1
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Srivastava A, Kumari N, Agarwal M, Bhati P, Bhatnagar N. Fabrication and characterization of bioresorbable radiopaque PLLA/PCL/Mg alloy composite tubes for cardiovascular stent application. INT J POLYM MATER PO 2023. [DOI: 10.1080/00914037.2023.2182783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2023]
Affiliation(s)
- Alok Srivastava
- Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India
| | - Nisha Kumari
- Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India
| | - Mohit Agarwal
- Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India
| | - Pooja Bhati
- Department of Mechanical and Automation Engineering, Indira Gandhi Delhi Technical University for Women, New Delhi, India
| | - Naresh Bhatnagar
- Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India
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2
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Sefton MV, Gorbet MB. Nonthrombogenic Treatments and Strategies. Biomater Sci 2020. [DOI: 10.1016/b978-0-12-816137-1.00035-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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3
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Braune S, Latour RA, Reinthaler M, Landmesser U, Lendlein A, Jung F. In Vitro Thrombogenicity Testing of Biomaterials. Adv Healthc Mater 2019; 8:e1900527. [PMID: 31612646 DOI: 10.1002/adhm.201900527] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 08/15/2019] [Indexed: 12/29/2022]
Abstract
The short- and long-term thrombogenicity of implant materials is still unpredictable, which is a significant challenge for the treatment of cardiovascular diseases. A knowledge-based approach for implementing biofunctions in materials requires a detailed understanding of the medical device in the biological system. In particular, the interplay between material and blood components/cells as well as standardized and commonly acknowledged in vitro test methods allowing a reproducible categorization of the material thrombogenicity requires further attention. Here, the status of in vitro thrombogenicity testing methods for biomaterials is reviewed, particularly taking in view the preparation of test materials and references, the selection and characterization of donors and blood samples, the prerequisites for reproducible approaches and applied test systems. Recent joint approaches in finding common standards for a reproducible testing are summarized and perspectives for a more disease oriented in vitro thrombogenicity testing are discussed.
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Affiliation(s)
- Steffen Braune
- Institute of Biomaterial Science and Berlin‐Brandenburg Centre for Regenerative Therapies (BCRT)Helmholtz‐Zentrum Geesthacht Kantstrasse 55 14513 Teltow Germany
| | - Robert A. Latour
- Rhodes Engineering Research CenterDepartment of BioengineeringClemson University Clemson SC 29634 USA
| | - Markus Reinthaler
- Institute of Biomaterial Science and Berlin‐Brandenburg Centre for Regenerative Therapies (BCRT)Helmholtz‐Zentrum Geesthacht Kantstrasse 55 14513 Teltow Germany
- Department for CardiologyCharité UniversitätsmedizinCampus Benjamin Franklin Hindenburgdamm 30 12203 Berlin Germany
| | - Ulf Landmesser
- Department for CardiologyCharité UniversitätsmedizinCampus Benjamin Franklin Hindenburgdamm 30 12203 Berlin Germany
| | - Andreas Lendlein
- Institute of Biomaterial Science and Berlin‐Brandenburg Centre for Regenerative Therapies (BCRT)Helmholtz‐Zentrum Geesthacht Kantstrasse 55 14513 Teltow Germany
- Institute of ChemistryUniversity of Potsdam Karl‐Liebknecht‐Strasse 24‐25 14476 Potsdam Germany
- Helmholtz Virtual Institute “Multifunctional Biomaterials for Medicine”Helmholtz‐Zentrum Geesthacht Kantstrasse 55 14513 Teltow Germany
| | - Friedrich Jung
- Institute of Biomaterial Science and Berlin‐Brandenburg Centre for Regenerative Therapies (BCRT)Helmholtz‐Zentrum Geesthacht Kantstrasse 55 14513 Teltow Germany
- Helmholtz Virtual Institute “Multifunctional Biomaterials for Medicine”Helmholtz‐Zentrum Geesthacht Kantstrasse 55 14513 Teltow Germany
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4
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Maitz MF, Martins MCL, Grabow N, Matschegewski C, Huang N, Chaikof EL, Barbosa MA, Werner C, Sperling C. The blood compatibility challenge. Part 4: Surface modification for hemocompatible materials: Passive and active approaches to guide blood-material interactions. Acta Biomater 2019; 94:33-43. [PMID: 31226481 DOI: 10.1016/j.actbio.2019.06.019] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 05/29/2019] [Accepted: 06/13/2019] [Indexed: 12/22/2022]
Abstract
Biomedical devices in the blood flow disturb the fine-tuned balance of pro- and anti-coagulant factors in blood and vessel wall. Numerous technologies have been suggested to reduce coagulant and inflammatory responses of the body towards the device material, ranging from camouflage effects to permanent activity and further to a responsive interaction with the host systems. However, not all types of modification are suitable for all types of medical products. This review has a focus on application-oriented considerations of hemocompatible surface fittings. Thus, passive versus bioactive modifications are discussed along with the control of protein adsorption, stability of the immobilization, and the type of bioactive substance, biological or synthetic. Further considerations are related to the target system, whether enzymes or cells should be addressed in arterial or venous system, or whether the blood vessel wall is addressed. Recent developments like feedback controlled or self-renewing systems for drug release or addressing cellular regulation pathways of blood platelets and endothelial cells are paradigms for a generation of blood contacting devices, which are hemocompatible by cooperation with the host system. STATEMENT OF SIGNIFICANCE: This paper is part 4 of a series of 4 reviews discussing the problem of biomaterial associated thrombogenicity. The objective was to highlight features of broad agreement and provide commentary on those aspects of the problem that were subject to dispute. We hope that future investigators will update these reviews as new scholarship resolves the uncertainties of today.
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Affiliation(s)
- Manfred F Maitz
- Institute Biofunctional Polymer Materials, Max Bergmann Center of Biomaterials, Leibniz-Institut für Polymerforschung Dresden e.V., Dresden, Germany; Key Laboratory of Advanced Technology for Materials of Education Ministry, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China.
| | - M Cristina L Martins
- i3S, Instituto de Investigação e Inovação em Saúde, Portugal; INEB, Instituto de Engenharia Biomédica, Rua Alfredo Allen, 208, 4200-135 Porto, Portugal; ICBAS, Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal
| | - Niels Grabow
- Institut für Biomedizinische Technik, Universitätsmedizin Rostock, Friedrich-Barnewitz-Str. 4, 18119 Rostock, Germany
| | - Claudia Matschegewski
- Institut für Biomedizinische Technik, Universitätsmedizin Rostock, Friedrich-Barnewitz-Str. 4, 18119 Rostock, Germany; Institute for ImplantTechnology and Biomaterials (IIB) e.V., Friedrich-Barnewitz-Str. 4, 18119 Rostock, Germany
| | - Nan Huang
- Key Laboratory of Advanced Technology for Materials of Education Ministry, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Elliot L Chaikof
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Boston, MA 02115, United States; Wyss Institute for Biologically Inspired Engineering at Harvard University, 3 Blackfan Circle, Boston, MA 02115, United States; Harvard-MIT Division of Health Sciences and Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States
| | - Mário A Barbosa
- i3S, Instituto de Investigação e Inovação em Saúde, Portugal; INEB, Instituto de Engenharia Biomédica, Rua Alfredo Allen, 208, 4200-135 Porto, Portugal; ICBAS, Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal
| | - Carsten Werner
- Institute Biofunctional Polymer Materials, Max Bergmann Center of Biomaterials, Leibniz-Institut für Polymerforschung Dresden e.V., Dresden, Germany
| | - Claudia Sperling
- Institute Biofunctional Polymer Materials, Max Bergmann Center of Biomaterials, Leibniz-Institut für Polymerforschung Dresden e.V., Dresden, Germany
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5
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Shi P, Zhang L, Tian W, Li H, Wang Q, Yi H, Yin Y, Wang A, Ning P, Dong F, Wang J. Preparation and anticoagulant activity of functionalised silk fibroin. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.01.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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6
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Skoog SA, Kumar G, Narayan RJ, Goering PL. Biological responses to immobilized microscale and nanoscale surface topographies. Pharmacol Ther 2017; 182:33-55. [PMID: 28720431 DOI: 10.1016/j.pharmthera.2017.07.009] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cellular responses are highly influenced by biochemical and biomechanical interactions with the extracellular matrix (ECM). Due to the impact of ECM architecture on cellular responses, significant research has been dedicated towards developing biomaterials that mimic the physiological environment for design of improved medical devices and tissue engineering scaffolds. Surface topographies with microscale and nanoscale features have demonstrated an effect on numerous cellular responses, including cell adhesion, migration, proliferation, gene expression, protein production, and differentiation; however, relationships between biological responses and surface topographies are difficult to establish due to differences in cell types and biomaterial surface properties. Therefore, it is important to optimize implant surface feature characteristics to elicit desirable biological responses for specific applications. The goal of this work was to review studies investigating the effects of microstructured and nanostructured biomaterials on in vitro biological responses through fabrication of microscale and nanoscale surface topographies, physico-chemical characterization of material surface properties, investigation of protein adsorption dynamics, and evaluation of cellular responses in specific biomedical applications.
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Affiliation(s)
- Shelby A Skoog
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD, United States; Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Raleigh, NC, United States
| | - Girish Kumar
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD, United States
| | - Roger J Narayan
- Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Raleigh, NC, United States
| | - Peter L Goering
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD, United States.
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7
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Pramanik N, Dutta K, Basu RK, Kundu PP. Aromatic π-Conjugated Curcumin on Surface Modified Polyaniline/Polyhydroxyalkanoate Based 3D Porous Scaffolds for Tissue Engineering Applications. ACS Biomater Sci Eng 2016; 2:2365-2377. [DOI: 10.1021/acsbiomaterials.6b00595] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nilkamal Pramanik
- Advanced
Polymer Laboratory, Department of Polymer Science and Technology, University of Calcutta, 92, A.P.C. Road, Kolkata-700 009, India
| | - Kingshuk Dutta
- Advanced
Polymer Laboratory, Department of Polymer Science and Technology, University of Calcutta, 92, A.P.C. Road, Kolkata-700 009, India
| | - Ranjan K. Basu
- Department
of Chemical Engineering, University of Calcutta, 92, A.P.C. Road, Kolkata-700 009, India
| | - Patit P. Kundu
- Advanced
Polymer Laboratory, Department of Polymer Science and Technology, University of Calcutta, 92, A.P.C. Road, Kolkata-700 009, India
- Department
of Chemical Engineering, Indian Institute of Technology (IIT) Roorkee, Roorkee, Uttarakhand-247667, India
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8
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Skoog SA, Lu Q, Malinauskas RA, Sumant AV, Zheng J, Goering PL, Narayan RJ, Casey BJ. Effects of nanotopography on the in vitro hemocompatibility of nanocrystalline diamond coatings. J Biomed Mater Res A 2016; 105:253-264. [PMID: 27543370 DOI: 10.1002/jbm.a.35872] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 07/29/2016] [Accepted: 08/18/2016] [Indexed: 01/14/2023]
Abstract
Nanocrystalline diamond (NCD) coatings have been investigated for improved wear resistance and enhanced hemocompatibility of cardiovascular devices. The goal of this study was to evaluate the effects of NCD surface nanotopography on in vitro hemocompatibility. NCD coatings with small (NCD-S) and large (NCD-L) grain sizes were deposited using microwave plasma chemical vapor deposition and characterized using scanning electron microscopy, atomic force microscopy, contact angle testing, and Raman spectroscopy. NCD-S coatings exhibited average grain sizes of 50-80 nm (RMS 5.8 nm), while NCD-L coatings exhibited average grain sizes of 200-280 nm (RMS 23.1 nm). In vitro hemocompatibility testing using human blood included protein adsorption, hemolysis, nonactivated partial thromboplastin time, platelet adhesion, and platelet activation. Both NCD coatings demonstrated low protein adsorption, a nonhemolytic response, and minimal activation of the plasma coagulation cascade. Furthermore, the NCD coatings exhibited low thrombogenicity with minimal platelet adhesion and aggregation, and similar morphological changes to surface-bound platelets (i.e., activation) in comparison to the HDPE negative control material. For all assays, there were no significant differences in the blood-material interactions of NCD-S versus NCD-L. The two tested NCD coatings, regardless of nanotopography, had similar hemocompatibility profiles compared to the negative control material (HDPE) and should be further evaluated for use in blood-contacting medical devices. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 253-264, 2017.
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Affiliation(s)
- Shelby A Skoog
- Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Raleigh, North Carolina.,Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, Maryland
| | - Qijin Lu
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, Maryland
| | - Richard A Malinauskas
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, Maryland
| | - Anirudha V Sumant
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois
| | - Jiwen Zheng
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, Maryland
| | - Peter L Goering
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, Maryland
| | - Roger J Narayan
- Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Raleigh, North Carolina
| | - Brendan J Casey
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, Maryland
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9
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Wu F, Li J, Zhang K, He Z, Yang P, Zou D, Huang N. Multifunctional Coating Based on Hyaluronic Acid and Dopamine Conjugate for Potential Application on Surface Modification of Cardiovascular Implanted Devices. ACS APPLIED MATERIALS & INTERFACES 2016; 8:109-121. [PMID: 26654689 DOI: 10.1021/acsami.5b07427] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Surface modification by conjugating biomolecules has been widely proved to enhance biocompatibility of cardiovascular implanted devices. Here, we aimed at developing a multifunctional surface that not only provides good hemocompatibility but also functions well in inducing desirable vascular cell-material interaction. In the present work, the multicoatings of hyaluronic acid (HA) and dopamine (PDA) were prepared onto 316L stainless steel (316L SS) via chemical conjugation (Michael addition, Schiff base reaction, and electrostatic adsorption). The results of platelet adhesion and activation and the whole blood tests indicated that the HA/PDA coatings obtained better hemocompatibility compared with the bare 316L SS and HA or PDA immobilized on 316L SS. The HA/PDA coatings also inhibited the proliferation of smooth muscle cells and adhesion/activation of macrophages effectively, whereas not all the HA/PDA coatings improved surface endothelialization rapidly and the effects of the multifunctional coatings on endothelial cell growth depend on the HA amounts (1.0, 2.0, and 5.0 mg/mL, labeled as PDA-HA-1, PDA-HA-2, and PDA-HA-5 respectively). Herein the PDA-HA-1 and PDA-HA-2 coatings were found to improve endothelial cell adhesion and proliferation significantly. The tissue compatibility of the HA/PDA coatings also depends on the HA amounts, and the PDA-HA-2 coating was proved to cause milder in vivo tissue response. Additionally, the mechanism of the HA molecular weight change and in vivo tissue response was also explored. These results effectively suggested that the HA/PDA coating might be promising when serving as a cardiovascular implanted device coating.
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Affiliation(s)
- Feng Wu
- Key Lab. for Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University , Chengdu 610031, PR China
| | - Jingan Li
- Key Lab. for Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University , Chengdu 610031, PR China
| | - Kun Zhang
- Key Lab. for Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University , Chengdu 610031, PR China
- School of Life Science, Zhengzhou University , 100 Science Road, Zhengzhou 450001, PR China
- Center of Stem Cell and Regenerative Medicine, First Affiliated Hospital of Zhengzhou University , 40 University Road, Zhengzhou 450052, PR China
| | - Zikun He
- Key Lab. for Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University , Chengdu 610031, PR China
| | - Ping Yang
- Key Lab. for Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University , Chengdu 610031, PR China
| | - Dan Zou
- Key Lab. for Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University , Chengdu 610031, PR China
| | - Nan Huang
- Key Lab. for Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University , Chengdu 610031, PR China
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10
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Lin KY, Lo JH, Consul N, Kwong GA, Bhatia SN. Self-titrating anticoagulant nanocomplexes that restore homeostatic regulation of the coagulation cascade. ACS NANO 2014; 8:8776-85. [PMID: 25119520 PMCID: PMC4174090 DOI: 10.1021/nn501129q] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Antithrombotic therapy is a critical portion of the treatment regime for a number of life-threatening conditions, including cardiovascular disease, stroke, and cancer; yet, proper clinical management of anticoagulation remains a challenge because existing agents increase the propensity for bleeding in patients. Here, we describe the development of a bioresponsive peptide-polysaccharide nanocomplex that utilizes a negative feedback mechanism to self-titrate the release of anticoagulant in response to varying levels of coagulation activity. This nanoscale self-titrating activatable therapeutic, or nanoSTAT, consists of a cationic thrombin-cleavable peptide and heparin, an anionic polysaccharide and widely used clinical anticoagulant. Under nonthrombotic conditions, nanoSTATs circulate inactively, neither releasing anticoagulant nor significantly prolonging bleeding time. However, in response to life-threatening pulmonary embolism, nanoSTATs locally release their drug payload and prevent thrombosis. This autonomous negative feedback regulator may improve antithrombotic therapy by increasing the therapeutic window and decreasing the bleeding risk of anticoagulants.
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Affiliation(s)
- Kevin Y. Lin
- Department of Chemical Engineering and Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Justin H. Lo
- Department of Chemical Engineering and Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Medical Scientist Training Program, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Nikita Consul
- Department of Chemical Engineering and Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Gabriel A. Kwong
- Department of Chemical Engineering and Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Sangeeta N. Bhatia
- Department of Chemical Engineering and Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Broad Institute of Harvard and MIT, Cambridge, Massachusetts 02142, United States
- Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts 02115, United States
- Electrical Engineering and Computer Science, David H. Koch Institute for Integrative Cancer Research, MIT, Cambridge, Massachusetts 02139, United States
- Howard Hughes Medical Institute, Chevy Chase, Maryland 20815, United States
- Address correspondence to
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11
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Bio-responsive polymer hydrogels homeostatically regulate blood coagulation. Nat Commun 2014; 4:2168. [PMID: 23868446 PMCID: PMC3759053 DOI: 10.1038/ncomms3168] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Accepted: 06/19/2013] [Indexed: 01/19/2023] Open
Abstract
Bio-responsive polymer architectures can empower medical therapies by engaging molecular feedback-response mechanisms resembling the homeostatic adaptation of living tissues to varying environmental constraints. Here we show that a blood coagulation-responsive hydrogel system can deliver heparin in amounts triggered by the environmental levels of thrombin, the key enzyme of the coagulation cascade, which—in turn—becomes inactivated due to released heparin. The bio-responsive hydrogel quantitatively quenches blood coagulation over several hours in the presence of pro-coagulant stimuli and during repeated incubation with fresh, non-anticoagulated blood. These features enable the introduced material to provide sustainable, autoregulated anticoagulation, addressing a key challenge of many medical therapies. Beyond that, the explored concept may facilitate the development of materials that allow the effective and controlled application of drugs and biomolecules. Implementing biomolecular recognition mechanisms in synthetic materials may enable a wealth of biomedical and related applications. Here Maitz et al. present a bio-responsive hydrogel that releases the anticoagulant heparin in amounts proportional to the environmental levels of the procoagulatory protein thrombin.
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12
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Durgadas CV, Sreenivasan K, Sharma CP. Bright blue emitting CuSe/ZnS/silica core/shell/shell quantum dots and their biocompatibility. Biomaterials 2012; 33:6420-9. [DOI: 10.1016/j.biomaterials.2012.05.051] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Accepted: 05/20/2012] [Indexed: 11/25/2022]
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13
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Onder S, Kazmanli K, Kok FN. Alteration of PTFE Surface to Increase Its Blood Compatibility. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 22:1443-57. [DOI: 10.1163/092050610x510551] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Sakip Onder
- a Istanbul Technical University, Molecular Biology-Genetics and Biotechnology Program (MOBGAM), 34469 Maslak, Istanbul, Turkey
| | - Kursat Kazmanli
- b Istanbul Technical University, Metallurgical and Materials Engineering Department, 34469 Maslak, Istanbul, Turkey
| | - Fatma Nese Kok
- c Istanbul Technical University, Molecular Biology-Genetics and Biotechnology Program (MOBGAM), 34469 Maslak, Istanbul, Turkey; Istanbul Technical University, Molecular Biology and Genetics Department, 34469 Maslak, Istanbul, Turkey
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15
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Qu Z, Muthukrishnan S, Urlam MK, Haller CA, Jordan SW, Kumar VA, Marzec UM, Elkasabi Y, Lahann J, Hanson SR, Chaikof EL. A biologically active surface enzyme assembly that attenuates thrombus formation. ADVANCED FUNCTIONAL MATERIALS 2011; 21:4736-4743. [PMID: 23532366 PMCID: PMC3606904 DOI: 10.1002/adfm.201101687] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Activation of hemostatic pathways by blood-contacting materials remains a major hurdle in the development of clinically durable artificial organs and implantable devices. We postulate that surface-induced thrombosis may be attenuated by the reconstitution onto blood contacting surfaces of bioactive enzymes that regulate the production of thrombin, a central mediator of both clotting and platelet activation cascades. Thrombomodulin (TM), a transmembrane protein expressed by endothelial cells, is an established negative regulator of thrombin generation in the circulatory system. Traditional techniques to covalently immobilize enzymes on solid supports may modify residues contained within or near the catalytic site, thus reducing the bioactivity of surface enzyme assemblies. In this report, we present a molecular engineering and bioorthogonal chemistry approach to site-specifically immobilize a biologically active recombinant human TM fragment onto the luminal surface of small diameter prosthetic vascular grafts. Bioactivity and biostability of TM modified grafts is confirmed in vitro and the capacity of modified grafts to reduce platelet activation is demonstrated using a non-human primate model. These studies indicate that molecularly engineered interfaces that display TM actively limit surface-induced thrombus formation.
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Affiliation(s)
- Zheng Qu
- Departments of Biomedical Engineering and Surgery, Georgia Institute of Technology and Emory University Atlanta, GA 30322 (USA)
| | - Sharmila Muthukrishnan
- Departments of Biomedical Engineering and Surgery, Georgia Institute of Technology and Emory University Atlanta, GA 30322 (USA)
| | - Murali K. Urlam
- Departments of Biomedical Engineering and Surgery, Georgia Institute of Technology and Emory University Atlanta, GA 30322 (USA)
| | - Carolyn A. Haller
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, and the Wyss Institute of Biologically Inspired Engineering of Harvard University Boston, MA 02115 (USA)
| | - Sumanas W. Jordan
- Departments of Biomedical Engineering and Surgery, Georgia Institute of Technology and Emory University Atlanta, GA 30322 (USA)
| | - Vivek A. Kumar
- Departments of Biomedical Engineering and Surgery, Georgia Institute of Technology and Emory University Atlanta, GA 30322 (USA)
| | - Ulla M. Marzec
- Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR 97006 (USA)
| | - Yaseen Elkasabi
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109 (USA)
| | - Joerg Lahann
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109 (USA)
| | - Stephen R. Hanson
- Oregon National Primate Research Center, Oregon Health and Science University Beaverton, OR 97006 (USA)
| | - Elliot L. Chaikof
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, and the Wyss Institute of Biologically Inspired Engineering of Harvard University Boston, MA 02115 (USA)
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16
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Anti-fouling bioactive surfaces. Acta Biomater 2011; 7:1550-7. [PMID: 21195214 DOI: 10.1016/j.actbio.2010.12.021] [Citation(s) in RCA: 220] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Revised: 11/30/2010] [Accepted: 12/20/2010] [Indexed: 01/15/2023]
Abstract
Bioactive surfaces refer to surfaces with immobilized bioactive molecules aimed specifically at promoting or supporting particular interactions. Such surfaces are of great importance for various biomedical and biomaterials applications. In the past few years, considerable effort has been made to create bioactive surfaces by forming specific biomolecule-modified surfaces on a non-biofouling "base" or "background". Hydrophilic and bioinert polymers have been widely used as anti-fouling layers that resist non-specific protein interactions. They can also serve as "spacers" to effectively move the immobilized biomolecule away from the surface, thus enhancing its bioactivity. In this review we summarize several successful approaches for the design and preparation of bioactive surfaces based on different types of anti-fouling/spacer materials. Some perspectives on future research in this area are also presented.
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17
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Muthusubramaniam L, Lowe R, Fissell WH, Li L, Marchant RE, Desai TA, Roy S. Hemocompatibility of silicon-based substrates for biomedical implant applications. Ann Biomed Eng 2011; 39:1296-305. [PMID: 21287275 PMCID: PMC3069312 DOI: 10.1007/s10439-011-0256-y] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Accepted: 01/18/2011] [Indexed: 11/24/2022]
Abstract
Silicon membranes with highly uniform nanopore sizes fabricated using microelectromechanical systems (MEMS) technology allow for the development of miniaturized implants such as those needed for renal replacement therapies. However, the blood compatibility of silicon has thus far been an unresolved issue in the use of these substrates in implantable biomedical devices. We report the results of hemocompatibility studies using bare silicon, polysilicon, and modified silicon substrates. The surface modifications tested have been shown to reduce protein and/or platelet adhesion, thus potentially improving biocompatibility of silicon. Hemocompatibility was evaluated under four categories—coagulation (thrombin–antithrombin complex, TAT generation), complement activation (complement protein, C3a production), platelet activation (P-selectin, CD62P expression), and platelet adhesion. Our tests revealed that all silicon substrates display low coagulation and complement activation, comparable to that of Teflon and stainless steel, two materials commonly used in medical implants, and significantly lower than that of diethylaminoethyl (DEAE) cellulose, a polymer used in dialysis membranes. Unmodified silicon and polysilicon showed significant platelet attachment; however, the surface modifications on silicon reduced platelet adhesion and activation to levels comparable to that on Teflon. These results suggest that surface-modified silicon substrates are viable for the development of miniaturized renal replacement systems.
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Affiliation(s)
- Lalitha Muthusubramaniam
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, Box 2520, QB3 Second Floor BH203, San Francisco, CA 94158-2330 USA
- Joint Graduate Group in Bioengineering, University of California, San Francisco–University of California, Berkeley, San Francisco, CA USA
| | - Rachel Lowe
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, Box 2520, QB3 Second Floor BH203, San Francisco, CA 94158-2330 USA
| | - William H. Fissell
- Department of Biomedical Engineering, Cleveland Clinic, Cleveland, OH USA
- Department of Nephrology and Hypertension, Cleveland Clinic, Cleveland, OH USA
| | - Lingyan Li
- Department of Biomedical Engineering, Cleveland Clinic, Cleveland, OH USA
| | - Roger E. Marchant
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH USA
| | - Tejal A. Desai
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, Box 2520, QB3 Second Floor BH203, San Francisco, CA 94158-2330 USA
- Joint Graduate Group in Bioengineering, University of California, San Francisco–University of California, Berkeley, San Francisco, CA USA
| | - Shuvo Roy
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, Box 2520, QB3 Second Floor BH203, San Francisco, CA 94158-2330 USA
- Joint Graduate Group in Bioengineering, University of California, San Francisco–University of California, Berkeley, San Francisco, CA USA
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Maitz MF, Sperling C, Werner C. Immobilization of the irreversible thrombin inhibitor D-Phe-Pro-Arg-chloromethylketone: a concept for hemocompatible surfaces? J Biomed Mater Res A 2010; 94:905-12. [PMID: 20730927 DOI: 10.1002/jbm.a.32780] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The irreversible thrombin inhibitor D-Phe-Pro-Arg-chloromethylketone (PPACK) was covalently immobilized to PEGylated polymer thin films at its primary alpha-amino group. Activity assays and capture of radioconjugated thrombin reveal that the PPACK-decorated surfaces could bind thrombin forming up to 30% of a monolayer density. Back-calculation of this high thrombin-inhibiting capacity indicated that the surface immobilization of the inhibitor was still associated with more than two orders of magnitude of loss of activity; increasing activity was observed at higher surface densities. PPACK-containing polymer films almost duplicated the plasma coagulation time when compared with the reference substrate without inhibitor. In whole blood, however, the anticoagulant properties were below those previously found for benzamidine-type reversible thrombin inhibitors; in addition, the surface exhibited inflammatory properties. It is concluded that immobilized reversible thrombin inhibitors are more effective by passivating higher amounts of thrombin in a cooperative action with antithrombin III.
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Affiliation(s)
- Manfred F Maitz
- Max Bergmann Center of Biomaterials Dresden, Leibniz Institute of Polymer Research Dresden, Dresden, Germany.
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Hou X, Wang X, Zhu Q, Bao J, Mao C, Jiang L, Shen J. Preparation of polypropylene superhydrophobic surface and its blood compatibility. Colloids Surf B Biointerfaces 2010; 80:247-50. [DOI: 10.1016/j.colsurfb.2010.06.013] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2010] [Revised: 06/09/2010] [Accepted: 06/17/2010] [Indexed: 10/19/2022]
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Yim EKF, Sefton MV. Amidine surface modification of poly(acrylonitrile-co-vinyl chloride) reduces platelet adhesion. J Biomed Mater Res A 2009; 89:780-90. [DOI: 10.1002/jbm.a.32022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Mao C, Liang C, Luo W, Bao J, Shen J, Hou X, Zhao W. Preparation of lotus-leaf-like polystyrene micro- and nanostructure films and its blood compatibility. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b912314h] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Chuang T, Lin D, Lin F. Immobilization of NaIO4‐treated heparin on PEG‐modified 316L SS surface for high anti‐thrombin‐III binding. J Biomed Mater Res A 2008; 86:648-61. [DOI: 10.1002/jbm.a.31662] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Salvagnini C, Gharbi S, Boxus T, Marchand-Brynaert J. Synthesis and evaluation of a small library of graftable thrombin inhibitors derived from (l)-arginine. Eur J Med Chem 2007; 42:37-53. [PMID: 17010480 DOI: 10.1016/j.ejmech.2006.07.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2006] [Revised: 07/17/2006] [Accepted: 07/20/2006] [Indexed: 10/24/2022]
Abstract
Novel piperazinyl-amide derivatives of N-alpha-(aryl-sulfonyl)-L-arginine were synthesized as graftable thrombin inhibitors, in the context of biomaterials' design. The possible disturbance of biological activity due to a variable spacer-arm fixed on the N-4 piperazinyl position and the introduction of a trifluoromethyl group as XPS (X-ray Photoelectron Spectroscopy) tag on the sulfonamide moiety were evaluated in vitro against human alpha-thrombin. All the compounds of the library were found to be active at the micromolar level, as the reference TAME (N-tosyl-L-arginine methyl ester). The blood compatibilization improvement of poly(ethylene terephthalate) (PET) membrane, coated or grafted by wet chemistry treatment with one representative inhibitor of the library, was also evaluated, showing interesting decrease in blood clot formation.
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Affiliation(s)
- Claudio Salvagnini
- Unité de Chimie Organique et Médicinale, Université catholique de Louvain, Bâtiment Lavoisier, Place Louis Pasteur 1, B-1348 Louvain-la-Neuve, Belgium
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25
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Tsukagoshi T, Kondo Y, Yoshino N. Protein adsorption and stability of poly(ethylene oxide)-modified surfaces having hydrophobic layer between substrate and polymer. Colloids Surf B Biointerfaces 2007; 54:82-7. [PMID: 17112708 DOI: 10.1016/j.colsurfb.2006.09.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2006] [Revised: 09/06/2006] [Accepted: 09/26/2006] [Indexed: 11/23/2022]
Abstract
The materials covered with poly(ethylene oxide) (PEO) are of use in a wide variety of biomaterials due to blood compatibility of this polymer. The long-term sustainability of its blood compatibility strongly depends on the stability of the PEO layer against aqueous environment. An attempt was made in the present work to immobilize a PEO layer on the silicon surfaces using a silane coupling agent with the aim to improve the waterproof durability of the layer. Several kinds of PEO-modified substrates having a densely and closely packed hydrocarbon layer between substrate and PEO layer were prepared and the stability of the PEO layer against phosphate buffer saline (pH 7.4) was examined in terms of the density of hydrocarbon chains. Those substrates which have a dense hydrophobic chain layer showed a high waterproof durability and a good ability to suppress protein adsorption.
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Affiliation(s)
- Tatsuya Tsukagoshi
- Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science, 12-1 Ichigaya-Funagawara, Shinjuku-ku, Tokyo 162-0826, Japan
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Werner C, Maitz MF, Sperling C. Current strategies towards hemocompatible coatings. ACTA ACUST UNITED AC 2007. [DOI: 10.1039/b703416b] [Citation(s) in RCA: 217] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Benzamidine-based coatings: Implication of inhibitor structure on the inhibition of coagulation enzymes in solution andin vitrohemocompatibility assessment. Biointerphases 2006; 1:146-55. [DOI: 10.1116/1.2431753] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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28
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Preparation and characterization of glycosylated maleic anhydride copolymer thin films. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2005.11.037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Sperling C, Houska M, Brynda E, Streller U, Werner C. In vitro hemocompatibility of albumin-heparin multilayer coatings on polyethersulfone prepared by the layer-by-layer technique. J Biomed Mater Res A 2006; 76:681-9. [PMID: 16302224 DOI: 10.1002/jbm.a.30519] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Polyethersulfone foils (PES)--a unique material for blood purification membranes--were coated with a multilayer assembly of heparin (unfractionated or high anticoagulant activity fraction heparin) and albumin (albumin-heparin coatings), or with a multilayer of albumin (albumin coating), using the layer-by-layer technique. The coatings combine advantages of albumin (reduction of nonspecific interactions) and heparin (specific interactions with blood coagulation proteins). The differences between the two heparins, while significant for their biological activity, had only a minor effect on the multilayer assembly with albumin monitored in situ by reflection infrared spectroscopy (FTIR MIRS). Uncoated as well as modified PES surfaces were evaluated using an in vitro assay with freshly drawn, slightly heparinized (1.5 IU heparin/mL) human whole blood. The blood was circulated with a roller pump over the sample surfaces in shear flow across rectangular slit channels ( app. 6 mL/min and 120 s(-1)) for 1.5 h at 37 degrees C. All coatings effectively reduced platelet adhesion and activation according to the PF4 release. The activation of coagulation evaluated as TAT generation was significantly lowered for the coating composed of albumin and high activity heparin. A further beneficial effect of the heparin containing coatings was reduced complement activation as determined by different complement fragments.
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Affiliation(s)
- Claudia Sperling
- Department of Biocompatible Materials, Leibniz Institute of Polymer Research Dresden and The Max Bergmann Center of Biomaterials Dresden, Hohe Str. 6, 01069 Dresden, Germany.
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Immobilization of Thrombin Inhibitors on Polyesters Surface: An Original Approach towards Materials Blood Compatibilization. ACTA ACUST UNITED AC 2006. [DOI: 10.4028/www.scientific.net/msf.514-516.961] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Piperazinyl-amide derivatives of N--(3-trifluoromethyl-benzenesulfonyl)-L-arginine were synthesized as graftable thrombin inhibitors. Their biological activity was evaluated in vitro, against human -thrombin, and in blood coagulation assay. The piperazinyl-amide derivatives were found to inhibit the activity of -thrombin in the micromolar range. The designed molecules were fixed on poly(ethylene terephthalate) (PET), and poly(butylene terephthalate) (PBT) by wet chemistry treatment (activation of hydroxyl chain-ends) and photochemistry (nitrene insertion by photoactivation of aromatic azide). The protocols were validated by X-ray photoelectron spectroscopy (XPS) and by radiochemical assay (liquid scintillation counting, LSC).
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Salchert K, Gouzy MF, Glorius M, Kühn A, Nitschke M, Werner C. Immobilization of an anticoagulant benzamidine derivative: effect of spacer arms and carrier hydrophobicity on thrombin binding. Acta Biomater 2005; 1:441-9. [PMID: 16701825 DOI: 10.1016/j.actbio.2005.04.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2004] [Revised: 03/02/2005] [Accepted: 04/07/2005] [Indexed: 11/29/2022]
Abstract
Prevention of blood coagulation is very often a prerequisite for successful medical devices. For that purpose, passivation of the key coagulation enzyme thrombin through the derivatization of the material's surface with an amidine-based molecule has been found to be promising. To further enhance the efficiency of this approach, thin layers of maleic anhydride copolymers offering different physico-chemical characteristics were tethered with carboxyl terminated polyethylene glycol to covalently immobilize a benzamidine-type derivative. The free carboxyl surface groups produced by the attachment of polyethylene glycol (PEG) were quantified by Ag(+) labeling and subsequent XPS detection. The film thickness as well as the carboxyl group content were found to be clearly dependent on the copolymer hydrophobicity and the nature of the PEG molecule. For the assessment of the anchorage of the thrombin to the benzamidine-derivative functionalized surfaces, the substrates were immersed in a buffered thrombin solution and the enzyme adsorption was studied using immunostaining/confocal laser scanning microscopy. Higher degrees of thrombin binding were observed for substrates configured with the hydrophilic compared to the more hydrophobic copolymer. Moreover, surface-bound spacers based on alpha,omega-heterobifunctional PEG amino acids (alphaAm,omegaAc-PEG) also enhanced the benzamidine surface density in comparison to homofunctional PEG diacids (alphaAc,omegaAc-PEG) because of a lower degree of carboxyl inactivation due to PEG 'bridging'. Altogether, the choice of copolymer coatings and the type of PEG spacers were demonstrated to enhance the efficiency of the thrombin scavenging by the covalently immobilized coagulation inhibitor.
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Affiliation(s)
- Katrin Salchert
- Department of Biomaterials, Leibniz Institute of Polymer Research Dresden eV and the Max Bergmann Center of Biomaterials Dresden, Germany
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Salvagnini C, Michaux C, Remiche J, Wouters J, Charlier P, Marchand-Brynaert J. Design, synthesis and evaluation of graftable thrombin inhibitors for the preparation of blood-compatible polymer materials. Org Biomol Chem 2005; 3:4209-20. [PMID: 16294249 DOI: 10.1039/b510239a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Piperazinyl-amide derivatives of N-alpha-(3-trifluoromethyl-benzenesulfonyl)-L-arginine (1) were synthesized as graftable thrombin inhibitors. The possible disturbance of biological activity due to a variable spacer-arm fixed on the N-4 piperazinyl position was evaluated in vitro, against human alpha-thrombin, and in blood coagulation assay. Molecular modelling (in silico analysis) and X-ray diffraction studies of thrombin-inhibitor complexes were also performed. The fixation of bioactive molecules on poly(butylene terephthalate) (PBT) and poly(ethylene terephthalate) (PET) membranes was performed by wet chemistry treatment and evaluated by XPS analysis. Surface grafting of inhibitor 1d improved the membrane hemocompatibility by reducing blood clot formation on the modified surface.
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Affiliation(s)
- Claudio Salvagnini
- Unité de Chimie Organique et Médicinale, Université catholique de Louvain, Bâtiment Lavoisier, place Louis Pasteur 1, B-1348, Louvain-la-Neuve, Belgium
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Gudipati CS, Greenlief CM, Johnson JA, Prayongpan P, Wooley KL. Hyperbranched fluoropolymer and linear poly(ethylene glycol) based amphiphilic crosslinked networks as efficient antifouling coatings: An insight into the surface compositions, topographies, and morphologies. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/pola.20466] [Citation(s) in RCA: 190] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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