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Priya V, Samridhi, Singh N, Dash D, Muthu MS. Nattokinase Encapsulated Nanomedicine for Targeted Thrombolysis: Development, Improved in Vivo Thrombolytic Effects, and Ultrasound/Photoacoustic Imaging. Mol Pharm 2024; 21:283-302. [PMID: 38126777 DOI: 10.1021/acs.molpharmaceut.3c00830] [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] [Indexed: 12/23/2023]
Abstract
Nattokinase (NK), a potent thrombolytic enzyme that dissolves blood clots, is highly used in the treatment of cardiovascular disorders. However, its effective delivery remains demanding because of stability and bioavailability problems owing to its high molecular weight and proteineous nature. In this research, we have developed novel NK-loaded nontargeted liposomes (NK-LS) and targeted liposomes (RGD-NK-LS and AM-NK-LS) by the reverse phase evaporation method. The physiochemical characterizations (particle size, polydispersity index, zeta potential, and morphology) were performed by a Zetasizer, SEM, TEM, and AFM. The Bradford assay and XPS analysis confirmed the successful surface conjugation of the targeting ligands. Platelet interaction studies by CLSM, photon imager optima, and flow cytometry showed significantly higher (P < 0.05) platelet binding affinity of targeted liposomes. In vitro evaluations were performed using human blood and a fibrinolysis study by CLSM imaging demonstrating the potent antithrombotic efficacy of AM-NK-LS. Furthermore, bleeding and clotting time studies revealed that the targeted liposomes were free from any bleeding complications. Moreover, the in vivo FeCl3 model on Sprague-Dawley (SD) rats using a Doppler flow meter and ultrasound/photoacoustic imaging indicated the increased % thrombolysis and potent affinity of targeted liposomes toward the thrombus site. Additionally, in vitro hemocompatibility and histopathology studies demonstrated the safety and biocompatibility of the nanoformulations.
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Affiliation(s)
- Vishnu Priya
- Department of Pharmaceutical Engineering and Technology, IIT (BHU), Varanasi 221005, U.P., India
| | - Samridhi
- Department of Pharmaceutical Engineering and Technology, IIT (BHU), Varanasi 221005, U.P., India
| | - Nitesh Singh
- Department of Biochemistry, Institute of Medical Sciences, Banaras Hindu University, Varanasi 221005, U.P., India
| | - Debabrata Dash
- Department of Biochemistry, Institute of Medical Sciences, Banaras Hindu University, Varanasi 221005, U.P., India
| | - Madaswamy S Muthu
- Department of Pharmaceutical Engineering and Technology, IIT (BHU), Varanasi 221005, U.P., India
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Priya V, Singh SK, Revand R, Kumar S, Mehata AK, Sushmitha P, Mahto SK, Muthu MS. GPIIb/IIIa Receptor Targeted Rutin Loaded Liposomes for Site-Specific Antithrombotic Effect. Mol Pharm 2023; 20:663-679. [PMID: 36413707 DOI: 10.1021/acs.molpharmaceut.2c00848] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Rutin (RUT) is a flavonoid obtained from a natural source and is reported for antithrombotic potential, but its delivery remains challenging because of its poor solubility and bioavailability. In this research, we have fabricated novel rutin loaded liposomes (RUT-LIPO, nontargeted), liposomes conjugated with RGD peptide (RGD-RUT-LIPO, targeted), and abciximab (ABX-RUT-LIPO, targeted) by ethanol injection method. The particle size, ζ potential, and morphology of prepared liposomes were analyzed by using DLS, SEM, and TEM techniques. The conjugation of targeting moiety on the surface of targeted liposomes was confirmed by XPS analysis and Bradford assay. In vitro assessment such as blood clot assay, aPTT assay, PT assay, and platelet aggregation analysis was performed using human blood which showed the superior antithrombotic potential of ABX-RUT-LIPO and RGD-RUT-LIPO liposomes. The clot targeting efficiency was evaluated by in vitro imaging and confocal laser scanning microscopy. A significant (P < 0.05) rise in the affinity of targeted liposomes toward activated platelets was demonstrated that revealed their remarkable potential in inhibiting thrombus formation. Furthermore, an in vivo study executed on Sprague Dawley rats (FeCl3 model) demonstrated improved antithrombotic activity of RGD-RUT-LIPO and ABX-RUT-LIPO compared with pure drug. The pharmacokinetic study performed on rats demonstrates the increase in bioavailability when administered as liposomal formulation as compared to RUT. Moreover, the tail bleeding assay and clotting time study (Swiss Albino mice) indicated a better antithrombotic efficacy of targeted liposomes than control preparations. Additionally, biocompatibility of liposomal formulations was determined by an in vitro hemolysis study and cytotoxicity assay, which showed that they were hemocompatible and safe for human use. A histopathology study on rats suggested no severe toxicity of prepared liposomal formulations. Thus, RUT encapsulated nontargeted and targeted liposomes exhibited superior antithrombotic potential over RUT and could be used as a promising carrier for future use.
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Affiliation(s)
- Vishnu Priya
- Department of Pharmaceutical Engineering and Technology, IIT (BHU), Varanasi221005, UP, India
| | - Sanjeev K Singh
- Department of Physiology, IMS, Banaras Hindu University, Varanasi221005, India
| | - Ravindran Revand
- Department of Physiology, IMS, Banaras Hindu University, Varanasi221005, India
| | - Sandip Kumar
- Department of Pathology, IMS, Banaras Hindu University, Varanasi221005, India
| | - Abhishesh Kumar Mehata
- Department of Pharmaceutical Engineering and Technology, IIT (BHU), Varanasi221005, UP, India
| | - Paulraj Sushmitha
- School of Biomedical Engineering, IIT (BHU), Varanasi221005, UPIndia
| | | | - Madaswamy S Muthu
- Department of Pharmaceutical Engineering and Technology, IIT (BHU), Varanasi221005, UP, India
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3
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Saito MS, Zatta KC, Sathler PC, Furtado PS, C O Miguel N, Frattani FF, Berger M, Lavayen V, Pohlmann AR, Guterres SS. Therapeutic implementation in arterial thrombosis with pulmonary administration of fucoidan microparticles containing acetylsalicylic acid. Int J Pharm 2022; 622:121841. [PMID: 35623486 DOI: 10.1016/j.ijpharm.2022.121841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 05/13/2022] [Accepted: 05/15/2022] [Indexed: 11/16/2022]
Abstract
Several antithrombotic drugs are available to treat cardiovascular diseases due to its high mortality and morbidity worldwide. Despite these, severe adverse effects that can lead to treatment withdrawal have been described, highlighting the importance of new therapies. Thus, this work describes the development of fucoidan microparticles containing acetylsalicylic acid (MP/F4M) for pulmonary delivery and in vitro, ex vivo, and in vivo evaluation. Microparticles were prepared via spray-drying and characterized in vitro (mucoadhesive properties, coagulation time, platelet aggregation, adhesion, and hemolysis) followed by ex vivo platelet aggregation, in vivo arterial thrombosis, and hemorrhagic profile. The formulation physicochemical characterization showed suitable characteristics along with delayed drug release, increased breathable particle fraction, and high washability resistance as well as antiplatelet activity and enhanced platelet adhesion in vitro. In in vivo assays, MP/F4M protected against arterial thrombosis, without changes in the hemorrhagic profile. Finally, no lung changes were observed after prolonged pulmonary administration, whereas isolated ASA led to an inflammatory response. In conclusion, pulmonary administration of fucoidan microparticles with an antiplatelet drug may be an alternative therapy to treat cardiovascular diseases, opening the field for different formulations.
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Affiliation(s)
- Max S Saito
- Postgraduate Program in Pharmaceutical Sciences, Federal University of Rio Grande do Sul, RS, Brazil.
| | - Kelly C Zatta
- Postgraduate Program in Pharmaceutical Sciences, Federal University of Rio Grande do Sul, RS, Brazil
| | - Plínio C Sathler
- Department of Clinical and Toxicological Analysis, Faculty of Pharmacy, Federal University of Rio de Janeiro
| | - Priscila S Furtado
- Department of Clinical and Toxicological Analysis, Faculty of Pharmacy, Federal University of Rio de Janeiro
| | - Nádia C O Miguel
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Flávia F Frattani
- Department of Clinical and Toxicological Analysis, Faculty of Pharmacy, Federal University of Rio de Janeiro
| | - Markus Berger
- Laboratory of Biochemical Pharmacology, Experimental Research Center, Hospital de Clinicas de Porto Alegre, Federal University of Rio Grande do Sul
| | - Vladimir Lavayen
- Postgraduate Program in Chemistry, Federal University of Rio Grande do Sul, RS, Brazil
| | - Adriana R Pohlmann
- Postgraduate Program in Pharmaceutical Sciences, Federal University of Rio Grande do Sul, RS, Brazil
| | - Sílvia S Guterres
- Postgraduate Program in Pharmaceutical Sciences, Federal University of Rio Grande do Sul, RS, Brazil
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Lin X, Zhao P, Lin Z, Chen J, Bingwa LA, Siaw-Debrah F, Zhang P, Jin K, Yang S, Zhuge Q. Establishment of a Modified and Standardized Ferric Chloride-Induced Rat Carotid Artery Thrombosis Model. ACS OMEGA 2022; 7:8919-8927. [PMID: 35309441 PMCID: PMC8928333 DOI: 10.1021/acsomega.1c07316] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 02/21/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Ferric chloride is widely utilized in inducing thrombosis in small vessels of experimental animals. However, the lack of its application in large blood vessels of experimental animals and inconsistent concentration has limited its application. Therefore, we systematically tested the most suitable concentration and reliable induction time in the experiment of using ferric chloride to induce rat carotid artery thrombosis. METHODS In this study, we selected the common carotid artery of 59 Sprague-Dawley rats as the target vessel. The exploration process was divided into three stages. First, to determine the optimum induction concentration, we compared the effects of 30-60% ferric chloride on thrombus formation within 24 h. Second, to confirm the handling time, we tested different induction times from 3 min to 10 min. Lastly, we used the thrombolytic drug rt-PA to detect whether the formed thrombus can be lysed. Doppler blood flow imaging and H-E staining were employed to estimate the blood flow and thrombus. The ATP levels in the brain were measured using a bioluminescence ATP assay kit. RESULTS We found that the application of 50% ferric chloride for 10 min was enough to successfully induce thrombosis in the rat carotid artery and without spontaneous thrombolysis after 24 h. It is better than other concentrations and will lead to the decline of the ATP content in the ischemic hemisphere. CONCLUSIONS Our results indicate that the rat carotid artery thrombosis model induced by 50% ferric chloride for 10 min is stable and reliable.
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Affiliation(s)
- Xiao Lin
- Department
of Neurosurgery, The First Affiliated Hospital
of Wenzhou Medical University, Wenzhou 325000 China
- Zhejiang
Provincial Key Laboratory of Aging and Neurological Disorder Research, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000 China
| | - Peiqi Zhao
- Department
of Neurosurgery, The First Affiliated Hospital
of Wenzhou Medical University, Wenzhou 325000 China
- Zhejiang
Provincial Key Laboratory of Aging and Neurological Disorder Research, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000 China
| | - Zhongxiao Lin
- Department
of Neurosurgery, The First Affiliated Hospital
of Wenzhou Medical University, Wenzhou 325000 China
- Zhejiang
Provincial Key Laboratory of Aging and Neurological Disorder Research, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000 China
| | - Jiayu Chen
- Department
of Neurosurgery, The First Affiliated Hospital
of Wenzhou Medical University, Wenzhou 325000 China
- Zhejiang
Provincial Key Laboratory of Aging and Neurological Disorder Research, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000 China
| | - Lebohang Anesu Bingwa
- Department
of Neurosurgery, The First Affiliated Hospital
of Wenzhou Medical University, Wenzhou 325000 China
| | - Felix Siaw-Debrah
- Department
of Neurosurgery, Korlebu Teaching Hospital, Korlebu, Ghana 00233, West Africa
| | - Peng Zhang
- Department
of Neurosurgery, The First Affiliated Hospital
of Wenzhou Medical University, Wenzhou 325000 China
- Zhejiang
Provincial Key Laboratory of Aging and Neurological Disorder Research, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000 China
| | - Kunlin Jin
- Department
of Pharmacology and Neuroscience, University
of North Texas Health Science Center, Fort Worth, Texas 76107, United States
| | - Su Yang
- Department
of Neurosurgery, The First Affiliated Hospital
of Wenzhou Medical University, Wenzhou 325000 China
- Zhejiang
Provincial Key Laboratory of Aging and Neurological Disorder Research, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000 China
| | - Qichuan Zhuge
- Department
of Neurosurgery, The First Affiliated Hospital
of Wenzhou Medical University, Wenzhou 325000 China
- Zhejiang
Provincial Key Laboratory of Aging and Neurological Disorder Research, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000 China
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5
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Sharma C, Osmolovskiy A, Singh R. Microbial Fibrinolytic Enzymes as Anti-Thrombotics: Production, Characterisation and Prodigious Biopharmaceutical Applications. Pharmaceutics 2021; 13:1880. [PMID: 34834294 PMCID: PMC8625737 DOI: 10.3390/pharmaceutics13111880] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/23/2021] [Accepted: 10/29/2021] [Indexed: 12/19/2022] Open
Abstract
Cardiac disorders such as acute myocardial infarction, embolism and stroke are primarily attributed to excessive fibrin accumulation in the blood vessels, usually consequential in thrombosis. Numerous methodologies including the use of anti-coagulants, anti-platelet drugs, surgical operations and fibrinolytic enzymes are employed for the dissolution of fibrin clots and hence ameliorate thrombosis. Microbial fibrinolytic enzymes have attracted much more attention in the management of cardiovascular disorders than typical anti-thrombotic strategies because of the undesirable after-effects and high expense of the latter. Fibrinolytic enzymes such as plasminogen activators and plasmin-like proteins hydrolyse thrombi with high efficacy with no significant after-effects and can be cost effectively produced on a large scale with a short generation time. However, the hunt for novel fibrinolytic enzymes necessitates complex purification stages, physiochemical and structural-functional attributes, which provide an insight into their mechanism of action. Besides, strain improvement and molecular technologies such as cloning, overexpression and the construction of genetically modified strains for the enhanced production of fibrinolytic enzymes significantly improve their thrombolytic potential. In addition, the unconventional applicability of some fibrinolytic enzymes paves their way for protein hydrolysis in addition to fibrin/thrombi, blood pressure regulation, anti-microbials, detergent additives for blood stain removal, preventing dental caries, anti-inflammatory and mucolytic expectorant agents. Therefore, this review article encompasses the production, biochemical/structure-function properties, thrombolytic potential and other surplus applications of microbial fibrinolytic enzymes.
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Affiliation(s)
- Chhavi Sharma
- Amity Institute of Microbial Technology, Amity University Uttar Pradesh, Noida 201313, India;
| | - Alexander Osmolovskiy
- Department of Microbiology, Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Rajni Singh
- Amity Institute of Microbial Technology, Amity University Uttar Pradesh, Noida 201313, India;
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6
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Zhu Y, Han HH, Zhai L, Yan Y, Liu X, Wang Y, Lei L, Wang JC. Engineering a "three-in-one" hirudin prodrug to reduce bleeding risk: A proof-of-concept study. J Control Release 2021; 338:462-471. [PMID: 34481024 DOI: 10.1016/j.jconrel.2021.08.058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 08/11/2021] [Accepted: 08/30/2021] [Indexed: 11/16/2022]
Abstract
An ideal anticoagulant should have at least three properties including targeted delivery to the thrombosis site, local activation or releasing to centralize the anti-thrombosis effects and thus reduce the bleeding risks, and long persistence in circulation to avoid repeated administration. In the present study, we sought to test a "three-in-one" strategy to design new protein anticoagulants. Based on these criteria, we constructed two hirudin prodrugs, R824-HV-ABD and ABD-HV-R824. The R824 peptide can bind phosphatidylserine on the surface of the procoagulant platelets and thus guide the prodrug to the thrombosis sites; albumin-binding domain (ABDs) can bind the prodrug to albumin, and thereby increase its persistence in circulation; the hirudin (HV) core in the prodrug is flanked by factor Xa recognition sites, thus factor Xa at the thrombosis site can cleave the fusion proteins and release the activated hirudin locally. Hirudin prodrugs were able to bind with procoagulant platelets and human serum albumin in vitro with high affinity, targeted concentrated and prevented the formation of occlusive thrombi in rat carotid artery injury model. Their effective time was significantly extended compared to native hirudin, and R824-HV-ABD showed a significantly improved half-life of about 24 h in rats. The bleeding time of prodrug-treated mice was much shorter than that of hirudin-treated mice. The results from the proof-of-concept studies, for the first time, demonstrate that "three-in-one" prodrug strategy may be a good solution for protein or peptide anticoagulants to reduce their bleeding risks.
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Affiliation(s)
- Yuanjun Zhu
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China; Department of Molecular and Cellular Pharmacology, School of Pharmaceutical Sciences, Peking University, Beijing, China.
| | - Hu-Hu Han
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Lin Zhai
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Yi Yan
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Xiaoyan Liu
- Department of Molecular and Cellular Pharmacology, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Yinye Wang
- Department of Molecular and Cellular Pharmacology, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Liandi Lei
- Peking University Medical and Health Analysis Center, China
| | - Jian-Cheng Wang
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China; Laboratory of innovative formulations and pharmaceutical excipients, Ningbo Institute of Marine Medicine, Peking University, Beijing, China.
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7
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Belcher A, Zulfiker AHM, Li OQ, Yue H, Gupta AS, Li W. Targeting Thymidine Phosphorylase With Tipiracil Hydrochloride Attenuates Thrombosis Without Increasing Risk of Bleeding in Mice. Arterioscler Thromb Vasc Biol 2021; 41:668-682. [PMID: 33297751 PMCID: PMC8105268 DOI: 10.1161/atvbaha.120.315109] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Current antiplatelet medications increase the risk of bleeding, which leads to a clear clinical need in developing novel mechanism-based antiplatelet drugs. TYMP (Thymidine phosphorylase), a cytoplasm protein that is highly expressed in platelets, facilitates multiple agonist-induced platelet activation, and enhances thrombosis. Tipiracil hydrochloride (TPI), a selective TYMP inhibitor, has been approved by the Food and Drug Administration for clinical use. We tested the hypothesis that TPI is a safe antithrombotic medication. Approach and Results: By coexpression of TYMP and Lyn, GST (glutathione S-transferase) tagged Lyn-SH3 domain or Lyn-SH2 domain, we showed the direct evidence that TYMP binds to Lyn through both SH3 and SH2 domains, and TPI diminished the binding. TYMP deficiency significantly inhibits thrombosis in vivo in both sexes. Pretreatment of platelets with TPI rapidly inhibited collagen- and ADP-induced platelet aggregation. Under either normal or hyperlipidemic conditions, treating wild-type mice with TPI via intraperitoneal injection, intravenous injection, or gavage feeding dramatically inhibited thrombosis without inducing significant bleeding. Even at high doses, TPI has a lower bleeding side effect compared with aspirin and clopidogrel. Intravenous delivery of TPI alone or combined with tissue plasminogen activator dramatically inhibited thrombosis. Dual administration of a very low dose of aspirin and TPI, which had no antithrombotic effects when used alone, significantly inhibited thrombosis without disturbing hemostasis. CONCLUSIONS This study demonstrated that inhibition of TYMP, a cytoplasmic protein, attenuated multiple signaling pathways that mediate platelet activation, aggregation, and thrombosis. TPI can be used as a novel antithrombotic medication without the increase in risk of bleeding.
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Affiliation(s)
- Adam Belcher
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine of Marshall University, Huntington, WV, 25755, USA
| | - Abu Hasanat Md Zulfiker
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine of Marshall University, Huntington, WV, 25755, USA
| | - Oliver Qiyue Li
- Marshall Institute for Interdisciplinary Research; Huntington, WV, 25701, USA
| | - Hong Yue
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine of Marshall University, Huntington, WV, 25755, USA
| | - Anirban Sen Gupta
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland OH 44106, USA
| | - Wei Li
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine of Marshall University, Huntington, WV, 25755, USA
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Intravital Assessment of Blood Platelet Function. A Review of the Methodological Approaches with Examples of Studies of Selected Aspects of Blood Platelet Function. Int J Mol Sci 2020; 21:ijms21218334. [PMID: 33172065 PMCID: PMC7664321 DOI: 10.3390/ijms21218334] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 10/23/2020] [Accepted: 11/04/2020] [Indexed: 01/14/2023] Open
Abstract
Platelet biology owes to intravital studies not only a better understanding of platelets’ role in primary hemostasis but also findings that platelets are important factors in inflammation and atherosclerosis. Researchers who enter the field of intravital platelet studies may be confused by the heterogeneity of experimental protocols utilized. On the one hand, there are a variety of stimuli used to activate platelet response, and on the other hand there are several approaches to measure the outcome of the activation. A number of possible combinations of activation factors with measurement approaches result in the aforementioned heterogeneity. The aim of this review is to present the most often used protocols in a systematic way depending on the stimulus used to activate platelets. By providing examples of studies performed with each of the protocols, we attempt to explain why a particular combination of stimuli and measurement method was applied to study a given aspect of platelet biology.
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9
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Jafarihaghighi F, Ardjmand M, Mirzadeh A, Hassani MS, Parizi SS. Current challenges and future trends in manufacturing small diameter artificial vascular grafts in bioreactors. Cell Tissue Bank 2020; 21:377-403. [PMID: 32415569 DOI: 10.1007/s10561-020-09837-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Accepted: 05/09/2020] [Indexed: 01/17/2023]
Abstract
Cardiovascular diseases are a leading cause of death. Vascular surgery is mainly used to solve this problem. However, the generation of a functional and suitable substitute for small diameter (< 6 mm) displacement is challengeable. Moreover, synthetic prostheses, made of polyethylene terephthalate and extended polytetrafluoroethylene show have shown insufficient performance. Therefore, the challenges dominating the use of autografts have prevented their efficient use. Tissue engineering is highlighted in regenerative medicine perhaps in aiming to address the issue of end-stage organ failure. While organs and complex tissues require the vascular supply to support the graft survival and render the bioartificial organ role, vascular tissue engineering has shown to be a hopeful method for cell implantation by the production of tissues in vitro. Bioreactors are a salient point in vascular tissue engineering due to the capability for reproducible and controlled variations showing a new horizon in blood vessel substitution. This review strives to display the overview of current concepts in the development of small-diameter by using bioreactors. In this work, we show a critical look at different factors for developing small-diameter and give suggestions for future studies.
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Affiliation(s)
- Farid Jafarihaghighi
- Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Mehdi Ardjmand
- Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran.
| | - Abolfazl Mirzadeh
- Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, VIC, 3052, Australia
| | - Mohammad Salar Hassani
- Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Shahriar Salemi Parizi
- Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
- Young Researchers and Elite Club, South Tehran Branch, Islamic Azad University, Tehran, Iran
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10
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New approaches for the assessment of platelet activation status in thrombus under flow condition using confocal microscopy. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2019; 393:727-738. [PMID: 31834466 DOI: 10.1007/s00210-019-01789-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 12/03/2019] [Indexed: 10/25/2022]
Abstract
The goal of the study was the assessment of heterogeneous platelet activation status in thrombus. In a ferric(III) chloride (FeCl3) thrombosis (intravital) model of C57BL/6 J mice, the area of irreversibly activated (phosphatidylserine (PS)-positive) platelets was assessed after 1-s exposure of a vessel to FeCl3. In a laser-induced thrombosis (intravital) model of GFP mice, the area of the thrombus composed of PS-negative platelets was evaluated. The ratio of the area of PECAM-1 to the area of the thrombus was used as a marker to assess the activity of PS-negative platelets. In the in vitro flow chamber model, the thrombus area (PS-negative and PS-positive platelets) and the platelet activation index (ratio of the area of PS-positive platelets to the area of thrombus) were determined. To assess platelet activation status with these models, acetylsalicylic acid (ASA) and iloprost (Ilo) were used. In the FeCl3 thrombosis, ASA (10 mg/kg, 100 mg/kg) decreased the area of PS-positive platelets. In the laser thrombosis, ASA (10 mg/kg) decreased the thrombus area, but the decrease in platelet activity was evident even at 3 mg/kg by an increased PECAM-1/thrombus ratio. In the flow chamber, ASA (0.02 mg/ml, 0.2 mg/ml) equally decreased the platelet activation index, whereas only at 0.2 mg/ml, it decreased the thrombus area. Ilo (3.6 ng/ml, 36 ng/ml) decreased the thrombus area but at 36 ng/ml increased the platelet activation index. We showed that intravital models and flow chamber provide a detailed assessment of platelet activation status and the mechanism of drug action.
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11
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Abstract
The ferric chloride models of arterial thrombosis are useful tools with which to investigate the cellular and molecular mechanisms that contribute to arterial thrombosis. Recent insights have, however, revealed the complex and multifaceted mechanism by which ferric chloride induces thrombus formation. Here, we discuss the strengths and weaknesses of the ferric chloride models of arterial thrombosis. Particular focus is given to the phenotypes of different knockout mice in the ferric chloride models and how these compare to other models with independent modes of initiation. Further, we discuss the relevance of the ferric chloride models to the human pathology of atherothrombotic disease.
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Affiliation(s)
- Steven P Grover
- UNC Blood Research Center, Division of Hematology and Oncology, Department of Medicine, University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
| | - Nigel Mackman
- UNC Blood Research Center, Division of Hematology and Oncology, Department of Medicine, University of North Carolina at Chapel Hill , Chapel Hill, NC, USA
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12
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Kasimu R, Wang X, Wang X, Hu J, Wang X, Mu Y. Antithrombotic effects and related mechanisms of Salvia deserta Schang root EtOAc extracts. Sci Rep 2018; 8:17753. [PMID: 30532017 PMCID: PMC6288089 DOI: 10.1038/s41598-018-36026-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 08/01/2018] [Indexed: 12/16/2022] Open
Abstract
Salvia deserta Schang (SDS) belongs to the same family as Salvia miltiorrhiza bunge, one of the antithrombotic Chinese herbal medicines. In our study, EtOAc root extracts were analyzed for their effects on adenosine diphosphate (ADP)-induced platelet aggregation in rabbits and FeCl3-induced rat common carotid artery thrombosis as well as on rat blood plasma concentrations of thromboxane B2 (TXB2), 6-keto-prostaglandin F1 alpha (6-keto-PGF1α), antithrombin-III (AT-III), protein C (PC), plasminogen (PLG), plasminogen activator inhibitor (PAI-1), von Willebrand factor (vWF) and tissue-type plasminogen activator (t-PA). EtOAc extracts from SDS roots had significant inhibitory effects on ADP-induced maximum platelet aggregation rate (10.2 ± 2.6 vs control 35.7 ± 5.2; P < 0.05), reduced the FeCl3-induced rat common carotid artery thrombus weight and thrombus area ratio (P < 0.05), significantly decreased plasma TXB2, vWF and PAI-1 levels and increased 6-keto-PGF1α and t-PA levels in a dose dependent manner (all P < 0.05). Thus, the ratio of TXB2/6-keto-PGF1α was significantly decreased (P < 0.05), while the ratio of t-PA/PAI-1 was significantly increased (P < 0.05). In addition, enhanced AT-III and PC activities indicated coagulation inactivation effects of EtOAc SDS root extracts. EtOAc extraction from SDS showed antithrombotic effects, which are likely due to platelet adhesion and aggregation inhibition as well as anticoagulant activities.
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Affiliation(s)
- Rena Kasimu
- College of Pharmacy, Xinjiang Medical University, No. 393 Xinyi Road, Urumqi, 830011, China
| | - Xinling Wang
- College of Pharmacy, Xinjiang Medical University, No. 393 Xinyi Road, Urumqi, 830011, China.
| | - Xiaomei Wang
- College of Pharmacy, Xinjiang Medical University, No. 393 Xinyi Road, Urumqi, 830011, China
| | - Junping Hu
- College of Pharmacy, Xinjiang Medical University, No. 393 Xinyi Road, Urumqi, 830011, China
| | - Xiaoqing Wang
- College of Pharmacy, Xinjiang Medical University, No. 393 Xinyi Road, Urumqi, 830011, China
| | - Yuming Mu
- The First Affiliated Hospital Of Xinjiang Medical University, No. 137 South Liyushan Road, Urumqi, 830054, China
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Chen X, Tao T, Wang H, Zhao H, Lu L, Wu F. Arterial Thrombosis Is Accompanied by Elevated Mitogen-Activated Protein Kinase (MAPK) and Cyclooxygenase-2 (COX-2) Expression via Toll-Like Receptor 4 (TLR-4) Activation by S100A8/A9. Med Sci Monit 2018; 24:7673-7681. [PMID: 30367682 PMCID: PMC6216442 DOI: 10.12659/msm.909641] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND The aim of this study was to determine the involvement of S100A8/A9 in the development of arterial thrombosis. MATERIAL AND METHODS A total of 303 patients were enrolled in this study, with 110 having acute coronary syndrome (ACS) and 110 having coronary heart disease (CHD), and 83 subjects served as healthy blood donors. The concentrations of Toll-like receptor 4 (TLR-4), cyclooxygenase-2 (COX-2), and S100A8/A9 protein were determined in the sera of the participants and in peripheral blood mononuclear cells (PBMCs) derived from a rat carotid artery thrombosis model and in human aortic endothelial cells (HAECs). The mitogen-activated protein kinase (MAPK) inhibitor SB203580 and the TLR-4 blocker CLI-095 were used to investigate the role of the TLR-4-MAPK-COX2 signaling axis in thrombosis. RESULTS The levels of COX-2, TLR-4, and S100A8/A9 in the sera of patients with ACS and CHD were significantly higher than in healthy controls (P<0.05). S100A8/A9 expression was significantly correlated with TLR-4 and COX-2 in the ACS group and with TLR-4 in the CHD group. In the rat carotid thrombosis model, the expressions of TLR-4, COX-2, and p-p38 MAPK significantly increased until 14 days after thrombosis induction, whereas S100A8/A9 expression increased until day 7, but then decreased. Administration of SB203580 to rats reduced COX-2 expression in PBMCs after thrombosis induction, and incubation of HAECs with CLI-095 reduced their p-p38 MAPK and COX-2 response to S100A8/A9 stimulation. CONCLUSIONS S100A8/A9 is upregulated after blood vessel injury and is enhanced in combination with TLR-4 COX-2 induction via p38 MAPK activation.
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Affiliation(s)
- Xiaonan Chen
- Department of Geriatrics, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China (mainland)
| | - Ting Tao
- Department of Geriatrics, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China (mainland)
| | - Hongyan Wang
- Department of Geriatrics, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China (mainland)
| | - Hongyu Zhao
- Department of Geriatrics, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China (mainland)
| | - Lin Lu
- Institute of Cardiovascular Diseases, Shanghai Jiaotong University School of Medicine, Shanghai, China (mainland).,Department of Cardiology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China (mainland)
| | - Fang Wu
- Department of Geriatrics, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China (mainland)
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Methods available to assess therapeutic potential of fibrinolytic enzymes of microbial origin: a review. J Anal Sci Technol 2018. [DOI: 10.1186/s40543-018-0143-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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15
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Preventive effect of a novel diosgenin derivative on arterial and venous thrombosis in vivo. Bioorg Med Chem Lett 2016; 26:3364-3369. [DOI: 10.1016/j.bmcl.2016.05.032] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Revised: 04/30/2016] [Accepted: 05/11/2016] [Indexed: 12/31/2022]
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16
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Wickham LA, Sitko G, Stranieri-Michener M, Handt L, Basso A, Fried S, Chu L, Maderia M, Owens K, Castriota G, Chen Z, Metzger JM, Imbriglio J, Wang X, Cai TQ. Differential anti-thrombotic benefit and bleeding risk profiles of antagonists of protease-activated receptor 1 and 4 in Cynomolgus Macaques. Thromb Res 2016; 145:133-9. [PMID: 27318768 DOI: 10.1016/j.thromres.2016.06.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 05/24/2016] [Accepted: 06/08/2016] [Indexed: 11/30/2022]
Abstract
Platelet activation plays a crucial role in hemostasis and thrombosis. Thrombin, the most potent stimulus of platelet activation, mediates platelet activation via the protease activated receptors (PARs). The platelet PAR repertoire in mediating thrombin's action differs across species. Only nonhuman primate (NHP) platelet activation is known to be similar to humans, mediated by PAR1 and PAR4, hence limiting translational in vivo studies of PAR's role in thrombosis and hemostasis to NHPs. Earlier studies have demonstrated a range of distinct in vitro activities of PAR1 and 4 in platelet activation yet the implications of these events in vivo is unclear. The objective of this study is to investigate and compare the roles of PAR1 and PAR4 in hemostasis and thrombosis in a relevant animal species. NHP models for pharmacokinetic, ex vivo platelet aggregation responses, FeCI3 injury-mediated arterial thrombosis and template bleeding were developed in Cynomolgus Macaques. Potent and selective small molecule antagonists of PAR1 and PAR4 were characterized in an array of in vitro assays, and subsequently examined head-to-head in the NHP models. Treatment of NHPs with antagonists of PAR1 or PAR4 both resulted in strong inhibition of ex vivo platelet aggregation. At doses that led to similar inhibition of platelet aggregation, animals treated with the PAR4 antagonist showed similar levels of anti-thrombotic efficacy, but longer bleeding times, compared to animals treated with the PAR1 antagonist. These findings suggest that PAR1 antagonism will likely produce a larger therapeutic index (ie. a larger anti-thrombotic efficacy over bleeding risk margin) than PAR4 antagonism.
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Affiliation(s)
- L Alexandra Wickham
- Department of In Vivo Pharmacology, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Gary Sitko
- Department of Safety, Merck Research Laboratories, Kenilworth, NJ, USA
| | | | - Larry Handt
- Department of Safety, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Andrea Basso
- Department of In Vitro Pharmacology, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Steven Fried
- Department of In Vitro Pharmacology, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Lin Chu
- Department of Formulation, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Maria Maderia
- Department of Drug Metabolism, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Karen Owens
- Department of Drug Metabolism, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Gino Castriota
- Department of Cardiometabolic Diseases, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Zhu Chen
- Department of Cardiometabolic Diseases, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Joseph M Metzger
- Department of In Vivo Pharmacology, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Jason Imbriglio
- Department of Medicinal Chemistry, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Xinkang Wang
- Department of Cardiometabolic Diseases, Merck Research Laboratories, Kenilworth, NJ, USA
| | - Tian-Quan Cai
- Department of In Vivo Pharmacology, Merck Research Laboratories, Kenilworth, NJ, USA.
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Vancraeyneste H, Charlet R, Guerardel Y, Choteau L, Bauters A, Tardivel M, François N, Dubuquoy L, Soloviev D, Poulain D, Sendid B, Jawhara S. Short fungal fractions of β-1,3 glucans affect platelet activation. Am J Physiol Heart Circ Physiol 2016; 311:H725-34. [PMID: 27288438 DOI: 10.1152/ajpheart.00907.2015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 05/12/2016] [Indexed: 02/08/2023]
Abstract
Platelets are capable of binding, aggregating, and internalizing microorganisms, which enhances the elimination of pathogens from the blood. The yeast Candida albicans is a pathobiont causing life-threatening invasive infections. Its cell wall contains β-1,3 glucans that are known to trigger a wide range of host cell activities and to circulate during infection. We studied the effect of β-1,3 glucan fractions (BGFs) consisting of diglucosides (Glc2), tetraglucosides (Glc4), and pentaglucosides (Glc5) on human platelets, their mechanisms of action, and their possible impact on host defenses. The effect of BGFs on the coagulation process was determined by measuring thrombin generation. Platelets pretreated with BGFs were analyzed in terms of activation, receptor expression, aggregation, and adhesion to neutrophils and to C. albicans The results show that BGFs affected the endogenous thrombin potential in a concentration-dependent manner. For platelet activation, BGFs at a low concentration (2 μmol/l) reduced ATP release and prevented the phosphorylation of protein kinase C. BGFs diminished the expression of P-selectin and the activation of αIIbβ3 BGFs decreased platelet aggregation and the interaction between thrombin-stimulated platelets and neutrophils, fibrinogen, and C. albicans GLc5 decreased ATP release and TGF-β1 production in response to TLR4 upregulation in thrombin-stimulated platelets, but TLR4 blockage abolished the effect of BGFs on platelets. This study provides evidence that fungal pentaglucosides modulate platelet activity mediated via TLR4 stimulation and reduce platelet-neutrophil interaction.
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Affiliation(s)
- Hélène Vancraeyneste
- Univ Lille Nord de France, Lille, France; UDSL, Lille, France; INSERM U995, Lille, France; CHRU Lille, Lille, France
| | - Rogatien Charlet
- Univ Lille Nord de France, Lille, France; UDSL, Lille, France; INSERM U995, Lille, France; CHRU Lille, Lille, France
| | - Yann Guerardel
- Université de Lille 1, Unité de Glycobiologie Structurale et Fonctionnelle, UGSF, Villeneuve d'Ascq, France; CNRS, UMR 8576, Villeneuve d'Ascq, France
| | - Laura Choteau
- Univ Lille Nord de France, Lille, France; UDSL, Lille, France; INSERM U995, Lille, France; CHRU Lille, Lille, France
| | - Anne Bauters
- Laboratoire d'Hémostase, Pôle de Pathologie Génétique, Lille, France
| | - Meryem Tardivel
- Plateforme d'Interaction Moléculaire, IMPRT-IFR114, Faculté de Médecine de Lille, Lille, France
| | - Nadine François
- Service de Parasitologie Mycologie, Pole de Biologie Pathologie Génétique, Lille, France; and
| | - Laurent Dubuquoy
- Univ Lille Nord de France, Lille, France; UDSL, Lille, France; INSERM U995, Lille, France; CHRU Lille, Lille, France
| | - Dmitry Soloviev
- Department of Molecular Cardiology, Joseph J. Jacobs Center for Thrombosis and Vascular Biology, Cleveland Clinic, Cleveland, Ohio
| | - Daniel Poulain
- Univ Lille Nord de France, Lille, France; UDSL, Lille, France; INSERM U995, Lille, France; CHRU Lille, Lille, France; Service de Parasitologie Mycologie, Pole de Biologie Pathologie Génétique, Lille, France; and
| | - Boualem Sendid
- Univ Lille Nord de France, Lille, France; UDSL, Lille, France; INSERM U995, Lille, France; CHRU Lille, Lille, France; Service de Parasitologie Mycologie, Pole de Biologie Pathologie Génétique, Lille, France; and
| | - Samir Jawhara
- Univ Lille Nord de France, Lille, France; UDSL, Lille, France; INSERM U995, Lille, France; CHRU Lille, Lille, France;
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18
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Honda Y, Kamisato C, Morishima Y. Prevention of arterial thrombosis by edoxaban, an oral factor Xa inhibitor in rats: monotherapy and in combination with antiplatelet agents. Eur J Pharmacol 2016; 786:246-252. [PMID: 27288116 DOI: 10.1016/j.ejphar.2016.06.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 06/06/2016] [Accepted: 06/06/2016] [Indexed: 10/21/2022]
Abstract
In addition to platelet aggregation, coagulation activation is considered to be involved in arterial thrombosis. In this study, we determined antithrombotic effects of edoxaban, an oral factor Xa (FXa) inhibitor, as both a monotherapy and in combination with antiplatelet agents in a rat model of arterial thrombosis. We further examined its effects on a procoagulant biomarker and bleeding. Arterial thrombosis was induced by topical application of 15% ferric chloride to rat abdominal aortas. Bleeding time was measured by a tail incision method. Edoxaban, clopidogrel, and aspirin were orally administered 30min, 4h, and 2h before thrombus or bleeding induction. As a biomarker of coagulation activation, plasma thrombin-antithrombin complex (TAT) was measured. Edoxaban dose-dependently prevented arterial thrombosis in a manner comparable to clopidogrel and aspirin. The combination of edoxaban plus clopidogrel or edoxaban plus aspirin significantly potentiated the antithrombotic effects compared with these drugs alone. The combination of edoxaban and clopidogrel was more potent than clopidogrel and aspirin. Plasma TAT concentration was elevated after thrombus induction and suppressed by edoxaban and clopidogrel, but not by aspirin, suggesting P2Y12 receptor-mediated platelet procoagulant activity. Bleeding time was prolonged by the coadministration of edoxaban and clopidogrel, but not by edoxaban and aspirin. In conclusion, the present study demonstrates that the monotherapy with edoxaban and combination therapy with edoxaban plus clopidogrel or edoxaban plus aspirin are promising options for the prevention of arterial thrombosis as effective as the standard antiplatelet agents; however, a combination of edoxaban and clopidogrel increased the risk of bleeding.
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Affiliation(s)
- Yuko Honda
- Biological Research Laboratories, R & D Division, Daiichi Sankyo Co., Ltd, Tokyo, Japan
| | - Chikako Kamisato
- Biological Research Laboratories, R & D Division, Daiichi Sankyo Co., Ltd, Tokyo, Japan
| | - Yoshiyuki Morishima
- Biological Research Laboratories, R & D Division, Daiichi Sankyo Co., Ltd, Tokyo, Japan.
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A Novel Model of Intravital Platelet Imaging Using CD41-ZsGreen1 Transgenic Rats. PLoS One 2016; 11:e0154661. [PMID: 27128503 PMCID: PMC4851362 DOI: 10.1371/journal.pone.0154661] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 04/15/2016] [Indexed: 01/08/2023] Open
Abstract
Platelets play pivotal roles in both hemostasis and thrombosis. Although models of intravital platelet imaging are available for thrombosis studies in mice, few are available for rat studies. The present effort aimed to generate fluorescent platelets in rats and assess their dynamics in a rat model of arterial injury. We generated CD41-ZsGreen1 transgenic rats, in which green fluorescence protein ZsGreen1 was expressed specifically in megakaryocytes and thus platelets. The transgenic rats exhibited normal hematological and biochemical values with the exception of body weight and erythroid parameters, which were slightly lower than those of wild-type rats. Platelet aggregation, induced by 20 μM ADP and 10 μg/ml collagen, and blood clotting times were not significantly different between transgenic and wild-type rats. Saphenous arteries of transgenic rats were injured with 10% FeCl3, and the formation of fluorescent thrombi was evaluated using confocal microscopy. FeCl3 caused time-dependent increases in the mean fluorescence intensity of injured arteries of vehicle-treated rats. Prasugrel (3 mg/kg, p.o.), administered 2 h before FeCl3, significantly inhibited fluorescence compared with vehicle-treated rats (4.5 ± 0.4 vs. 14.9 ± 2.4 arbitrary fluorescence units at 30 min, respectively, n = 8, P = 0.0037). These data indicate that CD41-ZsGreen1 transgenic rats represent a useful model for intravital imaging of platelet-mediated thrombus formation and the evaluation of antithrombotic agents.
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20
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Singh V, Jain M, Misra A, Khanna V, Prakash P, Malasoni R, Dwivedi AK, Dikshit M, Barthwal MK. Curcuma oil ameliorates insulin resistance & associated thrombotic complications in hamster & rat. Indian J Med Res 2016. [PMID: 26205026 PMCID: PMC4525408 DOI: 10.4103/0971-5916.160719] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Background & objectives: Curcuma oil (C. oil) isolated from turmeric (Curcuma longa L.) has been shown to have neuro-protective, anti-cancer, antioxidant and anti-hyperlipidaemic effects in experimental animal models. However, its effect in insulin resistant animals remains unclear. The present study was carried out to investigate the disease modifying potential and underlying mechanisms of the C. oil in animal models of diet induced insulin resistance and associated thrombotic complications. Methods: Male Golden Syrian hamsters on high fructose diet (HFr) for 12 wk were treated orally with vehicle, fenofibrate (30 mg/kg) or C. oil (300 mg/kg) in the last four weeks. Wistar rats fed HFr for 12 wk were treated orally with C. oil (300 mg/kg) in the last two weeks. To examine the protective effect of C. oil, blood glucose, serum insulin, platelet aggregation, thrombosis and inflammatory markers were assessed in these animals. Results: Animals fed with HFr diet for 12 wk demonstrated hyperlipidaemia, hyperglycaemia, hyperinsulinaemia, alteration in insulin sensitivity indices, increased lipid peroxidation, inflammation, endothelial dysfunction, platelet free radical generation, tyrosine phosphorylation, aggregation, adhesion and intravascular thrombosis. Curcuma oil treatment for the last four weeks in hamsters ameliorated HFr-induced hyperlipidaemia, hyperglycaemia, insulin resistance, oxidative stress, inflammation, endothelial dysfunction, platelet activation, and thrombosis. In HFr fed hamsters, the effect of C. oil at 300 mg/kg was comparable with the standard drug fenofibrate. Curcuma oil treatment in the last two weeks in rats ameliorated HFr-induced hyperglycaemia and hyperinsulinaemia by modulating hepatic expression of sterol regulatory element binding protein 1c (SREBP-1c), peroxisome proliferator-activated receptor-gamma co-activator 1 (PGC-1)α and PGC-1β genes known to be involved in lipid and glucose metabolism. Interpretation & conclusions: High fructose feeding to rats and hamsters led to the development of insulin resistance, hyperglycaemia, endothelial dysfunction and oxidative stress. C. oil prevented development of thrombotic complications associated with insulin resistance perhaps by modulating genes involved in lipid and glucose metabolism. Further studies are required to confirm these findings.
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21
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Tomkins AJ, Hood RJ, Pepperall D, Null CL, Levi CR, Spratt NJ. Thrombolytic Recanalization of Carotid Arteries Is Highly Dependent on Degree of Stenosis, Despite Sonothrombolysis. J Am Heart Assoc 2016; 5:JAHA.115.002716. [PMID: 26908405 PMCID: PMC4802445 DOI: 10.1161/jaha.115.002716] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Stroke associated with acute carotid occlusion is associated with poor effectiveness of tissue plasminogen activator (tPA) thrombolysis and poor prognosis. Rupture of atherosclerotic plaques resulting in vascular occlusions may occur on plaques, causing variable stenosis. We hypothesized that degree of stenosis may affect recanalization rates with tPA. Ultrasound+tPA (sonothrombolysis) has been shown to improve recanalization for intracranial occlusions but has not been tested for carotid occlusion. Our primary aim was to determine thrombolytic recanalization rates in a model of occlusion with variable stenosis, with a secondary aim to investigate sonothrombolysis in this model. METHODS AND RESULTS Rat carotid arteries were crushed and focal stenosis created (25% baseline Doppler flow) with a silk-suture tie invoking thrombosis and occlusion. To model mild or severe stenosis, the tie was released pretreatment or left in place. Animals were treated with tPA (10 mg/kg) or tPA+ultrasound (2-MHz) in each stenosis model (n=7/group). Recanalization was assessed by Doppler flow. Thrombolytic recanalization rates were significantly higher in mild stenosis groups (71% versus 0% with severe stenosis; P<0.0001). Recanalization rates were not significantly higher with additional ultrasound in either model. CONCLUSIONS In this model, the degree of carotid stenosis had a large effect on thrombolytic recanalization. Sonothrombolysis using standard parameters for intracranial sonothrombolysis did not increase recanalization. Further testing is warranted. The degree of underlying stenosis may be an important predictor of thrombolytic recanalization, and clinical correlation of these findings may provide new approaches to treatment selection for patients with carotid occlusion.
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Affiliation(s)
- Amelia J Tomkins
- School of Biomedical Sciences & Pharmacy, University of Newcastle, Callaghan, NSW, Australia Hunter Medical Research Institute, New Lambton, NSW, Australia
| | - Rebecca J Hood
- School of Biomedical Sciences & Pharmacy, University of Newcastle, Callaghan, NSW, Australia Hunter Medical Research Institute, New Lambton, NSW, Australia
| | - Debbie Pepperall
- School of Biomedical Sciences & Pharmacy, University of Newcastle, Callaghan, NSW, Australia Hunter Medical Research Institute, New Lambton, NSW, Australia
| | | | - Christopher R Levi
- School of Medicine and Public Health, University of Newcastle, Callaghan, NSW, Australia Hunter Medical Research Institute, New Lambton, NSW, Australia Hunter New England Local Health District Newcastle, Newcastle, NSW, Australia
| | - Neil J Spratt
- School of Biomedical Sciences & Pharmacy, University of Newcastle, Callaghan, NSW, Australia Hunter Medical Research Institute, New Lambton, NSW, Australia Hunter New England Local Health District Newcastle, Newcastle, NSW, Australia
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Synthesis and evaluation of dual antiplatelet activity of bispidine derivatives of N-substituted pyroglutamic acids. Eur J Med Chem 2016; 110:1-12. [PMID: 26807542 DOI: 10.1016/j.ejmech.2016.01.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 01/12/2016] [Accepted: 01/13/2016] [Indexed: 11/23/2022]
Abstract
N-aralkylpyroglutamides of substituted bispidine were prepared and evaluated for their ability to inhibit collagen induced platelet aggregation, both in vivo and in vitro. Some compounds showed high anti-platelet efficacy (in vitro) of which six inhibited both collagen as well as U46619 induced platelet aggregation with concentration dependent anti-platelet efficacy through dual mechanism. In particular, the compound 4j offered significant protection against collagen epinephrine induced pulmonary thromboembolism as well as ferric chloride induced arterial thrombosis, without affecting bleeding tendency in mice. Therefore, the present study suggests that the compound 4j displays a remarkable antithrombotic efficacy much better than aspirin and clopidogrel.
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Tripeptide SQL Inhibits Platelet Aggregation and Thrombus Formation by Affecting PI3K/Akt Signaling. J Cardiovasc Pharmacol 2015; 66:254-60. [DOI: 10.1097/fjc.0000000000000269] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Souza RO, Assreuy AM, Madeira JC, Chagas FD, Parreiras LA, Santos GR, Mourão PA, Pereira MG. Purified polysaccharides of Geoffroea spinosa barks have anticoagulant and antithrombotic activities devoid of hemorrhagic risks. Carbohydr Polym 2015; 124:208-15. [DOI: 10.1016/j.carbpol.2015.01.069] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 10/06/2014] [Accepted: 01/28/2015] [Indexed: 10/24/2022]
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Resolving the multifaceted mechanisms of the ferric chloride thrombosis model using an interdisciplinary microfluidic approach. Blood 2015; 126:817-24. [PMID: 25931587 DOI: 10.1182/blood-2015-02-628594] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 04/24/2015] [Indexed: 11/20/2022] Open
Abstract
The mechanism of action of the widely used in vivo ferric chloride (FeCl3) thrombosis model remains poorly understood; although endothelial cell denudation is historically cited, a recent study refutes this and implicates a role for erythrocytes. Given the complexity of the in vivo environment, an in vitro reductionist approach is required to systematically isolate and analyze the biochemical, mass transfer, and biological phenomena that govern the system. To this end, we designed an "endothelial-ized" microfluidic device to introduce controlled FeCl3 concentrations to the molecular and cellular components of blood and vasculature. FeCl3 induces aggregation of all plasma proteins and blood cells, independent of endothelial cells, by colloidal chemistry principles: initial aggregation is due to binding of negatively charged blood components to positively charged iron, independent of biological receptor/ligand interactions. Full occlusion of the microchannel proceeds by conventional pathways, and can be attenuated by antithrombotic agents and loss-of-function proteins (as in IL4-R/Iba mice). As elevated FeCl3 concentrations overcome protective effects, the overlap between charge-based aggregation and clotting is a function of mass transfer. Our physiologically relevant in vitro system allows us to discern the multifaceted mechanism of FeCl3-induced thrombosis, thereby reconciling literature findings and cautioning researchers in using the FeCl3 model.
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Shang J, Chen Z, Wang M, Li Q, Feng W, Wu Y, Wu W, Graziano MP, Chintala M. Zucker Diabetic Fatty rats exhibit hypercoagulability and accelerated thrombus formation in the Arterio-Venous shunt model of thrombosis. Thromb Res 2014; 134:433-9. [PMID: 24796819 DOI: 10.1016/j.thromres.2014.04.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 04/06/2014] [Accepted: 04/08/2014] [Indexed: 11/18/2022]
Abstract
INTRODUCTION Diabetes is a significant risk factor for thrombosis. The present study aimed at assessing coagulability, platelet reactivity, and thrombogenicity of the diabetic female Zucker Diabetic Fatty (ZDF) rat model and its relevance in studying antithrombotic mechanisms. MATERIALS AND METHODS The basal coagulant state in ZDF rats was evaluated by clotting times, thromboelastography, and thrombin generation assay. A 14-day treatment with dapagliflozin in ZDF rats was pursued to investigate if glycemic control can improve coagulability. Thrombus formation in the Arterio-Venous (A-V) shunt model and the FeCl3-induced arterial thrombosis model was studied, with the antithrombotic effect of apixaban in the former model further investigated. RESULTS ZDF rats exhibited significantly shortened clotting times, enhanced thrombin generation, and decreased fibrinolysis at baseline. Effective glycemic control achieved with dapagliflozin did not improve any of these parameters. ZDF rats displayed accelerated thrombus formation and were amenable to apixaban treatment in the A-V shunt model albeit with less sensitivity than normal rats. ZDF rats exhibited less platelet aggregation in response to ADP, collagen and PAR-4, and attenuated thrombotic response in the FeCl3 model. CONCLUSIONS ZDF rats are at a chronic hypercoagulable and hypofibrinolytic state yet with compromised platelet reactivity. They display accelerated and attenuated thrombosis in the A-V shunt and FeCl3 model of thrombosis, respectively. Results shed new light on the pathophysiology of the ZDF rat model and illustrate its potential value in translational research on anticoagulant agents in diabetics. Caution needs to be exerted in utilizing this model in assessing antiplatelet mechanisms in diabetes-associated atherothrombosis.
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Affiliation(s)
- Jin Shang
- Department of Cardiometabolic Disease, Merck Research Laboratories, Kenilworth, New Jersey.
| | - Zhu Chen
- Department of Cardiometabolic Disease, Merck Research Laboratories, Kenilworth, New Jersey.
| | - Min Wang
- Department of Cardiometabolic Disease, Merck Research Laboratories, Kenilworth, New Jersey
| | - Qiu Li
- Department of Cardiometabolic Disease, Merck Research Laboratories, Kenilworth, New Jersey
| | - Wen Feng
- Department of Cardiometabolic Disease, Merck Research Laboratories, Kenilworth, New Jersey
| | - Yangsong Wu
- Department of Cardiometabolic Disease, Merck Research Laboratories, Kenilworth, New Jersey
| | - Weizhen Wu
- Department of Cardiometabolic Disease, Merck Research Laboratories, Kenilworth, New Jersey
| | - Michael P Graziano
- Department of Cardiometabolic Disease, Merck Research Laboratories, Kenilworth, New Jersey
| | - Madhu Chintala
- Department of Cardiometabolic Disease, Merck Research Laboratories, Kenilworth, New Jersey
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Dias DPM, Canola PA, Teixeira LG, Bernardi NS, Gravena K, Sampaio RDCDL, Albernaz RM, Soares LMC, Bechara GH, Canola JC, Lacerda Neto JCD. A Reproducible Venous Thrombosis Model in Horses Induced by the Combination of an Endothelial Lesion and Blood Flow Stasis. J Equine Vet Sci 2014. [DOI: 10.1016/j.jevs.2013.09.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Prakash P, Singh V, Jain M, Rana M, Khanna V, Barthwal MK, Dikshit M. Silymarin ameliorates fructose induced insulin resistance syndrome by reducing de novo hepatic lipogenesis in the rat. Eur J Pharmacol 2014; 727:15-28. [DOI: 10.1016/j.ejphar.2014.01.038] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Revised: 01/14/2014] [Accepted: 01/22/2014] [Indexed: 02/07/2023]
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Chen C, Duan H, Gao C, Liu M, Wu X, Wei Y, Zhang X, Liu Z. Non-covalent modification of thrombolytic agent nattokinase: simultaneous improvement of fibrinolysis activity and enzymatic stability. RSC Adv 2014. [DOI: 10.1039/c4ra02626h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Folic acid modified chitosan (CS-FA) was synthesized and applied to modify Nattokinase (NK), a thrombolytic agent, for better fibrinolysis activity and stability. It provides great opportunities in curing cardiovascular disease (CVD), a leading cause of death globally.
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Affiliation(s)
- Chen Chen
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry
- Lanzhou University
- Lanzhou 730000, People's Republic of China
| | - Haogang Duan
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry
- Lanzhou University
- Lanzhou 730000, People's Republic of China
- The First Hospital
- Lanzhou University
| | - Chunmei Gao
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry
- Lanzhou University
- Lanzhou 730000, People's Republic of China
| | - Mingzhu Liu
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry
- Lanzhou University
- Lanzhou 730000, People's Republic of China
| | - Xin'an Wu
- The First Hospital
- Lanzhou University
- Lanzhou 730000, People's Republic of China
| | - Yuhui Wei
- The First Hospital
- Lanzhou University
- Lanzhou 730000, People's Republic of China
| | - Xinyu Zhang
- Department of Polymer and Fiber Engineering
- Auburn University
- Auburn, USA
| | - Zhen Liu
- The Department of Chemical and Biomolecular Engineering
- Johns Hopkins University
- Baltimore, USA
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Jain M, Surin WR, Misra A, Prakash P, Singh V, Khanna V, Kumar S, Siddiqui HH, Raj K, Barthwal MK, Dikshit M. Antithrombotic Activity of a Newly Synthesized Coumarin Derivative 3-(5-Hydroxy-2,2-dimethyl-chroman-6-yl)-N-{2-[3-(5-hydroxy-2,2-dimethyl-chroman-6-yl)-propionylamino]-ethyl}-propionamide. Chem Biol Drug Des 2013; 81:499-508. [DOI: 10.1111/cbdd.12000] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Couture L, Richer LP, Mercier M, Hélie C, Lehoux D, Hossain SM. Troubleshooting the rabbit ferric chloride-induced arterial model of thrombosis to assess in vivo efficacy of antithrombotic drugs. J Pharmacol Toxicol Methods 2012; 67:91-7. [PMID: 23231926 DOI: 10.1016/j.vascn.2012.11.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2012] [Revised: 11/07/2012] [Accepted: 11/30/2012] [Indexed: 10/27/2022]
Abstract
INTRODUCTION The FeCl3-induced arterial model of thrombosis is one of the most widely used animal models to assess arterial efficacy of new antithrombotic drug candidates. This model is well-established in rodents but in a less extent in the rabbit. In this work, we present a methodology for a rabbit FeCl3-induced arterial model of thrombosis derived from our troubleshooting which allows the generation of reliable efficacy data for new antithrombotic drug candidates. METHODS Rabbits were administered with heparin 4.5U/kg/min, argatroban 10μg/kg/min or saline by intravenous infusion. The blood flow was monitored using a Doppler flow probe. The time from the application of FeCl3 to the recorded zero blood flow was defined as the time to occlusion, with a maximum recording time of 60min post-FeCl3 application. After 30min of infusion, thrombosis was induced by wrapping a FeCl3-saturated filter paper around the carotid artery caudal to the flow probe. Animals were subject to exclusion criteria based on the visual aspect of the artery FeCl3-induced injury and based on changes in blood flow upon FeCl3 application. RESULTS Following the application of FeCl3, a mean time to occlusion for saline, heparin and argatroban of 24.3±1.8, 52.5±4.8 and 53.5±4.5min was obtained, respectively. Mean time to occlusion for heparin and argatroban administered groups was significantly different when compared to the saline-treated group (p<0.05). These results for the test compounds represent approximately 80% of the maximum possible prolongation. DISCUSSION The rabbit FeCl3-induced arterial model of thrombosis presented in this paper derived from our troubleshooting is sensitive and reproducible for the generation of accurate and reliable efficacy data in the assessment of new antithrombotic agents in preclinical drug development.
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Affiliation(s)
- L Couture
- National Research Council Canada, Montreal, Quebec, Canada H4P 2R2
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Chen C, Li SX, Wang SM, Liang SW. Investigation into the anti-thrombosis effect and contents of total saponins and flavonoids in the bioactive fraction of Naodesheng prescription. JOURNAL OF ETHNOPHARMACOLOGY 2012; 144:208-212. [PMID: 22982395 DOI: 10.1016/j.jep.2012.09.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 07/23/2012] [Accepted: 09/03/2012] [Indexed: 06/01/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Naodesheng prescription is a widely used traditional Chinese medicine (TCM), and mainly applied in clinics to treat cerebral arteriosclerosis, ischemic stroke, sequelae of cerebral hemorrhage etc. AIM OF THE STUDY The present study was designed to investigate the anti-thrombosis effects of this prescription, and to search its bioactive fraction. MATERIALS AND METHODS We evaluated the anti-thrombotic effects by measuring platelet aggregation in rats, and the clotting time and protection rate in mice. The contents of total saponins and flavonoids in the bioactive fraction were determined by UV-vis spectrophotometry. RESULTS The results showed that Naodesheng has significant anti-thrombotic and anticoagulation effects. The contents of total saponins and flavonoids in the bioactive fraction were 7.885% and 8.434%, respectively. CONCLUSIONS Such study will contribute to further exploration of Naodesheng in the therapy of thrombosis diseases and to its re-development based on the bioactive fraction and ingredients.
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Affiliation(s)
- Chao Chen
- School of Traditional Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou 510006, PR China.
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Peng H, Schlaich EM, Row S, Andreadis ST, Swartz DD. A novel ovine ex vivo arteriovenous shunt model to test vascular implantability. Cells Tissues Organs 2011; 195:108-21. [PMID: 22005667 DOI: 10.1159/000331415] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The major objective of successful development of tissue-engineered vascular grafts is long-term in vivo patency. Optimization of matrix, cell source, surface modifications, and physical preconditioning are all elements of attaining a compatible, durable, and functional vascular construct. In vitro model systems are inadequate to test elements of thrombogenicity and vascular dynamic functional properties while in vivo implantation is complicated, labor-intensive, and cost-ineffective. We proposed an ex vivo ovine arteriovenous shunt model in which we can test the patency and physical properties of vascular grafts under physiologic conditions. The pressure, flow rate, and vascular diameter were monitored in real-time in order to evaluate the pulse wave velocity, augmentation index, and dynamic elastic modulus, all indicators of graft stiffness. Carotid arteries, jugular veins, and small intestinal submucosa-based grafts were tested. SIS grafts demonstrated physical properties between those of carotid arteries and jugular veins. Anticoagulation properties of grafts were assessed via scanning electron microscopy imaging, en face immunostaining, and histology. Luminal seeding with endothelial cells greatly decreased the attachment of thrombotic components. This model is also suture free, allowing for multiple samples to be stably processed within one animal. This tunable (pressure, flow, shear) ex vivo shunt model can be used to optimize the implantability and long-term patency of tissue-engineered vascular constructs.
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Affiliation(s)
- Haofan Peng
- Department of Chemical and Biological Engineering, Women and Children's Hospital of Buffalo, N.Y., USA
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Couture L, Richer LP, Cadieux C, Thomson CM, Hossain SM. An optimized method to assess in vivo efficacy of antithrombotic drugs using optical coherence tomography and a modified Doppler flow system. J Pharmacol Toxicol Methods 2011; 64:264-8. [PMID: 21967828 DOI: 10.1016/j.vascn.2011.09.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Revised: 09/08/2011] [Accepted: 09/15/2011] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Animal models of venous and arterial thrombosis are extremely useful to study the efficacy of antithrombotic agents. Variability in efficacy data is often observed in those preclinical studies. The goal of this study was to optimize the methodology for assessing antithrombotic drug efficacy by the use of optical coherence tomography (OCT) and a modified Doppler flow system in rat models of thrombosis. METHODS Thrombus formation was assessed in both the rat venous and arterial ferric chloride (FeCl(3)) models of thrombosis. In the venous model, thrombus volume post-treatment was measured using OCT, and data were correlated against the thrombus weight. In the arterial model, the time to occlusion was measured using a Doppler flow probe connected to a perivascular flow module which allowed the reporting of dynamic blood flow data every 30s. Heparin (130 or 165U/kg), argatroban (4.5mg/kg), bivalirudin (1.3mg/kg) or saline were administered intravenously. RESULTS In the venous model, for all treatment groups a strong linear correlation (R(2)=0.998) was observed between thrombus volume measured by OCT and thrombus weight. In the arterial model, using a high sampling rate of a dynamic blood flow using a modified Doppler flow system provided data accuracy and precision of the time to occlusion measurement. DISCUSSION This study demonstrates that OCT is a powerful tool for the assessment of antithrombotic drug efficacy. Furthermore, it shows that a high Doppler sampling rates of dynamic blood flow leads to data accuracy and precision.
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Affiliation(s)
- L Couture
- In Vivo Pharmacology Department, Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec, Canada, H4P 2R2
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Priya N, Singh P, Bhatia S, Medhi B, Prasad AK, Parmar VS, Raj HG. Characterization of a unique dihydropyrimidinone, ethyl 4-(4'-heptanoyloxyphenyl)-6-methyl-3,4-dihydropyrimidin-2-one-5-carboxylate, as an effective antithrombotic agent in a rat experimental model. J Pharm Pharmacol 2011; 63:1175-85. [PMID: 21827490 DOI: 10.1111/j.2042-7158.2011.01316.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVES To evaluate the potential of a novel dihydropyrimidinone, ethyl 4-(4'-heptanoyloxyphenyl)-6-methyl-3,4-dihydropyrimidin-2-one-5-carboxylate (H-DHPM), as a calcium channel blocker, endowed with the ability to inhibit platelet aggregation effectively. METHODS In-vitro and in-vivo studies were conducted for the determination of antiplatelet activity using adenosine diphosphate (ADP), collagen or thrombin as inducers. Calcium channel blocking activity and nitric oxide synthase (NOS) activity were monitored. Lipopolysaccharide (LPS)-mediated prothrombotic conditions were developed in rats to study the efficacy of H-DHPM to suitably modulate the inflammatory mediators such as inducible NOS (iNOS) and tissue factor. The cGMP level and endothelial NOS (eNOS) expression were checked in aortic homogenate of LPS-challenged rats pretreated with H-DHPM. The effect of H-DHPM on FeCl(3) -induced thrombus formation in rats was examined. KEY FINDINGS The concentrations of H-DHPM required to give 50% inhibition (IC50) of in-vitro platelet aggregation induced by ADP, collagen or thrombin were 98.2±2.1, 74.5±2.3 and 180.7±3.4µm, respectively. H-DHPM at a dose of 52.0±0.02mg/kg (133µmol/kg) was found to optimally inhibit ADP-induced platelet aggregation in-vivo. The level of nitric oxide was found to be up to 9±0.08-fold in H-DHPM-treated platelets in-vitro and 8.2±0.05-fold in H-DHPM-pretreated rat platelets in-vivo compared with control. OH-DHPM, the parent compound was found to be ineffective both in-vitro and in-vivo. H-DHPM-pretreated rats were able to resist significantly the prothrombotic changes caused by LPS by blunting the expression of iNOS, tissue factor and diminishing the increased level of cGMP to normal. H-DHPM enhanced the eNOS expression in aorta of rats treated with LPS. H-DHPM displayed synergy with antiplatelet activity of aspirin even at lower doses. H-DHPM was found to inhibit the LPS-induced platelet aggregation in younger as well as older rats. H-DHPM exhibited the ability to markedly decrease FeCl(3) -induced thrombus formation in rats. CONCLUSIONS H-DHPM has the attributes of a promising potent antiplatelet candidate molecule that should attract further study. H-DHPM displayed antiplatelet activity both in vivo and in vitro, which was due partially by lowering the intraplatelet calcium concentration.
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Affiliation(s)
- Nivedita Priya
- Department of Biochemistry, V.P. Chest Institute, Delhi-110007, India
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A time course study on prothrombotic parameters and their modulation by anti-platelet drugs in hyperlipidemic hamsters. J Physiol Biochem 2011; 67:205-16. [PMID: 21286889 DOI: 10.1007/s13105-010-0065-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Accepted: 12/09/2010] [Indexed: 12/20/2022]
Abstract
The present study was undertaken to assess the chronology of major pathological events associated with high cholesterol (HC) diet and their modulation by anti-platelet drugs. Male Golden Syrian hamsters were fed HC diet up to 90 days. Plasma lipid, glucose and coagulation parameters (commercial kits), platelet activation (whole blood aggregation and static adhesion), endothelial dysfunction (aortic ring vasoreactivity), splenocyte TNF-α, IFN-γ and iNOS mRNA transcripts (RT-PCR), and ferric chloride (time to occlusion) induced thrombosis were monitored at 15, 30, 60, and 90 days after HC feeding and compared with normolipidemic hamsters. A significant increase in plasma lipid levels was observed at 15 days of HC feeding, but other parameters remain unaltered. Enhanced ADP, collagen, and thrombin-induced platelet aggregation, splenocyte TNF-α expression along with endothelial dysfunction were observed from 30 to 90 days of HC feeding. Platelet adhesion on collagen-/fibrinogen-coated surface and IFN-γ expression were augmented only after 60 days, while enhanced iNOS expression, reduction in thrombin time, and potentiation of ferric chloride-induced thrombosis was observed only at 90 days of HC feeding. Thus, pathological changes induced by HC diet depend on the duration and extent of hyperlipidemia. Moreover, hamsters treated with anti-platelet drugs aspirin (5 mg/kg) or clopidogrel (10 mg/kg) along with HC feeding exhibited reduction in platelet activation as well as subsequent changes observed in the abovementioned parameters following HC feeding. Since reduction in TNF-α was associated with reversion in endothelial dysfunction and prothrombotic state, the role of platelets is implicated in the pathological changes associated with HC feeding.
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