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Ohradanova-Repic A, Machacek C, Donner C, Mühlgrabner V, Petrovčíková E, Zahradníková A, Vičíková K, Hořejší V, Stockinger H, Leksa V. The mannose 6-phosphate/insulin-like growth factor 2 receptor mediates plasminogen-induced efferocytosis. J Leukoc Biol 2019; 105:519-530. [PMID: 30657605 PMCID: PMC6392118 DOI: 10.1002/jlb.1ab0417-160rr] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 12/17/2018] [Accepted: 12/24/2018] [Indexed: 12/14/2022] Open
Abstract
The plasminogen system is harnessed in a wide variety of physiological processes, such as fibrinolysis, cell migration, or efferocytosis; and accordingly, it is essential upon inflammation, tissue remodeling, wound healing, and for homeostatic maintenance in general. Previously, we identified a plasminogen receptor in the mannose 6-phosphate/insulin-like growth factor 2 receptor (M6P/IGF2R, CD222). Here, we demonstrate by means of genetic knockdown, knockout, and rescue approaches combined with functional studies that M6P/IGF2R is up-regulated on the surface of macrophages, recognizes plasminogen exposed on the surface of apoptotic cells, and mediates plasminogen-induced efferocytosis. The level of uptake of plasminogen-coated apoptotic cells inversely correlates with the TNF-α production by phagocytes indicating tissue clearance without inflammation by this mechanism. Our results reveal an up-to-now undetermined function of M6P/IGF2R in clearance of apoptotic cells, which is crucial for tissue homeostasis.
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Affiliation(s)
- Anna Ohradanova-Repic
- Molecular Immunology Unit, Institute for Hygiene and Applied Immunology, Centre for Pathophysiology, Infectiology & Immunology, Medical University of Vienna, Vienna, Austria
| | - Christian Machacek
- Molecular Immunology Unit, Institute for Hygiene and Applied Immunology, Centre for Pathophysiology, Infectiology & Immunology, Medical University of Vienna, Vienna, Austria
| | - Clemens Donner
- Molecular Immunology Unit, Institute for Hygiene and Applied Immunology, Centre for Pathophysiology, Infectiology & Immunology, Medical University of Vienna, Vienna, Austria
| | - Vanessa Mühlgrabner
- Molecular Immunology Unit, Institute for Hygiene and Applied Immunology, Centre for Pathophysiology, Infectiology & Immunology, Medical University of Vienna, Vienna, Austria
| | - Eva Petrovčíková
- Laboratory of Molecular Immunology, Institute of Molecular Biology, Slovak Academy of Sciences, Bratislava, Slovak Republic.,Department of Biochemistry, Faculty of Natural Sciences, Comenius University, Bratislava, Slovak Republic
| | - Alexandra Zahradníková
- Centre of Biosciences, Slovak Academy of Sciences, Bratislava, Slovak Republic.,Institute of Experimental Endocrinology, Biomedical Research Center, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Kristína Vičíková
- Laboratory of Molecular Immunology, Institute of Molecular Biology, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Václav Hořejší
- Institute of Molecular Genetics of the Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Hannes Stockinger
- Molecular Immunology Unit, Institute for Hygiene and Applied Immunology, Centre for Pathophysiology, Infectiology & Immunology, Medical University of Vienna, Vienna, Austria
| | - Vladimir Leksa
- Molecular Immunology Unit, Institute for Hygiene and Applied Immunology, Centre for Pathophysiology, Infectiology & Immunology, Medical University of Vienna, Vienna, Austria.,Laboratory of Molecular Immunology, Institute of Molecular Biology, Slovak Academy of Sciences, Bratislava, Slovak Republic
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Zwirzitz A, Reiter M, Skrabana R, Ohradanova-Repic A, Majdic O, Gutekova M, Cehlar O, Petrovčíková E, Kutejova E, Stanek G, Stockinger H, Leksa V. Lactoferrin is a natural inhibitor of plasminogen activation. J Biol Chem 2018; 293:8600-8613. [PMID: 29669808 DOI: 10.1074/jbc.ra118.003145] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 04/07/2018] [Indexed: 12/31/2022] Open
Abstract
The plasminogen system is essential for dissolution of fibrin clots, and in addition, it is involved in a wide variety of other physiological processes, including proteolytic activation of growth factors, cell migration, and removal of protein aggregates. On the other hand, uncontrolled plasminogen activation contributes to many pathological processes (e.g. tumor cells' invasion in cancer progression). Moreover, some virulent bacterial species (e.g. Streptococci or Borrelia) bind human plasminogen and hijack the host's plasminogen system to penetrate tissue barriers. Thus, the conversion of plasminogen to the active serine protease plasmin must be tightly regulated. Here, we show that human lactoferrin, an iron-binding milk glycoprotein, blocks plasminogen activation on the cell surface by direct binding to human plasminogen. We mapped the mutual binding sites to the N-terminal region of lactoferrin, encompassed also in the bioactive peptide lactoferricin, and kringle 5 of plasminogen. Finally, lactoferrin blocked tumor cell invasion in vitro and also plasminogen activation driven by Borrelia Our results explain many diverse biological properties of lactoferrin and also suggest that lactoferrin may be useful as a potential tool for therapeutic interventions to prevent both invasive malignant cells and virulent bacteria from penetrating host tissues.
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Affiliation(s)
| | - Michael Reiter
- From the Institute for Hygiene and Applied Immunology and
| | - Rostislav Skrabana
- the Laboratory of Structural Biology of Neurodegeneration, Institute of Neuroimmunology, and
| | | | - Otto Majdic
- Institute of Immunology, Center for Pathophysiology, Infectiology, and Immunology, Medical University of Vienna, A-1090 Vienna, Austria and
| | - Marianna Gutekova
- the Laboratory of Molecular Immunology, Institute of Molecular Biology, Slovak Academy of Sciences, Bratislava 814 38, Slovak Republic
| | - Ondrej Cehlar
- the Laboratory of Structural Biology of Neurodegeneration, Institute of Neuroimmunology, and
| | - Eva Petrovčíková
- the Laboratory of Molecular Immunology, Institute of Molecular Biology, Slovak Academy of Sciences, Bratislava 814 38, Slovak Republic
| | - Eva Kutejova
- the Laboratory of Molecular Immunology, Institute of Molecular Biology, Slovak Academy of Sciences, Bratislava 814 38, Slovak Republic
| | - Gerold Stanek
- From the Institute for Hygiene and Applied Immunology and
| | | | - Vladimir Leksa
- From the Institute for Hygiene and Applied Immunology and .,the Laboratory of Molecular Immunology, Institute of Molecular Biology, Slovak Academy of Sciences, Bratislava 814 38, Slovak Republic
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