abstract：:Several species of columnar cacti in the Sonoran Desert contain isoquinoline alkaloids that are toxic to all but the resident drosophilids that feed and breed in necrotic stems. Cytochrome P450 enzymes are known to be involved in the metabolic detoxification of these alkaloids by the desert Drosophila and are conseque...

journal_title：Chemico-biological interactions

authors： Fogleman JC

更新日期：2000-03-01 00:00:00

abstract：:Copper (Cu) accumulating in a form bound to metallothionein (MT) in the liver of Long-Evans rats with a cinnamon-like coat color (LEC rats), an animal model of Wilson disease, was removed with ammonium tetrathiomolybdate (TTM), and the fate of the Cu complexed with TTM and mobilized from the liver was determined. TTM ...

journal_title：Chemico-biological interactions

authors： Komatsu Y,Sadakata I,Ogra Y,Suzuki KT

更新日期：2000-02-01 00:00:00

abstract：:Chondroitin sulfate (CS), a highly anionic polymer and the most predominant sulfated glycosaminoglycan in connective tissues, was investigated regarding to its interaction with cationic disinfectants, which are used as antiinfectives in humans. Combinations of cetylpyridiniumchloride (CPC), chlorhexidine (CHex), and p...

journal_title：Chemico-biological interactions

authors： Müller G,Kramer A

更新日期：2000-01-15 00:00:00

abstract：:Flavonls are natural compounds present in edible plants and possess several biological activities that can be useful in drug design. Conversely some of these compounds have been shown to be genotoxic to prokaryotic and eukaryotic cells. In this study we tried to establish the chemical features responsible for the geno...

journal_title：Chemico-biological interactions

authors： Silva ID,Gaspar J,da Costa GG,Rodrigues AS,Laires A,Rueff J

更新日期：2000-01-03 00:00:00

abstract：:It has previously been shown that rats pre-treated with butylated hydroxyanisole (BHA), a well-known inducer of the enzyme DT-diaphorase, are protected against the toxic effects of 2-methyl-1,4-naphthoquinone but are made more susceptible to the harmful action of 2-hydroxy-1,4-naphthoquinone. In the present experiment...

journal_title：Chemico-biological interactions

authors： Munday R,Smith BL,Munday CM

更新日期：1999-12-15 00:00:00

abstract：:The mechanisms by which soybean- and soybean isoflavone-enriched diets inhibit carcinogenesis are not known. We found that the isoflavones genistin and daidzin, and their respective aglucone forms daidzein and genistein, block 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD; dioxin)-induced CYP1A1 enzyme activity. This inhi...

journal_title：Chemico-biological interactions

authors： Shertzer HG,Puga A,Chang C,Smith P,Nebert DW,Setchell KD,Dalton TP

更新日期：1999-11-15 00:00:00

abstract：:P-glycoprotein (P-gp) is a membranous ATPase responsible for the multidrug resistance phenotype. The effect on P-gp-mediated transport of anthracyclines of cell irradiation in the presence of 2,2-diphenyl-5-[N-1-(o-azidophenyl)ethylamino]valeronitrile (VP*), a photoactivable analogue of verapamil was studied in viable...

journal_title：Chemico-biological interactions

authors： Mankhetkorn S,Teodori E,Garnier-Suillerot A

更新日期：1999-07-01 00:00:00

abstract：:Our laboratory has been routinely using suspended and cultured human hepatocytes for predicting drug metabolism and enzyme induction by drug candidates to aid drug discovery. Increasing limitation and irregular availability of human tissue has indicated the need for maximizing the use of this valuable resource. Cryopr...

journal_title：Chemico-biological interactions

authors： Silva JM,Day SH,Nicoll-Griffith DA

更新日期：1999-06-01 00:00:00

abstract：:Human serum paraoxonase/arylesterase (PON1, EC 3.1.8.1.) is a calcium-dependent enzyme which hydrolyzes a wide variety of organophosphates, including paraoxon, DFP, sarin and soman. Although the 3-D structure of PON has not yet been determined and its sequence shows no similarity with any other crystallized proteins, ...

journal_title：Chemico-biological interactions

authors： Josse D,Xie W,Masson P,Lockridge O

更新日期：1999-05-14 00:00:00

abstract：:Catalysed hydrolysis of butyrylthiocholine (BTCh) by the usual (UU), fluoride-resistant (FS), AK, AJ and atypical (AA) human serum butyrylcholinesterase (EC 3.1.1.8) variants was measured in phosphate buffer pH 7.4 at 25 degrees C. pS-curves for all phenotypes were S-shaped; the activities rose to a plateau with incre...

journal_title：Chemico-biological interactions

authors： Simeon-Rudolf V,Reiner E,Evans RT,George PM,Potter HC

更新日期：1999-05-14 00:00:00

abstract：:The present study shows the existence of both Ca2+-dependent and EDTA-resistant hydrolysing activities against HDCP and paraoxon in the particulate and soluble fractions of hen, rat and rabbit liver. HDCP was more extensively hydrolysed than paraoxon in both subcellular fractions and each of three individuals of the t...

journal_title：Chemico-biological interactions

authors： Monroy-Noyola A,Sogorb MA,Díaz-Alejo N,Níguez N,Barril J,Vicedo JL,Escudero MA,Vilanova E

更新日期：1999-05-14 00:00:00

abstract：:Mammalian organisms possess two cholinesterases: acetylcholinesterase (AChE, EC 3.1.1.7.) and butyrylcholinesterase (BuChE, EC 3.1.1.8.). A clear explanation for this dual expression of acetylcholine-hydrolyzing enzymes is still missing. Better knowledge on how these two enzymes respond to various physiological or pha...

journal_title：Chemico-biological interactions

authors： Weber U,Brank M,Grubic Z

更新日期：1999-05-14 00:00:00

abstract：:In human populations, serum paraoxonase (PON1) exhibits a substrate dependent polymorphism. The Arg192 isoform hydrolyzes paraoxon rapidly but diazoxon, soman and especially sarin slowly. On the other hand, the Gln192 isoform hydrolyzes paraoxon slowly, but diazoxon, soman and sarin more rapidly than the Arg192 isofor...

journal_title：Chemico-biological interactions

authors： Costa LG,Li WF,Richter RJ,Shih DM,Lusis A,Furlong CE

更新日期：1999-05-14 00:00:00

abstract：:Covalent modification of NTE, a neuronal protein with serine esterase activity, by certain organophosphates (OP) initiates degeneration of long axons in the peripheral and central nervous system. Simple inhibition of NTE esterase activity does not initiate neuropathy; the latter requires aging of the OP bound to the c...

journal_title：Chemico-biological interactions

authors： Glynn P,Read DJ,Lush MJ,Li Y,Atkins J

更新日期：1999-05-14 00:00:00

abstract：:Metabolism of the tobacco specific nitrosamine 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) in rats was compared to metabolism in primary lung and liver cells. Untreated rats and rats pretreated with phenobarbital, acetone or phenethyl isothiocyanate (PEITC) were used for all experiments. Also the influence of...

journal_title：Chemico-biological interactions

authors： Schneider T,Frei E,Wiessler M

更新日期：1999-04-15 00:00:00

abstract：:It was aimed to identify the cytochrome(s) P450 (CYPs) involved in the N-demethylation and N-oxidation of clozapine (CLZ) by various approaches using human liver microsomes or microsomes from human B-lymphoblastoid cell lines. The maximum rates of formation were measured in the microsomal fraction of human livers and ...

journal_title：Chemico-biological interactions

authors： Tugnait M,Hawes EM,McKay G,Eichelbaum M,Midha KK

更新日期：1999-04-01 00:00:00

abstract：:A new analysis of the quantitative structure-activity relationship (QSAR) of the antitumor activity of anilinoacridines against L1210 leukemia in mice and mouse toxicity is reported. QSAR have also been derived for the inhibitory activity of the anilinoacridines with tumor cells and their binding to DNA. These results...

journal_title：Chemico-biological interactions

authors： Gao H,Denny WA,Garg R,Hansch C

更新日期：1998-11-27 00:00:00

abstract：:The mechanism of mitochondrial dysfunction and toxicity induced by the tropolones, beta-thujaplicin (4-isopropyl tropolone), tropolone and tropone, has been studied in freshly isolated rat hepatocytes. Incubation of hepatocytes with beta-thujaplicin (1-4 mM) elicited a concentration and time-dependent cell killing. Th...

journal_title：Chemico-biological interactions

authors： Nakagawa Y,Tayama K

更新日期：1998-11-06 00:00:00

abstract：:Several two-electron quinone reductases catalyze the redox cycling of polycyclic aromatic hydrocarbon (PAH) o-quinones. When the carbonyl reductase of human placenta catalyzes the cycling of 9,10-phenanthrenequinone in aqueous phosphate buffer, reactive oxygen species are produced. Superoxide dismutase (SOD) inhibits ...

journal_title：Chemico-biological interactions

authors： Jarabak R,Harvey RG,Jarabak J

更新日期：1998-10-02 00:00:00

abstract：:Methylglyoxal (2-oxopropanal) is a cytotoxic compound that can be formed endogenously as a by-product of glycolytic pathway; so its concentration is expected to increase when glycolysis activity increases such as during embryo development. In this work we study the effect of exogenous methylglyoxal on development and ...

journal_title：Chemico-biological interactions

authors： Amicarelli F,Bonfigli A,Colafarina S,Bucciarelli T,Principato G,Ragnelli AM,Di Ilio C,Miranda M

更新日期：1998-07-24 00:00:00

abstract：:A series of prenylated xanthones are variously potent inhibitors of the catalytic subunit (cAK) of rat liver cyclic AMP-dependent protein kinase (PKA), rat brain Ca2+ and phospholipid-dependent protein kinase C (PKC), chicken gizzard myosin light chain kinase (MLCK), wheat embryo Ca2+-dependent protein kinase (CDPK) a...

journal_title：Chemico-biological interactions

authors： Lu ZX,Hasmeda M,Mahabusarakam W,Ternai B,Ternai PC,Polya GM

更新日期：1998-07-03 00:00:00

abstract：:The metabolism of radiolabelled benz(j)aceanthrylene (B(j)A) was studied by high performance liquid chromatography (HPLC) using suspensions of hepatocytes and liver microsomes from control- or Aroclor 1254 (PCB)-treated rats, or with human liver microsomes (five different donors) as activation systems. The major metab...

journal_title：Chemico-biological interactions

authors： Johnsen NM,Nyholm SH,Haug K,Scholz T,Holme JA

更新日期：1998-06-05 00:00:00

abstract：:Thioredoxin is a redox protein found over-expressed in some human tumors. Thioredoxin is secreted by tumor cells and stimulates cancer cell growth. Redox activity is essential for growth stimulation by thioredoxin. Cells transfected with thioredoxin cDNA show increased tumor growth and decreased apoptosis in vivo and ...

journal_title：Chemico-biological interactions

authors： Powis G,Kirkpatrick DL,Angulo M,Baker A

更新日期：1998-04-24 00:00:00

abstract：:The glyoxalase system is a metabolic pathway that catalyses the detoxification of alpha-oxoaldehydes RCOCHO to corresponding aldonic acids RCH(OH)CO2H. It thereby protects cells from alpha-oxoaldehyde-mediated formation of advanced glycation endproducts (AGEs). It is comprised of two enzymes, glyoxalase I and glyoxala...

journal_title：Chemico-biological interactions

authors： Thornalley PJ

更新日期：1998-04-24 00:00:00

abstract：:Notwithstanding ongoing progress in anticancer therapeutics development, the persistent problem remains to selectively target tumors while sparing normal tissues. This is confounding largely because the differences between normal and tumor cells are often subtle and part of a gradient, where a gene product may be more...

journal_title：Chemico-biological interactions

authors： Chen X,Carystinos GD,Batist G

更新日期：1998-04-24 00:00:00

abstract：:Sulfation and sulfate conjugate hydrolysis play an important role in metabolism, and are catalysed by members of the sulfotransferase and sulfatase enzyme super-families. In general, sulfation is a deactivating, detoxication pathway, but for some chemicals the sulfate conjugates are much more reactive than the parent ...

journal_title：Chemico-biological interactions

authors： Coughtrie MW,Sharp S,Maxwell K,Innes NP

更新日期：1998-02-20 00:00:00

abstract：:Known spectroscopic and kinetic data are used to formulate pathways of the physiological and transfer reactions and the substrate inhibition of phenol sulfotransferase. Kinetic mechanisms indicate that release of PAP from enzyme complex is required for the physiological reaction but not for the transfer reaction. The ...

journal_title：Chemico-biological interactions

authors： Yang YS,Tsai SW,Lin ES

更新日期：1998-02-20 00:00:00

abstract：:In the present study, we examined the effects of hemin on the mutagenicity of 6-sulfooxymethylbenzo[a]pyrene (SMBP) in Salmonella typhimurium TA98 and Chinese hamster lung fibroblast (V79) cells. The compound was tested for the possible chemoprotective activity against mutagenesis induced by SMBP and its precursor, 6-...

journal_title：Chemico-biological interactions

authors： Hong ST,Cho YS,Surh YJ,Chung AS

更新日期：1998-02-20 00:00:00

abstract：:Acetaldehyde (AA) and methylglyoxal (MG) are reactive, ubiquitous aldehydes, present in the environment and endogenously formed in animals and humans. They have both been shown to readily form DNA adducts under simulated physiological conditions. We report here on the use of cultured normal and SV40T antigen-immortali...

journal_title：Chemico-biological interactions

authors： Vaca CE,Nilsson JA,Fang JL,Grafström RC

更新日期：1998-01-30 00:00:00

abstract：:The mutagenicity of many 2-aminoimidazole-azaarenes (AIA) is thought to be mediated by the nitrenium form of the exocyclic amine. This hypothesis is supported by the numerous correlations found between calculated and experimentally-measured chemical properties for the nitreniums and the mutagenic potencies of the nitr...

journal_title：Chemico-biological interactions

authors： Colvin ME,Seidl ET,Nielsen IM,Le Bui L,Hatch FT

更新日期：1997-12-12 00:00:00

abstract：:Treatment of animals with hydrazine causes the accumulation of triglycerides in the liver but the mechanism remains unclear. Therefore, the effect of hydrazine on hepatic triglyceride synthesis and subsequent transport was studied in a hepatocyte model, in vitro in order to isolate liver cells from extrahepatic influe...

journal_title：Chemico-biological interactions

authors： Waterfield CJ,Asker DS,Timbrell JA

更新日期：1997-11-28 00:00:00

abstract：:The ability of pantoprazole to affect the induction of cytochrome P450 (CYP) 1A subfamily was evaluated and compared with two other proton pump inhibitors, omeprazole and lansoprazole, in primary cultured hepatocytes from female Sprague-Dawley rats. The hepatocytes were cultured for 2 days, followed by treatment for 2...

journal_title：Chemico-biological interactions

authors： Masubuchi N,Okazaki O

更新日期：1997-11-06 00:00:00

abstract：:Tamoxifen, widely used as adjuvant therapy in the treatment of breast cancer, is now undergoing trials as a cancer chemopreventative agent. Previous work has shown an association between 32P-postlabelled adducts in rat liver DNA and the development of liver tumours. With the use of accelerator mass spectrometry, [14C]...

journal_title：Chemico-biological interactions

authors： White IN,Martin EA,Mauthe RJ,Vogel JS,Turteltaub KW,Smith LL

更新日期：1997-09-12 00:00:00

abstract：:The objectives of the present work were to study the effects of certain peroxisome proliferators on xenobiotic-metabolizing enzyme activities in the testes of normal and hypothyroid rats, i.e. phenol sulfotransferases (pST), phenol UDP-glucuronosyl transferases (pUDPGT), glutathione transferases (GST), catalase, epoxi...

journal_title：Chemico-biological interactions

authors： Mehrotra K,Morgenstern R,Lundqvist G,Becedas L,Bengtsson Ahlberg M,Georgellis A

更新日期：1997-05-02 00:00:00

abstract：:The results demonstrate different modes of action by a dioxin-like polychlorinated biphenyl (PCB 126) and a non dioxin-like PCB (PCB 153) in the alteration of connexin (cx) 26 and cx 32 expression outside GST-P positive foci in liver of female Sprague-Dawley rats, treated according to an initiation-promotion protocol....

journal_title：Chemico-biological interactions

authors： Bager Y,Kato Y,Kenne K,Wärngård L

更新日期：1997-03-14 00:00:00

abstract：:The mechanisms by which brassica vegetables might decrease the risk of cancer are reviewed in this paper. Brassicas, including all types of cabbages, broccoli, cauliflower and Brussels sprouts, may be protective against cancer due to their relatively high glucosinolate content. Glucosinolates are usually broken down t...

journal_title：Chemico-biological interactions

authors： Verhoeven DT,Verhagen H,Goldbohm RA,van den Brandt PA,van Poppel G

更新日期：1997-02-28 00:00:00

abstract：:Glycidyl ethers are used in epoxy resins. Epoxy resins are widely used in adhesives and coatings, as well as in electronics and structural composites, thus there is a potential of human exposure to glycidyl ethers. The aim of the present investigation was to explore the utility of haemoglobin adducts for biomonitoring...

journal_title：Chemico-biological interactions

authors： Pérez HL,Plná K,Osterman-Golkar S

更新日期：1997-01-24 00:00:00

abstract：:Inhibition of microtubule assembly by arenastatin A (1) and five synthetic analogs (3-7) was examined. Arenastatin A and the triamide 6 showed potent and moderately strong inhibitory activities, respectively (IC50; 2.3 microM for 1, 7.8 microM for 6) and also depolymerized preformed microtubules. The other analogs tes...

journal_title：Chemico-biological interactions

authors： Koiso Y,Morita K,Kobayashi M,Wang W,Ohyabu N,Iwasaki S

更新日期：1996-12-20 00:00:00

abstract：:Oxidative stress is a cellular or physiological condition of elevated concentrations of reactive oxygen species that cause molecular damage to vital structures and functions. Several factors influence the susceptibility to oxidative stress by affecting the antioxidant status or free oxygen radical generation. Here, we...

journal_title：Chemico-biological interactions

authors： Møller P,Wallin H,Knudsen LE

更新日期：1996-09-27 00:00:00

abstract：:Bitumens contain traces of polycyclic aromatic compounds (PACs), a part of which will end up in the fumes emitted during hot handling of bitumen-containing products, e.g. during roadpaving. Although exposure of workers to these fumes is low, it might lead to health problems. Studies on bitumen fume condensates (BFCs) ...

journal_title：Chemico-biological interactions

authors： De Méo M,Genevois C,Brandt H,Laget M,Bartsch H,Castegnaro M

更新日期：1996-08-14 00:00:00