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Popa SJ, Stewart SE, Moreau K. Unconventional secretion of annexins and galectins. Semin Cell Dev Biol 2018; 83:42-50. [PMID: 29501720 PMCID: PMC6565930 DOI: 10.1016/j.semcdb.2018.02.022] [Citation(s) in RCA: 103] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 02/23/2018] [Accepted: 02/26/2018] [Indexed: 12/31/2022]
Abstract
Eukaryotic cells have a highly evolved system of protein secretion, and dysfunction in this pathway is associated with many diseases including cancer, infection, metabolic disease and neurological disorders. Most proteins are secreted using the conventional endoplasmic reticulum (ER)/Golgi network and as such, this pathway is well-characterised. However, several cytosolic proteins have now been documented as secreted by unconventional transport pathways. This review focuses on two of these proteins families: annexins and galectins. The extracellular functions of these proteins are well documented, as are associations of their perturbed secretion with several diseases. However, the mechanisms and regulation of their secretion remain poorly characterised, and are discussed in this review. This review is part of a Special Issues of SCDB on 'unconventional protein secretion' edited by Walter Nickel and Catherine Rabouille.
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Affiliation(s)
- Stephanie J Popa
- University of Cambridge, Metabolic Research Laboratories, Wellcome Trust-Medical Research Council Institute of Metabolic Science, Cambridge, CB2 0QQ, UK
| | - Sarah E Stewart
- University of Cambridge, Metabolic Research Laboratories, Wellcome Trust-Medical Research Council Institute of Metabolic Science, Cambridge, CB2 0QQ, UK
| | - Kevin Moreau
- University of Cambridge, Metabolic Research Laboratories, Wellcome Trust-Medical Research Council Institute of Metabolic Science, Cambridge, CB2 0QQ, UK.
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Abdoul-Azize S, Dubus I, Vannier JP. Improvement of dexamethasone sensitivity by chelation of intracellular Ca2+ in pediatric acute lymphoblastic leukemia cells through the prosurvival kinase ERK1/2 deactivation. Oncotarget 2018; 8:27339-27352. [PMID: 28423696 PMCID: PMC5432339 DOI: 10.18632/oncotarget.16039] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 02/15/2017] [Indexed: 01/08/2023] Open
Abstract
Previous studies have demonstrated that glucocorticoid hormones, including dexamethasone, induced alterations in intracellular calcium homeostasis in acute lymphoblastic leukemia (ALL) cells. However, the mechanism by which intracellular calcium homeostasis participates in dexamethasone sensitivity and resistance on ALL cells remains elusive. Here, we found that treatment of cells with dexamethasone resulted in increased intracellular calcium concentrations through store-operated calcium entry stimulation, which was curtailed by store-operated calcium channel blockers. We show that BAPTA-AM, an intracellular Ca2+ chelator, synergistically enhances dexamethasone lethality in two human ALL cell lines and in three primary specimens. This effect correlated with the inhibition of the prosurvival kinase ERK1/2 signaling pathway. Chelating intracellular calcium with Bapta-AM or inhibiting ERK1/2 with PD98059 significantly potentiated dexamethasone-induced mitochondrial membrane potential collapse, reactive oxygen species production, cytochrome c release, caspase-3 activity, and cell death. Moreover, we show that thapsigargin elevates intracellular free calcium ion level, and activates ERK1/2 signaling, resulting in the inhibition of dexamethasone-induced ALL cells apoptosis. Together, these results indicate that calcium-related ERK1/2 signaling pathway contributes to protect cells from dexamethasone sensitivity by limiting mitochondrial apoptotic pathway. This report provides a novel resistance pathway underlying the regulatory effect of dexamethasone on ALL cells.
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Affiliation(s)
- Souleymane Abdoul-Azize
- Micro-Environnement et Renouvellement Cellulaire Intégré, MERCI UPRES EA 3829, Faculté de Médecine et Pharmacie, Université de Rouen, 76183 Rouen Cedex, France.,Current address: Unité Inserm U1234/Université de Rouen/IRIB, Rouen, France
| | - Isabelle Dubus
- Micro-Environnement et Renouvellement Cellulaire Intégré, MERCI UPRES EA 3829, Faculté de Médecine et Pharmacie, Université de Rouen, 76183 Rouen Cedex, France.,Current address: Unité Inserm U1234/Université de Rouen/IRIB, Rouen, France
| | - Jean-Pierre Vannier
- Micro-Environnement et Renouvellement Cellulaire Intégré, MERCI UPRES EA 3829, Faculté de Médecine et Pharmacie, Université de Rouen, 76183 Rouen Cedex, France.,Service Immuno-Hémato-Oncologie Pédiatrique, CHU Charles Nicolle, 76031 ROUEN Cedex, France.,Current address: Unité Inserm U1234/Université de Rouen/IRIB, Rouen, France
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Wang Z, Chen Z, Yang J, Yang Z, Yin J, Zuo G, Duan X, Shen H, Li H, Chen G. Identification of two phosphorylation sites essential for annexin A1 in blood-brain barrier protection after experimental intracerebral hemorrhage in rats. J Cereb Blood Flow Metab 2017; 37:2509-2525. [PMID: 27634935 PMCID: PMC5531348 DOI: 10.1177/0271678x16669513] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Annexin A1 has been reported to exert a blood-brain barrier protection. This study was designed to examine the role of annexin A1 in intracerebral hemorrhage-induced blood-brain barrier dysfunction. A collagenase intracerebral hemorrhage model was performed in adult male Sprague Dawley rats. First, a possible relationship between annexin A1 and intracerebral hemorrhage pathology was confirmed by a loss of annexin A1 in the cerebrovascular endothelium and serum of intracerebral hemorrhage rats, and the rescue effects of i.v. administration of human recombinant annexin A1 in vivo and annexin A1 overexpression in vitro on the barrier function of brain microvascular endothelial cells exposed to intracerebral hemorrhage stimulus. Second, we found that intracerebral hemorrhage significantly increased the phosphorylation ratio of annexin A1 at the serine/threonine residues. Finally, based on site-specific mutagenesis, we identified two phosphorylation sites (a) annexin A1 phosphorylation at threonine 24 is required for its interaction with actin cytoskeleton, and (b) phosphorylation at serine27 is essential for annexin A1 secretion, both of which were essential for maintaining cytoskeleton integrity and paracellular permeability. In conclusion, annexin A1 prevents intracerebral hemorrhage-induced blood-brain barrier dysfunction in threonine 24 and serine27 phosphorylation-dependent manners. Annexin A1 phosphorylation may be a self-help strategy in brain microvascular endothelial cells after intracerebral hemorrhage; however, that was almost completely abolished by the intracerebral hemorrhage-induced loss of annexin A1.
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Affiliation(s)
- Zhong Wang
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Zhouqing Chen
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Junjie Yang
- Department of Cardiovascular Surgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Ziying Yang
- Department of Cardiovascular Surgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Jia Yin
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Gang Zuo
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Xiaochun Duan
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Haitao Shen
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Haiying Li
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Gang Chen
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, China
- Gang Chen, Department of Neurosurgery, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou 215006, China. Haiying Li, Department of Neurosurgery, The first Affiliated Hosipital of Soochow University, 188 Shizi Street, Suzhou 215006, China.
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Abdoul-Azize S, Dubus I, Vannier JP. [Modulation of glucocorticoid sensitivity in acute lymphoblastic leukemia: Pyr3, a new therapeutic tool?]. Med Sci (Paris) 2017; 33:130-132. [PMID: 28240201 DOI: 10.1051/medsci/20173302005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Souleymane Abdoul-Azize
- Micro-environnement et renouvellement cellulaire intégré, MERCI EA 3829, faculté de médecine et pharmacie, université de Rouen, 22, boulevard Gambetta, 76183 Rouen Cedex, France
| | - Isabelle Dubus
- Micro-environnement et renouvellement cellulaire intégré, MERCI EA 3829, faculté de médecine et pharmacie, université de Rouen, 22, boulevard Gambetta, 76183 Rouen Cedex, France
| | - Jean-Pierre Vannier
- Micro-environnement et renouvellement cellulaire intégré, MERCI EA 3829, faculté de médecine et pharmacie, université de Rouen, 22, boulevard Gambetta, 76183 Rouen Cedex, France - Service immuno-hémato-oncologie pédiatrique, CHU Charles Nicolle, 1, rue de Germont, 76031 Rouen Cedex, France
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Nair S, Arora S, Lim JY, Lee LH, Lim LH. The regulation of TNFα production after heat and endotoxin stimulation is dependent on Annexin-A1 and HSP70. Cell Stress Chaperones 2015; 20:583-93. [PMID: 25753354 PMCID: PMC4463914 DOI: 10.1007/s12192-015-0580-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Revised: 02/15/2015] [Accepted: 02/16/2015] [Indexed: 10/23/2022] Open
Abstract
Febrile temperatures can induce stress responses which protect cells from damage and can reduce inflammation during infections and sepsis. However, the mechanisms behind the protective functions of heat in response to the bacterial endotoxin LPS are unclear. We have recently shown that Annexin-1 (ANXA1)-deficient macrophages exhibited higher TNFα levels after LPS stimulation. Moreover, we have previously reported that ANXA1 can function as a stress protein. Therefore in this study, we determined if ANXA1 is involved in the protective effects of heat on cytokine levels in macrophages after heat and LPS. Exposure of macrophages to 42 °C for 1 h prior to LPS results in an inhibition of TNFα production, which was not evident in ANXA1(-/-) macrophages. We show that this regulation involves primarily MYD88-independent pathways. ANXA1 regulates TNFα mRNA stability after heat and LPS, and this is dependent on endogenous ANXA1 expression and not exogenously secreted factors. Further mechanistic studies revealed the possible involvement of the heat shock protein HSP70 and JNK in the heat and inflammatory stress response regulated by ANXA1. This study shows that ANXA1, an immunomodulatory protein, is critical in the heat stress response induced after heat and endotoxin stimulation.
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Affiliation(s)
- Sunitha Nair
- />Department of Physiology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, 28 Medical Drive, Singapore, 117456 Singapore
- />NUS Immunology Program, Life Sciences Institute, National University of Singapore, Singapore, 117456 Singapore
| | - Suruchi Arora
- />Department of Physiology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, 28 Medical Drive, Singapore, 117456 Singapore
- />NUS Immunology Program, Life Sciences Institute, National University of Singapore, Singapore, 117456 Singapore
| | - Jyue Yuan Lim
- />Singapore Immunology Network (SigN), 8A Biomedical Grove, Immunos, Singapore, 138648 Singapore
| | - Lay Hoon Lee
- />Department of Physiology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, 28 Medical Drive, Singapore, 117456 Singapore
- />NUS Immunology Program, Life Sciences Institute, National University of Singapore, Singapore, 117456 Singapore
| | - Lina H.K. Lim
- />Department of Physiology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, 28 Medical Drive, Singapore, 117456 Singapore
- />NUS Immunology Program, Life Sciences Institute, National University of Singapore, Singapore, 117456 Singapore
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Brancaleone V, Dalli J, Bena S, Flower RJ, Cirino G, Perretti M. Evidence for an anti-inflammatory loop centered on polymorphonuclear leukocyte formyl peptide receptor 2/lipoxin A4 receptor and operative in the inflamed microvasculature. THE JOURNAL OF IMMUNOLOGY 2011; 186:4905-14. [PMID: 21398608 DOI: 10.4049/jimmunol.1003145] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The importance of proresolving mediators in the overall context of the resolution of acute inflammation is well recognized, although little is known about whether these anti-inflammatory and proresolving molecules act in concert. In this article, we focused on lipoxin A(4) (LXA(4)) and annexin A1 (AnxA1) because these two very different mediators converge on a single receptor, formyl peptide receptor type 2 (FPR2/ALX). Addition of LXA(4) to human polymorphonuclear leukocytes (PMNs) provoked a concentration- and time-dependent mobilization of AnxA1 onto the plasma membrane, as determined by Western blotting and flow cytometry analyses. This property was shared by another FPR2/ALX agonist, antiflammin-2, and partly by fMLF or peptide Ac2-26 (an AnxA1 derivative that can activate all three members of the human FPR family). An FPR2/ALX antagonist blocked AnxA1 mobilization activated by LXA(4) and antiflammin-2. Analysis of PMN degranulation patterns and phospho-AnxA1 status suggested a model in which the two FPR2/ALX agonists mobilize the cytosolic (and not the granular) pool of AnxA1 through an intermediate phosphorylation step. Intravital microscopy investigations of the inflamed mesenteric microvasculature of wild-type and AnxA1(-/-) mice revealed that LXA(4) provoked leukocyte detachment from the postcapillary venule endothelium in the former (>50% within 10 min; p < 0.05), but not the latter genotype (∼15%; NS). Furthermore, recruitment of Gr1(+) cells into dorsal air-pouches, inflamed with IL-1β, was significantly attenuated by LXA(4) in wild-type, but not AnxA1(-/-), mice. Collectively, these data prompt us to propose the existence of an endogenous network in anti-inflammation centered on PMN AnxA1 and activated by selective FPR2/ALX agonists.
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Affiliation(s)
- Vincenzo Brancaleone
- William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, London EC1M 6BQ, United Kingdom
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Rondepierre F, Bouchon B, Papon J, Bonnet-Duquennoy M, Kintossou R, Moins N, Maublant J, Madelmont JC, D'Incan M, Degoul F. Proteomic studies of B16 lines: involvement of annexin A1 in melanoma dissemination. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2008; 1794:61-9. [PMID: 18952200 DOI: 10.1016/j.bbapap.2008.09.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2008] [Revised: 08/01/2008] [Accepted: 09/18/2008] [Indexed: 01/31/2023]
Abstract
To identify proteins involved in melanoma metastasis mechanisms, comparative proteomic studies were undertaken on B16F10 and B16Bl6 melanoma cell lines and their subsequent syngenic primary tumours as pulmonary metastases were present only in the mice bearing a B16Bl6 tumour. 2DE analyses followed by MALDI-TOF identification showed variations of 6 proteins in vitro and 13 proteins in vivo. Differential expressed proteins in tumours were related to energy production and storage. Two differentially expressed proteins which had not been previously associated to melanoma progression, annexin A1 (ANXA1) and creatine kinase B (CKB), were found both in cells and in tumours. To characterize ANXA1 involvement in melanoma B16 dissemination, we reduced ANXA1 protein level by siRNA and observed a significant decrease of B16Bl6 cell invasion through Matrigel coated chambers. We further demonstrated that the presence of several formyl peptide receptors (FPR1, FPRrs1 and 2) revealed by qRT-PCR, played a role in B16 invasion: incubation of B16Bl6 cells with the FPR agonist (fMLP) or antagonist (tBOC) enhanced or decreased Matrigel coated chamber invasion respectively, with a correlation of ANXA1 levels in both treatments. As ANXA1 could bind to FPRs, this should amplify invasion and enhance melanoma dissemination.
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Affiliation(s)
- Fabien Rondepierre
- Imagerie Moléculaire et Thérapie Vectorisée, Rue Montalembert, 63005 Clermont-Ferrand Cedex, France
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Kim HJ, Kirsch T. Collagen/annexin V interactions regulate chondrocyte mineralization. J Biol Chem 2008; 283:10310-7. [PMID: 18281278 DOI: 10.1074/jbc.m708456200] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Physiological mineralization in growth plate cartilage is highly regulated and restricted to terminally differentiated chondrocytes. Because mineralization occurs in the extracellular matrix, we asked whether major extracellular matrix components (collagens) of growth plate cartilage are directly involved in regulating the mineralization process. Our findings show that types II and X collagen interacted with cell surface-expressed annexin V. These interactions led to a stimulation of annexin V-mediated Ca(2+) influx resulting in an increased intracellular Ca(2+) concentration, [Ca(2+)](i), and ultimately increased alkaline phosphatase activity and mineralization of growth plate chondrocytes. Consequently, stimulation of these interactions (ascorbate to stimulate collagen synthesis, culturing cells on type II collagen-coated dishes, or overexpression of full-length annexin V) resulted in increase of [Ca(2+)](i), alkaline phosphatase activity, and mineralization of growth plate chondrocytes, whereas inhibition of these interactions (3,4-dehydro-l-proline to inhibit collagen secretion, K-201, a specific annexin channel blocker, overexpression of N terminus-deleted mutant annexin V that does not bind to type II collagen and shows reduced Ca(2+) channel activities) decreased [Ca(2+)](i), alkaline phosphatase activity, and mineralization. In conclusion, the interactions between collagen and annexin V regulate mineralization of growth plate cartilage. Because annexin V is up-regulated during pathological mineralization events of articular cartilage, it is possible that these interactions also regulate pathological mineralization.
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Affiliation(s)
- Hyon Jong Kim
- Musculoskeletal Research Laboratories, Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
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Calcium-dependent proapoptotic effect of Taenia solium metacestodes annexin B1 on human eosinophils: A novel strategy to prevent host immune response. Int J Biochem Cell Biol 2008; 40:2151-63. [DOI: 10.1016/j.biocel.2008.02.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2007] [Revised: 01/30/2008] [Accepted: 02/18/2008] [Indexed: 01/22/2023]
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Kotsyfakis M, Vontas J, Siden-Kiamos I, Louis C. The annexin gene family in the malaria mosquito Anopheles gambiae. INSECT MOLECULAR BIOLOGY 2005; 14:555-62. [PMID: 16164611 DOI: 10.1111/j.1365-2583.2005.00586.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Annexins belong to a class of proteins that are known to bind to, and hold together structures such as membranes. Interestingly, Anopheles gambiae (and Drosophila melanogaster) annexins bind Plasmodium ookinetes in vitro. In the malaria mosquito three genes in two cytogenetic loci on chromosome arm 2R encode annexin homologues; their expression, monitored by quantitative real-time PCR during mosquito development, as well as in various tissues, revealed little fluctuation in patterns of expression during all life stages. A different mode of transcription was observed for the three genes in the midgut in relation to the uptake of a blood meal. Immunohistochemical staining of midguts and ovaries with polyclonal anti-annexin sera reveals that the Anopheles polypeptides are present in the epithelial cells of both tissues and associated with the plasma membrane.
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Affiliation(s)
- M Kotsyfakis
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Vassilika Vouton, Heraklion, Crete, Greece
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Abstract
Annexins are a well-known multigene family of Ca(2+)-regulated phospholipid-binding and membrane-binding proteins. Recent work employing annexin-knockdown or - knockout models has provided new insights into the biological functions of different annexin proteins. Transient annexin depletion by RNA interference and the expression of dominant-negative mutant proteins has revealed roles for the proteins in membrane processes ranging from the control of membrane structure to certain membrane transport phenomena. Although such functions correlate well with the ability of annexins to interact with cellular membranes in a reversible and regulated manner, some activities are membrane independent, probably because annexins can also engage in specific protein-protein interactions. Among other things, this is evident in annexin A1- and A2-knockout mice, which show impaired regulation of neutrophil extravasation and defects in plasmin generation, respectively.
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Affiliation(s)
- Ursula Rescher
- Institute of Medical Biochemistry, Center for Molecular Biology of Inflammation, University of Münster, von-Esmarch-Strasse 56, Münster 48149, Germany
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Castro-Caldas M, Mendes AF, Duarte CB, Lopes MCF. Dexamethasone-induced and estradiol-induced CREB activation and annexin 1 expression in CCRF-CEM lymphoblastic cells: evidence for the involvement of cAMP and p38 MAPK. Mediators Inflamm 2004; 12:329-37. [PMID: 14668092 PMCID: PMC1781631 DOI: 10.1080/09629350310001633351] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
AIMS Annexin 1 (ANXA1), a member of the annexin family of calcium-binding and phospholipid-binding proteins, is a key mediator of the anti-inflammatory actions of steroid hormones. We have previously demonstrated that, in the human lymphoblastic CCRF-CEM cell line, both the synthetic glucocorticoid hormone, dexamethasone (Dex), and the estrogen hormone, 17beta-estradiol (E2beta), induce the synthesis of ANXA1, by a mechanism independent of the activation of their nuclear receptors. Recently, it was reported that the gene coding for ANXA1 contains acAMP-responsive element (CRE). In this work, we investigated whether Dex and E2beta were able to induce the activation of CRE binding proteins (CREB) in the CCRF-CEM cells. Moreover, we studied the intracellular signalling pathways involved in CREB activation and ANXA1 synthesis in response to Dex and E2beta; namely, the role of cAMP and the p38 mitogen activated protein kinase (MAPK). RESULTS The results show that Dex and E2beta were as effective as the cAMP analogue, dBcAMP, in inducing CREB activation. On the contrary, dBcAMP induced ANXA1 synthesis as effectively as these steroid hormones. Furthermore, the cAMP antagonist, Rp-8-Br-cAMPS, and the specific p38 MAPK inhibitor,SB203580, effectively prevented both Dex-induced, E2beta-induced and dBcAMP-induced CREB activation and ANXA1 synthesis. CONCLUSIONS Taken together, our results suggest that,in CCRF-CEM cells, Dex-induced and E2beta-inducedANXA1 expression requires the activation of the transcription factor CREB, which in turn seems to be mediated by cAMP and the p38 MAPK. These findings also suggest that, besides the nuclear steroid hormone receptors, other transcription factors, namely CREB, may play important roles in mediating the anti-inflammatory actions of glucocorticoids and oestrogen hormones.
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Affiliation(s)
- M Castro-Caldas
- Centre for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
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Kim YS, Ko J, Kim IS, Jang SW, Sung HJ, Lee HJ, Lee SY, Kim Y, Na DS. PKCδ-dependent cleavage and nuclear translocation of annexin A1 by phorbol 12-myristate 13-acetate. ACTA ACUST UNITED AC 2003; 270:4089-94. [PMID: 14519120 DOI: 10.1046/j.1432-1033.2003.03800.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Annexin A1 (ANX-1), a calcium-dependent, phospholipid binding protein, is known to be involved in diverse cellular processes, including regulation of cell growth and differentiation, apoptosis, and inflammation. The mitogen phorbol 12-myristate 13-acetate (PMA) induces expression and phosphorylation of ANX-1. However, the roles of ANX-1 in PMA-induced signal transduction is unknown. Here, we study the cellular localization of ANX-1 in the PMA-induced signal transduction process. We have found that PMA induces the cleavage of ANX-1 in human embryonic kidney (HEK) 293 cells, and that the cleaved form of ANX-1 translocates to the nucleus. The PMA-induced nuclear translocation of ANX-1 was inhibited by the protein kinase C (PKC)delta-specific inhibitor rottlerin, indicating that PKCdelta plays a role in nuclear translocation of the cleaved ANX-1. We propose a novel mechanism of PMA-induced translocation of ANX-1 to the nucleus that may participate in the regulation of cell proliferation and differentiation.
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Affiliation(s)
- Yoon S Kim
- Department of Biochemistry and Molecular Biology, University of Ulsan College of Medicine, Seoul, Korea
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Castro-Caldas M, Mendes AF, Carvalho AP, Duarte CB, Lopes MC. Dexamethasone prevents interleukin-1beta-induced nuclear factor-kappaB activation by upregulating IkappaB-alpha synthesis, in lymphoblastic cells. Mediators Inflamm 2003; 12:37-46. [PMID: 12745547 PMCID: PMC1781587 DOI: 10.1080/0962935031000096953] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
AIMS Glucocorticoids (GCs) exert some of their anti-inflammatory actions by preventing the activation of the transcription factor nuclear factor (NF)-kappaB. The GC-dependent inhibition of NF-kappaB may occur at different levels, but the mechanisms involved are still incompletely understood. In this work, we investigated whether the synthetic GC, dexamethasone (Dex), modulates the activity of NF-kappaB in the lymphoblastic CCRF-CEM cell line. We also evaluated the ability of Dex to prevent the activation of NF-kappaB in response to the potent proinflammatory cytokine, interleukin (IL)-1beta. RESULTS Exposure of the cells to Dex (1 microM) induced the rapid degradation of IkappaB-alpha, leading to the transient translocation of the NF-kappaB family members p65 and p50 from the cytoplasm to the nucleus, as evaluated by western blot. Electrophoretic mobility shift assays revealed that, in the nucleus, these NF-kappaB proteins formed protein-DNA complexes, indicating a transient activation of NF-kappaB. Additionally, Dex also induced de novo synthesis of IkappaB-alpha, following its degradation. Finally, when the cells were exposed to Dex (1 microM) prior to stimulation with IL-1beta (20 ng/ml), Dex was efficient in preventing IL-1beta-induced NF-kappaB activation. The GC antagonist, RU 486 (10 microM), did not prevent any of the effects of Dex reported here. CONCLUSION Our results indicate that, in CCRF-CEM cells, Dex prevents NF-kappaB activation, induced by IL-1beta, by a mechanism that involves the upregulation of IkappaB-alpha synthesis, and that depends on the early and transient activation of NF-kappaB.
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Affiliation(s)
- M Castro-Caldas
- Centre for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal
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