-survival
#18
Seungwoo Kim, Hyosoon Cheon, Sam-Moon Kim, Young-Youl Kim
Background: Previous studies indicated that cadmium (Cd) increases PI3-kinase/Akt phosphorylation, resulting in an alteration in GSK-3β activity. However, the mechanism of Cd-induced endoplasmic reticulum (ER) stress in neuronal cells has yet to be studied in needs further elucidation. We examined the role of GSK-3β in Cd-induced neuronal cell death and the related downstream signaling pathways. Methods: SH-SY5Y human neuroblastoma cells were treated with 10 or 20 μM BAPTA-AM and 1 μM wortmannin for 30 min and then incubated with 25 μM Cd for 12 h...
2018: Cellular & Molecular Biology Letters
https://www.readbyqxmd.com/read/29560113/hypoxic-induced-truncation-of-voltage-dependent-anion-channel-1-is-mediated-by-both-asparagine-endopeptidase-and-calpain-1-activities
#19
Hadas Pahima, Simona Reina, Noa Tadmor, Daniella Dadon-Klein, Anna Shteinfer-Kuzmine, Nathalie M Mazure, Vito De Pinto, Varda Shoshan-Barmatz
The voltage-dependent anion channel 1 (VDAC1), an outer mitochondria membrane (OMM) protein, serves as a mitochondrial gatekeeper, mediating the transport of nucleotides, Ca2+ and other metabolites across the OMM. VDAC1 also plays a central role in mitochondria-mediated apoptosis by facilitating the release of apoptotic proteins and by association with both pro- and anti-apoptotic proteins. Tumor cells, which are constantly exposed to hypoxic conditions, affect the cell via the transcription factor hypoxia-inducible factor (HIF) that induces transcriptional activity...
February 27, 2018: Oncotarget
https://www.readbyqxmd.com/read/29543918/chlamydia-trachomatis-inclusion-membrane-protein-mrca-interacts-with-the-inositol-1-4-5-trisphosphate-receptor-type-3-itpr3-to-regulate-extrusion-formation
#20
Phu Hai Nguyen, Erika I Lutter, Ted Hackstadt
Chlamydia trachomatis is an obligate intracellular bacterium that replicates within a vacuole termed an inclusion. At the end of their intracellular developmental cycle, chlamydiae are released either by lysis of the host cell or extrusion of the intact inclusion. The inclusion membrane is extensively modified by the insertion of type III secreted inclusion membrane proteins, Incs, which contribute to inclusion membrane structure and facilitate host-pathogen interactions. An interaction was identified between the inclusion membrane protein, MrcA, and the Ca2+ channel inositol-1,4,5-trisphosphate receptor, type 3 (ITPR3)...
March 2018: PLoS Pathogens
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