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Zhang J, Han D, Chen Z, Wang S, Sun W, Griffith BP, Wu ZJ. Linking Computational Fluid Dynamics Modeling to Device-Induced Platelet Defects in Mechanically Assisted Circulation. ASAIO J 2024:00002480-990000000-00490. [PMID: 38768482 DOI: 10.1097/mat.0000000000002242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2024] Open
Abstract
Thrombotic and bleeding events are the most common hematologic complications in patients with mechanically assisted circulation and are closely related to device-induced platelet dysfunction. In this study, we sought to link computational fluid dynamics (CFD) modeling of blood pumps with device-induced platelet defects. Fresh human blood was circulated in circulatory loops with four pumps (CentriMag, HVAD, HeartMate II, and CH-VAD) operated under a total of six clinically representative conditions. Blood samples were collected and analyzed for glycoprotein (GP) IIb/IIIa activation and receptor shedding of GPIbα and GPVI. In parallel, CFD modeling was performed to characterize the blood flow in these pumps. Numerical indices of platelet defects were derived from CFD modeling incorporating previously derived power-law models under constant shear conditions. Numerical results were correlated with experimental results by regression analysis. The results suggested that a scalar shear stress of less than 75 Pa may have limited contribution to platelet damage. The platelet defect indices predicted by the CFD power-law models after excluding shear stress <75 Pa correlated excellently with experimentally measured indices. Although numerical prediction based on the power-law model cannot directly reproduce the experimental data. The power-law model has proven its effectiveness, especially for quantitative comparisons.
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Affiliation(s)
- Jiafeng Zhang
- From the Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Dong Han
- From the Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Zengsheng Chen
- From the Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Shigang Wang
- From the Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Wenji Sun
- From the Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Bartley P Griffith
- From the Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Zhongjun J Wu
- From the Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
- Fischell Department of Bioengineering, A. James Clark School of Engineering, University of Maryland, College Park, Maryland
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Trivigno SMG, Guidetti GF, Barbieri SS, Zarà M. Blood Platelets in Infection: The Multiple Roles of the Platelet Signalling Machinery. Int J Mol Sci 2023; 24:ijms24087462. [PMID: 37108623 PMCID: PMC10138547 DOI: 10.3390/ijms24087462] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/12/2023] [Accepted: 04/14/2023] [Indexed: 04/29/2023] Open
Abstract
Platelets are classically recognized for their important role in hemostasis and thrombosis but they are also involved in many other physiological and pathophysiological processes, including infection. Platelets are among the first cells recruited to sites of inflammation and infection and they exert their antimicrobial response actively cooperating with the immune system. This review aims to summarize the current knowledge on platelet receptor interaction with different types of pathogens and the consequent modulations of innate and adaptive immune responses.
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Affiliation(s)
- Silvia M G Trivigno
- Department of Biology and Biotechnology, University of Pavia, 27100 Pavia, Italy
- University School for Advanced Studies, IUSS, 27100 Pavia, Italy
| | | | - Silvia Stella Barbieri
- Unit of Heart-Brain Axis: Cellular and Molecular Mechanisms, Centro Cardiologico Monzino IRCCS, 20138 Milano, Italy
| | - Marta Zarà
- Unit of Heart-Brain Axis: Cellular and Molecular Mechanisms, Centro Cardiologico Monzino IRCCS, 20138 Milano, Italy
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3
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Zhang T, Liu L, Huang X, Gao X, Chen D, Huan X, He C, Li Y. Effect of pathological high shear exposure time on platelet activation and aggregation. Clin Hemorheol Microcirc 2023:CH221567. [PMID: 37066902 DOI: 10.3233/ch-221567] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
Abstract
Circulating platelets are sometimes exposed to high shear rate environments due to vascular stenosis, and the effect of transiently elevated pathological high shear rates on platelet activation and aggregation function has not been clarified. The aim of this study was to investigate the effect of pathological high shear rate (8302s - 1) exposure time (3.16-25.3 ms) on platelet activation and aggregation function. In addition, by adding active ingredients of antiplatelet drugs such as ASA (an active ingredient of aspirin), Ticagrelor, Tirofiban and GP1BA (platelet membrane protein GPIb inhibitor) in vitro, we studied TXA2, P2Y12-ADP, GPIIb/IIIa-fibrinogen and GPIb /IX/V-vWF receptor pathways to determine platelet activation function mediated by pathological high shear rate. In this study, we designed a set of microfluidic chips with stenosis lengths of 0.5 mm, 1 mm, 2 mm, 3 mm, and 4 mm, all with 80% stenosis, to generate pathological high shear forces that can act at different times. The whole blood flowing through the microchannels was collected by perfusion of sodium citrate anticoagulated whole blood at a physiological arterial shear rate (1500 s - 1), and the expression levels of platelet surface activation markers (P-selectin and GP IIb/IIIa) and the degree of platelet aggregation were analyzed by flow cytometry; platelet aggregation patterns were observed by microscopic examination of blood smears. The results showed that shearing significantly increased platelet activation and aggregation levels compared to un-sheared whole blood, and the activation and aggregation levels increased with increasing duration of pathological high shear rate. In vitro inhibition studies showed that ASA barely inhibited the expression of P-selectin and PAC-1 on the platelet surface; Ticagrelor effectively inhibited the expression of both P-selectin and PAC-1; Tirofiban significantly inhibited the expression of PAC-1 on the platelet surface and slightly inhibited the expression of P-selectin; GP1BA significantly inhibited the expression of both.ur results suggest that transient pathological high shear rate (8302s - 1) exposure can induce platelet activation in a time-dependent manner; however, the mechanism is more complex and may be due to the following reasons: transient elevated pathological high shear rate activates platelets through the GPIb/IX/V-vWF receptor pathway, and after platelet activation, its surface membrane protein GPIIb/IIIa receptors activate platelets through fibrinogen to form platelet-platelet aggregates, and further activation of active substances such as ADP and TXA2 released by platelet alpha particles, which contribute to the formation of irreversible platelet aggregation.
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Affiliation(s)
- Tiancong Zhang
- Central Laboratory of Yong-chuan Hospital, Chongqing Medical University, Chongqing, China
| | - Ling Liu
- Central Laboratory of Yong-chuan Hospital, Chongqing Medical University, Chongqing, China
| | - Xiaojing Huang
- Central Laboratory of Yong-chuan Hospital, Chongqing Medical University, Chongqing, China
| | - Xuemei Gao
- Central Laboratory of Yong-chuan Hospital, Chongqing Medical University, Chongqing, China
| | - Dan Chen
- Central Laboratory of Yong-chuan Hospital, Chongqing Medical University, Chongqing, China
| | - Xuanrong Huan
- Central Laboratory of Yong-chuan Hospital, Chongqing Medical University, Chongqing, China
| | - Cui He
- Department of Blood Transfusion of Yong-chuan Hospital, Chongqing Medical University, Chongqing, China
| | - Yuan Li
- Central Laboratory of Yong-chuan Hospital, Chongqing Medical University, Chongqing, China
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4
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Li Y, Wang H, Xi Y, Sun A, Wang L, Deng X, Chen Z, Fan Y. A mathematical model for assessing shear induced bleeding risk. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2023; 231:107390. [PMID: 36745955 DOI: 10.1016/j.cmpb.2023.107390] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 01/16/2023] [Accepted: 01/30/2023] [Indexed: 06/18/2023]
Abstract
PURPOSE The objective of this study is to develop a bleeding risk model for assessing device-induced bleeding risk in patients supported with blood contact medical devices (BCMDs). METHODS The mathematical model for evaluating bleeding risk considers the effects of shear stress on von Willebrand factor (vWF) unfolding, high molecular weight multimers-vWF (HMWM-vWF) degradation, platelet activation and receptor shedding and platelet-vWF binding ability. Functions of the effect of shear stress on the above factors are fitted/employed and solved by the Eulerian transport equation. An axial flow-through Couette device and two clinical VADs which are HeartWare Ventricular Assist Device (HVAD) and HeartMate II (HM II) blood pump were employed to perform the simulation to evaluate platelet receptor shedding (GPIbα and GPIIb/IIIa), loss of HWMW-vWF, platelet-vWF binding ability and bleeding risk for validating the accuracy of our model. RESULTS The platelet-vWF binding ability after being subjected to high shear region in the axial flow-through Couette device predicted by our bleeding model was highly consistent with reported experimental data. As indicated by our CFD simulation results in the axial flow-through Couette device, it can find that an increase in shear stress led to a decrease in the adhesion ability of platelets on vWF, while the binding ability of vWF with platelets first increase and then decrease as shear stress elevates gradually beyond a threshold. The factor of exposure time can enhance the effect of shear stress. Additionally, the shear-induced bleeding risk predicted by our model increases with increasing shear stress and exposure time in an axial flow-through Couette device. As indicated by our numerical model, the bleeding risk in HVAD was higher than HMII, which is highly consistent with the meta-analysis based on clinical statistics. Our simulation investigations in these two clinical VADs also found that HVAD caused a higher rate of platelet receptor shedding and lower damage to HWMW-vWF than HeartMate II. The high shear stress generated in the narrow and turbulent regions of both VADs was the underlying cause of device-induced bleeding. CONCLUSION In this study, the shear-induced bleeding risk predicted by our bleeding model in axial flow-through Couette device and two clinical VADs is consistent or highly correlated with experimental and clinical findings, which proves the accuracy of our bleeding model. Our bleeding model can be used to aid the development of new BCMDs with improved functional characteristics and biocompatibility, and help to reduce risk of device-induced adverse events in patients.
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Affiliation(s)
- Yuan Li
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Hongyu Wang
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Yifeng Xi
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Anqiang Sun
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Lizhen Wang
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Xiaoyan Deng
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Zengsheng Chen
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.
| | - Yubo Fan
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.
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The Glycoprotein (GP)Ib-IX-V Complex on Platelets: GPIbα Protein Expression Is Reduced in HeartMate 3 Patients with Bleeding Complications within the First 3 Months. Int J Mol Sci 2023; 24:ijms24065639. [PMID: 36982712 PMCID: PMC10056759 DOI: 10.3390/ijms24065639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 03/13/2023] [Accepted: 03/14/2023] [Indexed: 03/18/2023] Open
Abstract
Non-surgical bleeding (NSB) remains the most critical complication in patients under left ventricular assist device (LVAD) support. It is well known that blood exposed to high shear stress results in platelet dysfunction. Compared to patients without NSB, decreased surface expression of platelet receptor GPIbα was observed in LVAD patients with NSB. In this study, we aimed to compare the expression level of glycoprotein (GP)Ib-IX-V platelet receptor complex in HeartMate 3 (HM 3) patients with and without bleeding complications to investigate the alterations of the platelet transcriptomic profile on platelet damage and increased bleeding risk. Blood samples were obtained from HM 3 patients with NSB (bleeder group, n = 27) and without NSB (non-bleeder group, n = 55). The bleeder group was further divided into patients with early NSB (bleeder ≤ 3 mo, n = 19) and patients with late NSB (bleeder > 3 mo, n = 8). The mRNA and protein expression of GPIbα, GPIX and GPV were quantified for each patient. Non-bleeder, bleeder ≤ 3 mo and bleeder > 3 mo were comparable regarding the mRNA expression of GPIbα, GPIX and GPV (p > 0.05). The protein analysis revealed a significantly reduced expression level of the main receptor subunit GPIbα in bleeders ≤ 3 mo (p = 0.04). We suggest that the observed reduction of platelet receptor GPIbα protein expression in patients who experienced their first bleeding event within 3 months after LVAD implantation may influence platelet physiology. The alterations of functional GPIbα potentially reduce the platelet adhesion capacities, which may lead to an impaired hemostatic process and the elevated propensity of bleeding in HM 3 patients.
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6
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Velasquez-Mao AJ, Velasquez M, Vandsburger MH. Cyclical depressurization degranulates platelets in an agonist-free mechanism of platelet activation. PLoS One 2022; 17:e0274178. [PMID: 36107866 PMCID: PMC9477271 DOI: 10.1371/journal.pone.0274178] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 08/24/2022] [Indexed: 11/18/2022] Open
Abstract
Activation of circulating platelets by receptor binding and subsequent coagulation events are defined by a well characterized physiological response. However, the growing prevalence of chronic kidney disease (CKD) and implication of platelet-released factors in worsening cardiovascular outcomes with hemodialysis warrant further investigation into the mechanobiology of platelet degranulation. The significant drops in pressure caused by high friction across the hemodialysis flow circuit present an overlooked platelet stimulant not involving immobilization as a driver for cytoskeletal rearrangement. In this study, platelets from healthy and dialysis (pre- and post-treatment) donors were cyclically depressurized in static suspension to measure changes in physiology by integrin αIIbβ3 activation and surface P-selectin expression. The progressive increase in CD62P with no changes in PAC1 over pressure-cycling duration regardless of uremia signifies that hydrostatic depressurization involves a novel agonist-free mechanism leading to platelet degranulation as a unique case in which CD62P and PAC1 do not interchangeably indicate platelet activation. Subsequent stimulation using ADP further suggests that sustained depressurization regimens desensitize integrin αIIbβ3 activation. Variability in platelet response caused by uremia and CKD are observed by elevated baseline PAC1 in pre-dialysis samples, PAC1 retention after ADP exposure, and maximum CD62P with ADP independent of pressure. Theory for hydrostatic pressure-induced degranulation circumventing integrin-initiated signal transduction is here presented based on the Starling Equation.
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Affiliation(s)
- Aaron J. Velasquez-Mao
- UC Berkeley–UCSF Graduate Program in Bioengineering, Berkeley, CA, United States of America
| | - Mark Velasquez
- Department of Bioengineering, UC Berkeley, Berkeley, CA, United States of America
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7
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Al-Tamimi M, Qiao J, Gardiner EE. The utility of platelet activation biomarkers in thrombotic microangiopathies. Platelets 2022; 33:503-511. [PMID: 35287530 DOI: 10.1080/09537104.2022.2026912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Primary thrombotic microangiopathies (TMAs) are observed in thrombotic thrombocytopenic purpura (TTP) and hemolytic uremic syndrome (HUS), while secondary TMAs have a wide range of etiologies. Early diagnosis and treatment of TMA are critical for patient well-being; however, distinguishing TTP from HUS on presentation is particularly challenging. Thrombocytopenia and platelet activation are central to different types of TMAs, thus limiting the utility of standard diagnostic approaches to evaluate the platelet function and hemostatic capacity. Alternative means of quantifying and monitoring changes to platelet activation and function are urgently needed. Activated platelets have been shown to interact with proteins of the complement and coagulation cascades and form part of inflammation processes engaged in TMA. Increased levels of platelet surface receptors as well as increased plasma levels of platelet-derived soluble proteins have been reported in TMAs. Elevated levels of platelet-leukocyte aggregates and platelet microparticles are also reported in different types of TMAs. Larger prospective evaluations of platelet activation markers in TMA using standardized assays, with comparison to cohorts of patients with thrombosis, coagulopathy, and thrombocytopenia, to evaluate the clinical usefulness of platelet markers in TMA are now needed. This review will summarize the current knowledge around platelet activation markers and critically evaluate their utility in diagnosis and prognosis of TMA patients.
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Affiliation(s)
- Mohammad Al-Tamimi
- Department of Basic Medical Sciences, Faculty of Medicine, The Hashemite University, Zarqa, Jordan
| | - Jianlin Qiao
- Blood Diseases Institute, Xuzhou Medical University, Xuzhou, China
| | - Elizabeth E Gardiner
- ACRF Department of Cancer Biology and Therapeutics, John Curtin School of Medical Research, Australian National University, Canberra, Australia
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8
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Wang S, Griffith BP, Wu ZJ. Device-Induced Hemostatic Disorders in Mechanically Assisted Circulation. Clin Appl Thromb Hemost 2021; 27:1076029620982374. [PMID: 33571008 PMCID: PMC7883139 DOI: 10.1177/1076029620982374] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Mechanically assisted circulation (MAC) sustains the blood circulation in the body of a patients undergoing cardiac surgery with cardiopulmonary bypass (CPB) or on ventricular assistance with a ventricular assist device (VAD) or on extracorporeal membrane oxygenation (ECMO) with a pump-oxygenator system. While MAC provides short-term (days to weeks) support and long-term (months to years) for the heart and/or lungs, the blood is inevitably exposed to non-physiological shear stress (NPSS) due to mechanical pumping action and in contact with artificial surfaces. NPSS is well known to cause blood damage and functional alterations of blood cells. In this review, we discussed shear-induced platelet adhesion, platelet aggregation, platelet receptor shedding, and platelet apoptosis, shear-induced acquired von Willebrand syndrome (AVWS), shear-induced hemolysis and microparticle formation during MAC. These alterations are associated with perioperative bleeding and thrombotic events, morbidity and mortality, and quality of life in MCS patients. Understanding the mechanism of shear-induce hemostatic disorders will help us develop low-shear-stress devices and select more effective treatments for better clinical outcomes.
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Affiliation(s)
- Shigang Wang
- Department of Surgery, 12264University of Maryland School of Medicine, Baltimore, MD, USA
| | - Bartley P Griffith
- Department of Surgery, 12264University of Maryland School of Medicine, Baltimore, MD, USA
| | - Zhongjun J Wu
- Department of Surgery, 12264University of Maryland School of Medicine, Baltimore, MD, USA.,Fischell Department of Bioengineering, A. James Clark School of Engineering, University of Maryland, College Park, MD, USA
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9
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Roka-Moiia Y, Miller-Gutierrez S, Palomares DE, Italiano JE, Sheriff J, Bluestein D, Slepian MJ. Platelet Dysfunction During Mechanical Circulatory Support: Elevated Shear Stress Promotes Downregulation of α IIbβ 3 and GPIb via Microparticle Shedding Decreasing Platelet Aggregability. Arterioscler Thromb Vasc Biol 2021; 41:1319-1336. [PMID: 33567867 DOI: 10.1161/atvbaha.120.315583] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Yana Roka-Moiia
- Department of Medicine (Y.R.-M., S.M.-G.), Sarver Heart Center, University of Arizona, Tucson
| | - Samuel Miller-Gutierrez
- Department of Medicine (Y.R.-M., S.M.-G.), Sarver Heart Center, University of Arizona, Tucson
| | - Daniel E Palomares
- Department of Biomedical Engineering (D.E.P., M.J.S.), Sarver Heart Center, University of Arizona, Tucson
| | - Joseph E Italiano
- Brigham and Woman's Hospital, Harvard Medical School, Boston, MA (J.E.I.)
| | - Jawaad Sheriff
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY (J.S., D.B., M.J.S.)
| | - Danny Bluestein
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY (J.S., D.B., M.J.S.)
| | - Marvin J Slepian
- Department of Biomedical Engineering (D.E.P., M.J.S.), Sarver Heart Center, University of Arizona, Tucson.,Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY (J.S., D.B., M.J.S.)
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10
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Chen Z, Tran D, Li T, Arias K, Griffith BP, Wu ZJ. The Role of a Disintegrin and Metalloproteinase Proteolysis and Mechanical Damage in Nonphysiological Shear Stress-Induced Platelet Receptor Shedding. ASAIO J 2020; 66:524-531. [PMID: 31192844 DOI: 10.1097/mat.0000000000001028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
In order to explore the role of a disintegrin and metalloproteinase (ADAM) proteolysis and direct mechanical damage in non-physiologic shear stress (NPSS)-caused platelet receptor shedding, the healthy donor blood treated with/without ADAM inhibitor was exposed to NPSS (150 Pa). The expression of the platelet surface receptors glycoprotein (GP) Ibα and glycoprotein (GP) VI (GPVI) in NPSS-damaged blood was quantified with flow cytometry. The impact of ADAM inhibition on adhesion of NPSS-damaged platelets on von Willibrand factor (VWF) and collagen was explored with fluorescence microscopy. The impact of ADAM inhibition on ristocetin- and collagen-caused aggregation of NPSS-damaged platelets was examined by aggregometry. The results showed that ADAM inhibition could lessen the NPSS-induced loss of platelet surface receptor GPIbα (12%) and GPVI (9%), moderately preserve adhesion of platelets on VWF (7.4%) and collagen (8.4%), and partially restore the aggregation of NPSS-sheared platelets induced by ristocetin (18.6 AU*min) and collagen (48.2 AU*min). These results indicated that ADAM proteolysis played a role in NPSS-induced receptor shedding. However, the ADAM inhibition couldn't completely suppress the NPSS-caused loss of the platelet surface receptors (GPIbα and GPVI), only partially prevented the NPSS-induced reduction of platelet adhesion to VWF and collagen, and the agonist (ristocetin and collagen)-caused platelet aggregation. These results suggested that the direct mechanical damage is partially responsible for NPSS-induced receptor shedding in addition to the ADAM proteolysis. In conclusion, NPSS relevant to blood contacting medical devices can induce ADAM proteolysis and direct mechanical damage on the platelet receptor GPIbα and GPVI, leading to comprised hemostasis.
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Affiliation(s)
- Zengsheng Chen
- Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, China.,Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Douglas Tran
- Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Tieluo Li
- Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Katherin Arias
- Fischell Department of Bioengineering, A. James Clark School of Engineering, University of Maryland, College Park, Maryland
| | - Bartley P Griffith
- Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Zhongjun J Wu
- Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland.,Fischell Department of Bioengineering, A. James Clark School of Engineering, University of Maryland, College Park, Maryland
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11
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Chen Z, Zhang J, Li T, Tran D, Griffith BP, Wu ZJ. The impact of shear stress on device-induced platelet hemostatic dysfunction relevant to thrombosis and bleeding in mechanically assisted circulation. Artif Organs 2019; 44:E201-E213. [PMID: 31849074 DOI: 10.1111/aor.13609] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 11/18/2019] [Accepted: 11/20/2019] [Indexed: 12/21/2022]
Abstract
The aim of this study was to examine the impact of the nonphysiological shear stress (NPSS) on platelet hemostatic function relevant to thrombosis and bleeding in mechanically assisted circulation. Fresh human blood was circulated for four hours in in vitro circulatory flow loops with a CentriMag blood pump operated under a flow rate of 4.5 L/min against three pressure heads (70 mm Hg, 150 mm Hg, and 350 mm Hg) at 2100, 2800, and 4000 rpm, respectively. Hourly blood samples from the CentriMag pump-assisted circulation loops were collected and analyzed for glycoprotein (GP) IIb/IIIa activation and receptor shedding of GPVI and GPIbα on the platelet surface with flow cytometry. Adhesion of platelets to fibrinogen, collagen, and von Willebrand factor (VWF) of the collected blood samples was quantified with fluorescent microscopy. In parallel, mechanical shear stress fields within the CentriMag pump operated under the three conditions were assessed by computational fluid dynamics (CFD) analysis. The experimental results showed that levels of platelet GPIIb/IIIa activation and platelet receptor shedding (GPVI and GPIbα) in the blood increased with increasing the circulation time. The levels of platelet activation and loss of platelet receptors GPVI and GPIbα were consistently higher with higher pressure heads at each increasing hour in the CentriMag pump-assisted circulation. The platelet adhesion on fibrinogen increased with increasing the circulation time for all three CentriMag operating conditions and was correlated well with the level of platelet activation. In contrast, the platelet adhesion on collagen and VWF decreased with increasing the circulation time under all the three conditions and was correlated well with the loss of the receptors GPVI and GPIbα on the platelet surface, respectively. The CFD results showed that levels of shear stresses inside the CentriMag pump under all three operating conditions exceeded the maximum level of shear stress in the normal physiological circulation and were strongly dependent on the pump operating condition. The level of platelet activation and loss of key platelet adhesion receptors (GPVI and GPIbα) were correlated with the level of NPSS generated by the CentriMag pump, respectively. In summary, the level of NPSS associated with pump operating condition is a critical determinant of platelet dysfunction in mechanically assisted circulation.
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Affiliation(s)
- Zengsheng Chen
- Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Jiafeng Zhang
- Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Tieluo Li
- Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Douglas Tran
- Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Bartley P Griffith
- Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
| | - Zhongjun J Wu
- Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland.,Fischell Department of Bioengineering, A. James Clark School of Engineering, University of Maryland, College Park, Maryland
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12
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Quantitative Characterization of Shear-Induced Platelet Receptor Shedding: Glycoprotein Ibα, Glycoprotein VI, and Glycoprotein IIb/IIIa. ASAIO J 2019; 64:773-778. [PMID: 29117043 DOI: 10.1097/mat.0000000000000722] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The structural integrity of platelet receptors is essential for platelets to play the normal hemostatic function. The high non-physiologic shear stress (NPSS) commonly exists in blood-contacting medical devices and has been shown to cause platelet receptor shedding. The loss of platelet receptors may impair the normal hemostatic function of platelets. The aim of this study was to quantify NPSS-induced shedding of three key receptors on the platelet surface. Human blood was subjected to the matrix of well-defined shear stresses and exposure times, generated by using a custom-designed blood-shearing device. The expression of three key platelet receptors, glycoprotein (GP) Ibα, GPVI, and GPIIb/IIIa, in sheared blood was quantified using flow cytometry. The quantitative relationship between the loss of each of the three receptors on the platelet surface and shear condition (shear stress level and exposure time) was explored. It was found that these relationships followed well the power law functional form. The coefficients of the power law models for the shear-induced shedding of these platelet receptors were derived with coefficients of determination (R) of 0.77, 0.73, and 0.78, respectively. The power law models with these coefficients may be potentially used to predict the shear-induced platelet receptor shedding of human blood.
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Chen Z, Zhang J, Kareem K, Tran D, Conway RG, Arias K, Griffith BP, Wu ZJ. Device-induced platelet dysfunction in mechanically assisted circulation increases the risks of thrombosis and bleeding. Artif Organs 2019; 43:745-755. [PMID: 30805954 DOI: 10.1111/aor.13445] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 01/28/2019] [Accepted: 02/21/2019] [Indexed: 12/24/2022]
Abstract
Thrombotic and bleeding complications are the major obstacles for expanding mechanical circulatory support (MCS) beyond the current use. While providing the needed hemodynamic support, those devices can induce damage to blood, particularly to platelets. In this study, we investigated device-induced alteration of three major platelet surface receptors, von Willebrand factor (VWF) and associated hemostatic functions relevant to thrombosis and bleeding. Fresh human whole blood was circulated in an extracorporeal circuit with a clinical rotary blood pump (CentriMag, Abbott, Chicago, IL, USA) under the clinically relevant operating condition for 4 hours. Blood samples were examined every hour for glycoprotein (GP) IIb/IIIa activation and receptor loss of GPVI and GPIbα on the platelet surface with flow cytometry. Soluble P-selectin in hourly collected blood samples was measured by enzyme linked immunosorbent assay to characterize platelet activation. Adhesion of device-injured platelets to fibrinogen, collagen, and VWF was quantified with fluorescent microscopy. Device-induced damage to VWF was characterized with western blotting. The CentriMag blood pump induced progressive platelet activation with blood circulating time. Particularly, GPIIb/IIIa activation increased from 1.1% (Base) to 11% (4 hours) and soluble P-selectin concentration increased from 14.1 ng/mL (Base) to 26.5 ng/mL (4 hours). Those device-activated platelets exhibited increased adhesion capacity to fibrinogen. Concurrently, the CentriMag blood pump caused progressive platelet receptor loss (GPVI and GPIbα) with blood circulating time. Specifically, MFI of the GPVI and GPIbα receptors decreased by 17.2% and 16.1% for the 4-hours sample compared to the baseline samples, respectively. The device-injured platelets exhibited reduced adhesion capacities to collagen and VWF. The high molecular weight multimers (HMWM) of VWF in the blood disappeared within the first hour of the circulation. Thereafter the multimeric patterns of VWF were stable. The change in the VWF multimeric pattern was different from the progressive structural and functional changes of platelets with the circulation time. This study suggested that the CentriMag blood pump could induce two opposite effects on platelets and associated hemostatic functions under a clinically relevant operating condition. The device-altered hemostatic function may contribute to thrombosis and bleeding simultaneously as occurring in patients supported by a rotary blood pump. Device-induced damage of platelets may be an important cause for bleeding in patients supported with rotary blood pump MCS systems relative to device-induced loss of HMWM-VWF.
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Affiliation(s)
- Zengsheng Chen
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Jiafeng Zhang
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Kafayat Kareem
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Douglas Tran
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Robert G Conway
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Katherin Arias
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA.,Fischell Department of Bioengineering, A. James Clark School of Engineering, University of Maryland, College Park, MD, USA
| | - Bartley P Griffith
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Zhongjun J Wu
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA.,Fischell Department of Bioengineering, A. James Clark School of Engineering, University of Maryland, College Park, MD, USA
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Protein kinase C signaling dysfunction in von Willebrand disease (p.V1316M) type 2B platelets. Blood Adv 2018; 2:1417-1428. [PMID: 29925524 DOI: 10.1182/bloodadvances.2017014290] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 05/17/2018] [Indexed: 01/22/2023] Open
Abstract
von Willebrand disease (VWD) type 2B is characterized by gain-of-function mutations in von Willebrand factor (VWF), enhancing its binding affinity for the platelet receptor glycoprotein (GP)Ibα. VWD type 2B patients display a bleeding tendency associated with loss of high-molecular-weight VWF multimers and variable thrombocytopenia. We recently demonstrated that a marked defect in agonist-induced activation of the small GTPase, Rap1, and integrin αIIbβ3 in VWD (p.V1316M) type 2B platelets also contributes to the bleeding tendency. Here, we investigated the molecular mechanisms underlying impaired platelet Rap1 signaling in this disease. Two distinct pathways contribute to Rap1 activation in platelets: rapid activation mediated by the calcium-sensing guanine nucleotide exchange factor CalDAG-GEF-I (CDGI) and sustained activation that is dependent on signaling by protein kinase C (PKC) and the adenosine 5'-diphosphate receptor P2Y12. To investigate which Rap1 signaling pathway is affected, we expressed VWF/p.V1316M by hydrodynamic gene transfer in wild-type and Caldaggef1-/- mice. Using αIIbβ3 integrin activation as a read-out, we demonstrate that platelet dysfunction in VWD (p.V1316M) type 2B affects PKC-mediated, but not CDGI-mediated, activation of Rap1. Consistently, we observed decreased PKC substrate phosphorylation and impaired granule release in stimulated VWD type 2B platelets. Interestingly, the defect in PKC signaling was caused by a significant increase in baseline PKC substrate phosphorylation in circulating VWD (p.V1316M) type 2B platelets, suggesting that the VWF-GPIbα interaction leads to preactivation and exhaustion of the PKC pathway. Consistent with PKC preactivation, VWD (p.V1316M) type 2B mice also exhibited marked shedding of platelet GPIbα. In summary, our studies identify altered PKC signaling as the underlying cause of platelet hypofunction in p.V1316M-associated VWD type 2B.
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15
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Muslem R, Caliskan K, Leebeek FWG. Acquired coagulopathy in patients with left ventricular assist devices. J Thromb Haemost 2018; 16:429-440. [PMID: 29274191 DOI: 10.1111/jth.13933] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Indexed: 08/31/2023]
Abstract
Chronic heart failure (HF) is a major emerging healthcare problem, associated with a high morbidity and mortality. Left ventricular assist devices (LVADs) have emerged as a successful treatment option for patients with end-stage HF. Despite its great benefit, the use of LVAD is associated with a high risk of complications. Bleeding, pump thrombosis and thromboembolic events are frequently observed complications, with bleeding complications occurring in over a third of the patients. Although the design of the third-generation LVAD has improved greatly, these hemostatic complications still occur. The introduction of an LVAD into the circulatory system results in an altered hematological balance as a consequence of blood-pump interactions, changes in hemodynamics, the rheology, and the concomitant need for anticoagulation while implanted with an LVAD. The majority, if not all, LVAD patients experience a form of platelet dysfunction and impaired von Willebrand factor activity, leading to acquired coagulopathy disorders. Different diagnostic tools and treatment strategies have been reported; however, they require validation in LVAD patients. The present review focuses on acquired coagulopathies, describing the incidence, impact and underlying mechanism of acquired coagulopathy disorders in patients supported by LVADs. In addition, we will discuss diagnostic and management strategies for these acquired coagulopathies.
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Affiliation(s)
- R Muslem
- Department of Cardiothoracic Surgery, Erasmus MC, University Medical Center Rotterdam, Rotterdam, the Netherlands
- Department of Cardiology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, the Netherlands
| | - K Caliskan
- Department of Cardiology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, the Netherlands
| | - F W G Leebeek
- Department of Hematology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, the Netherlands
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Aponte-Santamaría C, Obser T, Grässle S, Oyen F, Budde U, Schneppenheim S, Baldauf C, Gräter F, Schneider SW, Schneppenheim R, Brehm MA, Huck V. von Willebrand disease type 2A phenotypes IIC, IID and IIE: A day in the life of shear-stressed mutant von Willebrand factor. Thromb Haemost 2017; 112:96-108. [DOI: 10.1160/th13-11-0902] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Accepted: 02/11/2014] [Indexed: 11/05/2022]
Abstract
SummaryThe bleeding disorder von Willebrand disease (VWD) is caused by mutations of von Willebrand factor (VWF), a multimeric glycoprotein essential for platelet-dependent primary haemostasis. VWD type 2A–associated mutations each disrupt VWF biosynthesis and function at different stages, depending on the VWF domain altered by the mutation. These effects cause considerable heterogeneity in phenotypes and symptoms. To characterise the molecular mechanisms underlying the specific VWF deficiencies in VWD 2A/IIC, IID and IIE, we investigated VWF variants with patient-derived mutations either in the VWF pro-peptide or in domains D3 or CK. Additionally to static assays and molecular dynamics (MD) simulations we used microfluidic approaches to perform a detailed investigation of the shear-dependent function of VWD 2A mutants. For each group, we found distinct characteristics in their intracellular localisation visualising specific defects in biosynthesis which are correlated to respective multimer patterns. Using microfluidic assays we further determined shear flow-dependent characteristics in polymer-platelet-aggregate formation, platelet binding and string formation for all mutants. The phenotypes observed under flow conditions were not related to the mutated VWF domain. By MD simulations we further investigated how VWD 2A/IID mutations might alter the ability of VWF to form carboxy-terminal dimers. In conclusion, our study offers a comprehensive picture of shear-dependent and shear-independent dysfunction of VWD type 2A mutants. Furthermore, our microfluidic assay might open new possibilities for diagnosis of new VWD phenotypes and treatment choice for VWD patients with shear-dependent VWF dysfunctions that are currently not detectable by static tests.
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17
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Chen Z, Mondal NK, Zheng S, Koenig SC, Slaughter MS, Griffith BP, Wu ZJ. High shear induces platelet dysfunction leading to enhanced thrombotic propensity and diminished hemostatic capacity. Platelets 2017; 30:112-119. [PMID: 29182470 DOI: 10.1080/09537104.2017.1384542] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Thrombosis and bleeding are devastating adverse events in patients supported with blood-contacting medical devices (BCMDs). In this study, we delineated that high non-physiological shear stress (NPSS) caused platelet dysfunction that may contribute to both thrombosis and bleeding. Human blood was subjected to NPSS with short exposure time. Levels of platelet surface GPIbα and GPVI receptors as well as activation level of GPIIb/IIIa in NPSS-sheared blood were examined with flow cytometry. Adhesion of sheared platelets on fibrinogen, von Willibrand factor (VWF), and collagen was quantified with fluorescent microscopy. Ristocetin- and collagen-induced platelet aggregation was characterized by aggregometry. NPSS activated platelets in a shear and exposure time-dependent manner. The number of activated platelets increased with increasing levels of NPSS and exposure time, which corresponded well with increased adhesion of sheared platelets on fibrinogen. Concurrently, NPSS caused shedding of GPIbα and GPVI in a manner dependent on shear and exposure time. The loss of intact GPIbα and GPVI increased with increasing levels of NPSS and exposure time. The number of platelets adhered on VWF and collagen decreased with increasing levels of NPSS and exposure time, respectively. The decrease in the number of platelets adhered on VWF and collagen corresponded well with the loss in GPIbα and GPVI on platelet surface. Both ristocetin- and collagen-induced platelet aggregation in sheared blood decreased with increasing levels of NPSS and exposure time. The study clearly demonstrated that high NPSS causes simultaneous platelet activation and receptor shedding, resulting in a paradoxical effect on platelet function via two distinct mechanisms. The results from the study suggested that the NPSS could induce the concurrent propensity for both thrombosis and bleeding in patients.
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Affiliation(s)
- Zengsheng Chen
- a Department of Surgery , University of Maryland School of Medicine , Baltimore , MD , USA
| | - Nandan K Mondal
- b Department of Cardiovascular and Thoracic Surgery , School of Medicine, University of Louisville , Louisville , KY , USA
| | - Shirong Zheng
- b Department of Cardiovascular and Thoracic Surgery , School of Medicine, University of Louisville , Louisville , KY , USA
| | - Steven C Koenig
- b Department of Cardiovascular and Thoracic Surgery , School of Medicine, University of Louisville , Louisville , KY , USA.,c Department of Bioengineering , Speed School of Engineering, University of Louisville , Louisville , KY , USA
| | - Mark S Slaughter
- b Department of Cardiovascular and Thoracic Surgery , School of Medicine, University of Louisville , Louisville , KY , USA
| | - Bartley P Griffith
- a Department of Surgery , University of Maryland School of Medicine , Baltimore , MD , USA
| | - Zhongjun J Wu
- a Department of Surgery , University of Maryland School of Medicine , Baltimore , MD , USA.,d Fischell Department of Bioengineering , A. James Clark School of Engineering, University of Maryland , College Park , MD , USA
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18
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Alsmadi NZ, Shapiro SJ, Lewis CS, Sheth VM, Snyder TA, Schmidtke DW. Constricted microfluidic devices to study the effects of transient high shear exposure on platelets. BIOMICROFLUIDICS 2017; 11:064105. [PMID: 29204246 PMCID: PMC5705242 DOI: 10.1063/1.4989386] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 11/02/2017] [Indexed: 06/07/2023]
Abstract
Due to the critical roles that platelets play in thrombosis during many biological and pathological events, altered platelet function may be a key contributor to altered hemostasis, leading to both thrombotic and hemorrhagic complications. Platelet adhesion at arterial shear rates occurs through binding to von Willebrand Factor via the glycoprotein (GP) GPIb receptor. GPIb binding can induce platelet activation distinguishable by P-selectin (CD62P) surface expression and αIIbβ3 activation, resulting in platelet aggregation and formation of the primary hemostatic plug to stop bleeding. Previous studies have used cone and plate viscometers to examine pathologic blood flow conditions, applied shear rates that are relatively low, and examined exposure times that are orders of magnitude longer compared to conditions present in ventricular assist devices, mechanical heart valves, or pathologic states such as stenotic arteries. Here, we evaluate the effect of short exposure to high shear on granule release and receptor shedding utilizing a constricted microfluidic device in conjunction with flow cytometry and enzyme-linked immunosorbent assay. In this study, platelets were first perfused through microfluidic channels capable of producing shear rates of 80 000-100 000 s-1 for exposure times of 0-73 ms. We investigated platelet activation by measuring the expression level of CD62P (soluble and surface expressed), platelet factor 4 (PF4), and beta-thromboglobulin (βTG). In addition, we measured potential platelet receptor shedding of GPVI and GPIb using flow cytometry. The results showed that a single pass to high shear with short exposure times (milliseconds) had no effect on the levels of CD62P, GPVI and GPIb, or on the release of alpha granule content (PF4, βTG, and sP-selectin).
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Affiliation(s)
- Nesreen Z Alsmadi
- Department of Bioengineering, University of Texas at Dallas, Richardson, Texas 75083, USA
| | - Sarah J Shapiro
- School of Chemical, Biological, and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, USA
| | - Christopher S Lewis
- School of Chemical, Biological, and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, USA
| | - Vinit M Sheth
- Department of Bioengineering, University of Texas at Dallas, Richardson, Texas 75083, USA
| | | | - David W Schmidtke
- Department of Bioengineering, University of Texas at Dallas, Richardson, Texas 75083, USA
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19
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Tien WS, Chen JH, Wu KP. SheddomeDB: the ectodomain shedding database for membrane-bound shed markers. BMC Bioinformatics 2017; 18:42. [PMID: 28361715 PMCID: PMC5374707 DOI: 10.1186/s12859-017-1465-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND A number of membrane-anchored proteins are known to be released from cell surface via ectodomain shedding. The cleavage and release of membrane proteins has been shown to modulate various cellular processes and disease pathologies. Numerous studies revealed that cell membrane molecules of diverse functional groups are subjected to proteolytic cleavage, and the released soluble form of proteins may modulate various signaling processes. Therefore, in addition to the secreted protein markers that undergo secretion through the secretory pathway, the shed membrane proteins may comprise an additional resource of noninvasive and accessible biomarkers. In this context, identifying the membrane-bound proteins that will be shed has become important in the discovery of clinically noninvasive biomarkers. Nevertheless, a data repository for biological and clinical researchers to review the shedding information, which is experimentally validated, for membrane-bound protein shed markers is still lacking. RESULTS In this study, the database SheddomeDB was developed to integrate publicly available data of the shed membrane proteins. A comprehensive literature survey was performed to collect the membrane proteins that were verified to be cleaved or released in the supernatant by immunological-based validation experiments. From 436 studies on shedding, 401 validated shed membrane proteins were included, among which 199 shed membrane proteins have not been annotated or validated yet by existing cleavage databases. SheddomeDB attempted to provide a comprehensive shedding report, including the regulation of shedding machinery and the related function or diseases involved in the shedding events. In addition, our published tool ShedP was embedded into SheddomeDB to support researchers for predicting the shedding event on unknown or unrecorded membrane proteins. CONCLUSIONS To the best of our knowledge, SheddomeDB is the first database for the identification of experimentally validated shed membrane proteins and currently may provide the most number of membrane proteins for reviewing the shedding information. The database included membrane-bound shed markers associated with numerous cellular processes and diseases, and some of these markers are potential novel markers because they are not annotated or validated yet in other databases. SheddomeDB may provide a useful resource for discovering membrane-bound shed markers. The interactive web of SheddomeDB is publicly available at http://bal.ym.edu.tw/SheddomeDB/ .
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Affiliation(s)
- Wei-Sheng Tien
- Institute of Biomedical Informatics, National Yang Ming University, Taipei, 112, Taiwan.,Bioinformatics Program, Taiwan International Graduate Program, Academia Sinica, Taipei, 115, Taiwan
| | - Jun-Hong Chen
- Department of Computer Science, National Taipei University of Education, Taipei, 106, Taiwan
| | - Kun-Pin Wu
- Institute of Biomedical Informatics, National Yang Ming University, Taipei, 112, Taiwan.
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20
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Hosseini E, Ghasemzadeh M, Nassaji F, Jamaat ZP. GPVI modulation during platelet activation and storage: its expression levels and ectodomain shedding compared to markers of platelet storage lesion. Platelets 2016; 28:498-508. [PMID: 27778530 DOI: 10.1080/09537104.2016.1235692] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Platelet storage is associated with deleterious changes leading to the loss of platelet reactivity and response. During storage, platelets experience increased expression and shedding of P-selectin and CD40L as specific markers of platelet activation, whereas GPIbα decreases due to ectodomain shedding. As an important adhesive receptor, GPVI contributes significantly to thrombus formation while its expression and shedding levels during storage of platelet products have not been well characterized yet. This study investigated the modulation of GPVI during platelet storage. For this study, samples obtained from 10 PRP-platelet concentrates (PCs) were subjected to flow-cytometry analysis to examine the expression of platelet activation markers and GPVI on days 1, 3, and 5 post-storage. To examine the levels of etcodomain shedding of these molecules, microparticle (MP)-free supernatants were also analyzed by either ELISA or Western blot methods. According to results, the expression levels of P-selectin and CD40L as well as the amounts of their soluble forms significantly increased during storage. The expression of GPIbα and GPVI decreased whereas their shedding significantly increased post-storage. The expression and shedding levels of these two receptors were significantly correlated. Negative correlations between the expressions of GPIbα or GPVI and P-selectin have been observed whereas their shedding levels were significantly relevant together. In a control study, the use of biotinylated platelet resuspended in Tyrode's buffer in the presence of ionophore with/without EDTA, confirmed the role of calcium in receptors shedding. In citrated PRP-PCs, recalcification of platelets also enhanced shedding levels of both GPIbα and GPVI. Intriguingly, the shedding levels of GPVI in stored PRP-PCs were much higher than those of ionophore-treated controls obtained from washed platelets. The ratios of sGPVI in stored platelet to ionophore-treated controls were also at least six times higher than those of GPIbα during storage. In conclusion, here we showed significant decreases of GPVI expression associated with its increasing levels of shedding during storage, suggesting GPVI as a valid marker of platelet storage lesion. Importantly, we found higher levels of GPVI shedding in stored platelets than those of ionophore-treated non-stored control samples. This suggests whereas platelet receptor shedding is mainly modulated by calcium-dependent signals, either platelet-surface interactions with the container walls during storage or induced shear stress under long-term agitation, might be also involved in the excessive shedding of GPVI during the storage of PCs.
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Affiliation(s)
- Ehteramolsadat Hosseini
- a Blood Transfusion Research Center , High Institute for Research and Education in Transfusion Medicine , Tehran , Iran
| | - Mehran Ghasemzadeh
- a Blood Transfusion Research Center , High Institute for Research and Education in Transfusion Medicine , Tehran , Iran.,b Australian Centre for Blood Diseases , Monash University , Melbourne , Australia
| | - Fatemeh Nassaji
- a Blood Transfusion Research Center , High Institute for Research and Education in Transfusion Medicine , Tehran , Iran
| | - Zeynab Pirmohammad Jamaat
- a Blood Transfusion Research Center , High Institute for Research and Education in Transfusion Medicine , Tehran , Iran
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21
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Au AE, Josefsson EC. Regulation of platelet membrane protein shedding in health and disease. Platelets 2016; 28:342-353. [PMID: 27494300 DOI: 10.1080/09537104.2016.1203401] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Extracellular proteolysis of platelet plasma membrane proteins is an event that ensues platelet activation. Shedding of surface receptors such as glycoprotein (GP) Ibα, GPV and GPVI as well as externalized proteins P-selectin and CD40L releases soluble ectodomain fragments that are subsequently detectable in plasma. This results in the irreversible functional downregulation of platelet receptor-mediated adhesive interactions and the generation of biologically active fragments. In this review, we describe molecular insights into the regulation of platelet receptor and ligand shedding in health and disease. The scope of this review is specially focused on GPIbα, GPV, GPVI, P-selectin and CD40L where we: (1) describe the basic physiological regulation of expression and shedding of these proteins in hemostasis illustrate alterations in receptor expression during (2) apoptosis and (3) ex vivo storage relevant for blood banking purposes; (4) discuss considerations to be made when analyzing and interpreting shedding of platelet membrane proteins and finally; (5) collate clinical evidence that quantify these platelet proteins during disease.
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Affiliation(s)
- Amanda E Au
- a The Walter and Eliza Hall Institute of Medical Research, Cancer & Haematology Division , 1G Royal Parade, Melbourne , Australia.,b Department of Medical Biology , The University of Melbourne , Melbourne , Australia
| | - Emma C Josefsson
- a The Walter and Eliza Hall Institute of Medical Research, Cancer & Haematology Division , 1G Royal Parade, Melbourne , Australia.,b Department of Medical Biology , The University of Melbourne , Melbourne , Australia
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22
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Chen Z, Mondal NK, Ding J, Koenig SC, Slaughter MS, Wu ZJ. Paradoxical Effect of Nonphysiological Shear Stress on Platelets and von Willebrand Factor. Artif Organs 2015; 40:659-68. [PMID: 26582038 DOI: 10.1111/aor.12606] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Blood can become hypercoagulable by shear-induced platelet activation and generation of microparticles. It has been reported that nonphysiological shear stress (NPSS) could induce shedding of platelet receptor glycoprotein (GP) Ibα, which may result in an opposite effect to hemostasis. The aim of this study was to investigate the influence of the NPSS on platelets and von Willebrand factor (vWF). Human blood was exposed to two levels of NPSS (25 Pa, 125 Pa) with an exposure time of 0.5 s, generated by using a novel blood-shearing device. Platelet activation (P-selectin expression, GPIIb/IIIa activation and generation of microparticles) and shedding of three platelet receptors (GPIbα, GPVI, GPIIb/IIIa) in sheared blood were quantified using flow cytometry. Aggregation capacity of sheared blood induced by ristocetin and collagen was evaluated using an aggregometer. Shear-induced vWF damage was characterized with Western blotting. Consistent with the published data, the NPSS caused significantly more platelets to become activated with increasing NPSS level. Meanwhile, the NPSS induced the shedding of platelet receptors. The loss of the platelet receptors increased with increasing NPSS level. The aggregation capacity of sheared blood induced by ristocetin and collagen decreased. There was a loss of high molecular weight multimers (HMWMs) of vWF in sheared blood. These results suggest that the NPSS induced a paradoxical effect. More activated platelets increase the risk of thrombosis, while the reduction in platelet receptors and the loss of HMWM-vWF increased the propensity of bleeding. The finding might provide a new perspective to understand thrombosis and acquired bleeding disorder in patients supported with blood contacting medical devices.
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Affiliation(s)
- Zengsheng Chen
- Department of Cardiovascular and Thoracic Surgery, University of Louisville School of Medicine, Louisville, KY, USA.,Department of Engineering Mechanics, School of Aerospace, Tsinghua University, Beijing, China
| | - Nandan K Mondal
- Department of Cardiovascular and Thoracic Surgery, University of Louisville School of Medicine, Louisville, KY, USA
| | - Jun Ding
- Department of Cardiovascular and Thoracic Surgery, University of Louisville School of Medicine, Louisville, KY, USA.,Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD, USA
| | - Steven C Koenig
- Department of Cardiovascular and Thoracic Surgery, University of Louisville School of Medicine, Louisville, KY, USA
| | - Mark S Slaughter
- Department of Cardiovascular and Thoracic Surgery, University of Louisville School of Medicine, Louisville, KY, USA
| | - Zhongjun J Wu
- Department of Cardiovascular and Thoracic Surgery, University of Louisville School of Medicine, Louisville, KY, USA
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23
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Chen Z, Mondal NK, Ding J, Koenig SC, Slaughter MS, Griffith BP, Wu ZJ. Activation and shedding of platelet glycoprotein IIb/IIIa under non-physiological shear stress. Mol Cell Biochem 2015; 409:93-101. [PMID: 26160282 DOI: 10.1007/s11010-015-2515-y] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2015] [Accepted: 07/04/2015] [Indexed: 01/14/2023]
Abstract
The purpose of this study was to investigate the influence of non-physiological high shear stress on activation and shedding of platelet GP IIb/IIIa receptors. The healthy donor blood was exposed to three levels of high shear stresses (25, 75, 125 Pa) from the physiological to non-physiological status with three short exposure time (0.05, 0.5, 1.5 s), created by a specific blood shearing system. The activation and shedding of the platelet GPIIb/IIIa were analyzed using flow cytometry and enzyme-linked immunosorbent assay. In addition, platelet P-selectin expression of sheared blood, which is a marker for activated platelets, was also analyzed. The results from the present study showed that the number of activated platelets, as indicated by the surface GPIIb/IIIa activation and P-selectin expression, increased with increasing the shear stress level and exposure time. However, the mean fluorescence of GPIIb/IIIa on the platelet surface, decreased with increasing the shear stress level and exposure time. The reduction of GPIIb/IIIa on the platelet surface was further proved by the reduction of further activated platelet GPIIb/IIIa surface expression induced by ADP and the increase in GPIIb/IIIa concentration in microparticle-free plasma with increasing the applied shear stress and exposure time. It is clear that non-physiological shear stress induce a paradoxical phenomenon, in which both activation and shedding of the GPIIb/IIIa on the platelet surface occur simultaneously. This study may offer a new perspective to explain the reason of both increased thrombosis and bleeding events in patients implanted with high shear blood-contacting medical devices.
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Affiliation(s)
- Zengsheng Chen
- Department of Cardiovascular and Thoracic Surgery, Cardiovascular Innovation Institute, University of Louisville School of Medicine, Room 410, 302 E. Muhammad Ali Blvd, Louisville, KY, 40202, USA.,Department of Engineering Mechanics, School of Aerospace, Tsinghua University, Beijing, 100084, China
| | - Nandan K Mondal
- Department of Cardiovascular and Thoracic Surgery, Cardiovascular Innovation Institute, University of Louisville School of Medicine, Room 410, 302 E. Muhammad Ali Blvd, Louisville, KY, 40202, USA
| | - Jun Ding
- Department of Cardiovascular and Thoracic Surgery, Cardiovascular Innovation Institute, University of Louisville School of Medicine, Room 410, 302 E. Muhammad Ali Blvd, Louisville, KY, 40202, USA.,Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
| | - Steven C Koenig
- Department of Cardiovascular and Thoracic Surgery, Cardiovascular Innovation Institute, University of Louisville School of Medicine, Room 410, 302 E. Muhammad Ali Blvd, Louisville, KY, 40202, USA
| | - Mark S Slaughter
- Department of Cardiovascular and Thoracic Surgery, Cardiovascular Innovation Institute, University of Louisville School of Medicine, Room 410, 302 E. Muhammad Ali Blvd, Louisville, KY, 40202, USA
| | - Bartley P Griffith
- Department of Surgery, School of Medicine, University of Maryland, Baltimore, MD, 21201, USA
| | - Zhongjun J Wu
- Department of Cardiovascular and Thoracic Surgery, Cardiovascular Innovation Institute, University of Louisville School of Medicine, Room 410, 302 E. Muhammad Ali Blvd, Louisville, KY, 40202, USA.
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Ding J, Niu S, Chen Z, Zhang T, Griffith BP, Wu ZJ. Shear-Induced Hemolysis: Species Differences. Artif Organs 2015; 39:795-802. [PMID: 25899978 DOI: 10.1111/aor.12459] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The nonphysiological mechanical shear stress in blood-contacting medical devices is one major factor to device-induced blood damage. Animal blood is often used to test device-induced blood damage potential of these devices due to its easy accessibility and low cost. However, the differences in shear-induced blood damage between animals and human have not been well characterized. The purpose of this study was to investigate shear-induced hemolysis of human and three commonly used preclinical evaluation animal species (ovine, porcine, and bovine) under shear conditions encountered in blood-contacting medical devices. Shear-induced hemolysis experiments were conducted using two single-pass blood-shearing devices. Driven by an externally pressurized reservoir, blood single-passes through a small annular gap in the shearing devices where the blood was exposed to a uniform high shear stress. Shear-induced hemolysis at different conditions of exposure time (0.04 to 1.5 s) and shear stress (25 to 320 Pa) was quantified for ovine, porcine, bovine, and human blood, respectively. Within these ranges of shear stress and exposure time, shear-induced hemolysis was less than 2% for the four species. The results showed that the ovine blood was more susceptible to shear-induced injury than the bovine, porcine, and human blood. The response of the porcine and bovine blood to shear was similar to the human blood. The dependence of hemolysis on shear stress level and exposure time was found to fit well the power law functional form for the four species. The coefficients of the power law models for the ovine, porcine, bovine, and human blood were derived.
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Affiliation(s)
- Jun Ding
- Artificial Organs Laboratory, Department of Surgery, University of Maryland School of Medicine, Baltimore County, Baltimore, MD, USA.,Department of Mechanical Engineering, University of Maryland, Baltimore County, Baltimore, MD, USA
| | - Shuqiong Niu
- Artificial Organs Laboratory, Department of Surgery, University of Maryland School of Medicine, Baltimore County, Baltimore, MD, USA
| | - Zengsheng Chen
- Artificial Organs Laboratory, Department of Surgery, University of Maryland School of Medicine, Baltimore County, Baltimore, MD, USA
| | - Tao Zhang
- Artificial Organs Laboratory, Department of Surgery, University of Maryland School of Medicine, Baltimore County, Baltimore, MD, USA
| | - Bartley P Griffith
- Artificial Organs Laboratory, Department of Surgery, University of Maryland School of Medicine, Baltimore County, Baltimore, MD, USA
| | - Zhongjun J Wu
- Artificial Organs Laboratory, Department of Surgery, University of Maryland School of Medicine, Baltimore County, Baltimore, MD, USA
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Chen Z, Mondal NK, Ding J, Gao J, Griffith BP, Wu ZJ. Shear-induced platelet receptor shedding by non-physiological high shear stress with short exposure time: glycoprotein Ibα and glycoprotein VI. Thromb Res 2015; 135:692-8. [PMID: 25677981 DOI: 10.1016/j.thromres.2015.01.030] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 01/01/2015] [Accepted: 01/30/2015] [Indexed: 11/17/2022]
Abstract
INTRODUCTION The structural integrity of platelet receptors is essential for platelets to function normally in hemostasis and thrombosis in response to physiological and pathological stimuli. The aim of this study was to examine the shedding of two key platelet receptors, glycoprotein (GP) Ibα and GPVI, after exposed to the non-physiological high shear stress environment which commonly exists in blood contacting medical devices and stenotic blood vessels. MATERIALS AND METHODS In this in vitro experiment, we exposed healthy donor blood in our specially designed blood shearing device to three high shear stress levels (150, 225, 300 Pa) in combination with two short exposure time conditions (0.05 and 0.5 sec.). The expression and shedding of platelet GPIbα and GPVI receptors in the sheared blood samples were characterized using flow cytometry. The ability of platelet aggregation induced by ristocetin and collagen related to GPIbα and GPVI in the sheared blood samples, respectively, was evaluated by aggregometry. RESULTS AND CONCLUSIONS Compared to the normal blood, the surface expression of platelet GPIbα and GPVI in the sheared blood significantly decreased with increasing shear stress and exposure time. Moreover, the platelet aggregation induced by ristocetin and collagen reduced remarkably in a similar fashion. In summary non-physiological high shear stresses with short exposure time can induce shedding of platelet GPIbα and GPVI receptors, which may lead platelet dysfunction and influence the coagulation system. This study may provide a mechanistic insight into the platelet dysfunction and associated bleeding complication in patients supported by certain blood contacting medical devices.
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Affiliation(s)
- Zengsheng Chen
- Artificial Organs Laboratory, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Nandan K Mondal
- Artificial Organs Laboratory, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Jun Ding
- Artificial Organs Laboratory, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Mechanical Engineering, University of Maryland, Baltimore County, Baltimore, MD 21250, USA
| | - Jingya Gao
- Department of Chemistry and Biochemistry, School of Science, Siena College, Loudonville, NY 12211, USA
| | - Bartley P Griffith
- Artificial Organs Laboratory, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Zhongjun J Wu
- Artificial Organs Laboratory, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
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Berndt MC, Metharom P, Andrews RK. Primary haemostasis: newer insights. Haemophilia 2014; 20 Suppl 4:15-22. [PMID: 24762270 DOI: 10.1111/hae.12427] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/06/2014] [Indexed: 12/18/2022]
Abstract
At the same time as biophysical and omics approaches are drilling deeper into the molecular details of platelets and other blood cells, as well as their receptors and mechanisms of regulation, there is also an increasing awareness of the functional overlap between human vascular systems. Together, these studies are redefining the intricate networks linking haemostasis and thrombosis with inflammation, infectious disease, cancer/metastasis and other vascular pathophysiology. The focus of this state-of-the-art review is some of the newer advances relevant to primary haemostasis. Of particular interest, platelet-specific primary adhesion-signalling receptors and associated activation pathways control platelet function in flowing blood and provide molecular links to other systems. Platelet glycoprotein (GP)Ibα of the GPIb-IX-V complex and GPVI not only initiate platelet aggregation and thrombus formation by primary interactions with von Willebrand factor and collagen, respectively, but are also involved in coagulation, leucocyte engagement, bacterial or viral interactions, and are relevant as potential risk markers in a range of human diseases. Understanding these systems in unprecedented detail promises significant advances in evaluation of individual risk, in new diagnostic or therapeutic possibilities and in monitoring the response to drugs or other treatment.
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Affiliation(s)
- M C Berndt
- Faculty of Health Sciences, Curtin University, Perth, Western Australia, Australia
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Abstract
Atherosclerosis reduces platelet survival and thereby increases the percentage of younger platelets in the circulation assuming steady-state thrombocytopoiesis. We hypothesized that younger platelets have an increased propensity for arterial thrombus participation compared to older counterparts. Platelet-rich thrombi were generated by perfusing human heparinized whole blood from normal donors over arterial cross-sections under shear conditions (3,350 s(-1)) corresponding to significant coronary artery stenosis using a perfusion chamber. Harvested thrombi were disaggregated, stained with thiazole orange, anti-integrin β3, glycoprotein (GP) Ibα, GP IX and P-selectin, and compared to paired whole blood samples from the same donor by flow cytometry. Thiazole orange staining intensity provides a measure of platelet m-RNA content and age. Thiazole orange staining intensity (MN ± SEM) of platelets harvested from thrombi (62 ± 13) was twofold greater compared to paired intra-individual whole blood samples (31 ± 1). Integrin β3 receptor density was also greater for thrombus platelets (12.0 ± 1.0) compared to whole blood platelets (7.0 ± 0.6; p < 0.0001). GPs Ibα and IX were reduced from thrombus platelets possibly reflecting shedding. Younger "reticulated" platelets appear to have a greater propensity for thrombus participation under shear conditions of coronary artery stenosis compared to older counterparts. This predisposition may be explained by an increased receptor density of integrin β3 in younger platelets. By this mechanism, the atherosclerotic process may enhance the individual propensity for arterial thrombosis.
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Platelet receptor expression and shedding: glycoprotein Ib-IX-V and glycoprotein VI. Transfus Med Rev 2014; 28:56-60. [PMID: 24674813 DOI: 10.1016/j.tmrv.2014.03.001] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 03/04/2014] [Accepted: 03/04/2014] [Indexed: 01/13/2023]
Abstract
Quantity, quality, and lifespan are 3 important factors in the physiology, pathology, and transfusion of human blood platelets. The aim of this review is to discuss the proteolytic regulation of key platelet-specific receptors, glycoprotein(GP)Ib and GPVI, involved in the function of platelets in hemostasis and thrombosis, and nonimmune or immune thrombocytopenia. The scope of the review encompasses the basic science of platelet receptor shedding, practical aspects related to laboratory analysis of platelet receptor expression/shedding, and clinical implications of using the proteolytic fragments as platelet-specific biomarkers in vivo in terms of platelet function and clearance. These topics can be relevant to platelet transfusion regarding both changes in platelet receptor expression occurring ex vivo during platelet storage and/or clinical use of platelets for transfusion. In this regard, quantitative analysis of platelet receptor profiles on blood samples from individuals could ultimately enable stratification of bleeding risk, discrimination between causes of thrombocytopenia due to impaired production vs enhanced clearance, and monitoring of response to treatment prior to change in platelet count.
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Huck V, Schneider MF, Gorzelanny C, Schneider SW. The various states of von Willebrand factor and their function in physiology and pathophysiology. Thromb Haemost 2014; 111:598-609. [PMID: 24573248 DOI: 10.1160/th13-09-0800] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Accepted: 02/08/2014] [Indexed: 11/05/2022]
Abstract
The specific interactions of von Willebrand factor (VWF) with the vessel wall, platelets or other interfaces strongly depend on (a shear-induced) VWF activation. Shear flow has been shown to induce a conformational transition of VWF, but is modulated by its thermodynamic state (state-function relationship). The state in turn is determined by physical (e.g. vessel geometry), physico-chemical (e.g. pH) and molecular-biological (e.g. mutants, binding) factors. Combining established results with recent insights, we reconstruct VWF biology and its state-function relationship from endothelial cell release to final degradation in the human vasculature. After VWF secretion, endothelial-anchored and shear activated VWF multimers can rapidly interact with surrounding colloids, typically with platelets. Simultaneously, this VWF activation enables ADAMTS13 to cleave VWF multimers thereby limiting VWF binding capacity. The subsequent cell-surface dissociation leads to a VWF recoiling to a globular conformation, shielding from further degradation by ADAMTS13. High local concentrations of these soluble VWF multimers, transported to the downstream vasculature, are capable for an immediate reactivation and re-polymerisation initiating colloid-binding or VWF-colloid aggregation at the site of inflamed endothelium, vessel injuries or pathological high-shear areas. Focusing on these functional steps in the lifecycle of VWF, its qualitative and quantitative deficiencies in the different VWD types will facilitate more precise diagnostics and reliable risk stratification for prophylactic therapies. The underlying biophysical principles are of general character, which broadens prospective studies on the physiological and pathophysiological impact of VWF and VWF-associated diseases and beares hope for a more universal understanding of an entire class of phenomena.
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Affiliation(s)
| | - Matthias F Schneider
- Prof. Dr. Matthias F. Schneider, Biological Physics Group, Boston University, Department of Mechanical Engineering, 110 Cummington Street, Boston, MA 02215, USA, Tel.: +1 617 353 3951, Fax: +1 617 353 3951, E-mail:
| | | | - Stefan W Schneider
- Prof. Dr. Stefan W. Schneider, Department of Dermatology, Experimental Dermatology, Heidelberg University, Medical Faculty Mannheim, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany, Tel: +49 621 383 6901, Fax:+49 621 383 6903, E-mail:
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Yin W, Rouf F, Shanmugavelayudam SK, Rubenstein DA. Endothelial Cells Modulate Platelet Response to Dynamic Shear Stress. Cardiovasc Eng Technol 2014. [DOI: 10.1007/s13239-014-0178-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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31
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Hu J, Mondal NK, Sorensen EN, Cai L, Fang HB, Griffith BP, Wu ZJ. Platelet glycoprotein Ibα ectodomain shedding and non-surgical bleeding in heart failure patients supported by continuous-flow left ventricular assist devices. J Heart Lung Transplant 2013; 33:71-9. [PMID: 24055626 DOI: 10.1016/j.healun.2013.08.013] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 08/11/2013] [Accepted: 08/15/2013] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Non-surgical bleeding (NSB) is a major complication among heart failure (HF) patients supported by continuous-flow left ventricular assist devices (CF-LVADs). Understanding the hemostatic defects contributing to NSB after CF-LVAD implantation is crucial for prevention of this adverse event. The aim of this study was to examine the link between platelet glycoprotein Ibα (GPIbα) ectodomain shedding and NSB in CF-LVAD recipients and to identify a potential biomarker of NSB. METHODS Serial blood samples were collected from 35 HF patients supported with CF-LVADs. Platelet function was evaluated by a platelet function analysis device and thromboelastography (TEG). Platelet GPIbα shedding, von Willebrand factor (vWF) antigen and vWF collagen binding capacity were determined using enzyme-linked immunosorbent assays (ELISAs). The structural analysis of vWF was performed by gel electrophoresis. These platelet function measures with vWF parameters of the patients who had NSB between 4 and 32 days after CF-LVAD implantation (bleeder) were analyzed against those without NSB (non-bleeder). Blood samples from 7 healthy individuals were collected to obtain healthy reference values for the laboratory assays. RESULTS Elevated GPIbα shedding was found to be a pre-existing condition in all HF patients prior to CF-LVAD implantation. Post-operative level of GPIbα shedding increased and remained elevated in the bleeder group, whereas a consistent decrease was found in the non-bleeder group. A receiver operating characteristic (ROC) analysis indicated that the level of GPIbα shedding had a predictive power of NSB in patients on CF-LVAD support. CONCLUSIONS Platelet GPIbα ectodomain shedding which attenuates platelet reactivity is associated with NSB. Plasma GPIbα level may potentially be used to refine bleeding risk stratification in CF-LVAD patients.
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Affiliation(s)
- Jingping Hu
- Artificial Organs Laboratory, Department of Surgery, University of Maryland, School of Medicine, Baltimore, Maryland
| | - Nandan K Mondal
- Artificial Organs Laboratory, Department of Surgery, University of Maryland, School of Medicine, Baltimore, Maryland
| | - Erik N Sorensen
- Department of Clinical Engineering, University of Maryland, Medical Center, Baltimore, Maryland
| | - Ling Cai
- Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland
| | - Hong-Bin Fang
- Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland
| | - Bartley P Griffith
- Artificial Organs Laboratory, Department of Surgery, University of Maryland, School of Medicine, Baltimore, Maryland
| | - Zhongjun J Wu
- Artificial Organs Laboratory, Department of Surgery, University of Maryland, School of Medicine, Baltimore, Maryland.
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32
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Fallah MA, Huck V, Niemeyer V, Desch A, Angerer JI, McKinnon TAJ, Wixforth A, Schneider SW, Schneider MF. Circulating but not immobilized N-deglycosylated von Willebrand factor increases platelet adhesion under flow conditions. BIOMICROFLUIDICS 2013; 7:44124. [PMID: 24404057 PMCID: PMC3772935 DOI: 10.1063/1.4819746] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Accepted: 08/13/2013] [Indexed: 05/10/2023]
Abstract
The role of von Willebrand factor (VWF) as a shear stress activated platelet adhesive has been related to a coiled-elongated shape conformation. The forces dominating this transition have been suggested to be controlled by the proteins polymeric architecture. However, the fact that 20% of VWF molecular weight originates from glycan moieties has so far been neglected in these calculations. In this study, we present a systematic experimental investigation on the role of N-glycosylation for VWF mediated platelet adhesion under flow. A microfluidic flow chamber with a stenotic compartment that allows one to mimic various physiological flow conditions was designed for the efficient analysis of the adhesion spectrum. Surprisingly, we found an increase in platelet adhesion with elevated shear rate, both qualitatively and quantitatively fully conserved when N-deglycosylated VWF (N-deg-VWF) instead of VWF was immobilized in the microfluidic channel. This has been demonstrated consistently over four orders of magnitude in shear rate. In contrast, when N-deg-VWF was added to the supernatant, an increase in adhesion rate by a factor of two was detected compared to the addition of wild-type VWF. It appears that once immobilized, the role of glycans is at least modified if not-as found here for the case of adhesion-negated. These findings strengthen the physical impact of the circulating polymer on shear dependent platelet adhesion events. At present, there is no theoretical explanation for an increase in platelet adhesion to VWF in the absence of its N-glycans. However, our data indicate that the effective solubility of the protein and hence its shape or conformation may be altered by the degree of glycosylation and is therefore a good candidate for modifying the forces required to uncoil this biopolymer.
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Affiliation(s)
- M A Fallah
- University of Augsburg, Chair of Experimental Physics I, 86159 Augsburg, Germany ; Department of Biophysical Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | - V Huck
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, 68167 Mannheim, Germany
| | - V Niemeyer
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, 68167 Mannheim, Germany
| | - A Desch
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, 68167 Mannheim, Germany
| | - J I Angerer
- University of Augsburg, Chair of Experimental Physics I, 86159 Augsburg, Germany
| | - T A J McKinnon
- Imperial College London, Hammersmith Hospital Campus, Department of Medicine, London W12 0NN, United Kingdom
| | - A Wixforth
- University of Augsburg, Chair of Experimental Physics I, 86159 Augsburg, Germany
| | - S W Schneider
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, 68167 Mannheim, Germany
| | - M F Schneider
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts 02215, USA
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Castellino FJ, Liang Z, Davis PK, Balsara RD, Musunuru H, Donahue DL, Smith DL, Sandoval-Cooper MJ, Ploplis VA, Walsh M. Abnormal whole blood thrombi in humans with inherited platelet receptor defects. PLoS One 2012; 7:e52878. [PMID: 23300803 PMCID: PMC3532496 DOI: 10.1371/journal.pone.0052878] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Accepted: 11/22/2012] [Indexed: 11/18/2022] Open
Abstract
To delineate the critical features of platelets required for formation and stability of thrombi, thromboelastography and platelet aggregation measurements were employed on whole blood of normal patients and of those with Bernard-Soulier Syndrome (BSS) and Glanzmann's Thrombasthenia (GT). We found that separation of platelet activation, as assessed by platelet aggregation, from that needed to form viscoelastic stable whole blood thrombi, occurred. In normal human blood, ristocetin and collagen aggregated platelets, but did not induce strong viscoelastic thrombi. However, ADP, arachidonic acid, thrombin, and protease-activated-receptor-1 and -4 agonists, stimulated both processes. During this study, we identified the genetic basis of a very rare double heterozygous GP1b deficiency in a BSS patient, along with a new homozygous GP1b inactivating mutation in another BSS patient. In BSS whole blood, ADP responsiveness, as measured by thrombus strength, was diminished, while ADP-induced platelet aggregation was normal. Further, the platelets of 3 additional GT patients showed very weak whole blood platelet aggregation toward the above agonists and provided whole blood thrombi of very low viscoelastic strength. These results indicate that measurements of platelet counts and platelet aggregability do not necessarily correlate with generation of stable thrombi, a potentially significant feature in patient clinical outcomes.
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Affiliation(s)
- Francis J Castellino
- W. M. Keck Center for Transgene Research, University of Notre Dame, Notre Dame, Indiana, United States of America.
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Maul TM, Wolff EL, Kuch BA, Rosendorff A, Morell VO, Wearden PD. Activated partial thromboplastin time is a better trending tool in pediatric extracorporeal membrane oxygenation. Pediatr Crit Care Med 2012; 13:e363-71. [PMID: 22940857 DOI: 10.1097/pcc.0b013e31825b582e] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES To determine whether activated partial thromboplastin times are a better heparin management tool than activated clotting times in pediatric extracorporeal membrane oxygenation. DESIGN A single-center retrospective analysis of perfusion and patient records. SETTING Academic pediatric tertiary care center. PATIENTS Pediatric patients (<21 yrs old) requiring extracorporeal membrane oxygenation support initiated at Children's Hospital of Pittsburgh. INTERVENTIONS None. MEASUREMENTS AND MAIN RESULTS Point-of-care activated clotting time and activated partial thromboplastin time values, clinical laboratory activated partial thromboplastin time values, weight-normalized heparin administration (units/kg/hr), and reported outcomes were collected for pediatric patients treated for cardiac and/or respiratory failure with extracorporeal membrane oxygenation. Spearman's ranked correlations were performed for each coagulation test compared to heparin dosage. The Bland-Altman test was used to determine the validity of the point-of-care activated partial thromboplastin time. Hazard analysis was conducted for outcomes and complications for patients whose heparin management was based on the clinical laboratory activated partial thromboplastin time or the activated clotting time. Only the clinical laboratory activated partial thromboplastin time showed a correlation (ρ = 0.40 vs. ρ = -0.04 for activated clotting time) with the heparin administration (units/kg/hr). Point-of-care activated partial thromboplastin time and activated partial thromboplastin time values correlated well (ρ = 0.76), with <5% of samples showing a difference outside 2 SDs, but differences in their absolute values (Δactivated partial thromboplastin time = 100 secs) preclude them from being interchangeable measures. Furthermore, despite no effective change in the mean activated clotting time, cardiac patients showed a significantly improved correlation to heparin dose for all coagulation tests (e.g., point-of-care activated partial thromboplastin time ρ = 0.60). Management of patients with the clinical laboratory activated partial thromboplastin time did not significantly affect patient survival rates but did significantly reduce bleeding complications and significantly increased clotting in the extracorporeal membrane oxygenation circuit. A hazard analysis demonstrated that bleeding complications were associated with an increased risk of mortality, whereas clotting complications in the extracorporeal membrane oxygenation circuit were not. CONCLUSIONS The activated clotting time is not an accurate monitoring tool for heparin management in pediatricextracorporeal membrane oxygenation. The point-of-care activated partial thromboplastin time correlates well with the clinical laboratory activated partial thromboplastin time but cannot be substituted for the clinical laboratory activated partial thromboplastin time values. Management of pediatric extracorporeal membrane oxygenation patients with the clinical laboratory activated partial thromboplastin time reduced bleeding complications which are associated with increases in mortality.
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Affiliation(s)
- Timothy M Maul
- Department of Cardiothoracic Surgery, Children's Hospital of Pittsburgh of University of Pittsburgh Medical Center, Pittsburgh, PA, USA
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35
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Luo GP, Ni B, Yang X, Wu YZ. von Willebrand factor: more than a regulator of hemostasis and thrombosis. Acta Haematol 2012; 128:158-69. [PMID: 22890291 DOI: 10.1159/000339426] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Accepted: 05/03/2012] [Indexed: 12/13/2022]
Abstract
von Willebrand factor (vWF) was first identified as an adhesive glycoprotein involved in hemostasis by Zimmermann in 1971. Since then, vWF has been shown to play a vital role in platelet adhesion, platelet binding to collagen and factor VIII protection. Recent studies have implicated vWF as a regulator of angiogenesis, smooth muscle cell proliferation, tumor cell metastasis and crosstalk in the immune system. In this review, we will discuss the aspects of vWF structure that facilitate its biological effects and speculate on its newly discovered and hypothesized roles in the pathogenesis of several diseases.
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Affiliation(s)
- Gui-Ping Luo
- Institute of Immunology, PLA, Third Military Medical University, Chongqing, PR China
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Pathologic shear triggers shedding of vascular receptors: a novel mechanism for down-regulation of platelet glycoprotein VI in stenosed coronary vessels. Blood 2012; 119:4311-20. [PMID: 22431567 DOI: 10.1182/blood-2011-10-386607] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Ligand-induced ectodomain shedding of glycoprotein VI (GPVI) is a metalloproteinase-dependent event. We examined whether shear force, in the absence of GPVI ligand, was sufficient to induce shedding of GPVI. Human-citrated platelet-rich plasma or washed platelets were subjected to increasing shear rates in a cone-plate viscometer, and levels of intact and cleaved GPVI were examined by Western blot and ELISA. Pathophysiologic shear rates (3000-10 000 seconds(-1)) induced platelet aggregation and metalloproteinase-dependent appearance of soluble GPVI ectodomain, and GPVI platelet remnant. Shedding of GPVI continued after transient exposure to shear. Blockade of α(IIb)β(3), GPIbα, or intracellular signaling inhibited shear-induced platelet aggregation but minimally affected shear-induced shedding of GPVI. Shear-induced GPVI shedding also occurred in platelet-rich plasma or washed platelets isolated from a von Willebrand disease type 3 patient with no detectable VWF, implying that shear-induced activation of platelet metalloproteinases can occur in the absence of GPVI and GPIbα ligands. Significantly elevated levels of sGPVI were observed in 10 patients with stable angina pectoris, with well-defined single vessel coronary artery disease and mean intracoronary shear estimates at 2935 seconds(-1) (peak shear, 19 224 seconds(-1)). Loss of GPVI in platelets exposed to shear has potential implications for the stability of a forming thrombus at arterial shear rates.
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Feghhi S, Sniadecki NJ. Mechanobiology of platelets: techniques to study the role of fluid flow and platelet retraction forces at the micro- and nano-scale. Int J Mol Sci 2011; 12:9009-30. [PMID: 22272117 PMCID: PMC3257114 DOI: 10.3390/ijms12129009] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Revised: 11/24/2011] [Accepted: 11/28/2011] [Indexed: 12/29/2022] Open
Abstract
Coagulation involves a complex set of events that are important in maintaining hemostasis. Biochemical interactions are classically known to regulate the hemostatic process, but recent evidence has revealed that mechanical interactions between platelets and their surroundings can also play a substantial role. Investigations into platelet mechanobiology have been challenging however, due to the small dimensions of platelets and their glycoprotein receptors. Platelet researchers have recently turned to microfabricated devices to control these physical, nanometer-scale interactions with a higher degree of precision. These approaches have enabled exciting, new insights into the molecular and biomechanical factors that affect platelets in clot formation. In this review, we highlight the new tools used to understand platelet mechanobiology and the roles of adhesion, shear flow, and retraction forces in clot formation.
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Affiliation(s)
- Shirin Feghhi
- Department of Mechanical Engineering, University of Washington, Stevens Way, Box 352600, Seattle, WA 98195, USA; E-Mail:
| | - Nathan J. Sniadecki
- Department of Mechanical Engineering, University of Washington, Stevens Way, Box 352600, Seattle, WA 98195, USA; E-Mail:
- Department of Bioengineering, University of Washington, 3720 15th Ave NE, Seattle, WA 98105, USA
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +1-206-685-6591; Fax: +1-206-685-8047
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Lev PR, Goette NP, Glembotsky AC, Laguens RP, Meckert PMC, Salim JP, Heller PG, Pozner RG, Marta RF, Molinas FC. Production of functional platelet-like particles by the megakaryoblastic DAMI cell line provides a model for platelet biogenesis. Platelets 2010; 22:28-38. [DOI: 10.3109/09537104.2010.515271] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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de Mast Q, de Groot PG, van Heerde WL, Roestenberg M, van Velzen JF, Verbruggen B, Roest M, McCall M, Nieman AE, Westendorp J, Syafruddin D, Fijnheer R, van Dongen-Lases EC, Sauerwein RW, van der Ven AJ. Thrombocytopenia in early malaria is associated with GP1b shedding in absence of systemic platelet activation and consumptive coagulopathy. Br J Haematol 2010; 151:495-503. [PMID: 20955404 DOI: 10.1111/j.1365-2141.2010.08399.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Thrombocytopenia develops early in malaria, but the underlying mechanisms remain incompletely understood. We studied the aetiology of malaria-associated thrombocytopenia in volunteers experimentally infected with Plasmodium falciparum malaria, in Indonesian malaria patients and in ex vivo studies. In experimental human malaria, the decrease in platelet counts was associated with a concurrent rise in young platelets (immature platelet fraction) and thrombopoietin. D-dimer concentrations were moderately elevated without a prolongation in the activated partial thromboplastin time or decrease in fibrinogen. There was no increase in expression of the platelet surface markers CD62P, PAC-1 and CD63 and in plasma concentrations of the platelet factors P-selectin, CXCR4, CXCL7, RANTES and CD40L. In contrast, concentrations of soluble glycoprotein-1b (sGP1b), the external domain of the platelet receptor for von Willebrand factor (VWF), increased early. Indonesian malaria patients also had elevated concentrations of sGP1b, which correlated with VWF concentrations. Finally, incubation of platelets with parasitized erythrocytes in vitro failed to induce platelet aggregation or activation. We concluded that neither compromised platelet production nor platelet activation or consumptive coagulopathy were responsible for the early thrombocytopenia in malaria. We hypothesize that the increase in sGP1b concentrations results from VWF-mediated GP1b shedding; a process that may prevent excessive adhesion of platelets and parasitized erythrocytes.
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Affiliation(s)
- Quirijn de Mast
- Department of General Internal Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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von Willebrand factor self-association on platelet GpIbalpha under hydrodynamic shear: effect on shear-induced platelet activation. Blood 2010; 116:3990-8. [PMID: 20696943 DOI: 10.1182/blood-2010-02-269266] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The function of the mechanosensitive, multimeric blood protein von Willebrand factor (VWF) is dependent on its size. We tested the hypothesis that VWF may self-associate on the platelet glycoprotein Ibα (GpIbα) receptor under hydrodynamic shear. Consistent with this proposition, whereas Alexa-488-conjugated VWF (VWF-488) bound platelets at modest levels, addition of unlabeled VWF enhanced the extent of VWF-488 binding. Recombinant VWF lacking the A1-domain was conjugated with Alexa-488 to produce ΔA1-488. Although ΔA1-488 alone did not bind platelets under shear, this protein bound GpIbα on addition of either purified plasma VWF or recombinant full-length VWF. The extent of self-association increased with applied shear stress more than ∼ 60 to 70 dyne/cm(2). ΔA1-488 bound platelets in the milieu of plasma. On application of fluid shear to whole blood, half of the activated platelets had ΔA1-488 bound, suggesting that VWF self-association may be necessary for cell activation. Shearing platelets with 6-μm beads bearing either immobilized VWF or anti-GpIbα mAb resulted in cell activation at shear stress down to 2 to 5 dyne/cm(2). Taken together, the data suggest that fluid shear in circulation can increase the effective size of VWF bound to platelet GpIbα via protein self-association. This can trigger mechanotransduction and cell activation by enhancing the drag force applied on the cell-surface receptor.
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Wang Z, Shi Q, Yan R, Liu G, Zhang W, Dai K. The role of calpain in the regulation of ADAM17-dependent GPIbalpha ectodomain shedding. Arch Biochem Biophys 2010; 495:136-43. [PMID: 20060803 DOI: 10.1016/j.abb.2010.01.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2009] [Revised: 01/04/2010] [Accepted: 01/05/2010] [Indexed: 01/23/2023]
Abstract
There are evidence that both a disintegrin and metalloproteinase 17 (ADAM17) and calpain are involved in platelet glycoprotein (GP)Ibalpha ectodomain cleavage. However, the relationship between the two enzymes in the shedding process remains unclear. Here we show that calcium ionophore A23187- and alpha-thrombin-induced GPIbalpha shedding is completely inhibited by the metalloproteinase inhibitor GM6001, whereas it is only partially inhibited by calpain inhibitors. Calpain activator dibucaine-induced GPIbalpha shedding was completely inhibited by both metalloproteinase and calpain inhibitors. On the other hand, calpain inhibitors did not inhibit GPIbalpha shedding induced by the reagents that specifically activate ADAM17. Furthermore, A23187-induced GPIbalpha shedding in Chinese hamster ovary cells expressing wild-type or mutant GPIb-IX was also partially inhibited by calpain inhibitors and almost completely inhibited by GM6001. Therefore, these data indicate that calpain plays an important role in the regulation of ADAM17-dependent GPIbalpha ectodomain shedding in both platelets and nucleated cells.
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Affiliation(s)
- Zhicheng Wang
- Beihang University, Haidian District, Beijing, China
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