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Arbildi P, Calvo F, Macías V, Rodríguez-Camejo C, Sóñora C, Hernández A. Study of tissue transglutaminase spliced variants expressed in THP-1 derived macrophages exhibiting distinct functional phenotypes. Immunobiology 2023; 228:152752. [PMID: 37813017 DOI: 10.1016/j.imbio.2023.152752] [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: 06/02/2023] [Revised: 09/21/2023] [Accepted: 09/30/2023] [Indexed: 10/11/2023]
Abstract
Tissue transglutaminase (TG2) expressed in monocytes and macrophage is known to participate in processes during either early and resolution stages of inflammation. The alternative splicing of tissue transglutaminase gene is a mechanism that increases its functional diversity. Four spliced variants are known with truncated C-terminal domains (TGM2_v2, TGM2_v3, TGM2_v4a, TGM2_v4b) but scarce information is available about its expression in human monocyte and macrophages. We studied the expression of canonical TG2 (TGM2_v1) and its short spliced variants by RT-PCR during differentiation of TPH-1 derived macrophages (dTHP-1) using two protocols (condition I and II) that differ in Phorbol-12-myristate-13-acetate dose and time schedule. The production of TNF-α and IL-1β in supernatant of dTHP-1, measured by ELISA in supernatants showed higher proinflammatory milieu in condition I. We found that the expression of all mRNA TG2 spliced variants were up-regulated during macrophage differentiation and after IFN-γ treatment of dTHP-1 cells in both conditions. Nevertheless, the relative fold increase or TGM2_v3 in relation with TGM2_v1 was higher only with the condition I. M1/M2-like THP-1 macrophages obtained with IFN-γ/IL-4 treatments showed that the up-regulation of TGM2_v1 induced by IL-4 was higher in relation with any short spliced variants. The qualitative profile of relative contribution of spliced variants in M1/M2-like THP-1 cells showed a trend to higher expression of TGM2_v3 in the inflammatory functional phenotype. Our results contribute to the knowledge about TG2 spliced variants in the biology of monocyte/macrophage cells and show how the differentiation conditions can alter their expression and cell function.
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Affiliation(s)
- Paula Arbildi
- Unidad Asociada de Inmunología, Instituto de Química Biológica (IQB), Facultad de Ciencias, Universidad de la República, Iguá 4225, Montevideo 11400, Uruguay; Area Inmunología, Departamento de Biociencias (DEPBIO), Facultad de Química, Universidad de la República, General Flores 2124, Montevideo 11800, Uruguay; Laboratorio de Inmunología, Instituto de Higiene "Prof. Arnoldo Berta", Universidad de la República, Alfredo Navarro 3051, Montevideo 11600, Uruguay.
| | - Federico Calvo
- Unidad Asociada de Inmunología, Instituto de Química Biológica (IQB), Facultad de Ciencias, Universidad de la República, Iguá 4225, Montevideo 11400, Uruguay; Area Inmunología, Departamento de Biociencias (DEPBIO), Facultad de Química, Universidad de la República, General Flores 2124, Montevideo 11800, Uruguay; Laboratorio de Inmunología, Instituto de Higiene "Prof. Arnoldo Berta", Universidad de la República, Alfredo Navarro 3051, Montevideo 11600, Uruguay
| | - Victoria Macías
- Unidad Asociada de Inmunología, Instituto de Química Biológica (IQB), Facultad de Ciencias, Universidad de la República, Iguá 4225, Montevideo 11400, Uruguay; Area Inmunología, Departamento de Biociencias (DEPBIO), Facultad de Química, Universidad de la República, General Flores 2124, Montevideo 11800, Uruguay; Laboratorio de Inmunología, Instituto de Higiene "Prof. Arnoldo Berta", Universidad de la República, Alfredo Navarro 3051, Montevideo 11600, Uruguay
| | - Claudio Rodríguez-Camejo
- Unidad Asociada de Inmunología, Instituto de Química Biológica (IQB), Facultad de Ciencias, Universidad de la República, Iguá 4225, Montevideo 11400, Uruguay; Area Inmunología, Departamento de Biociencias (DEPBIO), Facultad de Química, Universidad de la República, General Flores 2124, Montevideo 11800, Uruguay; Laboratorio de Inmunología, Instituto de Higiene "Prof. Arnoldo Berta", Universidad de la República, Alfredo Navarro 3051, Montevideo 11600, Uruguay.
| | - Cecilia Sóñora
- Unidad Asociada de Inmunología, Instituto de Química Biológica (IQB), Facultad de Ciencias, Universidad de la República, Iguá 4225, Montevideo 11400, Uruguay; Area Inmunología, Departamento de Biociencias (DEPBIO), Facultad de Química, Universidad de la República, General Flores 2124, Montevideo 11800, Uruguay; Laboratorio de Inmunología, Instituto de Higiene "Prof. Arnoldo Berta", Universidad de la República, Alfredo Navarro 3051, Montevideo 11600, Uruguay; Escuela Universitaria de Tecnología Médica (EUTM), Facultad de Medicina, Universidad de la República, Alfredo Navarro S/N, Montevideo 11600, Uruguay.
| | - Ana Hernández
- Unidad Asociada de Inmunología, Instituto de Química Biológica (IQB), Facultad de Ciencias, Universidad de la República, Iguá 4225, Montevideo 11400, Uruguay; Area Inmunología, Departamento de Biociencias (DEPBIO), Facultad de Química, Universidad de la República, General Flores 2124, Montevideo 11800, Uruguay; Laboratorio de Inmunología, Instituto de Higiene "Prof. Arnoldo Berta", Universidad de la República, Alfredo Navarro 3051, Montevideo 11600, Uruguay.
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Tissue transglutaminase exacerbates renal fibrosis via alternative activation of monocyte-derived macrophages. Cell Death Dis 2023; 14:136. [PMID: 36864028 PMCID: PMC9981766 DOI: 10.1038/s41419-023-05622-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 01/24/2023] [Accepted: 01/25/2023] [Indexed: 03/04/2023]
Abstract
Macrophages are important components in modulating homeostatic and inflammatory responses and are generally categorized into two broad but distinct subsets: classical activated (M1) and alternatively activated (M2) depending on the microenvironment. Fibrosis is a chronic inflammatory disease exacerbated by M2 macrophages, although the detailed mechanism by which M2 macrophage polarization is regulated remains unclear. These polarization mechanisms have little in common between mice and humans, making it difficult to adapt research results obtained in mice to human diseases. Tissue transglutaminase (TG2) is a known marker common to mouse and human M2 macrophages and is a multifunctional enzyme responsible for crosslinking reactions. Here we sought to identify the role of TG2 in macrophage polarization and fibrosis. In IL-4-treated macrophages derived from mouse bone marrow and human monocyte cells, the expression of TG2 was increased with enhancement of M2 macrophage markers, whereas knockout or inhibitor treatment of TG2 markedly suppressed M2 macrophage polarization. In the renal fibrosis model, accumulation of M2 macrophages in fibrotic kidney was significantly reduced in TG2 knockout or inhibitor-administrated mice, along with the resolution of fibrosis. Bone marrow transplantation using TG2-knockout mice revealed that TG2 is involved in M2 polarization of infiltrating macrophages derived from circulating monocytes and exacerbates renal fibrosis. Furthermore, the suppression of renal fibrosis in TG2-knockout mice was abolished by transplantation of wild-type bone marrow or by renal subcapsular injection of IL4-treated macrophages derived from bone marrow of wild-type, but not TG2 knockout. Transcriptome analysis of downstream targets involved in M2 macrophages polarization revealed that ALOX15 expression was enhanced by TG2 activation and promoted M2 macrophage polarization. Furthermore, the increase in the abundance of ALOX15-expressing macrophages in fibrotic kidney was dramatically suppressed in TG2-knockout mice. These findings demonstrated that TG2 activity exacerbates renal fibrosis by polarization of M2 macrophages from monocytes via ALOX15.
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Somodi L, Horváth E, Bárdos H, Baráth B, Pethő D, Katona É, Balla J, Mutch NJ, Muszbek L. Cellular FXIII in Human Macrophage-Derived Foam Cells. Int J Mol Sci 2023; 24:4802. [PMID: 36902231 PMCID: PMC10002485 DOI: 10.3390/ijms24054802] [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: 01/30/2023] [Revised: 02/24/2023] [Accepted: 03/01/2023] [Indexed: 03/06/2023] Open
Abstract
Macrophages express the A subunit of coagulation factor XIII (FXIII-A), a transglutaminase which cross-links proteins through Nε-(γ-L-glutamyl)-L-lysyl iso-peptide bonds. Macrophages are major cellular constituents of the atherosclerotic plaque; they may stabilize the plaque by cross-linking structural proteins and they may become transformed into foam cells by accumulating oxidized LDL (oxLDL). The combination of oxLDL staining by Oil Red O and immunofluorescent staining for FXIII-A demonstrated that FXIII-A is retained during the transformation of cultured human macrophages into foam cells. ELISA and Western blotting techniques revealed that the transformation of macrophages into foam cells elevated the intracellular FXIII-A content. This phenomenon seems specific for macrophage-derived foam cells; the transformation of vascular smooth muscle cells into foam cells fails to induce a similar effect. FXIII-A containing macrophages are abundant in the atherosclerotic plaque and FXIII-A is also present in the extracellular compartment. The protein cross-linking activity of FXIII-A in the plaque was demonstrated using an antibody labeling the iso-peptide bonds. Cells showing combined staining for FXIII-A and oxLDL in tissue sections demonstrated that FXIII-A-containing macrophages within the atherosclerotic plaque are also transformed into foam cells. Such cells may contribute to the formation of lipid core and the plaque structurization.
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Affiliation(s)
- Laura Somodi
- Division of Clinical Laboratory Science, Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, 98 Nagyerdei krt, 4032 Debrecen, Hungary
- Kálmán Laki Doctoral School of Biomedical and Clinical Sciences, University of Debrecen, 98 Nagyerdei krt, 4032 Debrecen, Hungary
| | - Emőke Horváth
- Pathology Service, County Emergency Clinical Hospital of Targu Mures, 50 Gheorghe Marinescu Street, 540136 Targu Mures, Romania
- Department of Pathology, Faculty of Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 38 Gheorghe Marinescu Street, 540142 Targu Mures, Romania
| | - Helga Bárdos
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, 26 Kassai út, 4028 Debrecen, Hungary
| | - Barbara Baráth
- Division of Clinical Laboratory Science, Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, 98 Nagyerdei krt, 4032 Debrecen, Hungary
| | - Dávid Pethő
- Kálmán Laki Doctoral School of Biomedical and Clinical Sciences, University of Debrecen, 98 Nagyerdei krt, 4032 Debrecen, Hungary
- Division of Nephrology, Department of Medicine, Faculty of Medicine, University of Debrecen, 98 Nagyerdei krt, 4032 Debrecen, Hungary
| | - Éva Katona
- Division of Clinical Laboratory Science, Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, 98 Nagyerdei krt, 4032 Debrecen, Hungary
| | - József Balla
- Division of Nephrology, Department of Medicine, Faculty of Medicine, University of Debrecen, 98 Nagyerdei krt, 4032 Debrecen, Hungary
- ELKH-UD Vascular Pathophysiology Research Group 11003, University of Debrecen, 4032 Debrecen, Hungary
| | - Nicola J. Mutch
- Aberdeen Cardiovascular and Diabetes Centre, Institute of Medical Sciences, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen AB25 2ZD, UK
| | - László Muszbek
- Division of Clinical Laboratory Science, Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, 98 Nagyerdei krt, 4032 Debrecen, Hungary
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Al-U’datt DGF, Tranchant CC, Al-Husein B, Hiram R, Al-Dwairi A, AlQudah M, Al-shboul O, Jaradat S, Alqbelat J, Almajwal A. Involvement and possible role of transglutaminases 1 and 2 in mediating fibrotic signalling, collagen cross-linking and cell proliferation in neonatal rat ventricular fibroblasts. PLoS One 2023; 18:e0281320. [PMID: 36848364 PMCID: PMC9970086 DOI: 10.1371/journal.pone.0281320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 01/19/2023] [Indexed: 03/01/2023] Open
Abstract
Transglutaminase (TG) isoforms control diverse normal and pathophysiologic processes through their capacity to cross-link extracellular matrix (ECM) proteins. Their functional and signalling roles in cardiac fibrosis remain poorly understood, despite some evidence of TG2 involvement in abnormal ECM remodelling in heart diseases. In this study, we investigated the role of TG1 and TG2 in mediating fibrotic signalling, collagen cross-linking, and cell proliferation in healthy fibroblasts by siRNA-mediated knockdown. siRNA for TG1, TG2 or negative control was transfected into cultured neonatal rat ventricular fibroblasts and cardiomyocytes. mRNA expression of TGs and profibrotic, proliferation and apoptotic markers was assessed by qPCR. Cell proliferation and soluble and insoluble collagen were determined by ELISA and LC-MS/MS, respectively. TG1 and TG2 were both expressed in neonatal rat cardiomyocytes and fibroblasts before transfection. Other TGs were not detected before and after transfection. TG2 was predominantly expressed and more effectively silenced than TG1. Knocking down TG1 or TG2 significantly modified profibrotic markers mRNA expression in fibroblasts, decreasing connective tissue growth factor (CTGF) and increasing transforming growth factor-β1 compared to the negative siRNA control. Reduced expression of collagen 3A1 was found upon TG1 knockdown, while TG2 knockdown raised α-smooth muscle actin expression. TG2 knockdown further increased fibroblast proliferation and the expression of proliferation marker cyclin D1. Lower insoluble collagen content and collagen cross-linking were evidenced upon silencing TG1 or TG2. Transcript levels of collagen 1A1, fibronectin 1, matrix metalloproteinase-2, cyclin E2, and BCL-2-associated X protein/B-cell lymphoma 2 ratio were strongly correlated with TG1 mRNA expression, whereas TG2 expression correlated strongly with CTGF mRNA abundance. These findings support a functional and signalling role for TG1 and TG2 from fibroblasts in regulating key processes underlying myocardial ECM homeostasis and dysregulation, suggesting that these isoforms could be potential and promising targets for the development of cardiac fibrosis therapies.
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Affiliation(s)
- Doa’a G. F. Al-U’datt
- Department of Physiology and Biochemistry, Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan
| | - Carole C. Tranchant
- School of Food Science, Nutrition and Family Studies, Faculty of Health Sciences and Community Services, Université de Moncton, New Brunswick, Canada
| | - Belal Al-Husein
- Department of Clinical Pharmacy, Faculty of Pharmacy, Jordan University of Science and Technology, Irbid, Jordan
| | - Roddy Hiram
- Montreal Heart Institute, Université de Montréal, Montreal, Quebec, Canada
- Department of Medicine, Université de Montréal, Montreal, Quebec, Canada
| | - Ahmed Al-Dwairi
- Department of Physiology and Biochemistry, Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan
| | - Mohammad AlQudah
- Department of Physiology and Biochemistry, Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan
- Physiology Department, Arabian Gulf University, Manama, Bahrain
| | - Othman Al-shboul
- Department of Physiology and Biochemistry, Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan
| | - Saied Jaradat
- Princess Haya Biotechnology Center, Jordan University of Science and Technology, Irbid, Jordan
| | - Jenan Alqbelat
- Department of Physiology and Biochemistry, Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan
| | - Ali Almajwal
- Department of Community Health Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
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Fisk HL, Childs CE, Miles EA, Ayres R, Noakes PS, Paras-Chavez C, Kuda O, Kopecký J, Antoun E, Lillycrop KA, Calder PC. Modification of subcutaneous white adipose tissue inflammation by omega-3 fatty acids is limited in human obesity-a double blind, randomised clinical trial. EBioMedicine 2022; 77:103909. [PMID: 35247847 PMCID: PMC8894262 DOI: 10.1016/j.ebiom.2022.103909] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 02/01/2022] [Accepted: 02/16/2022] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Obesity is associated with enhanced inflammation. However, investigation in human subcutaneous white adipose tissue (scWAT) is limited and the mechanisms by which inflammation occurs have not been well elucidated. Marine long chain omega-3 polyunsaturated fatty acids (LC n-3 PUFAs) have anti-inflammatory actions and may reduce scWAT inflammation. METHODS Subcutaneous white adipose tissue (scWAT) biopsies were collected from individuals living with obesity (n=45) and normal weight individuals (n=39) prior to and following a 12-week intervention with either 3 g/day of a fish oil concentrate (providing 1.1 g eicosapentaenoic acid (EPA) + 0.8 g docosahexaenoic acid (DHA)) or 3 g/day of corn oil. ScWAT fatty acid, oxylipin, and transcriptome profiles were assessed by gas chromatography, ultra-pure liquid chromatography tandem mass spectrometry, RNA sequencing and qRT-PCR, respectively. FINDINGS Obesity was associated with greater scWAT inflammation demonstrated by lower concentrations of specialised pro-resolving mediators (SPMs) and hydroxy-DHA metabolites and an altered transcriptome with differential expression of genes involved in LC n-3 PUFA activation, oxylipin synthesis, inflammation, and immune response. Intervention with LC n-3 PUFAs increased their respective metabolites including the SPM precursor 14-hydroxy-DHA in normal weight individuals and decreased arachidonic acid derived metabolites and expression of genes involved in immune and inflammatory response with a greater effect in normal weight individuals. INTERPRETATION Downregulated expression of genes responsible for fatty acid activation and metabolism may contribute to an inflammatory oxylipin profile and limit the effects of LC n-3 PUFAs in obesity. There may be a need for personalised LC n-3 PUFA supplementation based on obesity status. FUNDING European Commission Seventh Framework Programme (Grant Number 244995) and Czech Academy of Sciences (Lumina quaeruntur LQ200111901).
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Affiliation(s)
- Helena L Fisk
- School of Human Development and Health, Faculty of Medicine, Southampton General Hospital, University of Southampton, IDS Building, MP887, Tremona Road, Southampton SO16 6YD, United Kingdom.
| | - Caroline E Childs
- School of Human Development and Health, Faculty of Medicine, Southampton General Hospital, University of Southampton, IDS Building, MP887, Tremona Road, Southampton SO16 6YD, United Kingdom
| | - Elizabeth A Miles
- School of Human Development and Health, Faculty of Medicine, Southampton General Hospital, University of Southampton, IDS Building, MP887, Tremona Road, Southampton SO16 6YD, United Kingdom
| | - Robert Ayres
- School of Human Development and Health, Faculty of Medicine, Southampton General Hospital, University of Southampton, IDS Building, MP887, Tremona Road, Southampton SO16 6YD, United Kingdom
| | - Paul S Noakes
- School of Human Development and Health, Faculty of Medicine, Southampton General Hospital, University of Southampton, IDS Building, MP887, Tremona Road, Southampton SO16 6YD, United Kingdom; Medical School, University of Notre Dame Australia, Fremantle, Australia
| | - Carolina Paras-Chavez
- School of Human Development and Health, Faculty of Medicine, Southampton General Hospital, University of Southampton, IDS Building, MP887, Tremona Road, Southampton SO16 6YD, United Kingdom
| | - Ondrej Kuda
- Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic
| | - Jan Kopecký
- Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic
| | - Elie Antoun
- School of Human Development and Health, Faculty of Medicine, Southampton General Hospital, University of Southampton, IDS Building, MP887, Tremona Road, Southampton SO16 6YD, United Kingdom
| | - Karen A Lillycrop
- School of Human Development and Health, Faculty of Medicine, Southampton General Hospital, University of Southampton, IDS Building, MP887, Tremona Road, Southampton SO16 6YD, United Kingdom; School of Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton, United Kingdom
| | - Philip C Calder
- School of Human Development and Health, Faculty of Medicine, Southampton General Hospital, University of Southampton, IDS Building, MP887, Tremona Road, Southampton SO16 6YD, United Kingdom; NIHR Southampton Biomedical Research Centre, University Hospital Southampton NHS Foundation Trust and University of Southampton, Southampton, United Kingdom
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Park Y, Zhang Q, Fernandes JMO, Wiegertjes GF, Kiron V. Macrophage Heterogeneity in the Intestinal Cells of Salmon: Hints From Transcriptomic and Imaging Data. Front Immunol 2021; 12:798156. [PMID: 35003123 PMCID: PMC8733388 DOI: 10.3389/fimmu.2021.798156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 11/24/2021] [Indexed: 11/13/2022] Open
Abstract
The intestine has many types of cells that are present mostly in the epithelium and lamina propria. The importance of the intestinal cells for the mammalian mucosal immune system is well-established. However, there is no in-depth information about many of the intestinal cells in teleosts. In our previous study, we reported that adherent intestinal cells (AIC) predominantly express macrophage-related genes. To gather further evidence that AIC include macrophage-like cells, we compared their phagocytic activity and morphology with those of adherent head kidney cells (AKC), previously characterized as macrophage-like cells. We also compared equally abundant as well as differentially expressed mRNAs and miRNAs between AIC and AKC. AIC had lower phagocytic activity and were larger and more circular than macrophage-like AKC. RNA-Seq data revealed that there were 18309 mRNAs, with 59 miRNAs that were equally abundant between AIC and AKC. Integrative analysis of the mRNA and miRNA transcriptomes revealed macrophage heterogeneity in both AIC and AKC. In addition, analysis of AIC and AKC transcriptomes revealed functional characteristics of mucosal and systemic macrophages. Five pairs with significant negative correlations between miRNA and mRNAs were linked to macrophages and epithelial cells and their interaction could be pointing to macrophage activation and differentiation. The potential macrophage markers suggested in this study should be investigated under different immune conditions to understand the exact macrophage phenotypes.
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Affiliation(s)
- Youngjin Park
- Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway
| | - Qirui Zhang
- Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway
| | | | - Geert F. Wiegertjes
- Aquaculture and Fisheries Group, Wageningen University & Research, Wageningen, Netherlands
| | - Viswanath Kiron
- Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway
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Chrobok NL, Bol JGJM, Wilhelmus MMM, Drukarch B, van Dam AM. Tissue Transglutaminase Appears in Monocytes and Macrophages but Not in Lymphocytes in White Matter Multiple Sclerosis Lesions. J Neuropathol Exp Neurol 2020; 78:492-500. [PMID: 31058279 PMCID: PMC6524631 DOI: 10.1093/jnen/nlz030] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Leukocyte infiltration is an important pathological hallmark of multiple sclerosis (MS) and is therefore targeted by current MS therapies. The enzyme tissue transglutaminase (TG2) contributes to monocyte/macrophage migration and is present in MS lesions and could be a potential therapeutic target. We examined the cellular identity of TG2-expressing cells by immunohistochemistry in white matter lesions of 13 MS patients; 9 active and chronic active lesions from 4 patients were analyzed in detail. In these active MS lesions, TG2 is predominantly expressed in leukocytes (CD45+) but not in cells of the lymphocyte lineage, that is, T cells (CD3+) and B cells (CD20+). In general, cells of the monocyte/macrophage lineage (CD11b+ or CD68+) are TG2+ but no further distinction could be made regarding pro- or anti-inflammatory macrophage subtypes. In conclusion, TG2 is abundantly present in cells of the monocyte/macrophage lineage in active white matter MS lesions. We consider that TG2 can play a role in MS as it is associated with macrophage infiltration into the CNS. As such, TG2 potentially presents a novel target for therapeutic intervention that can support available MS therapies targeting lymphocyte infiltration.
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Affiliation(s)
- Navina L Chrobok
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, Amsterdam UMC, location VUmc, Amsterdam, The Netherlands
| | - John G J M Bol
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, Amsterdam UMC, location VUmc, Amsterdam, The Netherlands
| | - Micha M M Wilhelmus
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, Amsterdam UMC, location VUmc, Amsterdam, The Netherlands
| | - Benjamin Drukarch
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, Amsterdam UMC, location VUmc, Amsterdam, The Netherlands
| | - Anne-Marie van Dam
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, Amsterdam UMC, location VUmc, Amsterdam, The Netherlands
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8
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Transglutaminases, neuronal cell death and neural repair: implications for traumatic brain injury and therapeutics. Curr Opin Neurol 2019; 32:796-801. [DOI: 10.1097/wco.0000000000000753] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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9
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Sun H, Kaartinen MT. Transglutaminases in Monocytes and Macrophages. ACTA ACUST UNITED AC 2018; 6:medsci6040115. [PMID: 30545030 PMCID: PMC6313455 DOI: 10.3390/medsci6040115] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 12/03/2018] [Accepted: 12/07/2018] [Indexed: 12/28/2022]
Abstract
Macrophages are key players in various inflammatory disorders and pathological conditions via phagocytosis and orchestrating immune responses. They are highly heterogeneous in terms of their phenotypes and functions by adaptation to different organs and tissue environments. Upon damage or infection, monocytes are rapidly recruited to tissues and differentiate into macrophages. Transglutaminases (TGs) are a family of structurally and functionally related enzymes with Ca2+-dependent transamidation and deamidation activity. Numerous studies have shown that TGs, particularly TG2 and Factor XIII-A, are extensively involved in monocyte- and macrophage-mediated physiological and pathological processes. In the present review, we outline the current knowledge of the role of TGs in the adhesion and extravasation of monocytes, the expression of TGs during macrophage differentiation, and the regulation of TG2 expression by various pro- and anti-inflammatory mediators in macrophages. Furthermore, we summarize the role of TGs in macrophage phagocytosis and the understanding of the mechanisms involved. Finally, we review the roles of TGs in tissue-specific macrophages, including monocytes/macrophages in vasculature, alveolar and interstitial macrophages in lung, microglia and infiltrated monocytes/macrophages in central nervous system, and osteoclasts in bone. Based on the studies in this review, we conclude that monocyte- and macrophage-derived TGs are involved in inflammatory processes in these organs. However, more in vivo studies and clinical studies during different stages of these processes are required to determine the accurate roles of TGs, their substrates, and the mechanisms-of-action.
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Affiliation(s)
- Huifang Sun
- Division of Biomedical Sciences, Faculty of Dentistry, McGill University, Montreal, QC, H3A 0C7, Canada.
| | - Mari T Kaartinen
- Division of Biomedical Sciences, Faculty of Dentistry, McGill University, Montreal, QC, H3A 0C7, Canada.
- Division of Experimental Medicine, Department of Medicine, Faculty of Medicine, McGill University, Montreal, QC, H3A 0C7, Canada.
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Katt WP, Antonyak MA, Cerione RA. The diamond anniversary of tissue transglutaminase: a protein of many talents. Drug Discov Today 2018; 23:575-591. [PMID: 29362136 PMCID: PMC5864117 DOI: 10.1016/j.drudis.2018.01.037] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 11/28/2017] [Accepted: 01/12/2018] [Indexed: 12/21/2022]
Abstract
Tissue transglutaminase (tTG) is capable of binding and hydrolyzing GTP, as well as catalyzing an enzymatic transamidation reaction that crosslinks primary amines to glutamine residues. tTG adopts two vastly different conformations, depending on whether it is functioning as a GTP-binding protein or a crosslinking enzyme. It has been shown to have important roles in several different aspects of cancer progression, making it an attractive target for therapeutic intervention. Here, we highlight many of the major findings involving tTG since its discovery 60 years ago, and describe recent drug discovery efforts that target specific activities or conformations of this unique protein.
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Affiliation(s)
- William P Katt
- Department of Molecular Medicine, Cornell University, NY, USA
| | - Marc A Antonyak
- Department of Molecular Medicine, Cornell University, NY, USA
| | - Richard A Cerione
- Department of Molecular Medicine, Cornell University, NY, USA; Department of Chemistry and Chemical Biology, Cornell University, NY, USA.
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11
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Sestito C, Brevé JJP, van Eggermond MCJA, Killestein J, Teunissen CE, van Rossum J, Wilhelmus MMM, Drukarch B, van den Elsen PJ, van Dam AM. Monocyte-derived tissue transglutaminase in multiple sclerosis patients: reflecting an anti-inflammatory status and function of the cells? J Neuroinflammation 2017; 14:257. [PMID: 29268771 PMCID: PMC5740592 DOI: 10.1186/s12974-017-1035-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 12/11/2017] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Leukocyte infiltration into the central nervous system is an important feature of multiple sclerosis (MS) pathology. Among the infiltrating cells, monocytes comprise the largest population and are considered to play a dual role in the course of the disease. The enzyme tissue transglutaminase (TG2), produced by monocytes, plays a central role in monocyte adhesion/migration in animal models of MS. In the present study, we questioned whether TG2 expression is altered in monocytes from MS patients compared to healthy control (HC) subjects. Moreover, we determined the inflammatory status of these TG2-expressing monocytes, what inflammatory factor regulates TG2 expression, and whether TG2 can functionally contribute to their adhesion/migration processes. METHODS Primary human monocytes from MS patients and HC subjects were collected, RNA isolated and subjected to qPCR analysis. Human THP-1 monocytes were lentivirally transduced with TG2 siRNA or control and treated with various cytokines. Subsequently, mRNA levels of inflammatory factors, adhesion properties, and activity of RhoA were analyzed in interleukin (IL)-4-treated monocytes. RESULTS TG2 mRNA levels are significantly increased in monocytes derived from MS patients compared to HC subjects. In addition, correlation analyses indicated that TG2-expressing cells display a more anti-inflammatory, migratory profile in MS patients. Using THP-1 monocytes, we observed that IL-4 is a major trigger of TG2 expression in these cells. Furthermore, knockdown of TG2 expression leads to a pro-inflammatory profile and reduced adhesion/migration properties of IL-4-treated monocytes. CONCLUSIONS TG2-expressing monocytes in MS patients have a more anti-inflammatory profile. Furthermore, TG2 mediates IL-4-induced anti-inflammatory status in THP-1 monocytes, adhesion, and cytoskeletal rearrangement in vitro. We thus propose that IL-4 upregulates TG2 expression in monocytes of MS patients, driving them into an anti-inflammatory status.
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Affiliation(s)
- Claudia Sestito
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, VU University Medical Center, Postbus 7057, 1007 MB, Amsterdam, the Netherlands.,Present Address: Brain Plasticity Group, Center for Neuroscience, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, Amsterdam, the Netherlands
| | - John J P Brevé
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, VU University Medical Center, Postbus 7057, 1007 MB, Amsterdam, the Netherlands
| | - Marja C J A van Eggermond
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands
| | - Joep Killestein
- Department of Neurology, VU University Medical Center, Amsterdam, the Netherlands
| | - Charlotte E Teunissen
- Department of Clinical Chemistry, VU University Medical Center, Amsterdam, the Netherlands
| | - Joram van Rossum
- Department of Neurology, VU University Medical Center, Amsterdam, the Netherlands
| | - Micha M M Wilhelmus
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, VU University Medical Center, Postbus 7057, 1007 MB, Amsterdam, the Netherlands
| | - Benjamin Drukarch
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, VU University Medical Center, Postbus 7057, 1007 MB, Amsterdam, the Netherlands
| | - Peter J van den Elsen
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands.,Department of Pathology, VU University Medical Center, Amsterdam, the Netherlands
| | - Anne-Marie van Dam
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, VU University Medical Center, Postbus 7057, 1007 MB, Amsterdam, the Netherlands.
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12
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Eligini S, Fiorelli S, Tremoli E, Colli S. Inhibition of transglutaminase 2 reduces efferocytosis in human macrophages: Role of CD14 and SR-AI receptors. Nutr Metab Cardiovasc Dis 2016; 26:922-930. [PMID: 27378395 DOI: 10.1016/j.numecd.2016.05.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 04/28/2016] [Accepted: 05/25/2016] [Indexed: 01/23/2023]
Abstract
BACKGROUND AND AIMS Transglutaminase 2 (TGM2), a member of the transglutaminase family of enzymes, is a multifunctional protein involved in numerous events spanning from cell differentiation, to signal transduction, apoptosis, and wound healing. It is expressed in a variety of cells, macrophages included. Macrophage TGM2 promotes the clearance of apoptotic cells (efferocytosis) and emerging evidence suggests that defective efferocytosis contributes to the consequences of inflammation-associated diseases, including atherosclerotic lesion progression and its sequelae. Of interest, active TGM2 identified in human atherosclerotic lesions plays critical roles in plaque stability through effects on matrix cross-linking and TGFβ activity. This study explores the mechanisms by which TGM2 controls efferocytosis in human macrophages. METHODS AND RESULTS Herein we show that TGM2 increases progressively during monocyte differentiation towards macrophages and controls their efferocytic potential as well as morphology and viability. Two experimental approaches that took advantage of the inhibition of TGM2 activity and protein silencing give proof that TGM2 reduction significantly impairs macrophage efferocytosis. Among the mechanisms involved we highlighted a role of the receptors CD14 and SR-AI whose levels were markedly reduced by TGM2 inhibition. Conversely, CD36 receptor and αvβ3 integrin levels were not influenced. Of note, lipid accumulation and IL-10 secretion were reduced in macrophages displaying defective efferocytosis. CONCLUSION Overall, our data define a crucial role of TGM2 activity during macrophage differentiation via mechanisms involving CD14 and SR-AI receptors and show that TGM2 inhibition triggers a pro-inflammatory phenotype.
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Affiliation(s)
- S Eligini
- Centro Cardiologico Monzino I.R.C.C.S., Milan, Italy.
| | - S Fiorelli
- Centro Cardiologico Monzino I.R.C.C.S., Milan, Italy
| | - E Tremoli
- Centro Cardiologico Monzino I.R.C.C.S., Milan, Italy
| | - S Colli
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
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13
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Is monocyte- and macrophage-derived tissue transglutaminase involved in inflammatory processes? Amino Acids 2016; 49:441-452. [PMID: 27659795 PMCID: PMC5332491 DOI: 10.1007/s00726-016-2334-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 09/15/2016] [Indexed: 02/07/2023]
Abstract
Monocytes and macrophages are key players in inflammatory processes following an infection or tissue damage. Monocytes adhere and extravasate into the inflamed tissue, differentiate into macrophages, and produce inflammatory mediators to combat the pathogens. In addition, they take up dead cells and debris and, therefore, take part in the resolution of inflammation. The multifunctional enzyme tissue Transglutaminase (TG2, tTG) is known to participate in most of those monocyte- and macrophage-mediated processes. Moreover, TG2 expression and activity can be regulated by inflammatory mediators. In the present review, we selectively elaborate on the expression, regulation, and contribution of TG2 derived from monocytes and macrophages to inflammatory processes mediated by those cells. In addition, we discuss the role of TG2 in certain pathological conditions, in which inflammation and monocytes and/or macrophages are prominently present, including atherosclerosis, sepsis, and multiple sclerosis. Based on the studies and considerations reported in this review, we conclude that monocyte- and macrophage-derived TG2 is clearly involved in various processes contributing to inflammation. However, TG2’s potential as a therapeutic target to counteract the possible detrimental effects or stimulate the potential beneficial effects on monocyte and macrophage responses during inflammation should be carefully considered. Alternatively, as TG2-related parameters can be used as a marker of disease, e.g., in celiac disease, or of disease-stage, e.g., in cancer, we put forward that this could be subject of research for monocyte- or macrophage-derived TG2 in inflammatory diseases.
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14
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Agnihotri N, Mehta K. Transglutaminase-2: evolution from pedestrian protein to a promising therapeutic target. Amino Acids 2016; 49:425-439. [PMID: 27562794 DOI: 10.1007/s00726-016-2320-2] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 08/18/2016] [Indexed: 12/16/2022]
Abstract
The ability of cancer cells to metastasize represents the most devastating feature of cancer. Currently, there are no specific biomarkers or therapeutic targets that can be used to predict the risk or to treat metastatic cancer. Many recent reports have demonstrated elevated expression of transglutaminase 2 (TG2) in multiple drug-resistant and metastatic cancer cells. TG2 is a multifunctional protein mostly known for catalyzing Ca2+-dependent -acyl transferase reaction to form protein crosslinks. Besides this transamidase activity, many Ca2+-independent and non-enzymatic activities of TG2 have been identified. Both, the enzymatic and non-enzymatic activities of TG2 have been implicated in diverse pathophysiological processes such as wound healing, cell growth, cell survival, extracellular matrix modification, apoptosis, and autophagy. Tumors have been frequently referred to as 'wounds that never heal'. Based on the observation that TG2 plays an important role in wound healing and inflammation is known to facilitate cancer growth and progression, we discuss the evidence that TG2 can reprogram inflammatory signaling networks that play fundamental roles in cancer progression. TG2-regulated signaling bestows on cancer cells the ability to proliferate, to resist cell death, to invade, to reprogram glucose metabolism and to metastasize, the attributes that are considered important hallmarks of cancer. Therefore, inhibiting TG2 may offer a novel therapeutic approach for managing and treatment of metastatic cancer. Strategies to inhibit TG2-regulated pathways will also be discussed.
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Affiliation(s)
- Navneet Agnihotri
- Department of Experimental Therapeutics, Unit 1950, University of Texas MD Anderson Cancer Center, 1901 East Road, Houston, TX, 77054, USA. .,Department of Biochemistry, Panjab University, Sector 14, Chandigarh, 110 014, India.
| | - Kapil Mehta
- Department of Experimental Therapeutics, Unit 1950, University of Texas MD Anderson Cancer Center, 1901 East Road, Houston, TX, 77054, USA. .,MolQ Personalized Medicine, 4505 Maple Street, Bellaire, TX, 77401, USA.
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15
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Christensen B, Zachariae ED, Scavenius C, Kløverpris S, Oxvig C, Petersen SV, Enghild JJ, Sørensen ES. Transglutaminase 2-Catalyzed Intramolecular Cross-Linking of Osteopontin. Biochemistry 2016; 55:294-303. [PMID: 26678563 DOI: 10.1021/acs.biochem.5b01153] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Osteopontin (OPN) is a multifunctional integrin-binding protein present in several tissues and body fluids. OPN is a substrate for the enzyme transglutaminase 2 (TG2), which catalyzes inter- and intramolecular cross-linking affecting the biological activity of the protein. Polymerization of OPN by intermolecular cross-linking has mostly been studied using relatively high TG2 concentrations, whereas the effect of lower concentrations of TG2 has remained unexplored. Here we show that TG2 at physiologically relevant concentrations predominantly catalyzes the formation of intramolecular cross-links in OPN. By site-directed mutagenesis and mass spectrometry, we demonstrate that Gln(42) and Gln(193) serve as the primary amine acceptor sites for isopeptide bond formation. We find that Gln(42) predominantly is linked to Lys(4) and that Gln(193) participates in a cross-link with Lys(154), Lys(157), or Lys(231). The formation of specific isopeptide bonds was not dependent on OPN phosphorylation, and similar patterns of cross-linking were observed in human and mouse OPN. Furthermore, we find that OPN purified from human urine contains the Lys(154)-Gln(193) isopeptide bond, indicating that intramolecular cross-linking of OPN occurs in vivo. Collectively, these data suggest that specific intramolecular cross-linking in the N- and C-terminal parts of OPN is most likely the dominant step in TG2-catalyzed modification of OPN.
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Affiliation(s)
- Brian Christensen
- Department of Molecular Biology and Genetics, Aarhus University , 8000 Aarhus C, Denmark
| | - Elias D Zachariae
- Department of Molecular Biology and Genetics, Aarhus University , 8000 Aarhus C, Denmark
| | - Carsten Scavenius
- Department of Molecular Biology and Genetics, Aarhus University , 8000 Aarhus C, Denmark
| | - Søren Kløverpris
- Department of Molecular Biology and Genetics, Aarhus University , 8000 Aarhus C, Denmark
| | - Claus Oxvig
- Department of Molecular Biology and Genetics, Aarhus University , 8000 Aarhus C, Denmark
| | - Steen V Petersen
- Department of Biomedicine, Aarhus University , 8000 Aarhus C, Denmark
| | - Jan J Enghild
- Department of Molecular Biology and Genetics, Aarhus University , 8000 Aarhus C, Denmark.,Interdisciplinary Nanoscience Center, Aarhus University , 8000 Aarhus C, Denmark
| | - Esben S Sørensen
- Department of Molecular Biology and Genetics, Aarhus University , 8000 Aarhus C, Denmark.,Interdisciplinary Nanoscience Center, Aarhus University , 8000 Aarhus C, Denmark
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16
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Rhee JS, Kim BM, Jeong CB, Horiguchi T, Lee YM, Kim IC, Lee JS. Immune gene mining by pyrosequencing in the rockshell, Thais clavigera. FISH & SHELLFISH IMMUNOLOGY 2012; 32:700-710. [PMID: 22289713 DOI: 10.1016/j.fsi.2012.01.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Revised: 01/12/2012] [Accepted: 01/13/2012] [Indexed: 05/31/2023]
Abstract
The rockshell, Thais clavigera (Gastropoda: Muricidae) has been shown to be a useful species as a potential indicator for diverse pollution in the marine environment. However, their genetic information is still not widely available. Here, we performed an extensive transcriptome analysis of T. clavigera using the pyrosequencing method, and selected innate immune-related genes. Among the unigenes obtained in this species, we annotated a number of immune system-related genes (e.g. adhesive protein, antimicrobial protein, apoptosis- and cell cycle-related protein, cellular defense effector, immune regulator, pattern recognition protein, protease, protease inhibitor, reduction/oxidation-related protein, signal transduction-related protein and stress protein), which are potentially useful for immunity research in this species. To confirm the usefulness of potential immune-biomarker genes, we checked the transcript level of specific immune genes in both different tissues and LPS-exposed rockshells within the T. clavigera transcript database. This study would be helpful to extend our knowledge on the immune system of rockshell in comparative aspects. Also it would be useful to develop the rockshell as a potential test organism for monitoring of marine environment quality.
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Affiliation(s)
- Jae-Sung Rhee
- Department of Molecular and Environmental Bioscience, Graduate School, Hanyang University, Seoul, South Korea
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17
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18
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Kim SY. Transglutaminase 2: a new paradigm for NF-kappaB involvement in disease. ADVANCES IN ENZYMOLOGY AND RELATED AREAS OF MOLECULAR BIOLOGY 2011; 78:161-95. [PMID: 22220474 DOI: 10.1002/9781118105771.ch4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Soo-Youl Kim
- Division of Cancer Biology, Research Institute, National Cancer Center, Kyonggi-do, Republic of Korea
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19
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Muszbek L, Bereczky Z, Bagoly Z, Komáromi I, Katona É. Factor XIII: a coagulation factor with multiple plasmatic and cellular functions. Physiol Rev 2011; 91:931-72. [PMID: 21742792 DOI: 10.1152/physrev.00016.2010] [Citation(s) in RCA: 332] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Factor XIII (FXIII) is unique among clotting factors for a number of reasons: 1) it is a protransglutaminase, which becomes activated in the last stage of coagulation; 2) it works on an insoluble substrate; 3) its potentially active subunit is also present in the cytoplasm of platelets, monocytes, monocyte-derived macrophages, dendritic cells, chondrocytes, osteoblasts, and osteocytes; and 4) in addition to its contribution to hemostasis, it has multiple extra- and intracellular functions. This review gives a general overview on the structure and activation of FXIII as well as on the biochemical function and downregulation of activated FXIII with emphasis on new developments in the last decade. New aspects of the traditional functions of FXIII, stabilization of fibrin clot, and protection of fibrin against fibrinolysis are summarized. The role of FXIII in maintaining pregnancy, its contribution to the wound healing process, and its proangiogenic function are reviewed in details. Special attention is given to new, less explored, but promising fields of FXIII research that include inhibition of vascular permeability, cardioprotection, and its role in cartilage and bone development. FXIII is also considered as an intracellular enzyme; a separate section is devoted to its intracellular activation, intracellular action, and involvement in platelet, monocyte/macrophage, and dendritic cell functions.
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Affiliation(s)
- László Muszbek
- Clinical Research Center and Thrombosis, Haemostasis and Vascular Biology Research Group of the Hungarian Academy of Sciences, University of Debrecen, Medical and Health Science Center, Debrecen, Hungary.
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20
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Kim DS, Kim B, Tahk H, Kim DH, Ahn ER, Choi C, Jeon Y, Park SY, Lee H, Oh SH, Kim SY. Transglutaminase 2 gene ablation protects against renal ischemic injury by blocking constant NF-κB activation. Biochem Biophys Res Commun 2010; 403:479-84. [PMID: 21094133 DOI: 10.1016/j.bbrc.2010.11.063] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Accepted: 11/15/2010] [Indexed: 02/07/2023]
Abstract
Transglutaminase 2 knockout (TGase2(-/-)) mice show significantly reduced inflammation with decreased myofibroblasts in a unilateral ureteral obstruction (UUO) model, but the mechanism remains to be clarified. Nuclear factor-κB (NF-κB) activation plays a major role in the progression of inflammation in an obstructive nephropathy model. However, the key factors extending the duration of NF-κB activation in UUO are not known. In several inflammatory diseases, we and others recently found that TGase 2 plays a key role in extending NF-κB activation, which contributes to the pathogenesis of disease. In the current study, we found that NF-κB activity in mouse embryogenic fibroblasts (MEFs) from TGase2(-/-) mice remained at the control level while the NF-κB activity of wild-type (WT) MEFs was highly increased under hypoxic stress. Using the obstructive nephropathy model, we found that NF-κB activity remained at the control level in TGase2(-/-) mouse kidney tissues, as measured by COX-2 expression, but was highly increased in WT tissues. We conclude that TGase 2 gene ablation reduces the duration of NF-κB activation in ischemic injury.
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Affiliation(s)
- Dae-Seok Kim
- Cancer Cell and Molecular Biology Branch, Division of Cancer Biology, Research Institute, 111 Jungbalsan-ro, Ilsandong-gu, Goyang, Gyeonggi-do 410-769, Republic of Korea
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21
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Tissue transglutaminase contributes to the all-trans-retinoic acid–induced differentiation syndrome phenotype in the NB4 model of acute promyelocytic leukemia. Blood 2010; 116:3933-43. [DOI: 10.1182/blood-2010-01-266064] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
Treatment of acute promyelocytic leukemia (APL) with all-trans-retinoic acid (ATRA) results in terminal differentiation of leukemic cells toward neutrophil granulocytes. Administration of ATRA leads to massive changes in gene expression, including down-regulation of cell proliferation–related genes and induction of genes involved in immune function. One of the most induced genes in APL NB4 cells is transglutaminase 2 (TG2). RNA interference–mediated stable silencing of TG2 in NB4 cells (TG2-KD NB4) coupled with whole genome microarray analysis revealed that TG2 is involved in the expression of a large number of ATRA-regulated genes. The affected genes participate in granulocyte functions, and their silencing lead to reduced adhesive, migratory, and phagocytic capacity of neutrophils and less superoxide production. The expression of genes related to cell-cycle control also changed, suggesting that TG2 regulates myeloid cell differentiation. CC chemokines CCL2, CCL3, CCL22, CCL24, and cytokines IL1B and IL8 involved in the development of differentiation syndrome are expressed at significantly lower level in TG2-KD NB4 than in wild-type NB4 cells upon ATRA treatment. Based on our results, we propose that reduced expression of TG2 in differentiating APL cells may suppress effector functions of neutrophil granulocytes and attenuate the ATRA-induced inflammatory phenotype of differentiation syndrome.
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22
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Rébé C, Raveneau M, Chevriaux A, Lakomy D, Sberna AL, Costa A, Bessède G, Athias A, Steinmetz E, Lobaccaro JMA, Alves G, Menicacci A, Vachenc S, Solary E, Gambert P, Masson D. Induction of transglutaminase 2 by a liver X receptor/retinoic acid receptor alpha pathway increases the clearance of apoptotic cells by human macrophages. Circ Res 2009; 105:393-401. [PMID: 19628791 DOI: 10.1161/circresaha.109.201855] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
RATIONALE Liver X receptors (LXRs) are oxysterol-activated nuclear receptors that are involved in the control of cholesterol homeostasis and inflammatory response. Human monocytes and macrophages express high levels of these receptors and are appropriate cells to study the response to LXR agonists. OBJECTIVE The purpose of this study was to identify new LXR targets in human primary monocytes and macrophages and the consequences of their activation. METHODS AND RESULTS We show that LXR agonists significantly increase the mRNA and protein levels of the retinoic acid receptor (RAR)alpha in primary monocytes and macrophages. LXR agonists promote RARalpha gene transcription through binding to a specific LXR response element on RARalpha gene promoter. Preincubation of monocytes or macrophages with LXR agonists before RARalpha agonist treatment enhances synergistically the expression of several RARalpha target genes. One of these genes encodes transglutaminase (TGM)2, a key factor required for macrophage phagocytosis. Accordingly, the combination of LXR and RARalpha agonists at concentrations found in human atherosclerotic plaques markedly enhances the capabilities of macrophages to engulf apoptotic cells in a TGM2-dependent manner. CONCLUSIONS These results indicate an important role for LXRs in the control of phagocytosis through an RARalpha-TGM2-dependent mechanism. A combination of LXR/RARalpha agonists that may operate in atherosclerosis could also constitute a promising strategy to improve the clearance of apoptotic cells by macrophages in other pathological situations.
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Affiliation(s)
- Cédric Rébé
- Institut Fédératif de Recherche Santé-STIC, Faculté de Médecine, Université de Bourgogne, Dijon, France.
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23
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Tóth B, Garabuczi É, Sarang Z, Vereb G, Vámosi G, Aeschlimann D, Blaskó B, Bécsi B, Erdõdi F, Lacy-Hulbert A, Zhang A, Falasca L, Birge RB, Balajthy Z, Melino G, Fésüs L, Szondy Z. Transglutaminase 2 Is Needed for the Formation of an Efficient Phagocyte Portal in Macrophages Engulfing Apoptotic Cells. THE JOURNAL OF IMMUNOLOGY 2009; 182:2084-92. [DOI: 10.4049/jimmunol.0803444] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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24
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Kim DS, Park KS, Jeong KC, Lee BI, Lee CH, Kim SY. Glucosamine is an effective chemo-sensitizer via transglutaminase 2 inhibition. Cancer Lett 2008; 273:243-9. [PMID: 18804908 DOI: 10.1016/j.canlet.2008.08.015] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Revised: 06/10/2008] [Accepted: 08/06/2008] [Indexed: 01/05/2023]
Abstract
Aberrant increases of transglutaminase 2 (TGase 2) in tumors contribute to drug resistance. The role of TGase 2 in cancer pathogenesis was unknown until we showed that TGase 2 activates NF-kappaB in the absence of kinase-dependent phosphorylation. It appears that increased expression of TGase 2 is responsible for the constitutive activation of NF-kappaB in cancer cells. We have demonstrated that TGase 2 inhibition using siRNA, cystamine or R2 peptide promotes cell death in drug-resistant cancer cells through NF-kappaB inactivation. Therefore, a safe and effective small molecule for TGase 2 inhibition is being sought in the development of therapeutics for malignant cancers. By screening for TGase inhibitors in a natural compound library, we found that glucosamine has a TGase 2 inhibitory effect in vitro. Glucosamine also recovered the depletion of I-kappaBalpha via TGase 2 inhibition, which resulted in a decrease of NF-kappaB activity in EcR293/TG cells. Furthermore, glucosamine efficiently promoted cell death via inhibiting TGase 2-mediated NF-kappaB activation in drug-resistant breast cancer cells. These results suggest that glucosamine, as a TGase 2 inhibitor, might be an attractive novel target for treatment of malignant cancers.
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Affiliation(s)
- Dae-Seok Kim
- Molecular Oncology Branch, Division of Basic and Applied Sciences, Research Institute National Cancer Center, Goyang, Gyeonggi-do 410-769, Republic of Korea
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25
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Segers-Nolten IMJ, Wilhelmus MMM, Veldhuis G, van Rooijen BD, Drukarch B, Subramaniam V. Tissue transglutaminase modulates alpha-synuclein oligomerization. Protein Sci 2008; 17:1395-402. [PMID: 18505736 DOI: 10.1110/ps.036103.108] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We have studied the interaction of the enzyme tissue transglutaminase (tTG), catalyzing cross-link formation between protein-bound glutamine residues and primary amines, with Parkinson's disease-associated alpha-synuclein protein variants at physiologically relevant concentrations. We have, for the first time, determined binding affinities of tTG for wild-type and mutant alpha-synucleins using surface plasmon resonance approaches, revealing high-affinity nanomolar equilibrium dissociation constants. Nanomolar tTG concentrations were sufficient for complete inhibition of fibrillization by effective alpha-synuclein cross-linking, resulting predominantly in intramolecularly cross-linked monomers accompanied by an oligomeric fraction. Since oligomeric species have a pathophysiological relevance we further investigated the properties of the tTG/alpha-synuclein oligomers. Atomic force microscopy revealed morphologically similar structures for oligomers from all alpha-synuclein variants; the extent of oligomer formation was found to correlate with tTG concentration. Unlike normal alpha-synuclein oligomers the resultant structures were extremely stable and resistant to GdnHCl and SDS. In contrast to normal beta-sheet-containing oligomers, the tTG/alpha-synuclein oligomers appear to be unstructured and are unable to disrupt phospholipid vesicles. These data suggest that tTG binds equally effective to wild-type and disease mutant alpha-synuclein variants. We propose that tTG cross-linking imposes structural constraints on alpha-synuclein, preventing the assembly of structured oligomers required for disruption of membranes and for progression into fibrils. In general, cross-linking of amyloid forming proteins by tTG may prevent the progression into pathogenic species.
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Affiliation(s)
- Ine M J Segers-Nolten
- Biophysical Engineering Group, MESA+ Institute for Nanotechnology and Institute for Biomedical Technology, University of Twente, 7500 AE Enschede, The Netherlands
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26
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Paupert J, Dauvillier S, Salles B, Muller C. Transport of the leaderless protein Ku on the cell surface of activated monocytes regulates their migratory abilities. EMBO Rep 2007; 8:583-8. [PMID: 17496833 PMCID: PMC2002536 DOI: 10.1038/sj.embor.7400976] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2006] [Revised: 04/02/2007] [Accepted: 04/02/2007] [Indexed: 11/08/2022] Open
Abstract
Recent evidence shows that the DNA repair protein Ku is expressed on the surface of a subset of cells, where it contributes to adhesion and invasion processes, and also to viral or bacterial entry into target cells. Here, we show that Ku was expressed on the cell surface during activation of human monocytes and that its expression was independent of the conventional endoplasmic reticulum (ER)/Golgi secretory pathway. Ku inhibition, by blocking antibodies, decreases the migration of monocytes on fibronectin and laminin. On activation, nuclear Ku seems to move to the periphery of the cell and it shows a punctuate staining in the cytoplasm. The cytoplasmic distribution of Ku was shown to be unaltered by brefeldin A. Protease protection experiments show that Ku is contained within vesicles in activated monocytes. These data support a new role for Ku in the migration of monocytes into tissues, which depends on a tightly regulated pathway of intracellular redistribution.
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Affiliation(s)
- Jenny Paupert
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 Route de Narbonne, 31077 Toulouse cedex, France
| | - Stéphanie Dauvillier
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 Route de Narbonne, 31077 Toulouse cedex, France
| | - Bernard Salles
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 Route de Narbonne, 31077 Toulouse cedex, France
- Tel: +33 561 17 59 36; Fax: +33 561 17 59 33; E-mail:
| | - Catherine Muller
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 Route de Narbonne, 31077 Toulouse cedex, France
- Tel: +33 561 17 59 08; Fax: +33 561 17 59 33; E-mail:
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27
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Suh GY, Ham HS, Lee SH, Choi JC, Koh WJ, Kim SY, Lee J, Han J, Kim HP, Choi AMK, Kwon OJ. A Peptide with anti-transglutaminase activity decreases lipopolysaccharide-induced lung inflammation in mice. Exp Lung Res 2006; 32:43-53. [PMID: 16809220 DOI: 10.1080/01902140600691514] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Octapeptide R2 (KVLDGQDP), which has anti-transglutaminas (TGase) activity, decreases inflammation in allergic conjunctivitis model in guinea pigs. The authors examined the effect of R2 on lipopolysaccharide (LPS)-induced lung injury in BALB/c mice. R2 inhalation significantly decreased neutrophil count and cytokine mRNA expression in the lungs of LPS (25 mg/kg)-treated mice (P < .05). It also showed a tendency for decreased tumor necrosis factor (TNF)-alpha-immunoreactive protein in lung homogenates and significantly decreased TNF-alpha-immunoreactive protein in the serum of LPS-injected mice (P < .05). These results indicate that TGase may be a new therapeutic target in LPS-induced lung inflammation.
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Affiliation(s)
- Gee Young Suh
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
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28
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Ichikawa A, Ohashi Y, Terada S, Natsuka S, Ikura K. In vitro modification of betaine-homocysteine S-methyltransferase by tissue-type transglutaminase. Int J Biochem Cell Biol 2004; 36:1981-92. [PMID: 15203112 DOI: 10.1016/j.biocel.2004.02.014] [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] [Revised: 02/03/2004] [Accepted: 02/08/2004] [Indexed: 11/17/2022]
Abstract
Transglutaminases catalyze the cross-linking and amine incorporation of proteins, and are implicated in various biological phenomena. To elucidate the physiological roles of transglutaminase at the molecular level, we need to identify its physiological protein substrates and clarify the relationship between transglutaminase modification of protein substrates and biological responses. Here we examined whether betaine-homocysteine S-methyltransferase (BHMT: EC 2.1.1.5) can be a substrate of tissue-type transglutaminase by in vitro experiments using porcine liver BHMT and guinea pig liver transglutarninase. Guinea pig liver transglutaminase incorporated 5-(biotinamido) pentylamine and [3H] histamine into BHMT in a time-dependent manner. Putrescine and spermidine also seemed to be incorporated into BHMT by transglutaminase. In the absence of the primary amines, BHMT subunits were cross-linked intra- and intermolecularly. BHMT activity was decreased significantly through the cross-linking by transglutaminase. Histamine incorporation slightly reduced the BHMT activity. Peptide fragments of BHMT containing the glutamine residues reactive for transglutaminase reaction were isolated through biotin labelling, proteinase digestion, biotin-avidin a affinity separation, and reverse phase HPLC. The results of amino acid sequence analyses of these peptides and sequence homology alignment with other mammalian liver BHMT subunits showed that these reactive glutamine residues were located in the region near the carboxyl terminal of porcine BHMT subunit. These results suggested that the liver BHMT can be modified by tissue-type transglutaminase and its activity is regulated repressively by the modification, especially by the cross-linking. This regulatory reaction might be involved in the regulation of homocysteine metabolism in the liver.
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Affiliation(s)
- Akira Ichikawa
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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29
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Esposito C, Marra M, Giuberti G, D'Alessandro AM, Porta R, Cozzolino A, Caraglia M, Abbruzzese A. Ubiquitination of tissue transglutaminase is modulated by interferon alpha in human lung cancer cells. Biochem J 2003; 370:205-12. [PMID: 12401132 PMCID: PMC1223138 DOI: 10.1042/bj20021390] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2002] [Revised: 10/22/2002] [Accepted: 10/25/2002] [Indexed: 11/17/2022]
Abstract
The addition of 2500 i.u./ml interferon alpha (IFNalpha) for 48 h induced apoptosis, and caused an approx. 4-fold increase in the activity and expression of tissue transglutaminase (tTG), in human lung cancer H1355 cells. However, the increase in mRNA levels for tTG was just 1.6-fold. On the basis of these data, we investigated whether tTG levels may be regulated through regulation of its degradation via ubiquitination. It was found that 2500 i.u./ml IFNalpha induced a time-dependent decrease in tTG ubiquitination. On the other hand, addition of the proteasome inhibitor lactacystin led to accumulation of the ubiquitinated form of the enzyme and to a consequent increase in its expression. Treatment of the cells with the two agents combined antagonized the accumulation of the ubiquitinated isoforms of tTG induced by lactacystin and caused a potentiation of tTG expression. Moreover, the tTG inducer retinoic acid was also able to cause increased expression and ubiquitination of tTG in H1355 cells. The addition of monodansylcadaverine (a tTG inhibitor) to IFNalpha-treated H1355 cells completely antagonized growth inhibition and apoptosis induced by the cytokine. In conclusion, we demonstrate for the first time that tTG is ubiquitinated and degraded by a proteasome-dependent pathway. Moreover, IFNalpha can, at least in part, induce apoptosis through the modulation of this pathway.
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Affiliation(s)
- Carla Esposito
- Dipartimento di Chimica, Università di Salerno, Via S. Allende 1-84081 Baronissi, Salerno, Italy
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30
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Fleckenstein B, Molberg Ø, Qiao SW, Schmid DG, von der Mülbe F, Elgstøen K, Jung G, Sollid LM. Gliadin T cell epitope selection by tissue transglutaminase in celiac disease. Role of enzyme specificity and pH influence on the transamidation versus deamidation process. J Biol Chem 2002; 277:34109-16. [PMID: 12093810 DOI: 10.1074/jbc.m204521200] [Citation(s) in RCA: 168] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Tissue transglutaminase (TG2) can modify proteins by transamidation or deamidation of specific glutamine residues. TG2 has a major role in the pathogenesis of celiac disease as it is both the target of disease-specific autoantibodies and generates deamidated gliadin peptides that are recognized by CD4(+), DQ2-restricted T cells from the celiac lesions. Capillary electrophoresis with fluorescence-labeled gliadin peptides was used to separate and quantify deamidated and transamidated products. In a competition assay, the affinity of TG2 to a set of overlapping gamma-gliadin peptides was measured and compared with their recognition by celiac lesion T cells. Peptides differed considerably in their competition efficiency. Those peptides recognized by intestinal T cell lines showed marked competition indicating them as excellent substrates for TG2. The enzyme fine specificity of TG2 was characterized by synthetic peptide libraries and mass spectrometry. Residues in positions -1, +1, +2, and +3 relative to the targeted glutamine residue influenced the enzyme activity, and proline in position +2 had a particularly positive effect. The characterized sequence specificity of TG2 explained the variation between peptides as TG2 substrates indicating that the enzyme is involved in the selection of gluten T cell epitopes. The enzyme is mainly localized extracellularly in the small intestine where primary amines as substrates for the competing transamidation reaction are present. The deamidation could possibly take place in this compartment as an excess of primary amines did not completely inhibit deamidation of gluten peptides at pH 7.3. However, lowering of the pH decreased the reaction rate of the TG2-catalyzed transamidation, whereas the rate of the deamidation reaction was considerably increased. This suggests that the deamidation of gluten peptides by TG2 more likely takes place in slightly acidic environments.
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31
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Abstract
The disease mechanisms of complex inflammatory disorders are difficult to define because of extensive interactions between genetic and environmental factors. Coeliac disease is a typical complex inflammatory disorder, but this disease is unusual in that crucial genetic and environmental factors have been identified. This knowledge has allowed functional studies of the predisposing HLA molecules, the identification of antigenic epitopes and detailed studies of disease-relevant T cells in coeliac disease. This dissection of the pathogenic mechanisms of coeliac disease has uncovered principles that are relevant to other chronic inflammatory diseases.
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Affiliation(s)
- Ludvig M Sollid
- Institute of Immunology, Rikshospitalet, University of Oslo, 0027 Oslo, Norway.
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32
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Ikura K, Kokubu T, Natsuka S, Ichikawa A, Adachi M, Nishihara K, Yanagi H, Utsumi S. Co-overexpression of folding modulators improves the solubility of the recombinant guinea pig liver transglutaminase expressed in Escherichia coli. Prep Biochem Biotechnol 2002; 32:189-205. [PMID: 12071648 DOI: 10.1081/pb-120004130] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Transglutaminases (EC 2.3.2.13) catalyze the formation of epsilon-(gamma-glutamyl)lysine cross-links and the substitution of primary amines for the gamma-carboxamide groups of protein bound glutamine residues, and are involved in many biological phenomena. Transglutaminase reactions are also applicable in applied enzymology. Here, we established an expression system of recombinant mammalian tissue-type transglutaminase with high productivity. Overexpression of guinea pig liver transglutaminase in Escherichia coli, using a plasmid pET21-d, mostly resulted in the accumulation of insoluble and inactive enzyme protein. By the expression culture at lower temperatures (25 and 18 degrees C), however, a fraction of the soluble and active enzyme protein slightly increased. Co-overexpression of a molecular chaperone system (DnaK-DnaJ-GrpE) and/or a folding catalyst (trigger factor) improved the solubility of the recombinant enzyme produced in E. coli cells. The specific activity, the affinity to the amine substrate, and the sensitivity to the calcium activation and GTP inhibition of the purified soluble recombinant enzyme were lower than those of the natural liver enzyme. These results indicated that co-overexpression of folding modulators tested improved the solubility of the overproduced recombinant mammalian tissue-type transglutaminase, but the catalytic properties of the soluble recombinant enzyme were not exactly the same as those of the natural enzyme.
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Affiliation(s)
- Koji Ikura
- Department of Applied Biology, Kyoto Institute of Technology, Japan.
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33
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Akimov SS, Belkin AM. Cell surface tissue transglutaminase is involved in adhesion and migration of monocytic cells on fibronectin. Blood 2001; 98:1567-76. [PMID: 11520809 DOI: 10.1182/blood.v98.5.1567] [Citation(s) in RCA: 220] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Expression of tissue transglutaminase (transglutaminase II, tTG) was shown to increase drastically during monocyte differentiation into macrophages; however, its role in monocytic cells remains largely unknown. This study describes a novel function of cell surface tTG as an adhesion and migration receptor for fibronectin (Fn). Two structurally related transglutaminases, tTG and the A subunit of factor XIII (FXIIIA), are expressed on the surface of monocytic cells, whereas only surface tTG is associated with multiple integrins of the beta1 and beta3 subfamilies. Both surface levels of tTG and the amounts of integrin-bound tTG are sharply up-regulated during the conversion of monocytes into macrophages. In contrast, a reduction in biosynthesis and surface expression of FXIIIA accompanies monocyte differentiation. Cell surface tTG is colocalized with beta1- and beta3-integrins in podosomelike adhesive structures of macrophages adherent on Fn. Down-regulation of surface tTG by expression of antisense tTG construct or its inhibition by function-blocking antibodies significantly decreases adhesion and spreading of monocytic cells on Fn and, in particular, on the gelatin-binding fragment of Fn consisting of modules I6II1,2I7-9. Likewise, interfering with the adhesive function of surface tTG markedly reduces migration of myeloid cells on Fn and its gelatin-binding fragment. These data demonstrate that cell surface tTG serves as an integrin-associated adhesion receptor that might be involved in extravasation and migration of monocytic cells into tissues containing Fn matrices during inflammation.
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Affiliation(s)
- S S Akimov
- Department of Biochemistry, The Holland Laboratory, American Red Cross, Rockville, MD 20855, USA
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34
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Affiliation(s)
- O Molberg
- Institute of Immunology, University of Oslo, Rikshospitalet, Norway
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35
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Abstract
Tissue transglutaminase (tTG) belongs to the family of transglutaminase enzymes that catalyze the posttranslational modification of proteins via Ca(2+)-dependent cross-linking reactions. The catalytic action of tTG results in the formation of an isopeptide bond that is of great physiological significance since it is highly resistant to proteolysis and denaturants. Although tTG-mediated cross-linking reactions have been implicated to play a role in diverse biological processes, the precise physiological function of the enzyme remains unclear. Recent data, however, suggest that the protein polymers resulting from tTG-catalyzed reactions may play a role in commitment of cells to undergo apoptosis. On the same token, tTG-mediated formation of insoluble protein aggregates may underlie the markers of numerous pathological conditions, such as the senile plaques in Alzheimer's disease and the Lewy bodies in Parkinson's disease. In addition to catalyzing Ca(2+)-dependent cross-linking reactions, tTG can also bind and hydrolyze guanosine triphosphate and adenosine triphosphate. By virtue of this ability, tTG has been identified as a novel G-protein that interacts and activates phospholipase C following stimulation of the alpha-adrenergic receptor. The ability of tTG to mediate signal transduction may contribute to its involvement in the regulation of cell cycle progression. The following review summarizes the important features of this multifunctional enzyme that have emerged as a result of recent work from different laboratories.
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Affiliation(s)
- J S Chen
- Department of Bioimmunotherapy, University of Texas, M.D. Anderson Cancer Center, Houston 77030, USA
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36
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Peng X, Zhang Y, Zhang H, Graner S, Williams JF, Levitt ML, Lokshin A. Interaction of tissue transglutaminase with nuclear transport protein importin-alpha3. FEBS Lett 1999; 446:35-9. [PMID: 10100610 DOI: 10.1016/s0014-5793(99)00018-6] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Tissue transglutaminase is a multifunctional enzyme which has been involved in the regulation of cell growth, differentiation, and apoptosis. Recently, nuclear localization of tTG has been reported indicating the potential of active nuclear transport. In this study we use the yeast two-hybrid assay and co-immunoprecipitation to show that tTG interacts with the nuclear transport protein importin-alpha3. Using electron microscopy we demonstrate that nuclear expression of tTG in a non-small cell lung cancer cell line is induced by retinoic acid (RA). These data suggest that importin-alpha3 could mediate active nuclear transport of tTG which may be important for the regulation of critical cellular processes.
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Affiliation(s)
- X Peng
- Magee-Womens Research Institute, Pittsburgh, PA 15213, USA
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37
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Beninati S, Gentile V, Caraglia M, Lentini A, Tagliaferri P, Abbruzzese A. Tissue transglutaminase expression affects hypusine metabolism in BALB/c 3T3 cells. FEBS Lett 1998; 437:34-8. [PMID: 9804167 DOI: 10.1016/s0014-5793(98)01191-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Post-translational formation of hypusine in eukaryotic initiation factor 5A (eIF-5A) is essential for cell viability. Recently, we showed that hypusine protein is an in vitro substrate for transglutaminases (TGases). We report the effect of tissue TGase expression on the in vivo hypusine metabolic pathway. The stable expression of tTGase in BALB/c 3T3 cells induced a 100-fold reduction of hypusine levels and a 50% increase of gamma-glutamyl-omega-hypusine formation. Such changes were paralleled by a consistent decrease in the free polyamine pool and an enhancement of their excretion and of the formation of their gamma-glutamyl derivatives. These effects occurred together with a significant reduction of cell proliferation. In this report we suggest, for the first time, that tTGase affects hypusine metabolism, thus regulating the eIF-5A activity and cell proliferation.
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Affiliation(s)
- S Beninati
- Department of Biology, II University of Rome, Tor Vergata, Italy
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38
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Ikura K, Kita K, Fujita I, Hashimoto H, Kawabata N. Identification of amine acceptor protein substrates of transglutaminase in liver extracts: use of 5-(biotinamido) pentylamine as a probe. Arch Biochem Biophys 1998; 356:280-6. [PMID: 9705218 DOI: 10.1006/abbi.1998.0775] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Transglutaminase is a calcium-dependent enzyme which catalyzes amine incorporation and cross-linking of proteins. To isolate the amine acceptor protein substrates of transglutaminase in mammalian livers, a biotin-labeled primary amine substrate of transglutaminase, 5-(biotinamido) pentylamine, was used for biotin labeling of proteins in the liver extracts by endogenous transglutaminase activity. The biotin-labeled proteins were isolated and recovered by biotin-avidin-affinity chromatography. The obtained proteins were separated by SDS-PAGE. Proteins with molecular masses of 15, 24, 35, 40, 44, 93, and 134 kDa were the main components of labeled proteins in mouse liver extract. In rat and guinea pig liver extracts, 32-, 38-, 40-, 44-, and 134-kDa proteins and28-, 40-, 44-, 55-, 60-, 91-, and 134-kDa proteins were the main components of labeled proteins, respectively.Using amino-terminal amino acid sequence analyses and sequence homology searches, the 38-kDa protein from rat liver was identified as a subunit of glyceraldehyde-3-phosphate dehydrogenase (EC 1.2.1.12), and the 28-kDa protein from guinea pig liver was identified as a subunit of glutathione S-transferase (class theta) (EC 2.5.1.18). Both the glyceraldehyde-3-phosphate dehydrogenase from rabbit muscle and glutathione S-transferase (class pi) from human placenta also could be amine acceptors in the amine incorporation catalyzed by guinea pig liver transglutaminase. These results suggest that these enzymes can be modified posttranslationally by cellular transglutaminase.
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Affiliation(s)
- K Ikura
- Faculty of Engineering and Design, Kyoto Institute of Technology, Matsugasaki, Kyoto, 606-8585, Japan.
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39
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Induction of Apoptosis Without Differentiation by Retinoic Acid in PLB-985 Cells Requires the Activation of Both RAR and RXR. Blood 1997. [DOI: 10.1182/blood.v90.9.3345] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractRetinoic acid (RA) induces differentiation, followed by apoptosis in acute promyelocytic leukemia (APL) cells, both in vitro and in patients. One problem in understanding these mechanisms is to distinguish molecular events leading to differentiation from those leading to apoptosis. We have identified a leukemic cell line, PLB-985, where RA directly induces apoptosis with no morphologic, genetic, or cell-surface marker evidence of differentiation. These cells differentiate following dimethyl sulfoxide (DMSO), but not RA, treatment. Two-color flow cytometry showed no alteration of the cell cycle after RA treatment, and cell-surface marker analysis of CD11a, CD11b, and CD13 showed no modulation typical of differentiating cells. RNA expression of myeloblastin and transglutaminase, genes regulated by RA-induced differentiation in NB4 cells, was unchanged by RA treatment. Instead, RA induced apoptosis, as shown by typical apoptotic morphological features, genomic DNA laddering, and positive labeling in the TUNEL assay. We found that induction of apoptosis in this model requires a different pattern of retinoid receptor binding and transcriptional activation than is seen in APL cells. As previously described, treatment with retinoid receptor-selective ligands showed that stimulation of RAR alone is sufficient to induce differentiation and apoptosis in NB4 cells, and that stimulation of RXR has no effect on the parameters analyzed. In PLB-985 cells, on the other hand, apoptosis was induced only upon costimulation of both RAR and RXR. Stimulation of either receptor alone had no effect on the cells. Consistent with these findings, bcl-2 RNA and protein levels were downregulated after stimulation of both RAR and RXR, but not with an RAR-specific ligand alone, as in NB4 cells. The expression of several other bcl-2 family members (bcl-X, ich-1, bax, bag, and bak ) and retinoid receptors (RARα, RXRα, and RXRβ) was not affected by treatment with RAR- and/or RXR-activating retinoids; RARβ RNA was undetectable before and after retinoid treatment. Thus, our cell model provides a useful tool in determining the genetic events mediating apoptosis as a response to RA, unobscured by events implicated in differentiation.
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40
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Lu S, Saydak M, Gentile V, Stein JP, Davies PJ. Isolation and characterization of the human tissue transglutaminase gene promoter. J Biol Chem 1995; 270:9748-56. [PMID: 7730352 DOI: 10.1074/jbc.270.17.9748] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Tissue transglutaminase belongs to a family of calcium-dependent enzymes, the transglutaminases that catalyze the covalent cross-linking of specific proteins by the formation of epsilon (gamma-glutamyl)lysine isopeptide bonds. The goal of this study has been the isolation and characterization of the human tissue transglutaminase gene promoter. Genomic DNA clones, spanning the 5' region of the gene, were isolated and the structure of the 5'-end of the human tissue transglutaminase gene was determined. 1.74 kilobases of flanking DNA were sequenced and were found to contain a TATA box element (TATAA), a CAAT box element (GGACAAT), a series of potential transcription factor-binding sites (AP1, SP1, interleukin-6 response element), and a glucocorticoid response elements. Transient transfection experiments showed that this DNA fragment included a functional promoter, which is constitutively active in multiple cell types.
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Affiliation(s)
- S Lu
- Department of Pharmacology, University of Texas Medical School, Houston 77225, USA
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41
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Duvic M, Nelson DC, Annarella M, Cho M, Esgleyes-Ribot T, Remenyik E, Ulmer R, Rapini RP, Sacks PG, Clayman GL. Keratinocyte transglutaminase expression varies in squamous cell carcinomas. J Invest Dermatol 1994; 102:462-9. [PMID: 7908683 DOI: 10.1111/1523-1747.ep12373021] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Type I transglutaminase (TGase I, keratinocyte or particulate transglutaminase) is a 92-kilodalton (kDa) protein expressed in abundance in cultured keratinocytes and in the hyperproliferative skin disorder psoriasis. To determine the expression of TGase I protein and mRNA, we studied tissue and established squamous carcinoma lines derived from different sources. Immunohistochemistry and Western blotting were used to detect TGase I protein with the B.C1 mouse monoclonal antibody. Only well-differentiated, skin-derived squamous carcinomas stained for TGase I. However, a precocious pattern of expression was seen overlying less-differentiated tumors. Compared to cultured human keratinocytes, squamous cell carcinoma (SCC) had many times less to 7.8 times more TGase I protein, greatest in the two most differentiated tumor lines 14-83 and ME-180. TGase I mRNA levels ranged from 0.010 to 0.00004 pg/microgram total RNA by reverse transcriptase-polymerase chain reaction using an internal standard. Protein expression correlated with mRNA levels in most SCC lines. When a human TGase I promoter was isolated and used to study genomic DNA, SCC1-83 was shown to have unique restriction enzyme fragments, including one indicative of methylation differences, also present within DNA from the KB line. These studies suggest that transcriptional control of TGase I gene expression in squamous carcinomas may be influenced both by cis elements in the promoter and by the degree of tumor squamous differentiation.
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Affiliation(s)
- M Duvic
- Department of Dermatology, University of Texas Medical School at Houston 77030
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42
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Suto N, Ikura K, Sasaki R. Expression induced by interleukin-6 of tissue-type transglutaminase in human hepatoblastoma HepG2 cells. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)53198-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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43
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Bratton D. Release of platelet activation factor from activated neutrophils. Transglutaminase-dependent enhancement of transbilayer movement across the plasma membrane. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)53703-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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44
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Schroeder WT, Thacher SM, Stewart-Galetka S, Annarella M, Chema D, Siciliano MJ, Davies PJ, Tang HY, Sowa BA, Duvic M. Type I Keratinocyte Transglutaminase: Expression in Human Skin and Psoriasis. J Invest Dermatol 1992; 99:27-34. [PMID: 1351505 DOI: 10.1111/1523-1747.ep12611394] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A 92-kD transglutaminase (TGase K), expressed in human cultured keratinocytes and stratum corneum, catalyzes a critical step in the formation of the cornified envelope of terminal differentiation. A rabbit polyclonal antibody to TGase K was used to isolate overlapping cDNA clones from a human keratinocyte cDNA expression library. The cDNA clones were sequenced and unequivocally identified as TGase K by comparison to the N-terminal amino acid sequences of two cyanogen bromide fragments from the purified enzyme. The mRNA for Tgase K is expressed in cultured keratinocytes but not in A431 squamous carcinoma cells, in fibroblasts, or in other non-epithelial tissues and cells. Although TGase K protein expression is limited to the upper layers of normal epidermis, the mRNA is generally present throughout the epidermis, suggesting the possibility of post-transcriptional regulation. Precocious expression of TGase K protein occurs in psoriasis, and quantitative Northern blot analysis of TGase K mRNA from normal and involved epidermal biopsies from psoriasis patients suggests that TGase K mRNA levels are increased in psoriatic lesions. By using quantitative laser scanning confocal microscopy (LSCM) and in situ hybridization, the increase of the TGase K mRNA was in the range of 3-7 times in the psoriatic epidermis and was significantly higher compared with normal skin and with paired adjacent skin. Quantitative LSCM provides a powerful and direct method for analysis of gene expression in skin.
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Affiliation(s)
- W T Schroeder
- Department of Dermatology, University of Texas Medical School, Houston 77030
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45
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Seiving B, Ohlsson K, Linder C, Stenberg P. Transglutaminase differentiation during maturation of human blood monocytes to macrophages. Eur J Haematol 1991; 46:263-71. [PMID: 1675177 DOI: 10.1111/j.1600-0609.1991.tb01537.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
There are divergent reports in the literature on the character of transglutaminases in monocytes and macrophages. The aim of the present study was to further elucidate the characteristics and functions of various transglutaminases in monocytes and macrophages. Peripheral human blood monocytes were plated and cultured for up to a month and examined for transglutaminase. Freshly prepared monocytes contained cellular Factor XIII only. Successively during culturing, the monocytes matured into macrophages. Cellular Factor XIII correspondingly disappeared and tissue transglutaminase increased during the same time. After approximately 2 weeks in culture only tissue transglutaminase was detected and this remained for the rest of the culturing period. The tissue transglutaminase content was induced by addition of 2 mumols/l retinoic acid. Addition of retinoic acid was not critical for transglutaminase differentiation. Transglutaminase could be associated with phagocytosis of 125I-trypsin-alpha 2-macroglobulin complexes. The phagocytotic capacity of monocytes was approximately 1/4 compared to macrophages cultured for 14 days. Phagocytosis was measured as cellular complex degradation to monoiodo-tyrosine, released to the culture medium. The monocytes and macrophages were incubated at 4 degrees C and 37 degrees C, with and without addition of the transglutaminase inhibitor monodansylthiacadaverine. Addition of 100 mumols/l monodansylthia-cadaverine caused approximately 2/3 inhibition of phagocytosis. These results suggest that transglutaminase differentiates from cellular Factor XIII into tissue type transglutaminase during maturation of monocytes into macrophages and that the differentiation is associated with transglutaminase-dependent phagocytosis.
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Affiliation(s)
- B Seiving
- Hospital Pharmacy, Malmö General Hospital, Sweden
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46
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Abstract
A new solid-phase micro assay for transglutaminase has been developed. Casein bound to microtitre plates and biotin-labelled casein were used as substrates in a transglutaminase-dependent cross-linking reaction. The resulting immobilized biotin was visualized by addition of avidin-labelled alkaline phosphatase followed by p-nitrophenyl phosphate. The colour development was monitored at 405 nm. Tissue transglutaminase was used as test enzyme. The method was also applied to normal and Factor XIII-deficient plasma.
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Affiliation(s)
- B Seiving
- Hospital Pharmacy, Malmö General Hospital, Sweden
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47
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Isolation and characterization of cDNA clones to mouse macrophage and human endothelial cell tissue transglutaminases. J Biol Chem 1991. [DOI: 10.1016/s0021-9258(18)52460-1] [Citation(s) in RCA: 175] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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48
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Ikura K, Suto N, Sasaki R. Activity and gene expression of transglutaminase in guinea pig liver during the postnatal growing phase. FEBS Lett 1990; 268:203-5. [PMID: 1974519 DOI: 10.1016/0014-5793(90)81008-c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
During the postnatal growing phase from birth to 7 weeks old, the cytosolic transglutaminase activity of guinea pig liver increased 3.8-fold. The enzyme activity in the particulate fraction increased slightly. Immunoblot analyses showed that the postnatal increase in the activity was correlated with in increase in the enzyme protein. The quantity of mRNA of the liver transglutaminase did not change significantly during the postnatal growing phase examined. These results indicated that transglutaminase may be involved in the postnatal development of guinea pig liver and that the amount of transglutaminase in the postnatal liver may be controlled post-transcriptionally.
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Affiliation(s)
- K Ikura
- Department of Food Science and Technology, Faculty of Agriculture, Kyoto University, Japan
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49
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Ikura K, Tsuchiya Y, Sasaki R, Chiba H. Expression of guinea-pig liver transglutaminase cDNA in Escherichia coli. Amino-terminal N alpha-acetyl group is not essential for catalytic function of transglutaminase. EUROPEAN JOURNAL OF BIOCHEMISTRY 1990; 187:705-11. [PMID: 1968007 DOI: 10.1111/j.1432-1033.1990.tb15357.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Transglutaminases (EC 2.3.2.13) catalyze the formation of epsilon-(gamma-glutamyl)lysine cross-links and the substitution of a variety of primary amines for the gamma-carboxamide groups of protein-bound glutamine residues. These enzymes are involved in many biological phenomena. Transglutaminase reactions also have been shown to be suitable for applied enzymology. In this study, as a first step of studies to elucidate the structure/function relationship of transglutaminase, we constructed an expression plasmid, pKTG1, containing a cDNA of guinea-pig liver transglutaminase between the NcoI and PstI sites of an expression vector, pKK233-2, and produced the liver transglutaminase as an unfused protein in Escherichia coli. The purified recombinant enzyme was indistinguishable from natural liver transglutaminase in some structural properties such as molecular mass, amino acid composition, and amino- and carboxyl-terminal sequences. However, the alpha-amino group of the amino-terminal alanine residue of the recombinant transglutaminase was not acetylated as was that of the natural enzyme. Comparison of the recombinant enzyme with the natural one did not indicate significant differences in specific activity and apparent Km values for substrates in the histamine incorporation into acetyl alpha s1-casein. The sensitivity to activation by Ca2+ and the rate of catalyzed protein cross-linking were also similar between recombinant and natural transglutaminases. These results indicated that the N alpha-acetyl group in natural liver transglutaminase has not a particular role in the catalytic function of this enzyme.
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Affiliation(s)
- K Ikura
- Department of Food Science and Technology, Faculty of Agriculture, Kyoto University, Japan
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50
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Salaman MR, Robinson J, Rampling MW. Tuberculin sensitivity and an interaction of leucocyte and plasma factors involving fibrinogen. TUBERCLE 1989; 70:193-9. [PMID: 2617694 DOI: 10.1016/0041-3879(89)90050-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Lysates of blood leucocytes from strong tuberculin-positive reactors contained smaller particles of insoluble protein-rich material than did similar preparations from negative donors. The phenomenon was dependent on the presence of small quantities of plasma in the original leucocyte suspensions: when this was removed or replaced by serum both groups of donors produced particles of the smaller size. When the experiments were repeated in the presence of 125I-fibrinogen, larger particle size was found to be associated with an increased proportion of radioactivity becoming firmly bound to the insoluble material. These findings are likely to reflect differences in the levels of procoagulant, proteolytic enzymes or associated activities in the cells or plasma of the two groups.
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Affiliation(s)
- M R Salaman
- Department of Immunology, St. Mary's Hospital Medical School, London, UK
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