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Berra-Romani R, Vargaz-Guadarrama A, Sánchez-Gómez J, Coyotl-Santiago N, Hernández-Arambide E, Avelino-Cruz JE, García-Carrasco M, Savio M, Pellavio G, Laforenza U, Lagunas-Martínez A, Moccia F. Histamine activates an intracellular Ca2+ signal in normal human lung fibroblast WI-38 cells. Front Cell Dev Biol 2022; 10:991659. [PMID: 36120576 PMCID: PMC9478493 DOI: 10.3389/fcell.2022.991659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 08/08/2022] [Indexed: 11/13/2022] Open
Abstract
Histamine is an inflammatory mediator that can be released from mast cells to induce airway remodeling and cause persistent airflow limitation in asthma. In addition to stimulating airway smooth muscle cell constriction and hyperplasia, histamine promotes pulmonary remodeling by inducing fibroblast proliferation, contraction, and migration. It has long been known that histamine receptor 1 (H1R) mediates the effects of histamine on human pulmonary fibroblasts through an increase in intracellular Ca2+ concentration ([Ca2+]i), but the underlying signaling mechanisms are still unknown. Herein, we exploited single-cell Ca2+ imaging to assess the signal transduction pathways whereby histamine generates intracellular Ca2+ signals in the human fetal lung fibroblast cell line, WI-38. WI-38 fibroblasts were loaded with the Ca2+-sensitive fluorophore, FURA-2/AM, and challenged with histamine in the absence and presence of specific pharmacological inhibitors to dissect the Ca2+ release/entry pathways responsible for the onset of the Ca2+ response. Histamine elicited complex intracellular Ca2+ signatures in WI-38 fibroblasts throughout a concentration range spanning between 1 µM and 1 mM. In accord, the Ca2+ response to histamine adopted four main temporal patterns, which were, respectively, termed peak, peak-oscillations, peak-plateau-oscillations, and peak-plateau. Histamine-evoked intracellular Ca2+ signals were abolished by pyrilamine, which selectively blocks H1R, and significantly reduced by ranitidine, which selectively inhibits H2R. Conversely, the pharmacological blockade of H3R and H4R did not affect the complex increase in [Ca2+]i evoked by histamine in WI-38 fibroblasts. In agreement with these findings, histamine-induced intracellular Ca2+ signals were initiated by intracellular Ca2+ release from the endoplasmic reticulum through inositol-1,4,5-trisphosphate (InsP3) receptors (InsP3R) and sustained by store-operated Ca2+ channels (SOCs). Conversely, L-type voltage-operated Ca2+ channels did not support histamine-induced extracellular Ca2+ entry. A preliminary transcriptomic analysis confirmed that WI-38 human lung fibroblasts express all the three InsP3R isoforms as well as STIM2 and Orai3, which represent the molecular components of SOCs. The pharmacological blockade of InsP3 and SOC, therefore, could represent an alternative strategy to prevent the pernicious effects of histamine on lung fibroblasts in asthmatic patients.
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Affiliation(s)
- Roberto Berra-Romani
- Department of Biomedicine, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, México
- *Correspondence: Roberto Berra-Romani, ; Francesco Moccia,
| | - Ajelet Vargaz-Guadarrama
- Department of Biomedicine, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, México
| | - Josué Sánchez-Gómez
- Department of Biomedicine, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, México
| | - Nayeli Coyotl-Santiago
- Department of Biomedicine, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, México
| | - Efraín Hernández-Arambide
- Department of Biomedicine, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, México
| | - José Everardo Avelino-Cruz
- Laboratory of Molecular Cardiology, Institute of Physiology, Benemérita Universidad Autónoma de Puebla, Puebla, México
| | - Mario García-Carrasco
- Department of Immunology, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, México
| | - Monica Savio
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Giorgia Pellavio
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | | | - Alfredo Lagunas-Martínez
- Direction of Chronic Infections and Cancer, Research Center in Infection Diseases, National Institute of Public Health, Morelos, México
| | - Francesco Moccia
- Laboratory of General Physiology, Department of Biology and Biotechnology “Lazzaro Spallanzani”, University of Pavia, Pavia, Italy
- *Correspondence: Roberto Berra-Romani, ; Francesco Moccia,
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Optogenetic control of mitochondrial metabolism and Ca 2+ signaling by mitochondria-targeted opsins. Proc Natl Acad Sci U S A 2017; 114:E5167-E5176. [PMID: 28611221 DOI: 10.1073/pnas.1703623114] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Key mitochondrial functions such as ATP production, Ca2+ uptake and release, and substrate accumulation depend on the proton electrochemical gradient (ΔμH+) across the inner membrane. Although several drugs can modulate ΔμH+, their effects are hardly reversible, and lack cellular specificity and spatial resolution. Although channelrhodopsins are widely used to modulate the plasma membrane potential of excitable cells, mitochondria have thus far eluded optogenetic control. Here we describe a toolkit of optometabolic constructs based on selective targeting of channelrhodopsins with distinct functional properties to the inner mitochondrial membrane of intact cells. We show that our strategy enables a light-dependent control of the mitochondrial membrane potential (Δψm) and coupled mitochondrial functions such as ATP synthesis by oxidative phosphorylation, Ca2+ dynamics, and respiratory metabolism. By directly modulating Δψm, the mitochondria-targeted opsins were used to control complex physiological processes such as spontaneous beats in cardiac myocytes and glucose-dependent ATP increase in pancreatic β-cells. Furthermore, our optometabolic tools allow modulation of mitochondrial functions in single cells and defined cell regions.
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Miyamoto A, Mikoshiba K. Probes for manipulating and monitoring IP 3. Cell Calcium 2016; 64:57-64. [PMID: 27887748 DOI: 10.1016/j.ceca.2016.11.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 11/14/2016] [Indexed: 12/31/2022]
Abstract
Inositol 1,4,5-trisphosphate (IP3) is an important second messenger produced via G-protein-coupled receptor- or receptor tyrosine kinase-mediated pathways. IP3 levels induce Ca2+ release from the endoplasmic reticulum (ER) via IP3 receptor (IP3R) located in the ER membrane. The resultant spatiotemporal pattern of Ca2+ signals regulates diverse cellular functions, including fertilization, gene expression, synaptic plasticity, and cell death. Therefore, monitoring and manipulating IP3 levels is important to elucidate not only the functions of IP3-mediated pathways but also the encoding mechanism of IP3R as a converter of intracellular signals from IP3 to Ca2+.
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Affiliation(s)
- Akitoshi Miyamoto
- Laboratory for Developmental Neurobiology, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Katsuhiko Mikoshiba
- Laboratory for Developmental Neurobiology, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
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Li J, Zhao X, Wang D, He W, Zhang S, Cao W, Huang Y, Wang L, Zhou S, Luo K. Up-regulated expression of phospholipase C, β1 is associated with tumor cell proliferation and poor prognosis in hepatocellular carcinoma. Onco Targets Ther 2016; 9:1697-706. [PMID: 27051304 PMCID: PMC4807949 DOI: 10.2147/ott.s97189] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Background Phospholipase C, β1 (PLCB1) plays critical roles in intracellular transduction and regulating signal activation which are important to tumorigenesis. However, the mechanism of PLCB1 in hepatocellular carcinoma (HCC) is still unknown. This study aims to investigate whether its expression is associated with the clinicopathological parameters and prognosis of the patients with HCC. Methods Immunohistochemistry on two tissue microarrays containing 141 cases of HCC tissues and adjacent non-tumorous tissues were performed to analyze the correlation between PLCB1 expression and clinicopathological features. Kaplan–Meier analysis and Cox multivariate analysis were performed to determine the PLCB1 expression in HCC prognosis. Furthermore, effects of PLCB1 on proliferation of HCC cells were explored using a colony formation assay and apoptosis assay. Results We identified that PLCB1 expression was significantly higher in tumor tissues than that in adjacent non-tumorous tissues and associated with advanced tumor stage. Kaplan–Meier survival analysis showed that patients with PLCB1-positive tumors had poorer survival than the patients with PLCB1-negative tumors. In multivariate analyses, PLCB1 expression was an independent prognostic factor. Moreover, overexpression of PLCB1 in HCC cells promoted cell proliferation and inhibited apoptosis, while knocking down PLCB1 reduced cell viability in vitro. Further investigation found that activation of ERK signaling might involve in PLCB1-mediated cell growth. Conclusion Our study suggests that PLCB1 promotes the progression of HCC and can be served as an independent prognostic factor and a promising therapeutic target in HCC.
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Affiliation(s)
- Junxiang Li
- Department of Interventional Radiology, Cancer Hospital of Guizhou Medical University, Guiyang, People's Republic of China
| | - Xuya Zhao
- Department of Interventional Radiology, Cancer Hospital of Guizhou Medical University, Guiyang, People's Republic of China
| | - Dazhi Wang
- Department of Interventional Radiology, Cancer Hospital of Guizhou Medical University, Guiyang, People's Republic of China
| | - Wei He
- Department of Interventional Radiology, Cancer Hospital of Guizhou Medical University, Guiyang, People's Republic of China
| | - Shuai Zhang
- Department of Interventional Radiology, Cancer Hospital of Guizhou Medical University, Guiyang, People's Republic of China
| | - Wei Cao
- Department of Interventional Radiology, Cancer Hospital of Guizhou Medical University, Guiyang, People's Republic of China
| | - Yu Huang
- Department of Interventional Radiology, Cancer Hospital of Guizhou Medical University, Guiyang, People's Republic of China
| | - Ling Wang
- Department of Interventional Radiology, Cancer Hospital of Guizhou Medical University, Guiyang, People's Republic of China
| | - Shi Zhou
- Department of Interventional Radiology, Cancer Hospital of Guizhou Medical University, Guiyang, People's Republic of China
| | - Kaijian Luo
- Department of Oncology, GuiZhou Cancer Hospital, Cancer Hospital of Guizhou Medical University, Guiyang, People's Republic of China
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Lo Vasco VR, Leopizzi M, Di Maio V, Della Rocca C. U-73122 reduces the cell growth in cultured MG-63 ostesarcoma cell line involving Phosphoinositide-specific Phospholipases C. SPRINGERPLUS 2016; 5:156. [PMID: 27026853 PMCID: PMC4766154 DOI: 10.1186/s40064-016-1768-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 02/12/2016] [Indexed: 11/24/2022]
Abstract
The definition of the number and nature of the signal transduction pathways involved in the pathogenesis and the identification of the molecules promoting metastasis spread might improve the knowledge of the natural history of osteosarcoma, also allowing refine the prognosis and opening the way to novel therapeutic strategies. Phosphatydil inositol (4,5) bisphosphate (PIP2), belonging to the Phosphoinositide (PI) signal transduction pathway, was related to the regulation of ezrin, an ezrin-radixin-moesin protein involved in metastatic osteosarcoma spread. The levels of PIP2 are regulated by means of the PI-specific Phospholipase C (PLC) enzymes. Recent literature data suggested that in osteosarcoma the panel of expression of PLC isoforms varies in a complex and unclear manner and is related to ezrin, probably networking with Ras GTPases, such as RhoA and Rac1. We analyzed the expression and the subcellular localization of PLC enzymes in cultured human osteosarcoma MG-63 cells, commonly used as an experimental model for human osteoblasts, using U-73122 PLC inhibitor, U-73343 inactive analogue, and by silencing ezrin. The treatment with U-73122 significantly reduces the number of MG-63 viable cells and contemporarily modifies the expression and the subcellular localization of selected PLC isoforms. U-73122 reduces the cell growth in cultured MG-63 ostesarcoma cell line involving PI-specific Phospholipases C.
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Affiliation(s)
- Vincenza Rita Lo Vasco
- />Sensory Organs Department, Policlinico Umberto I, Faculty of Medicine and Dentistry, Sapienza University of Rome, viale dell’Università, 33, 00157 Rome, Italy
| | - Martina Leopizzi
- />Medico-Surgical Sciences and Biotechnology Department, Polo Pontino- Sapienza University of Rome, 04100 Latina, Italy
| | - Valeria Di Maio
- />Medico-Surgical Sciences and Biotechnology Department, Polo Pontino- Sapienza University of Rome, 04100 Latina, Italy
| | - Carlo Della Rocca
- />Medico-Surgical Sciences and Biotechnology Department, Polo Pontino- Sapienza University of Rome, 04100 Latina, Italy
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Litosch I. Regulating G protein activity by lipase-independent functions of phospholipase C. Life Sci 2015; 137:116-24. [DOI: 10.1016/j.lfs.2015.07.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 06/18/2015] [Accepted: 07/22/2015] [Indexed: 11/27/2022]
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Guzmán-Silva A, Vázquez de Lara LG, Torres-Jácome J, Vargaz-Guadarrama A, Flores-Flores M, Pezzat Said E, Lagunas-Martínez A, Mendoza-Milla C, Tanzi F, Moccia F, Berra-Romani R. Lung Beractant Increases Free Cytosolic Levels of Ca2+ in Human Lung Fibroblasts. PLoS One 2015; 10:e0134564. [PMID: 26230503 PMCID: PMC4521834 DOI: 10.1371/journal.pone.0134564] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 07/11/2015] [Indexed: 12/12/2022] Open
Abstract
Beractant, a natural surfactant, induces an antifibrogenic phenotype and apoptosis in normal human lung fibroblasts (NHLF). As intracellular Ca2+ signalling has been related to programmed cell death, we aimed to assess the effect of beractant on intracellular Ca2+ concentration ([Ca2+]i) in NHLF in vitro. Cultured NHLF were loaded with Fura-2 AM (3 μM) and Ca2+ signals were recorded by microfluorimetric techniques. Beractant causes a concentration-dependent increase in [Ca2+]i with a EC50 of 0.82 μg/ml. The application of beractant, at a concentration of 500 μg/ml, which has been shown to exert an apoptotic effect in human fibroblasts, elicited different patterns of Ca2+ signals in NHLF: a) a single Ca2+ spike which could be followed by b) Ca2+ oscillations, c) a sustained Ca2+ plateau or d) a sustained plateau overlapped by Ca2+ oscillations. The amplitude and pattern of Ca2+ transients evoked by beractant were dependent on the resting [Ca2+]i. Pharmacological manipulation revealed that beractant activates a Ca2+ signal through Ca2+ release from intracellular stores mediated by phospholipase Cβ (PLCβ), Ca2+ release from inositol 1,4,5-trisphosphate receptors (IP3Rs) and Ca2+ influx via a store-operated pathway. Moreover, beractant-induced Ca2+ release was abolished by preventing membrane depolarization upon removal of extracellular Na+ and Ca2+. Finally, the inhibition of store-operated channels prevented beractant-induced NHLF apoptosis and downregulation of α1(I) procollagen expression. Therefore, beractant utilizes SOCE to exert its pro-apoptotic and antifibrinogenic effect on NHLF.
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Affiliation(s)
- Alejandro Guzmán-Silva
- Department of Biomedicine, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, Puebla, México
| | - Luis G. Vázquez de Lara
- Experimental Medicine Laboratory, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, Puebla, México
| | - Julián Torres-Jácome
- Physiology Institute, Benemérita Universidad Autónoma de Puebla, Puebla, Puebla, México
| | - Ajelet Vargaz-Guadarrama
- Department of Biomedicine, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, Puebla, México
| | - Marycruz Flores-Flores
- Department of Biomedicine, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, Puebla, México
| | - Elias Pezzat Said
- Experimental Medicine Laboratory, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, Puebla, México
| | - Alfredo Lagunas-Martínez
- Instituto Nacional de Salud Pública, Centro de Investigación sobre Enfermedades Infecciosas, Cuernavaca, Morelos, México
| | - Criselda Mendoza-Milla
- Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, México City, México
| | - Franco Tanzi
- Laboratory of General Physiology, Department of Biology and Biotechnology ‘‘Lazzaro Spallanzani”, University of Pavia, Pavia, Italy
| | - Francesco Moccia
- Laboratory of General Physiology, Department of Biology and Biotechnology ‘‘Lazzaro Spallanzani”, University of Pavia, Pavia, Italy
| | - Roberto Berra-Romani
- Department of Biomedicine, School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, Puebla, México
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Pulli I, Blom T, Löf C, Magnusson M, Rimessi A, Pinton P, Törnquist K. A novel chimeric aequorin fused with caveolin-1 reveals a sphingosine kinase 1-regulated Ca²⁺ microdomain in the caveolar compartment. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:2173-82. [PMID: 25892494 DOI: 10.1016/j.bbamcr.2015.04.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 03/13/2015] [Accepted: 04/07/2015] [Indexed: 11/18/2022]
Abstract
Caveolae are plasma membrane invaginations enriched in sterols and sphingolipids. Sphingosine kinase 1 (SK1) is an oncogenic protein that converts sphingosine to sphingosine 1-phosphate (S1P), which is a messenger molecule involved in calcium signaling. Caveolae contain calcium responsive proteins, but the effects of SK1 or S1P on caveolar calcium signaling have not been investigated. We generated a Caveolin-1-Aequorin fusion protein (Cav1-Aeq) that can be employed for monitoring the local calcium concentration at the caveolae ([Ca²⁺]cav). In HeLa cells, Cav1-Aeq reported different [Ca²⁺] as compared to the plasma membrane [Ca²⁺] in general (reported by SNAP25-Aeq) or as compared to the cytosolic [Ca²⁺] (reported by cyt-Aeq). The Ca²⁺ signals detected by Cav1-Aeq were significantly attenuated when the caveolar structures were disrupted by methyl-β-cyclodextrin, suggesting that the caveolae are specific targets for Ca²⁺ signaling. HeLa cells overexpressing SK1 showed increased [Ca²⁺]cav during histamine-induced Ca²⁺ mobilization in the absence of extracellular Ca²⁺ as well as during receptor-operated Ca²⁺ entry (ROCE). The SK1-induced increase in [Ca²⁺]cav during ROCE was reverted by S1P receptor antagonists. In accordance, pharmacologic inhibition of SK1 reduced the [Ca²⁺]cav during ROCE. S1P treatment stimulated the [Ca²⁺]cav upon ROCE. The Ca²⁺ responses at the plasma membrane in general were not affected by SK1 expression. In summary, our results show that SK1/S1P-signaling regulates Ca²⁺ signals at the caveolae. This article is part of a Special Issue entitled: 13th European Symposium on Calcium.
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Affiliation(s)
- Ilari Pulli
- Åbo Akademi University, Tykistökatu 6A, 20520 Turku, Finland
| | - Tomas Blom
- University Of Helsinki, 00014 Helsinki, Finland
| | - Christoffer Löf
- University Of Turku, Department of Physiology, Institute of Biomedicine, Kiinamyllynkatu 10, 20520 Turku, Finland
| | | | - Alessandro Rimessi
- University of Ferrara, Dept. of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies (LTTA), 44121 Ferrara, Italy
| | - Paolo Pinton
- University of Ferrara, Dept. of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies (LTTA), 44121 Ferrara, Italy
| | - Kid Törnquist
- Åbo Akademi University, Tykistökatu 6A, 20520 Turku, Finland; Minerva Foundation Institute For Medical Research, Biomedicum Helsinki, 00270 Helsinki, Finland.
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Béziau DM, Toussaint F, Blanchette A, Dayeh NR, Charbel C, Tardif JC, Dupuis J, Ledoux J. Expression of phosphoinositide-specific phospholipase C isoforms in native endothelial cells. PLoS One 2015; 10:e0123769. [PMID: 25875657 PMCID: PMC4395365 DOI: 10.1371/journal.pone.0123769] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 02/25/2015] [Indexed: 11/18/2022] Open
Abstract
Phospholipase C (PLC) comprises a superfamily of enzymes that play a key role in a wide array of intracellular signalling pathways, including protein kinase C and intracellular calcium. Thirteen different mammalian PLC isoforms have been identified and classified into 6 families (PLC-β, γ, δ, ε, ζ and η) based on their biochemical properties. Although the expression of PLC isoforms is tissue-specific, concomitant expression of different PLC has been reported, suggesting that PLC family is involved in multiple cellular functions. Despite their critical role, the PLC isoforms expressed in native endothelial cells (ECs) remains undetermined. A conventional PCR approach was initially used to elucidate the mRNA expression pattern of PLC isoforms in 3 distinct murine vascular beds: mesenteric (MA), pulmonary (PA) and middle cerebral arteries (MCA). mRNA encoding for most PLC isoforms was detected in MA, MCA and PA with the exception of η2 and β2 (only expressed in PA), δ4 (only expressed in MCA), η1 (expressed in all but MA) and ζ (not detected in any vascular beds tested). The endothelial-specific PLC expression was then sought in freshly isolated ECs. Interestingly, the PLC expression profile appears to differ across the investigated arterial beds. While mRNA for 8 of the 13 PLC isoforms was detected in ECs from MA, two additional PLC isoforms were detected in ECs from PA and MCA. Co-expression of multiple PLC isoforms in ECs suggests an elaborate network of signalling pathways: PLC isoforms may contribute to the complexity or diversity of signalling by their selective localization in cellular microdomains. However in situ immunofluorescence revealed a homogeneous distribution for all PLC isoforms probed (β3, γ2 and δ1) in intact endothelium. Although PLC isoforms play a crucial role in endothelial signal transduction, subcellular localization alone does not appear to be sufficient to determine the role of PLC in the signalling microdomains found in the native endothelium.
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Affiliation(s)
- Delphine M. Béziau
- Research Center, Montreal Heart Institute, Montreal, Qc, Canada
- Department of Molecular and Integrative Physiology, Université de Montréal, Montreal, Qc, Canada
| | - Fanny Toussaint
- Research Center, Montreal Heart Institute, Montreal, Qc, Canada
- Department of Molecular and Integrative Physiology, Université de Montréal, Montreal, Qc, Canada
| | | | - Nour R. Dayeh
- Research Center, Montreal Heart Institute, Montreal, Qc, Canada
- Department of Medicine, Université de Montréal, Montreal, Qc, Canada
| | - Chimène Charbel
- Research Center, Montreal Heart Institute, Montreal, Qc, Canada
- Department of Pharmacology, Université de Montréal, Montreal, Qc, Canada
| | - Jean-Claude Tardif
- Research Center, Montreal Heart Institute, Montreal, Qc, Canada
- Department of Medicine, Université de Montréal, Montreal, Qc, Canada
| | - Jocelyn Dupuis
- Research Center, Montreal Heart Institute, Montreal, Qc, Canada
- Department of Medicine, Université de Montréal, Montreal, Qc, Canada
| | - Jonathan Ledoux
- Research Center, Montreal Heart Institute, Montreal, Qc, Canada
- Department of Molecular and Integrative Physiology, Université de Montréal, Montreal, Qc, Canada
- Department of Pharmacology, Université de Montréal, Montreal, Qc, Canada
- Department of Medicine, Université de Montréal, Montreal, Qc, Canada
- * E-mail:
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