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A Naphthalenic Derivative ND-1 Inhibits Thrombus Formation by Interfering the Binding of Fibrinogen to Integrin αIIb β3. BIOMED RESEARCH INTERNATIONAL 2016; 2016:8587164. [PMID: 28097150 PMCID: PMC5206433 DOI: 10.1155/2016/8587164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 10/28/2016] [Accepted: 11/10/2016] [Indexed: 12/24/2022]
Abstract
Integrin αIIbβ3 plays a crucial role in the process of platelet aggregation. Three integrin αIIbβ3 antagonists (abciximab, eptifibatide, and tirofiban) have been approved by FDA for clinical use. Unfortunately, they all showed severe side effects such as thrombocytopenia and bleeding risk. Thus, researches on the development of more effective and safer antiplatelet agents are needed. In this manuscript we reported a novel naphthalenic derivative compound ND-1 with potent antithrombotic effect and lower bleeding risk. ND-1 inhibited ADP-, collagen-, thrombin-, and U46619-induced platelet aggregation with IC50 values of 1.29, 14.46, 12.84, and 40.24 μM, respectively. Mechanism studies indicated that ND-1 inhibited the binding of fibrinogen to integrin αIIbβ3 in a dose-dependent manner with an IC50 value of 3.12 μM. ND-1 inhibited P-selectin expression induced by ADP, collagen, thrombin, and U46619 on the surface of platelets. Additionally, this compound reduced platelets spreading to the immobilized fibrinogen. In vivo, ND-1 potently decreased thrombus formation in an arteriovenous shunt thrombosis model in rats and slightly prolonged bleeding time in a tail cutting model in mice. Taken together, our results reveal that ND-1 is a novel antagonist of αIIbβ3 with strong antithrombotic effect and lower bleeding risk.
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Oikonomou EK, Repanas TI, Papanastasiou C, Kokkinidis DG, Miligkos M, Feher A, Gupta D, Kampaktsis PN. The effect of in-hospital acquired thrombocytopenia on the outcome of patients with acute coronary syndromes: A systematic review and meta-analysis. Thromb Res 2016; 147:64-71. [PMID: 27689317 DOI: 10.1016/j.thromres.2016.09.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2016] [Revised: 09/15/2016] [Accepted: 09/22/2016] [Indexed: 01/22/2023]
Abstract
BACKGROUND In-hospital acquired thrombocytopenia (TP) is relatively common among patients hospitalized with acute coronary syndromes (ACS). However, its effect on short-term and long-term outcomes has yet to be reviewed systematically. METHODS We conducted a systematic review and meta-analysis of clinical studies assessing the relationship between new-onset in-hospital TP and adverse outcomes among ACS patients. MEDLINE, Scopus and the Cochrane Library were searched for eligible studies published before March 20, 2016. RESULTS Ten studies reporting on a total of 142,161 ACS patients were identified. 8133 patients showed evidence of new-onset TP during the course of their hospitalization. Compared with patients with normal platelet counts, patients with new-onset TP had a prolonged in-hospital stay, significantly higher risk of both short-term mortality (<30days) (Odds ratio (OR) [95% confidence interval (CI)]: 5.58 [3.63-8.57]) and late death (6months to 1year) (OR [95% CI]: 3.45 [2.35-5.07]), as well as a significantly higher risk of major bleeding events in the first 30days (OR [95% CI]: 6.93 [5.13-9.38]). In addition, risk for other secondary cardiovascular endpoints, including recurrent myocardial infarction, stroke, in-hospital heart failure, stent thrombosis and unplanned revascularization was also significantly higher in the TP versus the no TP group. CONCLUSIONS Development of TP during the in-hospital management of ACS patients is a significant predictor of both short- and long-term adverse events, including mortality. In the light of this evidence, clinicians should be cautious and closely monitor abnormal platelet counts that present early following an ACS.
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Affiliation(s)
- Evangelos K Oikonomou
- Society of Junior Doctors, Athens, Greece; National and Kapodistrian University of Athens, Faculty of Medicine, Athens, Greece.
| | | | - Christos Papanastasiou
- Society of Junior Doctors, Athens, Greece; Aristotle University of Thessaloniki, School of Medicine, Thessaloniki, Greece
| | - Damianos G Kokkinidis
- Society of Junior Doctors, Athens, Greece; Aristotle University of Thessaloniki, School of Medicine, Thessaloniki, Greece
| | - Michael Miligkos
- Society of Junior Doctors, Athens, Greece; Laboratory of Biomathematics, University of Thessaly School of Medicine, Larissa, Greece
| | - Attila Feher
- New York Presbyterian Hospital/Weill Cornell Medical College, Department of Medicine, NY, USA
| | - Dipti Gupta
- Memorial Sloan Kettering Cancer Center, Cardiology Service, New York, USA
| | - Polydoros N Kampaktsis
- Society of Junior Doctors, Athens, Greece; New York Presbyterian Hospital/Weill Cornell Medical College, Department of Medicine, NY, USA
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Abstract
During the past decade, advanced techniques in structural biology have provided atomic level information on the platelet integrin αIIbβ3 activation mechanism that results in it adopting a high-affinity ligand-binding conformation(s). This review focuses on advances in imaging intact αIIbβ3 in a lipid bilayer in the absence of detergent and new structural insights into the changes in the ligand-binding pocket with receptor activation and ligand binding. It concludes with descriptions of novel therapeutic αIIbβ3 antagonists being developed based on an advanced knowledge of the receptor's structure.
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Affiliation(s)
- B S Coller
- Rockefeller University, New York, NY, USA
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Kong Y, Wang Y, Yang W, Xie Z, Li Z. LX0702, a novel snake venom peptide derivative, inhibits thrombus formation via affecting the binding of fibrinogen with GPIIb/IIIa. J Pharmacol Sci 2015; 127:462-6. [DOI: 10.1016/j.jphs.2015.03.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 03/19/2015] [Accepted: 03/24/2015] [Indexed: 11/27/2022] Open
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Wang Y, Zhao Y, Sun R, Kong W, Wang B, Yang G, Li Y. Discovery of novel antagonists of glycoprotein IIb/IIIa-mediated platelet aggregation through virtual screening. Bioorg Med Chem Lett 2015; 25:1249-53. [PMID: 25677660 DOI: 10.1016/j.bmcl.2015.01.053] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 01/19/2015] [Accepted: 01/22/2015] [Indexed: 11/26/2022]
Abstract
The glycoprotein IIb/IIIa receptor is the final common pathway of platelet aggregation, regardless of the agonist, and thus represents an ideal therapeutic target for blocking thrombus formation. RUC-2 is a novel glycoprotein IIb/IIIa inhibitor of adenosine-5'-diphosphate (ADP)-induced platelet aggregation, importantly which exhibits a unique mode of binding with respect to classical Arg-Gly-Asp (RGD)-based glycoprotein IIb/IIIa antagonists. To identify new chemotypes that inhibit glycoprotein IIb/IIIa-mediated platelet aggregation like RUC-2, we performed a combination of structure-based pharmacophore screening and structure-based virtual screening approach to screen over 7.3 million small molecules based on the RUC-2-glycoprotein IIb/IIIa crystal structure. Three of the eleven hit compounds identified by virtual screening showed promising activity with IC50 values between 16.9 and 90.6μmolL(-1) in a human platelet aggregation assay induced by ADP and thrombin. The binding conformations of these three were analyzed to provide a rationalization of their activity profile. These compounds may serve as potential novel scaffolds for further development of glycoprotein IIb/IIIa antagonists.
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Affiliation(s)
- Yawen Wang
- First Affiliated Hospital, College of Medicine, Xi'an Jiaotong University, Xi'an 710061, PR China
| | - Yang Zhao
- School of Pharmacy, Xi'an Jiaotong University, No. 76 Yanta West Road, Xi'an 710061, PR China
| | - Rui Sun
- School of Pharmacy, Xi'an Jiaotong University, No. 76 Yanta West Road, Xi'an 710061, PR China
| | - Wanjun Kong
- School of Pharmacy, Xi'an Jiaotong University, No. 76 Yanta West Road, Xi'an 710061, PR China
| | - Bing Wang
- College of Medicine, Xi'an Jiaotong University, Xi'an 710061, PR China
| | - Guangde Yang
- School of Pharmacy, Xi'an Jiaotong University, No. 76 Yanta West Road, Xi'an 710061, PR China
| | - Yiping Li
- School of Pharmacy, Xi'an Jiaotong University, No. 76 Yanta West Road, Xi'an 710061, PR China.
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Abstract
Arterial thrombosis is the leading causes of morbidity and mortality worldwide, whereas venous thrombosis is the most common preventable cause of hospital death. In either case, venous and arterial thrombosis should be considered autonomous entities, with only minor overlaps in terms of risk factors, predisposing conditions and pathogenesis. Besides the widespread perception of embolization originating from low-pressure venous system and triggering ischemic stroke or peripheral arterial occlusion, "paradoxical" thrombosis might also develop or occur within clinical or biological circumstances where the blood should be less predisposed to clot, and wherein this risk is mostly unpredictable or overlooked. In this article we review epidemiological evidence and potential pathogenetic mechanisms of paradoxical thrombosis developing during antithrombotic therapy with vitamin K antagonists and heparin (i.e. heparin-induced thrombocytopenia), or antiplatelet agents such as aspirin, glycoprotein IIb/IIIa inhibitors or clopidogrel, and mostly attributable to direct effect of the agent.
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Negri A, Li J, Naini S, Coller BS, Filizola M. Structure-based virtual screening of small-molecule antagonists of platelet integrin αIIbβ3 that do not prime the receptor to bind ligand. J Comput Aided Mol Des 2012; 26:1005-15. [PMID: 22893377 DOI: 10.1007/s10822-012-9594-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Accepted: 08/07/2012] [Indexed: 10/28/2022]
Abstract
Integrin αIIbβ3 has emerged as an important therapeutic target for thrombotic vascular diseases owing to its pivotal role in mediating platelet aggregation through interaction with adhesive ligands. In the search for effective anti-thrombotic agents that can be administered orally without inducing the high-affinity ligand binding state, we recently discovered via high-throughput screening of 33,264 compounds a novel, αIIbβ3-selective inhibitor (RUC-1) of adenosine-5'-diphosphate (ADP) -induced platelet aggregation that exhibits a different chemical scaffold and mode of binding with respect to classical Arg-Gly-Asp (RGD)-mimicking αIIbβ3 antagonists. Most importantly, RUC-1 and its higher-affinity derivative, RUC-2, do not induce major conformational changes in the protein β3 subunit or prime the receptor to bind ligand. To identify additional αIIbβ3-selective chemotypes that inhibit platelet aggregation through similar mechanisms, we screened in silico over 2.5 million commercially available, 'lead-like' small molecules based on complementarity to the predicted binding mode of RUC-2 into the RUC-1-αIIbβ3 crystal structure. This first reported structure-based virtual screening application to the αIIbβ3 integrin led to the identification of 2 αIIbβ3-selective antagonists out of 4 tested, which compares favorably with the 0.003 % "hit rate" of our previous high-throughput chemical screening study. The newly identified compounds, like RUC-1 and RUC-2, showed specificity for αIIbβ3 compared to αVβ3 and did not prime the receptor to bind ligand. They thus may hold promise as αIIbβ3 antagonist therapeutic scaffolds.
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Affiliation(s)
- Ana Negri
- Department of Structural and Chemical Biology, Mount Sinai School of Medicine, 1425 Madison Avenue, Box 1677, New York, NY 10029-6574, USA
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Zhu J, Choi WS, McCoy JG, Negri A, Zhu J, Naini S, Li J, Shen M, Huang W, Bougie D, Rasmussen M, Aster R, Thomas CJ, Filizola M, Springer TA, Coller BS. Structure-guided design of a high-affinity platelet integrin αIIbβ3 receptor antagonist that disrupts Mg²⁺ binding to the MIDAS. Sci Transl Med 2012; 4:125ra32. [PMID: 22422993 PMCID: PMC3390238 DOI: 10.1126/scitranslmed.3003576] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
An integrin found on platelets, α(IIb)β(3) mediates platelet aggregation, and α(IIb)β(3) antagonists are effective antithrombotic agents in the clinic. Ligands bind to integrins in part by coordinating a magnesium ion (Mg(2+)) located in the β subunit metal ion-dependent adhesion site (MIDAS). Drugs patterned on the integrin ligand sequence Arg-Gly-Asp have a basic moiety that binds the α(IIb) subunit and a carboxyl group that coordinates the MIDAS Mg(2+) in the β(3) subunits. They induce conformational changes in the β(3) subunit that may have negative consequences such as exposing previously hidden epitopes and inducing the active conformation of the receptor. We recently reported an inhibitor of α(IIb)β(3) (RUC-1) that binds exclusively to the α(IIb) subunit; here, we report the structure-based design and synthesis of RUC-2, a RUC-1 derivative with a ~100-fold higher affinity. RUC-2 does not induce major conformational changes in β(3) as judged by monoclonal antibody binding, light scattering, gel chromatography, electron microscopy, and a receptor priming assay. X-ray crystallography of the RUC-2-α(IIb)β(3) headpiece complex in 1 mM calcium ion (Ca(2+))/5 mM Mg(2+) at 2.6 Å revealed that RUC-2 binds to α(IIb) the way RUC-1 does, but in addition, it binds to the β(3) MIDAS residue glutamic acid 220, thus displacing Mg(2+) from the MIDAS. When the Mg(2+) concentration was increased to 20 mM, however, Mg(2+) was identified in the MIDAS and RUC-2 was absent. RUC-2's ability to inhibit ligand binding and platelet aggregation was diminished by increasing the Mg(2+) concentration. Thus, RUC-2 inhibits ligand binding by a mechanism different from that of all other α(IIb)β(3) antagonists and may offer advantages as a therapeutic agent.
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Affiliation(s)
- Jieqing Zhu
- Immune Disease Institute, Children’s Hospital Boston, and Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
- BloodCenter of Wisconsin, Medical College of Wisconsin, Milwaukee, WI 53201, USA
| | - Won-Seok Choi
- Laboratory of Blood and Vascular Biology, Rockefeller University, New York, NY 10065, USA
| | - Joshua G. McCoy
- NIH Chemical Genomics Center, National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, MD 20892, USA
| | - Ana Negri
- Department of Structural and Chemical Biology, Mount Sinai School of Medicine, New York, NY 10029, USA
| | - Jianghai Zhu
- Immune Disease Institute, Children’s Hospital Boston, and Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
| | - Sarasija Naini
- Laboratory of Blood and Vascular Biology, Rockefeller University, New York, NY 10065, USA
| | - Jihong Li
- Laboratory of Blood and Vascular Biology, Rockefeller University, New York, NY 10065, USA
| | - Min Shen
- NIH Chemical Genomics Center, National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, MD 20892, USA
| | - Wenwei Huang
- NIH Chemical Genomics Center, National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, MD 20892, USA
| | - Daniel Bougie
- BloodCenter of Wisconsin, Medical College of Wisconsin, Milwaukee, WI 53201, USA
| | - Mark Rasmussen
- BloodCenter of Wisconsin, Medical College of Wisconsin, Milwaukee, WI 53201, USA
| | - Richard Aster
- BloodCenter of Wisconsin, Medical College of Wisconsin, Milwaukee, WI 53201, USA
| | - Craig J. Thomas
- NIH Chemical Genomics Center, National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, MD 20892, USA
| | - Marta Filizola
- Department of Structural and Chemical Biology, Mount Sinai School of Medicine, New York, NY 10029, USA
| | - Timothy A. Springer
- Immune Disease Institute, Children’s Hospital Boston, and Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
| | - Barry S. Coller
- Laboratory of Blood and Vascular Biology, Rockefeller University, New York, NY 10065, USA
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Kaluski E. The Role of Glycoprotein IIb/IIIa Inhibitors- A Promise Not Kept? Curr Cardiol Rev 2011; 4:84-91. [PMID: 19936282 PMCID: PMC2779356 DOI: 10.2174/157340308784245793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2007] [Revised: 05/17/2007] [Accepted: 05/30/2007] [Indexed: 11/22/2022] Open
Abstract
For over one decade Glycoproteins IIb/IIIa inhibitors (GPI) have been administered to prevent coronary artery thrombosis. Initially these agents were used for acute coronary syndromes and subsequently as adjunctive pharmacotherapy for percutaneous coronary interventions (PCIs). Most benefit of GPI emerged from reduction of ischemic events: mostly non-q-wave myocardial infarctions (NQWMIs) during PCI. However, individual randomized clinical trials could not demonstrate that any of these agents could significantly reduce mortality in any clinical subset of patients. Studies of employing prolonged oral GPI administration resulted in excessive death. The non-homogenous statistically-significant reduction of ischemic endpoints was accompanied by an excess of bleeding, vascular complications, and thrombocytopenia. The clinical and ecomomic burden of major bleeding and thrombocytopenia is substantial. The ACUITY trial has initiate a new debate regarding the efficacy and safety of GPI. Selective “patient-tailored” use of GPI limited to moderate-high risk PCI patients with low bleeding propensity is suggested. Research of new algorithms emphasizing abbreviated GPI administration, careful access site and bleeding surveillance, in conjunction with lower doses of unfractionated heparin or new and safer anti-thrombins may further enhance patient safety.
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Affiliation(s)
- Edo Kaluski
- Department of Cardiology, University Medical Center, University of Medicine and Dentistry, Newark, NJ, USA
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Kaluski E, Haider B, Milo-Cotter O, Klapholz M. Glycoprotein IIb/IIIa inhibitors: questioning indications and treatment algorithms. CARDIOVASCULAR REVASCULARIZATION MEDICINE 2007; 8:281-8. [PMID: 18053951 DOI: 10.1016/j.carrev.2007.03.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2007] [Accepted: 03/30/2007] [Indexed: 11/27/2022]
Abstract
Glycoprotein inhibitors (GPI) are viewed as beneficial adjunctive pharmacotherapy agents for percutaneous coronary interventions (PCIs). The major benefit of GPI is derived from the reduction of ischemic events (mostly non-Q-wave myocardial infarctions) during PCI. There is no single randomized clinical trial demonstrating that any of these agents significantly reduces mortality in any clinical subset of patients. Studies of sustained oral GPI resulted in excessive death and myocardial infarctions. Reduction of ischemic end points was counteracted by excessive bleeding, vascular complications, and thrombocytopenia. These complications bear considerable medical and economic impact. The Acute Catheterization and Early Intervention Triage Strategy trial demonstrated that GPI, when added to heparin, enoxaparine, or bivalirudin, do not reduce mortality or ischemic events but significantly increase bleeding complications. Major bleeding resulted in threefold mortality at 1 year. In view of available data, the use of GPI should be limited to moderate-risk to high-risk PCI patients with low bleeding propensity. Protocols of abbreviated GPI administration and careful bleeding surveillance, in conjunction with lower doses of unfractionated heparin or new and possibly safer antithrombins, can potentially improve patient safety.
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Affiliation(s)
- Edo Kaluski
- Department of Cardiology, University Medical Center, University of Medicine and Dentistry, Newark, NJ 07101, USA.
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