1
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Xu LC, Siedlecki CA. FXII contact activation products have an inhibitory effect on αFXIIa. J Biomed Mater Res A 2024; 112:1213-1223. [PMID: 37737653 PMCID: PMC10957503 DOI: 10.1002/jbm.a.37612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/24/2023] [Accepted: 09/01/2023] [Indexed: 09/23/2023]
Abstract
It is accepted that the contact activation complex of the intrinsic pathway of blood coagulation cascade produces active enzymes that lead to plasma coagulation following biomaterial contact. In this study, FXII was activated through contact with hydrophilic glass beads and hydrophobic octadecyltrichlorosilane-modified glass beads from neat buffer solutions. These FXII contact activation products generated from material interaction were found to suppress the procoagulant activity of exogenous αFXIIa, and this inhibition was dependent on surface wettability and the concentration of exogenous αFXIIa. Higher relative inhibition rates were generally observed at low concentrations of αFXIIa (1-2 μg/mL) while both hydrophobic and hydrophilic materials showed similar inhibition levels (~39%) at high concentrations of αFXIIa (20 μg/mL). The presence of prekallikrein in the activation system increased the amount of FXIIa produced during FXII contact activation, and also suppressed the apparent levels of inhibitors on hydrophilic surfaces, while having no effect on apparent levels of inhibitors on hydrophobic surface. The combination of FXII contact activation products and activator surfaces was found to dramatically increase inhibition of αFXIIa activity compared to the activation products alone, regardless of activator surface wettability and the presence of prekallikrein. This finding of inhibitors in the suite of proteins generated by contact activation provides additional knowledge into the complex series of interactions that occur when plasma comes into contact with material surfaces.
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Affiliation(s)
- Li-Chong Xu
- Department of Surgery, Pennsylvania State University College of Medicine, Hershey, PA, 17033
| | - Christopher A. Siedlecki
- Department of Surgery, Pennsylvania State University College of Medicine, Hershey, PA, 17033
- Department of Bioengineering, Pennsylvania State University College of Medicine, Hershey, PA, 17033
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2
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Silva MAFS, Linhares CRB, Saboia-Dantas CJ, Limirio PHJO, de Assis Costa MDM, de Oliveira HAAB, Alves RN, Dechichi P. Fibrin Network and Platelets Densities in Platelet-Rich Fibrin (PRF) Membranes Produced from Plastic Tubes Without Additives: A New Approach to PRF Clinical Use. J Maxillofac Oral Surg 2024; 23:727-733. [PMID: 38911395 PMCID: PMC11189880 DOI: 10.1007/s12663-023-02103-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 12/23/2023] [Indexed: 06/25/2024] Open
Abstract
Background/Purpose The present study aimed to investigate plastic tubes without additives as alternatives to glass and silica-coated plastic tubes, in the production of PRF membranes. Materials and Methods Nine blood samples were collected from eight volunteers (n = 8) separated into three groups, according to tube material: glass, silica-coated plastic, and plastic without additives. In each group, the samples were centrifuged using different relative centrifugation forces: L-PRF (700 g/12 min), A-PRF (200 g/14 min), and A-PRF + (200 g/8 min). The generated membranes were evaluated by histomorphometry, considering the fibrin network, platelet aggregates, and cellular morphology, by light microscopy. The ultrastructural cellular morphology integrity was evaluated by transmission electron microscopy. Results The L-PRF (p < 0.019) and A-PRF (p < 0.001) membranes showed a significantly lower fibrin network density in plastic tubes without additives compared to glass and silica-coated plastic tubes. Plastic tubes without additives revealed a significantly higher platelet percentage, regardless of the protocol (p < 0.005). In all groups, TEM analysis showed preserved normal morphological ultrastructure, maintaining the integrity of cellular components. Conclusion Plastic tubes without additives offer a viable alternative for producing PRF membranes. They exhibited a higher platelet density and demonstrated fibrin network and cellular morphology similar to those of glass and silica-coated plastic tubes, irrespective of the centrifugation protocol.
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Affiliation(s)
| | | | - Carlos José Saboia-Dantas
- Laboratory of Tissue Repair Research, Brain Storm Academy, Federal University of Uberlandia, Uberlândia, Minas Gerais Brazil
| | | | | | | | - Rosiane Nascimento Alves
- Department of Cell Biology, Histology and Embryology, Biomedical Science Institute, Federal University of Uberlandia, Avenida Pará 1720, Campus Umuarama, Bloco 2B, Bairro Umuarama, Uberlândia, Minas Gerais 38.400-902 Brazil
- Biological Sciences Course, State University of Minas Gerais, Ituiutaba, Minas Gerais Brazil
| | - Paula Dechichi
- Department of Cell Biology, Histology and Embryology, Biomedical Science Institute, Federal University of Uberlandia, Avenida Pará 1720, Campus Umuarama, Bloco 2B, Bairro Umuarama, Uberlândia, Minas Gerais 38.400-902 Brazil
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3
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Coronel-Meneses D, Sánchez-Trasviña C, Ratera I, Mayolo-Deloisa K. Strategies for surface coatings of implantable cardiac medical devices. Front Bioeng Biotechnol 2023; 11:1173260. [PMID: 37256118 PMCID: PMC10225971 DOI: 10.3389/fbioe.2023.1173260] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 04/25/2023] [Indexed: 06/01/2023] Open
Abstract
Cardiac medical devices (CMDs) are required when the patient's cardiac capacity or activity is compromised. To guarantee its correct functionality, the building materials in the development of CMDs must focus on several fundamental properties such as strength, stiffness, rigidity, corrosion resistance, etc. The challenge is more significant because CMDs are generally built with at least one metallic and one polymeric part. However, not only the properties of the materials need to be taken into consideration. The biocompatibility of the materials represents one of the major causes of the success of CMDs in the short and long term. Otherwise, the material will lead to several problems of hemocompatibility (e.g., protein adsorption, platelet aggregation, thrombus formation, bacterial infection, and finally, the rejection of the CMDs). To enhance the hemocompatibility of selected materials, surface modification represents a suitable solution. The surface modification involves the attachment of chemical compounds or bioactive compounds to the surface of the material. These coatings interact with the blood and avoid hemocompatibility and infection issues. This work reviews two main topics: 1) the materials employed in developing CMDs and their key characteristics, and 2) the surface modifications reported in the literature, clinical trials, and those that have reached the market. With the aim of providing to the research community, considerations regarding the choice of materials for CMDs, together with the advantages and disadvantages of the surface modifications and the limitations of the studies performed.
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Affiliation(s)
- David Coronel-Meneses
- Tecnologico de Monterrey, The Institute for Obesity Research, Monterrey, Mexico
- Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Centro de Biotecnología-FEMSA, Monterrey, Mexico
| | - Calef Sánchez-Trasviña
- Tecnologico de Monterrey, The Institute for Obesity Research, Monterrey, Mexico
- Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Centro de Biotecnología-FEMSA, Monterrey, Mexico
| | - Imma Ratera
- Institute of Materials Science of Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, Spain
- Centro de Investigación Biomédica en Red de Bioingeniería, Instituto de Salud Carlos IIIBellaterra, Spain
| | - Karla Mayolo-Deloisa
- Tecnologico de Monterrey, The Institute for Obesity Research, Monterrey, Mexico
- Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Centro de Biotecnología-FEMSA, Monterrey, Mexico
- Institute of Materials Science of Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, Spain
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4
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Ji H, Li Y, Su B, Zhao W, Kizhakkedathu JN, Zhao C. Advances in Enhancing Hemocompatibility of Hemodialysis Hollow-Fiber Membranes. ADVANCED FIBER MATERIALS 2023; 5:1-43. [PMID: 37361105 PMCID: PMC10068248 DOI: 10.1007/s42765-023-00277-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Accepted: 02/19/2023] [Indexed: 06/28/2023]
Abstract
Hemodialysis, the most common modality of renal replacement therapy, is critically required to remove uremic toxins from the blood of patients with end-stage kidney disease. However, the chronic inflammation, oxidative stress as well as thrombosis induced by the long-term contact of hemoincompatible hollow-fiber membranes (HFMs) contribute to the increase in cardiovascular diseases and mortality in this patient population. This review first retrospectively analyzes the current clinical and laboratory research progress in improving the hemocompatibility of HFMs. Details on different HFMs currently in clinical use and their design are described. Subsequently, we elaborate on the adverse interactions between blood and HFMs, involving protein adsorption, platelet adhesion and activation, and the activation of immune and coagulation systems, and the focus is on how to improve the hemocompatibility of HFMs in these aspects. Finally, challenges and future perspectives for improving the hemocompatibility of HFMs are also discussed to promote the development and clinical application of new hemocompatible HFMs. Graphical Abstract
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Affiliation(s)
- Haifeng Ji
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065 People’s Republic of China
- Department of Pathology and Lab Medicine & Center for Blood Research & Life Science Institute, 2350 Health Sciences Mall, Life Sciences Centre, The School of Biomedical Engineering, University of British Columbia, Vancouver, BC V6T 1Z3 Canada
| | - Yupei Li
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu, 610041 China
- Institute for Disaster Management and Reconstruction, Sichuan University, Chengdu, 610207 China
| | - Baihai Su
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu, 610041 China
| | - Weifeng Zhao
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065 People’s Republic of China
| | - Jayachandran N. Kizhakkedathu
- Department of Pathology and Lab Medicine & Center for Blood Research & Life Science Institute, 2350 Health Sciences Mall, Life Sciences Centre, The School of Biomedical Engineering, University of British Columbia, Vancouver, BC V6T 1Z3 Canada
| | - Changsheng Zhao
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065 People’s Republic of China
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5
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Chen MJ, Pappas GA, Massella D, Schlothauer A, Motta SE, Falk V, Cesarovic N, Ermanni P. Tailoring crystallinity for hemocompatible and durable PEEK cardiovascular implants. BIOMATERIALS ADVANCES 2023; 146:213288. [PMID: 36731379 DOI: 10.1016/j.bioadv.2023.213288] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 01/09/2023] [Accepted: 01/10/2023] [Indexed: 01/15/2023]
Abstract
Polymers have the potential to replace metallic or bioprosthetic heart valve components due to superior durability and inertness while allowing for native tissue-like flexibility. Despite these appealing properties, certain polymers such as polyetheretherketone (PEEK) have issues with hemocompatibility, which have previously been addressed through assorted complex processes. In this paper, we explore the enhancement of PEEK hemocompatibility with polymer crystallinity. Amorphous, semi-crystalline and crystalline PEEK are investigated in addition to a highly crystalline carbon fiber (CF)/PEEK composite material (CFPEEK). The functional group density of the PEEK samples is determined, showing that higher crystallinity results in increased amount of surface carbonyl functional groups. The increase of crystallinity (and negatively charged groups) appears to cause significant reductions in platelet adhesion (33 vs. 1.5 % surface coverage), hemolysis (1.55 vs. 0.75 %∙cm-2), and thrombin generation rate (4840 vs. 1585 mU/mL/min/cm2). In combination with the hemocompatibility study, mechanical characterization demonstrates that tailoring crystallinity is a simple and effective method to control both hemocompatibility and mechanical performance of PEEK. Furthermore, the results display that CFPEEK composite performed very well in all categories due to its enhanced crystallinity and complete carbon encapsulation, allowing the unique properties of CFPEEK to empower new concepts in cardiovascular device design.
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Affiliation(s)
- Mary Jialu Chen
- Laboratory of Composite Materials and Adaptive Structures, ETH Zürich, Switzerland.
| | - Georgios A Pappas
- Laboratory of Composite Materials and Adaptive Structures, ETH Zürich, Switzerland
| | - Daniele Massella
- Laboratory of Composite Materials and Adaptive Structures, ETH Zürich, Switzerland
| | - Arthur Schlothauer
- Laboratory of Composite Materials and Adaptive Structures, ETH Zürich, Switzerland
| | - Sarah E Motta
- Institute for Regenerative Medicine, University of Zürich, Switzerland
| | - Volkmar Falk
- Translational Cardiovascular Technologies, ETH Zürich, Switzerland; Klinik für Herz-, Thorax- und Gefäßchirurgie, Deutsches Herzzentrum Berlin, Germany; Klinik für Kardiovaskuläre Chirurgie, Charité Universitätsmedizin Berlin, Germany
| | - Nikola Cesarovic
- Translational Cardiovascular Technologies, ETH Zürich, Switzerland; Klinik für Herz-, Thorax- und Gefäßchirurgie, Deutsches Herzzentrum Berlin, Germany
| | - Paolo Ermanni
- Laboratory of Composite Materials and Adaptive Structures, ETH Zürich, Switzerland
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6
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Hong JK, Ruhoff AM, Mathur K, Neto C, Waterhouse A. Mechanisms for Reduced Fibrin Clot Formation on Liquid-Infused Surfaces. Adv Healthc Mater 2022; 11:e2201360. [PMID: 36040004 DOI: 10.1002/adhm.202201360] [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: 06/06/2022] [Revised: 08/09/2022] [Indexed: 01/28/2023]
Abstract
Biomedical devices are prone to blood clot formation (thrombosis), and liquid-infused surfaces (LIS) are effective in reducing the thrombotic response. However, the mechanisms that underpin this performance, and in particular the role of the lubricant, are not well understood. In this work, it is investigated whether the mechanism of LIS action is related to i) inhibition of factor XII (FXII) activation and the contact pathway; ii) reduced fibrin density of clots formed on surfaces; iii) increased mobility of proteins or cells on the surface due to the interfacial flow of the lubricant. The chosen LIS is covalently tethered, nanostructured layers of perfluorocarbons, infused with thin films of medical-grade perfluorodecalin (tethered-liquid perfluorocarbon), prepared with chemical vapor deposition previously optimized to retain lubricant under flow. Results show that in the absence of external flow, interfacial mobility is inherently higher at the liquid-blood interface, making it a key contributor to the low thrombogenicity of LIS, as FXII activity and fibrin density are equivalent at the interface. The findings of this study advance the understanding of the anti-thrombotic behavior of LIS-coated biomedical devices for future coating design. More broadly, enhanced interfacial mobility may be an important, underexplored mechanism for the anti-fouling behavior of surface coatings.
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Affiliation(s)
- Jun Ki Hong
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia.,School of Medical Science, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW 2006, Australia.,Heart Research Institute, The University of Sydney, Newtown, NSW 2042, Australia.,The University of Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia.,The Charles Perkins Centre, The University of Sydney, Sydney, NSW 2006, Australia
| | - Alexander M Ruhoff
- Heart Research Institute, The University of Sydney, Newtown, NSW 2042, Australia.,The Charles Perkins Centre, The University of Sydney, Sydney, NSW 2006, Australia.,Faculty of Medicine and Health, The University of Sydney, Sydney, NSW 2006, Australia
| | - Kavya Mathur
- Heart Research Institute, The University of Sydney, Newtown, NSW 2042, Australia.,The Charles Perkins Centre, The University of Sydney, Sydney, NSW 2006, Australia.,School of Biomedical Engineering, Faculty of Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Chiara Neto
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia.,The University of Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Anna Waterhouse
- School of Medical Science, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW 2006, Australia.,Heart Research Institute, The University of Sydney, Newtown, NSW 2042, Australia.,The University of Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia.,The Charles Perkins Centre, The University of Sydney, Sydney, NSW 2006, Australia
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7
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Horn JD, Maitland DJ, Hartman J, Ortega JM. Computational study of clot formation in aneurysms treated with shape memory polymer foam. Med Eng Phys 2020; 75:65-71. [DOI: 10.1016/j.medengphy.2019.10.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 09/13/2019] [Accepted: 10/14/2019] [Indexed: 11/26/2022]
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8
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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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9
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Sabek J, Torrijos-Morán L, Griol A, Díaz Betancor Z, Bañuls Polo MJ, Maquieira Á, García-Rupérez J. Real Time Monitoring of a UV Light-Assisted Biofunctionalization Protocol Using a Nanophotonic Biosensor. BIOSENSORS-BASEL 2018; 9:bios9010006. [PMID: 30598030 PMCID: PMC6468802 DOI: 10.3390/bios9010006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 12/12/2018] [Accepted: 12/24/2018] [Indexed: 12/27/2022]
Abstract
A protocol for the covalent biofunctionalization of silicon-based biosensors using a UV light-induced thiol–ene coupling (TEC) reaction has been developed. This biofunctionalization approach has been used to immobilize half antibodies (hIgG), which have been obtained by means of a tris(2-carboxyethyl)phosphine (TCEP) reduction at the hinge region, to the surface of a vinyl-activated silicon-on-insulator (SOI) nanophotonic sensing chip. The response of the sensing structures within the nanophotonic chip was monitored in real time during the biofunctionalization process, which has allowed us to confirm that the bioconjugation of the thiol-terminated bioreceptors onto the vinyl-activated sensing surface is only initiated upon UV light photocatalysis.
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Affiliation(s)
- Jad Sabek
- Nanophotonics Technology Center, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - Luis Torrijos-Morán
- Nanophotonics Technology Center, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - Amadeu Griol
- Nanophotonics Technology Center, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - Zeneida Díaz Betancor
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - María-José Bañuls Polo
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - Ángel Maquieira
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - Jaime García-Rupérez
- Nanophotonics Technology Center, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
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10
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Horn JD, Maitland DJ, Hartman J, Ortega JM. A computational thrombus formation model: application to an idealized two-dimensional aneurysm treated with bare metal coils. Biomech Model Mechanobiol 2018; 17:1821-1838. [DOI: 10.1007/s10237-018-1059-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 07/21/2018] [Indexed: 10/28/2022]
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11
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Xu LC, Li Z, Tian Z, Chen C, Allcock HR, Siedlecki CA. A new textured polyphosphazene biomaterial with improved blood coagulation and microbial infection responses. Acta Biomater 2018; 67:87-98. [PMID: 29229544 DOI: 10.1016/j.actbio.2017.11.056] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 11/20/2017] [Accepted: 11/30/2017] [Indexed: 12/16/2022]
Abstract
A new poly[bis(octafluoropentoxy) phosphazene] (OFP) was synthesized for the purpose of blood contacting medical devices. OFP was further either developed into crosslinkable polyphosphazene (X-OFP) or blended with polyurethane (PU) as the mixture (OFP/PU) for improvement of mechanical property of polyphosphazene polymers. All the materials were fabricated as smooth films or further textured with submicron pillars for the assay of antimicrobial and antithrombotic properties. Results showed that crosslinkable OFP (X-OFP) and blends of OFP/PU successfully improved the mechanical strength of OFP and fewer defects of pillars were found on the textured polyphosphazene surfaces. The antithrombotic experiments showed that polyphosphazene OFP materials reduced human Factor XII activation and platelet adhesion, thereby being resistant to plasma coagulation and thrombosis. The bacterial adhesion and biofilm experiments demonstrated that OFP materials inhibited staphylococcal bacterial adhesion and biofilm formation. The surface texturing further reduced the platelet adhesion and bacterial adhesion, and inhibited biofilm formation up to 23 days. The data suggested that textured OFP materials may provide a practical approach to improve the biocompatibility of current biomaterials in the application of blood contacting medical devices with significant reduction in risk of pathogenic infection and thrombosis. STATEMENT OF SIGNIFICANCE The thromboembolic events and microbial infection have been the significant barriers for the long term use of biomaterials in blood-contacting medical devices. The development of new materials with multiple functions including anti-thrombosis and antibacterial surfaces is a high research priority. This study synthesized new biostable and biocompatible polyphosphazene polymers, poly[bis(octafluoropentoxy)phosphazene] (OFP) and crosslinkable OFP, and successfully improved the mechanical strength of polyphosphazenes. Polymers were fabricated into textured films with submicron pillars on the surfaces. The antimicrobial and antithrombotic assays demonstrated that new materials combined with surface physical modification have significant reduction in risk of pathogenic infection and thrombosis, and improve the biocompatibility of current biomaterials in the application of blood-contacting medical devices. It would be interest to biomaterials and bioengineering related communities.
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Affiliation(s)
- Li-Chong Xu
- Department of Surgery, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States.
| | - Zhongjing Li
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, United States
| | - Zhicheng Tian
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, United States
| | - Chen Chen
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, United States
| | - Harry R Allcock
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, United States
| | - Christopher A Siedlecki
- Department of Surgery, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States; Department of Bioengineering, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
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12
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Terent’eva VA, Sveshnikova AN, Panteleev MA. Biophysical mechanisms of contact activation of blood-plasma clotting. Biophysics (Nagoya-shi) 2017. [DOI: 10.1134/s0006350917050232] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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13
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Lu L, Xing C, Xin S, Shitao Y, Feng S, Shiwei L, Fusheng L, Congxia X. Alkyl chitosan film-high strength, functional biomaterials. J Biomed Mater Res A 2017; 105:3034-3041. [DOI: 10.1002/jbm.a.36163] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 06/07/2017] [Accepted: 07/28/2017] [Indexed: 12/13/2022]
Affiliation(s)
- Li Lu
- College of Chemical Engineering; Qingdao University of Science and Technology; Qingdao People's Republic of China
- Department of Materials Science and Engineering; The Pennsylvania State University, University Park; Pennsylvania 16802
- Department of Bioengineering; The Pennsylvania State University, University Park; Pennsylvania 16802
| | - Cao Xing
- College of Chemical Engineering; Qingdao University of Science and Technology; Qingdao People's Republic of China
| | - Shen Xin
- College of Polymer Science and Engineering; Qingdao University of Science and Technology; Qingdao People's Republic of China
| | - Yu Shitao
- College of Chemical Engineering; Qingdao University of Science and Technology; Qingdao People's Republic of China
| | - Su Feng
- College of Chemical Engineering; Qingdao University of Science and Technology; Qingdao People's Republic of China
| | - Liu Shiwei
- College of Chemical Engineering; Qingdao University of Science and Technology; Qingdao People's Republic of China
| | - Liu Fusheng
- College of Chemical Engineering; Qingdao University of Science and Technology; Qingdao People's Republic of China
| | - Xie Congxia
- Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering; Qingdao University of Science and Technology; Qingdao People's Republic of China
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Bauer JW, Xu LC, Vogler EA, Siedlecki CA. Surface dependent contact activation of factor XII and blood plasma coagulation induced by mixed thiol surfaces. Biointerphases 2017; 12:02D410. [PMID: 28514863 PMCID: PMC5435513 DOI: 10.1116/1.4983634] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 04/27/2017] [Accepted: 05/04/2017] [Indexed: 12/20/2022] Open
Abstract
Studies of the activation of FXII in both platelet poor plasma and in neat buffer solutions were undertaken for a series of mixed thiol self-assembled monolayers spanning a broad range of water wettability. A wide spectrum of carboxyl/methyl-, hydroxyl/methyl-, and amine/methyl-thiol modified surfaces were prepared, characterized, and then utilized as the procoagulant materials in a series of FXII activation studies. X-ray photoelectron spectroscopy was utilized to verify the sample surface's thiol composition and contact angles measured to determine the sample surface's wettability. These samples were then used in in vitro coagulation assays using a 50% mixture of recalcified plasma in phosphate buffered saline. Alternatively, the samples were placed into purified FXII solutions for 30 min to assess FXII activation in neat buffer solution. Plasma coagulation studies supported a strong role for anionic surfaces in contact activation, in line with the traditional models of coagulation, while the activation results in neat buffer solution demonstrated that FXIIa production is related to surface wettability with minimum levels of enzyme activation observed at midrange wettabilities, and no statistically distinguishable differences in FXII activation seen between highly wettable and highly nonwettable surfaces. Results demonstrated that the composition of the solution and the surface properties of the material all contribute to the observation of contact activation, and the activation of FXII is not specific to anionic surfaces as has been long believed.
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Affiliation(s)
- James W Bauer
- Department of Bioengineering, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033
| | - Li-Chong Xu
- Department of Surgery, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033
| | - Erwin A Vogler
- Department of Bioengineering, Pennsylvania State University, University Park, Pennsylvania 16802 and Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802
| | - Christopher A Siedlecki
- Department of Bioengineering, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033 and Department of Surgery, Pennsylvania State University College of Medicine, 500 University Drive, H151, Hershey, Pennsylvania 17033
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15
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Terentyeva VA, Sveshnikova AN, Panteleev MA. Kinetics and mechanisms of surface-dependent coagulation factor XII activation. J Theor Biol 2015; 382:235-43. [DOI: 10.1016/j.jtbi.2015.07.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 06/30/2015] [Accepted: 07/06/2015] [Indexed: 11/29/2022]
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16
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Enzymes produced by autoactivation of blood factor XII in buffer. Biomaterials 2015; 37:1-12. [DOI: 10.1016/j.biomaterials.2014.09.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Accepted: 09/15/2014] [Indexed: 10/24/2022]
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17
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Xu LC, Bauer JW, Siedlecki CA. Proteins, platelets, and blood coagulation at biomaterial interfaces. Colloids Surf B Biointerfaces 2014; 124:49-68. [PMID: 25448722 PMCID: PMC5001692 DOI: 10.1016/j.colsurfb.2014.09.040] [Citation(s) in RCA: 248] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 09/15/2014] [Accepted: 09/18/2014] [Indexed: 12/24/2022]
Abstract
Blood coagulation and platelet adhesion remain major impediments to the use of biomaterials in implantable medical devices. There is still significant controversy and question in the field regarding the role that surfaces play in this process. This manuscript addresses this topic area and reports on state of the art in the field. Particular emphasis is placed on the subject of surface engineering and surface measurements that allow for control and observation of surface-mediated biological responses in blood and test solutions. Appropriate use of surface texturing and chemical patterning methodologies allow for reduction of both blood coagulation and platelet adhesion, and new methods of surface interrogation at high resolution allow for measurement of the relevant biological factors.
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Affiliation(s)
- Li-Chong Xu
- Department of Surgery, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - James W Bauer
- Department of Bioengineering, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - Christopher A Siedlecki
- Department of Surgery, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States; Department of Bioengineering, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States.
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Girdhar G, Read M, Sohn J, Shah C, Shrivastava S. In-vitro thrombogenicity assessment of polymer filament modified and native platinum embolic coils. J Neurol Sci 2014; 339:97-101. [DOI: 10.1016/j.jns.2014.01.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 12/28/2013] [Accepted: 01/22/2014] [Indexed: 10/25/2022]
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19
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Chiu JM, Tai Y. Improving the efficiency of ZnO-based organic solar cell by self-assembled monolayer assisted modulation on the properties of ZnO acceptor layer. ACS APPLIED MATERIALS & INTERFACES 2013; 5:6946-6950. [PMID: 23895177 DOI: 10.1021/am400928n] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this study, we fabricated a bilayer hybrid organic solar cell with P3HT as the donor and ZnO as the acceptor (ITO/ZnO/P3HT/Au). We show that passivating a self-assembled monolayer (SAM) over the ITO electrode surface before fabricating the ZnO layer improves the crystallinity of the ZnO layer and of the P3HT layer spin-coated on top of the ZnO layer. The SAM modification resulted in improved charge mobility in the ZnO and P3HT layers. As a consequence, the short circuit current of the photovoltaic device were enhanced. The power conversion efficiency of the SAM-modified device was approximately 60% higher than that of the untreated device. Our findings suggest that the performance of metal oxide-based organic solar cells can be improved by SAM-assisted modulation of metal oxide crystallinity.
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Affiliation(s)
- Jian-Ming Chiu
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
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20
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Krishnan A, Vogler EA, Sullenger BA, Becker RC. The effect of surface contact activation and temperature on plasma coagulation with an RNA aptamer directed against factor IXa. J Thromb Thrombolysis 2013; 35:48-56. [PMID: 23054460 DOI: 10.1007/s11239-012-0778-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The anticoagulant properties of a novel RNA aptamer that binds FIXa depend collectively on the intensity of surface contact activation of human blood plasma, aptamer concentration, and its binding affinity for FIXa. Accordingly, anticoagulation efficiency of plasma containing any particular aptamer concentration is low when coagulation is strongly activated by hydrophilic surfaces compared to the anticoagulation efficiency in plasma that is weakly activated by hydrophobic surfaces. Anticoagulation efficiency is lower at hypothermic temperatures possibly because aptamer-FIXa binding decreases with decreasing temperatures. Experimental results demonstrating these trends are qualitatively interpreted in the context of a previously established model of anticoagulation efficiency of thrombin-binding DNA aptamers that exhibit anticoagulation properties similar to the FIXa aptamer. In principle, FIXa aptamer anticoagulants should be more efficient and therefore more clinically useful than thrombin-binding aptamers because aptamer binding to FIXa competes only with FX that is at much lower blood concentration than fibrinogen (FI) that competes with thrombin-binding aptamers. Our findings may have translatable relevance in the application of aptamer anticoagulants for clinical conditions in which blood is in direct contact with non-biological surfaces such as those encountered in cardiopulmonary bypass circuits.
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Affiliation(s)
- Anandi Krishnan
- Duke Clinical Research Institute, Duke University Medical Center, 2400 Pratt Street, Box 3850, Durham, NC 27705, USA.
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Golas A, Yeh CHJ, Pitakjakpipop H, Siedlecki CA, Vogler EA. A comparison of blood factor XII autoactivation in buffer, protein cocktail, serum, and plasma solutions. Biomaterials 2012; 34:607-20. [PMID: 23117212 DOI: 10.1016/j.biomaterials.2012.09.034] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Accepted: 09/16/2012] [Indexed: 11/18/2022]
Abstract
Activation of blood plasma coagulation in vitro by contact with material surfaces is demonstrably dependent on plasma-volume-to-activator-surface-area ratio. The only plausible explanation consistent with current understanding of coagulation-cascade biochemistry is that procoagulant stimulus arising from the activation complex of the intrinsic pathway is dependent on activator surface area. And yet, it is herein shown that activation of the blood zymogen factor XII (Hageman factor, FXII) dissolved in buffer, protein cocktail, heat-denatured serum, and FXI deficient plasma does not exhibit activator surface-area dependence. Instead, a highly-variable burst of procoagulant-enzyme yield is measured that exhibits no measurable kinetics, sensitivity to mixing, or solution-temperature dependence. Thus, FXII activation in both buffer and protein-containing solutions does not exhibit characteristics of a biochemical reaction but rather appears to be a "mechanochemical" reaction induced by FXII molecule interactions with hydrophilic activator particles that do not formally adsorb blood proteins from solution. Results of this study strongly suggest that activator surface-area dependence observed in contact activation of plasma coagulation does not solely arise at the FXII activation step of the intrinsic pathway.
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Affiliation(s)
- Avantika Golas
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA
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Zhao J, Shi Q, Luan S, Song L, Yang H, Stagnaro P, Yin J. Polypropylene non-woven fabric membrane via surface modification with biomimetic phosphorylcholine in Ce(IV)/HNO3 redox system. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2012; 32:1785-1789. [DOI: 10.1016/j.msec.2012.04.057] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 02/21/2012] [Accepted: 04/22/2012] [Indexed: 11/24/2022]
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23
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Shi Q, Zhao J, Stagnaro P, Yang H, Luan S, Yin J. Biocompatible polypropylene prepared by a combination of melt grafting and surface restructuring. J Appl Polym Sci 2012. [DOI: 10.1002/app.36641] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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24
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Modulation of C1-Inhibitor and Plasma Kallikrein Activities by Type IV Collagen. Int J Biomater 2012; 2012:212417. [PMID: 22481936 PMCID: PMC3296203 DOI: 10.1155/2012/212417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Accepted: 11/10/2011] [Indexed: 11/23/2022] Open
Abstract
The contact system of coagulation can be activated when in contact with biomaterials. As collagen is being tested in novel biomaterials in this study, we have investigated how type IV collagen affects plasma kallikrein and C1-inhibitor. Firstly, we showed C1-inhibitor binds to type IV collagen with a Kd of 0.86 μM. The effects of type IV collagen on plasma kallikrein, factor XIIa, and β-factor XIIa activity and on C1-inhibitor function were determined. Factor XIIa rapidly lost activity in the presence of type IV collagen, whereas plasma kallikrein and β-factor XIIa were more stable. The rate of inhibition of plasma kallikrein by C1-inhibitor was decreased by type IV collagen in a dose-dependent manner. These studies could be relevant to the properties of biomaterials, which contain collagen, and should be considered in the testing for biocompatibility.
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Abstract
Recent experimental and theoretical work clarifying the physical chemistry of blood-protein adsorption from aqueous-buffer solution to various kinds of surfaces is reviewed and interpreted within the context of biomaterial applications, especially toward development of cardiovascular biomaterials. The importance of this subject in biomaterials surface science is emphasized by reducing the "protein-adsorption problem" to three core questions that require quantitative answer. An overview of the protein-adsorption literature identifies some of the sources of inconsistency among many investigators participating in more than five decades of focused research. A tutorial on the fundamental biophysical chemistry of protein adsorption sets the stage for a detailed discussion of the kinetics and thermodynamics of protein adsorption, including adsorption competition between two proteins for the same adsorbent immersed in a binary-protein mixture. Both kinetics and steady-state adsorption can be rationalized using a single interpretive paradigm asserting that protein molecules partition from solution into a three-dimensional (3D) interphase separating bulk solution from the physical-adsorbent surface. Adsorbed protein collects in one-or-more adsorbed layers, depending on protein size, solution concentration, and adsorbent surface energy (water wettability). The adsorption process begins with the hydration of an adsorbent surface brought into contact with an aqueous-protein solution. Surface hydration reactions instantaneously form a thin, pseudo-2D interface between the adsorbent and protein solution. Protein molecules rapidly diffuse into this newly formed interface, creating a truly 3D interphase that inflates with arriving proteins and fills to capacity within milliseconds at mg/mL bulk-solution concentrations C(B). This inflated interphase subsequently undergoes time-dependent (minutes-to-hours) decrease in volume V(I) by expulsion of either-or-both interphase water and initially adsorbed protein. Interphase protein concentration C(I) increases as V(I) decreases, resulting in slow reduction in interfacial energetics. Steady state is governed by a net partition coefficient P=(C(I)/C(B)). In the process of occupying space within the interphase, adsorbing protein molecules must displace an equivalent volume of interphase water. Interphase water is itself associated with surface-bound water through a network of transient hydrogen bonds. Displacement of interphase water thus requires an amount of energy that depends on the adsorbent surface chemistry/energy. This "adsorption-dehydration" step is the significant free energy cost of adsorption that controls the maximum amount of protein that can be adsorbed at steady state to a unit adsorbent surface area (the adsorbent capacity). As adsorbent hydrophilicity increases, adsorbent capacity monotonically decreases because the energetic cost of surface dehydration increases, ultimately leading to no protein adsorption near an adsorbent water wettability (surface energy) characterized by a water contact angle θ→65(°). Consequently, protein does not adsorb (accumulate at interphase concentrations greater than bulk solution) to more hydrophilic adsorbents exhibiting θ<65(°). For adsorbents bearing strong Lewis acid/base chemistry such as ion-exchange resins, protein/surface interactions can be highly favorable, causing protein to adsorb in multilayers in a relatively thick interphase. A straightforward, three-component free energy relationship captures salient features of protein adsorption to all surfaces predicting that the overall free energy of protein adsorption ΔG(ads)(o) is a relatively small multiple of thermal energy for any surface chemistry (except perhaps for bioengineered surfaces bearing specific ligands for adsorbing protein) because a surface chemistry that interacts chemically with proteins must also interact with water through hydrogen bonding. In this way, water moderates protein adsorption to any surface by competing with adsorbing protein molecules. This Leading Opinion ends by proposing several changes to the protein-adsorption paradigm that might advance answers to the three core questions that frame the "protein-adsorption problem" that is so fundamental to biomaterials surface science.
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Affiliation(s)
- Erwin A Vogler
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
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26
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Josh Yeh CH, Dimachkie ZO, Golas A, Cheng A, Parhi P, Vogler EA. Contact activation of blood plasma and factor XII by ion-exchange resins. Biomaterials 2011; 33:9-19. [PMID: 21982294 DOI: 10.1016/j.biomaterials.2011.09.034] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Accepted: 09/14/2011] [Indexed: 11/26/2022]
Abstract
Sepharose ion-exchange particles bearing strong Lewis acid/base functional groups (sulfopropyl, carboxymethyl, quaternary ammonium, dimethyl aminoethyl, and iminodiacetic acid) exhibiting high plasma protein adsorbent capacities are shown to be more efficient activators of blood factor XII in neat-buffer solution than either hydrophilic clean-glass particles or hydrophobic octyl sepharose particles (FXII (activator)→(surface) FXIIa; a.k.a autoactivation, where FXII is the zymogen and FXIIa is a procoagulant protease). In sharp contrast to the clean-glass standard of comparison, ion-exchange activators are shown to be inefficient activators of blood plasma coagulation. These contrasting activation properties are proposed to be due to the moderating effect of plasma-protein adsorption on plasma coagulation. Efficient adsorption of blood-plasma proteins unrelated to the coagulation cascade impedes FXII contacts with ion-exchange particles immersed in plasma, reducing autoactivation, and causing sluggish plasma coagulation. By contrast, plasma proteins do not adsorb to hydrophilic clean glass and efficient autoactivation leads directly to efficient activation of plasma coagulation. It is also shown that competitive-protein adsorption can displace FXIIa adsorbed to the surface of ion-exchange resins. As a consequence of highly-efficient autoactivation and FXIIa displacement by plasma proteins, ion-exchange particles are slightly more efficient activators of plasma coagulation than hydrophobic octyl sepharose particles that do not bear strong Lewis acid/base surface functionalities but to which plasma proteins adsorb efficiently. Plasma proteins thus play a dual role in moderating contact activation of the plasma coagulation cascade. The principal role is impeding FXII contact with activating surfaces, but this same effect can displace FXIIa from an activating surface into solution where the protease can potentiate subsequent steps of the plasma coagulation cascade.
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Affiliation(s)
- Chyi-Huey Josh Yeh
- Departments of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA
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Golas A, Yeh CHJ, Siedlecki CA, Vogler EA. Amidolytic, procoagulant, and activation-suppressing proteins produced by contact activation of blood factor XII in buffer solution. Biomaterials 2011; 32:9747-57. [PMID: 21955686 DOI: 10.1016/j.biomaterials.2011.09.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Accepted: 09/07/2011] [Indexed: 11/27/2022]
Abstract
The relative proportions of enzymes with amidolytic or procoagulant activity produced by contact activation of the blood zymogen factor XII (FXII, Hageman factor) in buffer solution depends on activator surface chemistry/energy. As a consequence, chromogenic assay of amidolytic activity (cleavage of amino acid bonds in s-2302 chromogen) does not correlate with the traditional plasma coagulation time assay for procoagulant activity (protease activity inducing clotting of blood plasma). Amidolytic activity did not vary significantly with activator particle surface energy, herein measured as water adhesion tension τ(o)=γ(lv)(o)cosθ(a) ; where γ(lv)(o) is pure buffer interfacial tension and θ(a) is the advancing contact angle. By contrast, procoagulant activity varied as a parabolic-like function of τ(o), high at both hydrophobic and hydrophilic extremes of activator surface energy and falling through a broad minimum within a 20<τ(o)<40 mJ/m(2) (55°<θ(a) < 75°) range, corroborating and expanding previously-published work. It is inferred from these functional assays that an unknown number of protein fragments are produced by contact activation of FXII (a.k.a. autoactivation) rather than just αFXIIa and βFXIIa as popularly believed. Autoactivation products produced by activator particles within the 20<τ(o)<40 mJ/m(2) (55°<θ(a) < 75°) surface-energy range suppresses production of procoagulant enzymes by activators selected from the hydrophobic or hydrophilic surface-energy extremes through as-yet unknown biophysical chemistry. Suppression proteins may be responsible for the experimentally-observed autoinhibition of the autoactivation reaction.
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Affiliation(s)
- Avantika Golas
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA
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Abstract
A minimum in the biological response to materials that is observed to occur within a narrow surface energy range is related to the properties of water at these biology-contacting surfaces. Wetting energetics are calculated using a published theory from which it is further estimated that water molecules bind to these special surfaces through a single hydrogen bond, leaving three other hydrogen bonds to interact with proximal water molecules. It is concluded that, at this Goldilocks Surface, the local chemical environment of surface-bound water is nearly identical to that experienced in bulk water; neither deprived of hydrogen bond opportunities, as it is in contact with a more hydrophobic surface, nor excessively hydrogen bonded to a more hydrophilic surface. A minimum in the biological response occurs because water vicinal (near) to the Goldilocks Surface is not chemically different than bulk water. A more precise definition of the relative terms hydrophobic and hydrophilic for use in biomaterials becomes evident from calculations: >1.3 kJ/mole-of-surface-sites is expended in wetting a hydrophilic surface whereas <1.3 kJ/mole-of-surface-sites is expended in wetting hydrophobic surfaces; hydrophilic surfaces wet with >1 hydrogen bond per water molecule whereas hydrophobic surfaces wet with <1 hydrogen bond per water molecule.
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Affiliation(s)
- Erwin A Vogler
- Departments of Materials Science and Engineering and Bioengineering, The Pennsylvania State University, University Park, PA 16802, USA.
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