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Recombinant factor VIII protein aggregation and adsorption at the liquid-solid interface. J Colloid Interface Sci 2022; 628:820-828. [DOI: 10.1016/j.jcis.2022.07.161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 06/07/2022] [Accepted: 07/26/2022] [Indexed: 11/22/2022]
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2
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AFM investigation of APAC (antiplatelet and anticoagulant heparin proteoglycan). Anal Bioanal Chem 2021; 414:1029-1038. [PMID: 34773471 PMCID: PMC8724117 DOI: 10.1007/s00216-021-03765-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 10/25/2021] [Accepted: 10/29/2021] [Indexed: 12/25/2022]
Abstract
Antiplatelet and anticoagulant drugs are classified antithrombotic agents with the purpose to reduce blood clot formation. For a successful treatment of many known complex cardiovascular diseases driven by platelet and/or coagulation activity, the need of more than one antithrombotic agent is inevitable. However, combining drugs with different mechanisms of action enhances risk of bleeding. Dual anticoagulant and antiplatelet (APAC), a novel semisynthetic antithrombotic molecule, provides both anticoagulant and antiplatelet properties in preclinical studies. APAC is entering clinical studies with this new exciting approach to manage cardiovascular diseases. For a better understanding of the biological function of APAC, comprehensive knowledge of its structure is essential. In this study, atomic force microscopy (AFM) was used to characterize APAC according to its structure and to investigate the molecular interaction of APAC with von Willebrand factor (VWF), since specific binding of APAC to VWF could reduce platelet accumulation at vascular injury sites. By the optimization of drop-casting experiments, we were able to determine the volume of an individual APAC molecule at around 600 nm3, and confirm that APAC forms multimers, especially dimers and trimers under the experimental conditions. By studying the drop-casting behavior of APAC and VWF individually, we depictured their interaction by using an indirect approach. Moreover, in vitro and in vivo conducted experiments in pigs supported the AFM results further. Finally, the successful adsorption of APAC to a flat gold surface was confirmed by using photothermal-induced resonance, whereby attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) served as a reference method.
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Mi X, Bromley EK, Joshi PU, Long F, Heldt CL. Virus Isoelectric Point Determination Using Single-Particle Chemical Force Microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:370-378. [PMID: 31845814 DOI: 10.1021/acs.langmuir.9b03070] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Virus colloidal behavior is governed by the interaction of the viral surface and the surrounding environment. One method to characterize the virus surface charge is the isoelectric point (pI). Traditional determination of virus pI has focused on the bulk characterization of a viral solution. However, virus capsids are extremely heterogeneous, and a single-particle method may give more information on the range of surface charge observed across a population. One method to measure the virus pI is chemical force microscopy (CFM). CFM is a single-particle technique that measures the adhesion force of a functionalized atomic force microscope (AFM) probe and, in this case, a virus covalently bound to a surface. Non-enveloped porcine parvovirus (PPV) and enveloped bovine viral diarrhea virus (BVDV) were used to demonstrate the use of CFM for viral particles with different surface properties. We have validated the CFM to determine the pI of PPV to be 4.8-5.1, which has a known pI value of 5.0 in the literature, and to predict the unknown pI of BVDV to be 4.3-4.5. Bulk measurements, ζ-potential, and aqueous two-phase system (ATPS) cross-partitioning methods were also used to validate the new CFM method for the virus pI. Most methods were in good agreement. CFM can detect the surface charge of viral capsids at a single-particle level and enable the comparison of surface charge between different types of viruses.
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Mohan Bangalore D, Tessmer I. Unique insight into protein-DNA interactions from single molecule atomic force microscopy. AIMS BIOPHYSICS 2018. [DOI: 10.3934/biophy.2018.3.194] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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5
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Bonazza K, Scheichl B, Frank J, Rottensteiner H, Schrenk G, Friedbacher G, Turecek PL, Scheiflinger F, Allmaier G. A bio-inspired method for direct measurement of local wall shear rates with micrometer localization using the multimeric protein von Willebrand factor as sensor molecule. BIOMICROFLUIDICS 2017; 11:044117. [PMID: 28936275 PMCID: PMC5577009 DOI: 10.1063/1.5000503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Accepted: 08/16/2017] [Indexed: 06/07/2023]
Abstract
Wall shear rates are critical for a broad variety of fluidic phenomena and are taken into account in nearly every experimental or simulation study. Generally, shear rates are not observable directly but rather derived from other parameters such as pressure and flow, often assuming somehow idealized systems. However, there is a biological system which is able to constantly measure the wall shear as a part of a regulatory circuit: The blood circulation system takes advantage of shear rate sensor (protein)molecules (multimeric forms of von Willebrand Factor, VWF), which are dissolved in the blood plasma and dramatically change their conformation under shear conditions. The conformational changes are accompanied by several functional variations and therefore interplay with the regulation of the coagulation system. In this study, we use a recombinantly produced and therefore well-defined multimeric form of VWF as a sensor which directly responds to shear rates. Shear rates, up to 32.000 s-1, were obtained using a kind of micro-plate-to-plate rheometer capable of adsorbing shear-stretched VWF oligomeric molecules on a surface to conserve their differently stretched conformation and so allow detection of their elongation by atomic force microscopy. The laminar flow in this geometrically simple device has been characterized by adopting classical fluid dynamical models, in order to ensure well-known, stable shear rates which could be correlated quantitatively with an observed stretching of sensor molecules.
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Affiliation(s)
- Klaus Bonazza
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | | | - Johannes Frank
- Joint Workshop of the Faculty of Technical Chemistry, Getreidemarkt 9, A-1060 Vienna, Austria
| | | | | | - Gernot Friedbacher
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | | | | | - Günter Allmaier
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
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6
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Spann AP, Campbell JE, Fitzgibbon SR, Rodriguez A, Cap AP, Blackbourne LH, Shaqfeh ESG. The Effect of Hematocrit on Platelet Adhesion: Experiments and Simulations. Biophys J 2017; 111:577-588. [PMID: 27508441 DOI: 10.1016/j.bpj.2016.06.024] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 05/28/2016] [Accepted: 06/08/2016] [Indexed: 01/05/2023] Open
Abstract
The volume fraction of red blood cells (RBCs) in a capillary affects the degree to which platelets are promoted to marginate to near a vessel wall and form blood clots. In this work we investigate the relationship between RBC hematocrit and platelet adhesion activity. We perform experiments flowing blood samples through a microfluidic channel coated with type 1 collagen and observe the rate at which platelets adhere to the wall. We compare these results with three-dimensional boundary integral simulations of a suspension of RBCs and platelets in a periodic channel where platelets can adhere to the wall. In both cases, we find that the rate of platelet adhesion varies greatly with the RBC hematocrit. We observe that the relative decrease in platelet activity as hematocrit falls shows a similar profile for simulation and experiment.
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Affiliation(s)
- Andrew P Spann
- Department of Chemical Engineering, University of Texas at Austin, Austin, Texas
| | | | - Sean R Fitzgibbon
- Department of Chemical Engineering, Stanford University, Stanford, California
| | - Armando Rodriguez
- United States Army Institute of Surgical Research, JBSA-Ft Sam Houston, Texas
| | - Andrew P Cap
- United States Army Institute of Surgical Research, JBSA-Ft Sam Houston, Texas
| | - Lorne H Blackbourne
- United States Army Institute of Surgical Research, JBSA-Ft Sam Houston, Texas
| | - Eric S G Shaqfeh
- Department of Chemical Engineering, Stanford University, Stanford, California; Department of Mechanical Engineering, Stanford University, Stanford, California; Institute for Computational & Mathematical Engineering, Stanford University, Stanford, California.
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7
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Xie Y, Wang J, Feng Y. Characterization of Recognition Events between Proteins on a Single Molecule Level with Atomic Force Microscopy. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.5b03922] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yang Xie
- Key
Laboratory of Biorheological Science and Technology, Ministry of Education
College of Bioengineering, Chongqing University, Chongqing, 400044, P. R. China
| | - Jianhua Wang
- Key
Laboratory of Biorheological Science and Technology, Ministry of Education
College of Bioengineering, Chongqing University, Chongqing, 400044, P. R. China
| | - Yonglai Feng
- Exposure and Biomonitoring
Division, Environmental Health Science and Research Bureau, Health
Canada, Ottawa, Ontario K1A 0K9, Canada
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8
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Bonazza K, Rottensteiner H, Schrenk G, Frank J, Allmaier G, Turecek PL, Scheiflinger F, Friedbacher G. Shear-Dependent Interactions of von Willebrand Factor with Factor VIII and Protease ADAMTS 13 Demonstrated at a Single Molecule Level by Atomic Force Microscopy. Anal Chem 2015; 87:10299-305. [PMID: 26369694 DOI: 10.1021/acs.analchem.5b02078] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Vital functions of mammals are only possible due to the behavior of blood to coagulate most efficiently in vessels with particularly high wall shear rates. This is caused by the functional changes of the von Willebrand Factor (VWF), which mediates coagulation of blood platelets (primary hemostasis) especially when it is stretched under shear stress. Our data show that shear stretching also affects other functions of VWF: Using a customized device to simulate shear conditions and to conserve the VWF molecules in their unstable, elongated conformation, we visualize at single molecule level by AFM that VWF is preferentially cleaved by the protease ADAMTS13 at higher shear rates. In contrast to this high shear-rate-selective behavior, VWF binds FVIII more effectively only below a critical shear rate of ∼30.000 s(-1), indicating that under harsh shear conditions FVIII is released from its carrier protein. This may be required to facilitate delivery of FVIII locally to promote secondary hemostasis.
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Affiliation(s)
- Klaus Bonazza
- Institute of Chemical Technologies and Analytics, Vienna University of Technology , Getreidemarkt 9/164, A-1060 Vienna, Austria
| | | | - Gerald Schrenk
- Baxalta Innovations, Industriestrasse 67, A-1221 Vienna, Austria
| | - Johannes Frank
- Central Machine Shop of the Faculty Technical Chemistry, Vienna University of Technology , Getreidemarkt 9/174, A-1060 Vienna, Austria
| | - Günter Allmaier
- Institute of Chemical Technologies and Analytics, Vienna University of Technology , Getreidemarkt 9/164, A-1060 Vienna, Austria
| | - Peter L Turecek
- Baxalta Innovations, Industriestrasse 67, A-1221 Vienna, Austria
| | | | - Gernot Friedbacher
- Institute of Chemical Technologies and Analytics, Vienna University of Technology , Getreidemarkt 9/164, A-1060 Vienna, Austria
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9
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Ca2+ concentration-dependent conformational change of FVIII B-domain observed by atomic force microscopy. Anal Bioanal Chem 2015; 407:6051-6. [DOI: 10.1007/s00216-015-8778-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 05/07/2015] [Accepted: 05/08/2015] [Indexed: 11/26/2022]
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Nashimoto Y, Takahashi Y, Ida H, Matsumae Y, Ino K, Shiku H, Matsue T. Nanoscale Imaging of an Unlabeled Secretory Protein in Living Cells Using Scanning Ion Conductance Microscopy. Anal Chem 2015; 87:2542-5. [DOI: 10.1021/ac5046388] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Yuji Nashimoto
- Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8576, Japan
| | - Yasufumi Takahashi
- Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8576, Japan
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8576, Japan
- PRESTO, JST, Kawaguchi, Saitama 332-0012, Japan
| | - Hiroki Ida
- Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8576, Japan
| | - Yoshiharu Matsumae
- Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8576, Japan
| | - Kosuke Ino
- Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8576, Japan
| | - Hitoshi Shiku
- Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8576, Japan
| | - Tomokazu Matsue
- Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8576, Japan
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8576, Japan
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Fitzgibbon S, Cowman J, Ricco AJ, Kenny D, Shaqfeh ESG. Examining platelet adhesion via Stokes flow simulations and microfluidic experiments. SOFT MATTER 2015; 11:355-367. [PMID: 25382632 DOI: 10.1039/c4sm01450b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
While critically important, the platelet function at the high shear rates typical of the microcirculation is relatively poorly understood. Using a large scale Stokes flow simulation, Zhao et al. recently showed that RBC-induced velocity fluctuations cause platelets to marginate into the RBC free near-wall region [Zhao et al., Physics of Fluids, 2012, 24, 011902]. We extend their work by investigating the dynamics of platelets in shear after margination. An overall platelet adhesion model is proposed in terms of a continuous time Markov process and the transition rates are established with numerical simulations involving platelet-wall adhesion. Hydrodynamic drag and Brownian forces are calculated with the boundary element method, while the RBC collisions are incorporated through an autoregressive process. Hookean springs with first order bond kinetics are used to model receptor-ligand bonds formed between the platelet and the wall. The simulations are compared with in vitro microfluidic experiments involving platelet adhesion to Von Willebrand Factor (VWF) coated surfaces.
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Affiliation(s)
- Sean Fitzgibbon
- Chemical Engineering, Stanford University, Stanford, CA, USA
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