Mutagenicity and synthesis of alpha-substituted N-nitrosamines: derivatives with dithiocarbamic acid.

abstract：:We conducted a cross-sectional molecular epidemiological study of coke oven workers exposed to the established carcinogen polycyclic aromatic hydrocarbons (PAHs) to evaluate the relationships between both traditional 'exposure markers' and a series of biomarkers, including urinary 1-hydroxypyrene as a marker of intern...

journal_title：Carcinogenesis

authors： Pan G,Hanaoka T,Yamano Y,Hara K,Ichiba M,Wang Y,Zhang J,Feng Y,Shujuan Z,Guan D,Gao G,Liu N,Takahashi K

更新日期：1998-11-01 00:00:00

abstract：:Cancer-associated fibroblasts (CAFs) have been considered to play an important role for tumor progression of cancer. Solid tumors contain heterogeneous distribution of oxygen in their microenvironments. This study investigated the growth signaling of gastric cancer (GC) cells in focus on the interaction with CAFs and ...

journal_title：Carcinogenesis

authors： Kinoshita H,Yashiro M,Fukuoka T,Hasegawa T,Morisaki T,Kasashima H,Masuda G,Noda S,Hirakawa K

更新日期：2015-12-01 00:00:00

abstract：:We studied the modulating effects of caffeic acid and chlorogenic acid (two common coffee polyphenols) on the in vitro methylation of synthetic DNA substrates and also on the methylation status of the promoter region of a representative gene in two human cancer cells lines. Under conditions that were suitable for the ...

journal_title：Carcinogenesis

authors： Lee WJ,Zhu BT

更新日期：2006-02-01 00:00:00

abstract：:Soy-based products consumed in Asian countries are minimally processed whereas in the USA many of the soy foods and soy ingredients are highly processed. Soy foods contain complex mixtures of bioactive compounds, which may interact with one another. The objective of this study was to evaluate the ability of various so...

journal_title：Carcinogenesis

authors： Allred CD,Allred KF,Ju YH,Goeppinger TS,Doerge DR,Helferich WG

更新日期：2004-09-01 00:00:00

abstract：:The expression of human placental type glutathione S-transferase (GST-pi) was investigated in human cutaneous carcinoma in situ, that is, actinic keratosis and Bowen's disease, and compared with that in normal skin, using Northern blot and immunohistochemical analysis. In Northern blot examination, the expression of G...

journal_title：Carcinogenesis

authors： Shimizu K,Toriyama F,Zhang HM,Yoshida H

更新日期：1995-10-01 00:00:00

abstract：:The mutagen sensitivity assay is an in vitro measure of DNA repair capacity used to evaluate intrinsic susceptibility for cancer. The high heritability of mutagen sensitivity to different mutagens validates the use of this phenotype to predict cancer susceptibility. However, genetic determinants of mutagen sensitivity...

journal_title：Carcinogenesis

authors： Leng S,Stidley CA,Bernauer AM,Picchi MA,Sheng X,Frasco MA,Van Den Berg D,Gilliland FD,Crowell RE,Belinsky SA

更新日期：2008-07-01 00:00:00

abstract：:Loss of gap junctional intercellular communication (GJIC) is a characteristic of cancer cells. Since a coordinated interaction of epithelial tumor cells with stromal cells is a prerequisite for tumor invasion and metastasis, the present study was designed to test the hypothesis that skin-derived tumor cells may modula...

journal_title：Carcinogenesis

authors： Stuhlmann D,Ale-Agha N,Reinehr R,Steinbrenner H,Ramos MC,Sies H,Brenneisen P

更新日期：2003-11-01 00:00:00

abstract：:Glycyrrhizin (GL) is widely used in Japan as a therapeutic agent for chronic active liver diseases. However, its action on hepatocarcinogenesis remains to be elucidated. To clarify its effect, mice treated with diethylnitrosamine (NDEA) with or without GL were analyzed. Five-week-old male BALB/c mice were divided into...

journal_title：Carcinogenesis

authors： Shiota G,Harada K,Ishida M,Tomie Y,Okubo M,Katayama S,Ito H,Kawasaki H

更新日期：1999-01-01 00:00:00

abstract：:3-Methylcholanthrene (3-MC) pretreatment induces the liver microsomal 2-acetylaminofluorene (2-AAF) N-hydroxylase activity of C57BL6 responsive mice. The same pretreatment modifies this enzyme by significantly increasing its apparent Km value which, moreover, becomes protein concentration dependent. After 3-MC inducti...

journal_title：Carcinogenesis

authors： Razzouk C,Batardy-Grégoire M,Roberfroid M

更新日期：1982-01-01 00:00:00

abstract：:Occupational exposure to styrene was studied in nine workers of a hand lamination plant in Bohemia. Personal dosimeters were used to monitor the styrene workplace exposure, and the levels of styrene in blood and mandelic acid in urine were measured. Blood samples were taken at four occasions during a 7 month period to...

journal_title：Carcinogenesis

authors： Vodicka P,Bastlová T,Vodicková L,Peterková K,Lambert B,Hemminki K

更新日期：1995-07-01 00:00:00

abstract：:Treatment of human skin fibroblasts in early S-phase with (+-)7 beta,8 alpha-dihydroxy-9 alpha,10 alpha-epoxy-7,8,9,10- tetrahydrobenzo[a]pyrene (BPDE-I) results in more extensive modification of early replicating DNA than parental DNA. We have investigated the effects of benzamide (BZ) and 3-aminobenzamide (3-ABZ), i...

journal_title：Carcinogenesis

authors： Kurian P,Kumari HL,Milo GE

更新日期：1992-03-01 00:00:00

abstract：:Okadaic acid is both a potent inhibitor of protein serine/threonine phosphatases and a tumor promoter in the mouse skin model. We have previously shown that at non-toxic nanomolar concentrations okadaic acid reversibly inhibits induction (promotion) by PDGF of transformed cells by the 'complete' and 'two-stage' protoc...

journal_title：Carcinogenesis

authors： Dean NM,Mordan LJ,Tse K,Mooberry SL,Boynton AL

更新日期：1991-04-01 00:00:00

abstract：:We investigated, in a cloned hamster tracheal epithelial cell line HTE-B, the effects of inhibitors of DNA topoisomerase, novobiocin and nalidixic acid; of DNA polymerase, 1-beta-arabinofuranosylcytosine (ara-C) and 2',3'-dideoxythymidine; of ribonucleotide reductase, hydroxyurea; and of poly(ADP-ribose)synthetase, 3-...

journal_title：Carcinogenesis

authors： Ireland CM,Eastman A,Bresnick E

更新日期：1984-02-01 00:00:00

abstract：:Reactive intermediates (ultimate mutagens/carcinogens) generated by alkylating agents are unstable and difficult to characterize by chemical means. We have used a genetic system to distinguish the in vivo interactions of eight carcinogenic methylating agents and five ethylating agents by the patterns of induced mutati...

journal_title：Carcinogenesis

authors： Elespuru RK,Stupar LL,Gordon JA

更新日期：1991-07-01 00:00:00

abstract：:The possibility that ascorbic acid, as a nucleophile, may inhibit mutagenicity induced by electrophilic metabolites of N-nitroso compounds was examined. In vitro data are presented to show that ascorbic acid does not decrease the mutagenicity of N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) in a modified Ames bacterial ...

journal_title：Carcinogenesis

authors： Norkus EP,Kuenzig WA

更新日期：1985-11-01 00:00:00

abstract：:Feeding male Wistar rats a choline-deficient diet containing 0.07% DL-ethionine (CDE diet) for up to 5 weeks results in the production of two distinct non-parenchymal cell populations, oval and duct-like cells. These cells can undergo replication and display different patterns of expression of glutathione S-transferas...

journal_title：Carcinogenesis

authors： Tee LB,Kirilak Y,Huang WH,Morgan RH,Yeoh GC

更新日期：1994-12-01 00:00:00

abstract：:Epidemiological studies have suggested that frequent olive oil consumption may be a protective factor against lung cancer formation. Squalene, a characteristic compound in olive oil, is an inhibitor of 3-hydroxy-3-methylglutaryl coenzyme A reductase activity and has been proposed to inhibit the farnesylation of ras on...

journal_title：Carcinogenesis

authors： Smith TJ,Yang GY,Seril DN,Liao J,Kim S

更新日期：1998-04-01 00:00:00

abstract：:Ouabain resistance (ouar) and 6-thioguanine resistance (6-TGr) mutation frequencies were measured in Chinese hamster ovary cells after treatment with N-ethyl-N-nitrosourea (ENU) for varying periods of time. Maximal mutation frequency at the Na+/K+ ATPase gene locus (ouar mutations) was attained within 5 min of exposur...

journal_title：Carcinogenesis

authors： Dogliotti E,Vitelli A,Terlizzese M,Di Muccio A,Calcagnile A,Saffiotti U,Bignami M

更新日期：1987-01-01 00:00:00

abstract：:The polysubstituted benzamide derivative metoclopramide (MCA) has previously been shown to enhance the effect of cisplatin and ionizing radiation treatment of xenografted human squamous cell carcinomas from the head and neck region. In the present work we show that MCA decreases the nucleoid sedimentation rate, indica...

journal_title：Carcinogenesis

authors： Lybak S,Pero RW

更新日期：1991-09-01 00:00:00

abstract：:This commentary was written to stimulate thoughts on, and consideration of, enzyme expression data in target organs when investigating possible associations between polymorphisms in carcinogen activation enzymes, lifestyle/dietary factors and cancer risk. The lung and breast are taken as examples. There is overwhelmin...

journal_title：Carcinogenesis

authors： Williams JA

更新日期：2001-02-01 00:00:00

abstract：:The transcription factor Sp1 has been implicated in cell-type-specific activation of transforming growth factor-beta (TGFbeta) target genes in normal epithelial cells as well as in aberrant gene activation by TGFbeta in epithelial tumor cells. Here, we have examined the interaction of Sp1 with components of the Smad s...

journal_title：Carcinogenesis

authors： Jungert K,Buck A,Buchholz M,Wagner M,Adler G,Gress TM,Ellenrieder V

更新日期：2006-12-01 00:00:00

abstract：:One hundred forty-seven female Sprague-Dawley rats were divided into 5 groups and at 60 days of age were treated i.g. with 5 mg of 7,12-dimethylbenzanthracene (DMBA) suspended in 1.0 ml of sesame oil. Selenium (Se), as selenium dioxide (SeO2), was administered in the drinking water to 4 of the 5 groups (30 rats/group)...

journal_title：Carcinogenesis

authors： Welsch CW,Goodrich-Smith M,Brown CK,Greene HD,Hamel EJ

更新日期：1981-01-01 00:00:00

abstract：:In two separate in vivo studies, ethionine was evaluated for carcinogenic activity in mice. In the first study, DL-ethionine was fed in a chow diet at 0 (controls), 0.1 (low dose, LD) and 0.25% (high dose, HD) concentrations to the following groups of mice (30 animals/group): Swiss Webster CD-1 females, BALB/c males, ...

journal_title：Carcinogenesis

authors： Hoover KL,Hyde CL,Wenk ML,Poirier LA

更新日期：1986-07-01 00:00:00

abstract：:Insulin-like growth factor-II (IGF-II) may be a prognostic marker in ovarian cancer, and its intronic single nucleotide polymorphism (SNP) rs4320932 has been associated with risk of the disease. We determined whether rs4320932 is associated with IGF-II expression and patient survival in ovarian cancer, and explored wh...

journal_title：Carcinogenesis

authors： Lu L,Risch E,Deng Q,Biglia N,Picardo E,Katsaros D,Yu H

更新日期：2013-09-01 00:00:00

abstract：:Although epidemiological evidence in humans and bile acid feeding studies in rodents implicate bile acids as tumor promoters, the role of endogenous bile acids in colon carcinogenesis remains unclear. In this study, we exploited mice deficient in the ileal apical sodium-dependent bile acid transporter (ASBT, encoded b...

journal_title：Carcinogenesis

authors： Raufman JP,Dawson PA,Rao A,Drachenberg CB,Heath J,Shang AC,Hu S,Zhan M,Polli JE,Cheng K

更新日期：2015-10-01 00:00:00

abstract：:The mutagenicities of 2-aminodipyrido [1,2-a:3',2'-d] imidazole (Glu-P-2, a mutagen obtained from pyrolysate of glutamic acid) and six methyl substituted derivatives of Glu-P-2 were tested with Salmonella typhimurium TA98 and TA100 with S-9 mix. Glu-P-1 (6-Me-Glu-P-2) was the strongest mutagen to TA98 and TA100. 3-Me-...

journal_title：Carcinogenesis

authors： Takeda K,Shudo K,Okamoto T,Nagao M,Wakabayashi K,Sugimura T

更新日期：1980-01-01 00:00:00

abstract：:Analysis of 24 h urine samples of rats administered N-nitrosodipropylamine (NDPA), N-nitroso-2-hydroxypropylpropylamine (NHPPA) or N-nitroso-2-oxopropylpropylamine (NOPPA) showed that the major excretion product in each case was the beta-glucuronide of NHPPA. This conjugate was shown to be present at levels of about 5...

journal_title：Carcinogenesis

authors： Leung KH,Archer MC

更新日期：1981-01-01 00:00:00

abstract：:Dose response studies regarding the cancer initiating potential of fumonisin B1 (FB1) were conducted as a function of time. Feeding studies over 21 days indicated that FB1 induced a feed refusal effect in rats at dietary levels of 250, 500 and 750 mg FB1/kg diet. This effect was overcome after 14 days and the feed int...

journal_title：Carcinogenesis

authors： Gelderblom WC,Cawood ME,Snyman SD,Marasas WF

更新日期：1994-02-01 00:00:00

abstract：:The genotoxicity of 2-nitropropane (2-NP) and 1-nitropropane (1-NP) was investigated by measuring the induction of DNA repair synthesis in rat liver cells in vitro and in vivo. 2-NP strongly induced DNA repair synthesis in both cases. When applied in vivo, 2-NP was considerably more effective in hepatocytes from males...

journal_title：Carcinogenesis

authors： Andrae U,Homfeldt H,Vogl L,Lichtmannegger J,Summer KH

更新日期：1988-05-01 00:00:00

abstract：:Recent studies indicate that cytochrome P450 (P450) 3A4 plays important roles in the activation of procarcinogens such as aflatoxin B1 and sterigmatocystin, as well as in the oxidation of a number of structurally diverse chemicals and endogenous compounds. Since P450 3A5 has been reported to be present at significant ...

journal_title：Carcinogenesis

authors： Yamazaki H,Inui Y,Wrighton SA,Guengerich FP,Shimada T

更新日期：1995-09-01 00:00:00