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Gómez-Henao W, Saavedra R, Chávez-Sánchez FR, Lascurain R, Zenteno E, Tenorio EP. Expression Dynamics of the O-Glycosylated Proteins Recognized by Amaranthus leucocarpus Lectin in T Lymphocytes and Its Relationship With Moesin as an Alternative Mechanism of Cell Activation. Front Immunol 2021; 12:788880. [PMID: 34917095 PMCID: PMC8669815 DOI: 10.3389/fimmu.2021.788880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Accepted: 11/11/2021] [Indexed: 11/13/2022] Open
Abstract
T lymphocyte activation begins with antigen/MHC recognition by the TCR/CD3 complex followed by a costimulatory signal provided by CD28. The search for novel costimulatory molecules has been extensive due to their potential use as immunotherapeutic targets. Although some molecules have been identified, they are unable to provide sustainable signaling to allow for proper T cell activation and proliferation. It has been shown that the Amaranthus leucocarpus lectin (ALL) can be used as an in vitro costimulator of CD4+ lymphocytes in the presence of anti-CD3 mAb; this lectin specifically recognizes O-glycans of the Galβ1-3GalNAc-O-Ser/Thr type, including a 70-kDa moesin-like protein that has been suggested as the costimulatory molecule. However, the identity of this molecule has not been confirmed and such costimulation has not been analyzed in CD8+ lymphocytes. We show herein that the expression kinetics of the glycoproteins recognized by ALL (gpALL) is different in CD4+ and CD8+ T cells, unlike moesin expression. Results from IP experiments demonstrate that the previously described 70-kDa moesin-like protein is an O-glycosylated form of moesin (O-moesin) and that in vitro stimulation with anti-CD3 and anti-moesin mAb induces expression of the activation molecules CD69 and CD25, proliferation and IL-2 production as efficiently as cells costimulated with ALL or anti-CD28. Overall, our results demonstrate that O-moesin is expressed in CD4+ and CD8+ T lymphocytes and that moesin provides a new costimulatory activation signal in both T cell subsets.
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Affiliation(s)
- Wilton Gómez-Henao
- Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Rafael Saavedra
- Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | | | - Ricardo Lascurain
- Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Edgar Zenteno
- Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Eda Patricia Tenorio
- Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
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Wang L, Li Q, Du J, Chen B, Li Q, Huang X, Guo X, Huang Q. Advanced glycation end products induce moesin phosphorylation in murine retinal endothelium. Acta Diabetol 2012; 49:47-55. [PMID: 21327982 DOI: 10.1007/s00592-011-0267-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Accepted: 02/02/2011] [Indexed: 12/20/2022]
Abstract
Increase in vascular permeability is the most important pathological event during the development of diabetic retinopathy. Deposition of advanced glycation end products (AGEs) plays a crucial role in the process of diabetes. This study was to investigate the role of moesin and its underlying signal transduction in retinal vascular hyper-permeability induced by AGE-modified mouse serum albumin (AGE-MSA). Female C57BL/6 mice were used to produce an AGE-treated model by intraperitoneal administration of AGE-MSA for seven consecutive days. The inner blood-retinal barrier was quantified by Evans blue leakage assay. Endothelial F-actin cytoskeleton in retinal vasculature was visualized by fluorescence probe staining. The expression and phosphorylation of moesin in retinal vessels were detected by RT-PCR and western blotting. Further studies were performed to explore the effects of Rho kinase (ROCK) and p38 MAPK pathway on the involvement of moesin in AGE-induced retinal vascular hyper-permeability response. Treatment with AGE-MSA significantly increased the permeability of the retinal microvessels and induced the disorganization of F-actin in retinal vascular endothelial cells. The threonine (T558) phosphorylation of moesin in retinal vessels was enhanced remarkably after AGE administration. The phosphorylation of moesin was attenuated by inhibitions of ROCK and p38 MAPK, while this treatment also prevented the dysfunction of inner blood-retinal barrier and the reorganization of F-actin in retinal vascular endothelial cells. These results demonstrate that moesin is involved in AGE-induced retinal vascular endothelial dysfunction and the phosphorylation of moesin is triggered via ROCK and p38 MAPK activation.
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Affiliation(s)
- Lingjun Wang
- Department of Pathophysiology, Key Lab for Shock and Microcirculation Research, Southern Medical University, Tonghe, Guangzhou, People's Republic of China
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3
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Zawawi KH, Kantarci A, Schulze-Späte U, Fujita T, Batista EL, Amar S, Van Dyke TE. Moesin-induced signaling in response to lipopolysaccharide in macrophages. J Periodontal Res 2010; 45:589-601. [PMID: 20546116 DOI: 10.1111/j.1600-0765.2010.01271.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND OBJECTIVE Many physiological and pathophysiological conditions are attributable in part to cytoskeletal regulation of cellular responses to signals. Moesin (membrane-organizing extension spike protein), an ERM (ezrin, radixin and moesin) family member, is involved in lipopolysaccharide (LPS)-mediated events in mononuclear phagocytes; however, its role in signaling is not fully understood. The aim of this study was to investigate the LPS-induced moesin signaling pathways in macrophages. MATERIAL AND METHODS Macrophages were stimulated with 500 ng/mL LPS in macrophage serum-free medium. For blocking experiments, cells were pre-incubated with anti-moesin antibody. Moesin total protein and phosphorylation were studied with western blotting. Moesin mRNA was assessed using quantitative real-time PCR. To explore binding of moesin to LPS, native polyacrylamide gel electrophoresis (PAGE) gel shift assay was performed. Moesin immunoprecipitation with CD14, MD-2 and Toll-like receptor 4 (TLR4) and co-immunoprecipitation of MyD88-interleukin-1 receptor-associated kinase (IRAK) and IRAK-tumor necrosis factor receptor-activated factor 6 (TRAF6) were analyzed. Phosphorylation of IRAK and activities of MAPK, nuclear factor kappaB (NF-kappaB) and IkappaBalpha were studied. Tumor necrosis factor alpha, interleukin-1beta and interferon beta were measured by ELISA. RESULTS Moesin was identified as part of a protein cluster that facilitates LPS recognition and results in the expression of proinflammatory cytokines. Lipopolysaccharide stimulates moesin expression and phosphorylation by binding directly to the moesin carboxyl-terminus. Moesin is temporally associated with TLR4 and MD-2 after LPS stimulation, while CD14 is continuously bound to moesin. Lipopolysaccharide-induced signaling is transferred downstream to p38, p44/42 MAPK and NF-kappaB activation. Blockage of moesin function interrupts the LPS response through an inhibition of MyD88, IRAK and TRAF6, negatively affecting subsequent activation of the MAP kinases (p38 and ERK), NF-kappaB activation and translocation to the nucleus. CONCLUSION These results suggest an important role for moesin in the innate immune response and TLR4-mediated pattern recognition in periodontal disease.
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Affiliation(s)
- K H Zawawi
- Department of Preventive Dental Science, Division of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
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Takamatsu H, Espinoza JL, Lu X, Qi Z, Okawa K, Nakao S. Anti-Moesin Antibodies in the Serum of Patients with Aplastic Anemia Stimulate Peripheral Blood Mononuclear Cells to Secrete TNF-α and IFN-γ. THE JOURNAL OF IMMUNOLOGY 2008; 182:703-10. [DOI: 10.4049/jimmunol.182.1.703] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Zhang M, Wang Y, Middleton FA, Horton JA, Farnum CE, Damron TA. Growth plate zonal microarray analysis shows upregulation of extracellular matrix genes and downregulation of metalloproteinases and cathepsins following irradiation. Calcif Tissue Int 2007; 81:26-38. [PMID: 17549535 DOI: 10.1007/s00223-007-9025-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2006] [Accepted: 02/18/2007] [Indexed: 10/23/2022]
Abstract
Although the growth plate matrix area fraction increases after irradiation, extracellular matrix (ECM) gene expression in this context has not been studied. The hypothesis was that normally expressed ECM genes would be upregulated after irradiation. The right limbs of six Sprague-Dawley 5-week-old rats were irradiated with the left limbs as controls. Half of the animals were harvested after 1 week and half after 2. Microarray was conducted from normal and irradiated tibial growth plate proliferative zone (PZ) and hypertrophic zone (HZ) chondrocytes separated by laser microdissection at each time point. In situ hybridization (ISH) and real-time polymerase chain reaction (PCR) were used to confirm expression of selected genes. At 1 and 2 weeks after irradiation, both normally expressed ECM genes and others not highly expressed in the normal growth plate showed upregulation. Metalloproteinases and cathepsins were downregulated. PZ gene expression after irradiation exhibited features of the normal HZ, suggesting premature terminal differentiation. ECM genes not highly expressed in the normal growth plate included several members of the small leucine-rich proteins and the ezrin-radixin-moesin family. The effects of irradiation on cathepsin K (Ctsk), integrin binding sialoprotein (Ibsp), and procollagen II alpha 1 (Col2a1), as determined by ISH and real-time PCR, were highly correlated with the microarray results. Accumulation of matrix following radiation injury to the growth plate correlated well with changes in gene expression. Upregulation of genes not normally highly expressed in the noninjured growth plate suggests their importance in the injury and repair response.
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Affiliation(s)
- Mingliang Zhang
- Musculoskeletal Sciences Research Laboratory, Department of Orthopedic Surgery, State University of New York Upstate Medical University, Suite 130, 550 Harrison Street, Syracuse, NY 13210, USA
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Takamatsu H, Feng X, Chuhjo T, Lu X, Sugimori C, Okawa K, Yamamoto M, Iseki S, Nakao S. Specific antibodies to moesin, a membrane-cytoskeleton linker protein, are frequently detected in patients with acquired aplastic anemia. Blood 2006; 109:2514-20. [PMID: 17110458 DOI: 10.1182/blood-2006-07-036715] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Abstract
To identify novel autoantibodies in acquired aplastic anemia (AA), we screened the sera of patients with AA possessing small populations of paroxysmal nocturnal hemoglobinuria (PNH)–type cells for the presence of antibodies (Abs) which recognize proteins derived from a leukemia cell line, UT-7. Immunoblotting using proteins derived from lysates or culture supernatants of UT-7 cells revealed the presence of IgG Abs specific to an 80-kDa protein. Peptide mass fingerprinting identified this 80-kDa protein as moesin. Enzyme-linked immunosorbent assay (ELISA) using recombinant moesin showed high titers of antimoesin Abs in 25 (37%) of 67 patients with AA. Moesin was secreted from several myeloid leukemia cell lines other than UT-7, such as OUN-1 and K562, as an exosomal protein. The presence of antimoesin Abs was significantly correlated with the presence of PNH-type cells and antidiazepam-binding inhibitor-related protein-1 (DRS-1) Abs. Patients with AA that did not show any of these 3 markers tended to respond poorly to immunosuppressive therapy. These findings suggest that a B-cell response to moesin, possibly derived from hematopoietic cells, frequently occurs in patients with AA and that detection of antimoesin Abs in combination with other markers may be useful in diagnosing immune pathophysiology in patients with AA.
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Affiliation(s)
- Hiroyuki Takamatsu
- Cellular Transplantation Biology, Division of Cancer Medicine, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan
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Iontcheva I, Amar S, Zawawi KH, Kantarci A, Van Dyke TE. Role for moesin in lipopolysaccharide-stimulated signal transduction. Infect Immun 2004; 72:2312-20. [PMID: 15039356 PMCID: PMC375212 DOI: 10.1128/iai.72.4.2312-2320.2004] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Moesin is a 78-kDa protein with diverse functions in linking the cytoskeleton to the membrane while controlling cell shape, adhesion, locomotion, and signaling. The aim of this study was to characterize the expression and localization of moesin in mononuclear phagocytes by using confocal microscopy, flow cytometry, immunoprecipitation, and Western blotting and to analyze the function of moesin as a lipopolysaccharide receptor, utilizing an antisense oligonucleotide approach to knock down the moesin gene. Results revealed that moesin is expressed on the surface of monocytes/macrophages and surface expression is increased after lipopolysaccharide stimulation. The total protein mass of moesin is increased in monocytes after lipopolysaccharide stimulation. Immunoprecipitation showed that moesin coprecipitates with TLR4, a well-known lipopolysaccharide receptor, suggesting an early role of moesin in the formation of the initiation complex for lipopolysaccharide signaling. Two antisense and two control sense oligonucleotides were synthesized and introduced every 4 h for 48 h in adherent macrophage-like cells. Cells were then stimulated with lipopolysaccharide for 4 h, and the supernatants were assayed for tumor necrosis factor alpha (TNF-alpha) production. Cell lysates were assayed for moesin expression by Western blotting immediately after the 48-h treatment period and also after 116 h of recovery to assess the return of moesin expression and function. Moesin gene expression was completely suppressed after 48 h of incubation with antisense oligonucleotides. The antisense elimination of moesin gene expression led to a significant reduction of lipopolysaccharide-induced TNF-alpha secretion. Restoration of moesin gene expression led to restoration of TNF-alpha production. These data suggest an important role for moesin in lipopolysaccharide-induced TNF-alpha production, highlighting its importance in lipopolysaccharide-mediated signal transduction.
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Affiliation(s)
- Iveta Iontcheva
- Department of Periodontology and Oral Biology, Boston University Goldman School of Dental Medicine, Boston, Massachusetts 02118, USA
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8
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Wang D, Jensen R, Gendeh G, Williams K, Pallavicini MG. Proteome and Transcriptome Analysis of Retinoic Acid-Induced Differentiation of Human Acute Promyelocytic Leukemia Cells, NB4. J Proteome Res 2004; 3:627-35. [PMID: 15253446 DOI: 10.1021/pr049976r] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Acute promyelocytic leukemia (APL) is characterized by a translocation t(15:17) that fuses the retinoic acid receptor gene with the promyelocytic gene, which blocks differentiation to normal granulocytes. NB4 cells, derived from human acute promyelocytic leukemia, display this genotype and phenotype. All trans-retinoic acid (ATRA) induces differentiation of NB4 cell cultures in vitro and APL in vivo, although resistance to differentiation therapy frequently develops. To identify genes involved in differentiation, we compared gene expression at the mRNA and protein levels using microarray analyses and two-dimensional (2D) difference gel electrophoresis (DIGE), plus MALDI-TOF-TOF mass spectrometry. Differentially expressed transcripts were identified using oligonucleotide-based microarrays with targets representing almost 14 000 genes. Real time PCR was performed on a subset of genes whose products were shown to be differentially expressed using proteomic and/or genomic approaches. Our analyses identified 46 genes that were differentially expressed in NB4 +/- ATRA; 22 were identified using 2D-DIGE and 24 using microarray analysis. All but four of these genes were expressed at higher levels in differentiated cells, and several controlled cell structure (internal and cytoskelatal) or signal transduction. We observed that proteome analysis with DIGE and silver-stained 2D gel electrophoresis analyses revealed significant differences between the two measurement approaches. Furthermore, our data showed significant discordance between gene expression at the protein and transcript levels.
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MESH Headings
- Cell Differentiation/drug effects
- Cell Differentiation/physiology
- Electrophoresis, Gel, Two-Dimensional
- Gene Expression Profiling
- Gene Expression Regulation, Neoplastic/drug effects
- Granulocytes/cytology
- Granulocytes/drug effects
- Granulocytes/metabolism
- Humans
- Leukemia, Promyelocytic, Acute/metabolism
- Proteome
- RNA, Messenger/genetics
- Receptors, Retinoic Acid/metabolism
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
- Tretinoin/pharmacology
- Tumor Cells, Cultured
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Affiliation(s)
- Daojing Wang
- Comprehensive Cancer Center, University of California, San Francisco, 94143, USA
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Kobayashi H, Sagara J, Kurita H, Morifuji M, Ohishi M, Kurashina K, Taniguchi S. Clinical Significance of Cellular Distribution of Moesin in Patients with Oral Squamous Cell Carcinoma. Clin Cancer Res 2004; 10:572-80. [PMID: 14760079 DOI: 10.1158/1078-0432.ccr-1323-03] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Moesin is a linking protein of the submembraneous cytoskeleton and plays a key role in the control of cell morphology, adhesion, and motility. The aim of the present study was to elucidate the clinical significance of expression patterns of moesin in patients with oral squamous cell carcinoma (OSCC). EXPERIMENTAL DESIGN Immunohistochemistry for moesin monoclonal antibody was performed on 103 paraffin-embedded specimens from patients with primary OSCC, including 30 patients with locoregional lymph node metastasis, and in the sections from nude mice transplanted with two cell lines derived from a single human tongue cancer (SQUU-A and SQUU-B). RESULTS Expression patterns of moesin in OSCCs were divided into three groups: membranous pattern; mixed pattern; and cytoplasmic pattern. These expression patterns correlated with tumor size, lymph node metastasis, mode of invasion, differentiation, and lymphocytic infiltration. In about two-thirds of the patients with metastatic lymph node, homogeneous cytoplasmic expression was detected in the metastatic lymph nodes. In addition, SQUU-B with high metastatic potential showed more reduced levels of membrane-bound moesin than SQUU-A with low metastatic potential. A multivariate analysis demonstrated that expression patterns of moesin can be an independent prognostic factor. CONCLUSIONS Our results suggest that moesin expression contributed to discriminating between patients with the potentiality for locoregional lymph node metastasis and those with a better prognosis and might improve the definition of suitable therapy for each.
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Affiliation(s)
- Hiroichi Kobayashi
- Department of Dentistry and Oral Surgery, Shinshu University School of Medicine, Asahi, Matsumoto, Japan.
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10
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Kobayashi H, Sagara J, Masumoto J, Kurita H, Kurashina K, Taniguchi S. Shifts in cellular localization of moesin in normal oral epithelium, oral epithelial dysplasia, verrucous carcinoma and oral squamous cell carcinoma. J Oral Pathol Med 2003; 32:344-9. [PMID: 12787041 DOI: 10.1034/j.1600-0714.2003.00111.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
BACKGROUND Moesin, a member of ERM (ezrin/radixin/moesin) family, links actin filaments of cell surface structure to the cell membrane. The purpose of the study is to assess the shifts in cellular distribution of moesin in normal oral epithelium, oral epithelial dysplasia (OED), verrucous carcinoma (VC), and oral squamous cell carcinoma (OSCC). METHODS The expression of moesin was evaluated immunohistochemically in paraffin-embedded tissues of 59 specimens of OSCC, 35 specimens of OED, 17 specimens of VC, and five specimens of normal oral epithelium. RESULTS In the normal oral epithelia, all specimens showed a pattern of membranous expression against the anti-moesin antibody in the basal layer cells. In the OED specimens, moesin was dominantly expressed in the cell membrane except for the cornified layer. In VC and OSCC specimens, almost the whole of the carcinoma cells were stained with anti-moesin antibody. However, in OSCC samples, moesin was markedly expressed increasingly in the cytoplasm and decreasingly in the cell membrane, as compared with OED and VC. In addition, there was a significant correlation between the pattern of moesin expression and tumor differentiation in OSCC. CONCLUSIONS Our results suggest that it is useful to detect the moesin expression as adjunct to screening mucosal lesions in the oral cavity.
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Affiliation(s)
- Hiroichi Kobayashi
- Department of Dentistry and Oral Surgery, Research Center on Aging and Adaptation, Shinshu University School of Medicine, Asahi 3-11, Matsumoto 390-8621, Japan.
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Tort F, Pinyol M, Pulford K, Roncador G, Hernandez L, Nayach I, Kluin-Nelemans HC, Kluin P, Touriol C, Delsol G, Mason D, Campo E. Molecular characterization of a new ALK translocation involving moesin (MSN-ALK) in anaplastic large cell lymphoma. J Transl Med 2001; 81:419-26. [PMID: 11310834 DOI: 10.1038/labinvest.3780249] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
The majority of anaplastic large cell lymphomas (ALCL) are associated with chromosomal abnormalities affecting the anaplastic lymphoma kinase (ALK) gene which result in the expression of hybrid ALK fusion proteins in the tumor cells. In most of these tumors, the hybrid gene comprises the 5' region of nucleophosmin (NPM) fused in frame to the 3' portion of ALK, resulting in the expression of the chimeric oncogenic tyrosine kinase NPM-ALK. However, other variant rearrangements have been described in which ALK fuses to a partner other than NPM. Here we have identified the moesin (MSN) gene at Xq11-12 as a new partner of ALK in a case of ALCL which exhibited a distinctive membrane-restricted pattern of ALK labeling. The hybrid MSN-ALK protein had a molecular weight of 125 kd and contained an active tyrosine kinase domain. The unique membrane staining pattern of ALK is presumed to reflect association of moesin with cell membrane proteins. In contrast to other translocations involving the ALK gene, the ALK breakpoint in this case occurred within the exonic sequence coding for the juxtamembrane portion of ALK. Identification of the genomic breakpoint confirmed the in-frame fusion of the whole MSN intron 10 to a 17 bp shorter juxtamembrane exon of ALK. The breakpoint in der(2) chromosome showed a deletion, including 30 bp of ALK and 36 bp of MSN genes. These findings indicate that MSN may act as an alternative fusion partner for activation of ALK in ALCL and provide further evidence that oncogenic activation of ALK may occur at different intracellular locations.
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Affiliation(s)
- F Tort
- Laboratory of Pathology, Hospital Clinic, Institut d'Investigacions Biomediques August Pi i Sunyer, University of Barcelona, Spain
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Masumoto J, Taniguchi S, Sagara J. Pyrin N-terminal homology domain- and caspase recruitment domain-dependent oligomerization of ASC. Biochem Biophys Res Commun 2001; 280:652-5. [PMID: 11162571 DOI: 10.1006/bbrc.2000.4190] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ASC was first identified as a caspase recruitment domain (CARD)-containing proapoptotic molecule that forms insoluble aggregates during apoptosis. Here, we report both the pyrin N-terminal homology domain (PYD) and CARD domains are involved in the aggregation of ASC. Preliminary experiments indicated that overexpression of ASC formed filament-like aggregates in COS-7 cells. Expression experiments using green fluorescent protein (GFP) constructs showed that not only the GFP-ASC-CARD but also the GFP-ASC-PYD formed filament-like aggregates in COS-7 cells. We confirmed these filament-like aggregates of both the ASC-PYD and the ASC-CARD due to homophilic interaction by immunoprecipitation method. We also demonstrated that the ASC-PYD associated with the ASC-CARD by heterophilic interaction. These observations suggest that the dimerization of the PYD as well as the CARD plays an important role in the oligomerization of ASC as an adaptor molecule.
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Affiliation(s)
- J Masumoto
- Department of Molecular Oncology and Angiology, Research Center on Aging and Adaptation, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Nagano, Japan
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Masumoto J, Taniguchi S, Nakayama K, Ayukawa K, Sagara J. Murine ortholog of ASC, a CARD-containing protein, self-associates and exhibits restricted distribution in developing mouse embryos. Exp Cell Res 2001; 262:128-33. [PMID: 11139337 DOI: 10.1006/excr.2000.5078] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ASC (apoptosis-associated speck-like protein containing a CARD) was first identified as a cytosolic soluble protein that forms insoluble aggregates and enhances etoposide-induced apoptosis. We have cloned a murine ortholog of ASC (mASC) comprising 193 amino acids with a well-conserved pyrin N-terminal homology domain and caspase recruitment domain (CARD). mASC fused with green fluorescent protein appeared as a speck in transfected COS-7 cells and showed self-association. We analyzed mASC gene expression in developing embryos by in situ hybridization and found it to have a restricted distribution in mouse embryos. At E9.5, mASC was strongly expressed in the telencephalon, thalamic areas of the diencephalon, heart, and liver. Northern blotting analysis revealed that the mASC gene was expressed ubiquitously in multiple organs in adult mice. These findings indicate that mASC shows conservation of not only the primary structure of human ASC but also the ability to aggregate and has some similarity in its distribution to other CARD-containing molecules, including the apoptosis regulator Apaf-1.
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Affiliation(s)
- J Masumoto
- Department of Molecular Oncology and Angiology, Second Department of Anatomy, Research Center on Aging and Adaptation, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto, Nagano, 390-8621, Japan
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14
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Masumoto J, Taniguchi S, Ayukawa K, Sarvotham H, Kishino T, Niikawa N, Hidaka E, Katsuyama T, Higuchi T, Sagara J. ASC, a novel 22-kDa protein, aggregates during apoptosis of human promyelocytic leukemia HL-60 cells. J Biol Chem 1999; 274:33835-8. [PMID: 10567338 DOI: 10.1074/jbc.274.48.33835] [Citation(s) in RCA: 412] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The cytoskeletal and/or nuclear matrix molecules responsible for morphological changes associated with apoptosis were identified using monoclonal antibodies (mAbs). We developed mAbs against Triton X-100-insoluble components of HL-60 cells pretreated with all-trans retinoic acid. In particular, one mAb recognized a 22-kDa protein that exhibited intriguing behavior by forming an aggregate and appearing as a speck during apoptosis induced by retinoic acid and other anti-tumor drugs. Cloning and sequencing of its cDNA revealed that this protein comprises 195 amino acids and that its C-terminal half has a caspase recruitment domain (CARD) motif, characteristic of numerous proteins involved in apoptotic signaling. We referred to this protein as ASC (apoptosis-associated speck-like protein containing a CARD). The ASC gene was mapped on chromosome 16p11.2-12. The antisense oligonucleotides of ASC were found to reduce the expression of ASC, and consequently, etoposide-mediated apoptosis of HL-60 cells was suppressed. Our results indicate that ASC is a novel member of the CARD-containing adaptor protein family.
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MESH Headings
- Amino Acid Sequence
- Animals
- Apoptosis
- Base Sequence
- CARD Signaling Adaptor Proteins
- COS Cells
- Caspases/metabolism
- Chromosome Mapping
- Chromosomes, Human, Pair 16/genetics
- Cloning, Molecular
- Cytoskeletal Proteins/chemistry
- Cytoskeletal Proteins/genetics
- Cytoskeletal Proteins/metabolism
- DNA Fragmentation
- DNA, Complementary/chemistry
- DNA, Complementary/genetics
- Female
- Gene Expression
- HL-60 Cells/metabolism
- HL-60 Cells/ultrastructure
- HeLa Cells
- Humans
- In Situ Nick-End Labeling
- Jurkat Cells
- K562 Cells
- Leukemia, Promyelocytic, Acute/metabolism
- Leukemia, Promyelocytic, Acute/pathology
- Molecular Sequence Data
- Molecular Weight
- Protein Structure, Tertiary
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Recombinant Fusion Proteins/genetics
- Sequence Alignment
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Tissue Distribution
- Tumor Cells, Cultured
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Affiliation(s)
- J Masumoto
- Department of Molecular Oncology, Research Center on Aging and Adaptation, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Nagano, Japan
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