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Bülck C, Nyström EE, Koudelka T, Mannbar-Frahm M, Andresen G, Radhouani M, Tran F, Scharfenberg F, Schrell F, Armbrust F, Dahlke E, Zhao B, Vervaeke A, Theilig F, Rosenstiel P, Starkl P, Rosshart SP, Fickenscher H, Tholey A, Hansson GC, Becker-Pauly C. Proteolytic processing of galectin-3 by meprin metalloproteases is crucial for host-microbiome homeostasis. SCIENCE ADVANCES 2023; 9:eadf4055. [PMID: 37000885 PMCID: PMC10065446 DOI: 10.1126/sciadv.adf4055] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 03/02/2023] [Indexed: 06/19/2023]
Abstract
The metalloproteases meprin α and meprin β are highly expressed in the healthy gut but significantly decreased in inflammatory bowel disease, implicating a protective role in mucosal homeostasis. In the colon, meprin α and meprin β form covalently linked heterodimers tethering meprin α to the plasma membrane, therefore presenting dual proteolytic activity in a unique enzyme complex. To unravel its function, we applied N-terminomics and identified galectin-3 as the major intestinal substrate for meprin α/β heterodimers. Galectin-3-deficient and meprin α/β double knockout mice show similar alterations in their microbiome in comparison to wild-type mice. We further demonstrate that meprin α/β heterodimers differentially process galectin-3 upon bacterial infection, in germ-free, conventionally housed (specific pathogen-free), or wildling mice, which in turn regulates the bacterial agglutination properties of galectin-3. Thus, the constitutive cleavage of galectin-3 by meprin α/β heterodimers may play a key role in colon host-microbiome homeostasis.
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Affiliation(s)
- Cynthia Bülck
- Institute of Biochemistry, University of Kiel, 24118 Kiel, Germany
| | | | - Tomas Koudelka
- Institute of Experimental Medicine, University of Kiel, 24188 Kiel, Germany
| | - Michael Mannbar-Frahm
- Institute of Infection Medicine, University of Kiel and University Medical Center Schleswig-Holstein, 24015 Kiel, Germany
| | - Gerrit Andresen
- Institute of Infection Medicine, University of Kiel and University Medical Center Schleswig-Holstein, 24015 Kiel, Germany
| | - Mariem Radhouani
- Division of Infection Biology, Department of Medicine I, Medical University of Vienna, 1090 Vienna, Austria
| | - Florian Tran
- Institute of Clinical Molecular Biology, Kiel University and University Medical Center Schleswig-Holstein, 24105 Kiel, Germany
| | | | | | - Fred Armbrust
- Institute of Biochemistry, University of Kiel, 24118 Kiel, Germany
| | - Eileen Dahlke
- Institute of Anatomy, University of Kiel, 24118 Kiel, Germany
| | - Bei Zhao
- Department of Microbiome Research, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, Germany
| | - Alex Vervaeke
- Division of Infection Biology, Department of Medicine I, Medical University of Vienna, 1090 Vienna, Austria
| | | | - Philip Rosenstiel
- Institute of Clinical Molecular Biology, Kiel University and University Medical Center Schleswig-Holstein, 24105 Kiel, Germany
| | - Philipp Starkl
- Division of Infection Biology, Department of Medicine I, Medical University of Vienna, 1090 Vienna, Austria
| | - Stephan P. Rosshart
- Department of Microbiome Research, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, Germany
- Department of Medicine II (Gastroenterology, Hepatology, Endocrinology, and Infectious Diseases), Medical Center–University of Freiburg, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Helmut Fickenscher
- Institute of Infection Medicine, University of Kiel and University Medical Center Schleswig-Holstein, 24015 Kiel, Germany
| | - Andreas Tholey
- Institute of Experimental Medicine, University of Kiel, 24188 Kiel, Germany
| | - Gunnar C. Hansson
- Department of Medical Biochemistry and Cell Biology, University of Gothenburg, 405 30 Gothenburg, Sweden
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Overduin M, Tran A, Eekels DM, Overduin F, Kervin TA. Transmembrane Membrane Readers form a Novel Class of Proteins That Include Peripheral Phosphoinositide Recognition Domains and Viral Spikes. MEMBRANES 2022; 12:1161. [PMID: 36422153 PMCID: PMC9692390 DOI: 10.3390/membranes12111161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 11/11/2022] [Accepted: 11/15/2022] [Indexed: 06/16/2023]
Abstract
Membrane proteins are broadly classified as transmembrane (TM) or peripheral, with functions that pertain to only a single bilayer at a given time. Here, we explicate a class of proteins that contain both transmembrane and peripheral domains, which we dub transmembrane membrane readers (TMMRs). Their transmembrane and peripheral elements anchor them to one bilayer and reversibly attach them to another section of bilayer, respectively, positioning them to tether and fuse membranes while recognizing signals such as phosphoinositides (PIs) and modifying lipid chemistries in proximity to their transmembrane domains. Here, we analyze full-length models from AlphaFold2 and Rosetta, as well as structures from nuclear magnetic resonance (NMR) spectroscopy and X-ray crystallography, using the Membrane Optimal Docking Area (MODA) program to map their membrane-binding surfaces. Eukaryotic TMMRs include phospholipid-binding C1, C2, CRAL-TRIO, FYVE, GRAM, GTPase, MATH, PDZ, PH, PX, SMP, StART and WD domains within proteins including protrudin, sorting nexins and synaptotagmins. The spike proteins of SARS-CoV-2 as well as other viruses are also TMMRs, seeing as they are anchored into the viral membrane while mediating fusion with host cell membranes. As such, TMMRs have key roles in cell biology and membrane trafficking, and include drug targets for diseases such as COVID-19.
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Affiliation(s)
- Michael Overduin
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada
| | - Anh Tran
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada
| | | | - Finn Overduin
- Institute of Nutritional Science, University of Potsdam, 14476 Potsdam, Germany
| | - Troy A. Kervin
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada
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3
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Bayly-Jones C, Lupton CJ, Fritz C, Venugopal H, Ramsbeck D, Wermann M, Jäger C, de Marco A, Schilling S, Schlenzig D, Whisstock JC. Helical ultrastructure of the metalloprotease meprin α in complex with a small molecule inhibitor. Nat Commun 2022; 13:6178. [PMID: 36261433 PMCID: PMC9581967 DOI: 10.1038/s41467-022-33893-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 09/30/2022] [Indexed: 12/24/2022] Open
Abstract
The zinc-dependent metalloprotease meprin α is predominantly expressed in the brush border membrane of proximal tubules in the kidney and enterocytes in the small intestine and colon. In normal tissue homeostasis meprin α performs key roles in inflammation, immunity, and extracellular matrix remodelling. Dysregulated meprin α is associated with acute kidney injury, sepsis, urinary tract infection, metastatic colorectal carcinoma, and inflammatory bowel disease. Accordingly, meprin α is the target of drug discovery programs. In contrast to meprin β, meprin α is secreted into the extracellular space, whereupon it oligomerises to form giant assemblies and is the largest extracellular protease identified to date (~6 MDa). Here, using cryo-electron microscopy, we determine the high-resolution structure of the zymogen and mature form of meprin α, as well as the structure of the active form in complex with a prototype small molecule inhibitor and human fetuin-B. Our data reveal that meprin α forms a giant, flexible, left-handed helical assembly of roughly 22 nm in diameter. We find that oligomerisation improves proteolytic and thermal stability but does not impact substrate specificity or enzymatic activity. Furthermore, structural comparison with meprin β reveal unique features of the active site of meprin α, and helical assembly more broadly.
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Affiliation(s)
- Charles Bayly-Jones
- grid.1002.30000 0004 1936 7857Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC Australia ,grid.1002.30000 0004 1936 7857ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Melbourne, VIC Australia
| | - Christopher J. Lupton
- grid.1002.30000 0004 1936 7857Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC Australia ,grid.1002.30000 0004 1936 7857ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Melbourne, VIC Australia
| | - Claudia Fritz
- grid.418008.50000 0004 0494 3022Department for Drug Design and Target Validation (IZI-MWT), Fraunhofer Institute for Cell Therapy and Immunology, Halle, Germany
| | - Hariprasad Venugopal
- grid.1002.30000 0004 1936 7857Ramaciotti Centre for Cryo-Electron Microscopy, Monash University, Clayton, 3800 VIC Australia
| | - Daniel Ramsbeck
- grid.418008.50000 0004 0494 3022Department for Drug Design and Target Validation (IZI-MWT), Fraunhofer Institute for Cell Therapy and Immunology, Halle, Germany
| | - Michael Wermann
- grid.418008.50000 0004 0494 3022Department for Drug Design and Target Validation (IZI-MWT), Fraunhofer Institute for Cell Therapy and Immunology, Halle, Germany
| | | | - Alex de Marco
- grid.1002.30000 0004 1936 7857Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC Australia ,grid.1002.30000 0004 1936 7857ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Melbourne, VIC Australia
| | - Stephan Schilling
- grid.418008.50000 0004 0494 3022Department for Drug Design and Target Validation (IZI-MWT), Fraunhofer Institute for Cell Therapy and Immunology, Halle, Germany ,grid.427932.90000 0001 0692 3664Hochschule Anhalt, University of Applied Sciences, Köthen, Germany
| | - Dagmar Schlenzig
- grid.418008.50000 0004 0494 3022Department for Drug Design and Target Validation (IZI-MWT), Fraunhofer Institute for Cell Therapy and Immunology, Halle, Germany
| | - James C. Whisstock
- grid.1002.30000 0004 1936 7857Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC Australia ,grid.1002.30000 0004 1936 7857ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Melbourne, VIC Australia ,grid.1002.30000 0004 1936 7857EMBL Australia, Monash University, Melbourne, VIC 3800 Australia ,grid.1001.00000 0001 2180 7477ACRF Department of Cancer Biology and Therapeutics, John Curtin School of Medical Research, Australian National University, Canberra, ACT 2601 Australia
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Regulation of meprin metalloproteases in mucosal homeostasis. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2021; 1869:119158. [PMID: 34626680 DOI: 10.1016/j.bbamcr.2021.119158] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 09/15/2021] [Accepted: 09/20/2021] [Indexed: 12/20/2022]
Abstract
Mucus is covering the entire epithelium of the gastrointestinal tract (GIT), building the interface for the symbiosis between microorganisms and their host. Hence, a disrupted mucosal barrier or alterations of proper mucus composition, including the gut microbiota, can cause severe infection and inflammation. Meprin metalloproteases are well-known to cleave various pro-inflammatory molecules, contributing to the onset and progression of pathological conditions including sepsis, pulmonary hypertension or inflammatory bowel disease (IBD). Moreover, meprins have an impact on migration and infiltration of immune cells like monocytes or leukocytes during intestinal inflammation by cleaving tight junction proteins or cell adhesion molecules, thereby disrupting epithelial cell barrier and promoting transendothelial cell migration. Interestingly, both meprin α and meprin β are susceptibility genes for IBD. However, both genes are significantly downregulated in inflamed intestinal tissue in contrast to healthy donors. Therefore, a detailed understanding of the underlying molecular mechanisms is the basis for developing new and effective therapies against manifold pathologies like IBD. This review focuses on the regulation of meprin metalloproteases and its impact on physiological and pathological conditions related to mucosal homeostasis.
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Armbrust F, Bickenbach K, Koudelka T, Tholey A, Pietrzik C, Becker-Pauly C. Phosphorylation of meprin β controls its cell surface abundance and subsequently diminishes ectodomain shedding. FASEB J 2021; 35:e21677. [PMID: 34125978 DOI: 10.1096/fj.202100271r] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 04/24/2021] [Accepted: 05/04/2021] [Indexed: 12/18/2022]
Abstract
Meprin β is a zinc-dependent metalloprotease exhibiting a unique cleavage specificity with strong preference for acidic amino acids at the cleavage site. Proteomic studies revealed a diverse substrate pool of meprin β including the interleukin-6 receptor (IL-6R) and the amyloid precursor protein (APP). Dysregulation of meprin β is often associated with pathological conditions such as chronic inflammation, fibrosis, or Alzheimer's disease (AD). The extracellular regulation of meprin β including interactors, sheddases, and activators has been intensively investigated while intracellular regulation has been barely addressed in the literature. This study aimed to analyze C-terminal phosphorylation of meprin β with regard to cell surface expression and proteolytic activity. By immunoprecipitation of endogenous meprin β from the colon cancer cell line Colo320 and subsequent LC-MS analysis, we identified several phosphorylation sites in its C-terminal region. Here, T694 in the C-terminus of meprin β was the most preferred residue after phorbol 12-myristate 13-acetate (PMA) stimulation. We further demonstrated the role of protein kinase C (PKC) isoforms for meprin β phosphorylation and identified the involvement of PKC-α and PKC-β. As a result of phosphorylation, the meprin β activity at the cell surface is reduced and, consequently, the extent of substrate cleavage is diminished. Our data indicate that this decrease of the surface activity is caused by the internalization and degradation of meprin β.
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Affiliation(s)
- Fred Armbrust
- Biochemical Institute, Unit for Degradomics of the Protease Web, University of Kiel, Kiel, Germany
| | - Kira Bickenbach
- Biochemical Institute, Unit for Degradomics of the Protease Web, University of Kiel, Kiel, Germany
| | - Tomas Koudelka
- Systematic Proteomics & Bioanalytics, Institute for Experimental Medicine, University of Kiel, Kiel, Germany
| | - Andreas Tholey
- Systematic Proteomics & Bioanalytics, Institute for Experimental Medicine, University of Kiel, Kiel, Germany
| | - Claus Pietrzik
- Institute for Pathobiochemistry, University Medical Center of the Johannes Gutenberg-University Mainz, Mainz, Germany
| | - Christoph Becker-Pauly
- Biochemical Institute, Unit for Degradomics of the Protease Web, University of Kiel, Kiel, Germany
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Structure and Dynamics of Meprin β in Complex with a Hydroxamate-Based Inhibitor. Int J Mol Sci 2021; 22:ijms22115651. [PMID: 34073350 PMCID: PMC8197800 DOI: 10.3390/ijms22115651] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 05/21/2021] [Accepted: 05/21/2021] [Indexed: 11/17/2022] Open
Abstract
The astacin protease Meprin β represents an emerging target for drug development due to its potential involvement in disorders such as acute and chronic kidney injury and fibrosis. Here, we elaborate on the structural basis of inhibition by a specific Meprin β inhibitor. Our analysis of the crystal structure suggests different binding modes of the inhibitor to the active site. This flexibility is caused, at least in part, by movement of the C-terminal region of the protease domain (CTD). The CTD movement narrows the active site cleft upon inhibitor binding. Compared with other astacin proteases, among these the highly homologous isoenzyme Meprin α, differences in the subsites account for the unique selectivity of the inhibitor. Although the inhibitor shows substantial flexibility in orientation within the active site, the structural data as well as binding analyses, including molecular dynamics simulations, support a contribution of electrostatic interactions, presumably by arginine residues, to binding and specificity. Collectively, the results presented here and previously support an induced fit and substantial movement of the CTD upon ligand binding and, possibly, during catalysis. To the best of our knowledge, we here present the first structure of a Meprin β holoenzyme containing a zinc ion and a specific inhibitor bound to the active site. The structural data will guide rational drug design and the discovery of highly potent Meprin inhibitors.
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7
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Bond JS. To be there when the picture is being painted. J Biol Chem 2020; 295:15957-15973. [PMID: 33219166 DOI: 10.1074/jbc.x120.016150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
There is nothing quite like the excitement of discovery in science-of finding something no one else knew and seeing a story unfold. One has to be part of an emerging picture to feel the elation. These moments in a lifetime are few and far between, but they fuel enthusiasm and keep one going. They are embedded in struggles and joys of everyday life, years of establishing what Louis Pasteur called "the prepared mind," working with mentors, trainees, and colleagues, failures and successes. This article recalls 1) how I got to be a biochemist; 2) my contributions as an educator and researcher, especially regarding meprin metalloproteases; and 3) my participation in communities of science. Perhaps my reflections will help an aspiring scientist see how fulfilling a career in science can be.
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Affiliation(s)
- Judith S Bond
- Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, North Carolina, USA
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8
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Gao R, Liu D, Guo W, Ge W, Fan T, Li B, Gao P, Liu B, Zheng Y, Wang J. Meprin-α (Mep1A) enhances TNF-α secretion by mast cells and aggravates abdominal aortic aneurysms. Br J Pharmacol 2020; 177:2872-2885. [PMID: 32072633 DOI: 10.1111/bph.15019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 01/03/2020] [Accepted: 01/29/2020] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND AND PURPOSE Abdominal aorticaneurysm (AAA) rupture is mainly due to elastic lamina degradation. As a metalloendopeptidase, meprin-α (Mep1A) critically modulates the activity of proteins and inflammatory cytokines in various diseases. Here, we sought to investigate the functional role of Mep1A in AAA formation and rupture. EXPERIMENTAL APPROACH AAA tissues were detected by using real-time PCR (RT-PCR), western blotting (WB), and immunohistochemistry. Further mechanistic studies used RT-PCR, WB, and enzyme-linked immunosorbent assays. KEY RESULTS Mep1A mediated AAA formation by regulating the mast cell (MC) secretion of TNF-α, which promoted matrix metalloproteinase (MMP) expression and apoptosis in smooth muscle cells (SMCs). Importantly, increased Mep1A expression was found in human AAA tissues and in angiotensin II-induced mouse AAA tissues. Mep1A deficiency reduced AAA formation and increased the survival rate of AAA mice. Pathological analysis showed that Mep1A deletion decreased elastic lamina degradation and SMC apoptosis in AAA tissues. Furthermore, Mep1A was expressed mainly in MCs, wherein it mediated TNF-α expression. Mep1A inhibitor actinonin significantly inhibited TNF-α secretion in MCs. TNF-α secreted by MCs enhanced MMP2 expression in SMCs and promoted SMC apoptosis. CONCLUSION AND IMPLICATIONS Taken together, these data suggest that Mep1A may be vital in AAA pathophysiology by regulating TNF-α production by MCs. Knocking out Mep1A significantly decreased AAA diameter and improved AAA stability in mice. Therefore, Mep1A is a potential new therapeutic target in the development of AAA.
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Affiliation(s)
- Ran Gao
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Department of Pathophysiology, Peking Union Medical College, Beijing, China
| | - Duan Liu
- Peking Union Medical College Hospital, Beijing, China
| | - Wenjun Guo
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Department of Pathophysiology, Peking Union Medical College, Beijing, China
| | - Weipeng Ge
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Department of Pathophysiology, Peking Union Medical College, Beijing, China
| | - Tianfei Fan
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Department of Pathophysiology, Peking Union Medical College, Beijing, China
| | - Bolun Li
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Department of Pathophysiology, Peking Union Medical College, Beijing, China
| | - Pan Gao
- Department of Geriatrics, Southwest Hospital, The First Affiliated Hospital to Army Medical University, Chongqing, China
| | - Bin Liu
- Aab Cardiovascular Research Institute, University of Rochester, Rochester, USA
| | - Yuehong Zheng
- Peking Union Medical College Hospital, Beijing, China
| | - Jing Wang
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Department of Pathophysiology, Peking Union Medical College, Beijing, China
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Abstract
A crucial step for tumor cell extravasation and metastasis is the migration through the extracellular matrix, which requires proteolytic activity. Hence, proteases, particularly matrix metalloproteases (MMPs), have been discussed as therapeutic targets and their inhibition should diminish tumor growth and metastasis. The metalloproteases meprin α and meprin β are highly abundant on intestinal enterocytes and their expression was associated with different stages of colorectal cancer. Due to their ability to cleave extracellular matrix (ECM) components, they were suggested as pro-tumorigenic enzymes. Additionally, both meprins were shown to have pro-inflammatory activity by cleaving cytokines and their receptors, which correlates with chronic intestinal inflammation and associated conditions. On the other hand, meprin β was identified as an essential enzyme for the detachment and renewal of the intestinal mucus, important to prevent bacterial overgrowth and infection. Considering this, it is hard to estimate whether high activity of meprins is generally detrimental or if these enzymes have also protective functions in certain cancer types. For instance, for colorectal cancer, patients with high meprin β expression in tumor tissue exhibit a better survival prognosis, which is completely different to prostate cancer. This demonstrates that the very same enzyme may have contrary effects on tumor initiation and growth, depending on its tissue and subcellular localization. Hence, precise knowledge about proteolytic enzymes is required to design the most efficient therapeutic options for cancer treatment. In this review, we summarize the current findings on meprins' functions, expression, and cancer-associated variants with possible implications for tumor progression and metastasis.
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Abstract
The Journal of Biological Chemistry (JBC) has been a major vehicle for disseminating and recording the discovery and characterization of proteolytic enzymes. The pace of discovery in the protease field accelerated during the 1971-2010 period that Dr. Herb Tabor served as the JBC's editor-in-chief. When he began his tenure, the fine structure and kinetics of only a few proteases were known; now thousands of proteases have been characterized, and over 600 genes for proteases have been identified in the human genome. In this review, besides reflecting on Dr. Tabor's invaluable contributions to the JBC and the American Society for Biochemistry and Molecular Biology (ASBMB), I endeavor to provide an overview of the extensive history of protease research, highlighting a few discoveries and roles of proteases in vivo In addition, metalloproteinases, particularly meprins of the astacin family, will be discussed with regard to structural characteristics, regulation, mechanisms of action, and roles in health and disease. Proteases and protein degradation play crucial roles in living systems, and I briefly address future directions in this highly diverse and thriving research area.
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Affiliation(s)
- Judith S Bond
- Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, North Carolina 27599.
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Peters F, Scharfenberg F, Colmorgen C, Armbrust F, Wichert R, Arnold P, Potempa B, Potempa J, Pietrzik CU, Häsler R, Rosenstiel P, Becker-Pauly C. Tethering soluble meprin α in an enzyme complex to the cell surface affects IBD-associated genes. FASEB J 2019; 33:7490-7504. [PMID: 30916990 DOI: 10.1096/fj.201802391r] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Biologic activity of proteases is mainly characterized by the substrate specificity, tissue distribution, and cellular localization. The human metalloproteases meprin α and meprin β share 41% sequence identity and exhibit a similar cleavage specificity with a preference for negatively charged amino acids. However, shedding of meprin α by furin on the secretory pathway makes it a secreted enzyme in comparison with the membrane-bound meprin β. In this study, we identified human meprin α and meprin β as forming covalently linked membrane-tethered heterodimers in the early endoplasmic reticulum, thereby preventing furin-mediated secretion of meprin α. Within this newly formed enzyme complex, meprin α was able to be activated on the cell surface and detected by cleavage of a novel specific fluorogenic peptide substrate. However, the known meprin β substrates amyloid precursor protein and CD99 were not shed by membrane-tethered meprin α. On the other hand, being linked to meprin α, activation of or substrate cleavage by meprin β on the cell surface was not altered. Interestingly, proteolytic activity of both proteases was increased in the heteromeric complex, indicating an increased proteolytic potential at the plasma membrane. Because meprins are susceptibility genes for inflammatory bowel disease (IBD), and to investigate the physiologic impact of the enzyme complex, we performed transcriptome analyses of intestinal mucosa from meprin-knockout mice. Comparison of the transcriptional gene analysis data with gene analyses of IBD patients revealed that different gene subsets were dysregulated if meprin α was expressed alone or in the enzyme complex, demonstrating the physiologic and pathophysiological relevance of the meprin heterodimer formation.-Peters, F., Scharfenberg, F., Colmorgen, C., Armbrust, F., Wichert, R., Arnold, P., Potempa, B., Potempa, J., Pietrzik, C. U., Häsler, R., Rosenstiel, P., Becker-Pauly, C. Tethering soluble meprin α in an enzyme complex to the cell surface affects IBD-associated genes.
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Affiliation(s)
- Florian Peters
- Unit for Degradomics of the Protease Web, Biochemical Institute, University of Kiel, Kiel, Germany
| | - Franka Scharfenberg
- Unit for Degradomics of the Protease Web, Biochemical Institute, University of Kiel, Kiel, Germany
| | - Cynthia Colmorgen
- Unit for Degradomics of the Protease Web, Biochemical Institute, University of Kiel, Kiel, Germany
| | - Fred Armbrust
- Unit for Degradomics of the Protease Web, Biochemical Institute, University of Kiel, Kiel, Germany
| | - Rielana Wichert
- Unit for Degradomics of the Protease Web, Biochemical Institute, University of Kiel, Kiel, Germany
| | | | - Barbara Potempa
- Department of Microbiology, Faculty of Biochemistry, Biophysics, and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Jan Potempa
- Department of Microbiology, Faculty of Biochemistry, Biophysics, and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Claus U Pietrzik
- Institute of Pathobiochemistry, University Medical Center of Mainz, Mainz, Germany
| | - Robert Häsler
- Institute of Clinical Molecular Biology, University of Kiel, Kiel, Germany
| | - Philip Rosenstiel
- Institute of Clinical Molecular Biology, University of Kiel, Kiel, Germany
| | - Christoph Becker-Pauly
- Unit for Degradomics of the Protease Web, Biochemical Institute, University of Kiel, Kiel, Germany
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12
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Herzog C, Haun RS, Kaushal GP. Role of meprin metalloproteinases in cytokine processing and inflammation. Cytokine 2018; 114:18-25. [PMID: 30580156 DOI: 10.1016/j.cyto.2018.11.032] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 11/16/2018] [Accepted: 11/25/2018] [Indexed: 11/15/2022]
Abstract
Meprin metalloendopeptidases, comprising α and β isoforms, are widely expressed in mammalian cells and organs including kidney, intestines, lungs, skin, and bladder, and in a variety of immune cells and cancer cells. Meprins proteolytically process many inflammatory mediators, including cytokines, chemokines, and other bioactive proteins and peptides that control the function of immune cells. The knowledge of meprin-mediated processing of inflammatory mediators and other target substrates provides a pathophysiologic link for the involvement of meprins in the pathogenesis of many inflammatory disorders. Meprins are now known to play important roles in inflammatory diseases including acute kidney injury, sepsis, urinary tract infections, bladder inflammation, and inflammatory bowel disease. The proteolysis of epithelial and endothelial barriers including cell junctional proteins by meprins promotes leukocyte influx into areas of tissue damage to result in inflammation. Meprins degrade extracellular matrix proteins; this ability of meprins is implicated in the cell migration of leukocytes and the invasion of tumor cells that express meprins. Proteolytic processing and maturation of procollagens provides evidence that meprins are involved in collagen maturation and deposition in the fibrotic processes involved in the formation of keloids and hypertrophic scars and lung fibrosis. This review highlights recent progress in understanding the role of meprins in inflammatory disorders in both human and mouse models.
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Affiliation(s)
- Christian Herzog
- Central Arkansas Veterans Healthcare System and University of Arkansas for Medical Sciences, Department of Internal Medicine, Little Rock, AR, USA
| | - Randy S Haun
- Central Arkansas Veterans Healthcare System and University of Arkansas for Medical Sciences, Department of Pharmaceutical Sciences, Little Rock, AR, USA
| | - Gur P Kaushal
- Central Arkansas Veterans Healthcare System and University of Arkansas for Medical Sciences, Department of Internal Medicine, Little Rock, AR, USA; Central Arkansas Veterans Healthcare System and University of Arkansas for Medical Sciences, Department of Biochemistry, Little Rock, AR, USA.
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13
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Arseni L, Lombardi A, Orioli D. From Structure to Phenotype: Impact of Collagen Alterations on Human Health. Int J Mol Sci 2018; 19:ijms19051407. [PMID: 29738498 PMCID: PMC5983607 DOI: 10.3390/ijms19051407] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Revised: 04/29/2018] [Accepted: 05/04/2018] [Indexed: 01/04/2023] Open
Abstract
The extracellular matrix (ECM) is a highly dynamic and heterogeneous structure that plays multiple roles in living organisms. Its integrity and homeostasis are crucial for normal tissue development and organ physiology. Loss or alteration of ECM components turns towards a disease outcome. In this review, we provide a general overview of ECM components with a special focus on collagens, the most abundant and diverse ECM molecules. We discuss the different functions of the ECM including its impact on cell proliferation, migration and differentiation by highlighting the relevance of the bidirectional cross-talk between the matrix and surrounding cells. By systematically reviewing all the hereditary disorders associated to altered collagen structure or resulting in excessive collagen degradation, we point to the functional relevance of the collagen and therefore of the ECM elements for human health. Moreover, the large overlapping spectrum of clinical features of the collagen-related disorders makes in some cases the patient clinical diagnosis very difficult. A better understanding of ECM complexity and molecular mechanisms regulating the expression and functions of the various ECM elements will be fundamental to fully recognize the different clinical entities.
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Affiliation(s)
- Lavinia Arseni
- Department of Molecular Genetics, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany.
| | - Anita Lombardi
- Istituto di Genetica Molecolare, Consiglio Nazionale delle Ricerche, 27100 Pavia, Italy.
| | - Donata Orioli
- Istituto di Genetica Molecolare, Consiglio Nazionale delle Ricerche, 27100 Pavia, Italy.
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14
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Chaudhuri A, Biswas S, Chakraborty S. Exploring protein–protein intermolecular recognition between meprin-α and endogenous protease regulator cystatinC coupled with pharmacophore elucidation. J Biomol Struct Dyn 2018; 37:440-453. [PMID: 29343185 DOI: 10.1080/07391102.2018.1429311] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Ankur Chaudhuri
- Department of Microbiology, West Bengal State University, Barasat, Berunanpukuria, P.O. Malikapur, North 24 Parganas, Kolkata 700126, West Bengal, India
| | - Sampa Biswas
- Crystallography and Molecular Biology Division, Saha Institute of Nuclear Physics, Block – AF, Sector – 1, Bidhannagar, Kolkata 700064, West Bengal, India
| | - Sibani Chakraborty
- Department of Microbiology, West Bengal State University, Barasat, Berunanpukuria, P.O. Malikapur, North 24 Parganas, Kolkata 700126, West Bengal, India
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15
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Meprin metalloproteases: Molecular regulation and function in inflammation and fibrosis. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:2096-2104. [PMID: 28502593 DOI: 10.1016/j.bbamcr.2017.05.011] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 05/05/2017] [Accepted: 05/09/2017] [Indexed: 01/03/2023]
Abstract
The zinc-endopeptidases meprin α and meprin β are extracellular proteases involved in connective tissue homeostasis, intestinal barrier function and immunological processes. Meprins are unique among other extracellular proteases with regard to cleavage specificity and structure. Meprin α and meprin β have a strong preference for negatively charged amino acids around the scissile bond, reflected by cleavage sites identified in procollagen I, the amyloid precursor protein (APP) and the interleukin-6 receptor (IL-6R). In this review we report on recent findings that summarize the complex molecular regulation of meprins, particular folding, activation and shedding. Dysregulation of meprin α and meprin β is often associated with pathological conditions such as neurodegeneration, inflammatory bowel disease and fibrosis. Based on mouse models and patient data we suggest meprins as possible key regulators in the onset and progression of fibrotic disorders, leading to severe diseases such as pulmonary hypertension. This article is part of a Special Issue entitled: Proteolysis as a Regulatory Event in Pathophysiology edited by Stefan Rose-John.
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16
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Herr UM, Strecker P, Storck SE, Thomas C, Rabiej V, Junker A, Schilling S, Schmidt N, Dowds CM, Eggert S, Pietrzik CU, Kins S. LRP1 Modulates APP Intraneuronal Transport and Processing in Its Monomeric and Dimeric State. Front Mol Neurosci 2017; 10:118. [PMID: 28496400 PMCID: PMC5406469 DOI: 10.3389/fnmol.2017.00118] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Accepted: 04/10/2017] [Indexed: 12/31/2022] Open
Abstract
The low-density lipoprotein receptor-related protein 1, LRP1, interacts with APP and affects its processing. This is assumed to be mostly caused by the impact of LRP1 on APP endocytosis. More recently, also an interaction of APP and LRP1 early in the secretory pathway was reported whereat retention of LRP1 in the ER leads to decreased APP cell surface levels and in turn, to reduced Aβ secretion. Here, we extended the biochemical and immunocytochemical analyses by showing via live cell imaging analyses in primary neurons that LRP1 and APP are transported only partly in common (one third) but to a higher degree in distinct fast axonal transport vesicles. Interestingly, co-expression of LRP1 and APP caused a change of APP transport velocities, indicating that LRP1 recruits APP to a specific type of fast axonal transport vesicles. In contrast lowered levels of LRP1 facilitated APP transport. We further show that monomeric and dimeric APP exhibit similar transport characteristics and that both are affected by LRP1 in a similar way, by slowing down APP anterograde transport and increasing its endocytosis rate. In line with this, a knockout of LRP1 in CHO cells and in primary neurons caused an increase of monomeric and dimeric APP surface localization and in turn accelerated shedding by meprin β and ADAM10. Notably, a choroid plexus specific LRP1 knockout caused a much higher secretion of sAPP dimers into the cerebrospinal fluid compared to sAPP monomers. Together, our data show that LRP1 functions as a sorting receptor for APP, regulating its cell surface localization and thereby its processing by ADAM10 and meprin β, with the latter exhibiting a preference for APP in its dimeric state.
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Affiliation(s)
- Uta-Mareike Herr
- Institute of Pathobiochemistry, Molecular Neurodegeneration, University Medical Center of the Johannes Gutenberg-University MainzMainz, Germany
| | - Paul Strecker
- Division of Human Biology and Human Genetics, Technical University of KaiserslauternKaiserslautern, Germany
| | - Steffen E Storck
- Institute of Pathobiochemistry, Molecular Neurodegeneration, University Medical Center of the Johannes Gutenberg-University MainzMainz, Germany
| | - Carolin Thomas
- Division of Human Biology and Human Genetics, Technical University of KaiserslauternKaiserslautern, Germany
| | - Verena Rabiej
- Institute of Pathobiochemistry, Molecular Neurodegeneration, University Medical Center of the Johannes Gutenberg-University MainzMainz, Germany
| | - Anne Junker
- Institute of Pathobiochemistry, Molecular Neurodegeneration, University Medical Center of the Johannes Gutenberg-University MainzMainz, Germany
| | - Sandra Schilling
- Division of Human Biology and Human Genetics, Technical University of KaiserslauternKaiserslautern, Germany
| | - Nadine Schmidt
- Division of Human Biology and Human Genetics, Technical University of KaiserslauternKaiserslautern, Germany
| | - C Marie Dowds
- Division of Human Biology and Human Genetics, Technical University of KaiserslauternKaiserslautern, Germany
| | - Simone Eggert
- Division of Human Biology and Human Genetics, Technical University of KaiserslauternKaiserslautern, Germany
| | - Claus U Pietrzik
- Institute of Pathobiochemistry, Molecular Neurodegeneration, University Medical Center of the Johannes Gutenberg-University MainzMainz, Germany
| | - Stefan Kins
- Division of Human Biology and Human Genetics, Technical University of KaiserslauternKaiserslautern, Germany
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17
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Arnold P, Boll I, Rothaug M, Schumacher N, Schmidt F, Wichert R, Schneppenheim J, Lokau J, Pickhinke U, Koudelka T, Tholey A, Rabe B, Scheller J, Lucius R, Garbers C, Rose-John S, Becker-Pauly C. Meprin Metalloproteases Generate Biologically Active Soluble Interleukin-6 Receptor to Induce Trans-Signaling. Sci Rep 2017; 7:44053. [PMID: 28276471 PMCID: PMC5343444 DOI: 10.1038/srep44053] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 02/03/2017] [Indexed: 12/27/2022] Open
Abstract
Soluble Interleukin-6 receptor (sIL-6R) mediated trans-signaling is an important pro-inflammatory stimulus associated with pathological conditions, such as arthritis, neurodegeneration and inflammatory bowel disease. The sIL-6R is generated proteolytically from its membrane bound form and A Disintegrin And Metalloprotease (ADAM) 10 and 17 were shown to perform ectodomain shedding of the receptor in vitro and in vivo. However, under certain conditions not all sIL-6R could be assigned to ADAM10/17 activity. Here, we demonstrate that the IL-6R is a shedding substrate of soluble meprin α and membrane bound meprin β, resulting in bioactive sIL-6R that is capable of inducing IL-6 trans-signaling. We determined cleavage within the N-terminal part of the IL-6R stalk region, distinct from the cleavage site reported for ADAM10/17. Interestingly, meprin β can be shed from the cell surface by ADAM10/17 and the observation that soluble meprin β is not capable of shedding the IL-6R suggests a regulatory mechanism towards trans-signaling. Additionally, we observed a significant negative correlation of meprin β expression and IL-6R levels on human granulocytes, providing evidence for in vivo function of this proteolytic interaction.
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Affiliation(s)
- Philipp Arnold
- Institute of Anatomy, University of Kiel, 24118 Kiel, Germany
| | - Inga Boll
- Institute of Biochemistry, University of Kiel, 24118 Kiel, Germany
| | - Michelle Rothaug
- Institute of Biochemistry, University of Kiel, 24118 Kiel, Germany
| | - Neele Schumacher
- Institute of Biochemistry, University of Kiel, 24118 Kiel, Germany
| | | | - Rielana Wichert
- Institute of Biochemistry, University of Kiel, 24118 Kiel, Germany
| | | | - Juliane Lokau
- Institute of Biochemistry, University of Kiel, 24118 Kiel, Germany
| | - Ute Pickhinke
- Institute of Biochemistry, University of Kiel, 24118 Kiel, Germany
| | - Tomas Koudelka
- Systematic Proteomics &Bioanalytics; Institute of Experimental Medicine; University of Kiel, 24105 Kiel, Germany
| | - Andreas Tholey
- Systematic Proteomics &Bioanalytics; Institute of Experimental Medicine; University of Kiel, 24105 Kiel, Germany
| | - Björn Rabe
- Institute of Biochemistry, University of Kiel, 24118 Kiel, Germany
| | - Jürgen Scheller
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University, 40225 Düsseldorf, Germany
| | - Ralph Lucius
- Institute of Anatomy, University of Kiel, 24118 Kiel, Germany
| | | | - Stefan Rose-John
- Institute of Biochemistry, University of Kiel, 24118 Kiel, Germany
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18
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Effects of Glycosylation on the Enzymatic Activity and Mechanisms of Proteases. Int J Mol Sci 2016; 17:ijms17121969. [PMID: 27898009 PMCID: PMC5187769 DOI: 10.3390/ijms17121969] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2016] [Revised: 11/07/2016] [Accepted: 11/10/2016] [Indexed: 02/06/2023] Open
Abstract
Posttranslational modifications are an important feature of most proteases in higher organisms, such as the conversion of inactive zymogens into active proteases. To date, little information is available on the role of glycosylation and functional implications for secreted proteases. Besides a stabilizing effect and protection against proteolysis, several proteases show a significant influence of glycosylation on the catalytic activity. Glycans can alter the substrate recognition, the specificity and binding affinity, as well as the turnover rates. However, there is currently no known general pattern, since glycosylation can have both stimulating and inhibiting effects on activity. Thus, a comparative analysis of individual cases with sufficient enzyme kinetic and structural data is a first approach to describe mechanistic principles that govern the effects of glycosylation on the function of proteases. The understanding of glycan functions becomes highly significant in proteomic and glycomic studies, which demonstrated that cancer-associated proteases, such as kallikrein-related peptidase 3, exhibit strongly altered glycosylation patterns in pathological cases. Such findings can contribute to a variety of future biomedical applications.
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19
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Herzog C, Haun RS, Shah SV, Kaushal GP. Proteolytic processing and inactivation of CCL2/MCP-1 by meprins. Biochem Biophys Rep 2016; 8:146-150. [PMID: 28955950 PMCID: PMC5613766 DOI: 10.1016/j.bbrep.2016.08.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 08/13/2016] [Accepted: 08/18/2016] [Indexed: 11/16/2022] Open
Abstract
Monocyte chemotactic protein 1 (CCL2/MCP-1) is a small chemokine involved in the recruitment and trafficking of mononuclear immune cells to inflammation sites. Our studies demonstrate that the metalloendopeptidases meprin A (purified from kidney cortex), recombinant meprin α, and recombinant meprin β can all process CCL2/MCP-1. The cleavage sites were determined by amino acid sequencing and mass spectrometry analysis of the generated products, and the biological activity of the products was evaluated by chemotactic migration assay using THP-1 cells. The cleavage sites generated by the meprin isoforms revealed that meprin A and meprin α cleaved the N-terminal domain of mouse CCL2/MCP-1 at the Asn6 and Ala7 bond, resulting in significant reduction in the chemotactic activity of the cleaved CCL2/MCP-1. Meprin β was unable to cleave the N-terminus of mouse CCL2/MCP-1 but cleaved the C-terminal region between Ser74 and Glu75. Human CCL2/MCP-1 that lacks the murine C-terminal region was also cleaved by meprin α at the N-terminus resulting in significant loss of CCL2/MCP-1 biological activity, whereas meprin β did not affect the biological activity. These studies suggest that meprin α and meprin β may play important roles in regulating the CCL2/MCP-1 chemokine activity during inflammation.
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Affiliation(s)
- Christian Herzog
- Central Arkansas Veterans Healthcare System, Little Rock, AR, USA.,University of Arkansas for Medical Sciences, Department of Internal Medicine, Little Rock, AR, USA
| | - Randy S Haun
- Central Arkansas Veterans Healthcare System, Little Rock, AR, USA.,University of Arkansas for Medical Sciences, Department of Pharmaceutical Sciences, Little Rock, AR, USA
| | - Sudhir V Shah
- Central Arkansas Veterans Healthcare System, Little Rock, AR, USA.,University of Arkansas for Medical Sciences, Department of Internal Medicine, Little Rock, AR, USA
| | - Gur P Kaushal
- Central Arkansas Veterans Healthcare System, Little Rock, AR, USA.,University of Arkansas for Medical Sciences, Department of Internal Medicine, Little Rock, AR, USA.,University of Arkansas for Medical Sciences, Department of Biochemistry, Little Rock, AR, USA
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20
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Madoux F, Tredup C, Spicer TP, Scampavia L, Chase PS, Hodder PS, Fields GB, Becker-Pauly C, Minond D. Development of high throughput screening assays and pilot screen for inhibitors of metalloproteases meprin α and β. Biopolymers 2016; 102:396-406. [PMID: 25048711 DOI: 10.1002/bip.22527] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Revised: 06/24/2014] [Accepted: 07/15/2014] [Indexed: 12/18/2022]
Abstract
Zinc metalloproteinases meprin α and meprin β are implicated in a variety of diseases, such as fibrosis, inflammation and neurodegeneration, however, there are no selective small molecule inhibitors that would allow to study their role in these processes. To address this lack of molecular tools, we have developed high throughput screening assays to enable discovery of inhibitors of both meprin α and meprin β and screened a collection of well characterized pharmaceutical agents (library of pharmaceutically active compounds, n = 1,280 compounds). Two compounds (PPNDS, NF449) confirmed their activity and selectivity for meprin β. Kinetic studies revealed competitive (PPNDS) and mixed competitive/noncompetitive (NF449) inhibition mechanisms suggesting that binding occurs in meprin β active site. Both PPNDS and NF449 exhibited low nanomolar IC50 and Ki values making them the most potent and selective inhibitors of meprin β reported to the date. These results demonstrate the ability of meprin α and β assays to identify selective compounds and discard artifacts of primary screening.
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Affiliation(s)
- Franck Madoux
- Lead Identification Division, Translational Research Institute, The Scripps Research Institute, 130 Scripps Way, Jupiter, Fl, 34987
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21
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Herzog C, Marisiddaiah R, Haun RS, Kaushal GP. Basement membrane protein nidogen-1 is a target of meprin β in cisplatin nephrotoxicity. Toxicol Lett 2015; 236:110-6. [PMID: 25957482 DOI: 10.1016/j.toxlet.2015.05.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 04/18/2015] [Accepted: 05/05/2015] [Indexed: 01/08/2023]
Abstract
Meprins are oligomeric metalloproteinases that are abundantly expressed in the brush-border membranes of renal proximal tubules. During acute kidney injury (AKI) induced by cisplatin or ischemia-reperfusion, membrane-bound meprins are shed and their localization is altered from the apical membranes toward the basolateral surface of the proximal tubules. Meprins are capable of cleaving basement membrane proteins in vitro, however, it is not known whether meprins are able to degrade extracellular matrix proteins under pathophysiological conditions in vivo. The present study demonstrates that a basement membrane protein, nidogen-1, is cleaved and excreted in the urine of mice subjected to cisplatin-induced nephrotoxicity, a model of AKI. Cleaved nidogen-1 was not detected in the urine of untreated mice, but during the progression of cisplatin nephrotoxicity, the excretion of cleaved nidogen-1 increased in a time-dependent manner. The meprin inhibitor actinonin markedly prevented urinary excretion of the cleaved nidogen-1. In addition, meprin β-deficient mice, but not meprin α-deficient mice, subjected to cisplatin nephrotoxicity significantly suppressed excretion of cleaved nidogen-1, further suggesting that meprin β is involved in the cleavage of nidogen-1. These studies provide strong evidence for a pathophysiological link between meprin β and urinary excretion of cleaved nidogen-1 during cisplatin-induced AKI.
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Affiliation(s)
- Christian Herzog
- Central Arkansas Veterans Healthcare System, Little Rock, AR 72205, USA; University of Arkansas for Medical Sciences, Department of Internal Medicine, Little Rock, AR 72205, USA
| | - Raju Marisiddaiah
- Central Arkansas Veterans Healthcare System, Little Rock, AR 72205, USA; University of Arkansas for Medical Sciences, Department of Internal Medicine, Little Rock, AR 72205, USA
| | - Randy S Haun
- Central Arkansas Veterans Healthcare System, Little Rock, AR 72205, USA; University of Arkansas for Medical Sciences, Department of Pharmaceutical Sciences, Little Rock, AR 72205, USA
| | - Gur P Kaushal
- Central Arkansas Veterans Healthcare System, Little Rock, AR 72205, USA; University of Arkansas for Medical Sciences, Department of Internal Medicine, Little Rock, AR 72205, USA; University of Arkansas for Medical Sciences, Department of Biochemistry, Little Rock, AR 72205, USA.
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22
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Prox J, Arnold P, Becker-Pauly C. Meprin α and meprin β: Procollagen proteinases in health and disease. Matrix Biol 2015; 44-46:7-13. [DOI: 10.1016/j.matbio.2015.01.010] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 01/13/2015] [Accepted: 01/13/2015] [Indexed: 12/21/2022]
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23
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Bonnans C, Chou J, Werb Z. Remodelling the extracellular matrix in development and disease. Nat Rev Mol Cell Biol 2015; 15:786-801. [PMID: 25415508 DOI: 10.1038/nrm3904] [Citation(s) in RCA: 2701] [Impact Index Per Article: 300.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The extracellular matrix (ECM) is a highly dynamic structure that is present in all tissues and continuously undergoes controlled remodelling. This process involves quantitative and qualitative changes in the ECM, mediated by specific enzymes that are responsible for ECM degradation, such as metalloproteinases. The ECM interacts with cells to regulate diverse functions, including proliferation, migration and differentiation. ECM remodelling is crucial for regulating the morphogenesis of the intestine and lungs, as well as of the mammary and submandibular glands. Dysregulation of ECM composition, structure, stiffness and abundance contributes to several pathological conditions, such as fibrosis and invasive cancer. A better understanding of how the ECM regulates organ structure and function and of how ECM remodelling affects disease progression will contribute to the development of new therapeutics.
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Affiliation(s)
- Caroline Bonnans
- 1] Department of Anatomy, University of California, 513 Parnassus Avenue, San Francisco, California 94143-0452, USA. [2] Oncology Department, INSERM U661, Functional Genomic Institute, 141 rue de la Cardonille, 34094 Montpellier, France
| | - Jonathan Chou
- 1] Department of Anatomy, University of California, 513 Parnassus Avenue, San Francisco, California 94143-0452, USA. [2] Department of Medicine, University of California, 513 Parnassus Avenue, San Francisco, California 94143-0452, USA
| | - Zena Werb
- Department of Anatomy, University of California, 513 Parnassus Avenue, San Francisco, California 94143-0452, USA
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24
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Appolaire A, Durá MA, Ferruit M, Andrieu JP, Godfroy A, Gribaldo S, Franzetti B. The TET2 and TET3 aminopeptidases fromPyrococcus horikoshiiform a hetero-subunit peptidasome with enhanced peptide destruction properties. Mol Microbiol 2014; 94:803-14. [DOI: 10.1111/mmi.12775] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/25/2014] [Indexed: 11/28/2022]
Affiliation(s)
- Alexandre Appolaire
- Univ. Grenoble Alpes; Institut de Biologie Structurale (IBS); F-38027 Grenoble France
- CNRS, IBS; F-38027 Grenoble France
- CEA, DSV, IBS; F-38027 Grenoble France
| | - M. Asunción Durá
- Univ. Grenoble Alpes; Institut de Biologie Structurale (IBS); F-38027 Grenoble France
- CNRS, IBS; F-38027 Grenoble France
- CEA, DSV, IBS; F-38027 Grenoble France
| | - Mylène Ferruit
- Univ. Grenoble Alpes; Institut de Biologie Structurale (IBS); F-38027 Grenoble France
- CNRS, IBS; F-38027 Grenoble France
- CEA, DSV, IBS; F-38027 Grenoble France
| | - Jean-Pierre Andrieu
- Univ. Grenoble Alpes; Institut de Biologie Structurale (IBS); F-38027 Grenoble France
- CNRS, IBS; F-38027 Grenoble France
- CEA, DSV, IBS; F-38027 Grenoble France
| | - Anne Godfroy
- Ifremer, UMR6197; Laboratoire de Microbiologie des Environnements Extrêmes; 29280 Plouzané France
| | - Simonetta Gribaldo
- Institut Pasteur; Unité Biologie Moléculaire du Gène chez les Extremophiles; Département de Microbiologie; 75724 Paris Cedex 15 France
| | - Bruno Franzetti
- Univ. Grenoble Alpes; Institut de Biologie Structurale (IBS); F-38027 Grenoble France
- CNRS, IBS; F-38027 Grenoble France
- CEA, DSV, IBS; F-38027 Grenoble France
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25
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Herzog C, Haun RS, Ludwig A, Shah SV, Kaushal GP. ADAM10 is the major sheddase responsible for the release of membrane-associated meprin A. J Biol Chem 2014; 289:13308-22. [PMID: 24662289 DOI: 10.1074/jbc.m114.559088] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Meprin A, composed of α and β subunits, is a membrane-bound metalloproteinase in renal proximal tubules. Meprin A plays an important role in tubular epithelial cell injury during acute kidney injury (AKI). The present study demonstrated that during ischemia-reperfusion-induced AKI, meprin A was shed from proximal tubule membranes, as evident from its redistribution toward the basolateral side, proteolytic processing in the membranes, and excretion in the urine. To identify the proteolytic enzyme responsible for shedding of meprin A, we generated stable HEK cell lines expressing meprin β alone and both meprin α and meprin β for the expression of meprin A. Phorbol 12-myristate 13-acetate and ionomycin stimulated ectodomain shedding of meprin β and meprin A. Among the inhibitors of various proteases, the broad spectrum inhibitor of the ADAM family of proteases, tumor necrosis factor-α protease inhibitor (TAPI-1), was most effective in preventing constitutive, phorbol 12-myristate 13-acetate-, and ionomycin-stimulated shedding of meprin β and meprin A in the medium of both transfectants. The use of differential inhibitors for ADAM10 and ADAM17 indicated that ADAM10 inhibition is sufficient to block shedding. In agreement with these results, small interfering RNA to ADAM10 but not to ADAM9 or ADAM17 inhibited meprin β and meprin A shedding. Furthermore, overexpression of ADAM10 resulted in enhanced shedding of meprin β from both transfectants. Our studies demonstrate that ADAM10 is the major ADAM metalloproteinase responsible for the constitutive and stimulated shedding of meprin β and meprin A. These studies further suggest that inhibiting ADAM 10 activity could be of therapeutic benefit in AKI.
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26
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Abstract
Meprins have been implicated in the pathogenesis of several inflammatory diseases, including inflammatory bowel disease, in which the cytokine IL-6 is a prominent effector molecule. Because IL-6 levels are elevated markedly in meprin α and α/β knockout mice in an experimental model of inflammatory bowel disease, the interaction between meprins and IL-6 was studied. The results demonstrate that rodent and human meprin A and B cleave IL-6 to a smaller product and, subsequently, are capable of extensive degradation of the cytokine. Analysis of the limited degradation product formed by meprin A indicated that three to five amino acids are removed from the C terminus of the cytokine. Meprin A and meprin B cleaved IL-6 with micromolar affinities (Km of 4.7 and 12.0 μM, respectively) and with high efficiencies (kcat/Km of 0.2 and 2.5 (M(-1)/s(-1)) × 10(6), respectively). These efficiency constants are among the highest for known meprin substrates. Madin-Darby canine kidney cells transiently transfected with meprin α or meprin β constructs also cleave exogenous IL-6. Both human and murine IL-6 cleaved by meprin A or B are inactivated, as demonstrated by their decreased capability to stimulate proliferation of B9 cells. These results are consistent with the proposition that one function of meprin metalloproteases is to modulate inflammation by inactivating IL-6.
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Affiliation(s)
- Timothy R Keiffer
- From the Department of Biochemistry and Molecular Biology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033
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27
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Bao J, Yura RE, Matters GL, Bradley SG, Shi P, Tian F, Bond JS. Meprin A impairs epithelial barrier function, enhances monocyte migration, and cleaves the tight junction protein occludin. Am J Physiol Renal Physiol 2013; 305:F714-26. [PMID: 23804454 DOI: 10.1152/ajprenal.00179.2012] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Meprin metalloproteases are highly expressed at the luminal interface of the intestine and kidney and in certain leukocytes. Meprins cleave a variety of substrates in vitro, including extracellular matrix proteins, adherens junction proteins, and cytokines, and have been implicated in a number of inflammatory diseases. The linkage between results in vitro and pathogenesis, however, has not been elucidated. The present study aimed to determine whether meprins are determinative factors in disrupting the barrier function of the epithelium. Active meprin A or meprin B applied to Madin-Darby canine kidney (MDCK) cell monolayers increased permeability to fluorescein isothiocyanate-dextran and disrupted immunostaining of the tight junction protein occludin but not claudin-4. Meprin A, but not meprin B, cleaved occludin in MDCK monolayers. Experiments with recombinant occludin demonstrated that meprin A cleaves the protein between Gly(100) and Ser(101) on the first extracellular loop. In vivo experiments demonstrated that meprin A infused into the mouse bladder increased the epithelium permeability to sodium fluorescein. Furthermore, monocytes from meprin knockout mice on a C57BL/6 background were less able to migrate through an MDCK monolayer than monocytes from their wild-type counterparts. These results demonstrate the capability of meprin A to disrupt epithelial barriers and implicate occludin as one of the important targets of meprin A that may modulate inflammation.
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Affiliation(s)
- Jialing Bao
- Dept. of Biochemistry and Molecular Biology, The Pennsylvania State Univ. College of Medicine, 500 University Dr., H171, Hershey, PA 17033, USA
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The metalloproteases meprin α and meprin β: unique enzymes in inflammation, neurodegeneration, cancer and fibrosis. Biochem J 2013; 450:253-64. [PMID: 23410038 PMCID: PMC3573791 DOI: 10.1042/bj20121751] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The metalloproteases meprin α and meprin β exhibit structural and functional features that are unique among all extracellular proteases. Although meprins were discovered more than 30 years ago, their precise substrates and physiological roles have been elusive. Both enzymes were originally found to be highly expressed in kidney and intestine, which focused research on these particular tissues and associated pathologies. Only recently it has become evident that meprins exhibit a much broader expression pattern, implicating functions in angiogenesis, cancer, inflammation, fibrosis and neurodegenerative diseases. Different animal models, as well as proteomics approaches for the identification of protease substrates, have helped to reveal more precise molecular signalling events mediated by meprin activity, such as activation and release of pro-inflammatory cytokines. APP (amyloid precursor protein) is cleaved by meprin β in vivo, reminiscent of the β-secretase BACE1 (β-site APP-cleaving enzyme 1). The subsequent release of Aβ (amyloid β) peptides is thought to be the major cause of the neurodegenerative Alzheimer's disease. On the other hand, ADAM10 (a disintegrin and metalloprotease domain 10), which is the constitutive α-secretase, was shown to be activated by meprin β, which is itself shed from the cell surface by ADAM10. In skin, both meprins are overexpressed in fibrotic tumours, characterized by massive accumulation of fibrillar collagens. Indeed, procollagen III is processed to its mature form by meprin α and meprin β, an essential step in collagen fibril assembly. The recently solved crystal structure of meprin β and the unique cleavage specificity of these proteases identified by proteomics will help to generate specific inhibitors that could be used as therapeutics to target meprins under certain pathological conditions.
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29
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Kaushal GP, Haun RS, Herzog C, Shah SV. Meprin A metalloproteinase and its role in acute kidney injury. Am J Physiol Renal Physiol 2013; 304:F1150-8. [PMID: 23427141 DOI: 10.1152/ajprenal.00014.2013] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Meprin A, composed of α- and β-subunits, is a membrane-associated neutral metalloendoprotease that belongs to the astacin family of zinc endopeptidases. It was first discovered as an azocasein and benzoyl-l-tyrosyl-p-aminobenzoic acid hydrolase in the brush-border membranes of proximal tubules and intestines. Meprin isoforms are now found to be widely distributed in various organs (kidney, intestines, leukocytes, skin, bladder, and a variety of cancer cells) and are capable of hydrolyzing and processing a large number of substrates, including extracellular matrix proteins, cytokines, adherens junction proteins, hormones, bioactive peptides, and cell surface proteins. The ability of meprin A to cleave various substrates sheds new light on the functional properties of this enzyme, including matrix remodeling, inflammation, and cell-cell and cell-matrix processes. Following ischemia-reperfusion (IR)- and cisplatin-induced acute kidney injury (AKI), meprin A is redistributed toward the basolateral plasma membrane, and the cleaved form of meprin A is excreted in the urine. These studies suggest that altered localization and shedding of meprin A in places other than the apical membranes may be deleterious in vivo in acute tubular injury. These studies also provide new insight into the importance of a sheddase involved in the release of membrane-associated meprin A under pathological conditions. Meprin A is injurious to the kidney during AKI, as meprin A-knockout mice and meprin inhibition provide protective roles and improve renal function. Meprin A, therefore, plays an important role in AKI and potentially is a unique target for therapeutic intervention during AKI.
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Affiliation(s)
- Gur P Kaushal
- Central Arkansas Veterans Healthcare System, 4300 West 7th St., 111D/LR, Little Rock, AR 72205, USA.
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30
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Murakami Y, Adachi H, Sakaida T, Tanaka H, Yashiro Y, Nakata S. The Reduction Mechanism of the Type III/I Collagen Ratio with Aging: Age-related Change in Meprin, a Type III Collagen Propeptide Cleavage Enzyme. ACTA ACUST UNITED AC 2013. [DOI: 10.5107/sccj.47.278] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
| | | | | | | | | | - Satoru Nakata
- Research Laboratories, Nippon Menard Cosmetic Co., Ltd
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31
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Roff AN, Panganiban RP, Bond JS, Ishmael FT. Post-transcriptional regulation of meprin α by the RNA-binding proteins Hu antigen R (HuR) and tristetraprolin (TTP). J Biol Chem 2012; 288:4733-43. [PMID: 23269677 DOI: 10.1074/jbc.m112.444208] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Meprins are multimeric proteases that are implicated in inflammatory bowel disease by both genetic association studies and functional studies in knock-out mice. Patients with inflammatory bowel disease show decreased colonic expression of meprin α, although regulation of expression, particularly under inflammatory stimuli, has not been studied. The studies herein demonstrate that the human meprin α transcript is bound and stabilized by Hu antigen R at baseline, and that treatment with the inflammatory stimulus phorbol 12-myristate 13-acetate downregulates meprin α expression by inducing tristetraprolin. The enhanced binding of tristetraprolin to the MEP1A 3'-UTR results in destabilization of the transcript and occurs at a discrete site from Hu antigen R. This is the first report to describe a mechanism for post-transcriptional regulation of meprin α and will help clarify the role of meprins in the inflammatory response and disease.
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Affiliation(s)
- Alanna N Roff
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033, USA
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32
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Geurts N, Becker-Pauly C, Martens E, Proost P, Van den Steen PE, Stöcker W, Opdenakker G. Meprins process matrix metalloproteinase-9 (MMP-9)/gelatinase B and enhance the activation kinetics by MMP-3. FEBS Lett 2012; 586:4264-9. [PMID: 23123160 DOI: 10.1016/j.febslet.2012.10.033] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Accepted: 10/18/2012] [Indexed: 01/22/2023]
Abstract
Meprin α and β, members of the astacin family of zinc metalloproteinases, are unique plasma membrane and secreted proteases known to cleave a wide range of biological substrates involved in inflammation, cancer and fibrosis. In this study, we identified proMMP-9 as a novel substrate and show that aminoterminal meprin-mediated clipping improves the activation kinetics of proMMP-9 by MMP-3, an efficient activator of proMMP-9. Interestingly, the NH(2)-terminus LVLFPGDL, generated by incubation with meprin α, is identical to the form produced in conditioned media from human neutrophils and monocytes. Hence, this meprin-mediated processing and enhancement of MMP-9 activation kinetics may have biological relevance in the context of in vivo inflammatory processes.
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Affiliation(s)
- Nathalie Geurts
- Laboratory of Immunobiology, Rega Institute for Medical Research, University of Leuven, Minderbroedersstraat 10, 3000 Leuven, Belgium
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33
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Structural basis for the sheddase function of human meprin β metalloproteinase at the plasma membrane. Proc Natl Acad Sci U S A 2012; 109:16131-6. [PMID: 22988105 DOI: 10.1073/pnas.1211076109] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Ectodomain shedding at the cell surface is a major mechanism to regulate the extracellular and circulatory concentration or the activities of signaling proteins at the plasma membrane. Human meprin β is a 145-kDa disulfide-linked homodimeric multidomain type-I membrane metallopeptidase that sheds membrane-bound cytokines and growth factors, thereby contributing to inflammatory diseases, angiogenesis, and tumor progression. In addition, it cleaves amyloid precursor protein (APP) at the β-secretase site, giving rise to amyloidogenic peptides. We have solved the X-ray crystal structure of a major fragment of the meprin β ectoprotein, the first of a multidomain oligomeric transmembrane sheddase, and of its zymogen. The meprin β dimer displays a compact shape, whose catalytic domain undergoes major rearrangement upon activation, and reveals an exosite and a sugar-rich channel, both of which possibly engage in substrate binding. A plausible structure-derived working mechanism suggests that substrates such as APP are shed close to the plasma membrane surface following an "N-like" chain trace.
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34
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Jefferson T, Auf dem Keller U, Bellac C, Metz VV, Broder C, Hedrich J, Ohler A, Maier W, Magdolen V, Sterchi E, Bond JS, Jayakumar A, Traupe H, Chalaris A, Rose-John S, Pietrzik CU, Postina R, Overall CM, Becker-Pauly C. The substrate degradome of meprin metalloproteases reveals an unexpected proteolytic link between meprin β and ADAM10. Cell Mol Life Sci 2012; 70:309-33. [PMID: 22940918 PMCID: PMC3535375 DOI: 10.1007/s00018-012-1106-2] [Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Revised: 07/19/2012] [Accepted: 07/23/2012] [Indexed: 01/10/2023]
Abstract
The in vivo roles of meprin metalloproteases in pathophysiological conditions remain elusive. Substrates define protease roles. Therefore, to identify natural substrates for human meprin α and β we employed TAILS (terminal amine isotopic labeling of substrates), a proteomics approach that enriches for N-terminal peptides of proteins and cleavage fragments. Of the 151 new extracellular substrates we identified, it was notable that ADAM10 (a disintegrin and metalloprotease domain-containing protein 10)-the constitutive α-secretase-is activated by meprin β through cleavage of the propeptide. To validate this cleavage event, we expressed recombinant proADAM10 and after preincubation with meprin β, this resulted in significantly elevated ADAM10 activity. Cellular expression in murine primary fibroblasts confirmed activation. Other novel substrates including extracellular matrix proteins, growth factors and inhibitors were validated by western analyses and enzyme activity assays with Edman sequencing confirming the exact cleavage sites identified by TAILS. Cleavages in vivo were confirmed by comparing wild-type and meprin(-/-) mice. Our finding of cystatin C, elafin and fetuin-A as substrates and natural inhibitors for meprins reveal new mechanisms in the regulation of protease activity important for understanding pathophysiological processes.
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Affiliation(s)
- Tamara Jefferson
- Institute of Biochemistry, Christian-Albrechts-University, 24118, Kiel, Germany
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35
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Lottaz D, Maurer CA, Noël A, Blacher S, Huguenin M, Nievergelt A, Niggli V, Kern A, Müller S, Seibold F, Friess H, Becker-Pauly C, Stöcker W, Sterchi EE. Enhanced activity of meprin-α, a pro-migratory and pro-angiogenic protease, in colorectal cancer. PLoS One 2011; 6:e26450. [PMID: 22096485 PMCID: PMC3214016 DOI: 10.1371/journal.pone.0026450] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Accepted: 09/27/2011] [Indexed: 11/22/2022] Open
Abstract
Meprin-α is a metalloprotease overexpressed in cancer cells, leading to the accumulation of this protease in a subset of colorectal tumors. The impact of increased meprin-α levels on tumor progression is not known. We investigated the effect of this protease on cell migration and angiogenesis in vitro and studied the expression of meprin-α mRNA, protein and proteolytic activity in primary tumors at progressive stages and in liver metastases of patients with colorectal cancer, as well as inhibitory activity towards meprin-α in sera of cancer patient as compared to healthy controls. We found that the hepatocyte growth factor (HGF)- induced migratory response of meprin-transfected epithelial cells was increased compared to wild-type cells in the presence of plasminogen, and that the angiogenic response in organ-cultured rat aortic explants was enhanced in the presence of exogenous human meprin-α. In patients, meprin-α mRNA was expressed in colonic adenomas, primary tumors UICC (International Union Against Cancer) stage I, II, III and IV, as well as in liver metastases. In contrast, the corresponding protein accumulated only in primary tumors and liver metastases, but not in adenomas. However, liver metastases lacked meprin-α activity despite increased expression of the corresponding protein, which correlated with inefficient zymogen activation. Sera from cancer patients exhibited reduced meprin-α inhibition compared to healthy controls. In conclusion, meprin-α activity is regulated differently in primary tumors and metastases, leading to high proteolytic activity in primary tumors and low activity in liver metastases. By virtue of its pro-migratory and pro-angiogenic activity, meprin-α may promote tumor progression in colorectal cancer.
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Affiliation(s)
- Daniel Lottaz
- Department of Rheumatology, Clinical Immunology and Allergology, Inselspital, University Hospital of Bern, Bern, Switzerland
- * E-mail: (DL); (EES)
| | | | - Agnès Noël
- Laboratory of Biology of Tumor and Development, Groupe Interdisciplinaire de Génoprotéomique Appliqué-Recherche (GIGA-Cancer), University of Liège, Liège, Belgium
| | - Silvia Blacher
- Laboratory of Biology of Tumor and Development, Groupe Interdisciplinaire de Génoprotéomique Appliqué-Recherche (GIGA-Cancer), University of Liège, Liège, Belgium
| | - Maya Huguenin
- Institute of Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland
| | | | - Verena Niggli
- Institute of Pathology, University of Bern, Bern, Switzerland
| | - Alexander Kern
- Department of Visceral, Thoracic and Vascular Surgery, Technische Universität Dresden, Dresden, Germany
| | - Stefan Müller
- Department of Gastroenterology, University of Bern, Bern, Switzerland
| | - Frank Seibold
- Department of Gastroenterology, University of Bern, Bern, Switzerland
| | - Helmut Friess
- Department of Surgery, Technische Universität München, München, Germany
| | | | - Walter Stöcker
- Institute of Zoology, Johannes-Gutenberg University, Mainz, Germany
| | - Erwin E. Sterchi
- Institute of Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland
- * E-mail: (DL); (EES)
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36
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Lorenzen I, Trad A, Grötzinger J. Multimerisation of A disintegrin and metalloprotease protein-17 (ADAM17) is mediated by its EGF-like domain. Biochem Biophys Res Commun 2011; 415:330-6. [PMID: 22033402 DOI: 10.1016/j.bbrc.2011.10.056] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 10/11/2011] [Indexed: 11/19/2022]
Abstract
A disintegrin and metalloprotease protein 17 (ADAM17) is a transmembrane zinc dependent metalloprotease. The catalytic activity of the enzyme results in the shedding of a broad range of membrane proteins. The release of the corresponding ectodomains induces a switch in various physiological and pathophysiological processes. So far there is not much information about the molecular mechanism of ADAM17 activation available. As for other transmembrane proteases, multimerisation may play a critical role in the activation and function of ADAM17. The present work demonstrates that ADAM17 indeed exists as a multimer in the cell membrane and that this multimerisation is mediated by its EGF-like domain.
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Affiliation(s)
- Inken Lorenzen
- Biochemisches Institut der Christian-Albrechts-Universität Kiel, Olshausenstr. 40, 24118 Kiel, Germany.
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37
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Jefferson T, Čaušević M, auf dem Keller U, Schilling O, Isbert S, Geyer R, Maier W, Tschickardt S, Jumpertz T, Weggen S, Bond JS, Overall CM, Pietrzik CU, Becker-Pauly C. Metalloprotease meprin beta generates nontoxic N-terminal amyloid precursor protein fragments in vivo. J Biol Chem 2011; 286:27741-50. [PMID: 21646356 PMCID: PMC3149364 DOI: 10.1074/jbc.m111.252718] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2011] [Revised: 06/02/2011] [Indexed: 01/07/2023] Open
Abstract
Identification of physiologically relevant substrates is still the most challenging part in protease research for understanding the biological activity of these enzymes. The zinc-dependent metalloprotease meprin β is known to be expressed in many tissues with functions in health and disease. Here, we demonstrate unique interactions between meprin β and the amyloid precursor protein (APP). Although APP is intensively studied as a ubiquitously expressed cell surface protein, which is involved in Alzheimer disease, its precise physiological role and relevance remain elusive. Based on a novel proteomics technique termed terminal amine isotopic labeling of substrates (TAILS), APP was identified as a substrate for meprin β. Processing of APP by meprin β was subsequently validated using in vitro and in vivo approaches. N-terminal APP fragments of about 11 and 20 kDa were found in human and mouse brain lysates but not in meprin β(-/-) mouse brain lysates. Although these APP fragments were in the range of those responsible for caspase-induced neurodegeneration, we did not detect cytotoxicity to primary neurons treated by these fragments. Our data demonstrate that meprin β is a physiologically relevant enzyme in APP processing.
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Affiliation(s)
- Tamara Jefferson
- From Cell and Matrix Biology, Johannes Gutenberg-University, 55128 Mainz, Germany
| | - Mirsada Čaušević
- the Institute of Pathobiochemistry, University Medical Center of the Johannes Gutenberg-University, 55128 Mainz, Germany
| | - Ulrich auf dem Keller
- the Institute of Cell Biology, Swiss Federal Institute of Technology Zurich, ETH Hoenggerberg, HPM D24, CH-8093 Zurich, Switzerland
| | - Oliver Schilling
- the Institute of Molecular Medicine and Cell Research, University of Freiburg, Stefan-Meier-Strasse 17, D-79104 Freiburg, Germany
| | - Simone Isbert
- the Institute of Pathobiochemistry, University Medical Center of the Johannes Gutenberg-University, 55128 Mainz, Germany
| | - Rebecca Geyer
- From Cell and Matrix Biology, Johannes Gutenberg-University, 55128 Mainz, Germany
| | - Wladislaw Maier
- the Institute of Pathobiochemistry, University Medical Center of the Johannes Gutenberg-University, 55128 Mainz, Germany
| | - Sabrina Tschickardt
- the Institute of Pathobiochemistry, University Medical Center of the Johannes Gutenberg-University, 55128 Mainz, Germany
| | - Thorsten Jumpertz
- the Department of Neuropathology, Heinrich-Heine-University, 40225 Duesseldorf, Germany
| | - Sascha Weggen
- the Department of Neuropathology, Heinrich-Heine-University, 40225 Duesseldorf, Germany
| | - Judith S. Bond
- the Department of Biochemistry and Molecular Biology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033, and
| | - Christopher M. Overall
- the Department of Biochemistry and Molecular Biology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033, and
| | - Claus U. Pietrzik
- the Institute of Pathobiochemistry, University Medical Center of the Johannes Gutenberg-University, 55128 Mainz, Germany
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38
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Ongeri EM, Anyanwu O, Reeves WB, Bond JS. Villin and actin in the mouse kidney brush-border membrane bind to and are degraded by meprins, an interaction that contributes to injury in ischemia-reperfusion. Am J Physiol Renal Physiol 2011; 301:F871-82. [PMID: 21795642 DOI: 10.1152/ajprenal.00703.2010] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Meprins, metalloproteinases abundantly expressed in the brush-border membranes (BBMs) of rodent proximal kidney tubules, have been implicated in the pathology of renal injury induced by ischemia-reperfusion (IR). Disruption of the meprin β gene and actinonin, a meprin inhibitor, both decrease kidney injury resulting from IR. To date, the in vivo kidney substrates for meprins are unknown. The studies herein implicate villin and actin as meprin substrates. Villin and actin bind to the cytoplasmic tail of meprin β, and both meprin A and B are capable of degrading villin and actin present in kidney proteins as well as purified recombinant forms of these proteins. The products resulting from degradation of villin and actin were unique to each meprin isoform. The meprin B cleavage site in villin was Glu(744)-Val(745). Recombinant forms of rat meprin B and homomeric mouse meprin A had K(m) values for villin and actin of ∼1 μM (0.6-1.2 μM). The k(cat) values varied substantially (0.6-128 s(-1)), resulting in different efficiencies for cleavage, with meprin B having the highest k(cat)/K(m) values (128 M(-1)·s(-1) × 10(6)). Following IR, meprins and villin redistributed from the BBM to the cytosol. A 37-kDa actin fragment was detected in protein fractions from wild-type, but not in comparable preparations from meprin knockout mice. The levels of the 37-kDa actin fragment were significantly higher in kidneys subjected to IR. The data establish that meprins interact with and cleave villin and actin, and these cytoskeletal proteins are substrates for meprins.
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Affiliation(s)
- Elimelda Moige Ongeri
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033, USA
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Luan L, Ding T, Stinnett A, Reese J, Paria BC. Adherens junction proteins in the hamster uterus: their contributions to the success of implantation. Biol Reprod 2011; 85:996-1004. [PMID: 21753191 DOI: 10.1095/biolreprod.110.090126] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
The adherens junction (AJ) is important for maintaining uterine structural integrity, composition of the luminal environment, and initiation of implantation by virtue of its properties of cell-cell recognition, adhesion, and establishment of cell polarity and permeability barriers. In this study, we investigated the uterine changes of AJ components E-cadherin, beta-catenin, and alpha-catenin at their mRNA and protein levels, together with the cellular distribution of meprinbeta, phospho-beta-catenin, and active beta-catenin proteins, in hamsters that show only ovarian progesterone-dependent uterine receptivity and implantation. By in situ hybridization and immunofluorescence, we have demonstrated that uterine epithelial cells expressed three of these AJ proteins and their mRNAs prior to and during the initial phase of implantation. Immunofluorescence study showed no change in epithelial expression patterns of uterine AJ proteins from Days 1 to 5 of pregnancy. With advancement of the implantation process, AJ components were primarily expressed in cells of the secondary decidual zone (SDZ), but not in the primary decidual zone (PDZ). In contrast, we noted strong expression of beta-catenin and alpha-catenin proteins in the PDZ, but not in the SDZ, of mice. Taken together, these results suggest that AJ proteins contribute to uterine barrier functions by cell-cell adhesion to ensure protection of the embryo. In addition, cleavage of E-cadherin by meprinbeta might contribute to weakening uterine epithelial cell-cell contact for blastocyst implantation. We also report that the nuclear localization of active beta-catenin from Day 4 onward in hamsters implies that beta-catenin/Wnt-signal transduction is activated in the uterus during implantation and decidualization.
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Affiliation(s)
- Liming Luan
- Department of Dermatology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
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40
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Becker-Pauly C, Barré O, Schilling O, Auf dem Keller U, Ohler A, Broder C, Schütte A, Kappelhoff R, Stöcker W, Overall CM. Proteomic analyses reveal an acidic prime side specificity for the astacin metalloprotease family reflected by physiological substrates. Mol Cell Proteomics 2011; 10:M111.009233. [PMID: 21693781 PMCID: PMC3186203 DOI: 10.1074/mcp.m111.009233] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Astacins are secreted and membrane-bound metalloproteases with clear associations to many important pathological and physiological processes. Yet with only a few substrates described their biological roles are enigmatic. Moreover, the lack of knowledge of astacin cleavage site specificities hampers assay and drug development. Using PICS (proteomic identification of protease cleavage site specificity) and TAILS (terminal amine isotopic labeling of substrates) degradomics approaches >3000 cleavage sites were proteomically identified for five different astacins. Such broad coverage enables family-wide determination of specificities N- and C-terminal to the scissile peptide bond. Remarkably, meprin α, meprin β, and LAST_MAM proteases exhibit a strong preference for aspartate in the peptide (P)1′ position because of a conserved positively charged residue in the active cleft subsite (S)1′. This unparalleled specificity has not been found for other families of extracellular proteases. Interestingly, cleavage specificity is also strongly influenced by proline in P2′ or P3′ leading to a rare example of subsite cooperativity. This specificity characterizes the astacins as unique contributors to extracellular proteolysis that is corroborated by known cleavage sites in procollagen I+III, VEGF (vascular endothelial growth factor)-A, IL (interleukin)-1β, and pro-kallikrein 7. Indeed, cleavage sites in VEGF-A and pro-kallikrein 7 identified by terminal amine isotopic labeling of substrates matched those reported by Edman degradation. Moreover, the novel substrate FGF-19 was validated biochemically and shown to exhibit altered biological activity after meprin processing.
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Affiliation(s)
- Christoph Becker-Pauly
- Cell and Matrix Biology, Johannes Gutenberg-University, Johannes-von-Müller-Weg 6, D-55128 Mainz, Germany.
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41
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Garcia-Caballero A, Ishmael SS, Dang Y, Gillie D, Bond JS, Milgram SL, Stutts MJ. Activation of the epithelial sodium channel by the metalloprotease meprin β subunit. Channels (Austin) 2011; 5:14-22. [PMID: 20953144 DOI: 10.4161/chan.5.1.13759] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The Epithelial Na(+) Channel (ENaC) is an apical heteromeric channel that mediates Na(+) entry into epithelial cells from the luminal cell surface. ENaC is activated by proteases that interact with the channel during biosynthesis or at the extracellular surface. Meprins are cell surface and secreted metalloproteinases of the kidney and intestine. We discovered by affinity chromatography that meprins bind γ-ENaC, a subunit of the ENaC hetero-oligomer. The physical interaction involves NH(2)-terminal cytoplasmic residues 37-54 of γ-ENaC, containing a critical gating domain immediately before the first transmembrane domain, and the cytoplasmic COOH-terminal tail of meprin β (residues 679-704). This potential association was confirmed by co-expression and co-immunoprecipitation studies. Functional assays revealed that meprins stimulate ENaC expressed exogenously in Xenopus oocytes and endogenously in epithelial cells. Co-expression of ENaC subunits and meprin β or α/β in Xenopus oocytes increased amiloride-sensitive Na(+) currents approximately two-fold. This increase was blocked by preincubation with an inhibitor of meprin activity, actinonin. The meprin-mediated increase in ENaC currents in oocytes and epithelial cell monolayers required meprin β, but not the α subunit. Meprin β promoted cleavage of α and γ-ENaC subunits at sites close to the second transmembrane domain in the extracellular domain of each channel subunit. Thus, meprin β regulates the activity of ENaC in a metalloprotease-dependent fashion.
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Affiliation(s)
- Agustin Garcia-Caballero
- Cystic Fibrosis/Pulmonary Research and Treatment Center, Pennsylvania State University College of Medicine, Hershey, USA.
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Hedrich J, Lottaz D, Meyer K, Yiallouros I, Jahnen-Dechent W, Stöcker W, Becker-Pauly C. Fetuin-A and Cystatin C Are Endogenous Inhibitors of Human Meprin Metalloproteases. Biochemistry 2010; 49:8599-607. [DOI: 10.1021/bi1004238] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Jana Hedrich
- Institute of Zoology, Cell and Matrix Biology, Johannes Gutenberg-University, Johannes-von-Müller-Weg 6, 55128 Mainz, Germany
| | - Daniel Lottaz
- Department of Rheumatology, Clinical Immunology and Allergology Inselspital, University of Bern, 3010 Bern, Switzerland
| | - Katharina Meyer
- Institute of Zoology, Cell and Matrix Biology, Johannes Gutenberg-University, Johannes-von-Müller-Weg 6, 55128 Mainz, Germany
| | - Irene Yiallouros
- Institute of Zoology, Cell and Matrix Biology, Johannes Gutenberg-University, Johannes-von-Müller-Weg 6, 55128 Mainz, Germany
| | - Willi Jahnen-Dechent
- Department of Biomedical Engineering, Biointerface Laboratory, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany
| | - Walter Stöcker
- Institute of Zoology, Cell and Matrix Biology, Johannes Gutenberg-University, Johannes-von-Müller-Weg 6, 55128 Mainz, Germany
| | - Christoph Becker-Pauly
- Institute of Zoology, Cell and Matrix Biology, Johannes Gutenberg-University, Johannes-von-Müller-Weg 6, 55128 Mainz, Germany
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Kronenberg D, Bruns BC, Moali C, Vadon-Le Goff S, Sterchi EE, Traupe H, Böhm M, Hulmes DJS, Stöcker W, Becker-Pauly C. Processing of procollagen III by meprins: new players in extracellular matrix assembly? J Invest Dermatol 2010; 130:2727-35. [PMID: 20631730 DOI: 10.1038/jid.2010.202] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Meprins α and β, a subgroup of zinc metalloproteinases belonging to the astacin family, are known to cleave components of the extracellular matrix, either during physiological remodeling or in pathological situations. In this study we present a new role for meprins in matrix assembly, namely the proteolytic processing of procollagens. Both meprins α and β release the N- and C-propeptides from procollagen III, with such processing events being critical steps in collagen fibril formation. In addition, both meprins cleave procollagen III at exactly the same site as the procollagen C-proteinases, including bone morphogenetic protein-1 (BMP-1) and other members of the tolloid proteinase family. Indeed, cleavage of procollagen III by meprins is more efficient than by BMP-1. In addition, unlike BMP-1, whose activity is stimulated by procollagen C-proteinase enhancer proteins (PCPEs), the activity of meprins on procollagen III is diminished by PCPE-1. Finally, following our earlier observations of meprin expression by human epidermal keratinocytes, meprin α is also shown to be expressed by human dermal fibroblasts. In the dermis of fibrotic skin (keloids), expression of meprin α increases and meprin β begins to be detected. Our study suggests that meprins could be important players in several remodeling processes involving collagen fiber deposition.
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Affiliation(s)
- Daniel Kronenberg
- Institut de Biologie et Chimie des Protéines, CNRS/Université de Lyon UMR 5086, IFR 128 Biosciences Gerland-Lyon Sud, Lyon, France
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Ohler A, Debela M, Wagner S, Magdolen V, Becker-Pauly C. Analyzing the protease web in skin: meprin metalloproteases are activated specifically by KLK4, 5 and 8 vice versa leading to processing of proKLK7 thereby triggering its activation. Biol Chem 2010; 391:455-60. [PMID: 20128684 DOI: 10.1515/bc.2010.023] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The metalloproteases meprin alpha and beta are expressed in several tissues, leukocytes, and cancer cells. In skin, meprins are located in separate layers of human epidermis indicating distinct physiological functions, supported by effects on cultured keratinocytes. Meprin beta induces a dramatic change in cell morphology and a significant reduction in cell number, whereas in vitro evidence suggests a role for meprin alpha in basal keratinocyte proliferation. Meprins are secreted as zymogens that are activated by tryptic proteolytical processing. Here, we identify human kallikrein-related peptidases (KLKs) 4, 5, and 8 to be specific activators of meprins. KLK5 is capable of activating both metalloproteases. Interestingly, KLK4 and 8 cleave off the propeptide of meprin beta only, whereas in contrast plasmin exclusively transforms meprin alpha to its mature form. Moreover, we show that proKLK7 is processed by meprins. N-terminal sequencing revealed cleavage by meprin beta two amino acids N-terminal to mature KLK7. Interestingly, this triggering led to an accelerated activation of the serine protease in the presence of trypsin, but not of other tryptic KLKs, such as KLK2, 4, 5, 8, or 11. In summary, we demonstrate a specific interaction between meprin metalloproteases and kallikrein-related peptidases, revealing possible interactions within the proteolytic web.
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Affiliation(s)
- Anke Ohler
- Institute of Zoology, Cell and Matrix Biology, Johannes Gutenberg University, Mainz, Germany
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Sterling HJ, Batchelor JD, Wemmer DE, Williams ER. Effects of buffer loading for electrospray ionization mass spectrometry of a noncovalent protein complex that requires high concentrations of essential salts. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2010; 21:1045-9. [PMID: 20226685 PMCID: PMC2893594 DOI: 10.1016/j.jasms.2010.02.003] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2009] [Revised: 01/29/2010] [Accepted: 02/04/2010] [Indexed: 05/25/2023]
Abstract
Electrospray ionization (ESI) mass spectrometry (MS) is a powerful method for analyzing the active forms of macromolecular complexes of biomolecules. However, these solutions often contain high concentrations of salts and/or detergents that adversely effect ESI performance by making ion formation less reproducible, causing severe adduction or ion suppression. Many methods for separating complexes from nonvolatile additives are routinely used with ESI-MS, but these methods may not be appropriate for complexes that require such stabilizers for activity. Here, the effects of buffer loading using concentrations of ammonium acetate ranging from 0.22 to 1.41 M on the ESI mass spectra of a solution containing a domain truncation mutant of a sigma(54) activator from Aquifex aeolicus were studied. This 44.9 kDa protein requires the presence of millimolar concentrations of Mg(2+), BeF(3)(-), and ADP, (at approximately 60 degrees C) to assemble into an active homo-hexamer. Addition of ammonium acetate can improve signal stability and reproducibility, and can significantly lower adduction and background signals. However, at higher concentrations, the relative ion abundance of the hexamer is diminished, while that of the constituent monomer is enhanced. These results are consistent with loss of enzymatic activity as measured by ATP hydrolysis and indicate that the high concentration of ammonium acetate interferes with assembly of the hexamer. This shows that buffer loading with ammonium acetate is effective for obtaining ESI signal for complexes that require high concentrations of essential salts, but can interfere with formation of, and/or destabilize complexes by disrupting crucial electrostatic interactions at high concentration.
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Affiliation(s)
- Harry J Sterling
- Department of Chemistry, University of California-Berkeley, Berkeley, California 94720, USA
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Gao P, Si LY. Meprin-α metalloproteases enhance lipopolysaccharide-stimulated production of tumour necrosis factor-α and interleukin-1β in peripheral blood mononuclear cells via activation of NF-κB. ACTA ACUST UNITED AC 2010; 160:99-105. [DOI: 10.1016/j.regpep.2009.12.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2009] [Revised: 11/05/2009] [Accepted: 12/14/2009] [Indexed: 12/23/2022]
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Schütte A, Hedrich J, Stöcker W, Becker-Pauly C. Let it flow: Morpholino knockdown in zebrafish embryos reveals a pro-angiogenic effect of the metalloprotease meprin alpha2. PLoS One 2010; 5:e8835. [PMID: 20098618 PMCID: PMC2809112 DOI: 10.1371/journal.pone.0008835] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2009] [Accepted: 01/04/2010] [Indexed: 02/06/2023] Open
Abstract
Background Meprin metalloproteases are thought to be involved in basic physiological functions such as cell proliferation and tissue differentiation. However, the specific functions of these enzymes are still ambiguous, although a variety of growth factors and structural proteins have been identified as meprin substrates. The discovery of meprins α1, α2 and β in teleost fish provided the basis for uncovering their physiological functions by gene silencing in vivo. Methodology/Principal Findings A Morpholino knockdown in zebrafish embryos targeting meprin α1 and β mRNA caused defects in general tissue differentiation. But meprin α2 morphants were affected more specifically and showed severe failures in the formation of the vascular system provoking the hypothesis of a pro-angiogenic effect. The blood circulation was largely diminished resulting in erythrocyte accumulation. These phenotypes mimic a previously described VEGF-A morphant, revealing a possible role of meprin α in VEGF-A activation. Indeed, human recombinant meprin α processed the vascular endothelial growth factor-A (VEGF-A) specifically, revealing the same cleavage products detectable for VEGF from zebrafish whole lysate. Conclusions/Significance Our results demonstrate that meprin metalloproteases are important for cell differentiation and proliferation already during embryogenesis, predominantly by the activation of growth factors. Thus, we conclude that meprins play a significant role in VEGF-A processing, subsequently regulating angiogenesis. Therefore, meprin α might be a new therapeutic target in cardiovascular diseases or in tumor growth inhibition.
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Affiliation(s)
- André Schütte
- Institute of Zoology, Cell and Matrix Biology, Johannes Gutenberg-University, Mainz, Germany
| | - Jana Hedrich
- Institute of Zoology, Cell and Matrix Biology, Johannes Gutenberg-University, Mainz, Germany
| | - Walter Stöcker
- Institute of Zoology, Cell and Matrix Biology, Johannes Gutenberg-University, Mainz, Germany
| | - Christoph Becker-Pauly
- Institute of Zoology, Cell and Matrix Biology, Johannes Gutenberg-University, Mainz, Germany
- * E-mail:
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48
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A meprin inhibitor suppresses atherosclerotic plaque formation in ApoE−/− mice. Atherosclerosis 2009; 207:84-92. [DOI: 10.1016/j.atherosclerosis.2009.04.036] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2008] [Revised: 04/27/2009] [Accepted: 04/27/2009] [Indexed: 11/19/2022]
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Specific processing of tenascin-C by the metalloprotease meprinbeta neutralizes its inhibition of cell spreading. Matrix Biol 2009; 29:31-42. [PMID: 19748582 DOI: 10.1016/j.matbio.2009.08.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Revised: 07/17/2009] [Accepted: 08/28/2009] [Indexed: 11/21/2022]
Abstract
The metalloprotease meprin has been implicated in tissue remodelling due to its capability to degrade extracellular matrix components. Here, we investigated the susceptibility of tenascin-C to cleavage by meprinbeta and the functional properties of its proteolytic fragments. A set of monoclonal antibodies against chicken and human tenascin-C allowed the mapping of proteolytic fragments generated by meprinbeta. In chicken tenascin-C, meprinbeta processed all three major splicing variants by removal of 10kDa N-terminal and 38kDa C-terminal peptides, leaving a large central part of subunits intact. A similar cleavage pattern was found for large human tenascin-C variant where two N-terminal peptides (10 or 15kDa) and two C-terminal fragments (40 and 55kDa) were removed from the intact subunit. N-terminal sequencing revealed the exact amino acid positions of cleavage sites. In both chicken and human tenascin-C N-terminal cleavages occurred just before and/or after the heptad repeats involved in subunit oligomerization. In the human protein, an additional cleavage site was identified in the alternative fibronectin type III repeat D. Whereas all these sites are known to be attacked by several other proteases, a unique cleavage by meprinbeta was located to the 7th constant fibronectin type III repeat in both chicken and human tenascin-C, thereby removing the C-terminal domain involved in its anti-adhesive activity. In cell adhesion assays meprinbeta-digested human tenascin-C was not able to interfere with fibronectin-mediated cell spreading, confirming cleavage in the anti-adhesive domain. Whereas the expression of meprinbeta and tenascin-C does not overlap in normal colon tissue, inflamed lesions of the mucosa from patients with Crohn's disease exhibited many meprinbeta-positive leukocytes in regions where tenascin-C was strongly induced. Our data indicate that, at least under pathological conditions, meprinbeta might attack specific functional sites in tenascin-C that are important for its oligomerization and anti-adhesive activity.
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Sun Q, Jin HJ, Bond JS. Disruption of the meprin alpha and beta genes in mice alters homeostasis of monocytes and natural killer cells. Exp Hematol 2009; 37:346-56. [PMID: 19110362 PMCID: PMC2674388 DOI: 10.1016/j.exphem.2008.10.016] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2008] [Revised: 10/27/2008] [Accepted: 10/28/2008] [Indexed: 01/29/2023]
Abstract
Meprin metalloproteases are implicated in inflammatory bowel disease, which involves dysfunction of immune cells. However, the roles of meprins in the immune and hematological system remain uncharacterized. In this report, we demonstrate that meprins were expressed in the hematological system, and meprin alpha/beta null (alpha(-/-)/beta(-/-)) mice had decreased prevalence of resident monocytes and natural killer (NK) cells in blood, with a concomitant accumulation of inflammatory monocytes and NK cells in bone marrow. In contrast, T and B lymphocytes were not affected by meprin deficiency. In response to acute inflammation induced by intraperitoneal injection of thioglycollate, meprin-deficient mice exhibited higher body temperature than wild-type mice, which was correlated with retention of inflammatory monocytes, but persistent low prevalence of NK cells in blood. These results indicate that meprin metalloproteases play important roles in the homeostasis of monocytes and NK cells, and possibly are involved in egress of these two type cells from bone marrow and homing to the periphery. Our findings are the first report to demonstrate that metalloproteases affect homeostasis of leukocytes, which have important implications for understanding physiology of and pathogenesis in the hematological system.
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Affiliation(s)
- Qi Sun
- Pediatric Hematology/Oncology, Department of Pediatrics, Penn State University Children's Hospital, Hershey, Pa., USA.
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