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Holtman, W.L. (author), Roberts, M.R. (author), Wang, M. (author)Recently, we have demonstrated by two different methods that lipoxgenases (LOXs) and 14-3-3 proteins form interactions in barley embryos [Holtman, Roberts, Oppedijk, Testerink, van Zeijl and Wang (2000) FEBS Lett. 474, 48-52]. It was shown by both co-immunoprecipitations and surface-plasmon resonance experiments that 13-LOX, but not 9-LOX, forms...article 2000
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Fidder, A. (author), Noort, D. (author), Hulst, A.G. (author), de Jong, L.P.A. (author), Benschop, H.P. (author), Prins Maurits Laboratorium TNO (author)The development of a procedure for retrospective detection and quantitation of exposure to the arsenical dichloro(2-chlorovinyl)arsine (lewisite; L1) has been initiated. Upon incubation of human blood with [14C]L1 (20 nM-0.2 mM) in vitro, more than 90% of the total radioactivity was found in the erythrocytes and 25-50% of the radioactivity...article 2000
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van Nieuw Amerongen, G.P. (author), Delft, S.V. (author), Vermeer, M.A. (author), Collard, J.G. (author), van Hinsbergh, V.W.M. (author), Gaubius Instituut TNO (author)Endothelial cells (ECs) actively regulate the extravasation of blood constituents. On stimulation by vasoactive agents and thrombin, ECs change their cytoskeletal architecture and small gaps are formed between neighboring cells. These changes partly depend on a rise in [Ca2+](i) and activation of the Ca2+/calmodulin-dependent myosin light chain...article 2000
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Gaubius Instituut TNO (author), Tacken, P.J. (author), de Beer, F. (author), van Vark, L.C. (author), Havekes, L.M. (author), Hofker, M.H. (author), van Dijk, K.W. (author)The apolipoprotein (apo)E receptor 2 (apoER2) is a recently cloned member of the low-density lipoprotein (LDL) receptor (LDLR) family, showing a high homology with both the LDLR and the very-low-density lipoprotein (VLDL) receptor (VLDLR). In the present study, the binding characteristics of the apoER2 with respect to apoE and lipoprotein lipase...article 2000
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Noort, D. (author), Hulst, A.G. (author), de Jong, L.P.A. (author), Benschop, H.P. (author)To develop a mass spectrometric assay for the detection of sulfur mustard adducts with human serum albumin, the following steps were performed: quantitation of the binding of the agent to the protein by using [14C] sulfur mustard and analysis of acidic and tryptic digests of albumin from blood after exposure to sulfur mustard for identification...article 1999
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Myrup, B. (author), Rossing, P. (author), Jensen, T. (author), Gram, J. (author), Kluft, C. (author), Jespersen, J. (author), Gaubius instituut TNO (author)Objective: To investigate protein concentration changes during venous occlusion of proteins with reported affinity for extracellular matrix (plasminogen activator inhibitor type 1, antithrombin III, fibronectin and von Willebrand factor) in comparison with proteins with no reported affinity (albumin, tissue-type plasminogen activator,...article 1999
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van Rozendaal, B.A.W.M. (author), van de Lest, C.H.A. (author), van Eijk, M. (author), van Golde, L.M.G. (author), Voorhout, W.F. (author), van Helden, H.P.M. (author), Haagsman, H.P. (author)Collectins are carbohydrate binding proteins that are implicated in innate host defense. The lung collectins, surfactant proteins A and D (SP-A and SP-D), bind a variety of pathogens in vitro and influence phagocytosis by alveolar macrophages. In this report we show that SP-D binds endotoxin (lipopolysaccharide, LPS) in vivo in a rat model of...article 1999
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Gaubius instituut TNO (author), Jong, M.C. (author), Willems-van Dijk, K. (author), Dahlmans, V.E.H. (author), van der Boom, H. (author), Kobayashi, K. (author), Oka, K. (author), Siest, G. (author), Chan, L. (author), Hofker, M.H. (author), Havekes, L.M. (author)We have shown previously that human apolipoprotein (apo)Cl transgenic mice exhibit hyperlipidaemia, due primarily to an impaired clearance of very-low-density lipoprotein (VLDL) particles from the circulation. In the absence of at least the low-density-lipoprotein receptor (LDLR), it was shown that APOCI overexpression in transgenic mice...article 1999
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Osman, A.M. (author), Posthumus, M.A. (author), Veeger, C. (author), van Bladeren, P.J. (author), Laane, C. (author), Rietjens, I.M.C.M. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)This study reports the microperoxidase-8 (MP8)/H2O2-catalyzed dehalogenation of pentafluorophenol and pentachlorophenol, compounds whose toxic effects and persistence in the environment are well documented. The primary products of this dehalogenation reaction appear to be the corresponding tetrahalo-p-benzoquinones. Under the conditions used,...article 1998
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Gaubius Instituut TNO (author), Koopman, J.L. (author), Slomp, J. (author), de Bart, A.C.W. (author), Quax, P.H.A. (author), Verheijent, J.H. (author)The structural and functional properties of the urokinase-type plasminogen activator (u-PA) that are involved in the mitogenic effect of this proteolytic enzyme on human melanoma cells M14 and IF6 and the role of the u-PA receptor (u-PAR) in transducing this signal were analyzed. Native u- PA purified from urine induced a mitogenic response in...article 1998
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Noorman, F. (author), Barrett-Bergshoeff, M.M. (author), Bekkers, M. (author), Emeis, J.J. (author), Rijken, D.C. (author), Gaubius Instituut TNO (author)Dextran is used during surgery as a prophylactic agent to prevent deep venous thrombosis. Recently it has been shown that dextran increases t-PA plasma concentrations in patients. As dextran is a potential ligand for the mannose receptor, we studied whether this glucose-polymer would be able to inhibit mannose receptor-mediated clearance of t-PA...article 1997
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Laman, J.D. (author), van Meurs, M. (author), de Smet, B.J.G.L. (author), Schoneveld, A. (author), TNO Preventie en Gezondheid (author)The abundant presence of macrophages and activated T cells in atherosclerotic plaques suggests an active involvement of the immune system in this cardiovascular disease. However, insight into cellular interactions inducing relevant effector functions is still limited. Here, Jon Laman and colleagues propose that local interactions between CD40...article 1997
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Mulder, M. (author), Kohnert, U. (author), Fischer, S. (author), van Hinsbergh, V.W.M. (author), Verheijen, J.H. (author), Gaubius Instituut TNO (author)The Escherichia coli-expressed recombinant plasminogen activator (r-PA) comprising the kringle 2 and protease domains of human tissue-type plasminogen activator (t-PA) has a four-fold longer half-life time in the circulation than t-PA, possibly resulting in an increased opportunity for r-PA to interact with the endothelial lining. In the present...article 1997
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Gaubius Instituut TNO (author), de Man, F.H.A.F. (author), de Beer, F. (author), van der Laarse, A. (author), Smelt, A.H.M. (author), Havekes, L.M. (author)An in vitro assay to study lipolysis of very low density lipoproteins (VLDL) by heparan sulfate proteoglycan (HSPG-bound lipoprotein lipase (LPL) was developed. Optimal conditions for VLDL lipolysis by HSPG-bound LPL were obtained by incubating plastic wells with 0.5 ug HSPG and 1.5 ug LPL, subsequently. Control experiments with heparinase...article 1997
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Hissink, A.M. (author), Oudshoorn, M.J. (author), van Ommen, B. (author), Haenen, G.R.M.M. (author), van Bladeren, P.J. (author)The oxidative biotransformation of 1, 2-dichlorobenzene (1, 2-DCB) was investigated using hepatic microsomes from male Wistar, Fischer-344 and Sprague-Dawley (SD) rats, phenobarbital (PB)- and isoniazid (ISO) pretreated male Wistar rats and from man. In addition, microsomes from cell lines selectively expressing one cytochrome P450 (P4502E1, 1A1...article 1996
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Rijken, D.C. (author), Jie, A.F.H. (author), Gaubius Laboratory TNO Preventie en Gezondheid (author)Reteplase is a protein consisting of the kringle-2 and protease domains of tissue-type plasminogen activator (t-PA). Because intravenous heparin will be used as an adjunct to thrombolytic therapy with reteplase, we investigated the interactions in vitro between heparin and reteplase as well as between heparin and recombinant t-PA (alteplase) as...article 1996
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Booij, P. (author), Demel, R.A. (author), de Pater, B.S. (author), Kijne, J.W. (author), Centraal Instituut voor Voedingsonderzoek TNO TNO Voeding (author)Pea lectin (PSL) is a secretory sugar-binding protein, readily soluble in aqueous solutions of low osmolarity. However, PSL also appears to be associated with the plasma membrane at the tip of young pea root hairs. By using the Wilhelmy plate method, we found that PSL can insert into a lipid monolayer. This property appeared to be independent of...article 1996
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Gaubius instituut TNO (author), Hendriks, W.L. (author), van der Boom, H. (author), van Vark, L.C. (author), Havekes, L.M. (author)Lipoprotein lipase (LPL) stimulates the uptake of low-density lipoprotein (LDL) and very-low-density lipoprotein (VLDL) in different cell types, including macrophages, through bridging of LPL between lipoproteins and extracellular heparan sulphate proteoglycans (HSPG). Because macrophages produce LPL and because modified lipoproteins are present...article 1996
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Gaubius Instituut TNO (author), Sakharov, D.V. (author), Lijnen, H.R. (author), Rijken, D.C. (author)Staphylokinase (STA), a protein of bacterial origin, induces highly fibrin-specific thrombolysis both in human plasma in vitro and in pilot clinical trials. Using fluorescence microscopy, we investigated the spatial distribution of fluorescein isothiocyanate (FITC)-labeled STA during lysis of a plasma clot and its binding to purified fibrin...article 1996
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Dirven, H.A.A.M. (author), Dictus, E.L.J.T. (author), Broeders, N.L.H.L. (author), van Ommen, B. (author), van Bladeren, P.J. (author), Instituut CIVO-Toxicologie en Voeding TNO (author)Nonenzymatic and glutathione S-transferase (GST) catalyzed glutathione (GSH) conjugation has been postulated as a mechanism by which alkylating cytostatic drugs can be inactivated intracellularly. In this study, we describe studies on the glutathione-dependent biotransformation of thiotepa (tris(1-aziridinyl)phosphine sulfide), a trifunctional...article 1995