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Yan S, Qiu Y. Improving Hemocompatibility of Polysulfone Membrane by UV-Assisted Grafting of Sulfonated Chitosan. Polymers (Basel) 2024; 16:1555. [PMID: 38891507 PMCID: PMC11174723 DOI: 10.3390/polym16111555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2024] [Revised: 05/22/2024] [Accepted: 05/29/2024] [Indexed: 06/21/2024] Open
Abstract
The most prevalent type of hemodialysis membrane is polysulfone (PSf). However, due to inadequate biocompatibility, it significantly compromises the safety of dialysis for patients. In this study, we modify the surface of the PSf membrane with 2,4-dihydroxybenzophenone (DBPh) groups to serve as anchoring sites during UV irradiation. Subsequently, a tailored sulfonated dihydroxy propyl chitosan (SDHPCS) is grafted onto the modified PSf membrane to compensate for the deficiencies in hydrophilic additives. The modified PSf membrane exhibits outstanding hydrophilicity and stability, as demonstrated by its characterization and evaluation. This paper focuses on investigating the interaction between platelet membrane formation, protein adsorption, and anticoagulant activity. The results show that the modified PSf membrane exhibits remarkable enhancement in surface hydrophilicity, leading to a significant reduction in protein and platelet adsorption as well as adhesion.
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Affiliation(s)
| | - Yunren Qiu
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
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2
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Pumford EA, Rahman SM, Hlady V. Effect of upstream priming on transient downstream platelet-substrate interactions. Colloids Surf B Biointerfaces 2021; 206:111925. [PMID: 34175742 PMCID: PMC8429184 DOI: 10.1016/j.colsurfb.2021.111925] [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: 03/08/2021] [Revised: 06/04/2021] [Accepted: 06/14/2021] [Indexed: 11/23/2022]
Abstract
Upstream exposure of platelets to activating proteins 'primes' platelets for increased downstream adhesion, though the mechanics of platelet translocation before permanently arresting are not well understood. To investigate platelet translocation on platelet-binding proteins, primed platelets' transient contacts with immobilized proteins were recorded and analyzed. Using a microfluidic channel, representative of a vascular graft, platelet-activating proteins were covalently attached to the upstream priming, center, and downstream capture positions. Image sequences of platelet interactions with the center protein were captured as platelet-rich plasma (PRP) was perfused through the channel. There was an increase in both platelet pause events and net platelet adhesion on von Willebrand factor, collagen, or fibrinogen following upstream exposure to the same protein. Upstream priming also caused a decrease in average platelet velocity. The duration of transient platelet arrests on the protein-coated surface and the distance that platelets travel between pause events depended on the protein with which they were interacting. The most significant increase in platelet pause events frequency and decrease in average velocity occurred on immobilized von Willebrand factor, compared to the control with no upstream priming. These results demonstrate that platelet priming increases downstream platelet-protein interactions prior to permanent adhesion.
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Affiliation(s)
- Elizabeth Anne Pumford
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, 84112, USA
| | - Shekh Mojibur Rahman
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, 84112, USA
| | - Vladimir Hlady
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, 84112, USA.
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Rahman S, Fogelson A, Hlady V. Effects of elapsed time on downstream platelet adhesion following transient exposure to elevated upstream shear forces. Colloids Surf B Biointerfaces 2020; 193:111118. [DOI: 10.1016/j.colsurfb.2020.111118] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 05/05/2020] [Accepted: 05/06/2020] [Indexed: 02/06/2023]
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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: 42] [Impact Index Per Article: 8.4] [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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Bocci MG, Nardi G, Veronesi G, Rondinelli MB, Palma A, Fiore V, De Candia E, Bianchi M, Maresca M, Barelli R, Tersali A, Dell'Anna AM, De Pascale G, Cutuli SL, Mercurio G, Caricato A, Grieco DL, Antonelli M, Cingolani E. Early coagulation support protocol: A valid approach in real-life management of major trauma patients. Results from two Italian centres. Injury 2019; 50:1671-1677. [PMID: 31690405 DOI: 10.1016/j.injury.2019.09.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 09/18/2019] [Accepted: 09/20/2019] [Indexed: 02/02/2023]
Abstract
INTRODUCTION Early coagulation support (ECS) includes prompt infusion of tranexamic acid, fibrinogen concentrate, and packed red blood cells for initial resuscitation of major trauma patients. The aim of this study was to determine the effects, in terms of blood product consumption, length of stay, and in-hospital mortality, of the ECS protocol, compared to the massive transfusion protocol (MTP) in the treatment of major trauma patients. PATIENTS AND METHODS A retrospective analysis was conducted using the registry data of two Italian trauma centres. Adult major trauma patients with, or at risk of, active bleeding who were managed according to the MTP during the years 2011-2012, or the ECS protocol during the years 2013-2014 and were considered at risk of multiple transfusions, were enrolled. The primary endpoint was to determine whether the ECS protocol reduces the use of blood products in the acute management of trauma patients. Secondary endpoints were the outcome measures of length of stay in ICU, length of stay in hospital, and mortality at 24-hours and 28-days after hospital admission. RESULTS Among the 518 major trauma patients admitted to the trauma centres during the study period, 235 patients (118 in the pre-ECS period and 117 in the ECS period) matched one of the inclusion criteria and were enrolled in the study. Compared with the pre-ECS period, the ECS period showed a reduction in the average consumption of packed red blood cells (-1.87 units, 95% confidence interval [CI], -2.40, -1.34), platelets (-1.28 units; 95% CI, -1.64, -0.91), and fresh frozen plasma (-1.69; 95% CI, -2.14, -1.25) in the first 24-hours. Furthermore, during the ECS period, we recorded a 10-day reduction in the hospital length of stay (-10 days, 95% CI, -11.6, -8.4) and a non-significant 28-day mortality increase. CONCLUSIONS The ECS protocol was effective in reducing blood product consumption compared to the MTP and confirmed the importance of early fibrinogen administration as a strategy of rapid coagulation. This novel approach may be adopted in real-life management of major trauma patients.
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Affiliation(s)
- Maria Grazia Bocci
- Dipartimento di Scienze dell'Emergenza, Anestesiologiche e della Rianimazione, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Anestesiologia e Rianimazione, Università Cattolica del sacro Cuore, Rome, Italy.
| | - Giuseppe Nardi
- UOC Anestesia e Rianimazione, Ospedale Infermi, Rimini, Italy
| | - Giovanni Veronesi
- Centro Ricerche in Epidemiologia e Medicina Preventiva, Dipartimento di Medicina Clinica e Sperimentale, Università degli Studi dell'Insubria, Varese, Italy
| | - Maria Beatrice Rondinelli
- UOC Medicina Trasfusionale e Cellule Staminali, Azienda Ospedaliera San Camillo Forlanini, Rome, Italy
| | - Antonella Palma
- UOC Anestesia e Rianimazione, CTO Azienda Ospedaliera dei Colli, Napoli, Italy
| | - Valentina Fiore
- UOC Anestesia e Rianimazione, Azienda Ospedaliera Vito Fazi, Lecce, Italy
| | - Erica De Candia
- UOS Malattie Emorragiche e Trombotiche, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Medicina Interna e Geriatria, Università Cattolica del sacro Cuore, Rome, Italy
| | - Maria Bianchi
- UOC Emotrasfusione, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Ematologia, Università Cattolica del sacro Cuore, Rome, Italy
| | - Maddalena Maresca
- UOC Emotrasfusione, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Ematologia, Università Cattolica del sacro Cuore, Rome, Italy
| | - Roberta Barelli
- UOC Anestesia e Rianimazione, Ospedale San Giovanni Calibita Fatebenefratelli, Rome, Italy
| | - Alessandra Tersali
- Dipartimento di Scienze dell'Emergenza, Anestesiologiche e della Rianimazione, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Anestesiologia e Rianimazione, Università Cattolica del sacro Cuore, Rome, Italy
| | - Antonio Maria Dell'Anna
- Dipartimento di Scienze dell'Emergenza, Anestesiologiche e della Rianimazione, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Anestesiologia e Rianimazione, Università Cattolica del sacro Cuore, Rome, Italy
| | - Gennaro De Pascale
- Dipartimento di Scienze dell'Emergenza, Anestesiologiche e della Rianimazione, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Anestesiologia e Rianimazione, Università Cattolica del sacro Cuore, Rome, Italy
| | - Salvatore Lucio Cutuli
- Dipartimento di Scienze dell'Emergenza, Anestesiologiche e della Rianimazione, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Anestesiologia e Rianimazione, Università Cattolica del sacro Cuore, Rome, Italy
| | - Giovanna Mercurio
- Dipartimento di Scienze dell'Emergenza, Anestesiologiche e della Rianimazione, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Anestesiologia e Rianimazione, Università Cattolica del sacro Cuore, Rome, Italy
| | - Anselmo Caricato
- Dipartimento di Scienze dell'Emergenza, Anestesiologiche e della Rianimazione, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Anestesiologia e Rianimazione, Università Cattolica del sacro Cuore, Rome, Italy
| | - Domenico Luca Grieco
- Dipartimento di Scienze dell'Emergenza, Anestesiologiche e della Rianimazione, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Anestesiologia e Rianimazione, Università Cattolica del sacro Cuore, Rome, Italy
| | - Massimo Antonelli
- Dipartimento di Scienze dell'Emergenza, Anestesiologiche e della Rianimazione, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy; Istituto di Anestesiologia e Rianimazione, Università Cattolica del sacro Cuore, Rome, Italy
| | - Emiliano Cingolani
- UOSD Shock e Trauma, Azienda Ospedaliera San Camillo Forlanini, Rome, Italy
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Rahman SM, Hlady V. Downstream platelet adhesion and activation under highly elevated upstream shear forces. Acta Biomater 2019; 91:135-143. [PMID: 31004847 DOI: 10.1016/j.actbio.2019.04.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 04/04/2019] [Accepted: 04/11/2019] [Indexed: 12/17/2022]
Abstract
Elevated shear force caused by an anastomotic stenosis is a common complication at the blood vessel-vascular implant interface. Although elevated shear forces were found to cause platelet aggregation around a stenotic region, transient platelet exposure to elevated shear forces and subsequent downstream events occurring under lower shear force were not extensively studied. We hypothesize that effects of elevated shear forces on pre-activation of platelets for downstream adhesion and activation are relevant in understanding the increased thrombotic risk associated with blood-contacting devices. We designed a microfluidic flow system to mimic the hemodynamic environment of vasculature with an upstream anastomotic stenosis with five wall shear strain rates ranging from 1620 s-1 to 11560 s-1. Under shear flow conditions, transient exposure of whole blood to elevated shear forces resulted in higher downstream platelet adhesion onto three different immobilized platelet agonists: fibrinogen, collagen, or von Willebrand factor. Platelet expression of four activation markers (P-selectin, GPIIb/IIIa, lysosomal glycoprotein, and phosphatidylserine) significantly increased after transient exposure to higher upstream wall shear strain rates of 2975-11560 s-1. A significant lysis was observed when platelets were primed by upstream wall shear strain rate of 11560 s-1. These experimental results could be helpful to understand how altered hemodynamics around an anastomotic stenosis promotes thrombus formation downstream. STATEMENT OF SIGNIFICANCE: Studying the downstream response of platelets following transient exposure to an upstream agonist is important because of significant clinical implications to the implantation of vascular devices. Due to intimal fibrous hyperplasia, vascular biomaterials such as synthetic small-diameter vascular grafts sometimes become stenotic (narrow), leading to transient platelet exposure to elevated shear forces. In this study, a microfluidic flow system was developed to mimic a stenosed vascular graft and to investigate how highly elevated, transient upstream shear forces, typically found in severe stenosis, results in the pre-activation of platelets for downstream adhesion and activation. The findings of the present study have implications for optimizing the design of blood-contacting biomaterials in order to minimize thrombotic risk associated with transiently elevated shear forces. The findings also provide additional insights into the mechanisms of thrombus formation at the post-stenotic regions of vascular implants.
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Qiu J, Lingna W, Jinghong H, Yongqing Z. Oral administration of leeches (Shuizhi): A review of the mechanisms of action on antiplatelet aggregation. JOURNAL OF ETHNOPHARMACOLOGY 2019; 232:103-109. [PMID: 30543914 DOI: 10.1016/j.jep.2018.12.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 12/08/2018] [Accepted: 12/08/2018] [Indexed: 05/20/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The leeches (Shuizhi) comprise approximately 680 species distributed throughout the world. As recorded, they have been used as traditional Chinese medicines since the Eastern Han Dynasty, where they were claimed for promote blood circulation and eliminate blood stasis. And have been used to prevent CVDs by exerting multiple effects when orally administered, one of which is the significant inhibition of platelet aggregation. Its ability to exert this effect has been extensively investigated in vivo and in clinical practice. AIM OF STUDY The aim of this review is to summarize and analyse the antiplatelet aggregation mechanisms of leeches by oral administration, support their therapeutic potential and uncover opportunities for future research. MATERIALS AND METHODS Relevant studies from 1980 to 2018 on leeches and platelet aggregation were collected from ancient books, pharmacopoeia, reports and theses via library and internet databases (PubMed, CNKI, Google Scholar, Web of science, SciFinder, Springer and Elsevier). RESULTS Leeches is a unique animal medicine, they can prevent platelet aggregation by inhibiting ADP-induced platelet aggregation, increasing PGI2, decreasing TXA2 and Ca2+, and possibly recovering endothelial cell dysfunction. Leeches also exhibit a strong ability to activate eNOS, leading to an increase in platelet-derived NO. Additionally, the pteridine compounds obtained and identified from leeches have sulfur structure similar to those of other antiplatelet aggregation agents, such as ticlopidine, clopidogrel and ticagrelor. CONCLUSION The present review has focused on the related antiplatelet aggregation mechanisms, dipyridine compounds and toxicological information of leeches. According to the reported data, leeches have emerged as a good source of natural medicine for the treatment of antiplatelet aggregation agents and also make educated guesses for material basis of effects on antiplatelet aggregation. This review can help provide new insights for further studies in association with the development of effective antiplatelet aggregation drugs from natural medicines, especially leeches.
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Affiliation(s)
- Jiang Qiu
- School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China.
| | - Wang Lingna
- School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China.
| | - Hu Jinghong
- School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China.
| | - Zhang Yongqing
- School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China.
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Takahashi A, Takahashi S, Tsujino T, Isobe K, Watanabe T, Kitamura Y, Watanabe T, Nakata K, Kawase T. Platelet adhesion on commercially pure titanium plates in vitro I: effects of plasma components and involvement of the von Willebrand factor and fibronectin. Int J Implant Dent 2019; 5:5. [PMID: 30799507 PMCID: PMC6387980 DOI: 10.1186/s40729-019-0160-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 01/14/2019] [Indexed: 12/13/2022] Open
Abstract
Background Platelet-rich plasma (PRP) is widely used in regenerative dentistry. Furthermore, it is often applied in the pretreatment of titanium implants to improve their surface bioaffinity and initial stability. However, effects of PRP application on implant surface at cellular and molecular levels remain poorly understood. Therefore, we examined platelet adhesion on commercially pure titanium (cp-Ti) plates, with a particular focus on fibrinogen (FGN), von Willebrand factor (vWF), and fibronectin (FN), in the presence or absence of plasma components. Methods Citrated blood samples were obtained from six healthy male volunteers, and pure-PRP (P-PRP) and pure platelet suspensions in phosphate-buffered saline (PBS) were prepared. Platelet adhesion on cp-Ti plate surface was evaluated by phalloidin staining and tetrazolium dye assay. Distribution of FGN, vWF, FN, albumin, CD62P, and CD63 was examined by immunocytochemical analysis. Results Platelets in PBS suspensions rapidly and time-dependently adhered to cp-Ti plate surface, but this adhesion was substantially disturbed by the presence of plasma components. FGN was most preferably adsorbed regardless of the presence or absence of plasma components, while vWF and FN showed greater accumulation on platelet adhesion area. Conclusions Although FGN is rapidly and abundantly adsorbed on cp-Ti plate surface, vWF and FN function as major platelet adhesion molecules in citrated blood samples. After pretreatment with P-PRP, however, platelets adhered to cp-Ti much less efficiently. Therefore, P-PRP pretreatment might not directly contribute to surface functionalization, initial stabilization, and osseointegration of machined or similar types of implants. Electronic supplementary material The online version of this article (10.1186/s40729-019-0160-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | | | | | | | - Taisuke Watanabe
- Division of Anatomy and Cell Biology of the Hard Tissue, Institute of Medicine and Dentistry, Niigata University, Niigata, Japan
| | - Yutaka Kitamura
- Department of Oral and Maxillofacial Surgery, Matsumoto Dental University, Shiojiri, Japan
| | - Takao Watanabe
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan
| | - Koh Nakata
- Bioscience Medical Research Center, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Tomoyuki Kawase
- Division of Oral Bioengineering, Institute of Medicine and Dentistry, Niigata University, Niigata, Japan.
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Rahman SM, Eichinger CD, Hlady V. Effects of upstream shear forces on priming of platelets for downstream adhesion and activation. Acta Biomater 2018; 73:228-235. [PMID: 29654993 DOI: 10.1016/j.actbio.2018.04.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Revised: 03/29/2018] [Accepted: 04/02/2018] [Indexed: 01/27/2023]
Abstract
Platelets in flowing blood are sometimes exposed to elevated shear forces caused by anastomotic stenosis at the blood vessel-vascular implant interface. The objective of this study was to determine how effective upstream shear forces are in priming platelets for downstream adhesion and activation. Flow chambers with upstream stenotic regions (shear rates of 400-1000 s-1) were manufactured by relief molding of polydimethylsiloxane. Downstream from the stenotic regions, microcontact printing was used to covalently immobilize three different proteins (fibrinogen, collagen, or von Willebrand factor) to serve as platelet capture agents. Anticoagulated whole blood was perfused through the flow chambers and platelet adhesion to the downstream capture region was quantified. It was found that transient exposure of platelets to increased shear forces resulted in higher platelet adhesion on all three proteins. The duration of the platelet exposure to elevated shear forces was varied by changing the length of the stenotic regions. The results indicated that, in addition to the magnitude of shear forces, the duration of exposure to these forces was also an important factor in priming platelets. The effect of upstream shear forces on platelet activation was assessed by quantifying P-selectin, integrin αIIbβ3, lysosomal glycoprotein, and phosphatidylserine exposure using flow cytometry. The results suggested that increased shear forces were capable of increasing the priming of platelets for downstream activation. This study implicates the anastomotic region(s) of vascular implants as a locus of platelet pre-activation that may lead to thrombus formation downstream. STATEMENT OF SIGNIFICANCE A synthetic small-diameter vascular graft can often become stenotic due to intimal fibrous hyperplasia, either generally along the inside of the graft or at the anastomotic regions, leading to an increased shear force on flowing platelets. Our lab is studying how the upstream platelet preactivation (aka "priming") in flowing blood affects their downstream adhesion and activation. This manuscript describes a study in which priming of platelets is achieved by upstream stenotic narrowing in a microfluidic flow chamber. Such experimental design was intended to mimic a vascular implant with stenotic upstream anastomosis and downstream exposed platelet protein agonists. Understanding how the pre-activated platelets respond to imperfect vascular implant surfaces downstream is an important factor in designing better vascular implants.
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Affiliation(s)
- Shekh M Rahman
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, USA
| | - Colin D Eichinger
- Department of Bioengineering, University of Utah, Salt Lake City, UT, USA
| | - Vladimir Hlady
- Department of Bioengineering, University of Utah, Salt Lake City, UT, USA.
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Pujos JS, Reyssat M, Le Goff A. Experimental and numerical study of platelets rolling on a von Willebrand factor-coated surface. Med Eng Phys 2018; 55:25-33. [PMID: 29599066 DOI: 10.1016/j.medengphy.2018.03.005] [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: 09/28/2017] [Revised: 02/26/2018] [Accepted: 03/13/2018] [Indexed: 11/26/2022]
Abstract
Blood platelets circulate in the blood and adhere to wounded vessels to initiate coagulation and healing. The first step of this process is the capture of flowing platelets by adhesive molecules located at the wounded vessel wall. In this article, we study the transport of fixed blood platelets in a microfluidic channel coated with von Willebrand factor (vWF), a large multimeric protein expressed by endothelial cells in the vicinity of wounds. We measure the number of platelets adsorbed at the channel surface as a function of both time and space. Experimental results are compared with a new transport model. We show that transverse diffusion is an important feature of our model, while the rolling behaviour of the bounded platelets can be neglected.
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Affiliation(s)
- Justine S Pujos
- ESPCI Paris, PSL Research University, CNRS UMR 7083 Gulliver, 10 rue Vauquelin, 75231 Paris Cedex 05, France
| | - Mathilde Reyssat
- ESPCI Paris, PSL Research University, CNRS UMR 7083 Gulliver, 10 rue Vauquelin, 75231 Paris Cedex 05, France
| | - Anne Le Goff
- ESPCI Paris, PSL Research University, CNRS UMR 7083 Gulliver, 10 rue Vauquelin, 75231 Paris Cedex 05, France; Sorbonne Universités, Université de Technologie de Compiègne, CNRS UMR 7338 Biomécanique et Bioingénierie, Centre de recherche Royallieu, CS 60 319, Compiègne cedex 60 203, France.
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11
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Schlimp CJ, Schöchl H. The role of fibrinogen in trauma-induced coagulopathy. Hamostaseologie 2017; 34:29-39. [DOI: 10.5482/hamo-13-07-0038] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 10/18/2013] [Indexed: 12/18/2022] Open
Abstract
SummaryFibrinogen plays an essential role in clot formation and stability. Importantly it seems to be the most vulnerable coagulation factor, reaching critical levels earlier than the others during the course of severe injury. A variety of causes of fibrinogen depletion in major trauma have been identified, such as blood loss, dilution, consumption, hyperfibrinolysis, hypothermia and acidosis. Low concentrations of fibrinogen are associated with an increased risk of diffuse microvascular bleeding. Therefore, repeated measurements of plasma fibrinogen concentration are strongly recommended in trauma patients with major bleeding. Recent guidelines recommend maintaining plasma fibrinogen concentration at 1.5–2 g/l in coagulopathic patients. It has been shown that early fibrinogen substitution is associated with improved outcome.
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12
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Binary agonist surface patterns prime platelets for downstream adhesion in flowing whole blood. Biointerphases 2017; 12:02C406. [PMID: 28454486 PMCID: PMC5409849 DOI: 10.1116/1.4982596] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
As platelets encounter damaged vessels or biomaterials, they interact with a complex milieu of surface-bound agonists, from exposed subendothelium to adsorbed plasma proteins. It has been shown that an upstream, surface-immobilized agonist is capable of priming platelets for enhanced adhesion downstream. In this study, binary agonists were integrated into the upstream position of flow cells and the platelet priming response was measured by downstream adhesion in flowing whole blood. A nonadditive response was observed in which platelets transiently exposed to two agonists exhibited greater activation and downstream adhesion than that from the sum of either agonist alone. Antibody blocking of one of the two upstream agonists eliminated nonadditive activation and downstream adhesion. Crosstalk between platelet activation pathways likely led to a synergistic effect which created an enhanced activation response in the platelet population. The existence of synergy between platelet priming pathways is a concept that has broad implications for the field of biomaterials hemocompatibility and platelet activity testing.
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Zeller Meidell K, Robinson R, Vieira-de-Abreu A, Gormley AJ, Ghandehari H, W Grainger D, A Campbell R. RGDfK-functionalized gold nanorods bind only to activated platelets. J Biomed Mater Res A 2016; 105:209-217. [PMID: 27648522 DOI: 10.1002/jbm.a.35902] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Revised: 08/15/2016] [Accepted: 09/14/2016] [Indexed: 12/12/2022]
Abstract
Integrin-targeting peptide RGDfK-labeled gold nanorods (GNR) seek to improve hyperthermia targeted to solid tumors by exploiting the known up-regulation of integrin αvβ3 cell membrane proteins on solid tumor vasculature surfaces. Tumor binding specificity might be expected since surrounding tissues and endothelial cells have limited numbers of these receptors. However, RGD peptide binding to many proteins is promiscuous, with known affinity to several families of cell integrin receptors, and also possible binding to platelets after intravenous infusion via a different integrin receptor, αIIbβ3, on platelets. Binding of RGDfK-targeted GNR could considerably impact platelet function, ultimately leading to increased risk of bleeding or thrombosis depending on the degree of interaction. We sought to determine if RGDfK-labeled GNR could interact with platelets and alter platelet function. Targeted and untargeted nanorods exhibited little interaction with resting platelets in platelet rich plasma (PRP) preparations. However, upon platelet activation, peptide-targeted nanorods bound actively to platelets. Addition of RGDfK-GNR to unactivated platelets had little effect on markers of platelet activation, indicating that RGDfK-nanorods were incapable of inducing platelet activation. We next tested whether activated platelet function was altered in the presence of peptide-targeted nanorods. Platelet aggregation in whole blood and PRP in the presence of targeted nanorods had no significant effect on platelet aggregation. These data suggest that RGDfK-GNR alone have little impact on platelet function in plasma. However, nonspecific nanorod binding may occur in vascular beds where activated platelets are normally cleared, such as the spleen and liver, producing a possible toxicity risk for these nanomaterials. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 209-217, 2017.
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Affiliation(s)
- Krystin Zeller Meidell
- Department of Pharmaceutics and Pharmaceutical Chemistry, Health Sciences, University of Utah, Salt Lake City, Utah, 84112
| | - Ryan Robinson
- Department of Bioengineering, University of Utah, Salt Lake City, Utah, 84112.,Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, Utah, 84112
| | - Adriana Vieira-de-Abreu
- Program in Molecular Medicine, School of Medicine, University of Utah, Salt Lake City, Utah, 84112
| | - Adam J Gormley
- Department of Bioengineering, University of Utah, Salt Lake City, Utah, 84112.,Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, Utah, 84112
| | - Hamidreza Ghandehari
- Department of Pharmaceutics and Pharmaceutical Chemistry, Health Sciences, University of Utah, Salt Lake City, Utah, 84112.,Department of Bioengineering, University of Utah, Salt Lake City, Utah, 84112.,Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, Utah, 84112
| | - David W Grainger
- Department of Pharmaceutics and Pharmaceutical Chemistry, Health Sciences, University of Utah, Salt Lake City, Utah, 84112.,Department of Bioengineering, University of Utah, Salt Lake City, Utah, 84112.,Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, Utah, 84112
| | - Robert A Campbell
- Program in Molecular Medicine, School of Medicine, University of Utah, Salt Lake City, Utah, 84112
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14
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Hadjesfandiari N, Schubert P, Fallah Toosi S, Chen Z, Culibrk B, Ramirez-Arcos S, Devine DV, Brooks DE. Effect of texture of platelet bags on bacterial and platelet adhesion. Transfusion 2016; 56:2808-2818. [DOI: 10.1111/trf.13756] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Revised: 06/29/2016] [Accepted: 07/03/2016] [Indexed: 11/30/2022]
Affiliation(s)
- Narges Hadjesfandiari
- Department of Chemistry; Canadian Blood Services; Vancouver British Columbia
- Centre for Blood Research, University of British Columbia, Canadian Blood Services; Vancouver British Columbia
| | - Peter Schubert
- Centre for Blood Research, University of British Columbia, Canadian Blood Services; Vancouver British Columbia
- Centre for Innovation, Canadian Blood Services; Vancouver British Columbia
- Department of Pathology and Laboratory Medicine; University of British Columbia; Vancouver British Columbia
| | - Salma Fallah Toosi
- Department of Chemical and Biological Engineering; University of British Columbia; Vancouver Canada
| | - Zhongming Chen
- Centre for Blood Research, University of British Columbia, Canadian Blood Services; Vancouver British Columbia
- Centre for Innovation, Canadian Blood Services; Vancouver British Columbia
| | - Brankica Culibrk
- Centre for Blood Research, University of British Columbia, Canadian Blood Services; Vancouver British Columbia
- Centre for Innovation, Canadian Blood Services; Vancouver British Columbia
| | | | - Dana V. Devine
- Centre for Blood Research, University of British Columbia, Canadian Blood Services; Vancouver British Columbia
- Centre for Innovation, Canadian Blood Services; Vancouver British Columbia
- Department of Pathology and Laboratory Medicine; University of British Columbia; Vancouver British Columbia
| | - Donald E. Brooks
- Department of Chemistry; Canadian Blood Services; Vancouver British Columbia
- Centre for Blood Research, University of British Columbia, Canadian Blood Services; Vancouver British Columbia
- Department of Pathology and Laboratory Medicine; University of British Columbia; Vancouver British Columbia
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15
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Eichinger CD, Fogelson AL, Hlady V. Functional assay of antiplatelet drugs based on margination of platelets in flowing blood. Biointerphases 2016; 11:029805. [PMID: 27030476 PMCID: PMC4818277 DOI: 10.1116/1.4945305] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 03/18/2016] [Accepted: 03/22/2016] [Indexed: 02/02/2023] Open
Abstract
A novel functional assay of antiplatelet drug efficacy was designed by utilizing the phenomena of platelet margination in flowing blood and transient platelet contacts with surface-immobilized platelet agonists. Flow margination enhances transient contacts of platelets with the walls of flow chambers covered with surface-immobilized proteins. Depending on the type and the surface density of the immobilized agonists, such transient interactions could "prime" the marginated platelet subpopulation for enhanced activation and adhesion downstream. By creating an upstream surface patch with an immobilized platelet agonist, platelet flow margination was used to test how effective antiplatelet drugs are in suppressing downstream platelet activation and adhesion. The platelet adhesion downstream was measured by a so-called "capture" patch region close to the distal end of the flow chamber. Platelet adhesion downstream was found to be dose-dependent on the upstream surface coverage of the "priming" patch, with immobilized fibrinogen acting as a platelet agonist. Several antiplatelet agents (acetylsalicylic acid, eptifibatide, and tirofiban) were evaluated for their efficacy in attenuating downstream adhesion after upstream platelet priming. The activation of the platelet population was found to be dependent on both the extent of the upstream agonist stimulus and the antiplatelet drug concentration. Such a relationship provides an opportunity to measure the efficacy of specific antiplatelet agents against the type and concentration of upstream platelet agonists.
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Affiliation(s)
- Colin D Eichinger
- Department of Bioengineering, University of Utah, Salt Lake City, Utah 84112
| | - Aaron L Fogelson
- Department of Mathematics, University of Utah, Salt Lake City, Utah 84112
| | - Vladimir Hlady
- Department of Bioengineering, University of Utah, Salt Lake City, Utah 84112
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16
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Kaleekkal NJ, Rana D, Mohan D. Functionalized MWCNTs in improving the performance and biocompatibility of potential hemodialysis membranes. RSC Adv 2016. [DOI: 10.1039/c6ra09354j] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Functionalized multi-walled carbon nanotube incorporated polyetherimide mixed matrix membranes for blood purification application.
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Affiliation(s)
- Noel Jacob Kaleekkal
- Membrane Laboratory
- Department of Chemical Engineering
- Anna University
- Chennai-600025
- India
| | - Dipak Rana
- Department of Chemical and Biological Engineering
- University of Ottawa
- Ottawa
- Canada
| | - D. Mohan
- Membrane Laboratory
- Department of Chemical Engineering
- Anna University
- Chennai-600025
- India
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17
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Kaleekkal NJ, Thanigaivelan A, Durga M, Girish R, Rana D, Soundararajan P, Mohan D. Graphene Oxide Nanocomposite Incorporated Poly(ether imide) Mixed Matrix Membranes for in Vitro Evaluation of Its Efficacy in Blood Purification Applications. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b01655] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Noel Jacob Kaleekkal
- Membrane
Laboratory, Department of Chemical Engineering, Alagappa College of
Technology, Anna University, Chennai 600025, India
| | - A. Thanigaivelan
- Membrane
Laboratory, Department of Chemical Engineering, Alagappa College of
Technology, Anna University, Chennai 600025, India
| | - M. Durga
- Membrane
Laboratory, Department of Chemical Engineering, Alagappa College of
Technology, Anna University, Chennai 600025, India
| | - R. Girish
- Department
of Nephrology, Sri Ramachandra University, Porur, Chennai 600116, India
| | - Dipak Rana
- Department
of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur Private, Ottawa, Ontario K1N 6N5, Canada
| | - P. Soundararajan
- Department
of Nephrology, Sri Ramachandra University, Porur, Chennai 600116, India
| | - D. Mohan
- Membrane
Laboratory, Department of Chemical Engineering, Alagappa College of
Technology, Anna University, Chennai 600025, India
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18
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Chen J, Yang P, Liao Y, Wang J, Chen H, Sun H, Huang N. Effect of the duration of UV irradiation on the anticoagulant properties of titanium dioxide films. ACS APPLIED MATERIALS & INTERFACES 2015; 7:4423-4432. [PMID: 25679095 DOI: 10.1021/am509006y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Recently, UV irradiation has been reported as a new approach to significantly improve the anticoagulant properties of titanium dioxide (TiO2) films by suppressing fibrinogen adsorption and platelet adhesion. This study focuses on how fibrinogen adsorption of and platelet adhesion to TiO2 films is affected by the duration of UV irradiation. Furthermore, this study intends to describe the link between the suppression effect and the changes in the TiO2 films nature caused by photogenerated reactive oxygen species (ROS). First, we performed UV irradiation in different atmospheres as model 1 to determine the effect of oxygen gas on the anticoagulant properties of TiO2 films. The results showed that the suppression of platelet adhesion induced by UV irradiation depended on the presence of oxygen gas, indicating that ROS were photogenerated, and the ROS-induced surface change was related to the improvement in the anticoagulant ability. Then, we fabricated three other types of TiO2 samples in air by varying the UV irradiation time: (1) model 2, comprising fully UV-irradiated TiO2 films, (2) model 3, comprising partially UV-irradiated TiO2 films, and (3) model 4, comprising fully UV-irradiated TiO2-Si micropatterns. The results indicated that UV irradiation affected the anticoagulant properties of TiO2 films in a time-dependent manner. UV irradiation on TiO2 films for short duration (e.g., 1 min) evidenced a suppression effect on fibrinogen adsorption and platelet adhesion, an effect that could not be the result of photoinduced superhydrophilicity, increased hydroxyl groups (-OH) number, or decomposition of the adsorbed hydrocarbon. When the UV irradiation time was longer, this suppression effect extended from the surface of the UV-irradiated TiO2 films to the surface of the adjacent masked TiO2 films and the nearby Si surface. This result supported that the suppression effect could be related to the changes in the nature of the TiO2 films that were caused by the photogenerated and diffused ROS. Further, this extension of the suppression effect to the Si surface indicated that the photogenerated ROS could be used to improve the anticoagulant properties of other materials. A prolonged UV irradiation time (e.g., 240 min) may enhance the fibrinogen adsorption of and platelet adhesion to TiO2 films, which could be related to the decomposition of the adsorbed hydrocarbon and the increase in the positive charge. However, when comparing the enhancement effect and the suppression effect, the results showed that the latter was the main one to influence fibrinogen adsorption of and platelet adhesion to TiO2 films. This study provides an important basis for understanding the behavior of UV-irradiated TiO2 films as anticoagulant materials.
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Affiliation(s)
- Jiang Chen
- Institute of Biomaterials and Surface Engineering, Key Laboratory for Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University , Chengdu 610031, People's Republic of China
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19
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Toward highly blood compatible hemodialysis membranes via blending with heparin-mimicking polyurethane: Study in vitro and in vivo. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2014.07.030] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Schlimp CJ, Voelckel W, Inaba K, Maegele M, Ponschab M, Schöchl H. Estimation of plasma fibrinogen levels based on hemoglobin, base excess and Injury Severity Score upon emergency room admission. Crit Care 2013; 17:R137. [PMID: 23849249 PMCID: PMC4056007 DOI: 10.1186/cc12816] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 05/24/2013] [Accepted: 07/12/2013] [Indexed: 01/13/2023] Open
Abstract
INTRODUCTION Fibrinogen plays a key role in hemostasis and is the first coagulation factor to reach critical levels in massively bleeding trauma patients. Consequently, rapid estimation of plasma fibrinogen (FIB) is essential upon emergency room (ER) admission, but is not part of routine coagulation monitoring in many centers. We investigated the predictive ability of the laboratory parameters hemoglobin (Hb) and base excess (BE) upon admission, as well as the Injury Severity Score (ISS), to estimate FIB in major trauma patients. METHODS In this retrospective study, major trauma patients (ISS ≥16) with documented FIB analysis upon ER admission were eligible for inclusion. FIB was correlated with Hb, BE and ISS, alone and in combination, using regression analysis. RESULTS A total of 675 patients were enrolled (median ISS 27). FIB upon admission correlated strongly with Hb, BE and ISS. Multiple regression analysis showed that Hb and BE together predicted FIB (adjusted R2 = 0.46; loge(FIB) = 3.567 + 0.223.Hb - 0.007.Hb2 + 0.044.BE), and predictive strength increased when ISS was included (adjusted R2 = 0.51; loge(FIB) = 4.188 + 0.243.Hb - 0.008.Hb2 + 0.036.BE - 0.031.ISS + 0.0003.ISS2). Of all major trauma patients admitted with Hb <12 g/dL, 74% had low (<200 mg/dL) FIB and 54% had critical (<150 mg/dL) FIB. Of patients admitted with Hb <10 g/dL, 89% had low FIB and 73% had critical FIB. These values increased to 93% and 89%, respectively, among patients with an admission Hb <8 g/dL. Sixty-six percent of patients with only a weakly negative BE (<-2 mmol/L) showed low FIB. Of patients with BE <-6 mmol/L upon admission, 81% had low FIB and 63% had critical FIB. The corresponding values for BE <-10 mmol/L were 89% and 78%, respectively. CONCLUSIONS Upon ER admission, FIB of major trauma patients shows strong correlation with rapidly obtainable, routine laboratory parameters such as Hb and BE. These two parameters might provide an insightful and rapid tool to identify major trauma patients at risk of acquired hypofibrinogenemia. Early calculation of ISS could further increase the ability to predict FIB in these patients. We propose that FIB can be estimated during the initial phase of trauma care based on bedside tests.
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Affiliation(s)
- Christoph J Schlimp
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, AUVA Research Centre, Donaueschingenstrasse 13, 1200 Vienna, Austria
| | - Wolfgang Voelckel
- Department of Anaesthesiology and Intensive Care Medicine, AUVA Trauma Centre, Dr. Franz Rehrl Platz 5, 5020 Salzburg, Austria
| | - Kenji Inaba
- Department of Surgery, Los Angeles County and University of Southern California Medical Center, 2051 Marengo Street, Los Angeles, CA 90033, USA
| | - Marc Maegele
- Department of Trauma and Orthopedic Surgery, Institute for Research in Operative Medicine (IFOM), University of Witten/Herdecke, Cologne-Merheim Medical Center (CMMC), Ostmerheimerstrasse 200, 51109 Cologne, Germany
| | - Martin Ponschab
- Department of Anaesthesiology and Intensive Care Medicine, AUVA Trauma Centre, Garnisonstrasse 7, 4017 Linz, Austria
| | - Herbert Schöchl
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, AUVA Research Centre, Donaueschingenstrasse 13, 1200 Vienna, Austria
- Department of Anaesthesiology and Intensive Care Medicine, AUVA Trauma Centre, Dr. Franz Rehrl Platz 5, 5020 Salzburg, Austria
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Englade-Franklin LE, Saner CK, Garno JC. Spatially selective surface platforms for binding fibrinogen prepared by particle lithography with organosilanes. Interface Focus 2013; 3:20120102. [PMID: 24427541 PMCID: PMC3638418 DOI: 10.1098/rsfs.2012.0102] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
We introduce an approach based on particle lithography to prepare spatially selective surface platforms of organosilanes that are suitable for nanoscale studies of protein binding. Particle lithography was applied for patterning fibrinogen, a plasma protein that has a major role in the clotting cascade for blood coagulation and wound healing. Surface nanopatterns of mercaptosilanes were designed as sites for the attachment of fibrinogen within a protein-resistant matrix of 2-[methoxy(polyethyleneoxy)propyl] trichlorosilane (PEG-silane). Preparing site-selective surfaces was problematic in our studies, because of the self-reactive properties of PEG-organosilanes. Certain organosilanes presenting hydroxyl head groups will cross react to form mixed surface multi-layers. We developed a clever strategy with particle lithography using masks of silica mesospheres to protect small, discrete regions of the surface from cross reactions. Images acquired with atomic force microscopy (AFM) disclose that fibrinogen attached primarily to the surface areas presenting thiol head groups, which were surrounded by PEG-silane. The activity for binding anti-fibrinogen was further evaluated using ex situ AFM studies, confirming that after immobilization the fibrinogen nanopatterns retained capacity for binding immunoglobulin G. Studies with AFM provide advantages of achieving nanoscale resolution for detecting surface changes during steps of biochemical surface reactions, without requiring chemical modification of proteins or fluorescent labels.
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Affiliation(s)
| | | | - Jayne C. Garno
- Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA
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