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Wang H, Wei Y, Wang N. Purinergic pathways and their clinical use in the treatment of acute myeloid leukemia. Purinergic Signal 2024:10.1007/s11302-024-09997-8. [PMID: 38446337 DOI: 10.1007/s11302-024-09997-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 02/21/2024] [Indexed: 03/07/2024] Open
Abstract
Despite the use of various therapies such as hematopoietic stem cell transplantation and chimeric antigen receptor T cell therapy (CAR-T), the prognosis of patients with acute myeloid leukemia (AML) is still generally poor. However, immunotherapy is currently a hot topic in the treatment of hematological tumors. Extracellular adenosine triphosphate (ATP) can be converted to adenosine diphosphate (ADP) via CD39, and ADP can be converted to adenosine via CD73, which can bind to P1 and P2 receptors to exert immunomodulatory effects. Research on the mechanism of the purinergic signaling pathway can provide a new direction for the treatment of AML, and inhibitors of this signaling pathway have been discovered by several researchers and gradually applied in the clinic. In this paper, the mechanism of the purinergic signaling pathway and its clinical application are described, revealing a new target for the treatment of AML and subsequent improvement in patient prognosis.
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Affiliation(s)
- Huijuan Wang
- Department of Hematology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Yujie Wei
- Department of Hematology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Na Wang
- Department of Hematology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China.
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2
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Zaib S, Areeba, Khan I. Purinergic Signaling and its Role in the Stem Cell Differentiation. Mini Rev Med Chem 2024; 24:863-883. [PMID: 37828668 DOI: 10.2174/0113895575261206231003151416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Revised: 07/30/2023] [Accepted: 08/30/2023] [Indexed: 10/14/2023]
Abstract
Purinergic signaling is a mechanism in which extracellular purines and pyrimidines interact with specialized cell surface receptors known as purinergic receptors. These receptors are divided into two families of P1 and P2 receptors, each responding to different nucleosides and nucleotides. P1 receptors are activated by adenosine, while P2 receptors are activated by pyrimidine and purines. P2X receptors are ligand-gated ion channels, including seven subunits (P2X1-7). However, P2Y receptors are the G-protein coupled receptors comprising eight subtypes (P2Y1/2/4/6/11/12/13/14). The disorder in purinergic signaling leads to various health-related issues and diseases. In various aspects, it influences the activity of non-neuronal cells and neurons. The molecular mechanism of purinergic signaling provides insight into treating various human diseases. On the contrary, stem cells have been investigated for therapeutic applications. Purinergic signaling has shown promising effect in stem cell engraftment. The immune system promotes the autocrine and paracrine mechanisms and releases the significant factors essential for successful stem cell therapy. Each subtype of purinergic receptor exerts a beneficial effect on the damaged tissue. The most common effect caused by purinergic signaling is the proliferation and differentiation that treat different health-related conditions.
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Affiliation(s)
- Sumera Zaib
- Department of Basic and Applied Chemistry, Faculty of Science and Technology, University of Central Punjab, Lahore, 54590, Pakistan
| | - Areeba
- Department of Basic and Applied Chemistry, Faculty of Science and Technology, University of Central Punjab, Lahore, 54590, Pakistan
| | - Imtiaz Khan
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, United Kingdom
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3
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Andrejew R, Glaser T, Oliveira-Giacomelli Á, Ribeiro D, Godoy M, Granato A, Ulrich H. Targeting Purinergic Signaling and Cell Therapy in Cardiovascular and Neurodegenerative Diseases. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1201:275-353. [PMID: 31898792 DOI: 10.1007/978-3-030-31206-0_14] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Extracellular purines exert several functions in physiological and pathophysiological mechanisms. ATP acts through P2 receptors as a neurotransmitter and neuromodulator and modulates heart contractility, while adenosine participates in neurotransmission, blood pressure, and many other mechanisms. Because of their capability to differentiate into mature cell types, they provide a unique therapeutic strategy for regenerating damaged tissue, such as in cardiovascular and neurodegenerative diseases. Purinergic signaling is pivotal for controlling stem cell differentiation and phenotype determination. Proliferation, differentiation, and apoptosis of stem cells of various origins are regulated by purinergic receptors. In this chapter, we selected neurodegenerative and cardiovascular diseases with clinical trials using cell therapy and purinergic receptor targeting. We discuss these approaches as therapeutic alternatives to neurodegenerative and cardiovascular diseases. For instance, promising results were demonstrated in the utilization of mesenchymal stem cells and bone marrow mononuclear cells in vascular regeneration. Regarding neurodegenerative diseases, in general, P2X7 and A2A receptors mostly worsen the degenerative state. Stem cell-based therapy, mainly through mesenchymal and hematopoietic stem cells, showed promising results in improving symptoms caused by neurodegeneration. We propose that purinergic receptor activity regulation combined with stem cells could enhance proliferative and differentiation rates as well as cell engraftment.
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Affiliation(s)
- Roberta Andrejew
- Neuroscience Laboratory, Institute of Chemistry, Department of Biochemistry, University of São Paulo, São Paulo, Brazil
| | - Talita Glaser
- Neuroscience Laboratory, Institute of Chemistry, Department of Biochemistry, University of São Paulo, São Paulo, Brazil
| | - Ágatha Oliveira-Giacomelli
- Neuroscience Laboratory, Institute of Chemistry, Department of Biochemistry, University of São Paulo, São Paulo, Brazil
| | - Deidiane Ribeiro
- Neuroscience Laboratory, Institute of Chemistry, Department of Biochemistry, University of São Paulo, São Paulo, Brazil
| | - Mariana Godoy
- Neuroscience Laboratory, Institute of Chemistry, Department of Biochemistry, University of São Paulo, São Paulo, Brazil.,Laboratory of Neurodegenerative Diseases, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Alessandro Granato
- Neuroscience Laboratory, Institute of Chemistry, Department of Biochemistry, University of São Paulo, São Paulo, Brazil
| | - Henning Ulrich
- Neuroscience Laboratory, Institute of Chemistry, Department of Biochemistry, University of São Paulo, São Paulo, Brazil.
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4
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Vemulapalli H, Albayati S, Patwa VC, Tilley DG, Tsygankov AY, Liverani E. ADP exerts P2Y 12 -dependent and P2Y 12 -independent effects on primary human T cell responses to stimulation. J Cell Commun Signal 2019; 14:111-126. [PMID: 31808055 DOI: 10.1007/s12079-019-00540-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 11/25/2019] [Indexed: 01/11/2023] Open
Abstract
Purinergic signaling plays a complex role in inflammation. Nucleotides released by T lymphocytes, endothelial cells, and platelets during inflammation induce cellular responses by binding to receptors that regulate intracellular signaling pathways. Previous studies have found that purinergic signaling can have both proinflammatory and anti-inflammatory effects, but the roles of specific pathways in specific cell types are poorly understood. We investigated the role of the P2Y12 signaling pathway in the activation of T lymphocytes in vitro. We isolated peripheral blood mononuclear cells (PBMCs) from healthy donors and pretreated them with ADP (a P2Y12 agonist), AR-C69931MX (a P2Y12 antagonist), or both. We then stimulated PBMC using phytohemagglutinin (PHA) or anti-CD3/CD28 antibodies. We found that ADP affects T cell responses in term of cell activity and receptor expression through both P2Y12-dependent and P2Y12-independent pathways and other responses (cytokine secretion) primarily through P2Y12 -independent pathways. The ADP-mediated effect changed over time and was stimulus-specific.
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Affiliation(s)
- Harika Vemulapalli
- Sol Sherry Thrombosis Research Center, Lewis Katz School of Medicine at Temple University, 3420 North Broad Street, Philadelphia, PA, 19140, USA
| | - Samara Albayati
- Sol Sherry Thrombosis Research Center, Lewis Katz School of Medicine at Temple University, 3420 North Broad Street, Philadelphia, PA, 19140, USA
| | - Viren C Patwa
- Center for Translational Medicine, Lewis Katz School of Medicine, Temple University, 3500 North Broad Street, Philadelphia, PA, USA
| | - Douglas G Tilley
- Center for Translational Medicine, Lewis Katz School of Medicine, Temple University, 3500 North Broad Street, Philadelphia, PA, USA
| | - Alexander Y Tsygankov
- Sol Sherry Thrombosis Research Center, Lewis Katz School of Medicine at Temple University, 3420 North Broad Street, Philadelphia, PA, 19140, USA.,Department of Microbiology and Immunology, Temple University School of Medicine, Temple University Hospital, Philadelphia, PA, USA
| | - Elisabetta Liverani
- Sol Sherry Thrombosis Research Center, Lewis Katz School of Medicine at Temple University, 3420 North Broad Street, Philadelphia, PA, 19140, USA.
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Nassir M, Arad U, Lee SY, Journo S, Mirza S, Renn C, Zimmermann H, Pelletier J, Sévigny J, Müller CE, Fischer B. Identification of adenine-N9-(methoxy)ethyl-β-bisphosphonate as NPP1 inhibitor attenuates NPPase activity in human osteoarthritic chondrocytes. Purinergic Signal 2019; 15:247-263. [PMID: 31025169 DOI: 10.1007/s11302-019-09649-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 02/06/2019] [Indexed: 12/17/2022] Open
Abstract
Overproduction of extracellular diphosphate due to hydrolysis of ATP by NPP1 leads to pathological calcium diphosphate (pyrophosphate) dihydrate deposition (CPPD) in cartilage, resulting in a degenerative joint disease that today lacks a cure. Here, we targeted the identification of novel NPP1 inhibitors as potential therapeutic agents for CPPD deposition disease. Specifically, we synthesized novel analogs of AMP (NPP1 reaction product) and ADP (NPP1 inhibitor). These derivatives incorporate several chemical modifications of the natural nucleotides including (1) a methylene group replacing the Pα,β-bridging oxygen atom to provide metabolic resistance, (2) sulfonate group(s) replacing phosphonate(s) to improve binding to NPP1's catalytic zinc ions, (3) an acyclic nucleotide analog to allow flexible binding in the NPP1 catalytic site, and (4) a benzimidazole base replacing adenine. Among the investigated compounds, adenine-N9-(methoxy)ethyl-β-bisphosphonate, 10, was identified as an NPP1 inhibitor (Ki 16.3 μM vs. the artificial substrate p-nitrophenyl thymidine-5'-monophosphate (p-Nph-5'-TMP), and 9.60 μM vs. the natural substrate, ATP). Compound 10 was selective for NPP1 vs. human NPP3, human CD39, and tissue non-specific alkaline phosphatase (TNAP), but also inhibited human CD73 (Ki 12.6 μM). Thus, 10 is a dual NPP1/CD73 inhibitor, which could not only be of interest for treating CPPD deposition disease and calcific aortic valve disease but may also be considered for the immunotherapy of cancer. Compound 10 proved to be a promising inhibitor, which almost completely reduces NPPase activity in human osteoarthritic chondrocytes at a concentration of 100 μM.
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Affiliation(s)
- Molhm Nassir
- Department of Chemistry, Bar-Ilan University, 52900, Ramat-Gan, Israel
| | - Uri Arad
- Department of Rheumatology, Tel Aviv Medical Center and the Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Sang-Yong Lee
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, Bonn, Germany
| | - Shani Journo
- Department of Rheumatology, Tel Aviv Medical Center and the Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Salahuddin Mirza
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, Bonn, Germany
| | - Christian Renn
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, Bonn, Germany
| | - Herbert Zimmermann
- Institute of Cell Biology and Neuroscience, Goethe-University, 60438, Frankfurt am Main, Germany
| | - Julie Pelletier
- Centre de Recherche du CHU de Québec - Université Laval, Québec City, QC, Canada
| | - Jean Sévigny
- Centre de Recherche du CHU de Québec - Université Laval, Québec City, QC, Canada.,Département de Microbiologie-Infectiologie et d'Immunologie, Faculté de Médecine, Université Laval, Québec City, QC, Canada
| | - Christa E Müller
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, Bonn, Germany
| | - Bilha Fischer
- Department of Chemistry, Bar-Ilan University, 52900, Ramat-Gan, Israel.
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High Level P2X7-Mediated Signaling Impairs Function of Hematopoietic Stem/Progenitor Cells. Stem Cell Rev Rep 2017; 12:305-14. [PMID: 27059869 DOI: 10.1007/s12015-016-9651-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Nucleotides, which bind to P2 receptors, have emerged as a family of mediators in intercellular communication. P2X7 is a member of the P2X family ligand-gated ion channels respond to extracellular ATP. High level expression of P2X7 was detected in leukemia samples, especially in relapsed cases. However, the role of P2X7 mediated signaling in hematopoietic stem/progenitor cells (HSPCs) as well as its potential role in leukemogenesis have not been established. In this study, the expression of P2X7 in hematopoietic cells in different lineages and stages was analyzed. Over-expression of P2X7 in HSPCs was carried out by retrovirus infection to study the impact on HSPCs. The results showed that low level expression of P2X7 was detected in HSPCs. Over-expression of P2X7 in HSPCs resulted in decreased colony forming ability in vitro and engraftment potential in vivo. These results suggested that high level purinergic signaling by P2X7 impaired function of HSPCs.
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Zahoor I, de Koning DJ, Hocking PM. Transcriptional profile of breast muscle in heat stressed layers is similar to that of broiler chickens at control temperature. Genet Sel Evol 2017; 49:69. [PMID: 28931372 PMCID: PMC5607596 DOI: 10.1186/s12711-017-0346-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 08/31/2017] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND In recent years, the commercial importance of changes in muscle function of broiler chickens and of the corresponding effects on meat quality has increased. Furthermore, broilers are more sensitive to heat stress during transport and at high ambient temperatures than smaller egg-laying chickens. We hypothesised that heat stress would amplify muscle damage and expression of genes that are involved in such changes and, thus, lead to the identification of pathways and networks associated with broiler muscle and meat quality traits. Broiler and layer chickens were exposed to control or high ambient temperatures to characterise differences in gene expression between the two genotypes and the two environments. RESULTS Whole-genome expression studies in breast muscles of broiler and layer chickens were conducted before and after heat stress; 2213 differentially-expressed genes were detected based on a significant (P < 0.05) genotype × treatment interaction. This gene set was analysed with the BioLayout Express3D and Ingenuity Pathway Analysis software and relevant biological pathways and networks were identified. Genes involved in functions related to inflammatory reactions, cell death, oxidative stress and tissue damage were upregulated in control broilers compared with control and heat-stressed layers. Expression of these genes was further increased in heat-stressed broilers. CONCLUSIONS Differences in gene expression between broiler and layer chickens under control and heat stress conditions suggest that damage of breast muscles in broilers at normal ambient temperatures is similar to that in heat-stressed layers and is amplified when broilers are exposed to heat stress. The patterns of gene expression of the two genotypes under heat stress were almost the polar opposite of each other, which is consistent with the conclusion that broiler chickens were not able to cope with heat stress by dissipating their body heat. The differentially expressed gene networks and pathways were consistent with the pathological changes that are observed in the breast muscle of heat-stressed broilers.
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Affiliation(s)
- Imran Zahoor
- Division of Genetics and Genomics, Roslin Institute and R(D)SVS, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK.,Department of Animal Breeding and Genetics, University of Veterinary and Animal Sciences, Lahore, 54000, Pakistan
| | - Dirk-Jan de Koning
- Division of Genetics and Genomics, Roslin Institute and R(D)SVS, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK.,Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, 750 07, Uppsala, Sweden
| | - Paul M Hocking
- Division of Genetics and Genomics, Roslin Institute and R(D)SVS, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK.
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8
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Elias HK, Bryder D, Park CY. Molecular mechanisms underlying lineage bias in aging hematopoiesis. Semin Hematol 2017; 54:4-11. [DOI: 10.1053/j.seminhematol.2016.11.002] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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9
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Abstract
Background: The nucleotide adenosine triphosphate (ATP) has long been known to drive and participate in countless intracellular processes. Extracellular ATP and its metabolite adenosine have also been shown to exert a variety of effects on nearly every cell type in human skin. Knowledge of the sources and effects of extracellular ATP in human skin may help shape new therapies for skin injury, inflammation, and numerous other cutaneous disorders. Objective: The objective of this review is to introduce the reader to current knowledge regarding the sources and effects of extracellular ATP in human skin and to outline areas in which further research is necessary to clarify the nature and mechanism of these effects. Conclusion: Extracellular ATP seems to play a direct role in triggering skin inflammatory, regenerative, and fibrotic responses to mechanical injury, an indirect role in melanocyte proliferation and apoptosis, and a complex role in Langerhans cell-directed adaptive immunity.
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Affiliation(s)
| | - Richard D. Granstein
- Department of Dermatology, Joan and Sanford I. Weill Medical College of Cornell University, New York, New York, USA
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10
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Feng W, Wang L, Zheng G. Expression and function of P2 receptors in hematopoietic stem and progenitor cells. Stem Cell Investig 2015; 2:14. [PMID: 27358882 DOI: 10.3978/j.issn.2306-9759.2015.07.01] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 05/28/2015] [Indexed: 12/15/2022]
Abstract
Nucleotides have unambiguously emerged as a family of mediators of intercellular communication, which bind to a class of plasma membrane receptors, P2 receptors, to trigger intercellular signaling. P2 receptors can be further divided into P2X and P2Y subfamilies based on structure and function. Different hematopoietic cells express diverse spectrums of P2 receptors at different levels, including hematopoietic stem and progenitor cells (HSPCs). Extracellular adenosine triphosphate (ATP) exerts different effects on HSPCs, regulating cell proliferation, differentiation, migration, and chemotaxis, release of cytokines or lysosomal constituents, and generation of reactive oxygen or nitrogen species. The relationship between abnormal P2 receptor function and human diseases attracts more and more attention. This review summarizes the expression and function of P2 receptors in HSPCs and the relationship to hematopoietic diseases.
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Affiliation(s)
- Wenli Feng
- 1 State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Disease Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300020, China ; 2 Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing 100730, China
| | - Lina Wang
- 1 State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Disease Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300020, China ; 2 Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing 100730, China
| | - Guoguang Zheng
- 1 State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Disease Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300020, China ; 2 Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing 100730, China
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11
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Iser IC, Bracco PA, Gonçalves CEI, Zanin RF, Nardi NB, Lenz G, Battastini AMO, Wink MR. Mesenchymal stem cells from different murine tissues have differential capacity to metabolize extracellular nucleotides. J Cell Biochem 2015; 115:1673-82. [PMID: 24802095 DOI: 10.1002/jcb.24830] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Revised: 03/29/2014] [Accepted: 05/02/2014] [Indexed: 12/12/2022]
Abstract
Mesenchymal stem cells (MSCs) have shown a great potential for cell-based therapy and many different therapeutic purposes. Despite the recent advances in the knowledge of MSCs biology, their biochemical and molecular properties are still poorly defined. Ecto-nucleoside triphosphate diphosphohydrolases (E-NTPDases) and ecto-5'-nucleotidase (eNT/CD73) are widely expressed enzymes that hydrolyze extracellular nucleotides, generating an important cellular signaling cascade. Currently, studies have evidenced the relationship between the purinergic system and the development, maintenance, and differentiation of stem cells. The objective of this study is to identify the NTPDases and eNT/CD73 and compare the levels of nucleotide hydrolysis on MSCs isolated from different murine tissues (bone marrow, lung, vena cava, kidney, pancreas, spleen, skin, and adipose tissue). MSCs from all tissues investigated expressed the ectoenzymes at different levels. In MSCs from pancreas and adipose tissue, the hydrolysis of triphosphonucleosides was significantly higher when compared to the other cells. The diphosphonucleosides were hydrolyzed at a higher rate by MSC from pancreas when compared to MSC from other tissues. The differential nucleotide hydrolysis activity and enzyme expression in these cells suggests that MSCs play different roles in regulating the purinergic system in these tissues. Overall MSCs are an attractive adult-derived cell population for therapies, however, the fact that ecto-nucleotide metabolism can affect the microenvironment, modulating important events, such as immune response, makes the assessment of this metabolism an important part of the characterization of MSCs to be applied therapeutically.
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Affiliation(s)
- Isabele C Iser
- Departamento de Ciências Básicas da Saúde e Laboratório de Biologia Celular, Universidade Federal de Ciências da Saúde de Porto Alegre-UFCSPA, Porto Alegre, RS, Brazil
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12
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Cho J, Yusuf R, Kook S, Attar E, Lee D, Park B, Cheng T, Scadden DT, Lee BC. Purinergic P2Y₁₄ receptor modulates stress-induced hematopoietic stem/progenitor cell senescence. J Clin Invest 2014; 124:3159-71. [PMID: 24937426 DOI: 10.1172/jci61636] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 04/29/2014] [Indexed: 11/17/2022] Open
Abstract
Purinergic receptors of the P2Y family are G protein-coupled surface receptors that respond to extracellular nucleotides and can mediate responses to local cell damage. P2Y-dependent signaling contributes to thrombotic and/or inflammatory consequences of tissue injury by altering platelet and endothelial activation and immune cell phagocytosis. Here, we have demonstrated that P2Y14 modifies cell senescence and cell death in response to tissue stress, thereby enabling preservation of hematopoietic stem/progenitor cell function. In mice, P2Y14 deficiency had no demonstrable effect under homeostatic conditions; however, radiation stress, aging, sequential exposure to chemotherapy, and serial bone marrow transplantation increased senescence in animals lacking P2Y14. Enhanced senescence coincided with increased ROS, elevated p16(INK4a) expression, and hypophosphorylated Rb and was inhibited by treatment with a ROS scavenger or inhibition of p38/MAPK and JNK. Treatment of WT cells with pertussis toxin recapitulated the P2Y14 phenotype, suggesting that P2Y14 mediates antisenescence effects through Gi/o protein-dependent pathways. Primitive hematopoietic cells lacking P2Y14 were compromised in their ability to restore hematopoiesis in irradiated mice. Together, these data indicate that P2Y14 on stem/progenitor cells of the hematopoietic system inhibits cell senescence by monitoring and responding to the extracellular manifestations of tissue stress and suggest that P2Y14-mediated responses prevent the premature decline of regenerative capacity after injury.
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Jacob F, Novo CP, Bachert C, Van Crombruggen K. Purinergic signaling in inflammatory cells: P2 receptor expression, functional effects, and modulation of inflammatory responses. Purinergic Signal 2013; 9:285-306. [PMID: 23404828 PMCID: PMC3757148 DOI: 10.1007/s11302-013-9357-4] [Citation(s) in RCA: 169] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Accepted: 01/28/2013] [Indexed: 01/13/2023] Open
Abstract
Extracellular ATP and related nucleotides promote a wide range of pathophysiological responses via activation of cell surface purinergic P2 receptors. Almost every cell type expresses P2 receptors and/or exhibit regulated release of ATP. In this review, we focus on the purinergic receptor distribution in inflammatory cells and their implication in diverse immune responses by providing an overview of the current knowledge in the literature related to purinergic signaling in neutrophils, macrophages, dendritic cells, lymphocytes, eosinophils, and mast cells. The pathophysiological role of purinergic signaling in these cells include among others calcium mobilization, actin polymerization, chemotaxis, release of mediators, cell maturation, cytotoxicity, and cell death. We finally discuss the therapeutic potential of P2 receptor subtype selective drugs in inflammatory conditions.
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Affiliation(s)
- Fenila Jacob
- Upper Airways Research Laboratory, Department of Otorhinolaryngology, Ghent University Hospital, De Pintelaan 185, 9000 Ghent, Belgium
| | - Claudina Pérez Novo
- Upper Airways Research Laboratory, Department of Otorhinolaryngology, Ghent University Hospital, De Pintelaan 185, 9000 Ghent, Belgium
| | - Claus Bachert
- Upper Airways Research Laboratory, Department of Otorhinolaryngology, Ghent University Hospital, De Pintelaan 185, 9000 Ghent, Belgium
| | - Koen Van Crombruggen
- Upper Airways Research Laboratory, Department of Otorhinolaryngology, Ghent University Hospital, De Pintelaan 185, 9000 Ghent, Belgium
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14
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Kook S, Cho J, Lee SB, Lee BC. The nucleotide sugar UDP-glucose mobilizes long-term repopulating primitive hematopoietic cells. J Clin Invest 2013; 123:3420-35. [PMID: 23863713 DOI: 10.1172/jci64060] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Accepted: 05/16/2013] [Indexed: 12/29/2022] Open
Abstract
Hematopoietic stem progenitor cells (HSPCs) are present in very small numbers in the circulating blood in steady-state conditions. In response to stress or injury, HSPCs are primed to migrate out of their niche to peripheral blood. Mobilized HSPCs are now commonly used as stem cell sources due to faster engraftment and reduced risk of posttransplant infection. In this study, we demonstrated that a nucleotide sugar, UDP-glucose, which is released into extracellular fluids in response to stress, mediates HSPC mobilization. UDP-glucose-mobilized cells possessed the capacity to achieve long-term repopulation in lethally irradiated animals and the ability to differentiate into multi-lineage blood cells. Compared with G-CSF-mobilized cells, UDP-glucose-mobilized cells preferentially supported long-term repopulation and exhibited lymphoid-biased differentiation, suggesting that UDP-glucose triggers the mobilization of functionally distinct subsets of HSPCs. Furthermore, co-administration of UDP-glucose and G-CSF led to greater HSPC mobilization than G-CSF alone. Administration of the antioxidant agent NAC significantly reduced UDP-glucose-induced mobilization, coinciding with a reduction in RANKL and osteoclastogenesis. These findings provide direct evidence demonstrating a potential role for UDP-glucose in HSPC mobilization and may provide an attractive strategy to improve the yield of stem cells in poor-mobilizing allogeneic or autologous donors.
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Affiliation(s)
- Sungho Kook
- University of Pittsburgh Cancer Institute and Department of Medicine, Division of Hematology and Oncology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, USA
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15
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Christersson C, Johnell M, Siegbahn A. Evaluation of microparticles in whole blood by multicolour flow cytometry assay. Scandinavian Journal of Clinical and Laboratory Investigation 2013; 73:229-39. [PMID: 23452203 DOI: 10.3109/00365513.2013.769278] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVE To develop and evaluate a multicolour flow cytometry method for analysis of microparticles (MPs) in fresh whole blood without any centrifugation steps or freezing/thawing procedure. MATERIALS AND METHODS Flow cytometry was performed using a FC500 MPL cytometer. The compensation in the protocol was performed based on the platelet population. Polystyrene microspheres 0.50-1.27 μm were used for size position, and the MP gate was set as particles 0.5-1.0 μm. Whole blood was incubated with annexin V and antibodies to tissue factor (TF), platelets (CD41 and CD62P), monocyte (CD14) and endothelial cells (CD144). For comparison, MPs from platelet free supernatant was used. The TF activity was evaluated by Calibrated Automated Thrombogram. RESULTS Annexin V was used to distinguish true events from background noise. For standardization, each analysis included 10,000 events in the gate of platelets. There were 622(462-1001) MP(annV+)/10,000 platelets and of these, 66 (49-82)/10,000 platelets expressed TF. After correction for the individual platelet counts, the amount of circulating MP(annV+) was 17.1 (12.1-24.9) × 10(9)/L in whole blood, and of these, 10% (6-12%) expressed TF. The majority of the MPs expressed CD41, and 5.6% (2.2-6.9%) of these co-expressed TF. The amount of CD41 + MP(annV+) tended to correlate to the TF activity in whole blood. There was no correlation between the MP(annV+) in whole blood and MPs derived from platelet free supernatant. Patients with pulmonary arterial hypertension and stable coronary artery disease had increased concentrations of CD41 + MP(annV+) in whole blood. CONCLUSION This multicolour flow cytometry assay in whole blood mimics the in vivo situation by avoiding several procedure steps interfering with the MP count. By standardized quantification of MPs a reference interval of MPs can be created.
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Ciciarello M, Zini R, Rossi L, Salvestrini V, Ferrari D, Manfredini R, Lemoli RM. Extracellular purines promote the differentiation of human bone marrow-derived mesenchymal stem cells to the osteogenic and adipogenic lineages. Stem Cells Dev 2012; 22:1097-111. [PMID: 23259837 DOI: 10.1089/scd.2012.0432] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Extracellular nucleotides are potent signaling molecules mediating cell-specific biological functions, mostly within the processes of tissue damage and repair and flogosis. We previously demonstrated that adenosine 5'-triphosphate (ATP) inhibits the proliferation of human bone marrow-derived mesenchymal stem cells (BM-hMSCs), while stimulating, in vitro and in vivo, their migration. Here, we investigated the effects of ATP on BM-hMSC differentiation capacity. Molecular analysis showed that ATP treatment modulated the expression of several genes governing adipogenic and osteoblastic (i.e., WNT-pathway-related genes) differentiation of MSCs. Functional studies demonstrated that ATP, under specific culture conditions, stimulated adipogenesis by significantly increasing the lipid accumulation and the expression levels of the adipogenic master gene PPARγ (peroxisome proliferator-activated receptor-gamma). In addition, ATP stimulated osteogenic differentiation by promoting mineralization and expression of the osteoblast-related gene RUNX2 (runt-related transcription factor 2). Furthermore, we demonstrated that ATP stimulated adipogenesis via its triphosphate form, while osteogenic differentiation was induced by the nucleoside adenosine, resulting from ATP degradation induced by CD39 and CD73 ectonucleotidases expressed on the MSC membrane. The pharmacological profile of P2 purinergic receptors (P2Rs) suggests that adipogenic differentiation is mainly mediated by the engagement of P2Y1 and P2Y4 receptors, while stimulation of the P1R adenosine-specific subtype A2B is involved in adenosine-induced osteogenic differentiation. Thus, we provide new insights into molecular regulation of MSC differentiation.
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Affiliation(s)
- Marilena Ciciarello
- Department of Hematology and Oncological Sciences, L. & A. Seràgnoli, Institute of Hematology, Stem Cell Research Center, Azienda Ospedaliero-Universitaria Policlinico S. Orsola-Malpighi, University of Bologna, Bologna, Italy.
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Gpr171, a putative P2Y-like receptor, negatively regulates myeloid differentiation in murine hematopoietic progenitors. Exp Hematol 2012; 41:102-12. [PMID: 23022127 DOI: 10.1016/j.exphem.2012.09.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Revised: 08/29/2012] [Accepted: 09/10/2012] [Indexed: 11/23/2022]
Abstract
Gpr171 is an orphan G-protein-coupled receptor putatively related to the P2Y family of purinergic receptors (P2YRs) for extracellular nucleotides, a group of mediators previously shown to regulate hematopoietic progenitor cells. No information is currently available on the ligand responsible for Gpr171 activation and its biological role remains unknown. We reconstructed Gpr171 phylogenesis in mice and confirmed that Gpr171 is evolutionally related to members of a P2Y gene-cluster localized on mouse chromosome 3. As a first step toward unveiling a role for Gpr171, we investigated its expression profile in murine hematopoietic cells. As opposed to other P2YRs, we found that Gpr171 expression is down-regulated in monocytes and granulocytes, suggesting a negative role in myeloid lineage specification. To test Gpr171 functional role, we next enforced Gpr171 expression in a myeloblastic cell line (32D cells) and in primary Sca-1(+) hematopoietic progenitors, and observed a decreased expression of myeloid markers upon induction of Gpr171, as well as an increased generation of colonies in vitro. Conversely, Gpr171 silencing induced opposite results, diminishing the expression of myeloid markers and the clonogenic potential of 32D cells. In vivo, mice transplanted with hematopoietic progenitor cells overexpressing Gpr171 displayed a significant reduction in the percentage of Mac-1(+)Gr-1(-) cells. As a preliminary step in the investigation of Gpr171 role in murine hematopoiesis, our findings indicate that the orphan receptor Gpr171 negatively regulates myeloid differentiation. Together with phylogenic analyses, our data suggest that Gpr171 may have followed a separate evolutionary pathway as compared to other P2YRs belonging to the same gene cluster.
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Abstract
Over the past decade, extracellular nucleotides (such as ATP and UTP) have emerged as key immunomodulators. This family of molecules, already known for its key metabolic functions, has been the focus of intense investigation that has unambiguously shown its crucial role as mediators of cell-to-cell communication. More recently, in addition to its involvement in inflammation and immunity, purinergic signaling has also been shown to modulate BM-derived stem cells. Extracellular nucleotides promote proliferation, CXCL12-driven migration, and BM engraftment of hematopoietic progenitor and stem cells. In addition, purinergic signaling acts indirectly on hematopoietic progenitor and stem cells by regulating differentiation and release of proinflammatory cytokines in BM-derived human mesenchymal stromal cells, which are part of the hematopoietic stem cell (HSC) niche. HSC research has recently blended into the field of immunology, as new findings highlighted the role played by immunologic signals (such as IFN-α, IFN-γ, or TNF-α) in the regulation of the HSC compartment. In this review, we summarize recent reports unveiling a previously unsuspected ability of HSCs to integrate inflammatory signals released by immune and stromal cells, with particular emphasis on the dual role of extracellular nucleotides as mediators of both immunologic responses and BM stem cell functions.
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Kudo F, Nishiguchi N, Mizuike R, Sato H, Ito K, Nakano M, Ito K. Neutrophil phagocytosis is down-regulated by nucleotides until encounter with pathogens. Immunol Lett 2012; 144:24-32. [PMID: 22445356 DOI: 10.1016/j.imlet.2012.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Revised: 02/29/2012] [Accepted: 03/04/2012] [Indexed: 02/06/2023]
Abstract
Extracellular nucleotides such as ATP, ADP, UTP, UDP and UDPG can trigger intracellular signal transduction via purinergic (P2Y) receptors, and their interaction induces a wide range of biological effects in various cells. In this study, we investigated P2Y expression and the effects of nucleotides on chemotaxis and phagocytosis in human neutrophils. RT-PCR detected broad expression of P2Y subfamilies in neutrophils, as well as monocytes. Moreover, intracellular Ca(2+) increased in response to ATP, ADP, UTP and UDP in these cells, suggesting that P2Y receptors were functionally expressed. In neutrophils, chemotactic activity was increased significantly in response to ATP and ADP, and moderately in response to UTP and UDP; actin polymerization by ATP, ADP, UTP and UDP was also evident in the cells. Interestingly, we found that ATP and ADP, which enhanced chemotaxis activity significantly, had inhibitory effects on phagocytosis by neutrophils. These findings provide new evidence for the regulation of neutrophil phagocytosis by nucleotides. Furthermore, this inhibitory effect was completely lost upon co-culture with fMLP or LPS, known constituents of bacteria, resulting in recovery of normal phagocytic activity. Taken together, these findings suggest that ATP and ADP constantly stimulate the chemotactic activity of neutrophils in peripheral blood, but may inhibit their phagocytic activity until they encounter pathogens, in order to prevent them acting against self-tissues or cells, as fMLP and LPS commonly present in pathogens would again trigger normal phagocytic activity.
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Affiliation(s)
- Fujimi Kudo
- Department of Biomedical Sciences, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori, Japan
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20
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Glaser T, Cappellari AR, Pillat MM, Iser IC, Wink MR, Battastini AMO, Ulrich H. Perspectives of purinergic signaling in stem cell differentiation and tissue regeneration. Purinergic Signal 2011; 8:523-37. [PMID: 22143354 DOI: 10.1007/s11302-011-9282-3] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Accepted: 11/09/2011] [Indexed: 12/20/2022] Open
Abstract
Replacement of lost or dysfunctional tissues by stem cells has recently raised many investigations on therapeutic applications. Purinergic signaling has been shown to regulate proliferation, differentiation, cell death, and successful engraftment of stem cells originated from diverse origins. Adenosine triphosphate release occurs in a controlled way by exocytosis, transporters, and lysosomes or in large amounts from damaged cells, which is then subsequently degraded into adenosine. Paracrine and autocrine mechanisms induced by immune responses present critical factors for the success of stem cell therapy. While P1 receptors generally exert beneficial effects including anti-inflammatory activity, P2 receptor-mediated actions depend on the subtype of stimulated receptors and localization of tissue repair. Pro-inflammatory actions and excitatory tissue damages mainly result from P2X7 receptor activation, while other purinergic receptor subtypes participate in proliferation and differentiation, thereby providing adequate niches for stem cell engraftment and novel mechanisms for cell therapy and endogenous tissue repair. Therapeutic applications based on regulation of purinergic signaling are foreseen for kidney and heart muscle regeneration, Clara-like cell replacement for pulmonary and bronchial epithelial cells as well as for induction of neurogenesis in case of neurodegenerative diseases.
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Affiliation(s)
- Talita Glaser
- Departamento de Bioquímica , Instituto de Química, Universidade São Paulo, Av. Prof. Lineu Prestes, 748-Bloco 8S/Room 0858, CEP: 05508-900, São Paulo, SP, Brazil
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21
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Zippel N, Limbach CA, Ratajski N, Urban C, Luparello C, Pansky A, Kassack MU, Tobiasch E. Purinergic receptors influence the differentiation of human mesenchymal stem cells. Stem Cells Dev 2011; 21:884-900. [PMID: 21740266 DOI: 10.1089/scd.2010.0576] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Adult stem cells, including adipose tissue-derived mesenchymal stem cells (MSCs) or ectomesenchymal dental follicle cells (DFCs), attract considerable attention for their potential to differentiate into lineages, which are of major interest in the field of Regenerative Medicine. Purinergic receptors exert a wide range of biological actions in many cell and tissue types through extracellular nucleotides. Little is known about P2 receptors in adult stem cells and changes in their expression levels during differentiation. All known P2 receptors have been investigated, and a variety of P2X and P2Y receptor subtypes were detected in MSCs. Studies investigating intracellular calcium levels on receptor stimulation demonstrated that the found P2 receptors are metabolically active. Interestingly, up- or downregulation of several P2 receptor subtypes at gene and protein level was observed during adipogenic and osteogenic differentiation, and the effect on differentiation was directly influenced by both the application of agonists/antagonists and apyrase-induced nucleotide cleavage. Here, we show for the first time that the combination of several P2 receptors plays a role in the differentiation of adult stem cells. The expression pattern of the P2 receptors, as well as their fate in differentiation, varies in stem cells of mesenchymal origin if compared with stem cells of ectomesenchymal origin. The subtypes P2X6, P2Y4, and P2Y14 seem to be pivotal regulators in MSC commitment, as they are regulated in both adipogenic and osteogenic differentiation of adipose tissue-derived stem cells and DFCs. These findings provide new insights into the differentiation processes and might reveal novel options to influence stem cell fate in future applications.
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Affiliation(s)
- Nina Zippel
- Department of Natural Sciences, University of Applied Sciences Bonn-Rhein-Sieg, Rheinbach, Germany
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22
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Gendaszewska-Darmach E, Kucharska M. Nucleotide receptors as targets in the pharmacological enhancement of dermal wound healing. Purinergic Signal 2011; 7:193-206. [PMID: 21519856 PMCID: PMC3146642 DOI: 10.1007/s11302-011-9233-z] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2010] [Accepted: 04/10/2011] [Indexed: 12/15/2022] Open
Abstract
With a growing interest of the involvement of extracellular nucleotides in both normal physiology and pathology, it has become evident that P2 receptor agonists and antagonists may have therapeutic potential. The P2Y2 receptor agonists (diquafosol tetrasodium and denufosol tetrasodium) are in the phase 3 of clinical trials for dry eye and cystic fibrosis, respectively. The thienopyridine derivatives clopidogrel and ticlopidine (antagonists of the platelet P2Y12 receptor) have been used in cardiovascular medicine for nearly a decade. Purines and pyrimidines may be of therapeutic potential also in wound healing since ATP and UTP have been shown to have many hallmarks of wound healing factors. Recent studies have demonstrated that extracellular nucleotides take part in all phases of wound repair: hemostasis, inflammation, tissue formation, and tissue remodeling. This review is focused on the potent purines and pyrimidines which regulate many physiological processes important for wound healing.
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Affiliation(s)
- Edyta Gendaszewska-Darmach
- Institute of Technical Biochemistry, Faculty of Biotechnology and Food Sciences, Technical University of Lodz, Stefanowskiego 4/10, 90-924, Lodz, Poland,
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Costa-Junior HM, Mendes AN, Davis GHNG, da Cruz CM, Ventura ALM, Serezani CH, Faccioli LH, Nomizo A, Freire-de-Lima CG, Bisaggio RDC, Persechini PM. ATP-induced apoptosis involves a Ca2+-independent phospholipase A2 and 5-lipoxygenase in macrophages. Prostaglandins Other Lipid Mediat 2008; 88:51-61. [PMID: 18984060 DOI: 10.1016/j.prostaglandins.2008.09.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2008] [Revised: 09/16/2008] [Accepted: 09/29/2008] [Indexed: 01/10/2023]
Abstract
Macrophages express P2X(7) and other nucleotide (P2) receptors, and display the phenomena of extracellular ATP (ATP(e))-induced P2X(7)-dependent membrane permeabilization and cell death by apoptosis and necrosis. P2X(7) receptors also cooperate with toll-like receptors (TLRs) to induce inflammasome activation and IL-1beta secretion. We investigated signaling pathways involved in the induction of cell death by ATP(e) in intraperitoneal murine macrophages. Apoptosis (hypodiploid nuclei) and necrosis (LDH release) were detected 6h after an induction period of 20 min in the presence of ATP. Apoptosis was blocked by caspase 3 and caspase 9 inhibitors and by cyclosporin A. The MAPK inhibitors PD-98059, SB-203580 and SB-202190 provoked no significant effect on apoptosis, but SB-203580 blocked LDH release. Neither apoptosis nor necrosis was inhibited when both intra- and extracellular Ca(2+) were chelated during the induction period. Mepacrine, a generic PLA(2) inhibitor and BEL, an inhibitor of Ca(2+)-independent PLA(2) (iPLA(2)) blocked apoptosis, while pBPB and AACOOPF(3), inhibitors of secretory and Ca(2+)-dependent PLA(2) respectively, had no significant effect. Cycloxygenase inhibitors had no effect on apoptosis, while the inhibitors of lipoxygenase (LOX) and leukotriene biosynthesis nordihydroguaiaretic acid (NDGA), zileuton, AA-861, and MK-886 significantly decreased apoptosis. Neither NDGA nor MK-886 blocked apoptosis of 5-LOX(-/-) macrophages. CP-105696 and MK-571, antagonists of leukotriene receptors, had no significant effect on apoptosis. None of the inhibitors of PLA(2) and LOX/leukotriene pathway had a significant inhibitory effect on LDH release. Our results indicate that a Ca(2+)-independent step involving an iPLA(2) and 5-LOX are involved in the triggering of apoptosis but not necrosis by P2X(7) in macrophages.
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Affiliation(s)
- Helio Miranda Costa-Junior
- Laboratório de Imunobiofísica, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, 21941-902 Rio de Janeiro, RJ, Brazil
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Coppi E, Pugliese AM, Urbani S, Melani A, Cerbai E, Mazzanti B, Bosi A, Saccardi R, Pedata F. ATP modulates cell proliferation and elicits two different electrophysiological responses in human mesenchymal stem cells. Stem Cells 2007; 25:1840-9. [PMID: 17446563 DOI: 10.1634/stemcells.2006-0669] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Bone marrow-derived human mesenchymal stem cells (hMSCs) have the potential to differentiate into several cell lines. Extracellular adenosine 5'-triphosphate (ATP) acts as a potent signaling molecule mediating cell-to-cell communication. Particular interest has been focused in recent years on the role of ATP in stem cell proliferation and differentiation. In the present work, we demonstrate that hMSCs at early stages of culture (P0-P5) spontaneously release ATP, which decreases cell proliferation. Increased hMSC proliferation is induced by the unselective P2 antagonist pyridoxalphosphate-6-azophenyl-2',4'-disulfonate (PPADS) and by the selective P2Y1 antagonist 2'-deoxy-N6-methyladenosine3',5'-bisphosphate (MRS 2179). A functional role of extracellular ATP in modulating ionic conductances with the whole-cell and/or perforated patch-clamp techniques was also investigated. Exogenous ATP increased both the voltage-sensitive outward and inward currents in 47% of cells, whereas, in 31% of cells, only an increase in inward currents was found. Cells responding in this dual manner to ATP presented different resting membrane potentials. Both ATP-induced effects had varying sensitivity to the P2 antagonists PPADS and MRS 2179. Outward ATP-sensitive currents are carried by potassium ions, since they are blocked by cesium replacement and are Ca2+ -dependent because they are eliminated in the presence of 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid. On the basis of different electrophysiological and pharmacological characteristics, we conclude that outward ATP-sensitive currents are due to Ca2+ -dependent K+ -channel activation following stimulation of P2Y receptors, whereas inward ATP-sensitive currents are mediated by P2X receptor activation. In summary, ATP released in early life stages of hMSCs modulates their proliferation rate and likely acts as one of the early factors determining their cell fate. Disclosure of potential conflicts of interest is found at the end of this article.
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Affiliation(s)
- Elisabetta Coppi
- Department of Preclinical and Clinical Pharmacology, University of Florence, Viale Pieraccini 6, 50139 Florence, Italy
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Myrtek D, Idzko M. Chemotactic activity of extracellular nucleotideson human immune cells. Purinergic Signal 2007; 3:5-11. [PMID: 18404414 PMCID: PMC2096771 DOI: 10.1007/s11302-006-9032-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2006] [Accepted: 10/10/2006] [Indexed: 12/15/2022] Open
Abstract
Purinergic P2 receptors are a class of plasma membrane receptors that are express in many tissues and are ligated by extracellular nucleotides [such as adenosine triphosphate (ATP), adenosine diphosphate (ADP), uridine 5–triphosphate (UTP) and uridine 5–diphosphate (UDP)], which are released as a consequence of cell damage, cell stress, bacterial infection or other noxious stimuli. According to the molecular structure, P2 receptors are divided into two subfamilies: P2X and P2Y receptors. The P2X receptors are ligand-gated channels, whereas P2Y receptors are G-protein-coupled seven-membrane-spanning receptors. Several studies indicate that nucleotides play an important role in immune response modulation through their action on multiple cell types, including monocytes, mast cells, dendritic cells, neutrophils, and eosinophils. Recent work by our group and others identified extracellular nucleotides as chemotaxins for various human immune cells, including eosinophils, neutrophils and dendritic cells. In this review, we summarise recent findings in this field and put forward a hypothesis on the role of P2 receptors in the early recruitment of human immune cells to the site of inflammation.
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Affiliation(s)
- Daniel Myrtek
- Department of Pneumology, University-Hospital-Freiburg, Killianstrasse 5, 79106, Freiburg, Germany
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Milosevic J, Brandt A, Roemuss U, Arnold A, Wegner F, Schwarz SC, Storch A, Zimmermann H, Schwarz J. Uracil nucleotides stimulate human neural precursor cell proliferation and dopaminergic differentiation: involvement of MEK/ERK signalling. J Neurochem 2006; 99:913-23. [PMID: 17076658 DOI: 10.1111/j.1471-4159.2006.04132.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Isolation and propagation of neural stem cells derived from human brain tissue uniquely enables the study of human neurogenesis in vitro. In addition, ex vivo-expanded human neural stem/precursor cells (NPCs) may offer novel therapeutic strategies. We investigated the effects of extracellular nucleotides on the proliferation and differentiation of human mesencephalic neural stem/precursor cells (hmNPCs). When combined with the mitogens epidermal growth factor and fibroblast growth factor 2, UTP (1 microm) boosted proliferation of hmNPCs as shown by increased expression of the proliferation marker proliferating cell nuclear antigen (330%). UTP-induced proliferation was abrogated by the preferential P2Y receptor blocker pyridoxal phosphate-6-azophenyl-2',4'-disulphonic acid (PPADS). UTP also stimulated dopaminergic differentiation. Treatment with UTP (100 microm) increased the number of tyrosine hydroxylase (TH)-positive cells and TH protein by 267 and 319% respectively. UTP-stimulated dopaminergic differentiation of hmNPCs was blocked by the P2 receptor antagonists suramin (10 microm) and PPADS (100 microm). In addition, UDP (1 microm) enhanced TH protein expression by 194%. During differentiation, treatment with UTP stimulated the extracellular signal-regulated kinase (ERK) pathway. Both ERK1/2 phosphorylation and dopaminergic differentiation were inhibited by U0126, a selective ERK kinase inhibitor, as well as by suramin. When other P2 receptor agonists (ATP, ADP and adenosine 5'-O-(2-thiophosphate) (ADPbetaS); all 100 microm) were applied, both proliferation and dopaminergic differentiation of NPCs were compromised. We conclude that uracil nucleotides exert specific P2 receptor-mediated effects on midbrain-derived human NPCs, and may be used to enhance both proliferation and dopaminergic differentiation.
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Stefan C, Jansen S, Bollen M. Modulation of purinergic signaling by NPP-type ectophosphodiesterases. Purinergic Signal 2006; 2:361-70. [PMID: 18404476 PMCID: PMC2254485 DOI: 10.1007/s11302-005-5303-4] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2005] [Revised: 11/11/2005] [Accepted: 11/11/2005] [Indexed: 12/17/2022] Open
Abstract
Extracellular nucleotides can elicit a wide array of cellular responses by binding to specific purinergic receptors. The level of ectonucleotides is dynamically controlled by their release from cells, synthesis by ectonucleoside diphosphokinases and ectoadenylate kinases, and hydrolysis by ectonucleotidases. One of the four structurally unrelated families of ectonucleotidases is represented by the NPP-type ectophosphodiesterases. Three of the seven members of the NPP family, namely NPP1–3, are known to hydrolyze nucleotides. The enzymatic action of NPP1–3 (in)directly results in the termination of nucleotide signaling, the salvage of nucleotides and/or the generation of new messengers like ADP, adenosine or pyrophosphate. NPP2 is unique in that it hydrolyzes both nucleotides and lysophospholipids and, thereby, generates products that could synergistically promote cell motility. We review here the enzymatic properties of NPPs and analyze current evidence that links their nucleotide-hydrolyzing capability to epithelial and neural functions, the immune response and cell motility.
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Affiliation(s)
- Cristiana Stefan
- Division of Biochemistry, Department of Molecular Cell Biology, Faculty of Medicine, KULeuven, B-3000, Leuven, Belgium,
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Bernhard MK, Ulrich K. RT-PCR study of purinergic P2 receptors in hematopoietic cell lines. BIOCHEMISTRY (MOSCOW) 2006; 71:607-11. [PMID: 16827651 DOI: 10.1134/s0006297906060034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Seven P2X and fifteen P2Y receptors have been identified to date, partly on the basis of amino acid sequence homologies. The expression of all cloned human purinergic P2 receptors was investigated on the messenger RNA level in promonocytic U937 cells, erythroblastic K562 cells, and undifferentiated, dimethyl sulfoxide-differentiated granulocytic, and phorbol-12-myristate-13-acetate-differentiated monocytic HL60 cells. RT-PCR assays showed expression of several P2X receptors, whereas all P2Y receptors were found in at least some of the analyzed cells lines. Granulocytic and monocytic differentiation of HL60 cells lead to a partly dramatic up- or downregulation of receptor transcripts. The number of different P2 receptors expressed in each cell type showed a significant rise from U937 cells via K562 cells, undifferentiated and granulocytic, to monocytic HL60 cells. The total mRNA amounts being normalized to the glyceraldehyde-3-phosphate dehydrogenase levels demonstrated an even more distinct variability of absolute transcript levels. An increased number of different P2 receptors expressed were associated with an increased total average P2 receptor mRNA amount in each cell. This phenomenon of overexpression suggests self-inductive effects of purinergic signaling indicating its involvement in hematopoiesis and possibly in immunoreactive mediation.
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Affiliation(s)
- M K Bernhard
- Children's Hospital, University of Leipzig, Leipzig, D-04317, Germany.
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Capra V, Ravasi S, Accomazzo MR, Citro S, Grimoldi M, Abbracchio MP, Rovati GE. CysLT1 receptor is a target for extracellular nucleotide-induced heterologous desensitization: a possible feedback mechanism in inflammation. J Cell Sci 2006; 118:5625-36. [PMID: 16306225 DOI: 10.1242/jcs.02668] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Both cysteinyl-leukotrienes and extracellular nucleotides mediate inflammatory responses via specific G-protein-coupled receptors, the CysLT and the P2Y receptors, respectively. Since these mediators accumulate at sites of inflammation, and inflammatory cells express both classes of receptors, their responses are likely to be crossregulated. We investigated the molecular basis of desensitization and trafficking of the CysLT1 receptor constitutively and transiently expressed in the human monocyte/macrophage-like U937 or COS-7 cells in response to LTD4 or nucleotides. Exposure to agonist induced a rapid homologous desensitization of the CysLT1 receptor [as measured by the reduction in the maximal agonist-induced intracellular cytosolic Ca2+ ([Ca2+]i) transient], followed by receptor internalization (as assessed by equilibrium binding and confocal microscopy). Activation of P2Y receptors with ATP or UDP induced heterologous desensitization of the CysLT1 receptor. Conversely, LTD4-induced CysLT1 receptor activation had no effect on P2Y receptor responses, which suggests that the latter have a hierarchy in producing desensitizing signals. Furthermore, ATP/UDP-induced CysLT1 receptor desensitization was unable to cause receptor internalization, induced a faster recovery of CysLT1 functionality and was dependent upon protein kinase C. By contrast, homologous desensitization, which is probably dependent upon G-protein-receptor kinase 2 activation, induced a fast receptor downregulation and, accordingly, a slower recovery of CysLT1 functionality. Hence, CysLT1 receptor desensitization and trafficking are differentially regulated by the CysLT1 cognate ligand or by extracellular nucleotides. This crosstalk may have a profound physiological implication in the regulation of responses at sites of inflammation, and may represent just an example of a feedback mechanism used by cells to fine-tune their responses.
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Affiliation(s)
- Valérie Capra
- Laboratory of Molecular Pharmacology, Section of Eicosanoid Pharmacology, Department of Pharmacological Sciences, University of Milan, Via Balzaretti 9, 20133 Milan, Italy
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González FA, Weisman GA, Erb L, Seye CI, Sun GY, Velázquez B, Hernández-Pérez M, Chorna NE. Mechanisms for inhibition of P2 receptors signaling in neural cells. Mol Neurobiol 2006; 31:65-79. [PMID: 15953812 DOI: 10.1385/mn:31:1-3:065] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2004] [Accepted: 11/15/2004] [Indexed: 12/24/2022]
Abstract
Trophic factors are required to ensure neuronal viability and regeneration after neural injury. Although abundant information is available on the factors that cause the activation of astrocytes, little is known about the molecular mechanisms underlying the regulation of this process. Nucleotides released into the extracellular space from injured or dying neural cells can activate astrocytes via P2 nucleotide receptors. After a brief historical review and update of novel P2 receptor antagonists, this article focuses on recent advancements toward understanding molecular mechanisms that regulate G protein-coupled P2Y receptor signaling. Among P2Y receptor subtypes, the heptahelical P2Y2 nucleotide receptor interacts with vitronectin receptors via an RGD sequence in the first extracellular loop, and this interaction is required for effective signal transduction to activate mitogen-activated protein kinases ERK1/2, to mobilize intracellular calcium stores via activation of phospholipase C, protein kinase C isoforms, and to activate focal adhesion kinase and other signaling events. Ligation of vitronectin receptors with specific antibodies caused an inhibition of P2Y2 receptor-induced ERK1/2 and p38 phosphorylation and P2Y2 receptor-induced cytoskeleton rearrangement and DNA synthesis. Structure-function studies have identified agonist-induced phosphorylation of the C-terminus of the P2Y2 receptor, an important mechanism for receptor desensitization. Understanding selective mechanisms for regulating P2Y2 receptor signaling could provide novel targets for therapeutic strategies in the management of brain injury, synaptogenesis, and neurological disorders.
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Affiliation(s)
- Fernando A González
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Puerto Rico.
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Sak K, Illes P. Neuronal and glial cell lines as model systems for studying P2Y receptor pharmacology. Neurochem Int 2005; 47:401-12. [PMID: 16081187 DOI: 10.1016/j.neuint.2005.05.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2005] [Accepted: 05/31/2005] [Indexed: 11/18/2022]
Abstract
Investigation of the role of extracellular nucleotides in nervous system has been one of the main topics of the P2Y receptor research throughout the years. In parallel to numerous studies on primary culture systems, various neuronal and non-neuronal cell lines have been used to model in vitro the processes mediated by extracellular nucleotides. In this review article, a survey of expression profiles of G protein-coupled P2Y receptor subtypes in nervous-system-derived cell lines is presented, by analysing the receptor expression at the mRNA, protein, and functional level. The variability of receptor expression profiles in established cell lines is further discussed, bringing forward some general properties for neuronal and glial malignant cell lines.
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Affiliation(s)
- Katrin Sak
- Rudolf-Boehm Institute of Pharmacology and Toxicology, and Interdisciplinary Center for Clinical Research, Medical Faculty, University of Leipzig, D-04107 Leipzig, Germany.
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Vichalkovski A, Baltensperger K, Thomann D, Porzig H. Two different pathways link G-protein-coupled receptors with tyrosine kinases for the modulation of growth and survival in human hematopoietic progenitor cells. Cell Signal 2005; 17:447-59. [PMID: 15601623 DOI: 10.1016/j.cellsig.2004.09.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2004] [Accepted: 09/08/2004] [Indexed: 01/28/2023]
Abstract
The G-protein-coupled receptor agonists CXCL12 (SDF-1, a chemokine) and thrombin showed opposite effects on growth and survival of multipotent and erythroid human hematopoietic progenitor cells. CXCL12 promoted growth in multipotent cells by activating the RhoA-Rho kinase pathway. Its effect was largely blocked by Y-27632, a specific inhibitor of Rho kinase, and by clostridial toxin B, a specific inhibitor of Rho family proteins. Rho activation required a G(i)-mediated stimulation of tyrosine kinases, which was blocked by PP2 and tyrphostin AG 490, inhibitors of Src and Jak type kinases, respectively. By contrast, in erythroid cells, inhibitors of Src family and c-Abl tyrosine kinases (tyrphostin AG 82, PP2, imatinib) enhanced protein kinase C (PKC)-dependent cell growth and antagonized thrombin-promoted apoptosis by specifically stimulating PKCbeta activity. The PKC activating phorbol ester PMA (a growth factor in erythroid cells) induced the activation of Lyn and c-Abl tyrosine kinases, thus establishing a feedback inhibition of PKCbeta. Hence, developmental stage-specific crosstalk between PKC subtypes and tyrosine kinases appear to determine whether growth and survival of hematopoietic cells are promoted or inhibited by G-protein-coupled receptor agonists.
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Affiliation(s)
- Anton Vichalkovski
- Department of Pharmacology, University of Bern, Friedbuehlstrasse 49, CH-3010 Bern, Switzerland
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Kotevic I, Kirschner KM, Porzig H, Baltensperger K. Constitutive interaction of the P2Y2 receptor with the hematopoietic cell-specific G protein G(alpha16) and evidence for receptor oligomers. Cell Signal 2004; 17:869-80. [PMID: 15763429 DOI: 10.1016/j.cellsig.2004.11.011] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2004] [Revised: 11/03/2004] [Accepted: 11/03/2004] [Indexed: 11/16/2022]
Abstract
Hematopoietic cells uniquely express G(alpha16), a G protein alpha-subunit of the G(q)-type. G(alpha16) is obligatory for P2Y2 receptor-dependent Ca2+-mobilization in human erythroleukemia cells and induces hematopoietic cell differentiation. We tested whether P2Y2 receptors physically interact with G(alpha16). Receptor and G protein were fused to cyan (CFP) and yellow (YFP) variants of the green fluorescent protein (GFP), respectively. When expressed in K562 leukemia cells, the fusion proteins were capable of triggering a Ca2+-signal upon receptor stimulation, demonstrating their functional integrity. In fluorescence resonance energy transfer (FRET) measurements using confocal microscopy, a strong FRET signal from the plasma membrane region of fixed, resting cells was detected when the receptor was co-expressed with the G protein as the FRET acceptor, as well as when the CFP-tagged receptor was co-expressed with receptor fused to YFP. We conclude that, under resting conditions, G(alpha16) and P2Y2 receptors form constitutive complexes, and that the P2Y2 receptor is present as an oligomer.
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Affiliation(s)
- Ivana Kotevic
- Institute of Pharmacology, University of Bern, Friedbühlstrasse 49, 3010 Bern, Switzerland
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Schachtrup C, Scholzen TE, Grau V, Luger TA, Sorg C, Spener F, Kerkhoff C. L-FABP is exclusively expressed in alveolar macrophages within the myeloid lineage. Int J Biochem Cell Biol 2004; 36:2042-53. [PMID: 15203117 DOI: 10.1016/j.biocel.2004.03.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2003] [Revised: 03/15/2004] [Accepted: 03/19/2004] [Indexed: 01/15/2023]
Abstract
Peroxisome proliferator-activated receptors (PPARs) play a role in inflammation and, in particular, PPARgamma is involved in monocyte/macrophage differentiation. Members of the fatty acid-binding protein (FABP) family have been reported to function as transactivators for PPARs. Therefore, the expression of PPARs and FABPs in the myeloid lineage was investigated by real-time PCR and immunofluorescence analysis. We found adipocyte-, epidermal-, and heart-type FABP to be ubiquitously expressed within the myeloid lineage. In contrast, liver-type FABP was exclusively detected in murine alveolar macrophages (AM), confirmed on protein level by double fluorescence analysis. The PPAR subtypes also showed a temporally and spatially regulated expression pattern in myeloid cells: the beta-subtype was expressed in bone marrow, peritoneal, and alveolar macrophages, whereas it was not detected in dendritic cells (DCs). The gamma1-isoform was present in all cells, however, at different levels, whereas the gamma2-isoform was expressed in alveolar macrophages and dendritic cells. A low level PPARalpha mRNA could be detected in peritoneal macrophages and immature dendritic cells but not in mature dendritic cells and bone marrow macrophages. Interestingly, PPARalpha mRNA was also absent in the alveolar macrophages although liver-type FABP was expressed, indicating that gene expression of liver-type FABP was independent of PPARalpha. Since liver-type FABP is known as transactivator of PPARgamma the simultaneous expression of both proteins may have general implications for the activation of PPARgamma in alveolar macrophages.
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Wang L, Jacobsen SEW, Bengtsson A, Erlinge D. P2 receptor mRNA expression profiles in human lymphocytes, monocytes and CD34+ stem and progenitor cells. BMC Immunol 2004; 5:16. [PMID: 15291969 PMCID: PMC509419 DOI: 10.1186/1471-2172-5-16] [Citation(s) in RCA: 146] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2004] [Accepted: 08/03/2004] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Extracellular nucleotides (ATP, ADP, UTP and UDP) exert a wide range of biological effects in blood cells mediated by multiple ionotropic P2X receptors and G protein-coupled P2Y receptors. Although pharmacological experiments have suggested the presence of several P2 receptor subtypes on monocytes and lymphocytes, some results are contradictory. Few physiological functions have been firmly established to a specific receptor subtype, partly because of a lack of truly selective agonists and antagonists. This stimulated us to investigate the expression of P2X and P2Y receptors in human lymphocytes and monocytes with a newly established quantitative mRNA assay for P2 receptors. In addition, we describe for the first time the expression of P2 receptors in CD34+ stem and progenitor cells implicating a potential role of P2 receptors in hematopoietic lineage and progenitor/stem cell function. RESULTS Using a quantitative mRNA assay, we assessed the hypothesis that there are specific P2 receptor profiles in inflammatory cells. The P2X4 receptor had the highest expression in lymphocytes and monocytes. Among the P2Y receptors, P2Y12 and P2Y2 had highest expression in lymphocytes, while the P2Y2 and P2Y13 had highest expression in monocytes. Several P2 receptors were expressed (P2Y2, P2Y1, P2Y12, P2Y13, P2Y11, P2X1, P2X4) in CD34+ stem and progenitor cells. CONCLUSIONS The most interesting findings were the high mRNA expression of P2Y12 receptors in lymphocytes potentially explaining the anti-inflammatory effects of clopidogrel, P2Y13 receptors in monocytes and a previously unrecognised expression of P2X4 in lymphocytes and monocytes. In addition, for the first time P2 receptor mRNA expression patterns was studied in CD34+ stem and progenitor cells. Several P2 receptors were expressed (P2Y2, P2Y1, P2Y12, P2Y13, P2Y11, P2X1, P2X4), indicating a role in differentiation and proliferation. Thus, it is possible that specific antibodies to P2 receptors could be used to identify progenitors for monocytes, lymphocytes and megakaryocytes.
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Affiliation(s)
- Lingwei Wang
- Department of Cardiology, Lund University Hospital, S-221 85 Lund, Sweden
| | - Sten Eirik W Jacobsen
- Department of Hematopoietic Stem Cell Laboratory, Lund Center for Stem Cell Biology and Cell Therapy, Lund University Hospital, S-221 85 Lund, Sweden
| | - Anders Bengtsson
- Department of Rheumatology, Lund University Hospital, S-221 85 Lund, Sweden
| | - David Erlinge
- Department of Cardiology, Lund University Hospital, S-221 85 Lund, Sweden
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Lemoli RM, Ferrari D, Fogli M, Rossi L, Pizzirani C, Forchap S, Chiozzi P, Vaselli D, Bertolini F, Foutz T, Aluigi M, Baccarani M, Di Virgilio F. Extracellular nucleotides are potent stimulators of human hematopoietic stem cells in vitro and in vivo. Blood 2004; 104:1662-70. [PMID: 15161674 DOI: 10.1182/blood-2004-03-0834] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Although extracellular nucleotides support a wide range of biologic responses of mature blood cells, little is known about their effect on blood cell progenitor cells. In this study, we assessed whether receptors for extracellular nucleotides (P2 receptors [P2Rs]) are expressed on human hematopoietic stem cells (HSCs), and whether activation by their natural ligands, adenosine triphosphate (ATP) and uridine triphosphate (UTP), induces HSC proliferation in vitro and in vivo. Our results demonstrated that CD34(+) HSCs express functional P2XRs and P2YRs of several subtypes. Furthermore, stimulation of CD34(+) cells with extracellular nucleotides caused a fast release of Ca(2+) from intracellular stores and an increase in ion fluxes across the plasma membrane. Functionally, ATP and, to a higher extent, UTP acted as potent early acting growth factors for HSCs, in vitro, because they strongly enhanced the stimulatory activity of several cytokines on clonogenic CD34(+) and lineage-negative CD34(-) progenitors and expanded more primitive CD34(+)-derived long-term culture-initiating cells. Furthermore, xenogenic transplantation studies showed that short-term preincubation with UTP significantly expanded the number of marrow-repopulating HSCs in nonobese diabetic/severe combined immunodeficiency mice. Our data suggest that extracellular nucleotides may provide a novel and powerful tool to modulate HSC functions.
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Affiliation(s)
- Roberto M Lemoli
- Institute of Hematology and Medical Oncology L. & A. Seràgnoli, University of Bologna, Italy.
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