Searched for: subject:"enzyme%5C+assay"
(1 - 16 of 16)
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Abdul-Hussien, H. (author), Hanemaaijer, R. (author), Verheijen, J.H. (author), van Bockel, J.H. (author), Geelkerken, R.H. (author), Lindeman, J.H.N. (author), TNO Kwaliteit van Leven (author)
Background: Matrix metalloproteinase-9 (MMP-9) is thought to play a central role in abdominal aortic aneurysm (AAA) initiation. Doxycycline, a tetracycline analogue, has direct MMP-9-inhibiting properties in vitro, and it effectively suppresses AAA development in rodents. Observed inhibition of AAA progression, and contradictory findings in...
article 2009
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Gibbs, S. (author), van de Sandt, J.J.M. (author), Merk, H.F. (author), Lockley, D.J. (author), Pendlington, R.U. (author), Pease, C.K. (author), TNO Kwaliteit van Leven (author)
In this review, we discuss and compare studies of xenobiotic metabolism in both human skin and 3D human skin reconstructs. In comparison to the liver, the skin is a less studied organ in terms of characterising metabolic capability. While the skin forms the major protective barrier to environmental chemical exposure, it is also a potential...
article 2007
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Houben, E. (author), Uchida, Y. (author), Nieuwenhuizen, W.F. (author), de Paepe, K. (author), Vanhaecke, T. (author), Holleran, W.M. (author), Rogiers, V. (author), TNO Kwaliteit van Leven (author)
It has recently become evident that at least five ceramidase (CDase) isoforms are present in human epidermis, and that specifically acidic CDase (aCDase) and alkaline CDase (alkCDase) activities increase during keratinocyte differentiation, and thus might play a pivotal role(s) in permeability barrier function. Prior to investigating their...
article 2007
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Pronk, A. (author), Preller, L. (author), Raulf-Heimsoth, M. (author), Jonkers, I.C.L. (author), Lammers, J.-W. (author), Wouters, I.M. (author), Doekes, G. (author), Wisnewski, A.V. (author), Heederik, D. (author), TNO Kwaliteit van Leven (author)
Rationale: Associations between oligomeric isocyanate exposure, sensitization, and respiratory disease have received little attention, despite the extensive use of isocyanate oligomers. Objectives: To investigate exposure-response relationships of respiratory symptoms and sensitization in a large population occupationally exposed to isocyanate...
article 2007
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Kubben, F.J.G.M. (author), Sier, C.F.M. (author), van Duijn, W. (author), Griffioen, G. (author), Hanemaaijer, R. (author), van de Velde, C.J.H. (author), van Krieken, J.H.J.M. (author), Lamers, C.B.H.W. (author), Verspaget, H.W. (author), TNO Kwaliteit van Leven (author)
In a pioneer study, we showed 10 years ago that enhanced tissue levels of the matrix metalloproteinases (MMPs) MMP-2 and MMP-9 in gastric cancers, as determined by zymography, were related with worse overall survival of the patients. To corroborate these observations, we now assessed MMP-2 and MMP-9 with new techniques in an expanded group of...
article 2006
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Bogdanovic, J. (author), Koets, M. (author), Sander, I. (author), Wouters, I. (author), Meijster, T. (author), Heederik, D. (author), van Amerongen, A. (author), Doekes, G. (author), TNO Kwaliteit van Leven (author)
Background: Occupational allergen exposure assessment usually requires airborne dust sampling at the worksite followed by dust extraction and enzyme immunoassay (EIA) analysis at the laboratory. Use of semiquantitative lateral flow immunoassays (LFIAs) may allow a more rapid detection procedure with direct on-site demonstration of a bioallergen...
article 2006
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Parnham, M.J. (author), Bogaards, J.J.P. (author), Schrander, F. (author), Schut, M.W. (author), Orešković, K. (author), Mildner, B. (author), TNO Kwaliteit van Leven (author)
PLD-118 is a novel, oral antifungal drug, under development for the treatment of Candida infections. Possible metabolism of PLD-118 by rat, dog and human S9 liver homogenates and inhibition of human cytochrome P450 (CYP) enzymes were investigated. PLD-118 (10 and 100 μm) incubated for 0-60 min with S9 fractions and NADPH was determined by HPLC,...
article 2005
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van den Heuvel, E.G.H.M. (author), Wils, D. (author), Pasman, W.J. (author), Saniez, M.H. (author), Kardinaal, A.F.M. (author), TNO Kwaliteit van Leven (author)
Background: It is well documented that fermentation of carbohydrates that escape digestion exert several effects supposed to be beneficial for (colonic) health, including an increase in stool volume, a shorter intestinal transit time, production of short chain fatty acids and a decrease of colonic pH (Kritchevsky 1988). NUTRIOSE®FB is a dextrin...
article 2005
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Guimarães, A.H.C. (author), van Tilburg, N.H. (author), Vos, H.L. (author), Bertina, R.M. (author), Rijken, D.C. (author)
Thrombin activatable fibrinolysis inhibitor (TAFI) antigen levels exhibit a large interindividual variability in which genetic control seems to play a major role. However, recent reports have questioned the association between TAFI concentration and genotype, suggesting that variable antibody reactivity towards TAFI isoforms, particularly the...
article 2004
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Tchetverikov, I. (author), Ronday, H.K. (author), van El, B. (author), Kiers, G.H. (author), Verzijl, N. (author), TeKoppele, J.M. (author), Huizinga, T.W.J. (author), de Groot, J. (author), Hanemaaijer, R. (author), Gaubius Instituut TNO (author)
Objective: To analyse matrix metalloproteinases (MMPs) and tissue inhibitor-1 of MMPs (TIMP-1) levels in the systemic circulation and synovial fluid (SF) of patients with RA and to compare these levels with inflammatory and collagen degradation markers. Methods: ProMMP-1, -2, -3, -8, -9, TIMP-1, levels of MMP/ α2-macroglobulin complexes, and...
article 2004
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Blankvoort, B.M.G. (author), Aarts, J.M.M.J.G. (author), Schilt, R. (author), Geerdink, P. (author), Spenkelink, B. (author), Rodenburg, R.J.T. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)
Despite a ban by the European Union, the use of anabolic steroids and repartitioning agents in cattle is still occasionally observed. Due to continuing improvements in analytical techniques, very low detection limits for individual compounds have been achieved. In response to these developments, cocktails composed of several steroids have been...
article 2003
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Fidder, A. (author), Hulst, A.G. (author), Noort, D. (author), de Ruiter, R. (author), van der Schans, M.J. (author), Benschop, H.P. (author), Langenberg, J.P. (author), Prins Maurits Laboratorium TNO (author)
In this paper a novel and general procedure is presented for detection of organophosphate-inhibited human butyrylcholinesterase (HuBuChE), which is based on electrospray tandem mass spectrometric analysis of phosphylated nonapeptides obtained after pepsin digestion of the enzyme. The utility of this method is exemplified by the positive analysis...
article 2002
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Pots, A.M. (author), Gruppen, H. (author), van Diepenbeek, R. (author), van der Lee, J.J. (author), van Boekel, M.A.J.S. (author), Wijngaards, G. (author), Voragen, A.G.J. (author)
The content and biological activity of patatin and the protease inhibitors of molecular size 20-22 kDa present in whole potato tubers were investigated as a function of storage time. The amount of buffer-extractable protein decreased gradually during storage of whole potatoes of the cultivars Bintje and Desiree for 47 weeks whereas, for Elkana,...
article 1999
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Beekman, B. (author), Drijfhout, J.W. (author), Ronday, H.K. (author), TeKoppele, J.M. (author), Gaubius instituut TNO (author)
Elevated MMP activities are implicated in tissue degradation in, e.g., arthritis and cancer. The present study was designed to measure MMP enzyme activity in plasma. Free active MMP is unlikely to be present in plasma: upon entering the circulation, active MMP is expected to be captured by the proteinase inhibitor α2-macroglobulin (α2M)....
article 1999
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Beekman, B. (author), van El, B. (author), Drijfhout, J.W. (author), Ronday, H.K. (author), TeKoppele, J.M. (author), Gaubius Instituut TNO (author)
Stromelysin-1 (MMP-3) is an important member of the matrix metalloproteinase family. In joint-degrading diseases like arthritis, elevated levels of MMP-3 protein are detected in synovial fluid using immunological methods. However, these methods do not discriminate between active and inactive enzyme. In the present study, a specific stromelysin...
article 1997
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te Koppele, J.M. (author), Beekman, B. (author), Bloemhoff, W. (author), Drijfhout, J.W. (author), TNO Preventie en Gezondheid (author)
article 1995
Searched for: subject:"enzyme%5C+assay"
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