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Gil Montoya DC, Ornelas-Guevara R, Diercks BP, Guse AH, Dupont G. T cell Ca 2+ microdomains through the lens of computational modeling. Front Immunol 2023; 14:1235737. [PMID: 37860008 PMCID: PMC10582754 DOI: 10.3389/fimmu.2023.1235737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 09/18/2023] [Indexed: 10/21/2023] Open
Abstract
Cellular Ca2+ signaling is highly organized in time and space. Locally restricted and short-lived regions of Ca2+ increase, called Ca2+ microdomains, constitute building blocks that are differentially arranged to create cellular Ca2+ signatures controlling physiological responses. Here, we focus on Ca2+ microdomains occurring in restricted cytosolic spaces between the plasma membrane and the endoplasmic reticulum, called endoplasmic reticulum-plasma membrane junctions. In T cells, these microdomains have been finely characterized. Enough quantitative data are thus available to develop detailed computational models of junctional Ca2+ dynamics. Simulations are able to predict the characteristics of Ca2+ increases at the level of single channels and in junctions of different spatial configurations, in response to various signaling molecules. Thanks to the synergy between experimental observations and computational modeling, a unified description of the molecular mechanisms that create Ca2+ microdomains in the first seconds of T cell stimulation is emerging.
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Affiliation(s)
- Diana C. Gil Montoya
- The Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Roberto Ornelas-Guevara
- Unit of Theoretical Chronobiology, Faculté des Sciences CP231, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Björn-Philipp Diercks
- The Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Andreas H. Guse
- The Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Geneviève Dupont
- Unit of Theoretical Chronobiology, Faculté des Sciences CP231, Université Libre de Bruxelles (ULB), Brussels, Belgium
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Weiß M, Hernandez LC, Gil Montoya DC, Löhndorf A, Krüger A, Kopdag M, Uebler L, Landwehr M, Nawrocki M, Huber S, Woelk LM, Werner R, Failla AV, Flügel A, Dupont G, Guse AH, Diercks BP. Adhesion to laminin-1 and collagen IV induces the formation of Ca 2+ microdomains that sensitize mouse T cells for activation. Sci Signal 2023; 16:eabn9405. [PMID: 37339181 DOI: 10.1126/scisignal.abn9405] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Accepted: 05/31/2023] [Indexed: 06/22/2023]
Abstract
During an immune response, T cells migrate from blood vessel walls into inflamed tissues by migrating across the endothelium and through extracellular matrix (ECM). Integrins facilitate T cell binding to endothelial cells and ECM proteins. Here, we report that Ca2+ microdomains observed in the absence of T cell receptor (TCR)/CD3 stimulation are initial signaling events triggered by adhesion to ECM proteins that increase the sensitivity of primary murine T cells to activation. Adhesion to the ECM proteins collagen IV and laminin-1 increased the number of Ca2+ microdomains in a manner dependent on the kinase FAK, phospholipase C (PLC), and all three inositol 1,4,5-trisphosphate receptor (IP3R) subtypes and promoted the nuclear translocation of the transcription factor NFAT-1. Mathematical modeling predicted that the formation of adhesion-dependent Ca2+ microdomains required the concerted activity of two to six IP3Rs and ORAI1 channels to achieve the increase in the Ca2+ concentration in the ER-plasma membrane junction that was observed experimentally and that required SOCE. Further, adhesion-dependent Ca2+ microdomains were important for the magnitude of the TCR-induced activation of T cells on collagen IV as assessed by the global Ca2+ response and NFAT-1 nuclear translocation. Thus, adhesion to collagen IV and laminin-1 sensitizes T cells through a mechanism involving the formation of Ca2+ microdomains, and blocking this low-level sensitization decreases T cell activation upon TCR engagement.
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Affiliation(s)
- Mariella Weiß
- Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Lola C Hernandez
- Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Diana C Gil Montoya
- Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Anke Löhndorf
- Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Aileen Krüger
- Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Miriam Kopdag
- Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Liana Uebler
- Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Marie Landwehr
- Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Mikolaj Nawrocki
- Section of Molecular Immunology und Gastroenterology, I. Department of Medicine, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Samuel Huber
- Section of Molecular Immunology und Gastroenterology, I. Department of Medicine, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Lena-Marie Woelk
- Department of Computational Neuroscience, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - René Werner
- Department of Computational Neuroscience, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Antonio V Failla
- Microscopy Imaging Facility (UMIF), University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Alexander Flügel
- Institute for Neuroimmunology and Multiple Sclerosis Research, University Medical Centre Göttingen, 37075 Göttingen, Germany
| | - Geneviève Dupont
- Unité de Chronobiologie Théorique, Faculté des Sciences, CP231, Université Libre de Bruxelles (ULB), B-1050 Brussels, Belgium
| | - Andreas H Guse
- Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Björn-Philipp Diercks
- Calcium Signalling Group, Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
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3
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Zhang X, Wang Y, Song J, Gerwien H, Chuquisana O, Chashchina A, Denz C, Sorokin L. The endothelial basement membrane acts as a checkpoint for entry of pathogenic T cells into the brain. J Exp Med 2021; 217:151744. [PMID: 32379272 PMCID: PMC7336306 DOI: 10.1084/jem.20191339] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 01/31/2020] [Accepted: 04/07/2020] [Indexed: 12/30/2022] Open
Abstract
The endothelial cell basement membrane (BM) is a barrier to migrating leukocytes and a rich source of signaling molecules that can influence extravasating cells. Using mice lacking the major endothelial BM components, laminin 411 or 511, in murine experimental autoimmune encephalomyelitis (EAE), we show here that loss of endothelial laminin 511 results in enhanced disease severity due to increased T cell infiltration and altered polarization and pathogenicity of infiltrating T cells. In vitro adhesion and migration assays reveal higher binding to laminin 511 than laminin 411 but faster migration across laminin 411. In vivo and in vitro analyses suggest that integrin α6β1- and αvβ1-mediated binding to laminin 511-high sites not only holds T cells at such sites but also limits their differentiation to pathogenic Th17 cells. This highlights the importance of the interface between the endothelial monolayer and the underlying BM for modulation of immune cell phenotype.
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Affiliation(s)
- Xueli Zhang
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Muenster, Germany.,Cells-in-Motion Cluster of Excellence, University of Muenster, Muenster, Germany
| | - Ying Wang
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Muenster, Germany
| | - Jian Song
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Muenster, Germany.,Cells-in-Motion Cluster of Excellence, University of Muenster, Muenster, Germany
| | - Hanna Gerwien
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Muenster, Germany.,Cells-in-Motion Cluster of Excellence, University of Muenster, Muenster, Germany
| | - Omar Chuquisana
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Muenster, Germany.,Cells-in-Motion Cluster of Excellence, University of Muenster, Muenster, Germany
| | - Anna Chashchina
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Muenster, Germany.,Cells-in-Motion Cluster of Excellence, University of Muenster, Muenster, Germany
| | - Cornelia Denz
- Cells-in-Motion Cluster of Excellence, University of Muenster, Muenster, Germany.,Institute of Applied Physics, University of Muenster, Muenster, Germany
| | - Lydia Sorokin
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Muenster, Germany.,Cells-in-Motion Cluster of Excellence, University of Muenster, Muenster, Germany
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4
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Gerashchenko TS, Novikov NM, Krakhmal NV, Zolotaryova SY, Zavyalova MV, Cherdyntseva NV, Denisov EV, Perelmuter VM. Markers of Cancer Cell Invasion: Are They Good Enough? J Clin Med 2019; 8:E1092. [PMID: 31344926 PMCID: PMC6723901 DOI: 10.3390/jcm8081092] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 07/20/2019] [Accepted: 07/22/2019] [Indexed: 12/12/2022] Open
Abstract
Invasion, or directed migration of tumor cells into adjacent tissues, is one of the hallmarks of cancer and the first step towards metastasis. Penetrating to adjacent tissues, tumor cells form the so-called invasive front/edge. The cellular plasticity afforded by different kinds of phenotypic transitions (epithelial-mesenchymal, collective-amoeboid, mesenchymal-amoeboid, and vice versa) significantly contributes to the diversity of cancer cell invasion patterns and mechanisms. Nevertheless, despite the advances in the understanding of invasion, it is problematic to identify tumor cells with the motile phenotype in cancer tissue specimens due to the absence of reliable and acceptable molecular markers. In this review, we summarize the current information about molecules such as extracellular matrix components, factors of epithelial-mesenchymal transition, proteases, cell adhesion, and actin cytoskeleton proteins involved in cell migration and invasion that could be used as invasive markers and discuss their advantages and limitations. Based on the reviewed data, we conclude that future studies focused on the identification of specific invasive markers should use new models one of which may be the intratumor morphological heterogeneity in breast cancer reflecting different patterns of cancer cell invasion.
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Affiliation(s)
- Tatiana S Gerashchenko
- Laboratory of Molecular Oncology and Immunology, Cancer Research Institute, Tomsk National Research Medical Center, 634009 Tomsk, Russia.
| | - Nikita M Novikov
- Laboratory of Molecular Oncology and Immunology, Cancer Research Institute, Tomsk National Research Medical Center, 634009 Tomsk, Russia
- Department of Cytology and Genetics, Tomsk State University, 634050 Tomsk, Russia
| | - Nadezhda V Krakhmal
- Department of Pathological Anatomy, Siberian State Medical University, 634050 Tomsk, Russia
| | - Sofia Y Zolotaryova
- Department of Cytology and Genetics, Tomsk State University, 634050 Tomsk, Russia
| | - Marina V Zavyalova
- Department of Pathological Anatomy, Siberian State Medical University, 634050 Tomsk, Russia
- Department of General and Molecular Pathology, Cancer Research Institute, Tomsk National Research Medical Center, 634009 Tomsk, Russia
| | - Nadezhda V Cherdyntseva
- Laboratory of Molecular Oncology and Immunology, Cancer Research Institute, Tomsk National Research Medical Center, 634009 Tomsk, Russia
- Laboratory for Translational Cellular and Molecular Biomedicine, Tomsk State University, 634050 Tomsk, Russia
| | - Evgeny V Denisov
- Laboratory of Molecular Oncology and Immunology, Cancer Research Institute, Tomsk National Research Medical Center, 634009 Tomsk, Russia
- Department of Organic Chemistry, Tomsk State University, 634050 Tomsk, Russia
| | - Vladimir M Perelmuter
- Department of General and Molecular Pathology, Cancer Research Institute, Tomsk National Research Medical Center, 634009 Tomsk, Russia
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5
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Anguita E, Villalobo A. Ca 2+ signaling and Src-kinases-controlled cellular functions. Arch Biochem Biophys 2018; 650:59-74. [DOI: 10.1016/j.abb.2018.05.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 04/26/2018] [Accepted: 05/07/2018] [Indexed: 12/16/2022]
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Roles of Integrins and Intracellular Molecules in the Migration and Neuritogenesis of Fetal Cortical Neurons: MEK Regulates Only the Neuritogenesis. NEUROSCIENCE JOURNAL 2013; 2013:859257. [PMID: 26317102 PMCID: PMC4437273 DOI: 10.1155/2013/859257] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Accepted: 12/16/2012] [Indexed: 11/24/2022]
Abstract
The roles of integrin subunits and intracellular molecules in regulating the migration and neuritogenesis of neurons isolated from 16.5 gestation days rat fetal cortices were examined using in vitro assays.
Results showed that laminin supported the migration of fetal cortical neurons better than fibronectin and that the fetal cortical neurons migrated on laminin using β1 and α3 integrin subunits which make up the α3β1 integrin receptor. On fibronectin, the migration was mediated by β1 integrin subunit. Perturbation of src kinase, phospholipase C, or protein kinase C activity, inhibition of IP3 receptor mediated calcium release, or chelation of intracellular calcium inhibited both migration and neuritogenesis, whereas inhibition of growth factor signaling via MEK inhibited only the neuritogenesis. The detection of α1 and α9 transcripts suggested that the migration of fetal cortical neurons may also be mediated by α1β1 and α9β1 integrin receptors.
Results showed that calcium may regulate migration and neuritogenesis by maintaining optimum levels of microtubules in the fetal cortical neurons.
It is concluded that the fetal cortical neurons are fully equipped with the integrin signaling cascade required for their migration and neuritogenesis, whereas crosstalk between the integrin and growth-factor signaling regulate only the neuritogenesis.
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Fennewald SM, Kantara C, Sastry SK, Resto VA. Laminin interactions with head and neck cancer cells under low fluid shear conditions lead to integrin activation and binding. J Biol Chem 2012; 287:21058-66. [PMID: 22547070 DOI: 10.1074/jbc.m112.360313] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Lymphatic metastasis of cancer cells involves movement from the primary tumor site to the lymph node, where the cells must be able to productively lodge and grow. It is there that tumor cells encounter cellular and non-cellular constituent elements that make up the lymph node parenchyma. Our work shows that head and neck squamous cell carcinoma (HNSCC) cell lines are able to bind to laminin, fibronectin, vitronectin, and hyaluronic acid, which are extracellular matrix elements within the lymph node parenchyma. HNSCC cell lines bound to laminin under lymphodynamic low shear stress (0.07 dynes/cm(2)), consistent with lymph flow via β1 integrins, including α2β1, α3β1, and α6β1. Binding occurred in the presence of shear stress and not in the absence of flow. Additionally, tumor cell binding to laminin under flow did result in calcium signaling. Our data indicate a novel role for β1 integrin-mediated binding of HNSCC cells to laminin under conditions of lymphodynamic flow that results in intracellular calcium signaling within the cancer cell.
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Affiliation(s)
- Susan M Fennewald
- Department of Otolaryngology, UTMB Health, University of Texas Medical Branch, Galveston, Texas 77555-0521, USA
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8
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Ramanathan S, Mazzalupo S, Boitano S, Montfort WR. Thrombospondin-1 and angiotensin II inhibit soluble guanylyl cyclase through an increase in intracellular calcium concentration. Biochemistry 2011; 50:7787-99. [PMID: 21823650 DOI: 10.1021/bi201060c] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Nitric oxide (NO) regulates cardiovascular hemostasis by binding to soluble guanylyl cyclase (sGC), leading to cGMP production, reduced cytosolic calcium concentration ([Ca(2+)](i)), and vasorelaxation. Thrombospondin-1 (TSP-1), a secreted matricellular protein, was recently discovered to inhibit NO signaling and sGC activity. Inhibition of sGC requires binding to cell-surface receptor CD47. Here, we show that a TSP-1 C-terminal fragment (E3CaG1) readily inhibits sGC in Jurkat T cells and that inhibition requires an increase in [Ca(2+)](i). Using flow cytometry, we show that E3CaG1 binds directly to CD47 on the surface of Jurkat T cells. Using digital imaging microscopy on live cells, we further show that E3CaG1 binding results in a substantial increase in [Ca(2+)](i), up to 300 nM. Addition of angiotensin II, a potent vasoconstrictor known to increase [Ca(2+)](i), also strongly inhibits sGC activity. sGC isolated from calcium-treated cells or from cell-free lysates supplemented with Ca(2+) remains inhibited, while addition of kinase inhibitor staurosporine prevents inhibition, indicating inhibition is likely due to phosphorylation. Inhibition is through an increase in K(m) for GTP, which rises to 834 μM for the NO-stimulated protein, a 13-fold increase over the uninhibited protein. Compounds YC-1 and BAY 41-2272, allosteric stimulators of sGC that are of interest for treating hypertension, overcome E3CaG1-mediated inhibition of NO-ligated sGC. Taken together, these data suggest that sGC not only lowers [Ca(2+)](i) in response to NO, inducing vasodilation, but also is inhibited by high [Ca(2+)](i), providing a fine balance between signals for vasodilation and vasoconstriction.
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Affiliation(s)
- Saumya Ramanathan
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, Arizona 85721, United States
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9
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Yang D, Elner SG, Chen X, Field MG, Petty HR, Elner VM. MCP-1-activated monocytes induce apoptosis in human retinal pigment epithelium. Invest Ophthalmol Vis Sci 2011; 52:6026-34. [PMID: 21447688 DOI: 10.1167/iovs.10-7023] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
PURPOSE The inflammatory response in age-related macular degeneration (AMD) is characterized by mononuclear leukocyte infiltration of the outer blood-retina barrier formed by the retinal pigment epithelium (RPE). A key mechanistic element in AMD progression is RPE dysfunction and apoptotic cell loss. The purpose of this study was to evaluate whether monocyte chemoattractant protein (MCP)-1-activated monocytes induce human RPE apoptosis and whether Ca(2+) and reactive oxygen species (ROS) are involved in this process. METHODS A cell-based fluorometric assay was used to measure intracellular Ca(2+) concentrations ([Ca(2+)](i)) in RPE cells loaded with fluorescent Ca(2+) indicator. Intracellular RPE ROS levels were measured by using the 5- and 6-chloromethyl-2',7'-dichlorodihydrofluorescence diacetate acetyl ester (CM-H(2)DCFDA) assay. RPE apoptosis was evaluated by activated caspase-3, Hoechst staining, and apoptosis ELISA. RESULTS MCP-1-activated human monocytes increased [Ca(2+)](i), ROS levels, and apoptosis in RPE cells, all of which were inhibited by 8-bromo-cyclic adenosine diphosphoribosyl ribose (8-Br-cADPR), an antagonist of cADPR. Although the ROS scavengers pyrrolidinedithiocarbamate (PDTC) and N-acetylcysteine (NAC) significantly inhibited ROS production and apoptosis induced by activated monocytes, they did not affect induced Ca(2+) levels. The induced Ca(2+) levels and apoptosis in RPE cells were inhibited by an antibody against cluster of differentiation antigen 14 (CD14), an adhesion molecule expressed by these cells. CONCLUSIONS These results indicate that CD14, Ca(2+), and ROS are involved in activated monocyte-induced RPE apoptosis and that cADPR contributes to these changes. Understanding the complex interactions among CD14, cADPR, Ca(2+), and ROS may provide new insights and treatments of retinal diseases, including AMD.
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Affiliation(s)
- Dongli Yang
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan 48105-0714, USA
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10
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Lin CY, Hilgenberg LGW, Smith MA, Lynch G, Gall CM. Integrin regulation of cytoplasmic calcium in excitatory neurons depends upon glutamate receptors and release from intracellular stores. Mol Cell Neurosci 2008; 37:770-80. [PMID: 18289871 DOI: 10.1016/j.mcn.2008.01.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2007] [Revised: 11/27/2007] [Accepted: 01/03/2008] [Indexed: 01/12/2023] Open
Abstract
Integrins regulate cytoplasmic calcium levels ([Ca(2+)]i) in various cell types but information on activities in neurons is limited. The issue is of current interest because of the evidence that both integrins and changes in [Ca(2+)]i are required for Long-Term Potentiation. Accordingly, the present studies evaluated integrin ligand effects in cortical neurons. Integrin ligands or alpha5beta1 integrin activating antisera rapidly increased [Ca(2+)]i with effects greater in glutamatergic than GABAergic neurons, absent in astroglia, and blocked by beta1 integrin neutralizing antisera and the tyrosine kinase antagonist genistein. Increases depended upon extracellular calcium and intracellular store release. Ligand-induced effects were reduced by voltage-sensitive calcium channel and NMDA receptor antagonists, but blocked by tetrodotoxin or AMPA receptor antagonists. These results indicate that integrin ligation triggers AMPA receptor/depolarization-dependent calcium influx followed by intracellular store release and suggest the possibility that integrin modulation of activity-induced changes in [Ca(2+)]i contributes importantly to lasting synaptic plasticity in forebrain neurons.
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Affiliation(s)
- C-Y Lin
- Department of Anatomy and Neurobiology, University of California, Irvine CA 92697-4292, USA
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11
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Wang J, Mayernik L, Armant DR. Trophoblast adhesion of the peri-implantation mouse blastocyst is regulated by integrin signaling that targets phospholipase C. Dev Biol 2007; 302:143-53. [PMID: 17027741 PMCID: PMC1894903 DOI: 10.1016/j.ydbio.2006.09.015] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2006] [Revised: 08/21/2006] [Accepted: 09/06/2006] [Indexed: 10/24/2022]
Abstract
Integrin signaling modulates trophoblast adhesion to extracellular matrices during blastocyst implantation. Fibronectin (FN)-binding activity on the apical surface of trophoblast cells is strengthened after elevation of intracellular Ca(2+) downstream of integrin ligation by FN. We report here that phosphoinositide-specific phospholipase C (PLC) mediates Ca(2+) signaling in response to FN. Pharmacological agents used to antagonize PLC (U73122) or the inositol phosphate receptor (Xestospongin C) inhibited FN-induced elevation of intracellular Ca(2+) and prevented the upregulation of FN-binding activity. In contrast, inhibitors of Ca(2+) influx through either voltage-gated or non-voltage-gated Ca(2+) channels were without effect. Inhibition of protein tyrosine kinase activity by genistein, but not G-protein inhibition by suramin, blocked FN-induced intracellular Ca(2+) signaling and upregulation of adhesion, consistent with involvement of PLC-gamma. Confocal immunofluorescence imaging of peri-implantation blastocysts demonstrated that PLC-gamma2, but not PLC-gamma1 nor PLC-beta1, accumulated near the outer surface of the embryo. Phosphotyrosine site-directed antibodies revealed phosphorylation of PLC-gamma2, but not PLC-gamma1, upon integrin ligation by FN. These data suggest that integrin-mediated activation of PLC-gamma to initiate phosphoinositide signaling and intracellular Ca(2+) mobilization is required for blastocyst adhesion to FN. Signaling cascades regulating PLC-gamma could, therefore, control a critical feature of trophoblast differentiation during peri-implantation development.
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Affiliation(s)
- Jun Wang
- C. S. Mott Center for Human Growth and Development, Departments of Anatomy and Cell Biology, and Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, Michigan 48201
| | - Linda Mayernik
- C. S. Mott Center for Human Growth and Development, Departments of Anatomy and Cell Biology, and Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, Michigan 48201
| | - D. Randall Armant
- C. S. Mott Center for Human Growth and Development, Departments of Anatomy and Cell Biology, and Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, Michigan 48201
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12
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Liang LR, Lu S, Wang X, Lu Y, Mandal V, Patacsil D, Kumar D. FM-test: a fuzzy-set-theory-based approach to differential gene expression data analysis. BMC Bioinformatics 2006; 7 Suppl 4:S7. [PMID: 17217525 PMCID: PMC1780132 DOI: 10.1186/1471-2105-7-s4-s7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Background Microarray techniques have revolutionized genomic research by making it possible to monitor the expression of thousands of genes in parallel. As the amount of microarray data being produced is increasing at an exponential rate, there is a great demand for efficient and effective expression data analysis tools. Comparison of gene expression profiles of patients against those of normal counterpart people will enhance our understanding of a disease and identify leads for therapeutic intervention. Results In this paper, we propose an innovative approach, fuzzy membership test (FM-test), based on fuzzy set theory to identify disease associated genes from microarray gene expression profiles. A new concept of FM d-value is defined to quantify the divergence of two sets of values. We further analyze the asymptotic property of FM-test, and then establish the relationship between FM d-value and p-value. We applied FM-test to a diabetes expression dataset and a lung cancer expression dataset, respectively. Within the 10 significant genes identified in diabetes dataset, six of them have been confirmed to be associated with diabetes in the literature and one has been suggested by other researchers. Within the 10 significantly overexpressed genes identified in lung cancer data, most (eight) of them have been confirmed by the literatures which are related to the lung cancer. Conclusion Our experiments on synthetic datasets show that FM-test is effective and robust. The results in diabetes and lung cancer datasets validated the effectiveness of FM-test. FM-test is implemented as a Web-based application and is available for free at .
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Affiliation(s)
- Lily R Liang
- Department of Computer Science and Information Technology, University of the District of Columbia, Washington, DC, 20008, USA
| | - Shiyong Lu
- Department of Computer Science, Wayne State University, Detroit, MI, 48202, USA
| | | | - Yi Lu
- Department of Computer Science, Wayne State University, Detroit, MI, 48202, USA
| | - Vinay Mandal
- Department of Computer Science, Wayne State University, Detroit, MI, 48202, USA
| | - Dorrelyn Patacsil
- Department of Biological and Environmental Sciences, University of the District of Columbia, Washington, DC, 20008, USA
| | - Deepak Kumar
- Department of Biological and Environmental Sciences, University of the District of Columbia, Washington, DC, 20008, USA
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13
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Kirchberger T, Wagner G, Xu J, Cordiglieri C, Wang P, Gasser A, Fliegert R, Bruhn S, Flügel A, Lund FE, Zhang LH, Potter BVL, Guse AH. Cellular effects and metabolic stability of N1-cyclic inosine diphosphoribose and its derivatives. Br J Pharmacol 2006; 149:337-44. [PMID: 16967053 PMCID: PMC1978434 DOI: 10.1038/sj.bjp.0706869] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND AND PURPOSE Recently, a number of mimics of the second messenger cyclic ADP-ribose (cADPR) with replacement of adenosine by inosine were introduced. In addition, various alterations in the molecule ranging from substitutions at C8 of the base up to full replacement of the ribose moieties still retained biological activity. However, nothing is known about the metabolic stability and cellular effects of these novel analogues. EXPERIMENTAL APPROACH cADPR and the inosine-based analogues were incubated with CD38, ADP-ribosyl cyclase and NAD-glycohydrolase and metabolism was analysed by RP-HPLC. Furthermore, the effect of the analogues on cytokine expression and proliferation was investigated in primary T-lymphocytes and T-lymphoma cells. KEY RESULTS Incubation of cADPR with CD38 resulted in degradation to adenosine diphosphoribose. ADP-ribosyl cyclase weakly catabolised cADPR whereas NAD-glycohydrolase showed no such activity. In contrast, N1-cyclic inosine 5'-diphosphoribose (N1-cIDPR) was not hydrolyzed by CD38. Three additional N1-cIDPR analogues showed a similar stability. Proliferation of Jurkat T-lymphoma cells was inhibited by N1-cIDPR, N1-[(phosphoryl-O-ethoxy)-methyl]-N9-[(phosphoryl-O-ethoxy)-methyl]-hypoxanthine-cyclic pyrophosphate (N1-cIDP-DE) and N1-ethoxymethyl-cIDPR (N1-cIDPRE). In contrast, in primary T cells neither proliferation nor cytokine expression was affected by these compounds. CONCLUSIONS AND IMPLICATIONS The metabolic stability of N1-cIDPR and its analogues provides an advantage for the development of novel pharmaceutical compounds interfering with cADPR mediated Ca2+ signalling pathways. The differential effects of N1-cIDPR and N1-cIDPRE on proliferation and cytokine expression in primary T cells versus T-lymphoma cells may constitute a starting point for novel anti-tumor drugs.
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Affiliation(s)
- T Kirchberger
- Centre of Experimental Medicine, Institute of Biochemistry and Molecular Biology I: Cellular Signal Transduction, University Medical Centre Hamburg-Eppendorf Hamburg, Germany
| | - G Wagner
- Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath Bath, UK
| | - J Xu
- National Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University Beijing, China
| | - C Cordiglieri
- Department of Neuroimmunology, Max-Planck-Institute for Neurobiology Martinsried, Germany
| | - P Wang
- National Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University Beijing, China
| | - A Gasser
- Centre of Experimental Medicine, Institute of Biochemistry and Molecular Biology I: Cellular Signal Transduction, University Medical Centre Hamburg-Eppendorf Hamburg, Germany
| | - R Fliegert
- Centre of Experimental Medicine, Institute of Biochemistry and Molecular Biology I: Cellular Signal Transduction, University Medical Centre Hamburg-Eppendorf Hamburg, Germany
| | - S Bruhn
- Centre of Experimental Medicine, Institute of Biochemistry and Molecular Biology I: Cellular Signal Transduction, University Medical Centre Hamburg-Eppendorf Hamburg, Germany
| | - A Flügel
- Department of Neuroimmunology, Max-Planck-Institute for Neurobiology Martinsried, Germany
| | - F E Lund
- Trudeau Institute Saranac Lake, NY, USA
| | - L-h Zhang
- National Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University Beijing, China
| | - B V L Potter
- Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath Bath, UK
| | - A H Guse
- Centre of Experimental Medicine, Institute of Biochemistry and Molecular Biology I: Cellular Signal Transduction, University Medical Centre Hamburg-Eppendorf Hamburg, Germany
- Author for correspondence:
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14
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Umesh A, Thompson MA, Chini EN, Yip KP, Sham JSK. Integrin ligands mobilize Ca2+ from ryanodine receptor-gated stores and lysosome-related acidic organelles in pulmonary arterial smooth muscle cells. J Biol Chem 2006; 281:34312-23. [PMID: 16963791 DOI: 10.1074/jbc.m606765200] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Extracellular matrix (ECM) protein receptors, or integrins, participate in vascular remodeling and the systemic myogenic response. Synthetic ligands and ECM fragments regulate the vascular smooth muscle cell contractile state by altering intracellular Ca2+ levels ([Ca2+]i). Information on the Ca2+ effect of integrins in vascular smooth muscle cells is limited, but nonexistent in pulmonary arterial smooth muscle cells (PASMCs). We therefore characterized integrin expression in endothelium-denuded pulmonary arteries, and explored [Ca2+]i mobilization pathways induced by soluble ligands in rat PASMCs. Reverse transcriptase-PCR showed mRNA expression of integrins alpha1, alpha2, alpha3, alpha4, alpha5, alpha7, alpha8, alpha(v), beta1, beta3, and beta4, and immunoblots of alpha5, alpha(v), beta1, and beta3 confirmed protein expression. Exposure of PASMCs to integrin-binding peptides (0.5 mM) containing the arginine-glycine-aspartate (RGD) motif elicited [Ca2+]i responses with an order of potency of GRGDNP > GRGDSP > GRGDTP = cyclo-RGD. Pharmacological analysis revealed that the GRGDSP-induced Ca2+ response was unrelated to Ca2+ influx and the inositol triphosphate receptor-gated Ca2+ store, but partially blocked by ryanodine or inhibition of lysosome-related acidic organelles with bafilomycin A1. Simultaneous inhibition of both pathways was necessary to abolish the response. GRGDSP treatment increased cyclic ADP-ribose, the endogenous activator of ryanodine receptors, by 70%. GRGDSP also rapidly reduced Lysotracker Red accumulation, confirming direct modulation of acidic organelles. These data are the first demonstration of integrin-mediated Ca2+ regulation in PASMCs. The presence of an array of integrins, and activation of ryanodine-sensitive Ca2+ stores and lysosome-like organelles by GRGDSP suggest important roles for integrin-dependent Ca2+ signaling in regulating PASMC function.
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MESH Headings
- Animals
- Blotting, Western
- Calcium/metabolism
- Calcium Signaling
- Cells, Cultured
- Fluorescence
- Integrins/metabolism
- Ligands
- Lysosomes/metabolism
- Male
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Oligopeptides/pharmacology
- Organelles/metabolism
- Peptide Fragments/pharmacology
- Protein Binding
- Pulmonary Artery/cytology
- Pulmonary Artery/drug effects
- Pulmonary Artery/metabolism
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Rats
- Rats, Wistar
- Reverse Transcriptase Polymerase Chain Reaction
- Ryanodine/pharmacology
- Ryanodine Receptor Calcium Release Channel/metabolism
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Affiliation(s)
- Anita Umesh
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21224, USA
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15
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Andersson SV, Hamm-Alvarez SF, Gierow JP. Integrin adhesion in regulation of lacrimal gland acinar cell secretion. Exp Eye Res 2006; 83:543-53. [PMID: 16631165 DOI: 10.1016/j.exer.2006.02.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2005] [Revised: 01/18/2006] [Accepted: 02/08/2006] [Indexed: 01/24/2023]
Abstract
The extracellular microenvironment regulates lacrimal gland acinar cell secretion. Culturing isolated rabbit lacrimal gland acinar cells on different extracellular matrix proteins revealed that laminin enhances carbachol-stimulated secretion to a greater extent than other extracellular matrix proteins investigated. Furthermore, immunofluorescence indicated that integrin subunits, potentially functioning as laminin receptors are present in acinar cells. Among these, the integrin alpha6 and beta1 subunit mRNA expression was also confirmed by RT-PCR and sequence analysis. Secretion assays, which measured beta-hexosaminidase activity released in the culture media, demonstrated that function-blocking integrin alpha6 and beta1 monoclonal antibodies (mAbs) induce a rapid, transient and dose-dependent secretory response in cultured cells. To determine the intracellular pathways by which integrin alpha6 and beta1 mAbs could induce secretion, selected second messenger molecules were inhibited. Although inhibitors of protein kinase C and IP(3)-induced Ca(2+) mobilization attenuated carbachol-stimulated secretion, no effect on integrin mAb-induced release was observed. In addition, protein tyrosine kinases do not appear to have a role in transducing signals arising from mAb interactions. Our data clearly demonstrate, though, that cell adhesion through integrins regulates secretion from lacrimal gland acinar cells. The fact that the integrin mAbs affect the cholinergic response differently and that the integrin beta1 mAb secretion, but not the alpha6, was attenuated by the phosphatase inhibitor, sodium orthovanadate, suggests that each subunit utilizes separate intracellular signaling pathways to induce exocytosis. The results also indicate that the secretory response triggered by the beta1 integrin mAb is generated through dephosphorylation events.
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Affiliation(s)
- Sofia V Andersson
- Department of Chemistry and Biomedical Sciences, University of Kalmar, SE-391 82 Kalmar, Sweden
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16
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Liao Y, Asakura M, Takashima S, Kato H, Asano Y, Shintani Y, Minamino T, Tomoike H, Hori M, Kitakaze M. Amlodipine ameliorates myocardial hypertrophy by inhibiting EGFR phosphorylation. Biochem Biophys Res Commun 2005; 327:1083-7. [PMID: 15652507 DOI: 10.1016/j.bbrc.2004.12.112] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2004] [Indexed: 11/26/2022]
Abstract
The effects of long-acting calcium channel blockers on pressure overload-induced cardiac hypertrophy have been little studied in experimental animals and the underlying mechanisms are not fully understood. We previously reported that cardiomyocyte hypertrophy could be induced via phosphorylation of the epidermal growth factor receptor (EGFR). In this study, we investigated whether amlodipine attenuates cardiac hypertrophy by inhibiting EGFR phosphorylation. We found that amlodipine dose-dependently inhibited epinephrine-induced protein synthesis and EGFR phosphorylation in cultured neonatal rat cardiomyocytes. Our in vivo study revealed that amlodipine could ameliorate myocardial hypertrophy induced by transverse aortic constriction (TAC) in C57/B6 mice. One week after TAC, amlodipine treatment (3 mg/kg/day) significantly reduced the heart-to-body weight ratio (6.04 +/- 0.16 mg/g vs. 6.90 +/- 0.45 mg/g in untreated TAC mice, P < 0.01). These results indicate that amlodipine ameliorates cardiomyocyte hypertrophy via inhibition of EGFR phosphorylation.
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Affiliation(s)
- Yulin Liao
- Department of Internal Medicine and Therapeutics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0781, Japan
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17
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Priester J, Smith WA. Inhibition of tyrosine phosphorylation blocks hormone-stimulated calcium influx in an insect steroidogenic gland. Mol Cell Endocrinol 2005; 229:185-92. [PMID: 15607542 DOI: 10.1016/j.mce.2004.07.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2004] [Revised: 06/30/2004] [Accepted: 07/06/2004] [Indexed: 01/29/2023]
Abstract
In the tobacco hornworm Manduca sexta (M. sexta) as in other insects, ecdysone synthesis occurs in the prothoracic glands and is stimulated by the brain neuropeptide prothoracicotropic hormone (PTTH). PTTH activates the prothoracic glands through the second messenger cAMP, the synthesis of which is stimulated by calcium. We previously found that the Src kinase inhibitor 4-amino-5-(4-methylphenyl)-7-(t-butyl)pyrazolo[3,4-D]-pyrimidine (PP1) inhibits PTTH-stimulated cAMP synthesis and ecdysone secretion. In the present study, we show that by contrast, PP1 does not block cAMP synthesis stimulated by the calcium ionophore A23187, and that PP1 augments A23187-stimulated ecdysone secretion. Hence, once glandular levels of calcium are elevated, Src family kinase activity is no longer needed for, and may actually inhibit, steroidogenesis. PP1 blocks calcium influx in PTTH-stimulated prothoracic glands, indicating that tyrosine phosphorylation by a member of the Src kinase family is required for calcium influx. These results suggest that prothoracic gland calcium channels are regulated either directly or indirectly by tyrosine phosphorylation.
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Affiliation(s)
- Jennifer Priester
- Department of Biology, 433 Richards Hall, Northeastern University, 360 Huntington Ave, Boston, MA 02115, USA
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18
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Wonerow P, Pearce AC, Vaux DJ, Watson SP. A critical role for phospholipase Cgamma2 in alphaIIbbeta3-mediated platelet spreading. J Biol Chem 2003; 278:37520-9. [PMID: 12832411 DOI: 10.1074/jbc.m305077200] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The interaction of fibrinogen with the integrin alphaIIbbeta3 plays a crucial role in platelet adhesion and platelet activation leading to the generation of intracellular signals that nucleate the reorganization of the cytoskeleton. Presently, we have only a limited understanding of the signaling cascades and effector proteins through which changes in the cytoskeletal architecture are mediated. The present study identifies phospholipase Cgamma2 (PLCgamma2) as an important target of the Src-dependent signaling cascade regulated by alphaIIbbeta3. Real time phasecontrast microscopy is used to show that formation of filopodia and lamellapodia in murine platelets on a fibrinogen surface is dramatically inhibited in the absence of PLCgamma2. Significantly, the formation of these structures is mediated by Ca2+ elevation and activation of protein kinase C, both directly regulated by PLC activity. With the involvement of Syk, SLP-76, and Btk, alphaIIbbeta3-induced PLCgamma2 activation partly overlaps with the pathway used by the collagen receptor glycoprotein VI. Important differences, however, exist between the two signaling cascades in that activation of PLCgamma2 by alphaIIbbeta3 is unaltered in murine platelets, which lack the FcR gamma-chain or the adaptor LAT, but is abolished in the presence of cytochalasin D. Therefore, PLCgamma2 plays not only a crucial role in activation of alphaIIbbeta3 by collagen receptors but also in alphaIIbbeta3-mediated responses.
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Affiliation(s)
- Peter Wonerow
- Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, United Kingdom.
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19
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Gall CM, Pinkstaff JK, Lauterborn JC, Xie Y, Lynch G. Integrins regulate neuronal neurotrophin gene expression through effects on voltage-sensitive calcium channels. Neuroscience 2003; 118:925-40. [PMID: 12732238 DOI: 10.1016/s0306-4522(02)00990-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Integrin adhesion receptors regulate gene expression during growth and differentiation in various cell types. Recent work, implicating integrins in functional synaptic plasticity, suggest they may have similar activities in adult brain. The present study tested if integrins binding the arginine-glycine-aspartate (RGD) matrix sequence regulate neurotrophin and neurotrophin receptor gene expression in cultured hippocampal slices. The soluble RGD-containing peptide glycine-arginine-glycine-aspartate-serine-proline (GRGDSP) increased neurotrophin mRNA levels in transcript- and subfield-specific fashions. Integrin ligand effects were greatest for brain-derived neurotrophic factor transcripts I and II and barely detectable for transcript III. In accordance with increased nerve growth factor mRNA levels, GRGDSP increased c-fos expression as well. In contrast, growth-associated protein-43, amyloid precursor protein and fibroblast growth factor-1 mRNAs were not elevated. Ligand effects on brain-derived neurotrophic factor transcript II and c-fos mRNA did not depend on the integrity of the actin cytoskeleton, neuronal activity, or various signaling pathways but were blocked by L-type voltage-sensitive calcium-channel blockers. These results indicate that in mature hippocampal neurons integrin engagement regulates expression of a subset of growth-related genes at least in part through effects on calcium influx. Accordingly, these synaptic adhesion receptors may play the same role in maintaining an adult, differentiated state in brain as they do in other tissues and changes in integrin activation and/or engagement may contribute to dynamic changes in neurotrophin expression and to neuronal calcium signaling.
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MESH Headings
- Anesthetics, Local/pharmacology
- Animals
- Animals, Newborn
- Brain-Derived Neurotrophic Factor/genetics
- Brain-Derived Neurotrophic Factor/metabolism
- Calcium Channel Blockers/pharmacology
- Calcium Channels/physiology
- Carbazoles/pharmacology
- Cytochalasin D/pharmacology
- Dose-Response Relationship, Drug
- Drug Interactions
- Enzyme Inhibitors/pharmacology
- Exons/drug effects
- Exons/genetics
- Gene Expression Regulation
- Genes, fos/drug effects
- Glycoproteins/pharmacology
- Hippocampus/cytology
- Hippocampus/drug effects
- Hippocampus/metabolism
- Immunohistochemistry/methods
- In Situ Hybridization/methods
- In Vitro Techniques
- Indole Alkaloids
- Integrins/physiology
- Neurotrophin 3/metabolism
- Nifedipine/pharmacology
- Nimodipine/pharmacology
- Nucleic Acid Synthesis Inhibitors/pharmacology
- Oligopeptides/classification
- Oligopeptides/pharmacology
- RNA Precursors/metabolism
- RNA, Messenger/biosynthesis
- Rats
- Rats, Sprague-Dawley
- Receptor, trkB/genetics
- Receptor, trkB/metabolism
- Receptor, trkC/genetics
- Receptor, trkC/metabolism
- Sesterterpenes
- Terpenes/pharmacology
- Tetrodotoxin/pharmacology
- Time Factors
- Transcription, Genetic/drug effects
- Trifluoperazine/analogs & derivatives
- Trifluoperazine/pharmacology
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Affiliation(s)
- C M Gall
- Department of Anatomy and Neurobiology, University of California at Irvine, Irvine, CA 92697-4292, USA.
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20
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Schwarzmann N, Kunerth S, Weber K, Mayr GW, Guse AH. Knock-down of the type 3 ryanodine receptor impairs sustained Ca2+ signaling via the T cell receptor/CD3 complex. J Biol Chem 2002; 277:50636-42. [PMID: 12354756 DOI: 10.1074/jbc.m209061200] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In Jurkat T cells, the type 3 ryanodine receptor (RyR) was knocked-down by stable integration of plasmid expressing type 3 ryanodine receptor antisense RNA. Stable integration of the antisense plasmid in individual clones was demonstrated by PCR of genomic DNA, expression of antisense RNA by reverse transcriptase PCR, and efficiently reduced expression of type 3 ryanodine receptor protein by Western blot. Selected clones were successfully used to analyze T cell receptor/CD3 complex-mediated Ca(2+) signaling. Reduced expression of the type 3 RyR resulted in (i) significantly decreased Ca(2+) signaling in the sustained phase and (ii) in permeabilized cells in a significantly impaired response toward cyclic ADP-ribose but not to d-myo-inositol 1,4,5-trisphosphate. For the first time, the role of the type 3 RyR in sustained Ca(2+) signaling was directly visualized by confocal Ca(2+) imaging as a significant contribution to the number and the magnitude of subcellular Ca(2+) signals. These data suggest that the type 3 ryanodine receptor is essential in the sustained Ca(2+) response in T cells.
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Affiliation(s)
- Nadine Schwarzmann
- University Hospital Hamburg-Eppendorf, Center for Theoretical Medicine, Institute for Cellular Signal Transduction, Martinistr. 52, D-20246 Hamburg, Germany
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