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Sierksma, A. (author), van der Gaag, M.S. (author), Kluft, C. (author), Hendriks, H.F.J. (author), TNO Voeding (author)In a diet-controlled, crossover trial with 10 middle-aged men and 9 postmenopausal women, baseline concentrations of fibrinogen influenced the magnitude of decrease of fibrinogen after moderate alcohol consumption. The mechanism of reduction is specific for fibrinogen and unrelated to a reduction in C-reactive protein.conference paper 2001
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van der Schans, G.P. (author), Noort, D. (author), Mars-Groenendijk, R.H. (author), van Dijk-Knijnenburg, H.C.M. (author), Fidder, A. (author), de Jong, L.P.A. (author), Benschop, H.P. (author)We have developed two modes of a standard operating procedure (SOP) for immunochemical detection of sulfur mustard adducts to DNA in human blood and skin. In the shortened mode data could be generated within 9 h after in vitro exposure of human blood to > 1 μM sulfur mustard. The sensitive mode allows detection of exposure to 50 nM sulfur...conference paper 2000
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van der Schans, G.P. (author), Haring, R. (author), van Dijk- Knijnenburg, H.C.M. (author), Bruijnzeel, P.L.B. (author), den Daas, N.H.G. (author)An immunochemical assay has been developed to detect oxidative damage in bovine sperm DNA. Sperm DNA contains a large amount of oxidative damage as a result of exposure to exogenous agents, but damage also can caused by normal metabolic processes and the absence of DNA repair in the later stages of spermatogenesis. A freeze-thaw procedure...article 2000
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TNO Preventie en Gezondheid (author), Meijers, J.C.M. (author), Oudijk, E.J.D. (author), Mosnier, L.O. (author), Bos, R. (author), Bouma, B.N. (author), Nieuwenhuis, H.K. (author), Fijnheer, R. (author)Acute promyelocytic leukaemia (APL) is a disease that is distinguished from other leukaemias by the high potential for early haemorrhagic death. Several processes are involved, such as disseminated intravascular coagulation and hyperfibrinolysis. Recently, TAFI (thrombin-activatable fibrinolysis inhibitor) was identified as a link between...article 2000
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Rosén, S. (author), Wejkum, L. (author), Billing-Claeson, S. (author), Ghosh, R. (author), Grdic, K. (author), Chmielewska, J. (author), Meijer, P. (author), Kluft, C. (author), Tengborn, L. (author), Conkie, J. (author), Walker, I. (author), Gaubius Instituut TNO (author)A chromogenic bioimmunoassay method for determination of t-PA activities has been evaluated on plasmas from healthy individuals and from thromboembolic patients. The assay consists of an initial binding and washing step, whereby plasma t-PA is bound to a specific monoclonal t-PA antibody, which is coated on to microplate wells, followed by a...article 1998
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Hanemaaijer, R. (author), Visser, H. (author), Konttinen, Y.T. (author), Koolwijk, P. (author), Verheijen, J.H. (author), Gaubius Instituut TNO (author)Here we describe a new principle for accessing the activity of the different members of the human matrix-metalloproteinases (MMPs) by a colorimetric assay. Using protein engineering, a modified pro-urokinase was made in which the activation sequence, normally recognized by plasmin (ProArgPheLys ↓ IlelleGlyGly), was replaced by a sequence that is...article 1998
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Elliott, C.T. (author), Baxter, G.A. (author), Hewitt, S.A. (author), Arts, C.J.M. (author), van Baak, M. (author), Hellenäs, K.-E. (author), Johannson, A. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)The drug salbutamol (SBL) is a β-agonist that may be used illegally as an animal growth promoter. SBL is also a good example of a drug which is excreted in the form of glucuronides and sulfates. Such metabolites cause complexities in analysing for the presence of drug residues. In the majority of cases a process of deconjugation and sample clean...article 1998
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van Oosthuyze, K.E.I. (author), Arts, C.J.M. (author), van Peteghem, C.H. (author), Instituut CIVO-Toxicologie en Voeding TNO (author)A rapid screening method for β-agonists in cattle urine was developed that offers speed and protocol simplicity and that could be performed on the spot. The method consists of an extraction on Empore membranes with strong cation exchange properties and a test strip immunoassay. The Empore extraction provides a fast and simple cleanup of the...article 1997
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Bos, R. (author), van Leuven, C.J.M. (author), Stolk, J. (author), Hiemstra, P.S. (author), Ronday, H.K. (author), Nieuwenhuizen, W. (author), TNO Preventie en Gezondheid (author)Upon stimulation, polymorphonuclear leucocytes (PMNs) release potent serine proteases, i.e. elastase, cathepsin C and proteinase 3, which contribute to the degradation of tissue and plasma components. Here, we describe the development of a plasma test to assess PMN-mediated fibrinogenolysis as a biochemical marker for actual PMN-derived...article 1997
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Haverkate, F. (author), Thompson, S.G. (author), Pyke, S.D.M. (author), Gallimore, J.R. (author), Pepys, M.B. (author), TNO Preventie en Gezondheid (author)Background. Inflammation is an important feature of atherosclerotic lesions, and increased production of the acute-phase reactant, C-reactive protein (CRP), is associated with a poor prognosis in severe unstable angina. We have investigated the existence and possible significance of the acute-phase responses of CRP and another sensitive reactant...article 1997
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Kockx, M. (author), de Maat, M.P.M. (author), Knipscheer, H.C. (author), Kastelein, J.P. (author), Kluft, C. (author), Princen, H.M.G. (author), Kooistra, T. (author), Gaubius Instituut TNO (author)Evaluation of fibrate treatment in humans has focused primarily on its anti-lipidaemic effects. A potentially favourable haemostasis-modulating activity of fibrates has also been recognized but the data are not consistent. We sought to learn more about this variability by examining the effects of gemfibrozil and ciprofibrate on plasma levels of...article 1997
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Mestecky, J. (author), Hamilton, R.G. (author), Magnusson, C.G.M. (author), Jefferis, R. (author), Vaerman, J.P. (author), Goodall, M. (author), de Lange, G.G. (author), Moro, I. (author), Aucouturier, P. (author), Radl, J. (author), Cambiaso, C. (author), Silvain, C. (author), Preud'homme, J.L. (author), Kusama, K. (author), Carlone, G.M. (author), Biewenga, J. (author), Kobayashi, K. (author), Skvaril, F. (author), Reimer, C.B. (author), Gaubius Instituut TNO (author)51 monoclonal antibodies (McAb) with putative specificity for human IgA, the IgA subclasses, Am allotypes or secretory component (SC) were evaluated for immunoreactivity and specificity by nine laboratories employing immunodiffusion, agglutination, immunohistological assays, immunoblotting and direct binding and competitive inhibition enzyme...article 1996
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Braat, E.A.M. (author), Nauland, U. (author), Dooijewaard, G. (author), Rijken, D.C. (author), Gaubius Instituut TNO (author)Thrombin cleaves single-chain urokinase-type plasminogen activator (scu-PA) into a two-chain form (tcu-PA/T), which is virtually inactive in plasminogen activator assays. Little is known about the physiological importance of tcu-PA/T. To examine the occurrence of tcu-PA/T in vivo, we developed a sensitive and specific bioimmunoassay (BIA) for...article 1996
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Hennis, B.C. (author), Hoffmann, J.J.M.L. (author), Kluft, C. (author), Gaubius Laboratory Haemostasis Division, Department of Clinical Laboratories, Catharina Hospital, Eindhoven, Netherlands TNO Preventie en Gezondheid (author)Recently, two molecular weight forms of Histidine-rich Glycoprotein have been described which explain 59% of the variation in plasma HRG levels. Here, we demonstrate that this can partly be ascribed to a difference in specificity of the immuno assay for HRG towards the two alleles of the polymorphism.article 1996
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Nieuwenhuizen, W. (author), TNO Preventie en Gezondheid (author)Fibrinogen is a large heterogeneous family of closely related molecules consisting of three pairs of non-identical polypeptide chains: two Aα-, two Bβ- and two γ-chains, held together by disulphide bridges. The heterogeneity of fibrinogen is due to heterogeneities in all three chains. Four main types of assay are used to determine fibrinogen...article 1995
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Bos, R. (author), Revet, M. (author), Nieuwenhuizen, W. (author), Gaubius Laboratory TNO Preventie en Gezondheid (author)This article describes a two-step bio-immuno assay (BIA), which determines active (free) tissue-type plasminogen activator (t-PA) in (acidified) plasma. Plasma samples, diluted in buffer of pH 6.0, are added to the wells of a microtiter plate containing an immobilised monoclonal antibody which binds t-PA without affecting t-PA activity. After an...article 1994
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Nieuwenhuizen, W. (author), Gaubius Laboratory Instituut voor verouderings- en vaatziekten onderzoek TNO (author)Increased plasma levels of soluble fibrin are considered as molecular markers of an impending thrombotic event. Several methods to assess soluble fibrin have been in existence for many years. Most of those methods are nonspecific, semiquantitative or too laborious to be used in clinical practice. More recent methods are quantitative and...article 1993
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Huisman, L.G.M. (author), Meijer, P. (author), van Griensven, J. (author), Kluft, C. (author), Gaubius Laboratory Instituut voor verouderings- en vaatziekten onderzoek TNO (author)t-PA depleted citrated plasma was used to prepare standards of different molecular forms of plasminogen activator inhibitor 1 (PAI-1). These standards were used to evaluate the specificity of two new PAI-1 antigen assays: the TintElize PAI-1 antigen assay (cat. no. 210221) and the Innotest PAI-1. Differences in specificity were apparent: the...article 1992
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Medisch Biologisch Laboratorium TNO (author), van Loon, A.A.W.M. (author), Groenendijk, R.H. (author), Timmerman, A.J. (author), van der Schans, G.P. (author), Lohman, P.H.M. (author), Baan, R.A. (author)A simple, sensitive and fast immunochemical method has been developed to quantify the amount of DNA damage in cells of human blood after in vitro exposure to ionizing radiation. The technique is based on the enhancement of the radiation-induced single-strandedness, which occurs in DNA regions flanking strand breaks, by a controlled further...article 1992
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Binnema, D.J. (author), Dooijewaard, G. (author), van Iersel, J.J.L. (author), Turion, P.N.C. (author), Kluft, C. (author), Gaubius Instituut TNO (author)Apart from tissue-type plasminogen activator (t-PA) and urokinase-type plasminogen activator (u-PA), a third PA appears to occur in human plasma. Its activity is initiated when appropriate triggers of the contact system are added, and the activation depends on the presence of factor XII and prekallikrein in plasma. The activity of this, so...article 1990