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Dong X, Meng Z, Gu R, Zhu X, Gan H, Jin J, Liu J, Dou G. Predicting the metabolic characteristics of neorudin, a novel anticoagulant fusion protein, in patients with deep vein thrombosis. Thromb Res 2020; 194:121-134. [PMID: 32788104 DOI: 10.1016/j.thromres.2020.05.048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 05/25/2020] [Accepted: 05/27/2020] [Indexed: 01/09/2023]
Abstract
INTRODUCTION Recombinant neorudin (EPR-hirudin, EH) is an inactive prodrug that is converted to its active metabolite, hirudin variant 2-Lys47 (HV2), at the thrombus site. We aimed to investigate the mechanism underlying site-selective bioconversion of EH to HV2 at the thrombus target site and metabolic transformation of EH in patients with deep vein thrombosis (DVT). MATERIALS AND METHODS Metabolites in healthy volunteer plasma and urine after intravenous administration of EH were determined to elucidate how EH was metabolised after releasing HV2 at the target site in patients with DVT. After intravenous administration of EH in rats with venous thrombosis, the concentrations of EH in the blood and thrombus and the antithrombotic activity of EH were measured to predict whether EH could release HV2 at the thrombus site to exert anticoagulant effect in patients with DVT. RESULTS In healthy volunteers, EH and HV2 were predominantly excreted in the urine. Nine EH metabolites and ten HV2 metabolites truncated at the C-terminal were identified as N-terminal fragments, and these had the same cleavage sites. In rats with venous thrombosis, the area under the curve ratio of HV2 between the thrombus and blood was 29.5. The weight of wet thrombus was decreased with the production of HV2 by the cleavage of EH. The prothrombin time (PT) and prothrombin time (TT) changed proportionally to the concentration of EH and HV2 in the blood. CONCLUSION EH selectively accumulates and releases HV2 in the thrombus to exert antithrombotic effects, thus lowering the bleeding risk. Moreover, after conversion, EH may follow the same metabolic profile as that of HV2 in patients with DVT.
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Affiliation(s)
- Xiaona Dong
- Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing, China.
| | - Zhiyun Meng
- Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing, China.
| | - Ruolan Gu
- Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing, China
| | - Xiaoxia Zhu
- Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing, China
| | - Hui Gan
- Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing, China
| | - Jide Jin
- Laboratory of Experimental Hematology, Beijing Institute of Radiation Medicine, Beijing, China
| | - Jianglin Liu
- Beijing SUYA Pharmaceutical Lab, INC, Beijing, China
| | - Guifang Dou
- Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing, China.
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Huang Z, Song Y, Pang Z, Li M, Guliya Y, Shen Y, Qian J, Ge J. Fibrin-targeting delivery: a novel platform for cardiac regenerative medicine. J Cell Mol Med 2016; 20:2410-2413. [PMID: 27469290 PMCID: PMC5134394 DOI: 10.1111/jcmm.12912] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- Zheyong Huang
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Yanan Song
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Zhiqing Pang
- School of Pharmacy, Fudan University, Key Laboratory of Smart Drug Delivery, Ministry of Education, Shanghai, China
| | - Minghui Li
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Yerkintay Guliya
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Yunli Shen
- Department of Cardiology, Shanghai East Hospital, Tongji University, Shanghai, China
| | - Juying Qian
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Junbo Ge
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai, China
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Putelli A, Kiefer JD, Zadory M, Matasci M, Neri D. A fibrin-specific monoclonal antibody from a designed phage display library inhibits clot formation and localizes to tumors in vivo. J Mol Biol 2014; 426:3606-18. [PMID: 25073100 DOI: 10.1016/j.jmb.2014.07.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 07/02/2014] [Accepted: 07/16/2014] [Indexed: 11/28/2022]
Abstract
Fibrin formation from fibrinogen is a rare process in the healthy organism but is a pathological feature of thrombotic events, cancer and a wide range of inflammatory conditions. We have designed and constructed an antibody phage display library (containing 13 billion clones) for the selective recognition of the N-terminal peptide of fibrin alpha chain. The key structural feature for selective fibrin binding was a K94E mutation in the VH domain. From this library, an antibody was isolated (termed AP2), which recognizes the five N-terminal amino acids of fibrin with high affinity (Kd=44nM), but does not bind to fibrinogen. The AP2 antibody could be expressed in various formats (scFv, small immune protein and IgG) and inhibited fibrin clot formation in a concentration-dependent manner. Moreover, the AP2 antibody stained the fibrin-rich provisional stroma in solid tumors but did not exhibit any detectable staining toward normal tissues. Using a radioiodinated antibody preparation and quantitative biodistribution studies in tumor-bearing mice, AP2 was shown to selectively localize to fibrin-rich F9 murine teratocarcinomas, but not to SKRC-52 human kidney cancer xenografts. Collectively, the experiments indicate that the AP2 antibody recognizes fibrin in vitro and in vivo. The antibody may facilitate the development of fibrin-specific therapeutic agents.
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Affiliation(s)
- Alessia Putelli
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland.
| | - Jonathan D Kiefer
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland.
| | - Matthias Zadory
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland.
| | - Mattia Matasci
- Philochem AG, Libernstrasse 3, CH-8112 Otelfingen, Switzerland.
| | - Dario Neri
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland.
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Antithrombotic effects of naturally derived products on coagulation and platelet function. Methods Mol Biol 2010; 663:229-40. [PMID: 20617421 DOI: 10.1007/978-1-60761-803-4_9] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
To date, there have been few systematic studies of the antiplatelet and/or anticoagulant effects of natural products. According to the Natural Medicines Comprehensive Database, approximately 180 dietary supplements have the potential to interact with warfarin, and more than 120 may interact with aspirin, clopidogrel, and dipyridamole. These include anise and dong quai (anticoagulant effects); omega 3-fatty acids in fish oil, ajoene in garlic, ginger, ginko, and vitamin E (antiplatelet properties); fucus (heparin-like activity); danshen (antithrombin III-like activity and anticoagulant bioavailability); and St. John's Wort and American Ginseng (interference with drug metabolism). Other supplements, such as high doses of vitamin E (vitamin K antagonist activity), alfalfa (high-vitamin K content), and coenzyme Q10 (vitamin K-like activity), may affect blood clotting, which is dependent on vitamin K. Studies are needed to understand the role of various dietary supplements in thrombosis and their interactions with standard anticoagulants and antiplatelet drugs.
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Pedretti M, Rancic Z, Soltermann A, Herzog BA, Schliemann C, Lachat M, Neri D, Kaufmann PA. Comparative immunohistochemical staining of atherosclerotic plaques using F16, F8 and L19: Three clinical-grade fully human antibodies. Atherosclerosis 2009; 208:382-9. [PMID: 19699478 DOI: 10.1016/j.atherosclerosis.2009.07.043] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2009] [Revised: 06/29/2009] [Accepted: 07/23/2009] [Indexed: 01/04/2023]
Abstract
OBJECTIVE F16, F8 and L19 are three fully human monoclonal antibodies, specific to splice isoforms of tenascin-C and fibronectin, which stain sites of active tissue remodeling and which are currently in Phase I and II clinical trials as radio-immunoconjugates and immunocytokines in patients with cancer and arthritis. The characterization of atherosclerosis using these antibodies may open novel pharmacodelivery options for the imaging and treatment of cardiovascular conditions. It may also allow a better assessment of the corresponding immunoconjugates in polymorbid patients with atherosclerotic plaques. METHODS We performed a comparative immunohistochemical analysis with the F16, F8 and L19 antibodies in 28 freshly frozen human carotid plaques and in 11 normal arteries. Furthermore, we assessed the localization of the antibodies in relation to the infiltrating macrophages, vasa vasorum and Ki67-positive proliferating cells of the plaque. RESULTS The F16 antibody, specific to the extra-domain A1 of tenascin-C, stained plaques with a selective and intense pattern, while F8 and L19, specific to the EDA and EDB domains of fibronectin, respectively, exhibited a less selective and intense staining. In immunofluorescence, F16 was found to bind regions rich in macrophages, vasa vasorum and proliferating cells, while showing no detectable vs. weak staining of normal arteries and of quiescent plaque structures. CONCLUSION The human monoclonal antibody F16 stains areas of active tissue remodeling in atherosclerotic plaques and may thus deserve to be investigated as a suitable building block for the development of radiopharmaceuticals for plaque imaging or for the antibody-based targeted delivery of therapeutic agents to atherosclerotic lesions.
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Affiliation(s)
- Marta Pedretti
- Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
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Lovely RS, Boshkov LK, Marzec UM, Hanson SR, Farrell DH. Fibrinogen gamma' chain carboxy terminal peptide selectively inhibits the intrinsic coagulation pathway. Br J Haematol 2008; 139:494-503. [PMID: 17910639 DOI: 10.1111/j.1365-2141.2007.06825.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The minor gammaA/gamma' isoform of fibrinogen contains a high affinity binding site for thrombin exosite II that is lacking in the major fibrinogen isoform, gammaA/gammaA fibrinogen. The biological consequences of gamma' chain binding to thrombin were therefore investigated. Coagulation assays, thrombin activity assays, and a primate thrombosis model were used to characterize the biological effects of the gamma' 410-427 peptide. The gamma' peptide had little effect on thrombin cleavage of the small peptidyl substrate tosyl-glycyl-prolyl-arginine-4-nitranilide acetate. However, in vitro assays demonstrated that the gamma' peptide inhibited thrombin cleavage of larger proteinaceous substrates, including fibrinogen and factor VIII. The gamma' peptide inhibited the activated partial thromboplastin time in plasma and showed greater inhibition of activated partial thromboplastin time assays than prothrombin time assays, consistent with the inhibition of factor VIII cleavage. Studies in a baboon thrombosis model showed that the gamma' 410-427 peptide inhibited fibrin-rich thrombus formation (typical of venous thrombi) and, to a lesser extent, platelet-rich thrombus formation (typical of arterial thrombi). These results indicate that binding of thrombin exosite II by the gamma' peptide has selective effects on the intrinsic pathway.
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Affiliation(s)
- Rehana S Lovely
- Department of Pathology, School of Medicine, Oregon Health & Science University, Portland, OR 97239, USA
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Hagemeyer CE, Tomic I, Weirich U, Graeber J, Nordt T, Runge MS, Bode C, Peter K. Construction and characterization of a recombinant plasminogen activator composed of an anti-fibrin single-chain antibody and low-molecular-weight urokinase. J Thromb Haemost 2004; 2:797-803. [PMID: 15099287 DOI: 10.1111/j.1538-7836.2004.00697.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Targeting of plasminogen activators to the fibrin component of a thrombus by antibodies directed against human fibrin can enhance their thrombolytic potency and clot specificity. OBJECTIVES To overcome the disadvantages of chemical conjugation, we investigated whether the recombinant fusion of a single-chain antibody and a plasminogen activator results in an active bifunctional molecule that might be useful as a therapeutic agent. METHODS The cDNA of low-molecular-weight single-chain urokinase-type plasminogen activator, comprising amino acids Leu144-Leu411 (scuPA(LMW)), was cloned from human endothelial cells and fused to a single-chain antibody specific for the 7 N-terminal amino acids (beta(15-22)) in the beta-chain of human fibrin (scFv(59D8)). The fusion protein was purified using affinity chromatography with the beta(15-22)-peptide of human fibrin. RESULTS Purified scFv(59D8)-scuPA(LMW) migrated as a 60-kDa band, which is consistent with a molecule composed of one scFv(59D8) and one scuPA(LMW) moiety. Both functions of the fusion molecule, fibrin-specific binding and plasminogen activation, were fully preserved. In human plasma clots, thrombolysis by scFv(59D8)-scuPA(LMW) is significantly faster and more potent compared with the clinically used urokinase. CONCLUSIONS ScFv(59D8)-scuPA(LMW) constitutes a new recombinant chimeric plasminogen activator with a significantly enhanced thrombolytic potency and relative fibrin selectivity, that can be produced with modern methods at low cost, large quantities and reproducible activity in Escherichia coli.
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Affiliation(s)
- C E Hagemeyer
- Department of Cardiology, University of Freiburg, Freiburg, Germany
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Peter K, Gupta A, Nordt T, Bauer S, Runge MS, Bode C. Construction and in vitro testing of a novel fab-hirudin-based fusion protein that targets fibrin and inhibits thrombin in a factor xa-dependent manner. J Cardiovasc Pharmacol 2003; 42:237-44. [PMID: 12883328 DOI: 10.1097/00005344-200308000-00013] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Fibrin targeting of the thrombin inhibitor hirudin via chemical coupling is effective in vitro and in vivo. However, since chemical coupling has limitations, a recombinant approach was taken to improve the fibrin-targeting ability of hirudin. Additionally, to activate hirudin selectively at the target area and thereby limit side effects in an in vivo setting, the authors aimed to construct an inactive precursor molecule that is converted into an active thrombin inhibitor only upon cleavage by factor Xa. Using PCR, the coding region for hirudin was fused to parts of the genomic DNA of the IgG heavy chain that was cloned from the antifibrin antibody-producing hybridoma cell line 59D8. Additionally, a factor Xa recognition site was introduced between the antibody and the hirudin sequence. The fusion construct was then transfected into a heavy-chain loss variant of the hybridoma cell line 59D8. After selection of stable hybridoma clones, the expressed fusion protein was evaluated for its molecular size (57 kd) and its binding ability to the fibrin-specific peptide Bbeta 15-22. The cleavage of the fusion protein by factor Xa was demonstrated by HPLC. The recombinant anticoagulant revealed antithrombin activity only after cleavage by factor Xa. Thus, the newly designed hirudin fusion protein revealed the anticipated functions in vitro. Further experiments are needed to prove whether this precursor anticoagulant allows a highly clot-specific and efficient thrombin inhibition in vivo.
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Affiliation(s)
- Karlheinz Peter
- Department of Cardiology and Angiology, Internal Medicine III, University of Freiburg, Hugstetter Strasse 55, 79106 Freiburg, Germany.
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Soslau G, Class R, Morgan DA, Foster C, Lord ST, Marchese P, Ruggeri ZM. Unique pathway of thrombin-induced platelet aggregation mediated by glycoprotein Ib. J Biol Chem 2001; 276:21173-83. [PMID: 11283012 DOI: 10.1074/jbc.m008249200] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Thrombin plays a central role in normal and abnormal hemostatic processes. It is assumed that alpha-thrombin activates platelets by hydrolyzing the protease-activated receptor (PAR)-1, thereby exposing a new N-terminal sequence, a tethered ligand, which initiates a cascade of molecular reactions leading to thrombus formation. This process involves cross-linking of adjacent platelets mediated by the interaction of activated glycoprotein (GP) IIb/IIIa with distinct amino acid sequences, LGGAKQAGDV and/or RGD, at each end of dimeric fibrinogen molecules. We demonstrate here the existence of a second alpha-thrombin-induced platelet-activating pathway, dependent on GP Ib, which does not require hydrolysis of a substrate receptor, utilizes polymerizing fibrin instead of fibrinogen, and can be inhibited by the Fab fragment of the monoclonal antibody LJIb-10 bound to the GP Ib thrombin-binding site or by the cobra venom metalloproteinase, mocarhagin, that hydrolyzes the extracellular portion of GP Ib. This alternative alpha-thrombin pathway is observed when PAR-1 or GP IIb/IIIa is inhibited. The recognition sites involved in the cross-linking of polymerizing fibrin and surface integrins via the GP Ib pathway are different from those associated with fibrinogen. This pathway is insensitive to RGDS and anti-GP IIb/IIIa antibodies but reactive with a mutant fibrinogen, gamma407, with a deletion of the gamma-chain sequence, AGDV. The reaction is not due to simple trapping of platelets by the fibrin clot, since ligand binding, signal transduction, and second messenger formation are required. The GP Ib pathway is accompanied by mobilization of internal calcium and the platelet release reaction. This latter aspect is not observed with ristocetin-induced GP Ib-von Willebrand factor agglutination nor with GP Ib-von Willebrand factor-polymerizing fibrin trapping of platelets. Human platelets also respond to gamma-thrombin, an autoproteolytic product of alpha-thrombin, through PAR-4. Co-activation of the GP Ib, PAR-1, and PAR-4 pathways elicit synergistic responses. The presence of the GP Ib pathway may explain why anti-alpha-thrombin/anti-platelet regimens fail to completely abrogate thrombosis/restenosis in the cardiac patient.
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Affiliation(s)
- G Soslau
- Department of Biochemistry, Division of Hematology/Oncology, MCP Hahnemann School of Medicine, Philadelphia, Pennsylvania 19102, USA
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