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https://www.readbyqxmd.com/read/28803370/ip3-receptor-signaling-and-endothelial-barrier-function
#1
REVIEW
Mitchell Y Sun, Melissa Geyer, Yulia A Komarova
The endothelium, a monolayer of endothelial cells lining vessel walls, maintains tissue-fluid homeostasis by restricting the passage of the plasma proteins and blood cells into the interstitium. The ion Ca(2+), a ubiquitous secondary messenger, initiates signal transduction events in endothelial cells that is critical to control of vascular tone and endothelial permeability. The ion Ca(2+) is stored inside the intracellular organelles and released into the cytosol in response to environmental cues. The inositol 1,4,5-trisphosphate (IP3) messenger facilitates Ca(2+) release through IP3 receptors which are Ca(2+)-selective intracellular channels located within the membrane of the endoplasmic reticulum...
August 12, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28800362/nucleotide-transmitters-atp-and-adp-mediate-intercellular-calcium-wave-communication-via-p2y12-13-receptors-among-bv-2-microglia
#2
Pengchong Jiang, Fulin Xing, Bu Guo, Jianyu Yang, Zheming Li, Wei Wei, Fen Hu, Imshik Lee, Xinzheng Zhang, Leiting Pan, Jingjun Xu
Nerve injury is accompanied by a liberation of diverse nucleotides, some of which act as 'find/eat-me' signals in mediating neuron-glial interplay. Intercellular Ca2+ wave (ICW) communication is the main approach by which glial cells interact and coordinate with each other to execute immune defense. However, the detailed mechanisms on how these nucleotides participate in ICW communication remain largely unclear. In the present work, we employed a mechanical stimulus to an individual BV-2 microglia to simulate localized injury...
2017: PloS One
https://www.readbyqxmd.com/read/28792096/the-inositol-pyrophosphate-synthesis-pathway-in-trypanosoma-brucei-is-linked-to-polyphosphate-synthesis-in-acidocalcisomes
#3
Ciro D Cordeiro, Adolfo Saiardi, Roberto Docampo
Inositol pyrophosphates are novel signaling molecules possessing high-energy pyrophosphate bonds and involved in a number of biological functions. Here, we report the correct identification and characterization of the kinases involved in the inositol pyrophosphate biosynthetic pathway in Trypanosoma brucei: inositol polyphosphate multikinase (TbIPMK), inositol pentakisphosphate 2-kinase (TbIP5K) and inositol hexakisphosphate kinase (TbIP6K). TbIP5K and TbIP6K were not identifiable by sequence alone and their activities were validated by enzymatic assays with the recombinant proteins or by their complementation of yeast mutants...
August 9, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28780469/role-of-pannexin1-channels-in-the-resistance-of-i-10-testicular-cancer-cells-to-cisplatin-mediated-by-atp-ip3-pathway
#4
Dandan Wu, Jianfeng Wu, Haofeng Liu, Meiling Yu, Liang Tao, Shuying Dong, Xuhui Tong
Cisplatin (DDP) is the most commonly used drug in testicular cancer. However, drug resistance severely limits its clinical use and the underlying mechanisms need to be further clarified. The aim of present study was to investigate the role of ATP/IP3 pathway mediated by pannexin1 (Panx-1) channels on DDP-induced apoptosis and to reveal the potential mechanisms of DDP-resistance in testicular cancer. We found that the expression of Panx-1 in I-10/DDP cells (DDP-resistance) was decreased compared with parental I-10 cells determined by western blotting and immunofluorescence assay...
August 3, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28758690/rearing-environment-dependent-hippocampal-local-field-potential-differences-in-wildtype-and-inositol-trisphosphate-receptor-type-2-knockout-mice
#5
Mika Tanaka, Xiaowen Wang, Katsuhiko Mikoshiba, Hajime Hirase, Yoshiaki Shinohara
Rearing in an enriched environment (ENR) is known to enhance cognitive and memory abilities in rodents, whereas social isolation (ISO) induces depression-like behaviour. The hippocampus has been documented to undergo morphological and functional changes depending on these rearing environments. For instance, rearing condition during juvenility alters CA1 stratum radiatum gamma oscillation power in rats. In this study, hippocampal CA1 local field potentials (LFP) were recorded from bilateral CA1 in urethane-anesthetized mice that were reared in either ENR or ISO condition...
July 31, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28751862/utp-gated-signaling-pathways-of-5-ht-release-from-bon-cells-as-a-model-of-human-enterochromaffin-cells
#6
Andromeda Liñán-Rico, Fernando Ochoa-Cortes, Alix Zuleta-Alarcon, Mazin Alhaj, Esmerina Tili, Josh Enneking, Alan Harzman, Iveta Grants, Sergio Bergese, Fievos L Christofi
Background: Enterochromaffin cells (EC) synthesize and release 5-HT and ATP to trigger or modulate gut neural reflexes and transmit information about visceral/pain sensation. Alterations in 5-HT signaling mechanisms may contribute to the pathogenesis of IBD or IBS, but the pharmacologic or molecular mechanisms modulating Ca(2+)-dependent 5-HT release are not understood. Previous studies indicated that purinergic signaling via ATP and ADP is an important mechanism in modulation of 5-HT release. However, EC cells also respond to UTP and UDP suggesting uridine triphosphate receptor and signaling pathways are involved as well...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28747926/agonist-induced-activation-of-human-ffa1-receptor-signals-to-extracellular-signal-regulated-kinase-1-and-2-through-gq-and-gi-coupled-signaling-cascades
#7
Jing Qian, Yuyang Gu, Chun Wu, Feng Yu, Yuqi Chen, Jingmei Zhu, Xingyi Yao, Chen Bei, Qingqing Zhu
BACKGROUND: FFA1 is abundantly expressed in the liver, skeletal muscle, monocytes and nervous system, but is particularly abundant in pancreatic β cells. It is widely believed that FFA1 exerts its regulatory roles in a variety of physiological and pathological functions. In response to oleic acid, FFA1 has been shown to induce the activation of extracellular signal-regulated kinase 1 and 2 (ERK1/2) through a mechanism involving EGFR transactivation in a breast cancer cell line. However, the underlying molecular mechanism for ERK1/2 activation mediated by n-6 free fatty acid (LA) in HEK293 cells remains to be further elucidated...
2017: Cellular & Molecular Biology Letters
https://www.readbyqxmd.com/read/28731505/calcium-calmodulin-dependent-kinase-2-camkii-mediates-epac-induced-spontaneous-transient-outward-currents-stocs-in-rat-vascular-smooth-muscle
#8
Edward S A Humphries, Tomoko Kamishima, John M Quayle, Caroline Dart
Activation of the major cAMP effector, exchange protein directly activated by cAMP (Epac), induces vascular smooth muscle relaxation by increasing the activity of ryanodine (RyR)-sensitive release channels on the peripheral sarcoplasmic reticulum. Resultant Ca(2+) sparks activate plasma membrane Ca(2+) -activated K(+) (BKCa ) channels, evoking spontaneous transient outward currents (STOCs) that hyperpolarize the cell and reduce voltage-dependent Ca(2+) entry. In this study we investigate the mechanism by which Epac increases STOC activity...
July 21, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28731171/protective-role-of-pollen-typhae-total-flavone-against-the-palmitic-acid-induced-impairment-of-glucose-stimulated-insulin-secretion-involving-gpr40-signaling-in-ins-1-cells
#9
Xiao-Tao Feng, Hui-Ming Duan, Shuang-Lei Li
Prolonged elevated levels of free fatty acids (FFAs) contribute to the impairment of insulin secretion function of pancreatic β cells, a hallmark of type 2 diabetes, which is partly attributed to the dysfunction of G-protein-coupled receptor 40 (GPR40) signaling. Pollen Typhae total flavone (PTF), an extract from a Chinese herbal medicine named Pollen Typhae, has been reported to effectively treat type 2 diabetes, but the underlying mechanisms remain to be fully elucidated. In the present study, palmitic acid (PA), a saturated fatty acid, severely impaired glucose-stimulated insulin secretion (GSIS) in a time-dependent manner in INS-1 cells, and PTF treatment prevented the impairment in a dose-dependent manner...
July 18, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28729872/plc-mediated-signaling-pathway-in-pollen-tubes-regulates-the-gametophytic-self-incompatibility-of-pyrus-species
#10
Haiyong Qu, Yaqin Guan, Yongzhang Wang, Shaolin Zhang
Among the Rosaceae species, the gametophytic self-incompatibility (GSI) is controlled by a single multi-allelic S locus, which is composed of the pistil-S and pollen-S genes. The pistil-S gene encodes a polymorphic ribonuclease (S-RNase), which is essential for identifying self-pollen. However, the S-RNase system has not been fully characterized. In this study, the self-S-RNase inhibited the Ca(2+)-permeable channel activity at pollen tube apices and the selectively decreased phospholipase C (PLC) activity in the plasma membrane of Pyrus pyrifolia pollen tubes...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28727921/effect-of-lysophosphatidylglycerol-on-intracellular-free-ca2-concentration-in-a10-vascular-smooth-muscle-cells
#11
Ying Zhang, Jing-Dian Zhang, Ming-Qin Zhu, Ming Zhang, Yan-Jun Xu, Li Cui, Naranjan S Dhalla
Although plasma levels of lysophosphatidylglycerol (LPG) are increased in hypertension, its role in the pathogenesis of vascular defects is not clear. In view of the importance of Ca2+-overload in causing vascular smooth muscle (VSM) dysfunction, the action of LPG on [Ca2+]i in cultured A10 VSM cell line was examined by using Fura 2-AM acetoxymethyl ester technique. LPG was found to induce a concentration-dependent increase in [Ca2+]i in VSM cells. This change was dependent both on the extracellular and intracellular Ca2+ sources as it was reduced by 30% by EGTA, an extracellular Ca2+ chelator, and 70% by tharpsigargin, a sarcoplasmic reticulum (SR) Ca2+-pump inhibitor...
July 20, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28725634/ip3-receptor-mediated-calcium-signaling-and-its-role-in-autophagy-in-cancer
#12
REVIEW
Elzbieta Kania, Gemma Roest, Tim Vervliet, Jan B Parys, Geert Bultynck
Calcium ions (Ca(2+)) play a complex role in orchestrating diverse cellular processes, including cell death and survival. To trigger signaling cascades, intracellular Ca(2+) is shuffled between the cytoplasm and the major Ca(2+) stores, the endoplasmic reticulum (ER), the mitochondria, and the lysosomes. A key role in the control of Ca(2+) signals is attributed to the inositol 1,4,5-trisphosphate (IP3) receptors (IP3Rs), the main Ca(2+)-release channels in the ER. IP3Rs can transfer Ca(2+) to the mitochondria, thereby not only stimulating core metabolic pathways but also increasing apoptosis sensitivity and inhibiting basal autophagy...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28713009/aeromonas-hydrophila-induced-alterations-in-cytosolic-calcium-activate-pro-apoptotic-cpkc-mek1-2-tnf%C3%AE-axis-in-infected-headkidney-macrophages-of-clarias-gariepinus
#13
Asha Shelly, Chaitali Banerjee, Gunjan Kumar Saurav, Atish Ray, Vipin Singh Rana, Rajagopal Raman, Shibnath Mazumder
Alterations in intracellular-calcium (Ca(2+))i homeostasis is critical to Aeromonas hydrophila-induced headkidney macrophages (HKM) apoptosis of Clarias gariepinus, though the implications are poorly understood. Here, we describe the role of intermediate molecules of Ca(2+-)signaling pathway that are involved in HKM apoptosis. We observed phosphoinositide-3-kinase/phospholipase C is critical for (Ca(2+))i release in infected HKM. Heightened protein kinase-C (PKC) activity and phosphorylation of MEK1/2-ERK1/2 was noted which declined in presence of 2-APB, Go6976 and PD98059, inhibitors to IP3-receptor, conventional PKC isoforms (cPKC) and MEK1/2 respectively implicating Ca(2+)/cPKC/MEK-ERK1/2 axis imperative in A...
July 14, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28708511/fsh-receptor-binding-inhibitor-influences-estrogen-production-receptor-expression-and-signal-pathway-during-in%C3%A2-vitro-maturation-of-sheep-cocs
#14
Gong Zhuandi, Liang Haoqin, Deng Yingying, Lai Luju, Wei Suocheng, Zhaxi Yingpai, Li You
Follicle-stimulating hormone (FSH) promotes secretion of follicle fluid and follicle development. FSH acts via cognate FSH receptor (FSHR). It remains unknown whether the supplement of FSH-receptor binding inhibitor (FRBI) into the in vitro maturation (IVM)medium influence the estrogen receptor expression and signal pathway of oocytes in sheep. The present study aimed to investigate FRBI effects on inositol trisphosphate (IP3) of oocytes and protein kinase A (PKA) of sheep granulosa cells, further to elucidate the signal pathway of FRBI effects...
June 29, 2017: Theriogenology
https://www.readbyqxmd.com/read/28705807/augmentation-of-cgmp-pkg-pathway-and-colonic-motility-by-hydrogen-sulfide
#15
Ancy D Nalli, Sayak Bhattacharya, Hongxia Wang, Derek M Kendig, John R Grider, Karnam S Murthy
Hydrogen sulfide (H2S), like nitric oxide (NO), causes smooth muscle relaxation, but unlike NO, does not stimulate soluble guanylyl cyclase (sGC) activity and generate cGMP. The aim of this study was to investigate the interplay between NO and H2S in colonic smooth muscle. In colonic smooth muscle from rabbit, mouse and human, L-cysteine, substrate of cystathionine-γ-lyase (CSE), or NaHS, an H2S donor, inhibited phosphodiesterase 5 (PDE5) activity and augmented the increase in cGMP levels, IP3 receptor phosphorylation at Ser(1756) (measured as a proxy for PKG activation), and muscle relaxation in response to NO donor, s-nitrosoglutathione (GSNO), suggesting augmentation of cGMP/PKG pathway by H2S...
July 13, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28700117/infrared-neural-stimulation-induces-intracellular-ca-2-release-mediated-by-phospholipase-c
#16
David Moreau, Claire Lefort, Jolien Pas, Sylvia M Bardet, Philippe Leveque, Rodney P O'Connor
The influence of infrared laser pulses on intracellular Ca(2+) signaling was investigated in neural cell lines with fluorescent live cell imaging. The probe Fluo-4 was used to measure Ca(2+) in HT22 mouse hippocampal neurons and non-electrically excitable U87 human glioblastoma cells exposed to 50-500 ms infrared pulses at 1470 nm. Fluorescence recordings of Fluo-4 demonstrated that infrared stimulation induced an instantaneous intracellular Ca(2+) transient with similar dose-response characteristics in hippocampal neurons and glioblastoma cells (half-maximal effective energy density EC50 of around 58 J...
July 12, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28677119/atp-evokes-ca-2-signals-in-cultured-foetal-human-cortical-astrocytes-entirely-through-g-protein-coupled-p2y-receptors
#17
Margit S Muller, Colin W Taylor
Extracellular ATP plays important roles in coordinating the activities of astrocytes and neurons, and aberrant signalling is associated with neurodegenerative diseases. In rodents, ATP stimulates opening of Ca(2+) -permeable channels formed by P2X receptor subunits in the plasma membrane. It is widely assumed, but not verified, that P2X receptors also evoke Ca(2+) signals in human astrocytes. Here we directly assess this hypothesis. We showed that cultured foetal cortical human astrocytes express mRNA for several P2X receptor subunits (P2X4 , P2X5 , P2X6 ) and G-protein-coupled P2Y receptors (P2Y1 , P2Y2 , P2Y6 , P2Y11 )...
July 5, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28676489/voltage-dependent-ca-2-entry-into-smooth-muscle-during-contraction-promotes-endothelium-mediated-feedback-vasodilation-in-arterioles
#18
Christopher J Garland, Pooneh Bagher, Chloe Powell, Xi Ye, Hamish A L Lemmey, Lyudmyla Borysova, Kim A Dora
Vascular smooth muscle contraction is suppressed by feedback dilation mediated by the endothelium. In skeletal muscle arterioles, this feedback can be activated by Ca(2+) signals passing from smooth muscle through gap junctions to endothelial cells, which protrude through holes in the internal elastic lamina to make contact with vascular smooth muscle cells. Although hypothetically either Ca(2+) or inositol trisphosphate (IP3) may provide the intercellular signal, it is generally thought that IP3 diffusion is responsible...
July 4, 2017: Science Signaling
https://www.readbyqxmd.com/read/28674006/clusters-of-calcium-release-channels-harness-the-ising-phase-transition-to-confine-their-elementary-intracellular-signals
#19
Anna V Maltsev, Victor A Maltsev, Michael D Stern
Intracellular Ca signals represent a universal mechanism of cell function. Messages carried by Ca are local, rapid, and powerful enough to be delivered over the thermal noise. A higher signal-to-noise ratio is achieved by a cooperative action of Ca release channels such as IP3 receptors or ryanodine receptors arranged in clusters (release units) containing a few to several hundred release channels. The channels synchronize their openings via Ca-induced Ca release, generating high-amplitude local Ca signals known as puffs in neurons and sparks in muscle cells...
July 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28660247/phototransduction-in-drosophila-is-compromised-by-gal4-expression-but-not-by-insp3-receptor-knockdown-or-mutation
#20
Murali K Bollepalli, Marije E Kuipers, Che-Hsiung Liu, Sabrina Asteriti, Roger C Hardie
Drosophila phototransduction is mediated by phospholipase C, leading to activation of transient receptor potential (TRP) and TRP-like (TRPL) channels by mechanisms that are unresolved. A role for InsP3 receptors (IP3Rs) had been excluded because IP3R mutants (itpr) appeared to have normal light responses; however, this was recently challenged by Kohn et al. ("Functional cooperation between the IP3 receptor and phospholipase C secures the high sensitivity to light of Drosophila photoreceptors in vivo," Journal of Neuroscience 35:2530), who reported defects in phototransduction after IP3R-RNAi knockdown...
May 2017: ENeuro
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