TY  - JOUR
A1  - Adami, Hans-Olov
A1  - Dragsted, Lars
A1  - Enig, Bent
A1  - Hansen, Jens
A1  - Haraldsdóttir, Jóhanna
A1  - Hill, Michael J.
A1  - Holm, Lars Erik
A1  - Knudsen, Ib
A1  - Larsen, Jens-Jorgen
A1  - Lutz, Werner K.
A1  - Osler, Merete
A1  - Overvad, Kim
A1  - Sabroe, Svend
A1  - Sanner, Tore
A1  - Strube, Michael
A1  - Sorensen, Thorkild I. A.
A1  - Thorling, Eivind B.
T1  - Report from the working group on diet and cancer.
N2  - No abstract available.
KW  - Krebs <Medizin>
KW  - Ernährung
Y1  - 1993
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-71601
ER  - 
TY  - JOUR
A1  - Alldrick, A. J.
A1  - Lutz, Werner K.
T1  - Covalent binding of [2-\(^{14}\)C]2-amino-3,8-dimethylimidazo[4,5-f]-quinoxaline (MeIQx) to mouse DNA in vivo
N2  - Fernale BALB/c mice were administered intragastrically with equimolar amounts of either [2-\(^{14}\)C]2-amino-3,8-dimethyi[ 4,5-J]qulnoxaline (MeiQx) or 2-acetylamino[9-\(^{14}\)C]fluorene (2AAF). DNA was isolated from tissues of mice killed either 6 or 24 h after administration. Analysis of liver DNA nucleotide digests by HPLC analysis revealed that all of the radioactivity was attributable to adduct formation. Tbe specific activities of DNA samples were converted to covalent bindlog indices (CBI, J.LIDOI adduct per mol DNA nucleotides/mmol chemical app6ed per kg animal body weight). CBI values of 25 and 9 were detennined for 2AAF and MeiQx in tbe llvers of mice killed 6 h after dosing. The values were in general agreement with the moderate carcinogenic potency of these compounds. The specific activities of DNA preparations obtained from the lddneys, spleens, stomachs, small intestines and large intestlnes of mice treated witb MeiQx and killed 6 h after doslng were S- to 35-times less tban those obtained witb the llver. DNA isolated from tbe lungs (a target organ for MeiQx tumorigenicity) of MeiQx-treated mice was not radiolabeUed at tbe limit of detection (CBI <0.3). With tbe exception of tbe gastrolntestinal tract, the specific activities of DNA samples isolated from mice killed 6 h after administration were higher than those from mice killed after 24 h.
KW  - Toxikologie
Y1  - 1989
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60832
ER  - 
TY  - JOUR
A1  - Baertsch, A.
A1  - Lutz, Werner K.
A1  - Schlatter, C.
T1  - Effect of inhalation exposure regimen on DNA binding potency of 1,2-dichloroethane in the rat
N2  - 1 ,2-Dichloroethane (DCE) was reported to be carcinogenic in rats in a long-tenn bioassay using gavage in com oil (24 and 48 mg/kg/day), but not by inhalation (up to 150-250 ppm, 7 h/day, 5 days/week). The daily dose metabolized was similar in the two experiments. In order to address this discrepancy, the genotoxicity of DCE was investigated in vivo under different exposure conditions. Fernale F-344 rats (183-188 g) were exposed to [1,2-14C]DCE in a closed inhalation chamber to either a low, constant concentration (0.3 mg/l = 80 ppm for 4 h) or to a peak concentration (up to 18 mg/1 = 4400 ppm) for a few minutes. After 12 h in the chamber, the dose metabolized under the two conditions was 34 mg/kg and 140 mg/k:g. DNA was isolated from liver and lung and was purified to constant specific radioactivity. DNA was enzymaticaBy hydrolyzed to the 3' -nucleotides which were separated by reverse phase HPLC. Most radioactivity eluted without detectable or with little optical density' indicating that the major part of the DNA radioactivity was due to covalent binding of the test compound. The Ievel of DNA adducts was expressed in the dose-nonnalized units ofthe Covalent Binding Index, CBI = f.Lmol adduct per mol DNA nucleotide/ mmol DCE per kg body wt. In liver DNA, the different exposure regimens resulted in markedly different CBI values of 1.8 and 69, for "constant-low" and ''peak" DCE exposure Ievels. In the Jung, the respective values were 0.9 and 31. It is concluded that the DNA darnage by DCE depends upon the concentration-time profile and that the carcinogenic potency determined in the gavage study should not be used for low-Ievel inhalation exposure.
KW  - Toxikologie
KW  - 1
KW  - 2-Dichloroethane
KW  - Carcinogens
KW  - DNA
KW  - binding
KW  - Rat
KW  - Inhalation
KW  - Dose response
Y1  - 1991
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60743
ER  - 
TY  - JOUR
A1  - Buss, P.
A1  - Caviezel, M.
A1  - Lutz, Werner K.
T1  - Linear dose-response relationship for DNA adducts in rat liver from chronic exposure to aflatoxin B1
N2  - Male F-344 rats were given eH]aßatoxin B1 (AFB1) in the drinking water at three exposure Ievels (0.02, 0.6, 20 J,Lgll, resulting in average dose Ievels of 2.2, 73, 2110 nglkg per day). After 4, 6 and 8 weeks, DNA was ~ted frorn the livers and analyzed for aßatoxin-DNA adducts. Tbe Ievel of DNA adducts did not increase significantly after 4 weeks, indicating that a steady-state for adduct formation and removal had nearly been reached. At 8 weeks, the adduct Ievels were 0.91, 32 and 850 nucleotide-aßatoxin adducts per to' nucleotides, i.e. clearly proportional to the dose. At the high dose Ievel, a near SO% tumor incidence would be expected in a 2-year bioassay with F -344 rats while the low dose used is within the range of estlmated human dietary exposures to aßatoxin in W estem countries. The proportionality seen between exposure and steady-state DNA adduct Ievel is discussed with respect to a linear extrapolation of the tumor risk to low dose.
KW  - Toxikologie
Y1  - 1990
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60779
ER  - 
TY  - JOUR
A1  - Bösch, R.
A1  - Friederich, U.
A1  - Lutz, Werner K.
A1  - Brocker, E.
A1  - Bachmann, M.
A1  - Schlatter, C.
T1  - Investigations on DNA binding in rat liver and in Salmonella and on mutagenicity in the Ames test by emodin, a natural anthraquinone
N2  - Emodin (1,6,8-trihydroxy-3-methylanthraquinone), an important aglycone found in natural anthraquinone glycosides frequently used in Iaxative drugs, was mutagenic in the Salmonellajmammalian microsome assay (Ames test) with a specificity for strain TA1537. The mutagenic activity was activationdependent with an optimal amount of S9 from Aroclor 1254-treated male Sprague-Dawley rats of 20% in the S9 mix (v jv) for 10 p.g emodin per plate. Heat inactivation of the S9 for 30 min at 60 ° C prevented mutagenicity. The addition of the cytochrome P-448 inhibitor 7,8-benzoflavone (18.5 nmoles per plate) reduced the mutagenic activity of 5.0 p.g emodin per plate to about one third, whereas the P-450 inhibitor metyrapone (up to 1850 nmoles per plate) was without effect. To test whether a metabolite" binds covalently to Salmonella DNA, [10-\(^{14}\)C]emodin was radiosynthesized, large batches of bacteria were incubated with [10-\(^{14}\)C]emodin and DNA was isolated. [G- \(^{3}\)H]Aflatoxin B1 (AFB1) was used as a positive control mutagen known to act via DNA binding. DNA obtained after aflatoxin treatment could be purified to constant specific activity. With emodin, the specific activity of DNA did not remain constant after repeated precipitations so that it is unlikely that the mutagenicity of emodin is due to covalent interaction of a metabolite with DNA. The antioxidants vitamin C and E or glutathione did not reduce the mutagenicity. Emodin was also negative with strain TA102. Thus, oxygen radicals are probably not involved. When emodin was incubated with S9 alone for up to 50 h before heat-inactivation of the enzymes and addition of bacteria, the mutagenic activity did not decrease. It is concluded that the mutagenicity of emodin is due to a chemically stable, oxidized metabolite forming physico-chemical associations with DNA, possibly of the intercalative type. In order to check whether an intact mammalian organism might be able to activate emodin to a DNA-binding metabolite, radiolabelled emodin was administered by oral gavage to male SD rats and liver DNA was isolated after 72 h. Very little radioactivity was associated with the DNA. Considering that DNA radioactivity could also be due to sources other than covalent interactions, an upper limit for the · covalent binding index, CBI = (p.moles chemical bound per moles DNA nucleotides)/(mmoles chemical administered per kg body weight) of 0.5 is deduced. This is 104 times below the CBI of AFB1. The demonstration of a lack of covalent interaction with DNA bothin Salmonellaandin rat liver is discussed in terms of a reduced hazard posed by emodin as a mutagenic drug in use in humans.
KW  - Toxikologie
KW  - DNA binding
KW  - (Rat liver)
KW  - (Salmonella)
KW  - Ames test
KW  - Emodin
KW  - Anthraquinone glycosides
KW  - natural
Y1  - 1987
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60913
ER  - 
TY  - JOUR
A1  - Büsser, M. T.
A1  - Lutz, Werner K.
T1  - Stimulation of DNA synthesis in rat and mouse liver by various tumor promoters
N2  - In order to investigate whether the Stimulation of liver DNA synthesis might be used to detect one class of hepatic tumor promoters, the incorporation of orally administered radiolabelled thymidine into liver DNA was detennined in rats and mice 24 h after a single oral gavage of test compounds at various dose Ievels. Three DNA-binding hepatocarcinogens, aflatoxin B1; benzidine and carbon tetrachloride, did not stimulate but rather inhibited DNA synthesis (not for CCla). Four hepatic tumor promoters, clofibrate, DDT, phenobarbital and thioacetamide, gave rise to a Stimulation in a dosedependent manner. Single oral doses between 0.02 and 0.3 mmol/kg were required to double the level of thymidine incorporation into liver DNA (= doubling dose, DD). Differentes between species or sex as obsprved in long-term carcinogenicity studies were reflected by a different stimulation of liver DNA synthesis. In agreement with the bioassay data, aldrin was positive only in male mice (DD = 0.007 mmol/kg) but not in male rats or female mice. 2,3, 7,8-TCDD was positive in male mice (DD = 10\(^{-6}\) mmol/kg) andin female rats (DD = 2 x 10\(^{-6}\) mmol/kg) but not in male rats. The assay was also able to distinguish between structural isomers with different carcinogenicities. [alpha]Hexachlorocyclohexane stimulated Iiver DNA synthesis with a doubling dose of about 0.2 mmol/kg in male rats whereas the [gamma]isomer was ineffective even at l mmol/kg. So far, only one result was inconsistent with carcinogenicity bioassay data. The different carcinogenicity of di(2-ethylhexyl)adipate (negative in rats) and di(2-ethylhe.xyl)phthalate (positive) was not detectable. 8oth plasticizers were positive in.this short-term system with DD's of 0. 7 mmol/kg for DEHA and 0.5 mmol/kg for DEHP. The proposed assay is discussed as an attempt to devise short-term assays for carcinogens not detected by the routine genotoxicity test systems.
KW  - Toxikologie
Y1  - 1987
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60908
ER  - 
TY  - JOUR
A1  - Cantoreggi, S.
A1  - Dietrich, D. R.
A1  - Lutz, Werner K.
T1  - Induction of cell proliferation in the forestomach of F344 rats following subchronic administration of styrene 7,8-oxide and butylated hydroxyanisole
N2  - The question addressed was whether Stimulation of cell proliferation could be responsible for tumor induction in the torestornach by styrene 7,8-oxide (SO). Male F344 rats were treated for 4 weeks with 0, 137,275, and 550 mglkg SO by p.o. gavage 3 times/week. Positive controls received 0, 0.5, I, and 2% butylated hydroxyanisole (BHA) in the diet for 4 weeks. Twenty-four h before termination of the experlment, the rats were implanted s.c. with an osmotic minipump deliverlog S-bromo-2'-deoxyuri· dine (BrdU). Cell proliferation in the forestomach was assessed by immunohistochemistry for BrdU incorporated into DNA. Cell number/mm section length and fraction of replicating cells (labeling Index) were determined in 3 domains of the forestomach, the saccus caecus, the midregion, and the prefundic region. With the exception of the prefundic reglon of the low-dose SO group, a significant increase of the labeling index was found in all regions both with SO and BHA. Rats treated with BHA showed, in addition, a dose-dependent increase in number and size of hyperplastic lesions. This was most pronounced in the prefundic region where carcinomas were reported to be localized. In this region, the number of dividing cells/mm section length was increased up to 17-fold. With SO, only marginal morphological changes were occasionally observed, despite the fact that the respective long-term treatment bad been reported to result in a higher carcinoma incidence than treatment with BHA. It ls concluded that the rate of replicating cells alone, numerically expressed by the labeling Index, is an lnsufficient tool for interpretlog the role of cell division in carcinogenesis. It is postulated that SO and BHA induce forestomach tumors via different mechanisms. While hyperplasia in the prefundic region most likely dominates the carcinogenicity of BHA, a mechanism combining marginal genotoxicity with strong promotion by increased cell proliferation appears to be involved in the tumorigenic action of SO.
KW  - Toxikologie
Y1  - 1993
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60669
ER  - 
TY  - CHAP
A1  - Cantoreggi, S.
A1  - Gupta, R. C.
A1  - Lutz, Werner K.
T1  - An improved 32P-postlabelling assay for detection and quantitation of styrene 7,8-oxide-DNA adducts
N2  - Using DNA modified with [7-3H]styrene 7,8-oxide (SO) in vitro we have standardized the 32P-postlabelling assay for detecting SO-DNA adducts. Nuclease P 1-enriched adducts were 32P-labelled and purified by high-salt ( 4.0 M ammonium formate, pH 6.1} C1s reverse-phase TLC. After elution from the layer with 2-butoxyethanol:H20 (4:6), adducts were separated by two-dimensional PEI cellulose TLC in non-urea solvents (2.0 M ammonium formate, pH 3.5, and 2.7 M sodium phosphate, pH 5.6). One major, three minor and several trace adducts were detected. The efficiency of the kinase reaction depended on the ATP concentration. Use of standard labelling conditions (['Y· 32P]ATP, <3000 Ci/mmol; <2 Mikromol) resulted in poor ( 4-7%) adduct recovery. An ATP concentration of 40 Mikromol, however, increased the labeJling efficiency by a factor of 5-8 (35-55% based on 3H-SO labelied DNA). The results indicate that the new separation technique is suitable for the relatively polar SO-DNA adducts and that high labelling efficiency can be achieved.
KW  - Medizin
Y1  - 1993
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-86305
ER  - 
TY  - JOUR
A1  - Cantoreggi, S.
A1  - Lutz, Werner K.
T1  - Covalent binding of styrene to DNA in rat and mouse
N2  - No abstract available
KW  - Toxikologie
Y1  - 1993
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60693
ER  - 
TY  - JOUR
A1  - Cantoreggi, S.
A1  - Lutz, Werner K.
T1  - Investigation of the covalent binding of styrene-7,8-oxide to DNA in rat and mouse
N2  - Styrene-7,8-oxide (SO), the main intennediate metabolite of styrene, induces hyperkeratosis and tumors in the forestomach of rats and mice upon chronic administration by gavage. The aim of this study was to investigate wbether DNA binding could be responsible for the carcinogenic effect observed. [7-\(^3\)H]SO was administered by oral gavage in com oll to male CD rats at two dose levels (1.65 or 240 mg/kg). After 4 or 24 h, forestomach, glandular stomach and Uver were exclsed, DNA was isolated and its radioactivity detennined. At the 4 h time polnt, the DNA radioactivity was below the Iimit of detection in the torestornach and the liver. Expressed in the units of the covalent bindlng Index, CBI = (pmol adduct/mol DNA nucleotide)/(mmol cbemical administeredlkg body wt), the DNA-binding potency was below 2.6 and 2.0 respectively. In the glandular stomach at 4 b, and in most 24 b samples, DNA was slightly radiolabeled. Enzymatic degradation of the DNA and separation by HPLC ofthe normal nucleotides sbowed that the DNA rad.ioactivity represented biosynthetic incorporation of radlolabel into newly synthesized DNA. The Iimit of detection of DNA adducts in the glandular stomach was 1.0. In a second experlment, [7-\(^3\)H]SO was administered by i.p. injection to male 86C3Fl rnice. Liver DNA was analyzed after 2 h. No radloactivity was detectable at a Iimit of detection of CBI < 0.6. In agreement with the relatively long half-life of SO in animals, the cbemical reactivity of SO appears to be too low to result in a detectable production of DNA adducts in an in vivo situation. Upon comparison with the DNA-binding of other carcinogens, a purely genotoxic mechanism of tumorigenJc action of SO is unlikely. The observed tumorigenic potency in the forestomach could be the result of strong tumor promotion by high-dose cytotoxicity foUowed by regenerative hyperplasia.
KW  - Toxikologie
Y1  - 1992
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60721
ER  -