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Wang T, Zheng Y, Wang X, Austin DE, Zhang Z. Sub-ppt Mass Spectrometric Detection of Therapeutic Drugs in Complex Biological Matrixes Using Polystyrene-Microsphere-Coated Paper Spray. Anal Chem 2017; 89:7988-7995. [DOI: 10.1021/acs.analchem.7b01296] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Teng Wang
- School
of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an 710065, China
| | - Yajun Zheng
- School
of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an 710065, China
| | - Xiaoting Wang
- School
of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an 710065, China
| | - Daniel E. Austin
- Department
of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Zhiping Zhang
- School
of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an 710065, China
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2
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Wang T, Zheng Y, Wang X, Wang Q, Ke C, Austin DE, Han X, Zhang Z. Abnormal adsorption and desorption behavior of pharmaceutical drugs on polystyrene microspheres. RSC Adv 2017. [DOI: 10.1039/c7ra01693j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report an abnormal adsorption and desorption behavior where a stronger adsorption interaction between polystyrene particles and pharmaceutical drugs results in preferable desorption behavior.
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Affiliation(s)
- Teng Wang
- School of Chemistry and Chemical Engineering
- Xi'an Shiyou University
- Xi'an 710065
- China
| | - Yajun Zheng
- School of Chemistry and Chemical Engineering
- Xi'an Shiyou University
- Xi'an 710065
- China
| | - Xiaoting Wang
- School of Chemistry and Chemical Engineering
- Xi'an Shiyou University
- Xi'an 710065
- China
| | - Qiang Wang
- School of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Congyu Ke
- School of Chemistry and Chemical Engineering
- Xi'an Shiyou University
- Xi'an 710065
- China
| | - Daniel E. Austin
- Department of Chemistry and Biochemistry
- Brigham Young University
- Utah 84602
- USA
| | - Xiaoxiao Han
- School of Chemistry and Chemical Engineering
- Xi'an Shiyou University
- Xi'an 710065
- China
| | - Zhiping Zhang
- School of Chemistry and Chemical Engineering
- Xi'an Shiyou University
- Xi'an 710065
- China
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Palacio MLB, Schricker SR, Bhushan B. Bioadhesion of various proteins on random, diblock and triblock copolymer surfaces and the effect of pH conditions. J R Soc Interface 2010; 8:630-40. [PMID: 21147831 DOI: 10.1098/rsif.2010.0557] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The adhesive interactions of block copolymers composed of poly(methyl methacrylate) (PMMA)/poly(acrylic acid) (PAA) and poly(methyl methacrylate)/poly(2-hydroxyethyl methacrylate) (PHEMA) with the proteins fibronectin, bovine serum albumin and collagen were studied by atomic force microscopy. Adhesion experiments were performed both at physiological pH and at a slightly more acidic condition (pH 6.2) to model polymer-protein interactions under inflammatory or infectious conditions. The PMMA/PAA block copolymers were found to be more sensitive to the buffer environment than PMMA/PHEMA owing to electrostatic interactions between the ionized acrylate groups and the proteins. It was found that random, diblock and triblock copolymers exhibit distinct adhesion profiles although their chemical compositions are identical. This implies that biomaterial nanomorphology can be used to control protein-polymer interactions and potentially cell adhesion.
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Affiliation(s)
- Manuel L B Palacio
- Nanoprobe Laboratory for Bio- and Nanotechnology and Biomimetics, The Ohio State University, Columbus, OH 43210, USA
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5
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Wang LC, Wu H, Chen XG, De Li L, Ji QX, Liu CS, Yu LJ, Ran C, Zhao QS. Biological evaluation of a novel chitosan-PVA-based local delivery system for treatment of periodontitis. J Biomed Mater Res A 2009; 91:1065-76. [DOI: 10.1002/jbm.a.32294] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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6
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Alfonsi-Hourdin S, Longchamp S, Gallet O, Nigretto JM. Electrochemical processing of fibrinogen modified-graphite surfaces: Effect on plasmin generation from adsorbed plasminogen. Biomaterials 2006; 27:52-60. [PMID: 16029886 DOI: 10.1016/j.biomaterials.2005.05.092] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2005] [Accepted: 05/27/2005] [Indexed: 11/26/2022]
Abstract
With the aim to improve the fibrinolytic properties of carbons by different biological and electrochemical treatments, we modified graphite surfaces by fibrinogen adsorption and subsequent application of various constant potentials before submitting them to plasminogen adsorption. First, we verified that plasminogen (purified or present in human plasma) could adsorb onto these modified surfaces and that adsorbed plasminogen could be converted by t-PA (the principal physiological activator of plasminogen) to adsorbed plasmin. The catalytic properties of the generated enzyme were characterized in assay solutions containing t-PA, fibrinogen and the chromogenic substrate S-2403 (pyroGlu-Phe-Lys-p-nitroaniline, HCl). Experiments showed that the application of electrical potentials to the fibrinogen coating could indirectly affect the properties of the material. In the case of anodic potentials, the amidolytic activity of the generated plasmin was significantly enhanced. Especially, this activity was 10 times higher at a particular potential value.
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Yoshinari M, Hayakawa T, Matsuzaka K, Inoue T, Oda Y, Shimono M, Ide T, Tanaka T. Oxygen plasma surface modification enhances immobilization of simvastatin acid. Biomed Res 2006; 27:29-36. [PMID: 16543663 DOI: 10.2220/biomedres.27.29] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Simvastatin acid (SVA) has been reported to stimulate bone formation with increased expression of BMP-2. Therefore, immobilization of SVA onto dental implants is expected to promote osteogenesis at the bone tissue/implant interface. The aim of this study was to evaluate the immobilization behavior of SVA onto titanium (Ti), O(2)-plasma treated titanium (Ti + O(2)), thin-film coatings of hexamethyldisiloxane (HMDSO), and O(2)-plasma treated HMDSO (HMDSO + O(2)) by using the quartz crystal microbalance-dissipation (QCM-D) technique. HMDSO surfaces were activated by the introduction of an OH group and/or O(2)-functional groups by O(2)-plasma treatment. In contrast, titanium surfaces showed no appreciable compositional changes by O(2)-plasma treatment. The QCM-D technique enabled evaluation even at the adsorption behavior of a substance with a low molecular weight such as simvastatin. The largest amount of SVA was adsorbed on O(2)-plasma treated HMDSO surfaces compared to untreated titanium, HMDSO-coated titanium, and O(2)-plasma treated titanium. These findings suggested that the adsorption of SVA was enhanced on more hydrophilic surfaces concomitant with the presence of an OH group and/or O(2)-functional group resulting from the O(2)-plasma treatment, and that an organic film of HMDSO followed by O(2)-plasma treatment is a promising method for the adsorption of SVA in dental implant systems.
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Affiliation(s)
- Masao Yoshinari
- Department of Dental Materials Science, Oral Health Science Center, Tokyo Dental College, 1-2-2 Masago, Mihama-ku, Chiba 261-8502, Japan.
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8
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Göppert TM, Müller RH. Adsorption kinetics of plasma proteins on solid lipid nanoparticles for drug targeting. Int J Pharm 2005; 302:172-86. [PMID: 16098695 DOI: 10.1016/j.ijpharm.2005.06.025] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2004] [Revised: 06/06/2005] [Accepted: 06/14/2005] [Indexed: 11/22/2022]
Abstract
The interactions of intravenously injected carriers with plasma proteins are the determining factor for the in vivo fate of the particles. In this study the adsorption kinetics on solid lipid nanoparticles (SLN) were investigated and compared to the adsorption kinetics on previously analyzed polymeric model particles and O/W-emulsions. The adsorbed proteins were determined using two-dimensional polyacrylamide gel electrophoresis (2-DE). Employing diluted human plasma, a transient adsorption of fibrinogen was observed on the surface of SLN stabilized with the surfactant Tego Care 450, which in plasma of higher concentrations was displaced by apolipoproteins. This was in agreement with the "Vroman-effect" previously determined on solid surfaces. It says that in the early stages of adsorption, more plentiful proteins with low affinity are displaced by less plentiful with higher affinity to the surface. Over a period of time (0.5 min to 4 h) more interesting for the organ distribution of long circulating carriers, no relevant changes in the composition of the adsorption patterns of SLN, surface-modified with poloxamine 908 and poloxamer 407, respectively, were detected. This is in contrast to the chemically similar surface-modified polymeric particles but well in agreement with the surface-modified O/W-emulsions. As there is no competitive displacement of apolipoproteins on these modified SLN, the stable adsorption patterns may be better exploited for drug targeting than particles with an adsorption pattern being very dependent on contact time with plasma.
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Affiliation(s)
- T M Göppert
- The Free University of Berlin, Institute of Pharmacy, Department of Pharmaceutical Technology, Biotechnology and Quality Management, Kelchstr. 31, 12169 Berlin, Germany
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9
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Mauck CK, Weiner DH, Ballagh SA, Creinin MD, Archer DF, Schwartz JL, Pymar HC, Lai JJ, Rencher WF, Callahan MM. Single and multiple exposure tolerance study of polystyrene sulfonate gel: a phase I safety and colposcopy study. Contraception 2005; 70:77-83. [PMID: 15208057 PMCID: PMC2861169 DOI: 10.1016/j.contraception.2004.02.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2003] [Revised: 02/01/2004] [Accepted: 02/12/2004] [Indexed: 11/24/2022]
Abstract
OBJECTIVES To evaluate symptoms and signs of genital irritation, vaginal leakage and acceptability of polystyrene sulfonate (PSS), which is being studied as a vaginal contraceptive and microbicide. METHODS Forty-nine women applied 2.5 mL of either 5% PSS, 10% PSS, PSS vehicle, or Conceptrol (a marketed spermicidal product containing 4% nonoxynol-9) for 6 consecutive days. RESULTS All women completed the study except one in the Conceptrol group who experienced vaginal symptoms after her first use and was discontinued. After both the first use and after all uses, irritation was seen among more women in the Conceptrol group than in the PSS groups, reaching statistical significance with regard to any evidence of irritation, signs of irritation and product-related irritation. There were no adverse events that were serious, unexpected and related to product use in any group. The 5% concentration of PSS may be preferable in terms of leakage and acceptability. CONCLUSION The results suggest that PSS has a safety profile comparable to that of the marketed nonoxynol-9 product, Conceptrol, and appears to be associated with less genital irritation.
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Affiliation(s)
- Christine K Mauck
- CONRAD, Eastern Virginia Medical School, 1611 North Kent Street, Suite 806, Arlington 22209, USA.
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Yu Y, Jin G. Study of the adsorption of fibrinogen on gold-coated silicon wafer by an impedance method. J Colloid Interface Sci 2003; 268:288-92. [PMID: 14643229 DOI: 10.1016/j.jcis.2003.08.047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In 0.1 mol/l KH(2)PO(4)-Na(2)HPO(4) (pH 7.80) buffer solution, the potential of zero charge (PZC) and the open circuit potential of gold-coated silicon were determined to be about -0.6 and +0.10 V (vs SCE), respectively. The open circuit potential was higher than the PZC, which indicated that the surface of the gold-coated electrode had a positive charge. The ellipsometry experiment showed that the adsorption of fibrinogen onto the gold-coated silicon wafer surface arrived at a saturated state when the adsorption time exceeded 50 min. The percentage of surface without adsorbed protein, theta, was about 63%. This means that the proportion of surface actually occupied by fibrinogen was only about 37% after the adsorption arrived at saturation. The solution/protein capacitance value was determined in an impulse state around -0.59 V (vs SCE) and was stable (4.2x10(-5) F) at other potentials.
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Affiliation(s)
- Yong Yu
- Laboratory of National Microgravity, Institute of Mechanics, Chinese Academy of Science, 100080, Beijing, People's Republic of China
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11
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Wetterö J, Bengtsson T, Tengvall P. C1q-independent activation of neutrophils by immunoglobulin M-coated surfaces. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2001; 57:550-8. [PMID: 11553885 DOI: 10.1002/1097-4636(20011215)57:4<550::aid-jbm1201>3.0.co;2-t] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Neutrophil granulocytes are known to rapidly adhere and undergo frustrated phagocytosis upon contact with immunoglobulin and/or complement protein opsonized artificial surfaces. In this study, we examined the relation between serum protein deposition and human neutrophil activation on hydrophobic glass and silicon model surfaces that were coated with immunoglobulin G or M (IgG/IgM), both initiators of the classical complement pathway. Protein adsorption from normal human serum (NHS) was quantified with null-ellipsometry combined with antibody techniques. The neutrophil oxygen radical production was registered by luminol-amplified chemiluminescence (CL) and the morphology, as well as changes in the content of filamentous actin (F-actin), were documented by fluorescence microscopy. Complement factor 3 (C3) bound to both IgG- and IgM-coated surfaces, but surprisingly C1q was found only on IgG-coated surfaces. Both immunoglobulins triggered complement dependent neutrophil activation. However, CL and F-actin accumulation were found sensitive to the presence of C1q in the serum only at the IgG-coated surface. We suggest that spontaneously adsorbed IgM activates the complement system and interacts with neutrophils by C1q-independent mechanisms.
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Affiliation(s)
- J Wetterö
- Laboratory of Applied Physics, Department of Physics and Measurement Technology, Linköping University, SE-581 83 Linköping, Sweden.
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12
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Song D, Forciniti D. Effects of Cosolvents and pH on Protein Adsorption on Polystyrene Latex: A Dynamic Light Scattering Study. J Colloid Interface Sci 2000; 221:25-37. [PMID: 10623449 DOI: 10.1006/jcis.1999.6560] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Dynamic light scattering was used to study the adsorption of two proteins with different surface properties (IgG and HSA) on negatively charged polystyrene latex. The proteins were adsorbed from water and from water/methanol and water/glycerol mixtures at various pH. Some striking differences between the adsorption behaviors of the proteins were observed. Whereas the thickness of the adsorbed layer of HSA was extremely sensitive to pH and solvent composition, that of IgG was not. IgG mainly showed an end-on orientation on polystyrene whereas several different surface orientations are suggested for HSA under different conditions. The addition of methanol inhibited the adsorption of HSA on the latex, but it did not affect the adsorption of IgG. In contrast, the addition of glycerol increased the thickness of the adsorbed layers of both proteins. So, the orientation of IgG on the latex is insensitive to pH but is a function of the kind of solvent whereas both pH and solvent strongly affect the adsorption of HSA. This is a puzzling result since both cosolvents should equally affect the adsorption of both proteins if the dominant forces for adsorption are the same. Therefore, we concluded that, whereas hydrophobic interactions are the dominant force in the adsorption behavior of HSA, van der Waals forces are the main forces involved in the attachment of IgG to the lattices. Copyright 2000 Academic Press.
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Affiliation(s)
- D Song
- Department of Chemical Engineering, University of Missouri-Rolla, Rolla, Missouri, 65401
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13
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Sun X, Sheardown H, Tengvall P, Brash JL. Peptide modified gold-coated polyurethanes as thrombin scavenging surfaces. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 49:66-78. [PMID: 10559748 DOI: 10.1002/(sici)1097-4636(200001)49:1<66::aid-jbm9>3.0.co;2-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Thin layers of gold were deposited on polyurethane film and chemisorbed with three peptides having an N-terminal cysteine: Cys-Pro-Arg, Cys-(L)Phe-Pro-Arg, and Cys-(D)Phe-Pro-Arg. The ability of these surfaces to act as thrombin scavengers was evaluated. The peptides are related to the known thrombin inhibitor Phe-Pro-Arg chloromethyl ketone and were shown to have significant thrombin inhibitory activity in solution. Attachment of the peptides to gold was confirmed by water contact angle and X-ray photoelectron spectroscopy measurements. Thrombin adsorption from a buffer and plasma was investigated, and chromogenic substrate assays were carried out for thrombin activity on the surfaces and in the supernatant following adsorption. The data suggest that the peptide-modified surfaces are able to adsorb thrombin with high affinity from a buffer and that thrombin is taken up selectively from plasma. The Cys-(D)Phe-Pro-Arg modified surfaces showed particularly high affinity for thrombin. It was also found that the activity of thrombin adsorbed on the peptide surfaces was inhibited, and inhibition was greatest on the Cys-(D)Phe-Pro-Arg surface. We concluded that the peptide surfaces may have potential as antithrombogenic materials via their ability to scavenge and inhibit thrombin generated as a result of blood-material contact.
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Affiliation(s)
- X Sun
- Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada
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Lee JH, Lee HB. Platelet adhesion onto wettability gradient surfaces in the absence and presence of plasma proteins. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1998; 41:304-11. [PMID: 9638536 DOI: 10.1002/(sici)1097-4636(199808)41:2<304::aid-jbm16>3.0.co;2-k] [Citation(s) in RCA: 139] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A wettability gradient was prepared on lowdensity polyethylene (PE) sheets by treating them in air with a corona from a knife-type electrode the power of which increased gradually along the sample length. The PE surfaces oxidized gradually with the increasing corona power and a wettability gradient was created on the surfaces, as evidenced by the measurement of water contact angles, Fourier transform infrared spectroscopy in the attenuated total reflectance mode, and electron spectroscopy for chemical analysis. The wettability gradient surfaces prepared were used to investigate the adhesion behavior of platelets in the absence and presence of plasma proteins in terms of the surface hydrophilicity/hydrophobicity of polymeric materials. The platelets adhered to the wettability gradient surfaces along the sample length were counted and examined by scanning electron microscopy (SEM). It was observed that the platelet adhesion in the absence of plasma proteins increased gradually as the surface wettability increased along the sample length. The platelets adhered to the hydrophilic positions of the gradient surface also were more activated (possessed more pseudo pods as examined by SEM) than on the more hydrophobic ones. However, platelet adhesion in the presence of plasma proteins decreased gradually with the increasing surface wettability; the platelets adhered to the surface also were more activated on the hydrophobic positions of the gradient surface. This result is closely related to plasma protein adsorption on the surface. Plasma protein adsorption on the wettability gradient surface increased with the increasing surface wettability. More plasma protein adsorption on the hydrophilic positions of the gradient surface caused less platelet adhesion, probably due to platelet adhesion inhibiting proteins, such as high-molecular-weight kininogen, which preferably adsorbs onto the surface by the so-called Vroman effect. It seems that both the presence of plasma proteins and surface wettability play important roles for platelet adhesion and activation.
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Affiliation(s)
- J H Lee
- Department of Macromolecular Science, Hannam University, Daedeog Ku, Taejon, Korea
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Fowers K, Kopeček J. Development of a fibrinolytic surface: specific and non-specific binding of plasminogen. Colloids Surf B Biointerfaces 1997. [DOI: 10.1016/s0927-7765(97)00034-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kishore R, Samuel M, Khan MY, Hand J, Frenz DA, Newman SA. Interaction of the NH2-terminal domain of fibronectin with heparin. Role of the omega-loops of the type I modules. J Biol Chem 1997; 272:17078-85. [PMID: 9202024 DOI: 10.1074/jbc.272.27.17078] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Determinants of the interaction of the 29-kDa NH2-terminal domain of fibronectin with heparin were explored by analysis of normal and mutant recombinant NH2-terminal fibronectin fragments produced in an insect cell Baculovirus host vector system. A genomic/cDNA clone was constructed that specified a secretable human fibronectin NH2 fragment. With the use of site-directed mutagenesis a set of 29 kDa fragments was obtained that contained glycine or glutamic acid residues in place of basic residues at various candidate sites for heparin binding in the five type I modules that make up the domain. The recombinant fragment containing the wild type sequence had a nearly normal circular dichroic spectra and a melting profile, as assayed by loss of ellipticity at 228 nm, that was indistinguishable from that of the native fragment obtained by trypsinization of plasma fibronectin. A substantial proportion of the wild type recombinant fragment bound to heparin-Sepharose, where it was eluted at the same NaCl concentration as the native fragment. The wild type fragment was capable of promoting matrix-driven translocation, a morphogenetic effect in artificial extracellular matrices that depends on the interaction of the fibronectin NH2 terminus with heparin-like molecules on the surfaces of particles. Mutant fragments in which arginines predicted to be most exposed in the folded fragment were converted to glycines retained the same affinity for heparin as the wild type fragment. In contrast, a mutant fragment in which the single basic residue (Arg99) in the minor loop ("Omega-loop") of the second type I module was converted to a glycine had an essentially normal melting profile but exhibited no binding to heparin and failed to promote matrix-driven translocation. A mutant fragment in which the single basic residue (Arg52) of the first type I module was converted to a glycine also completely lacked heparin binding activity, but one in which the single basic residue (Arg191) the fourth type I module was converted to a glycine retained the ability to bind heparin. A mutant fragment in which the single basic residue (Lys143) in the Omega-loop of the third type I module was converted to a glutamic acid lacked heparin binding activity but had a CD spectrum similar to the heparin-liganded native protein and was capable of promoting matrix-driven translocation. The results indicate that multiple residues in the Omega-loops of the fibronectin NH2-terminal domain participate in its interactions with heparin. In addition, the conformation of one of the nonbinding mutants may mimic the heparin-induced structural alteration in this fibronectin domain required for certain morphogenetic events.
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Affiliation(s)
- R Kishore
- Department of Cell Biology and Anatomy, New York Medical College, Valhalla, New York 10595, USA
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18
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Buettner JA, Dadd CA, Baumbach GA, Masecar BL, Hammond DJ. Chemically derived peptide libraries: a new resin and methodology for lead identification. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1996; 47:70-83. [PMID: 8907502 DOI: 10.1111/j.1399-3011.1996.tb00812.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We have developed a new resin for peptide synthesis that can be used to synthesize and evaluate directly combinatorial peptide libraries for binding target proteins. Fidelity of the peptide synthesis using this hydrophilic resin is comparable to polystyrene-based resins. Peptide libraries synthesized on this resin were probed by a two color PEptide Library Immunostaining Chromatographic ANalysis (PELICAN) technique for sequences binding the serine protease Factor IX zymogen. This PELICAN technique readily distinguishes between beads interacting with the reagents for target detection (blue beads) from those beads specific for the target protein itself (red beads). Validation of the PELICAN technique, as well as purification of Factor IX from plasma, is demonstrated utilizing this resin.
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Dahri L, Boisson-Vidal C, Regnault V, Muller D, Sultan Y, Stolz JF. Synthetic sorbents for removal of factor VIII inhibitors from haemophilic A plasma. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL APPLICATIONS 1995; 664:47-54. [PMID: 7757240 DOI: 10.1016/0378-4347(94)00350-e] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Human factor VIII (FVIII) is a protein of the blood coagulation system that is absent or defective in patients with haemophilia A. A most serious complication following replacement therapy in 10-15% of patients treated with available FVIII concentrate is the development of inhibitors of FVIII (anti-FVIII). Some polymers functionalized with suitable chemical substituents which mimic part of the epitope of FVIII recognized by the inhibitors might be used in extracorporeal circulation to reduce the concentration of antibodies to FVIII. For this purpose, insoluble polystyrene bearing sulfonate and L-tyrosine methyl ester sulfamide groups have been synthesized. The in vitro removal of anti-FVIII inhibitors from plasmas of patients with haemophilia A was performed. Different chromatographic parameters were studied and optimized.
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Affiliation(s)
- L Dahri
- Laboratoire d'Hémorhéologie-Hématologie, Faculté de Médecine, Vandoeuvre lès Nancy, France
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20
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Yen HR, Oscarsson S, Ulbrich K, Kopecek J. Adsorption and activation of zymogens at solid-liquid interfaces. I. Chymotrypsinogen on alkylamino modified silica derivatives. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1994; 28:247-57. [PMID: 8207038 DOI: 10.1002/jbm.820280216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Silica beads were modified with alkylamino groups of different lengths (C2, C4, C6, C8, and C10) and hydrophobicity. The relationship between surface structure and adsorption of chymotrypsinogen followed by its activation with trypsin at the solid-liquid interface was studied. From the adsorption isotherms, it follows that underivatized silica adsorbed chymotrypsinogen (CTG) well. The adsorption of CTG on alkylamino modified silicas appeared to correlate with the hydrophobicity of the latter. The longer the alkyl chains were, the higher was the amount of adsorbed CTG. The activation of adsorbed CTG with trypsin at the solid-liquid interface was a slower process when compared with the activation conducted in solution. Parallel experiments were performed with chymotrypsin (CT). The adsorption behavior was similar to that of CTG. The activity of adsorbed CT was inversely proportional to the hydrophobicity of the beads. These results correlated well with the desorption of CT after repeated washings. Repeated addition of substrate (Gly-Gly-Phe-NAp) to the CT covered beads resulted in the CT desorption. The higher the hydrophobicity of the beads was, the lower was the desorption of CT.
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Affiliation(s)
- H R Yen
- Department of Bioengineering, University of Utah, Salt Lake City 84112
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21
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Paulsson M, Kober M, Freij-Larsson C, Stollenwerk M, Wesslén B, Ljungh A. Adhesion of staphylococci to chemically modified and native polymers, and the influence of preadsorbed fibronectin, vitronectin and fibrinogen. Biomaterials 1993; 14:845-53. [PMID: 7692991 DOI: 10.1016/0142-9612(93)90006-n] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A commercially available poly(ether urethane), polyethylene, and modifications of these polymers have been compared with respect to adsorption of fibronectin, fibrinogen and vitronectin. The adhesion of staphylococcal strains (characterized for ability to bind immobilized proteins, cell surface hydrophobicity and charge) was studied by bioluminescence with and without preadsorption of proteins to the surfaces. The least amount of proteins and the fewest bacteria adhered to the amphiphilic surfaces. When polymers were preincubated with plasma or albumin, lower numbers of bacteria adhered, except to Pellethane grafted with PEG 20,000, to which coagulase-negative staphylococci adhered to a higher extent.
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Affiliation(s)
- M Paulsson
- Department of Medical Microbiology, University of Lund, Sweden
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22
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Boisson-Vidal C, Jozefonvicz J, Brash JL. Interaction of antithrombin III in purified solution and in plasma with insoluble modified polystyrene. Colloids Surf B Biointerfaces 1993. [DOI: 10.1016/0927-7765(93)80049-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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23
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Verrecchia T, Huve P, Bazile D, Veillard M, Spenlehauer G, Couvreur P. Adsorption/desorption of human serum albumin at the surface of poly(lactic acid) nanoparticles prepared by a solvent evaporation process. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1993; 27:1019-28. [PMID: 8408114 DOI: 10.1002/jbm.820270807] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Biocompatible and biodegradable nanoparticles of poly(lactic acid) (100% L-lactic units = PLA) were prepared by an emulsion, microfluidization, and solvent evaporation method using human serum albumin (HSA) as a surface agent. A radiolabeling technique was employed to quantify the serum albumin bound to the nanoparticles and to measure its desorption kinetics in various media at 22 degrees C and 37 degrees C (phosphate buffer pH 7.4, serum albumin 40 g/L in phosphate buffer pH 7.4 and fetal calf serum). The amount of serum albumin bound to the nanoparticles was found to be a linear function of 1/D (where D is the nanoparticle mean diameter) and was related to the total developed area of the nanoparticles. The adsorption/desorption behavior of serum albumin at the surface of the nanoparticles suggested a multilayer adsorption model. Moreover, a part of the serum albumin molecules was irreversibly bound regardless of the incubation conditions. Consequently, the classical Langmuirian theories of equilibria could not be applied.
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Affiliation(s)
- T Verrecchia
- Rhone-Poulenc Rorer, IBP-PHTEC, New Drug Delivery System Unit, Antony, France
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24
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Cliquet F, Cuillière ML, Montagne P, Duheille J. Interactions of complement fraction C1q, fibronectin, and immunoglobulin G with polyacrylic microparticles used as solid-phase in immunoassay. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1993; 27:587-97. [PMID: 8314811 DOI: 10.1002/jbm.820270505] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A microparticle-enhanced nephelometric immunoassay was recently described, where polyacrylic, hydrophilic, and polyfunctional microparticles are used as the solid phase. It is a one-step immunoassay based on the nephelometric quantification of microparticle agglutination. In such assays, the measurement of analytes at low concentration may be impaired by the need of using undiluted biological samples. This leads to work with high concentrations of several proteins liable to interfere with the agglutination process. In this paper, we report on a study performed with human serum and purified proteins, which were assayed by classical analytical methods. This work identified three major components of human serum specifically involved in yielding polyacrylic microparticle instability: complement fraction C1q, fibronectin, and immunoglobulins G. In this order of importance, they all showed a marked ability to be adsorbed on the microparticle's surface. Pretreatment of human serum with microparticles decreased the concentrations in C1q (82%), fibronectin (16%), and immunoglobulin G (4%) very unequally. However, it allowed the elimination of microparticle instability, consequently providing the possible use of such polyacrylic microparticles in a one-step nephelometric immunoassay of analytes at low concentration in biological samples, without washes or phase separation.
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Affiliation(s)
- F Cliquet
- Immunology Laboratory, Faculty of Medicine, Vandoeuvre les Nancy, France
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25
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Cohn D, Elchai Z, Gershon B, Karck M, Lazarovici G, Sela J, Chandra M, Marom G, Uretzky G. Introducing a selectively biodegradable filament wound arterial prosthesis: a short-term implantation study. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1992; 26:1184-204. [PMID: 1429766 DOI: 10.1002/jbm.820260909] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
This article introduces a new compliant and selectively biodegradable filament wound vascular graft and reports the findings of a short-term implantation study. A basic feature of filament winding is its ability to tailor and better control the mechanical properties of the prosthesis, so that a closer match with the anisotropic properties of native arteries is achieved. The elastomeric vascular grafts comprise poly(ether urethane urea) fibers (Lycra) embedded in a two-component matrix consisting of poly(ether urethane) (Pellethane) and a highly flexible poly(ethylene glycol)/poly(lactic acid) biodegradable segmented copolymer (PELA). Typical tensile modulus values fall in the few megapascals (MPa) range, this being comparable to that of natural arteries. The wound graft exhibits excellent handling and suturability characteristics as well as enhanced burst strength. Furthermore, due to its biodegradable constituent, the prosthesis combines minimal intraoperative blood loss and high healing porosity. The graft displays initially negligible in vitro water permeation, which increases gradually with time. In this short-term study, the prostheses were implanted in the canine carotid, and their biological performance was compared to that of expanded Gore-Tex. The luminal surface of the wound grafts was coated with a thin layer of pseudointima, strongly adhered to the prosthesis surface. Contrasting with the very stiff Gore-Tex grafts, the filament wound prostheses retained their high compliance, being highly pulsatile upon explanation. Histological studies fully corroborated these findings, underscoring the healing properties of these new filament wound vascular prostheses.
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Affiliation(s)
- D Cohn
- Casali Institute of Applied Chemistry, Graduate School of Applied Science and Technology, Hebrew University of Jerusalem, Israel
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26
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Woodhouse KA, Brash JL. Adsorption of plasminogen from plasma to lysine-derivatized polyurethane surfaces. Biomaterials 1992; 13:1103-8. [PMID: 1493194 DOI: 10.1016/0142-9612(92)90143-c] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The adsorption of plasminogen, the principal protein of the fibrinolytic pathway in blood, to a number of solid surfaces from plasma was investigated. This study forms part of a larger project to develop a fibrinolytic surface for blood-contacting applications. Polyurethanes incorporating lysine residues were developed in an attempt to promote selective adsorption of plasminogen from plasma through lysine-binding sites in the plasminogen molecule. The adsorption of plasminogen to these surfaces as well as to glass, 'conventional' polyurethanes and precursor sulphonated polyurethanes was investigated. Adsorption from citrated human plasma diluted with isotonic Tris buffer (pH 7.4) was measured under static conditions at room temperature using radioiodinated plasminogen. The following trends were observed. (1) Adsorption increases monotonically with increasing plasma concentration and there is no suggestion of transient adsorption (Vroman effect) on any of the surfaces studied. (2) Sulphonate groups appear to have a strong effect on plasminogen adsorption as was found previously for adsorption from buffer. (3) The lysine-derivatized material having the highest lysine content may show a slight increase in plasminogen binding affinity compared to its sulphonated precursor.
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Affiliation(s)
- K A Woodhouse
- Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada
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