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(1 - 17 of 17)
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van Zanden, J.J. (author), Geraets, L. (author), Wortelboer, H.M. (author), van Bladeren, P.J. (author), Rietjens, I.M.C.M. (author), Cnubben, N.H.P. (author), TNO Voeding (author)
The objective of this study was to investigate the structural requirements necessary for inhibition of glutathione S-transferase P1-1 (GSTP1-1) and GS-X pump (MRP1 and MRP2) activity by structurally related flavonoids, in GSTP1-1 transfected MCF7 cells (pMTG5). The results reveal that GSTP1-1 activity in MCF7 pMTG5 cells can be inhibited by some...
article 2004
document
Jeurissen, S.M.F. (author), Punt, A. (author), Boersma, M.G. (author), Bogaards, J.J.P. (author), Fiamegos, Y.C. (author), Schilter, B. (author), van Bladeren, P.J. (author), Cnubben, N.H.P. (author), Rietjens, I.M.C.M. (author), TNO Kwaliteit van Leven (author)
Human cytochrome P450 enzymes involved in the bioactivation of estragole to its proximate carcinogen 1′-hydroxyestragole were identified and compared to the enzymes of importance for 1′-hydroxylation of the related alkenylbenzenes methyleugenol and safrole. Incubations with Supersomes revealed that all enzymes tested, except P450 2C8, are...
article 2007
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Cnubben, N.H. (author), Wortelboer, H.M. (author), van Zanden, J.J. (author), Rietjens, I.M. (author), van Bladeren, P.J. (author), TNO Kwaliteit van Leven (author)
Membrane transport proteins belonging to the ATP-binding cassette (ABC) family of transport proteins play a central role in the defence of organisms against toxic compounds, including anticancer drugs. However, for compounds that are designed to display a toxic effect, this defence system diminishes their effectiveness. This is typically the...
article 2005
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Boersma, M.G. (author), van der Woude, H. (author), Bogaards, J. (author), Boeren, S. (author), Vervoort, J. (author), Cnubben, N.H.P. (author), van Iersel, M.L.P.S. (author), van Bladeren, P.J. (author), Rietjens, I.M.C.M. (author), TNO Voeding (author)
article 2002
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Cnubben, N.H.P. (author), Rommens, A.J.M. (author), Oudshoorn, M.J. (author), van Bladeren, P.J. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)
article 1998
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Usta, M. (author), Wortelboer, H.M. (author), Vervoort, J. (author), Boersma, M.G. (author), Rietjens, I.M.C.M. (author), van Bladeren, P.J. (author), Cnubben, N.H.P. (author), TNO Kwaliteit van Leven (author)
Curcumin, an α,β-unsaturated carbonyl compound, reacts with glutathione, leading to the formation of two monoglutathionyl curcumin conjugates. In the present study, the structures of both glutathione conjugates of curcumin were identified by LC-MS and one- and two-dimensional 1H NMR analysis, and their formation in incubations with human...
article 2007
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van Iersel, M.L.P.S. (author), Cnubben, N.H.P. (author), Smink, N. (author), Koeman, J.H. (author), van Bladeren, P.J. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)
The cyclopentenone prostaglandin A2 (PGA2) is known to inhibit cell proliferation, and metabolism of this compound thus might be important in controlling its ultimate function. The glutathione-related metabolism of PGA2 was therefore investigated both with purified glutathione S-transferase P1-1 (GSTP1-1) and with IGR-39 human melanoma cells....
article 1999
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van Iersel, M.L.P.S. (author), Cnubben, N.H.P. (author), Smink, N. (author), Koeman, J.H. (author), van Bladeren, P.J. (author)
article 1999
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van Zanden, J.J. (author), Hamman, O.B. (author), van Iersel, M.L.P.S. (author), Boeren, S. (author), Cnubben, N.H.P. (author), Lo Bello, M. (author), Vervoort, J. (author), van Bladeren, P.J. (author), Rietjens, I.M.C.M. (author)
In the present study, the inhibition of human glutathione S-transferase P1-1 (GSTP1-1) by the flavonoid quercetin has been investigated. The results show a time- and concentration-dependent inhibition of GSTP1-1 by quercetin. GSTP1-1 activity is completely inhibited upon 1 h incubation with 100 μM quercetin or 2 h incubation with 25 μM quercetin...
article 2003
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Cnubben, N.H.P. (author), Rietjens, I.M.C.M. (author), Wortelboer, H. (author), van Zanden, J.J. (author), van Bladeren, P.J. (author), Instituut CIVO-Toxicologie en Voeding TNO (author)
This review summarizes current knowledge on glutathione (GSH) associated cellular processes that play a central role in defense against oxidative stress. GSH itself is a critical factor in maintaining the cellular redox balance and has been demonstrated to be involved in regulation of cell signalling and repair pathways. Enhanced expression of...
article 2001
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Brand, W. (author), Schutte, M.E. (author), Williamson, G. (author), van Zanden, J.J. (author), Cnubben, N.H.P. (author), Groten, J.P. (author), van Bladeren, P.J. (author), Rietjens, I.M.C.M. (author), TNO Kwaliteit van Leven (author)
The transcellular transport of ingested food ingredients across the intestinal epithelial barrier is an important factor determining bioavailability upon oral intake. This transcellular transport of many chemicals, food ingredients, drugs or toxic compounds over the intestinal epithelium can be highly dependent on the activity of membrane bound...
article 2006
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van Zanden, J.J. (author), de Mul, A. (author), Wortelboer, H.M. (author), Usta, M. (author), van Bladeren, P.J. (author), Rietjens, I.M.C.M. (author), Cnubben, N.H.P. (author), TNO Kwaliteit van Leven (author)
In the present study, the effects of myricetin on either MRP1 or MRP2 mediated vincristine resistance in transfected MDCKII cells were examined. The results obtained show that myricetin can inhibit both MRP1 and MRP2 mediated vincristine efflux in a concentration dependent manner. The IC50 values for cellular vincristine transport inhibition by...
article 2005
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Wortelboer, H.M. (author), Usta, M. (author), van Zanden, J.J. (author), van Bladeren, P.J. (author), Rietjens, I.M.C.M. (author), Cnubben, N.H.P. (author), TNO Kwaliteit van Leven (author)
To study the possible interplay between glutathione metabolism of and MRP inhibition by thiol reactive compounds, the interactions of a series of α,β-unsaturated carbonyl compounds with multidrug resistance proteins 1 and 2 (MRP1/ABCC1 and MRP2/ABCC2) were studied. α,β-Unsaturated carbonyl compounds react with glutathione, and therefore either...
article 2005
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Wortelboer, H.M. (author), Usta, M. (author), van der Velde, A.E. (author), Boersma, M.G. (author), Spenkelink, B. (author), van Zanden, J.J. (author), Rietjens, I.M.C.M. (author), van Bladeren, P.J. (author), Cnubben, N.H.P. (author)
The multidrug resistance proteins MRP1 and MRP2 are efflux transporters with broad substrate specificity, including glutathione, glucuronide, and sulfate conjugates. In the present study, the interaction of the dietary polyphenol curcumin with MRP1 and MRP2 and the interplay between curcumin-dependent MRP inhibition and its glutathione-dependent...
article 2003
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Wortelboer, H.M. (author), Balvers, M.G.J. (author), Usta, M. (author), van Bladeren, P.J. (author), Cnubben, N.H.P. (author), TNO Kwaliteit van Leven (author)
The interactions of three heavy metal-containing compounds, cisplatin (CDDP), arsenic trioxide (As2O3), and mercury dichloride (HgCl2), with the multidrug resistance transporters MRP1 and MRP2 and the involvement of glutathione (GSH)-related processes herein were investigated. In Madin-Darby canine kidney cells stably expressing MRP1 or MRP2,...
article 2008
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Instituut CIVO-Toxicologie en Voeding TNO (author), Zaman, G.J.R. (author), Cnubben, N.H.P. (author), van Bladeren, P.J. (author), Evers, R. (author), Borst, P. (author)
The multidrug resistance protein MRP has been shown to mediate the transport of glutathione S-conjugates across membranes. In this study we demonstrate that the glutathione S-conjugate of the diuretic drug ethacrynic acid, which is an efficient inhibitor of glutathione S-transferases, is a high-affinity substrate and inhibitor of the glutathione...
article 1996
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Centraal Instituut voor Voedingsonderzoek TNO TNO Voeding (author), Evers, R. (author), Cnubben, N.H.P. (author), Wijnholds, J. (author), van Deemter, L. (author), van Bladeren, P.J. (author), Borst, P. (author)
The human multidrug resistance protein MRP1 mediates transport of organic substrates conjugated to glutathione, glucuronide, or sulfate. The naturally occurring prostaglandins A1 and A2 can form two diastereomeric glutathione S-conjugates, and it has been speculated that these might be substrates for MRP1. Here we present evidence that polarized...
article 1997
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