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Kocsis A, Bartus D, Hirsch E, Józsi M, Hajdú I, Dobó J, Balczer J, Pál G, Gál P. SARS-CoV-2 Nucleocapsid Protein Is Not Responsible for Over-Activation of Complement Lectin Pathway. Int J Mol Sci 2024; 25:7343. [PMID: 39000451 PMCID: PMC11242754 DOI: 10.3390/ijms25137343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2024] [Revised: 06/27/2024] [Accepted: 07/02/2024] [Indexed: 07/16/2024] Open
Abstract
The nucleocapsid (N) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a viral structural protein that is abundant in the circulation of infected individuals. Previous published studies reported controversial data about the role of the N protein in the activation of the complement system. It was suggested that the N protein directly interacts with mannose-binding lectin-associated serine protease-2 (MASP-2) and stimulates lectin pathway overactivation/activity. In order to check these data and to reveal the mechanism of activation, we examined the effect of the N protein on lectin pathway activation. We found that the N protein does not bind to MASP-2 and MASP-1 and it does not stimulate lectin pathway activity in normal human serum. Furthermore, the N protein does not facilitate the activation of zymogen MASP-2, which is MASP-1 dependent. Moreover, the N protein does not boost the enzymatic activity of MASP-2 either on synthetic or on protein substrates. In some of our experiments, we observed that MASP-2 digests the N protein. However, it is questionable, whether this activity is biologically relevant. Although surface-bound N protein did not activate the lectin pathway, it did trigger the alternative pathway in 10% human serum. Additionally, we detected some classical pathway activation by the N protein. Nevertheless, we demonstrated that this activation was induced by the bound nucleic acid, rather than by the N protein itself.
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Affiliation(s)
- Andrea Kocsis
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, H-1117 Budapest, Hungary
| | - Dalma Bartus
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, H-1117 Budapest, Hungary
| | - Edit Hirsch
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, H-1111 Budapest, Hungary
| | - Mihály Józsi
- Department of Immunology, ELTE Eötvös Loránd University, H-1117 Budapest, Hungary
- HUN-REN-ELTE Complement Research Group, Hungarian Research Network, H-1117 Budapest, Hungary
| | - István Hajdú
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, H-1117 Budapest, Hungary
| | - József Dobó
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, H-1117 Budapest, Hungary
| | - Júlia Balczer
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, H-1117 Budapest, Hungary
| | - Gábor Pál
- Department of Biochemistry, ELTE Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Péter Gál
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, H-1117 Budapest, Hungary
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2
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Demeter F, Németh Z, Kajdácsi E, Bihari G, Dobó J, Gál P, Cervenak L. Detrimental interactions of hypoxia and complement MASP-1 in endothelial cells as a model for atherosclerosis-related diseases. Sci Rep 2024; 14:14882. [PMID: 38937560 PMCID: PMC11211410 DOI: 10.1038/s41598-024-64479-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 06/10/2024] [Indexed: 06/29/2024] Open
Abstract
Both hypoxia and the complement lectin pathway (CLP) are involved in atherosclerosis and atherosclerosis-related stroke and acute myocardial infarction (AMI). We have previously shown that mannose-binding lectin-associated serine protease-1 (MASP-1), the most abundant enzyme of CLP, induces an inflammatory phenotype of endothelial cells (ECs) by cleaving protease activated receptors (PARs). In the absence of data, we aimed to investigate whether hypoxia and MASP-1 interact at the level of ECs, to better understand their role in atherosclerosis-related diseases. Hypoxia attenuated the wound healing ability of ECs, increased ICAM-1 and decreased ICAM-2 expression and upregulated PAR2 gene expression. Hypoxia and MASP-1 increased GROα and IL-8 production, and endothelial permeability without potentiating each other's effects, whereas they cooperatively disrupted vascular network integrity, activated the Ca2+, CREB and NFκB signaling pathways, and upregulated the expression of E-selectin, a crucial adhesion molecule in neutrophil homing. VCAM-1 expression was not influenced either by hypoxia, or by MASP-1. In summary, hypoxia potentiates the effect of MASP-1 on ECs, at least partially by increasing PAR expression, resulting in interaction at several levels, which may altogether exacerbate stroke and AMI progression. Our findings suggest that MASP-1 is a potential drug target in the acute phase of atherosclerosis-related diseases.
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Affiliation(s)
- Flóra Demeter
- Research Laboratory, Department of Internal Medicine and Haematology, Semmelweis University, Szentkirályi U. 46, Budapest, 1088, Hungary
| | - Zsuzsanna Németh
- Research Laboratory, Department of Internal Medicine and Haematology, Semmelweis University, Szentkirályi U. 46, Budapest, 1088, Hungary
| | - Erika Kajdácsi
- Research Laboratory, Department of Internal Medicine and Haematology, Semmelweis University, Szentkirályi U. 46, Budapest, 1088, Hungary
- Research Group for Immunology and Hematology, Semmelweis University-HUN-REN-SU (Office for Supported Research Groups), Budapest, Hungary
| | - György Bihari
- Research Laboratory, Department of Internal Medicine and Haematology, Semmelweis University, Szentkirályi U. 46, Budapest, 1088, Hungary
| | - József Dobó
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, Budapest, Hungary
| | - Péter Gál
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, Budapest, Hungary
| | - László Cervenak
- Research Laboratory, Department of Internal Medicine and Haematology, Semmelweis University, Szentkirályi U. 46, Budapest, 1088, Hungary.
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Németh Z, Demeter F, Dobó J, Gál P, Cervenak L. Complement MASP-1 Modifies Endothelial Wound Healing. Int J Mol Sci 2024; 25:4048. [PMID: 38612857 PMCID: PMC11012537 DOI: 10.3390/ijms25074048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 04/01/2024] [Accepted: 04/03/2024] [Indexed: 04/14/2024] Open
Abstract
Endothelial wound-healing processes are fundamental for the maintenance and restoration of the circulatory system and are greatly affected by the factors present in the blood. We have previously shown that the complement protein mannan-binding lectin-associated serine protease-1 (MASP-1) induces the proinflammatory activation of endothelial cells and is able to cooperate with other proinflammatory activators. Our aim was to investigate the combined effect of mechanical wounding and MASP-1 on endothelial cells. Transcriptomic analysis showed that MASP-1 alters the expression of wound-healing-related and angiogenesis-related genes. Both wounding and MASP-1 induced Ca2+ mobilization when applied individually. However, MASP-1-induced Ca2+ mobilization was inhibited when the treatment was preceded by wounding. Mechanical wounding promoted CREB phosphorylation, and the presence of MASP-1 enhanced this effect. Wounding induced ICAM-1 and VCAM-1 expression on endothelial cells, and MASP-1 pretreatment further increased VCAM-1 levels. MASP-1 played a role in the subsequent stages of angiogenesis, facilitating the breakdown of the endothelial capillary network on Matrigel®. Our findings extend our general understanding of endothelial wound healing and highlight the importance of complement MASP-1 activation in wound-healing processes.
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Affiliation(s)
- Zsuzsanna Németh
- Department of Internal Medicine and Haematology, Semmelweis University, 1085 Budapest, Hungary; (Z.N.)
| | - Flóra Demeter
- Department of Internal Medicine and Haematology, Semmelweis University, 1085 Budapest, Hungary; (Z.N.)
| | - József Dobó
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, 1117 Budapest, Hungary
| | - Péter Gál
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, 1117 Budapest, Hungary
| | - László Cervenak
- Department of Internal Medicine and Haematology, Semmelweis University, 1085 Budapest, Hungary; (Z.N.)
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Dobó J, Kocsis A, Farkas B, Demeter F, Cervenak L, Gál P. The Lectin Pathway of the Complement System-Activation, Regulation, Disease Connections and Interplay with Other (Proteolytic) Systems. Int J Mol Sci 2024; 25:1566. [PMID: 38338844 PMCID: PMC10855846 DOI: 10.3390/ijms25031566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 01/22/2024] [Accepted: 01/24/2024] [Indexed: 02/12/2024] Open
Abstract
The complement system is the other major proteolytic cascade in the blood of vertebrates besides the coagulation-fibrinolytic system. Among the three main activation routes of complement, the lectin pathway (LP) has been discovered the latest, and it is still the subject of intense research. Mannose-binding lectin (MBL), other collectins, and ficolins are collectively termed as the pattern recognition molecules (PRMs) of the LP, and they are responsible for targeting LP activation to molecular patterns, e.g., on bacteria. MBL-associated serine proteases (MASPs) are the effectors, while MBL-associated proteins (MAps) have regulatory functions. Two serine protease components, MASP-1 and MASP-2, trigger the LP activation, while the third component, MASP-3, is involved in the function of the alternative pathway (AP) of complement. Besides their functions within the complement system, certain LP components have secondary ("moonlighting") functions, e.g., in embryonic development. They also contribute to blood coagulation, and some might have tumor suppressing roles. Uncontrolled complement activation can contribute to the progression of many diseases (e.g., stroke, kidney diseases, thrombotic complications, and COVID-19). In most cases, the lectin pathway has also been implicated. In this review, we summarize the history of the lectin pathway, introduce their components, describe its activation and regulation, its roles within the complement cascade, its connections to blood coagulation, and its direct cellular effects. Special emphasis is placed on disease connections and the non-canonical functions of LP components.
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Affiliation(s)
- József Dobó
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, 1117 Budapest, Hungary; (J.D.); (A.K.); (B.F.)
| | - Andrea Kocsis
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, 1117 Budapest, Hungary; (J.D.); (A.K.); (B.F.)
| | - Bence Farkas
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, 1117 Budapest, Hungary; (J.D.); (A.K.); (B.F.)
| | - Flóra Demeter
- Cell Biology and Cell Therapy Group, Research Laboratory, Department of Internal Medicine and Hematology, Semmelweis University, 1085 Budapest, Hungary; (F.D.); (L.C.)
| | - László Cervenak
- Cell Biology and Cell Therapy Group, Research Laboratory, Department of Internal Medicine and Hematology, Semmelweis University, 1085 Budapest, Hungary; (F.D.); (L.C.)
| | - Péter Gál
- Institute of Molecular Life Sciences, HUN-REN Research Centre for Natural Sciences, Hungarian Research Network, 1117 Budapest, Hungary; (J.D.); (A.K.); (B.F.)
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Németh Z, Debreczeni ML, Kajdácsi E, Dobó J, Gál P, Cervenak L. Cooperation of Complement MASP-1 with Other Proinflammatory Factors to Enhance the Activation of Endothelial Cells. Int J Mol Sci 2023; 24:ijms24119181. [PMID: 37298134 DOI: 10.3390/ijms24119181] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 05/15/2023] [Accepted: 05/17/2023] [Indexed: 06/12/2023] Open
Abstract
Endothelial cells play an important role in sensing danger signals and regulating inflammation. Several factors are capable of inducing a proinflammatory response (e.g., LPS, histamine, IFNγ, and bradykinin), and these factors act simultaneously during the natural course of the inflammatory reaction. We have previously shown that the complement protein mannan-binding lectin-associated serine protease-1 (MASP-1) also induces a proinflammatory activation of the endothelial cells. Our aim was to investigate the possible cooperation between MASP-1 and other proinflammatory mediators when they are present in low doses. We used HUVECs and measured Ca2+ mobilization, IL-8, E-selectin, VCAM-1 expression, endothelial permeability, and mRNA levels of specific receptors. LPS pretreatment increased the expression of PAR2, a MASP-1 receptor, and furthermore, MASP-1 and LPS enhanced each other's effects in regulating IL-8, E-selectin, Ca2+ mobilization, and changes in permeability in a variety of ways. Cotreatment of MASP-1 and IFNγ increased the IL-8 expression of HUVECs. MASP-1 induced bradykinin and histamine receptor expression, and consequently, increased Ca2+ mobilization was found. Pretreatment with IFNγ enhanced MASP-1-induced Ca2+ mobilization. Our findings highlight that well-known proinflammatory mediators and MASP-1, even at low effective doses, can strongly synergize to enhance the inflammatory response of endothelial cells.
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Affiliation(s)
- Zsuzsanna Németh
- Department of Internal Medicine and Haematology, Semmelweis University, 1085 Budapest, Hungary
| | - Márta L Debreczeni
- Department of Internal Medicine and Haematology, Semmelweis University, 1085 Budapest, Hungary
| | - Erika Kajdácsi
- Department of Internal Medicine and Haematology, Semmelweis University, 1085 Budapest, Hungary
- Research Group for Immunology and Haematology, Semmelweis University-Eötvös Loránd Research Network (Office for Supported Research Groups), 1052 Budapest, Hungary
| | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, 1117 Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, 1117 Budapest, Hungary
| | - László Cervenak
- Department of Internal Medicine and Haematology, Semmelweis University, 1085 Budapest, Hungary
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6
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Dani R, Oroszlán G, Martinusz R, Farkas B, Dobos B, Vadas E, Závodszky P, Gál P, Dobó J. Quantification of the zymogenicity and the substrate-induced activity enhancement of complement factor D. Front Immunol 2023; 14:1197023. [PMID: 37283768 PMCID: PMC10239819 DOI: 10.3389/fimmu.2023.1197023] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 05/04/2023] [Indexed: 06/08/2023] Open
Abstract
Complement factor D (FD) is a serine protease present predominantly in the active form in circulation. It is synthesized as a zymogen (pro-FD), but it is continuously converted to FD by circulating active MASP-3. FD is a unique, self-inhibited protease. It has an extremely low activity toward free factor B (FB), while it is a highly efficient enzyme toward FB complexed with C3b (C3bB). The structural basis of this phenomenon is known; however, the rate enhancement was not yet quantified. It has also been unknown whether pro-FD has any enzymatic activity. In this study, we aimed to measure the activity of human FD and pro-FD toward uncomplexed FB and C3bB in order to quantitatively characterize the substrate-induced activity enhancement and zymogenicity of FD. Pro-FD was stabilized in the proenzyme form by replacing Arg25 (precursor numbering) with Gln (pro-FD-R/Q). Activated MASP-1 and MASP-3 catalytic fragments were also included in the study for comparison. We found that the complex formation with C3b enhanced the cleavage rate of FB by FD approximately 20 million-fold. C3bB was also a better substrate for MASP-1, approximately 100-fold, than free FB, showing that binding to C3b renders the scissile Arg-Lys bond in FB to become more accessible for proteolysis. Though easily measurable, this cleavage by MASP-1 is not relevant physiologically. Our approach provides quantitative data for the two-step mechanism characterized by the enhanced susceptibility of FB for cleavage upon complex formation with C3b and the substrate-induced activity enhancement of FD upon its binding to C3bB. Earlier MASP-3 was also implicated as a potential FB activator; however, MASP-3 does not cleave C3bB (or FB) at an appreciable rate. Finally, pro-FD cleaves C3bB at a rate that could be physiologically significant. The zymogenicity of FD is approximately 800, i.e., the cleavage rate of C3bB by pro-FD-R/Q was found to be approximately 800-fold lower than that by FD. Moreover, pro-FD-R/Q at approximately 50-fold of the physiological FD concentration could restore half-maximal AP activity of FD-depleted human serum on zymosan. The observed zymogen activity of pro-FD might be relevant in MASP-3 deficiency cases or during therapeutic MASP-3 inhibition.
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Affiliation(s)
| | | | | | | | | | | | | | | | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary
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Dobó J, Kocsis A, Dani R, Gál P. Proprotein Convertases and the Complement System. Front Immunol 2022; 13:958121. [PMID: 35874789 PMCID: PMC9296861 DOI: 10.3389/fimmu.2022.958121] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 06/13/2022] [Indexed: 11/27/2022] Open
Abstract
Proteins destined for secretion - after removal of the signal sequence - often undergo further proteolytic processing by proprotein convertases (PCs). Prohormones are typically processed in the regulated secretory pathway, while most plasma proteins travel though the constitutive pathway. The complement system is a major proteolytic cascade in the blood, serving as a first line of defense against microbes and also contributing to the immune homeostasis. Several complement components, namely C3, C4, C5 and factor I (FI), are multi-chain proteins that are apparently processed by PCs intracellularly. Cleavage occurs at consecutive basic residues and probably also involves the action of carboxypeptidases. The most likely candidate for the intracellular processing of complement proteins is furin, however, because of the overlapping specificities of basic amino acid residue-specific proprotein convertases, other PCs might be involved. To our surprise, we have recently discovered that processing of another complement protein, mannan-binding lectin-associated serine protease-3 (MASP-3) occurs in the blood by PCSK6 (PACE4). A similar mechanism had been described for the membrane protease corin, which is also activated extracellularly by PCSK6. In this review we intend to point out that the proper functioning of the complement system intimately depends on the action of proprotein convertases. In addition to the non-enzymatic components (C3, C4, C5), two constitutively active complement proteases are directly activated by PCs either intracellularly (FI), or extracellularly (MASP-3), moreover indirectly, through the constitutive activation of pro-factor D by MASP-3, the activity of the alternative pathway also depends on a PC present in the blood.
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Affiliation(s)
| | | | | | - Péter Gál
- *Correspondence: József Dobó, ; Péter Gál,
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Wei M, Guo WY, Xu BY, Shi SF, Liu LJ, Zhou XJ, Lv JC, Zhu L, Zhang H. Collectin11 and Complement Activation in IgA Nephropathy. Clin J Am Soc Nephrol 2021; 16:1840-1850. [PMID: 34615657 PMCID: PMC8729485 DOI: 10.2215/cjn.04300321] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 09/18/2021] [Indexed: 02/04/2023]
Abstract
BACKGROUND AND OBJECTIVES IgA nephropathy is the most common primary GN worldwide. Previous research demonstrated that collectin11, an initiator of the complement lectin pathway, was involved in both AKI and chronic tubulointerstitial fibrosis. Here, we investigated the potential role of collectin11 in the pathogenesis of IgA nephropathy. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS The deposition of collectin11 and other complement proteins was detected in glomeruli of 60 participants with IgA nephropathy by immunofluorescence. In vitro, human mesangial cells were treated with IgA1-containing immune complexes derived from participants with IgA nephropathy. Then, the expression of collectin11 in mesangial cells was examined by quantitative RT-PCR and immunofluorescence. The codeposition of collectin11 with IgA1 or C3 on mesangial cells was detected by immunofluorescence and proximity ligation assays. RESULTS In total, 37% of participants with IgA nephropathy (22 of 60) showed codeposition of collectin11 with IgA in the glomerular mesangium. Using an injury model of mesangial cells, we demonstrated that IgA1-immune complexes derived from participants with IgA nephropathy increased the secretion of collectin11 in mesangial cells with the subsequent deposition of collectin11 on the cell surface via the interaction with deposited IgA1-immune complexes. In vitro, we found that collectin11 bound to IgA1-immune complexes in a dose-dependent but calcium-independent manner. Furthermore, deposited collectin11 initiated the activation of complement and accelerated the deposition of C3 on mesangial cells. CONCLUSIONS In situ-produced collectin11 by mesangial cells might play an essential role in kidney injury in a subset of patients with IgA nephropathy through the induction of complement activation.
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Affiliation(s)
- Min Wei
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China,Peking University Institute of Nephrology, Beijing, China,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China,Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | - Wei-yi Guo
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China,Peking University Institute of Nephrology, Beijing, China,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China,Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | - Bo-yang Xu
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China,Peking University Institute of Nephrology, Beijing, China,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China,Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | - Su-fang Shi
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China,Peking University Institute of Nephrology, Beijing, China,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China,Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | - Li-jun Liu
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China,Peking University Institute of Nephrology, Beijing, China,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China,Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | - Xu-jie Zhou
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China,Peking University Institute of Nephrology, Beijing, China,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China,Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | - Ji-cheng Lv
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China,Peking University Institute of Nephrology, Beijing, China,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China,Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | - Li Zhu
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China,Peking University Institute of Nephrology, Beijing, China,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China,Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing, China
| | - Hong Zhang
- Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China,Peking University Institute of Nephrology, Beijing, China,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China,Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing, China
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9
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Characterization of DNA-protein complexes by nanoparticle tracking analysis and their association with systemic lupus erythematosus. Proc Natl Acad Sci U S A 2021; 118:2106647118. [PMID: 34301873 DOI: 10.1073/pnas.2106647118] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Nanotechnology enables investigations of single biomacromolecules, but technical challenges have limited the application in liquid biopsies, for example, blood plasma. Nonetheless, tools to characterize single molecular species in such samples represent a significant unmet need with the increasing appreciation of the physiological importance of protein structural changes at nanometer scale. Mannose-binding lectin (MBL) is an oligomeric plasma protein and part of the innate immune system through its ability to activate complement. MBL also serves a role as a scavenger for cellular debris, especially DNA. This may link functions of MBL with several inflammatory diseases in which cell-free DNA now appears to play a role, but mechanistic insight has been lacking. By making nanoparticle tracking analysis possible in human plasma, we now show that superoligomeric structures of MBL form nanoparticles with DNA. These oligomers correlate with disease activity in systemic lupus erythematosus patients. With the direct quantification of the hydrodynamic radius, calculations following the principles of Taylor dispersion in the blood stream connect the size of these complexes to endothelial inflammation, which is among the most important morbidities in lupus. Mechanistic insight from an animal model of lupus supported that DNA-stabilized superoligomers stimulate the formation of germinal center B cells and drive loss of immunological tolerance. The formation involves an inverse relationship between the concentration of MBL superoligomers and antibodies to double-stranded DNA. Our approach implicates the structure of DNA-protein nanoparticulates in the pathobiology of autoimmune diseases.
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10
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Oroszlán G, Dani R, Végh BM, Varga D, Ács AV, Pál G, Závodszky P, Farkas H, Gál P, Dobó J. Proprotein Convertase Is the Highest-Level Activator of the Alternative Complement Pathway in the Blood. THE JOURNAL OF IMMUNOLOGY 2021; 206:2198-2205. [PMID: 33858964 DOI: 10.4049/jimmunol.2000636] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 03/01/2021] [Indexed: 12/17/2022]
Abstract
Factor D (FD) is an essential element of the alternative pathway of the complement system, and it circulates predominantly in cleaved, activated form in the blood. In resting blood, mannose-binding lectin-associated serine protease 3 (MASP-3) is the exclusive activator of pro-FD. Similarly to FD, MASP-3 also circulates mainly in the active form. It was not clear, however, how zymogen MASP-3 is activated. To decipher its activation mechanism, we followed the cleavage of MASP-3 in human hirudin plasma. Our data suggest that neither lectin pathway proteases nor any protease controlled by C1-inhibitor are required for MASP-3 activation. However, EDTA and the general proprotein convertase inhibitor decanoyl-RVKR-chloromethylketone completely prevented activation of exogenous MASP-3 added to blood samples. In this study, we show that proprotein convertase subtilisin/kexin (PCSK) 5 and PCSK6 are able to activate MASP-3 in vitro. Unlike PCSK5, PCSK6 was detected in human serum and plasma, and previously PCSK6 had also been shown to activate corin in the circulation. In all, PCSK6 emerges as the MASP-3 activator in human blood. These findings clarify the very first step of the activation of the alternative pathway and also connect the complement and the proprotein convertase systems in the blood.
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Affiliation(s)
- Gábor Oroszlán
- Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Ráhel Dani
- Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Barbara M Végh
- Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary.,Department of Biochemistry, Eötvös Loránd University, Budapest, Hungary; and
| | - Dóra Varga
- Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Andrea V Ács
- Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Gábor Pál
- Department of Biochemistry, Eötvös Loránd University, Budapest, Hungary; and
| | - Péter Závodszky
- Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Henriette Farkas
- Hungarian Angioedema Center of Reference and Excellence, Department of Internal Medicine and Haematology, Semmelweis University, Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary;
| | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary;
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11
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Zewde NT, Hsu RV, Morikis D, Palermo G. Systems Biology Modeling of the Complement System Under Immune Susceptible Pathogens. FRONTIERS IN PHYSICS 2021; 9:603704. [PMID: 35145963 PMCID: PMC8827490 DOI: 10.3389/fphy.2021.603704] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The complement system is assembled from a network of proteins that function to bring about the first line of defense of the body against invading pathogens. However, complement deficiencies or invasive pathogens can hijack complement to subsequently increase susceptibility of the body to infections. Moreover, invasive pathogens are increasingly becoming resistant to the currently available therapies. Hence, it is important to gain insights into the highly dynamic interaction between complement and invading microbes in the frontlines of immunity. Here, we developed a mathematical model of the complement system composed of 670 ordinary differential equations with 328 kinetic parameters, which describes all three complement pathways (alternative, classical, and lectin) and includes description of mannose-binding lectin, collectins, ficolins, factor H-related proteins, immunoglobulin M, and pentraxins. Additionally, we incorporate two pathogens: (type 1) complement susceptible pathogen and (type 2) Neisseria meningitidis located in either nasopharynx or bloodstream. In both cases, we generate time profiles of the pathogen surface occupied by complement components and the membrane attack complex (MAC). Our model shows both pathogen types in bloodstream are saturated by complement proteins, whereas MACs occupy <<1.0% of the pathogen surface. Conversely, the MAC production in nasopharynx occupies about 1.5-10% of the total N. meningitidis surface, thus making nasal MAC levels at least about eight orders of magnitude higher. Altogether, we predict complement-imbalance, favoring overactivation, is associated with nasopharynx homeostasis. Conversely, orientating toward complement-balance may cause disruption to the nasopharynx homeostasis. Thus, for sporadic meningococcal disease, our model predicts rising nasal levels of complement regulators as early infection biomarkers.
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Affiliation(s)
- Nehemiah T. Zewde
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States
| | - Rohaine V. Hsu
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States
| | - Dimitrios Morikis
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States
- Correspondence: Giulia Palermo, , Dimitrios Morikis,
| | - Giulia Palermo
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States
- Department of Chemistry, University of California, Riverside, Riverside, CA, United States
- Correspondence: Giulia Palermo, , Dimitrios Morikis,
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12
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Bumiller-Bini V, de Freitas Oliveira-Toré C, Carvalho TM, Kretzschmar GC, Gonçalves LB, Alencar NDM, Gasparetto MA, Beltrame MH, Winter Boldt AB. MASPs at the crossroad between the complement and the coagulation cascades - the case for COVID-19. Genet Mol Biol 2021; 44:e20200199. [PMID: 33729332 PMCID: PMC7982787 DOI: 10.1590/1678-4685-gmb-2020-0199] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 01/20/2021] [Indexed: 01/08/2023] Open
Abstract
Components of the complement system and atypical parameters of coagulation were reported in COVID-19 patients, as well as the exacerbation of the inflammation and coagulation activity. Mannose binding lectin (MBL)- associated serine proteases (MASPs) play an important role in viral recognition and subsequent activation of the lectin pathway of the complement system and blood coagulation, connecting both processes. Genetic variants of MASP1 and MASP2 genes are further associated with different levels and functional efficiency of their encoded proteins, modulating susceptibility and severity to diseases. Our review highlights the possible role of MASPs in SARS-COV-2 binding and activation of the lectin pathway and blood coagulation cascades, as well as their associations with comorbidities of COVID-19. MASP-1 and/or MASP-2 present an increased expression in patients with COVID-19 risk factors: diabetes, arterial hypertension and cardiovascular disease, chronic kidney disease, chronic obstructive pulmonary disease, and cerebrovascular disease. Based also on the positive results of COVID-19 patients with anti-MASP-2 antibody, we propose the use of MASPs as a possible biomarker of the progression of COVID-19 and the investigation of new treatment strategies taking into consideration the dual role of MASPs, including MASP inhibitors as promising therapeutic targets against COVID-19.
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Affiliation(s)
- Valéria Bumiller-Bini
- Universidade Federal do Paraná (UFPR), Departamento de Genética, Laboratório de Genética Molecular Humana, Curitiba, PR, Brazil
- Universidade Federal do Paraná (UFPR), Departamento de Genética, Programa de Pós-Graduação em Genética, Curitiba, PR, Brazil
| | - Camila de Freitas Oliveira-Toré
- Universidade Federal do Paraná (UFPR), Programa de Pós-Graduação em Medicina Interna e Ciências da Saúde, Laboratório de Imunopatologia Molecular, Curitiba, PR, Brazil
| | - Tamyres Mingorance Carvalho
- Universidade Federal do Paraná (UFPR), Departamento de Genética, Programa de Pós-Graduação em Genética, Curitiba, PR, Brazil
- Universidade Federal do Paraná, Departamento de Genética, Laboratório de Citogenética Humana e Oncogenética, Curitiba, PR, Brazil
| | - Gabriela Canalli Kretzschmar
- Universidade Federal do Paraná (UFPR), Departamento de Genética, Laboratório de Genética Molecular Humana, Curitiba, PR, Brazil
- Universidade Federal do Paraná (UFPR), Departamento de Genética, Programa de Pós-Graduação em Genética, Curitiba, PR, Brazil
| | - Letícia Boslooper Gonçalves
- Universidade Federal do Paraná (UFPR), Departamento de Genética, Programa de Pós-Graduação em Genética, Curitiba, PR, Brazil
- Universidade Federal do Paraná (UFPR), Departamento de Genética, Laboratório de Imunogenética e Histocompatibilidade (LIGH), Curitiba, PR, Brazil
| | - Nina de Moura Alencar
- Fundação Oswaldo Cruz (Fiocruz), Instituto Carlos Chagas, Programa de Pós-Graduação em Biociências e Biotecnologia, Laboratório de Virologia Molecular, Curitiba, PR, Brazil
| | - Miguel Angelo Gasparetto
- Universidade Federal do Paraná (UFPR), Departamento de Genética, Laboratório de Genética Molecular Humana, Curitiba, PR, Brazil
| | - Marcia Holsbach Beltrame
- Universidade Federal do Paraná (UFPR), Departamento de Genética, Laboratório de Genética Molecular Humana, Curitiba, PR, Brazil
| | - Angelica Beate Winter Boldt
- Universidade Federal do Paraná (UFPR), Departamento de Genética, Laboratório de Genética Molecular Humana, Curitiba, PR, Brazil
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13
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O’Brien RM, Cannon A, Reynolds JV, Lysaght J, Lynam-Lennon N. Complement in Tumourigenesis and the Response to Cancer Therapy. Cancers (Basel) 2021; 13:1209. [PMID: 33802004 PMCID: PMC7998562 DOI: 10.3390/cancers13061209] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 03/04/2021] [Accepted: 03/05/2021] [Indexed: 12/16/2022] Open
Abstract
In recent years, our knowledge of the complement system beyond innate immunity has progressed significantly. A modern understanding is that the complement system has a multifaceted role in malignancy, impacting carcinogenesis, the acquisition of a metastatic phenotype and response to therapies. The ability of local immune cells to produce and respond to complement components has provided valuable insights into their regulation, and the subsequent remodeling of the tumour microenvironment. These novel discoveries have advanced our understanding of the immunosuppressive mechanisms supporting tumour growth and uncovered potential therapeutic targets. This review discusses the current understanding of complement in cancer, outlining both direct and immune cell-mediated roles. The role of complement in response to therapies such as chemotherapy, radiation and immunotherapy is also presented. While complement activities are largely context and cancer type-dependent, it is evident that promising therapeutic avenues have been identified, in particular in combination therapies.
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Affiliation(s)
- Rebecca M. O’Brien
- Department of Surgery, Trinity St. James’s Cancer Institute, Trinity Translational Medicine Institute, Trinity College Dublin and St. James’s Hospital, Dublin 8, Ireland; (R.M.O.); (A.C.); (J.V.R.); (J.L.)
- Cancer Immunology and Immunotherapy Group, Trinity St. James’s Cancer Institute, Trinity Translational Medicine Institute, Trinity College Dublin and St. James’s Hospital, Dublin 8, Ireland
| | - Aoife Cannon
- Department of Surgery, Trinity St. James’s Cancer Institute, Trinity Translational Medicine Institute, Trinity College Dublin and St. James’s Hospital, Dublin 8, Ireland; (R.M.O.); (A.C.); (J.V.R.); (J.L.)
| | - John V. Reynolds
- Department of Surgery, Trinity St. James’s Cancer Institute, Trinity Translational Medicine Institute, Trinity College Dublin and St. James’s Hospital, Dublin 8, Ireland; (R.M.O.); (A.C.); (J.V.R.); (J.L.)
| | - Joanne Lysaght
- Department of Surgery, Trinity St. James’s Cancer Institute, Trinity Translational Medicine Institute, Trinity College Dublin and St. James’s Hospital, Dublin 8, Ireland; (R.M.O.); (A.C.); (J.V.R.); (J.L.)
- Cancer Immunology and Immunotherapy Group, Trinity St. James’s Cancer Institute, Trinity Translational Medicine Institute, Trinity College Dublin and St. James’s Hospital, Dublin 8, Ireland
| | - Niamh Lynam-Lennon
- Department of Surgery, Trinity St. James’s Cancer Institute, Trinity Translational Medicine Institute, Trinity College Dublin and St. James’s Hospital, Dublin 8, Ireland; (R.M.O.); (A.C.); (J.V.R.); (J.L.)
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14
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Li Y, Liu X, Tang P, Zhang H, Qin Q, Zhang Z. Genome sequence and organization of the Mythimna (formerly Pseudaletia) unipuncta granulovirus Hawaiian strain. Sci Rep 2021; 11:414. [PMID: 33432025 PMCID: PMC7801670 DOI: 10.1038/s41598-020-80117-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 12/17/2020] [Indexed: 11/14/2022] Open
Abstract
Purified occlusion bodies (OBs) of Mythimna (formerly Pseudaletia) unipuncta (the true armyworm) granulovirus Hawaiian strain (MyunGV-A) were observed, showing typical GV morphological characteristics under scanning and transmission electron microscopy (EM). The genome of MyunGV-A was completely sequenced and analysed. The genome is 176,677 bp in size, with a G+C content of 39.79%. It contains 183 open reading frames (ORFs) encoding 50 or more amino acids with minimal overlap. Comparison of MyunGV-A with TnGV, XcGV, and HearGV genomes revealed extensive sequence similarity and collinearity, and the four genomes contain the same nine homologous regions (hrs) with conserved structures and locations. Three unique genes, 12 baculovirus repeated ORF (bro), 2 helicase, and 3 enhancin genes, were identified. In particular, two repeated genes (ORF39 and 49) are present in the genome, in reverse and complementarily orientations. Twenty-four OB proteins were identified from the putative protein database of MyunGV-A. In addition, MyunGV-A belongs to the Betabaculovirus group and is most closely related to TnGV (99% amino acid identity) according to a phylogenetic tree based on the combined amino acid sequences of 38 core gene contents.
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Affiliation(s)
- Yinü Li
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xingjian Liu
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Ping Tang
- Jiangsu University of Science and Technology, Zhenjiang, China
| | - Huan Zhang
- Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Qilian Qin
- Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
| | - Zhifang Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China.
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15
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Pihl R, Jensen RK, Poulsen EC, Jensen L, Hansen AG, Thøgersen IB, Dobó J, Gál P, Andersen GR, Enghild JJ, Thiel S. ITIH4 acts as a protease inhibitor by a novel inhibitory mechanism. SCIENCE ADVANCES 2021; 7:7/2/eaba7381. [PMID: 33523981 PMCID: PMC7793589 DOI: 10.1126/sciadv.aba7381] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 11/16/2020] [Indexed: 05/02/2023]
Abstract
Inter-α-inhibitor heavy chain 4 (ITIH4) is a poorly characterized plasma protein that is proteolytically processed in multiple pathological conditions. However, no biological function of ITIH4 has been identified. Here, we show that ITIH4 is cleaved by several human proteases within a protease-susceptible region, enabling ITIH4 to function as a protease inhibitor. This is exemplified by its inhibition of mannan-binding lectin-associated serine protease-1 (MASP-1), MASP-2, and plasma kallikrein, which are key proteases for intravascular host defense. Mechanistically, ITIH4 acts as bait that, upon cleavage, forms a noncovalent, inhibitory complex with the executing protease that depends on the ITIH4 von Willebrand factor A domain. ITIH4 inhibits the MASPs by sterically preventing larger protein substrates from accessing their active sites, which remain accessible and fully functional toward small substrates. Thus, we demonstrate that ITIH4 functions as a protease inhibitor by a previously undescribed inhibitory mechanism.
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Affiliation(s)
- Rasmus Pihl
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Rasmus K Jensen
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Emil C Poulsen
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Lisbeth Jensen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | | | - Ida B Thøgersen
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Gregers R Andersen
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Jan J Enghild
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Steffen Thiel
- Department of Biomedicine, Aarhus University, Aarhus, Denmark.
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16
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Querino Lima Afonso M, da Fonseca NJ, de Oliveira LC, Lobo FP, Bleicher L. Coevolved Positions Represent Key Functional Properties in the Trypsin-Like Serine Proteases Protein Family. J Chem Inf Model 2020; 60:1060-1068. [DOI: 10.1021/acs.jcim.9b00903] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Marcelo Querino Lima Afonso
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627 - Pampulha, Belo Horizonte, Minas Gerais, Brazil 31270-901
| | - Neli J. da Fonseca
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627 - Pampulha, Belo Horizonte, Minas Gerais, Brazil 31270-901
| | - Lucas Carrijo de Oliveira
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627 - Pampulha, Belo Horizonte, Minas Gerais, Brazil 31270-901
| | - Francisco Pereira Lobo
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627 - Pampulha, Belo Horizonte, Minas Gerais, Brazil 31270-901
| | - Lucas Bleicher
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627 - Pampulha, Belo Horizonte, Minas Gerais, Brazil 31270-901
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17
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Gut Microbiota Disorder, Gut Epithelial and Blood-Brain Barrier Dysfunctions in Etiopathogenesis of Dementia: Molecular Mechanisms and Signaling Pathways. Neuromolecular Med 2019; 21:205-226. [PMID: 31115795 DOI: 10.1007/s12017-019-08547-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Accepted: 05/17/2019] [Indexed: 12/12/2022]
Abstract
Emerging evidences indicate a critical role of the gut microbiota in etiopathogenesis of dementia, a debilitating multifactorial disorder characterized by progressive deterioration of cognition and behavior that interferes with the social and professional functions of the sufferer. Available data suggest that gut microbiota disorder that triggers development of dementia is characterized by substantial reduction in specific species belonging to the Firmicutes and Bacteroidetes phyla and presence of pathogenic species, predominantly, pro-inflammatory bacteria of the Proteobacteria phylum. These changes in gut microbiota microecology promote the production of toxic metabolites and pro-inflammatory cytokines, and reduction in beneficial substances such as short chain fatty acids and other anti-inflammatory factors, thereby, enhancing destruction of the gut epithelial barrier with concomitant activation of local and distant immune cells as well as dysregulation of enteric neurons and glia. This subsequently leads to blood-brain barrier dysfunctions that trigger neuroinflammatory reactions and predisposes to apoptotic neuronal and glial cell death, particularly in the hippocampus and cerebral cortex, which underlie the development of dementia. However, the molecular switches that control these processes in the histo-hematic barriers of the gut and brain are not exactly known. This review integrates very recent data on the molecular mechanisms that link gut microbiota disorder to gut epithelial and blood-brain barrier dysfunctions, underlying the development of dementia. The signaling pathways that link gut microbiota disorder with impairment in cognition and behavior are also discussed. The review also highlights potential therapeutic options for dementia.
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18
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Debreczeni ML, Németh Z, Kajdácsi E, Schwaner E, Makó V, Masszi A, Doleschall Z, Rigó J, Walter FR, Deli MA, Pál G, Dobó J, Gál P, Cervenak L. MASP-1 Increases Endothelial Permeability. Front Immunol 2019; 10:991. [PMID: 31130964 PMCID: PMC6509239 DOI: 10.3389/fimmu.2019.00991] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Accepted: 04/17/2019] [Indexed: 01/13/2023] Open
Abstract
Pathologically increased vascular permeability is an important dysfunction in the pathomechanism of life-threatening conditions, such as sepsis, ischemia/reperfusion, or hereditary angioedema (HAE), diseases accompanied by uncontrolled activation of the complement system. HAE for example is caused by the deficiency of C1-inhibitor (the main regulator of early complement activation), which leads to edematous attacks threatening with circulatory collapse. We have previously reported that endothelial cells become activated during HAE attacks. A natural target of C1-inhibitor is mannan-binding lectin-associated serine protease-1 (MASP-1), a multifunctional serine protease, which plays a key role in the activation of complement lectin pathway. We have previously shown that MASP-1 induces the pro-inflammatory activation of endothelial cells and in this study we investigated whether MASP-1 can directly affect endothelial permeability. All experiments were performed on human umbilical vein endothelial cells (HUVECs). Real-time micro electric sensing revealed that MASP-1 decreases the impedance of HUVEC monolayers and in a recently developed permeability test (XperT), MASP-1 dose-dependently increased endothelial paracellular transport. We show that protease activated receptor-1 mediated intracellular Ca2+-mobilization, Rho-kinase activation dependent myosin light chain (MLC) phosphorylation, cytoskeletal actin rearrangement, and disruption of interendothelial junctions are underlying this phenomenon. Furthermore, in a whole-transcriptome microarray analysis MASP-1 significantly changed the expression of 25 permeability-related genes in HUVECs-for example it up-regulated bradykinin B2 receptor expression. According to our results, MASP-1 has potent permeability increasing effects. During infections or injuries MASP-1 may help eliminate the microbes and/or tissue debris by enhancing the extravasation of soluble and cellular components of the immune system, however, it may also play a role in the pathomechanism of diseases, where edema formation and complement lectin pathway activation are simultaneously present. Our findings also raise the possibility that MASP-1 may be a promising target of anti-edema drug development.
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Affiliation(s)
- Márta L. Debreczeni
- Research Laboratory, 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary
| | - Zsuzsanna Németh
- Research Laboratory, 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary
| | - Erika Kajdácsi
- Research Laboratory, 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary
| | - Endre Schwaner
- Research Laboratory, 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary
| | - Veronika Makó
- MTA-SE Research Group of Immunology and Hematology, Hungarian Academy of Sciences and Semmelweis University, Budapest, Hungary
| | - András Masszi
- Research Laboratory, 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary
| | - Zoltán Doleschall
- Department of Pathogenetics, National Institute of Oncology, Budapest, Hungary
| | - János Rigó
- First Department of Obstetrics and Gynecology, Semmelweis University, Budapest, Hungary
| | - Fruzsina R. Walter
- Biological Research Centre, Institute of Biophysics, Hungarian Academy of Sciences, Szeged, Hungary
| | - Mária A. Deli
- Biological Research Centre, Institute of Biophysics, Hungarian Academy of Sciences, Szeged, Hungary
| | - Gábor Pál
- Department of Biochemistry, Eötvös Loránd University, Budapest, Hungary
| | - József Dobó
- Research Centre for Natural Sciences, Institute of Enzymology, Hungarian Academy of Sciences, Budapest, Hungary
| | - Péter Gál
- Research Centre for Natural Sciences, Institute of Enzymology, Hungarian Academy of Sciences, Budapest, Hungary
| | - László Cervenak
- Research Laboratory, 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary
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19
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Dobó J, Kocsis A, Gál P. Be on Target: Strategies of Targeting Alternative and Lectin Pathway Components in Complement-Mediated Diseases. Front Immunol 2018; 9:1851. [PMID: 30135690 PMCID: PMC6092519 DOI: 10.3389/fimmu.2018.01851] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 07/26/2018] [Indexed: 12/20/2022] Open
Abstract
The complement system has moved into the focus of drug development efforts in the last decade, since its inappropriate or uncontrolled activation has been recognized in many diseases. Some of them are primarily complement-mediated rare diseases, such as paroxysmal nocturnal hemoglobinuria, C3 glomerulonephritis, and atypical hemolytic uremic syndrome. Complement also plays a role in various multifactorial diseases that affect millions of people worldwide, such as ischemia reperfusion injury (myocardial infarction, stroke), age-related macular degeneration, and several neurodegenerative disorders. In this review, we summarize the potential advantages of targeting various complement proteins with special emphasis on the components of the lectin (LP) and the alternative pathways (AP). The serine proteases (MASP-1/2/3, factor D, factor B), which are responsible for the activation of the cascade, are straightforward targets of inhibition, but the pattern recognition molecules (mannose-binding lectin, other collectins, and ficolins), the regulatory components (factor H, factor I, properdin), and C3 are also subjects of drug development. Recent discoveries about cross-talks between the LP and AP offer new approaches for clinical intervention. Mannan-binding lectin-associated serine proteases (MASPs) are not just responsible for LP activation, but they are also indispensable for efficient AP activation. Activated MASP-3 has recently been shown to be the enzyme that continuously supplies factor D (FD) for the AP by cleaving pro-factor D (pro-FD). In this aspect, MASP-3 emerges as a novel feasible target for the regulation of AP activity. MASP-1 was shown to be required for AP activity on various surfaces, first of all on LPS of Gram-negative bacteria.
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Affiliation(s)
- József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Andrea Kocsis
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
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20
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Albuquerque DAP, Cavalcanti IT, Vasconcelos LRS, Montenegro F, Pereira LMMB, Cavalcanti MSM, Moura P, Júnior LBC, de Almeida SMV, Beltrão EIC. Molecular profile of mannan-binding lectin in hepatitis C patients with MBL gene polymorphisms by a modified mannan-coated nitrocellulose assay. J Immunol Methods 2018; 460:101-106. [PMID: 30056939 DOI: 10.1016/j.jim.2018.06.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Revised: 06/25/2018] [Accepted: 06/25/2018] [Indexed: 02/08/2023]
Abstract
The aim of this study was to develop an assay to analyze the serum profile of Mannose-binding lectin (MBL) through a simple and "in-house" method (called "dot-N-man"). Furthermore, the study attempted to associate molecular masses of MBL to the profile of MBL gene polymorphisms in patients with hepatitis C. Heterogeneity in molecular masses of MBL is due to the impairment of oligomers formation, which is linked to genetic polymorphisms in the MBL gene. Individuals with AA genotype (wild-type) produce high-molecular-mass proteins, whereas AO and OO individuals produce intermediate and low-molecular-mass proteins, respectively. Sera of thirty patients carrying the hepatitis C virus (HCV) were investigated using MBL binding assay with mannan-coated nitrocellulose (dot-N-man). Purified MBL was evaluated by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and Western blotting. Dot-N-Man assay yielded MBL with molecular masses ranging between 55 and 320 kDa, comparable to low and high molecular mass forms of MBL. Nonreducing SDS-PAGE showed high molecular mass bands in all AA individuals while bands of 270 and 205 kDa were observed in sera for a number of patients with AO and OO genotypes, respectively. Immunoblotting confirmed the MBL samples obtained from the dot-N-man. These results provide new insights to understand the MBL molecular forms profile in patients infected with HCV- which could be useful in future investigations on the influence of the MBL structure/genotype on both the progression of infection and the response to hepatitis C therapy.
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Affiliation(s)
- Diego A P Albuquerque
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - Igor T Cavalcanti
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - Luydson R S Vasconcelos
- Instituto do Fígado e Transplantes de Pernambuco - IFP, Recife, PE, Brazil; Faculdade de Ciências Médicas, Universidade de Pernambuco (UPE), Recife, PE, Brazil; Instituto de Pesquisas Aggeu Magalhães - FIOCRUZ, Recife, PE, Brazil
| | - Francisco Montenegro
- Laboratório de Biologia Molecular de Vírus, Instituto de Ciências Biológicas, Universidade de Pernambuco, Recife, PE, Brazil
| | - Leila M M B Pereira
- Instituto do Fígado e Transplantes de Pernambuco - IFP, Recife, PE, Brazil; Faculdade de Ciências Médicas, Universidade de Pernambuco (UPE), Recife, PE, Brazil
| | - Maria S M Cavalcanti
- Laboratório de Biologia Molecular de Vírus, Instituto de Ciências Biológicas, Universidade de Pernambuco, Recife, PE, Brazil; Faculdade de Ciências Médicas, Universidade de Pernambuco (UPE), Recife, PE, Brazil
| | - Patrícia Moura
- Laboratório de Biologia Molecular de Vírus, Instituto de Ciências Biológicas, Universidade de Pernambuco, Recife, PE, Brazil; Faculdade de Ciências Médicas, Universidade de Pernambuco (UPE), Recife, PE, Brazil
| | - Luiz B C Júnior
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco, Recife, PE, Brazil; Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - Sinara Mônica Vitalino de Almeida
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco, Recife, PE, Brazil; Universidade de Pernambuco (UPE), Faculdade de Ciências, Educação e Tecnologia de Garanhuns (FACETEG), Garanhuns, PE, Brazil.
| | - Eduardo I C Beltrão
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco, Recife, PE, Brazil; Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Pernambuco, Recife, PE, Brazil
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21
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Dibutyryl cAMP- or Interleukin-6-induced astrocytic differentiation enhances mannose binding lectin (MBL)-associated serine protease (MASP)-1/3 expression in C6 glioma cells. Arch Biochem Biophys 2018; 653:39-49. [PMID: 29963999 DOI: 10.1016/j.abb.2018.06.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 06/26/2018] [Accepted: 06/27/2018] [Indexed: 10/28/2022]
Abstract
Mannose-binding lectin (MBL)-Associated Serine Proteases (MASP)-1 and 3, key enzymes in the lectin complement pathway of innate immune response, are also expressed in glioma cell lines. We investigated MASP-1 and MASP-3 expression during dibutyryl cyclic AMP (dbcAMP)- or Interleukin-6 (rIL-6)-induced astrocytic differentiation of C6 glioma cells. Our results demonstrate that C6 cells express basal levels of MASP-1 and MASP-3 and following exposure to dbcAMP or IL-6, a consistent MASP-1 and MASP-3 mRNA up-regulation was found, with a behavior similar to that showed by the fibrillary acidic protein (GFAP). Furthermore, in cell conditioned media, rIL-6 stimulated MASP-3 secretion which reached levels similar to those obtained by dbcAMP treatment. Moreover, the detection of a 46-kDa MASP-3 suggested its processing to the mature form in the extracellular cell medium. Interestingly, the H89 PKA inhibitor, mostly affected dbcAMP-induced MASP-1 and MASP-3 mRNA levels, compared to that of rIL-6, suggesting that cAMP/PKA pathway contributes to MASP-1 and MASP-3 up-regulation. MASP-1 and MASP-3 expression increase was concomitant with dbcAMP- or rIL-6-induced phosphorylation of STAT3. Our findings suggest that the increase in intracellular cAMP concentration or rIL-6 stimulation can play a role in innate immunity enhancing MASP-1 and MASP-3 expression level in C6 glioma cells.
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22
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Jenny L, Dobó J, Gál P, Pál G, Lam WA, Schroeder V. MASP-1 of the complement system enhances clot formation in a microvascular whole blood flow model. PLoS One 2018; 13:e0191292. [PMID: 29324883 PMCID: PMC5764403 DOI: 10.1371/journal.pone.0191292] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Accepted: 01/02/2018] [Indexed: 12/04/2022] Open
Abstract
The complement and coagulation systems closely interact with each other. These interactions are believed to contribute to the proinflammatory and prothrombotic environment involved in the development of thrombotic complications in many diseases. Complement MASP-1 (mannan-binding lectin-associated serine protease-1) activates coagulation factors and promotes clot formation. However, this was mainly shown in purified or plasma-based static systems. Here we describe the role of MASP-1 and complement activation in fibrin clot formation in a microvascular, whole blood flow model. This microfluidic system simulates blood flow through microvessels at physiological flow and shear rates and represents the closest model system to human physiology so far. It features parallel microchannels cultured with endothelial cells in a transparent microfluidic chip allowing real-time evaluation of clot formation by confocal microscopy. To test their effects on clot formation, we added the following activators or inhibitors (individually or in combination) to whole blood and performed perfusion experiments: rMASP-1cf (recombinant active form of MASP-1), complement activator zymosan, selective MASP-1 inhibitor SGMI-1 (based on the Schistocerca gregaria protease inhibitor scaffold), classical pathway inhibitor rSALO (recombinant salivary anti-complement from Lutzomyia longipalpis). Addition of rMASP-1cf resulted in accelerated fibrin clot formation while addition of SGMI-1 delayed it. Complement activation by zymosan led to increased clot formation and this effect was partially reversed by addition of rSALO and almost abolished in combination with SGMI-1. We show for the first time a strong influence of MASP-1, complement activation and pathway-specific inhibition on coagulation in a microvascular flow system that is closest to human physiology, further underpinning the in vivo relevance of coagulation and complement interactions.
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Affiliation(s)
- Lorenz Jenny
- Experimental Haemostasis Group, Department for BioMedical Research, University of Bern, Bern, Switzerland
| | - József Dobó
- Institute of Enzymology, Biological Research Center, Hungarian Academy of Sciences, Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Biological Research Center, Hungarian Academy of Sciences, Budapest, Hungary
| | - Gábor Pál
- Department of Biochemistry, Eötvös Loránd University, Budapest, Hungary
| | - Wilbur A. Lam
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
| | - Verena Schroeder
- Experimental Haemostasis Group, Department for BioMedical Research, University of Bern, Bern, Switzerland
- * E-mail:
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23
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Oroszlán G, Dani R, Szilágyi A, Závodszky P, Thiel S, Gál P, Dobó J. Extensive Basal Level Activation of Complement Mannose-Binding Lectin-Associated Serine Protease-3: Kinetic Modeling of Lectin Pathway Activation Provides Possible Mechanism. Front Immunol 2017; 8:1821. [PMID: 29326707 PMCID: PMC5741598 DOI: 10.3389/fimmu.2017.01821] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 12/04/2017] [Indexed: 12/01/2022] Open
Abstract
Serine proteases (SPs) are typically synthesized as precursors, termed proenzymes or zymogens, and the fully active form is produced via limited proteolysis by another protease or by autoactivation. The lectin pathway of the complement system is initiated by mannose-binding lectin (MBL)-associated SPs (MASP)-1, and MASP-2, which are known to be present as proenzymes in blood. The third SP of the lectin pathway, MASP-3, was recently shown to be the major activator, and the exclusive “resting blood” activator of profactor D, producing factor D, the initiator protease of the alternative pathway. Because only activated MASP-3 is capable of carrying out this cleavage, it was presumed that a significant fraction of MASP-3 must be present in the active form in resting blood. Here, we aimed to detect active MASP-3 in the blood by a more direct technique and to quantitate the active to zymogen ratio. First, MASPs were partially purified (enriched) from human plasma samples by affinity chromatography using immobilized MBL in the presence of inhibitors. Using this MASP pool, only the zymogen form of MASP-1 was detected by Western blot, whereas over 70% MASP-3 was in an activated form in the same samples. Furthermore, the active to zymogen ratio of MASP-3 showed little individual variation. It is enigmatic how MASP-3, which is not able to autoactivate, is present mostly as an active enzyme, whereas MASP-1, which has a potent autoactivation capability, is predominantly proenzymic in resting blood. In an attempt to explain this phenomenon, we modeled the basal level fluid-phase activation of lectin pathway proteases and their subsequent inactivation by C1 inhibitor and antithrombin using available and newly determined kinetic constants. The model can explain extensive MASP-3 activation only if we assume efficient intracomplex activation of MASP-3 by zymogen MASP-1. On the other hand, the model is in good agreement with the fact that MASP-1 and -2 are predominantly proenzymic and some of them is present in the form of inactive serpin–protease complexes. As an alternative hypothesis, MASP-3 activation by proprotein convertases is also discussed.
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Affiliation(s)
- Gábor Oroszlán
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Ráhel Dani
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - András Szilágyi
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Péter Závodszky
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Steffen Thiel
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
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24
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Pihl R, Jensen L, Hansen AG, Thøgersen IB, Andres S, Dagnæs-Hansen F, Oexle K, Enghild JJ, Thiel S. Analysis of Factor D Isoforms in Malpuech-Michels-Mingarelli-Carnevale Patients Highlights the Role of MASP-3 as a Maturase in the Alternative Pathway of Complement. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2017; 199:ji1700518. [PMID: 28794230 DOI: 10.4049/jimmunol.1700518] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 07/10/2017] [Indexed: 11/19/2022]
Abstract
Factor D (FD), which is also known as adipsin, is regarded as the first-acting protease of the alternative pathway (AP) of complement. It has been suggested that FD is secreted as a mature enzyme that does not require subsequent activation. This view was challenged when it was shown that mice lacking mannose-binding lectin (MBL)-associated serine protease-1 (MASP-1) and MASP-3 contain zymogenic FD (pro-FD), and it is becoming evident that MASP-3 is implicated in pro-FD maturation. However, the necessity of MASP-3 for pro-FD cleavage has been questioned, because AP activity is still observed in sera from MASP-1/3-deficient Malpuech-Michels-Mingarelli-Carnevale (3MC) patients. The identification of a novel 3MC patient carrying a previously unidentified MASP-3 G665S mutation prompted us to develop an analytical isoelectric focusing technique that resolves endogenous FD variants in complex samples. This enabled us to show that although 3MC patients predominantly contain pro-FD, they also contain detectable levels of mature FD. Moreover, using isoelectric focusing analysis, we show that both pro-FD and FD are present in the circulation of healthy donors. We characterized the naturally occurring 3MC-associated MASP-3 mutants and found that they all yielded enzymatically inactive proteins. Using MASP-3-depleted human serum, serum from 3MC patients, and Masp1/3-/- mice, we found that lack of enzymatically active MASP-3, or complete MASP-3 deficiency, compromises the conversion of pro-FD to FD. In summary, our observations emphasize that MASP-3 acts as an important maturase in the AP of complement, while also highlighting that there exists MASP-3-independent pro-FD maturation in 3MC patients.
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Affiliation(s)
- Rasmus Pihl
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark;
| | - Lisbeth Jensen
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark
| | - Annette G Hansen
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark
| | - Ida B Thøgersen
- Department of Molecular Biology and Genetics, Aarhus University, DK-8000 Aarhus, Denmark
| | - Stephanie Andres
- Institute of Human Genetics, Technical University Munich, D-81675 München, Germany; and
| | | | - Konrad Oexle
- Institute of Neurogenomics, Helmholtz Zentrum Munich, D-85764 Neuherberg, Germany
| | - Jan J Enghild
- Department of Molecular Biology and Genetics, Aarhus University, DK-8000 Aarhus, Denmark
| | - Steffen Thiel
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus, Denmark
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25
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Schatz-Jakobsen JA, Pedersen DV, Andersen GR. Structural insight into proteolytic activation and regulation of the complement system. Immunol Rev 2017; 274:59-73. [PMID: 27782336 DOI: 10.1111/imr.12465] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The complement system is a highly complex and carefully regulated proteolytic cascade activated through three different pathways depending on the activator recognized. The structural knowledge regarding the intricate proteolytic enzymes that activate and control complement has increased dramatically over the last decade. This development has been pivotal for understanding how mutations within complement proteins might contribute to pathogenesis and has spurred new strategies for development of complement therapeutics. Here we describe and discuss the complement system from a structural perspective and integrate the most recent findings obtained by crystallography, small-angle X-ray scattering, and electron microscopy. In particular, we focus on the proteolytic enzymes governing activation and their products carrying the biological effector functions. Additionally, we present the structural basis for some of the best known complement inhibitors. The large number of accumulated molecular structures enables us to visualize the relative size, position, and overall orientation of many of the most interesting complement proteins and assembled complexes on activator surfaces and in membranes.
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Affiliation(s)
| | - Dennis V Pedersen
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Gregers R Andersen
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.
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26
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Dobó J, Pál G, Cervenak L, Gál P. The emerging roles of mannose-binding lectin-associated serine proteases (MASPs) in the lectin pathway of complement and beyond. Immunol Rev 2017; 274:98-111. [PMID: 27782318 DOI: 10.1111/imr.12460] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Mannose-binding lectin (MBL)-associated serine proteases (MASPs) are the enzymatic constituents of the lectin pathway of the complement system. They are complexed with large pattern recognition molecules (PRMs) such as MBL, other collectins, and ficolins. The main function of two of the three MASPs has crystallized lately: MASP-1 autoactivates first, then it activates MASP-2, and finally both participate in the formation of the C4b2a convertase. In addition to this, both enzymes are involved in several other processes which are subject to intense research nowadays. Notably, MASP-1, as a promiscuous enzyme, has been implicated in the coagulation cascade, in the kinin generating contact system, and in cellular activation through protease-activated receptor (PAR) cleavage on endothelial cells. The third protease MASP-3 has emerged recently as the protease responsible for pro-factor D activation in resting blood, providing a fundamental link between two complement pathways. At present all three MASPs have at least one well-defined role and several other possible functions were implicated. Defect or more likely over-activation of MASPs may culminate into diseases such as ischemia-reperfusion injury (IRI); hence, MASPs are all potential targets of drug development.
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Affiliation(s)
- József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Gábor Pál
- Department of Biochemistry, Eötvös Loránd University, Budapest, Hungary
| | - László Cervenak
- 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary.
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27
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Recent progress in the understanding of complement activation and its role in tumor growth and anti-tumor therapy. Biomed Pharmacother 2017; 91:446-456. [DOI: 10.1016/j.biopha.2017.04.101] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 04/18/2017] [Accepted: 04/23/2017] [Indexed: 02/07/2023] Open
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28
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Chakraborti S, Dhalla NS, Catarino SJ, Messias-Reason IJ. Serine Proteases in the Lectin Pathway of the Complement System. PROTEASES IN PHYSIOLOGY AND PATHOLOGY 2017. [PMCID: PMC7120406 DOI: 10.1007/978-981-10-2513-6_18] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The complement system plays a crucial role in host defense against pathogen infections and in the recognition and removal of damaged or altered self-components. Complement system activation can be initiated by three different pathways—classical, alternative, and lectin pathways—resulting in a proteolytic cascade, which culminates in multiple biological processes including opsonization and phagocytosis of intruders, inflammation, cell lysis, and removal of immune complexes and apoptotic cells. Furthermore, it also functions as a link between the innate and adaptive immune responses. The lectin pathway (LP) activation is mediated by serine proteases, termed mannan-binding lectin (MBL)-associated serine proteases (MASPs), which are associated with the pattern recognition molecules (PRMs) that recognize carbohydrates or acetylated compounds on surfaces of pathogens or apoptotic cells. These result in the proteolysis of complement C2 and C4 generating C3 convertase (C4b2a), which carries forward the activation cascade of complements, culminating in the elimination of foreign molecules. This chapter presents an overview of the complement system focusing on the characterization of MASPs and its genes, as well as its functions in the immune response.
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Affiliation(s)
- Sajal Chakraborti
- Department of Biochemistry and Biophysics, University of Kalyani, Kalyani, West Bengal India
| | - Naranjan S. Dhalla
- St. Boniface Hospital Research Centre, University of Manitoba, Faculty of Health Sciences, College of Medicine, Institute of Cardiovascular Sciences, Manitoba, Winnipeg, Canada
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29
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Kjaer TR, Jensen L, Hansen A, Dani R, Jensenius JC, Dobó J, Gál P, Thiel S. Oligomerization of Mannan-binding Lectin Dictates Binding Properties and Complement Activation. Scand J Immunol 2017; 84:12-9. [PMID: 27104295 DOI: 10.1111/sji.12441] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 04/13/2016] [Indexed: 01/13/2023]
Abstract
The complement system is a part of the innate immune system and is involved in recognition and clearance of pathogens and altered-self structures. The lectin pathway of the complement system is initiated when soluble pattern recognition molecules (PRMs) with collagen-like regions bind to foreign or altered self-surfaces. Associated with the collagen-like stems of these PRMs are three mannan-binding lectin (MBL)-associated serine proteases (MASPs) and two MBL-associated proteins (MAps). The most studied of the PRMs, MBL, is present in serum mainly as trimeric and tetrameric oligomers of the structural subunit. We hypothesized that oligomerization of MBL may influence both the potential to bind to micro organisms and the interaction with the MASPs and MAps, thus influencing the ability to initiate complement activation. When testing binding at 37 °C, we found higher binding of tetrameric MBL to Staphylococcus aureus (S. aureus) than trimeric and dimeric MBL. In serum, we found that tetrameric MBL was the main oligomeric form present in complexes with the MASPs and MAp44. Such preference was confirmed using purified forms of recombinant MBL (rMBL) oligomers, where tetrameric rMBL interacted stronger with all of the MASPs and MAp44, compared to trimeric MBL. As a direct consequence of the weaker interaction with the MASPs, we found that trimeric rMBL was inferior to tetrameric rMBL in activating the complement system. Our data suggest that the oligomeric state of MBL is crucial both for the binding properties and the effector function of MBL.
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Affiliation(s)
- T R Kjaer
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - L Jensen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - A Hansen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - R Dani
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - J C Jensenius
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - J Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - P Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - S Thiel
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
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30
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Li MF, Li J, Sun L. CsMAP34, a teleost MAP with dual role: A promoter of MASP-assisted complement activation and a regulator of immune cell activity. Sci Rep 2016; 6:39287. [PMID: 28008939 PMCID: PMC5180248 DOI: 10.1038/srep39287] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Accepted: 11/22/2016] [Indexed: 01/28/2023] Open
Abstract
In teleost fish, the immune functions of mannan-binding lectin (MBL) associated protein (MAP) and MBL associated serine protease (MASP) are scarcely investigated. In the present study, we examined the biological properties both MAP (CsMAP34) and MASP (CsMASP1) molecules from tongue sole (Cynoglossus semilaevis). We found that CsMAP34 and CsMASP1 expressions occurred in nine different tissues and were upregulated by bacterial challenge. CsMAP34 protein was detected in blood, especially during bacterial infection. Recombinant CsMAP34 (rCsMAP34) bound C. semilaevis MBL (rCsBML) when the latter was activated by bacteria, while recombinant CsMASP1 (rCsMASP1) bound activated rCsBML only in the presence of rCsMAP34. rCsMAP34 stimulated the hemolytic and bactericidal activities of serum complement, whereas anti-CsMAP34 antibody blocked complement activities. Knockdown of CsMASP1 in C. semilaevis resulted in significant inhibition of complement activities. Furthermore, rCsMAP34 interacted directly with peripheral blood leukocytes (PBL) and enhanced the respiratory burst, acid phosphatase activity, chemotactic activity, and gene expression of PBL. These results indicate for the first time that a teleost MAP acts one hand as a regulator that promotes the lectin pathway of complement activation via its ability to recruit MBL to MASP, and other hand as a modulator of immune cell activity.
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Affiliation(s)
- Mo-Fei Li
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China.,Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Jun Li
- School of Biological Sciences, Lake Superior State University, Sault Ste Marie, MI, USA
| | - Li Sun
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China.,Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
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31
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Kim HJ, Ahn SJ, Woo SJ, Hong HK, Suh EJ, Ahn J, Park JH, Ryoo NK, Lee JE, Kim KW, Park KH, Lee C. Proteomics-based identification and validation of novel plasma biomarkers phospholipid transfer protein and mannan-binding lectin serine protease-1 in age-related macular degeneration. Sci Rep 2016; 6:32548. [PMID: 27605007 PMCID: PMC5015054 DOI: 10.1038/srep32548] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 08/09/2016] [Indexed: 11/12/2022] Open
Abstract
Age-related macular degeneration (AMD) is a major cause of severe, progressive visual loss among the elderly. There are currently no established serological markers for the diagnosis of AMD. In this study, we carried out a large-scale quantitative proteomics analysis to identify plasma proteins that could serve as potential AMD biomarkers. We found that the plasma levels of phospholipid transfer protein (PLTP) and mannan-binding lectin serine protease (MASP)-1 were increased in AMD patients relative to controls. The receiver operating characteristic curve based on data from an independent set of AMD patients and healthy controls had an area under the curve of 0.936 for PLTP and 0.716 for MASP-1, revealing excellent discrimination between the two groups. A proteogenomic combination model that incorporated PLTP and MASP-1 along with two known risk genotypes of age-related maculopathy susceptibility 2 and complement factor H genes further enhanced discriminatory power. Additionally, PLTP and MASP-1 mRNA and protein expression levels were upregulated in retinal pigment epithelial cells upon exposure to oxidative stress in vitro. These results indicate that PLTP and MASP-1 can serve as plasma biomarkers for the early diagnosis and treatment of AMD, which is critical for preventing AMD-related blindness.
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Affiliation(s)
- Hye-Jung Kim
- Center for Theragnosis, Korea Institute of Science and Technology, Seoul, Korea
| | - Seong Joon Ahn
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.,Department of Ophthalmology, Hanyang University College of Medicine, Hanyang University Hospital, Seoul, Korea
| | - Se Joon Woo
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Hye Kyoung Hong
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Eui Jin Suh
- Center for Theragnosis, Korea Institute of Science and Technology, Seoul, Korea
| | - Jeeyun Ahn
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.,Department of Ophthalmology, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea
| | - Ji Hyun Park
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Na-Kyung Ryoo
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Ji Eun Lee
- Center for Theragnosis, Korea Institute of Science and Technology, Seoul, Korea
| | - Ki Woong Kim
- Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea.,Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea.,Department of Brain and Cognitive Science, Seoul National University College of Natural Sciences, Seoul, Korea
| | - Kyu Hyung Park
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Cheolju Lee
- Center for Theragnosis, Korea Institute of Science and Technology, Seoul, Korea
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32
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MASP-3 is the exclusive pro-factor D activator in resting blood: the lectin and the alternative complement pathways are fundamentally linked. Sci Rep 2016; 6:31877. [PMID: 27535802 PMCID: PMC4989169 DOI: 10.1038/srep31877] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 07/29/2016] [Indexed: 11/08/2022] Open
Abstract
MASP-3 was discovered 15 years ago as the third mannan-binding lectin (MBL)-associated serine protease of the complement lectin pathway. Lacking any verified substrate its role remained ambiguous. MASP-3 was shown to compete with a key lectin pathway enzyme MASP-2 for MBL binding, and was therefore considered to be a negative complement regulator. Later, knock-out mice experiments suggested that MASP-1 and/or MASP-3 play important roles in complement pro-factor D (pro-FD) maturation. However, studies on a MASP-1/MASP-3-deficient human patient produced contradicting results. In normal resting blood unperturbed by ongoing coagulation or complement activation, factor D is present predominantly in its active form, suggesting that resting blood contains at least one pro-FD activating proteinase that is not a direct initiator of coagulation or complement activation. We have recently showed that all three MASPs can activate pro-FD in vitro. In resting blood, however, using our previously evolved MASP-1 and MASP-2 inhibitors we proved that neither MASP-1 nor MASP-2 activates pro-FD. Other plasma proteinases, particularly MASP-3, remained candidates for that function. For this study we evolved a specific MASP-3 inhibitor and unambiguously proved that activated MASP-3 is the exclusive pro-FD activator in resting blood, which demonstrates a fundamental link between the lectin and alternative pathways.
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Choteau L, Vasseur F, Lepretre F, Figeac M, Gower-Rousseau C, Dubuquoy L, Poulain D, Colombel JF, Sendid B, Jawhara S. Polymorphisms in the Mannose-Binding Lectin Gene are Associated with Defective Mannose-Binding Lectin Functional Activity in Crohn's Disease Patients. Sci Rep 2016; 6:29636. [PMID: 27404661 PMCID: PMC4940739 DOI: 10.1038/srep29636] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 06/22/2016] [Indexed: 02/07/2023] Open
Abstract
Mannose-binding lectin, together with mannose-associated serine proteases, activates the lectin pathway of the complement system and subsequent inflammatory mechanisms. An association between mannose-binding lectin deficiency and anti-Saccharomyces cerevisiae antibody levels is observed in Crohn’s disease and this deficiency is frequently associated with a severe Crohn’s disease phenotype. In the present study, we assessed the relationship between serum concentrations of mannose-binding lectin, mannose-binding lectin functional activity, MBL2 and NOD2 polymorphisms, anti-S. cerevisiae antibody levels and clinical Crohn’s disease phenotype in 69 Crohn’s disease patients and 30 age- and sex-matched healthy controls. The results show that the MBL2 variant rs5030737 at codon 52 was associated with a low level of mannose-binding lectin and impaired mannose-binding lectin–mannose-associated serine protease (MBL-MASP) functional activity in Crohn’s disease patients. This MBL2 variant was also associated with a higher level of anti-S. cerevisiae antibodies. In addition, the NOD2 variant rs2066844, which is associated with susceptibility to Crohn’s disease, was significantly correlated with an impairment in MBL-MASP functional activity. These results provide evidence that Crohn’s disease patients have an impairment in MBL-MASP functional activity and that this defect is associated with MBL2 and NOD2 variants.
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Affiliation(s)
- Laura Choteau
- INSERM, U995, F-59000 Lille, France.,University Lille2, U995-LIRIC, Lille Inflammation Research International Centre, F-59000 Lille, France.,CHU Lille, Service de Parasitologie Mycologie, Pôle de Biologie Pathologie Génétique, F-59000 Lille, France
| | - Francis Vasseur
- Université Lille Nord de France, Unité de Biostatistique, EA 2694, F-59000 Lille, France
| | | | | | - Corine Gower-Rousseau
- INSERM, U995, F-59000 Lille, France.,University Lille2, U995-LIRIC, Lille Inflammation Research International Centre, F-59000 Lille, France
| | - Laurent Dubuquoy
- INSERM, U995, F-59000 Lille, France.,University Lille2, U995-LIRIC, Lille Inflammation Research International Centre, F-59000 Lille, France
| | - Daniel Poulain
- INSERM, U995, F-59000 Lille, France.,University Lille2, U995-LIRIC, Lille Inflammation Research International Centre, F-59000 Lille, France.,CHU Lille, Service de Parasitologie Mycologie, Pôle de Biologie Pathologie Génétique, F-59000 Lille, France
| | - Jean-Frederic Colombel
- Department of Gastroenterology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Boualem Sendid
- INSERM, U995, F-59000 Lille, France.,University Lille2, U995-LIRIC, Lille Inflammation Research International Centre, F-59000 Lille, France.,CHU Lille, Service de Parasitologie Mycologie, Pôle de Biologie Pathologie Génétique, F-59000 Lille, France
| | - Samir Jawhara
- INSERM, U995, F-59000 Lille, France.,University Lille2, U995-LIRIC, Lille Inflammation Research International Centre, F-59000 Lille, France.,CHU Lille, Service de Parasitologie Mycologie, Pôle de Biologie Pathologie Génétique, F-59000 Lille, France
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Complement MASP-1 enhances adhesion between endothelial cells and neutrophils by up-regulating E-selectin expression. Mol Immunol 2016; 75:38-47. [PMID: 27219453 DOI: 10.1016/j.molimm.2016.05.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 05/05/2016] [Accepted: 05/07/2016] [Indexed: 12/31/2022]
Abstract
The complement system and neutrophil granulocytes are indispensable in the immune response against extracellular pathogens such as bacteria and fungi. Endothelial cells also participate in antimicrobial immunity largely by regulating the homing of leukocytes through their cytokine production and their pattern of cell surface adhesion molecules. We have previously shown that mannan-binding lectin-associated serine protease-1 (MASP-1), a complement lectin pathway enzyme, is able to activate endothelial cells by cleaving protease activated receptors, which leads to cytokine production and enables neutrophil chemotaxis. Therefore, we aimed to investigate how recombinant MASP-1 (rMASP-1) can modify the pattern of P-selectin, E-selectin, ICAM-1, ICAM-2, and VCAM-1 adhesion molecules in human umbilical vein endothelial cells (HUVEC), and whether these changes can enhance the adherence between endothelial cells and neutrophil granulocyte model cells (differentiated PLB-985). We found that HUVECs activated by rMASP-1 decreased the expression of ICAM-2 and increased that of E-selectin, whereas ICAM-1, VCAM-1 and P-selectin expression remained unchanged. Furthermore, these changes resulted in increased adherence between differentiated PLB-985 cells and endothelial cells. Our finding suggests that complement MASP-1 can increase adhesion between neutrophils and endothelial cells in a direct fashion. This is in agreement with our previous finding that MASP-1 increases the production of pro-inflammatory cytokines (such as IL-6 and IL-8) and chemotaxis, and may thereby boost neutrophil functions. This newly described cooperation between complement lectin pathway and neutrophils via endothelial cells may be an effective tool to enhance the antimicrobial immune response.
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Oroszlán G, Kortvely E, Szakács D, Kocsis A, Dammeier S, Zeck A, Ueffing M, Závodszky P, Pál G, Gál P, Dobó J. MASP-1 and MASP-2 Do Not Activate Pro-Factor D in Resting Human Blood, whereas MASP-3 Is a Potential Activator: Kinetic Analysis Involving Specific MASP-1 and MASP-2 Inhibitors. THE JOURNAL OF IMMUNOLOGY 2015; 196:857-65. [PMID: 26673137 DOI: 10.4049/jimmunol.1501717] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Accepted: 11/16/2015] [Indexed: 12/16/2022]
Abstract
It had been thought that complement factor D (FD) is activated at the site of synthesis, and only FD lacking a propeptide is present in blood. The serum of mannose-binding lectin-associated serine protease (MASP)-1/3(-/-) mice contains pro-FD and has markedly reduced alternative pathway activity. It was suggested that MASP-1 and MASP-3 directly activate pro-FD; however, other experiments contradicted this view. We decided to clarify the involvement of MASPs in pro-FD activation in normal, as opposed to deficient, human plasma and serum. Human pro-FD containing an APPRGR propeptide was produced in insect cells. We measured its activation kinetics using purified active MASP-1, MASP-2, MASP-3, as well as thrombin. We found all these enzymes to be efficient activators, whereas MASP proenzymes lacked such activity. Pro-FD cleavage in serum or plasma was quantified by a novel assay using fluorescently labeled pro-FD. Labeled pro-FD was processed with t1/2s of ∼ 3 and 5 h in serum and plasma, respectively, showing that proteolytic activity capable of activating pro-FD exists in blood even in the absence of active coagulation enzymes. Our previously developed selective MASP-1 and MASP-2 inhibitors did not reduce pro-FD activation at reasonable concentration. In contrast, at very high concentration, the MASP-2 inhibitor, which is also a poor MASP-3 inhibitor, slowed down the activation. When recombinant MASPs were added to plasma, only MASP-3 could reduce the half-life of pro-FD. Combining our quantitative data, MASP-1 and MASP-2 can be ruled out as direct pro-FD activators in resting blood; however, active MASP-3 is a very likely physiological activator.
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Affiliation(s)
- Gábor Oroszlán
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1117 Budapest, Hungary
| | - Elod Kortvely
- Institute for Ophthalmic Research, University of Tübingen, 72076 Tübingen, Germany
| | - Dávid Szakács
- Department of Biochemistry, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Andrea Kocsis
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1117 Budapest, Hungary
| | - Sascha Dammeier
- Institute for Ophthalmic Research, Medical Proteome Center, University of Tübingen, 72074 Tübingen, Germany; and
| | - Anne Zeck
- Natural and Medical Sciences Institute at the University of Tübingen, Department of Bioanalytics, 72770 Reutlingen, Germany
| | - Marius Ueffing
- Institute for Ophthalmic Research, University of Tübingen, 72076 Tübingen, Germany; Institute for Ophthalmic Research, Medical Proteome Center, University of Tübingen, 72074 Tübingen, Germany; and
| | - Péter Závodszky
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1117 Budapest, Hungary
| | - Gábor Pál
- Department of Biochemistry, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1117 Budapest, Hungary;
| | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1117 Budapest, Hungary;
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Jenny L, Dobó J, Gál P, Schroeder V. MASP-1 Induced Clotting--The First Model of Prothrombin Activation by MASP-1. PLoS One 2015; 10:e0144633. [PMID: 26645987 PMCID: PMC4672900 DOI: 10.1371/journal.pone.0144633] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 11/21/2015] [Indexed: 01/24/2023] Open
Abstract
Mannan-binding lectin-associated serine protease-1 (MASP-1), a protein of the complement lectin pathway, resembles thrombin in terms of structural features and substrate specificity. Due to its interplay with several coagulation factors, it has the ability to induce fibrin clot formation independent of the usual coagulation activation pathways. We have recently shown that MASP-1 activates prothrombin and identified arginine (R) 155, R271, and R393 as potential cleavage sites. FXa cleaves R320 instead of R393, and thrombin cleaves R155 and R284 in prothrombin. Here we have used three arginine-to-glutamine mutants of prothrombin, R271Q, R320Q, R393Q and the serine-to-alanine active site mutant S525A to investigate in detail the mechanism of MASP-1 mediated prothrombin activation. Prothrombin wildtype and mutants were digested with MASP-1 and the cleavage products were analysed by SDS-PAGE and N-terminal sequencing. A functional clotting assay was performed by thrombelastography. We have found that MASP-1 activates prothrombin via two simultaneous pathways, either cleaving at R271 or R393 first. Both pathways result in the formation of several active alternative thrombin species. Functional studies confirmed that both R393 and R320 are required for prothrombin activation by MASP-1, whereas R155 is not considered to be an important cleavage site in this process. In conclusion, we have described for the first time a detailed model of prothrombin activation by MASP-1.
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Affiliation(s)
- Lorenz Jenny
- University Clinic of Haematology, Haemostasis Research Laboratory, University Hospital Bern, Bern, Switzerland
- Department of Clinical Research, University of Bern, Bern, Switzerland
| | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Verena Schroeder
- University Clinic of Haematology, Haemostasis Research Laboratory, University Hospital Bern, Bern, Switzerland
- Department of Clinical Research, University of Bern, Bern, Switzerland
- * E-mail:
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Merle NS, Church SE, Fremeaux-Bacchi V, Roumenina LT. Complement System Part I - Molecular Mechanisms of Activation and Regulation. Front Immunol 2015; 6:262. [PMID: 26082779 PMCID: PMC4451739 DOI: 10.3389/fimmu.2015.00262] [Citation(s) in RCA: 1019] [Impact Index Per Article: 113.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 05/11/2015] [Indexed: 12/12/2022] Open
Abstract
Complement is a complex innate immune surveillance system, playing a key role in defense against pathogens and in host homeostasis. The complement system is initiated by conformational changes in recognition molecular complexes upon sensing danger signals. The subsequent cascade of enzymatic reactions is tightly regulated to assure that complement is activated only at specific locations requiring defense against pathogens, thus avoiding host tissue damage. Here, we discuss the recent advances describing the molecular and structural basis of activation and regulation of the complement pathways and their implication on physiology and pathology. This article will review the mechanisms of activation of alternative, classical, and lectin pathways, the formation of C3 and C5 convertases, the action of anaphylatoxins, and the membrane-attack-complex. We will also discuss the importance of structure-function relationships using the example of atypical hemolytic uremic syndrome. Lastly, we will discuss the development and benefits of therapies using complement inhibitors.
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Affiliation(s)
- Nicolas S Merle
- UMR_S 1138, Cordeliers Research Center, Complement and Diseases Team, INSERM , Paris , France ; UMR_S 1138, Centre de Recherche des Cordeliers, Sorbonne Paris Cité, Université Paris Descartes , Paris , France ; UMR_S 1138, Centre de Recherche des Cordeliers, Sorbonne Universités, Université Pierre et Marie Curie-Paris , Paris , France
| | - Sarah Elizabeth Church
- UMR_S 1138, Centre de Recherche des Cordeliers, Sorbonne Paris Cité, Université Paris Descartes , Paris , France ; UMR_S 1138, Centre de Recherche des Cordeliers, Sorbonne Universités, Université Pierre et Marie Curie-Paris , Paris , France ; UMR_S 1138, Cordeliers Research Center, Integrative Cancer Immunology Team, INSERM , Paris , France
| | - Veronique Fremeaux-Bacchi
- UMR_S 1138, Cordeliers Research Center, Complement and Diseases Team, INSERM , Paris , France ; UMR_S 1138, Centre de Recherche des Cordeliers, Sorbonne Paris Cité, Université Paris Descartes , Paris , France ; UMR_S 1138, Centre de Recherche des Cordeliers, Sorbonne Universités, Université Pierre et Marie Curie-Paris , Paris , France ; Service d'Immunologie Biologique, Assistance Publique-Hôpitaux de Paris, Hôpital Européen Georges-Pompidou , Paris , France
| | - Lubka T Roumenina
- UMR_S 1138, Cordeliers Research Center, Complement and Diseases Team, INSERM , Paris , France ; UMR_S 1138, Centre de Recherche des Cordeliers, Sorbonne Paris Cité, Université Paris Descartes , Paris , France ; UMR_S 1138, Centre de Recherche des Cordeliers, Sorbonne Universités, Université Pierre et Marie Curie-Paris , Paris , France
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Beltrame MH, Boldt ABW, Catarino SJ, Mendes HC, Boschmann SE, Goeldner I, Messias-Reason I. MBL-associated serine proteases (MASPs) and infectious diseases. Mol Immunol 2015; 67:85-100. [PMID: 25862418 PMCID: PMC7112674 DOI: 10.1016/j.molimm.2015.03.245] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 03/11/2015] [Accepted: 03/12/2015] [Indexed: 12/16/2022]
Abstract
MASP-1 and MASP-2 are central players of the lectin pathway of complement. MASP1 and MASP2 gene polymorphisms regulate protein serum levels and activity. MASP deficiencies are associated with increased infection susceptibility. MASP polymorphisms and serum levels are associated with disease progression.
The lectin pathway of the complement system has a pivotal role in the defense against infectious organisms. After binding of mannan-binding lectin (MBL), ficolins or collectin 11 to carbohydrates or acetylated residues on pathogen surfaces, dimers of MBL-associated serine proteases 1 and 2 (MASP-1 and MASP-2) activate a proteolytic cascade, which culminates in the formation of the membrane attack complex and pathogen lysis. Alternative splicing of the pre-mRNA encoding MASP-1 results in two other products, MASP-3 and MAp44, which regulate activation of the cascade. A similar mechanism allows the gene encoding MASP-2 to produce the truncated MAp19 protein. Polymorphisms in MASP1 and MASP2 genes are associated with protein serum levels and functional activity. Since the first report of a MASP deficiency in 2003, deficiencies in lectin pathway proteins have been associated with recurrent infections and several polymorphisms were associated with the susceptibility or protection to infectious diseases. In this review, we summarize the findings on the role of MASP polymorphisms and serum levels in bacterial, viral and protozoan infectious diseases.
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Affiliation(s)
- Marcia H Beltrame
- Department of Clinical Pathology, Hospital de Clínicas, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brazil
| | - Angelica B W Boldt
- Department of Genetics, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Sandra J Catarino
- Department of Clinical Pathology, Hospital de Clínicas, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brazil
| | - Hellen C Mendes
- Department of Clinical Pathology, Hospital de Clínicas, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brazil
| | - Stefanie E Boschmann
- Department of Clinical Pathology, Hospital de Clínicas, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brazil
| | - Isabela Goeldner
- Department of Clinical Pathology, Hospital de Clínicas, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brazil
| | - Iara Messias-Reason
- Department of Clinical Pathology, Hospital de Clínicas, Universidade Federal do Paraná (UFPR), Curitiba, PR, Brazil.
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Jenny L, Dobó J, Gál P, Schroeder V. MASP-1 of the complement system promotes clotting via prothrombin activation. Mol Immunol 2015; 65:398-405. [PMID: 25745807 DOI: 10.1016/j.molimm.2015.02.014] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 02/10/2015] [Accepted: 02/10/2015] [Indexed: 12/13/2022]
Abstract
Mannan-binding lectin-associated serine protease-1 (MASP-1), a protein of the complement lectin pathway, resembles thrombin in terms of structural features and substrate specificity, and it has been shown to activate coagulation factors. Here we studied the effects of MASP-1 on clot formation in whole blood (WB) and platelet-poor plasma (PPP) by thrombelastography and further elucidated the underlying mechanism. Cleavage of prothrombin by MASP-1 was investigated by SDS-PAGE and N-terminal sequencing of cleavage products. Addition of MASP-1 or thrombin to WB and PPP shortened the clotting time and clot formation time significantly compared to recalcified-only samples. The combination of MASP-1 and thrombin had additive effects. In a purified system, MASP-1 was able to induce clotting only in presence of prothrombin. Analysis of MASP-1-digested prothrombin confirmed that MASP-1 cleaves prothrombin at three cleavage sites. In conclusion, we have shown that MASP-1 is able to induce and promote clot formation measured in a global setting using the technique of thrombelastography. We further confirmed that MASP-1-induced clotting is dependent on prothrombin. Finally, we have demonstrated that MASP-1 cleaves prothrombin and identified its cleavage sites, suggesting that MASP-1 gives rise to an alternative active form of thrombin by cleaving at the cleavage site R393.
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Affiliation(s)
- Lorenz Jenny
- University Clinic of Haematology, Haemostasis Research Laboratory, University Hospital Bern, 3010 Bern, Switzerland; Department of Clinical Research, University of Bern, Bern, Switzerland
| | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok krt 2, H-1113 Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok krt 2, H-1113 Budapest, Hungary
| | - Verena Schroeder
- University Clinic of Haematology, Haemostasis Research Laboratory, University Hospital Bern, 3010 Bern, Switzerland; Department of Clinical Research, University of Bern, Bern, Switzerland.
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Human lectins and their roles in viral infections. Molecules 2015; 20:2229-71. [PMID: 25642836 PMCID: PMC6272597 DOI: 10.3390/molecules20022229] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 01/21/2015] [Accepted: 01/23/2015] [Indexed: 12/20/2022] Open
Abstract
Innate recognition of virus proteins is an important component of the immune response to viral pathogens. A component of this immune recognition is the family of lectins; pattern recognition receptors (PRRs) that recognise viral pathogen-associated molecular patterns (PAMPs) including viral glycoproteins. In this review we discuss the contribution of soluble and membrane-associated PRRs to immunity against virus pathogens, and the potential role of these molecules in facilitating virus replication. These processes are illustrated with examples of viruses including human immunodeficiency virus (HIV), hepatitis C virus (HCV) and Ebola virus (EBOV). We focus on the structure, function and genetics of the well-characterised C-type lectin mannose-binding lectin, the ficolins, and the membrane-bound CD209 proteins expressed on dendritic cells. The potential for lectin-based antiviral therapies is also discussed.
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Kjaer TR, Le LTM, Pedersen JS, Sander B, Golas MM, Jensenius JC, Andersen GR, Thiel S. Structural insights into the initiating complex of the lectin pathway of complement activation. Structure 2015; 23:342-51. [PMID: 25579818 DOI: 10.1016/j.str.2014.10.024] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 10/18/2014] [Accepted: 10/21/2014] [Indexed: 10/24/2022]
Abstract
The proteolytic cascade of the complement system is initiated when pattern-recognition molecules (PRMs) bind to ligands, resulting in the activation of associated proteases. In the lectin pathway of complement, the complex of mannan-binding lectin (MBL) and MBL-associated serine protease-1 (MASP-1) initiates the pathway by activating a second protease, MASP-2. Here we present a structural study of a PRM/MASP complex and derive the overall architecture of the 450 kDa MBL/MASP-1 complex using small-angle X-ray scattering and electron microscopy. The serine protease (SP) domains from the zymogen MASP-1 dimer protrude from the cone-like MBL tetramer and are separated by at least 20 nm. This suggests that intracomplex activation within a single MASP-1 dimer is unlikely and instead supports intercomplex activation, whereby the MASP SP domains are accessible to nearby PRM-bound MASPs. This activation mechanism differs fundamentally from the intracomplex initiation models previously proposed for both the lectin and the classical pathway.
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Affiliation(s)
- Troels R Kjaer
- Department of Biomedicine, Aarhus University, Bartholins Allé 6 and Wilhelm Meyers Allé 3, 8000 Aarhus, Denmark
| | - Le T M Le
- Department of Clinical Medicine, Aarhus University, Wilhelm Meyers Allé 3, 8000 Aarhus, Denmark
| | - Jan Skov Pedersen
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus, Denmark; Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus, Denmark
| | - Bjoern Sander
- Department of Clinical Medicine, Aarhus University, Wilhelm Meyers Allé 3, 8000 Aarhus, Denmark; Center for Stochastic Geometry and Advanced Bioimaging (CSGB), Aarhus University, Wilhelm Meyers Allé 3, 8000 Aarhus, Denmark
| | - Monika M Golas
- Department of Biomedicine, Aarhus University, Bartholins Allé 6 and Wilhelm Meyers Allé 3, 8000 Aarhus, Denmark; Center for Stochastic Geometry and Advanced Bioimaging (CSGB), Aarhus University, Wilhelm Meyers Allé 3, 8000 Aarhus, Denmark
| | - Jens Christian Jensenius
- Department of Biomedicine, Aarhus University, Bartholins Allé 6 and Wilhelm Meyers Allé 3, 8000 Aarhus, Denmark
| | - Gregers R Andersen
- Department of Molecular Biology and Genetics, Aarhus University, Gustav Wieds Vej 10, 8000 Aarhus, Denmark
| | - Steffen Thiel
- Department of Biomedicine, Aarhus University, Bartholins Allé 6 and Wilhelm Meyers Allé 3, 8000 Aarhus, Denmark.
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Swierzko AS, Szala A, Sawicki S, Szemraj J, Sniadecki M, Sokolowska A, Kaluzynski A, Wydra D, Cedzynski M. Mannose-Binding Lectin (MBL) and MBL-associated serine protease-2 (MASP-2) in women with malignant and benign ovarian tumours. Cancer Immunol Immunother 2014; 63:1129-40. [PMID: 25038892 PMCID: PMC4209098 DOI: 10.1007/s00262-014-1579-y] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 07/02/2014] [Indexed: 11/28/2022]
Abstract
Mannose-Binding Lectin (MBL) is a serum pattern recognition molecule, able to activate complement in association with MASP proteases. Serum levels of MBL and MASP-2, activities of MBL-MASP complexes, single nucleotide polymorphisms of the MBL2 and MASP2 genes and/or their specific mRNA expression in ovarian sections were investigated in 128 patients suffering from primary ovarian cancer (OC) and compared with 197 controls (C), encompassing both patients with benign ovarian tumours (n = 123) and others with no ovarian pathology (n = 74). MBL deficiency-associated genotypes were more common among OC patients than among controls. The O/O group of genotypes was associated with ovarian cancer (OR 3.5, p = 0.02). In A/A homozygotes, MBL concentrations and activities were elevated in the OC group and correlated with C-reactive protein. Moreover, high MBL serum levels were associated with more advanced disease stage. No differences in distribution of the MASP2 +359 A>G (D120G) SNP or MASP-2 serum levels were found between cancer patients and their controls. However, the highest frequency of the A/G (MASP2) and LXA/O or O/O (MBL2) genotypes was found among OC patients with tumours of G1-2 grade (well/moderately differentiated). Furthermore, MBL deficiency-associated genotypes predicted prolonged survival. None of the parameters investigated correlated with CA125 antigen or patients' age. The local expression of MBL2 and MASP2 genes was higher in women with ovarian cancer compared with controls. It is concluded that the expression of MBL and MASP-2 is altered in ovarian cancer, possibly indicating involvement of the lectin pathway of complement activation in the disease.
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Affiliation(s)
- Anna St Swierzko
- Laboratory of Immunobiology of Infections, Institute of Medical Biology, Polish Academy of Sciences, Lodowa 106, 93-232, Lodz, Poland
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Chen D, Enroth S, Ivansson E, Gyllensten U. Pathway analysis of cervical cancer genome-wide association study highlights the MHC region and pathways involved in response to infection. Hum Mol Genet 2014; 23:6047-60. [PMID: 24934695 DOI: 10.1093/hmg/ddu304] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Cervical cancer is caused by infection with human papillomavirus (HPV). A genome-wide association study (GWAS) has identified several susceptibility loci for cervical cancer, but they explain only a small fraction of cervical cancer heritability. Other variants with weaker effect may be missed due to the stringent significance threshold. To identify important pathways in cervical carcinogenesis, we performed a two-stage pathway analysis in two independent GWASs in the Swedish population, using the single-nucleotide polymorphism (SNP) ratio test. The 565 predefined pathways from Kyoto Encyclopedia of Genes and Genomes and BioCarta databases were systematically evaluated in the discovery stage (1034 cases and 3948 controls with 632,668 SNPs) and the suggestive pathways were further validated in the replication stage (616 cases and 506 controls with 341,358 SNPs). We found 12 pathways that were significant in both stages, and these were further validated using set-based analysis. For 10 of these pathways, the effect was mainly due to genetic variation within the major histocompatibility complex (MHC) region. In addition, we identified a set of novel candidate genes outside the MHC region in the pathways denoted 'Staphylococcus aureus infection' and 'herpes simplex infection' that influenced susceptibility to cervical cancer (empirical P = 4.99 × 10(-5) and 4.99 × 10(-5) in the discovery study; empirical P = 8.98 × 10(-5) and 0.009 in the replication study, respectively). Staphylococcus aureus infection may evoke an inflammatory response that inadvertently enhances malignant progression caused by HPV infection, and Herpes simplex virus-2 infection may act in conjunction with HPV infection to increase the risk of cervical carcinoma development. These findings provide new insights into the etiology of cervical cancer.
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Affiliation(s)
- Dan Chen
- Department of Immunology, Genetics and Pathology, Ministry of Education and Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | | | - Emma Ivansson
- Department of Immunology, Genetics and Pathology, IMBIM, Science for Life Laboratory Uppsala, Uppsala University, Uppsala, Sweden and
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Dobó J, Schroeder V, Jenny L, Cervenak L, Závodszky P, Gál P. Multiple roles of complement MASP-1 at the interface of innate immune response and coagulation. Mol Immunol 2014; 61:69-78. [PMID: 24935208 DOI: 10.1016/j.molimm.2014.05.013] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 05/26/2014] [Accepted: 05/27/2014] [Indexed: 11/24/2022]
Abstract
MASP-1 is a versatile serine protease that cleaves a number of substrates in human blood. In recent years it became evident that besides playing a crucial role in complement activation MASP-1 also triggers other cascade systems and even cells to mount a more powerful innate immune response. In this review we summarize the latest discoveries about the diverse functions of this multi-faceted protease. Recent studies revealed that among MBL-associated serine proteases, MASP-1 is the one responsible for triggering the lectin pathway via its ability to rapidly autoactivate then cleave MASP-2, and possibly MASP-3. The crystal structure of MASP-1 explains its more relaxed substrate specificity compared to the related complement enzymes. Due to the relaxed specificity, MASP-1 interacts with the coagulation cascade and the kinin generating system, and it can also activate endothelial cells eliciting pro-inflammatory signaling.
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Affiliation(s)
- József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok krt. 2, H-1113 Budapest, Hungary
| | - Verena Schroeder
- Department of Clinical Research, University of Bern, and University Clinic of Haematology, University Hospital, Bern, Switzerland
| | - Lorenz Jenny
- Department of Clinical Research, University of Bern, and University Clinic of Haematology, University Hospital, Bern, Switzerland
| | - László Cervenak
- 3rd Department of Internal Medicine, Semmelweis University, Kútvölgyi út 4, H-1125 Budapest, Hungary
| | - Péter Závodszky
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok krt. 2, H-1113 Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok krt. 2, H-1113 Budapest, Hungary.
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Rosbjerg A, Munthe-Fog L, Garred P, Skjoedt MO. Heterocomplex formation between MBL/ficolin/CL-11-associated serine protease-1 and -3 and MBL/ficolin/CL-11-associated protein-1. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2014; 192:4352-60. [PMID: 24683193 DOI: 10.4049/jimmunol.1303263] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
The activity of the complement system is tightly controlled by many fluid-phase and tissue-bound regulators. Mannose-binding lectin (MBL)/ficolin/collectin-11-associated protein-1 (MAP-1) is a recently discovered plasma protein that acts as an upstream inhibitor of the lectin complement pathway (LCP). It has previously been shown that MAP-1 can compete with the MBL/ficolin/collectin-11-associated serine proteases (MASPs) in binding to MBL and the ficolins. However, this mechanism may only partly explain the inhibitory complement effect of MAP-1. We hypothesized that MAP-1 is also involved in heterocomplex formation with the MASPs thereby breaking the stoichiometry of the activation complexes of the LCP, which could represent an alternative mechanism of MAP-1-mediated complement inhibition. We assessed the heterocomplex formation with ELISA, size-exclusion chromatography, and immunoblotting using both recombinant proteins and serum/plasma. We found that rMAP-1 can engage in heterocomplexes with rMASP-1 and rMASP-3 in a calcium-dependent manner. Moreover, we discovered that rMASP-1 and rMASP-3 also form heterocomplexes under these conditions. Complexes containing both MAP-1 and MASP-1 or -3 were detected in normal human serum and plasma, and depletion of the LCP recognition molecules from ficolin-3-deficient human serum showed that free circulating heterocomplexes also exist in the blood, although the major part appears to be associated with the LCP recognition molecules. Altogether, these findings suggest that MASPs can associate in various combinations and bring new perspectives to the complexity of lectin pathway-driven complement activation.
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Affiliation(s)
- Anne Rosbjerg
- Laboratory of Molecular Medicine, Department of Clinical Immunology, Faculty of Health and Medical Sciences, Rigshospitalet, University of Copenhagen, DK 2100 Copenhagen, Denmark
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Paréj K, Hermann A, Donáth N, Závodszky P, Gál P, Dobó J. Dissociation and re-association studies on the interaction domains of mannan-binding lectin (MBL)-associated serine proteases, MASP-1 and MASP-2, provide evidence for heterodimer formation. Mol Immunol 2014; 59:1-9. [PMID: 24424083 DOI: 10.1016/j.molimm.2013.12.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 12/23/2013] [Indexed: 10/25/2022]
Abstract
Activation of the lectin pathway of complement begins with the activation of mannan-binding lectin (MBL)-associated serine proteases, MASP-1 and MASP-2, which are bound to the recognition molecules, MBL and ficolins. MASPs are Ca(2+)-dependent dimers. Dimerization and Ca(2+)-dependent association with the recognition molecules occurs via the first 3 domains, the CUB1-EGF-CUB2 region. The CUB1-EGF-CUB2 (D1-3) regions of MASP-1 and MASP-2, and also their tagged versions, were expressed in E. coli, refolded and purified. The first three domains of MASP-1 are identical with the respective regions of MASP-3 and MAp44, which are also associated with MBL and ficolins. The functionality of the fragments was checked by inhibition of C3 deposition from human serum. Time-course of the dissociation and re-association was examined by size exclusion chromatography. Both refolded proteins are tight Ca(2+)-dependent dimers, as expected. In buffer containing EDTA MASP-1_D1-3 dissociated to monomers, however it took about 1h to reach an equilibrium. Upon re-calcification dimers were re-formed, but this process was even slower; only after overnight incubation was the dimerization completed. MASP-2_D1-3 showed a somewhat different behavior: dissociation by EDTA was even slower, less complete, and higher MW aggregates also appeared. Heterodimer formation was detected by native PAGE. As modeled by the D1-3 fragments, MASP-1 and MASP-2 can readily form heterodimers after dissociation and re-association, however, in the presence of Ca(2+) exchange of subunits is slow between the homodimers. MASP-1:MASP-3 heterodimer formation was modeled by the tagged and untagged D1-3 fragments, and data indicate that subunits of these proteins are readily exchanged even in the presence of Ca(2+). The existence of heterodimers influences the current view on the composition of lectin pathway complexes and their activation.
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Affiliation(s)
- Katalin Paréj
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 29 Karolina Street, H-1113 Budapest, Hungary
| | - Agnes Hermann
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 29 Karolina Street, H-1113 Budapest, Hungary; Faculty of Information Technology, Pázmány Péter Catholic University, 50/A Práter Street, H-1083 Budapest, Hungary
| | - Nóra Donáth
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 29 Karolina Street, H-1113 Budapest, Hungary
| | - Péter Závodszky
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 29 Karolina Street, H-1113 Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 29 Karolina Street, H-1113 Budapest, Hungary.
| | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 29 Karolina Street, H-1113 Budapest, Hungary.
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Pągowska-Klimek I, Cedzyński M. Mannan-binding lectin in cardiovascular disease. BIOMED RESEARCH INTERNATIONAL 2014; 2014:616817. [PMID: 24877121 PMCID: PMC4022110 DOI: 10.1155/2014/616817] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 04/10/2014] [Indexed: 01/19/2023]
Abstract
Cardiovascular disease remains the leading cause of mortality and morbidity worldwide so research continues into underlying mechanisms. Since innate immunity and its potent component mannan-binding lectin have been proven to play an important role in the inflammatory response during infection and ischaemia-reperfusion injury, attention has been paid to its role in the development of cardiovascular complications as well. This review provides a general outline of the structure and genetic polymorphism of MBL and its role in inflammation/tissue injury with emphasis on associations with cardiovascular disease. MBL appears to be involved in the pathogenesis of atherosclerosis and, in consequence, coronary artery disease and also inflammation and tissue injury after myocardial infarction and heart transplantation. The relationship between MBL and disease is rather complex and depends on different genetic and environmental factors. That could be why the data obtained from animal and clinical studies are sometimes contradictory proving not for the first time that innate immunity is a "double-edge sword," sometimes beneficial and, at other times disastrous for the host.
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Affiliation(s)
- Izabela Pągowska-Klimek
- Department of Anesthesiology and Intensive Care, Polish Mother's Memorial Hospital Institute, Rzgowska 281/289, 93-338 Łódź, Poland
| | - Maciej Cedzyński
- Laboratory of Immunobiology of Infections, Institute of Medical Biology, Polish Academy of Sciences, Lodowa 106, 93-232 Łódź, Poland
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Keizer MP, Kamp AM, Brouwer N, van de Wetering MD, Wouters D, Kuijpers TW. Plasma-derived mannose-binding lectin shows a direct interaction with C1-inhibitor. Mol Immunol 2014; 58:187-93. [DOI: 10.1016/j.molimm.2013.11.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 11/26/2013] [Accepted: 11/26/2013] [Indexed: 10/25/2022]
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Jani PK, Kajdácsi E, Megyeri M, Dobó J, Doleschall Z, Futosi K, Tímár CI, Mócsai A, Makó V, Gál P, Cervenak L. MASP-1 induces a unique cytokine pattern in endothelial cells: a novel link between complement system and neutrophil granulocytes. PLoS One 2014; 9:e87104. [PMID: 24489848 PMCID: PMC3906121 DOI: 10.1371/journal.pone.0087104] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Accepted: 12/06/2013] [Indexed: 11/18/2022] Open
Abstract
Microbial infection urges prompt intervention by the immune system. The complement cascade and neutrophil granulocytes are the predominant contributors to this immediate anti-microbial action. We have previously shown that mannan-binding lectin-associated serine protease-1 (MASP-1), the most abundant enzyme of the complement lectin pathway, can induce p38-MAPK activation, NFkappaB signaling, and Ca2+-mobilization in endothelial cells. Since neutrophil chemotaxis and transmigration depends on endothelial cell activation, we aimed to explore whether recombinant MASP-1 (rMASP-1) is able to induce cytokine production and subsequent neutrophil chemotaxis in human umbilical vein endothelial cells (HUVEC). We found that HUVECs activated by rMASP-1 secreted IL-6 and IL-8, but not IL-1alpha, IL-1ra, TNFalpha and MCP-1. rMASP-1 induced dose-dependent IL-6 and IL-8 production with different kinetics. rMASP-1 triggered IL-6 and IL-8 production was regulated predominantly by the p38-MAPK pathway. Moreover, the supernatant of rMASP-1-stimulated HUVECs activated the chemotaxis of neutrophil granulocytes as an integrated effect of cytokine production. Our results implicate that besides initializing the complement lectin pathway, MASP-1 may activate neutrophils indirectly, via the endothelial cells, which link these effective antimicrobial host defense mechanisms.
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Affiliation(s)
- Péter K. Jani
- 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary
- * E-mail:
| | - Erika Kajdácsi
- 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary
| | - Márton Megyeri
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Zoltán Doleschall
- Department of Pathogenetics, National Institute of Oncology, Budapest, Hungary
| | - Krisztina Futosi
- Department of Physiology, Semmelweis University School of Medicine, Budapest, Hungary
| | - Csaba I. Tímár
- Department of Physiology, Semmelweis University School of Medicine, Budapest, Hungary
| | - Attila Mócsai
- Department of Physiology, Semmelweis University School of Medicine, Budapest, Hungary
| | - Veronika Makó
- 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - László Cervenak
- 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary
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50
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Megyeri M, Jani PK, Kajdácsi E, Dobó J, Schwaner E, Major B, Rigó J, Závodszky P, Thiel S, Cervenak L, Gál P. Serum MASP-1 in complex with MBL activates endothelial cells. Mol Immunol 2014; 59:39-45. [PMID: 24472859 DOI: 10.1016/j.molimm.2014.01.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 12/30/2013] [Accepted: 01/02/2014] [Indexed: 11/16/2022]
Abstract
The complement system plays an important role in the induction of inflammation. In this study we demonstrate that the initiation complexes of the lectin pathway, consisting of mannose-binding lectin (MBL) and associated serine proteases (MASPs) elicit Ca(2+) signaling in cultured endothelial cells (HUVECs). This is in agreement with our previous results showing that the recombinant catalytic fragment of MASP-1 activates endothelial cells by cleaving protease activated receptor 4. Two other proteases, MASP-2 and MASP-3 are also associated with MBL. Earlier we showed that recombinant catalytic fragment of MASP-2 cannot activate HUVECs, and in this study we demonstrate that the same fragment of MASP-3 has also no effect. We find the same to be the case if we use recombinant forms of the N-terminal parts of MASP-1 and MASP-2 which only contain non-enzymatic domains. Moreover, stable zymogen mutant form of MASP-1 was also ineffective to stimulate endothelial cells, which suggests that in vivo MASP-1 have the ability to activate endothelial cells directly as well as to activate the lectin pathway simultaneously. We show that among the components of the MBL-MASPs complexes only MASP-1 is able to trigger response in HUVECs and the proteolytic activity of MASP-1 is essential. Our results strengthen the view that MASP-1 plays a central role in the early innate immune response.
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Affiliation(s)
- Márton Megyeri
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Karolina út 29, H-1113 Budapest, Hungary
| | - Péter K Jani
- 3rd Department of Medicine, Research Lab, Semmelweis University, Kútvölgyi út 4, H-1125 Budapest, Hungary
| | - Erika Kajdácsi
- 3rd Department of Medicine, Research Lab, Semmelweis University, Kútvölgyi út 4, H-1125 Budapest, Hungary
| | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Karolina út 29, H-1113 Budapest, Hungary
| | - Endre Schwaner
- 3rd Department of Medicine, Research Lab, Semmelweis University, Kútvölgyi út 4, H-1125 Budapest, Hungary
| | - Balázs Major
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Karolina út 29, H-1113 Budapest, Hungary
| | - János Rigó
- 1st Department of Obstetrics and Gynecology, Semmelweis University, Baross u. 27, H-1088 Budapest, Hungary
| | - Péter Závodszky
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Karolina út 29, H-1113 Budapest, Hungary
| | - Steffen Thiel
- Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark
| | - László Cervenak
- 3rd Department of Medicine, Research Lab, Semmelweis University, Kútvölgyi út 4, H-1125 Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Karolina út 29, H-1113 Budapest, Hungary.
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