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Vermeulen, M. (author), Boerboom, A.M.M.J.F. (author), Blankvoort, B.M.G. (author), Aarts, J.M.M.J.G. (author), Rietjens, I.M.C.M. (author), van Bladeren, P.J. (author), Vaes, W.H.J. (author), TNO Kwaliteit van Leven (author)Isothiocyanates are electrophiles that are able to induce phase II biotransformation enzyme gene expression via an electrophile-responsive element (EpRE) in the gene regulatory region. To study the potency of different isothiocyanates to induce the expression of EpRE-regulated genes, a Hepa-1c1c7 luciferase reporter cell line was exposed to...article 2009
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Jacobs, M.N. (author), Janssens, W. (author), Bernauer, U. (author), Brandon, E. (author), Coecke, S. (author), Combes, R. (author), Edwards, P. (author), Freidig, A. (author), Freyberger, A. (author), Kolanczyk, R. (author), Mc Ardie, C. (author), Mekenyan, O. (author), Schmieder, P. (author), Schrader, T. (author), Takeyoshi, M. (author), van der Burg, B. (author), TNO Kwaliteit van Leven (author)Legislation and prospective legislative proposals in for instance the USA, Europe, and Japan require, or may require that chemicals are tested for their ability to disrupt the hormonal systems of mammals. Chemicals found to test positive are considered to be endocrine active substances (EAS) and may be putative endocrine disruptors (EDs). To...article 2008
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TNO Kwaliteit van Leven (author), Madsen, L. (author), Pedersen, L.M. (author), Liaset, B. (author), Ma, T. (author), Petersen, R.K. (author), van den Berg, S. (author), Pan, J. (author), Müller-Decker, K.M. (author), Dülsner, E.D. (author), Kleemann, R. (author), Kooistra, T. (author), Døskeland, S.O. (author), Kristiansen, K. (author)The effect of n-6 polyunsaturated fatty acids (n-6 PUFAs) on adipogenesis and obesity is controversial. Using in vitro cell culture models, we show that n-6 PUFAs was pro-adipogenic under conditions with base-line levels of cAMP, but anti-adipogenic when the levels of cAMP were elevated. The anti-adipogenic action of n-6 PUFAs was dependent on a...article 2008
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Boerboom, A.M.J.F. (author), Vermeulen, M. (author), van der Woude, H. (author), Bremer, B.I. (author), Lee-Hilz, Y.Y. (author), Kampman, E. (author), van Bladeren, P.J. (author), Rietjens, I.M.C.M. (author), Aarts, J.M.M.J.G. (author), TNO Kwaliteit van Leven (author)The electrophile-responsive element (EpRE) is a transcriptional enhancer involved in cancer-chemoprotective gene expression modulation by certain food components. Two stably transfected luciferase reporter cell lines were developed, EpRE(hNQO1)-LUX and EpRE(mGST-Ya)-LUX, based on EpRE sequences from the human NAD(P)H:quinone oxidoreductase ...article 2006
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Sigoillot, C. (author), Record, E. (author), Belle, V. (author), Robert, J.L. (author), Levasseur, A. (author), Punt, P.J. (author), van den Hondel, C.A.M.J.J. (author), Fournel, A. (author), Sigoillot, J.C. (author), Asther, M. (author), TNO Voeding (author)Three laccases, a natural form and two recombinant forms obtained from two different expression hosts, were characterized and compared for paper pulp bleaching. Laccase from Pycnoporus cinnabarinus, a well known lignolytic fungus, was selected as a reference for this study. The corresponding recombinant laccases were produced in Aspergillus...article 2004
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Price, R.J. (author), Scott, M.P. (author), Walters, D.G. (author), Stierum, R.H. (author), Groten, J.P. (author), Meredith, C. (author), Lake, B.G. (author), TNO Voeding (author)The effect of thiabendazole (TB) on some rat hepatic xenobiotic metabolising enzymes has been investigated. Male Sprague-Dawley rats were fed control diet or diets containing 102-5188 ppm TB for 28 days. As a positive control for induction of hepatic xenobiotic metabolism, rats were also fed diets containing 1457 and 10,155 ppm butylated...article 2004
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TNO Preventie en Gezondheid (author), Vernooy, J.H.J. (author), Lindeman, J.H.N. (author), Jacobs, J.A. (author), Hanemaaijer, R. (author), Wouters, E.F.M. (author)Background: The increased expression of matrix metalloproteinases (MMPs) is considered to be a key factor in the development of COPD. Net MMP activity represents a tightly regulated process, which is not addressed by conventional investigation methods such as messenger RNA or protein expression. Yet, quantitative data on MMP activity in the...article 2004
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Heijne, W.H.M. (author), Stierum, R.H. (author), Slijper, M. (author), van Bladeren, P.J. (author), van Ommen, B. (author)Toxicogenomics is a novel approach integrating the expression analysis of thousands of genes (transcriptomics) or proteins (proteomics) with classical methods in toxicology. Effects at the molecular level are related to pathophysiological changes of the organisms, enabling detailed comparison of mechanisms and early detection and prediction of...article 2003
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Wolken, W.A.M. (author), van Loo, W.J.V. (author), Tramper, J. (author), van der Werf, M.J. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)A novel lyase, combining hydratase and aldolase activity, that converts citral into methylheptenone and acetaldehyde, was purified from spores of Penicillium digitatum. Remarkably, citral lyase activity was induced 118-fold by incubating nongerminating spores with the substrate, citral. This cofactor independent hydratase/aldolase, was purified...article 2002
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van der Werf, M.J. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)A Baeyer-Villiger mono-oxygenase (BVMO), catalysing the NADPH- and oxygen-dependent oxidation of the monocyclic monoterpene ketones 1-hydroxy-2-oxolimonene, dihydrocarvone and menthone, was purified to homogeneity from Rhodococcus erythropolis DCL14. Monocyclic monoterpene ketone mono-oxygenase (MMKMO) is a monomeric enzyme of molecular mass 60...article 2000
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van den Brink, J.M. (author), Punt, P.J. (author), van Gorcom, R.F.M. (author), van den Hondel, C.A.M.J.J. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)Cytochrome P450 enzyme systems are found throughout nature and are involved in many different, often complex, bioconversions. In the endoplasmic reticulum of the filamentous fungus Aspergillus niger a cytochrome P450 enzyme system is present that is capable of the para-hydroxylation of benzoate. The expression of the two genes encoding the...article 2000
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van Bladeren, P.J. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)In general, glutathione conjugation is regarded as a detoxication reaction. However, depending on the properties of the substrate, bioactivation is also possible. Four types of activation reaction have been recognized: direct-acting compounds, conjugates that are activated through cysteine conjugate beta-lyase, conjugates that are activated...article 2000
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van der Kop, D.A.M. (author), Schuyer, M. (author), Pinas, J.E. (author), van der Zaal, B.J. (author), Hooykaas, P.J.J. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)Transgenic arabidopsis plants were isolated that contained a T-DNA construct in which the promoter of an auxin-inducible glutathione S-transferase (GST) gene from tobacco was fused to the kanamycin resistance (nptII) as well as to the β-glucuronidase (gusA) reporter gene. Subsequently, seeds were treated with EMS to obtain mutants in which both...article 1999
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Post, S.M. (author), Paul Zoeteweij, J. (author), Bos, M.H.A. (author), de Wit, E.C.M. (author), Havinga, R. (author), Kuipers, F. (author), Princen, H.M.G. (author), Gaubius instituut TNO (author)Acyl-coenzyme A:cholesterol acyltransferase (ACAT) inhibitors are currently in clinical development as potential lipid-lowering and antiatherosclerotic agents. We investigated the effect of avasimibe (C1- 1011), a novel ACAT inhibitor, on bile acid synthesis and cholesterol 7α- hydroxylase in cultured rat hepatocytes and rats fed different diets...article 1999
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Monshouwer, M. (author), van 't Klooster, G.A.E. (author), Nijmeijer, S.M. (author), Witkamp, R.F. (author), van Miert, A.S.J.P.A.M. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)Despite the fact that pigs are increasingly used in pharmacological and toxicological studies, knowledge on the enzymes which metabolize xenobiotics, in particular cytochrome P450 (CYP) enzymes, in pigs is still very limited. Primary cultures of pig hepatocytes were used to characterize CYP enzymes. The characterization was performed at the...article 1998
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Sherratt, P.J. (author), Manson, M.M. (author), Thomson, A.M. (author), Hissink, E.A.M. (author), Neal, G.E. (author), van Bladeren, P.J. (author), Green, T. (author), Hayes, J.D. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)A characteristic feature of the class Theta glutathione S-transferase (GST) T1-1 is its ability to activate dichloromethane and dibromoethane by catalysing the formation of mutagenic conjugates. The level of the GSTT1 subunit within tissues is an important determinant of susceptibility to the carcinogenic effects of these dihaloalkanes. In the...article 1998
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Post, S.M. (author), de Wit, E.C.M. (author), Princen, H.M.G. (author), Gaubius Instituut TNO (author)Consumption of boiled coffee raises serum cholesterol levels in humans. The diterpenes cafestol and kahweol in boiled coffee have been found to be responsible for the increase. To investigate the biochemical background of this effect, we studied the effects of cafestol and a mixture of cafestol/kahweol/isokahweol (48:47:5 w/w) on bile acid...article 1997
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Gouka, R.J. (author), Hessing, J.G.M. (author), Punt, P.J. (author), Stam, H. (author), Musters, W. (author), van den Hondel, C.A.M.J.J. (author), TNO Voeding (author)A new, highly inducible fungal promoter derived from the Aspergillus awamori 1,4-β-endoxylanase A (exlA) gene is described. Induction analysis, carried out with the wild-type strain in shake flasks, showed that exlA expression is regulated at the transcriptional level. Using a β-glucuronidase (uidA) reporter strategy, D-xylose was shown to be an...article 1996
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Nijhoff, W.A. (author), Mulder, T.P.J. (author), Verhagen, H. (author), van Poppel, G. (author), Peters, W.H.M. (author)The effects of consumption of glucosinolate-containing Brussels sprouts on plasma and urinary glutathione S-transferase (GST) class-α and -π were investigated. Five male and five female non-smoking volunteers were randomly assigned to two groups in a crossover design. Five persons started on a glucosinolate-free diet (control period), while the...article 1995
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Nijhuis, E.W.P. (author), Hinloopen, B. (author), van Lier, R.A.W. (author), Nagelkerken, L. (author), TNO Preventie en Gezondheid (author)Human CD45RA+ ('naive') and CD45RO+ ('memory') CD4+ T cells were compared with respect to their sensitivity to dexamethasone (DEX). In three different activation pathways, i.e. (i) immobilized anti-CD3, (ii) immobilized anti-CD3 plus soluble anti-CD28 and (iii) soluble anti-CD2 plus soluble anti-CD28, naive CD4+ T cells appeared more sensitive...article 1995
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