Stereoselective metabolism of dibenzo[a,l]pyrene (DB[a,l]P), 2-chlorodibenzo[a,l]pyrene (2-Cl-DB[a,l]P) and 10-chlorodibenzo[a,l]pyrene (10-Cl-DB[a,l]P) by rat liver microsomes was studied and effects of the chloro substituent on the metabolism were determined. All three compounds produced trans-8,9-dihydrodiol, trans-11,12-dihydrodiol, and the 7-hydroxyl derivative as major metabolic products and several other phenolic derivatives as minor metabolites. The trans-8,9- and 11,12-dihydrodiols of DB[a,l]P and 2-Cl-DB[a,l]P preferentially adopted a quasidiequatorial conformation, whereas 10-Cl-DB[a,l]P trans-8,9- and 11,12-dihydrodiols preferentially adopted a quasidiaxial conformation. The yields of the trans-11,12-dihydrodiol metabolites are: DB[a,l]P trans-11,12-dihydrodiol | 2-Cl-DB[a,l]P trans-11,12-dihydrodiol || 10-Cl-DB[a,l]P trans-11,12-dihydrodiol. Circular dichroism (CD) spectral analysis indicates that the trans-8,9-dihydrodiol and trans-11,12-dihydrodiol metabolites from DB[a,l]P, 2-Cl-DB[a,l]P
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Siddens LK, Larin A, Krueger SK, Bradfield CA, Waters KM, Tilton SC, Pereira CB, Lohr CV, Arlt VM, Phillips DH, Williams DE and Baird WM (2012). Polycyclic aromatic hydrocarbons as skin carcinogens: Comparison of benzo[a]pyrene, dibenzo[def,p]chrysene and three environmental mixtures in the FVB/N mouse. Toxicology and Applied Pharmacology doi: 10.1016/j.taap.2012.08. ...
In dwellings and similar spaces with limited volume, dilution of indoor air contaminants may be insufficient. The concentration of contaminants in the inside air depends partly on the rate of emission into the room, partly on the ventilation and the concentration of impurities in the outside air. Sulphur dioxide, hydrocarbons, ozone and lead compounds occur in higher concentrations in the outside air, whereas nitrogen oxides, carbon monoxide, benzpyrene (from tobacco smoke), formaldehyde and dust have higher concentrations indoors. ...
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70133-84-5 - JZLWANHLFXZFCU-UHFFFAOYSA-N - 2-Chloro-12-(2-piperidinoethyl)dibenzo(d,g)-1,3,6-dioxazocine - Similar structures search, synonyms, formulas, resource links, and other chemical information.
Pyrene derivatives can be carcinogenic, teratogenic and mutagenic, thus having the potential to cause malignant diseases. In this work, the interactions of two selected pyrene derivatives (1-OHP and 1-PBO) and human tumor-related DNA (p53 DNA and C-myc DNA) are investigated by spectroscopic and non-native polyacrylamide gel electrophoresis (PAGE) methods. Using fluorescence spectrometry and circular dichroism (CD), DNA interactions of pyrene derivatives are confirmed to occur mainly via the groove binding mode supported by the intercalation into the base pairs of DNA. There is an obvious binding order of pyrene derivatives to the targeted DNA, 1-OHP | 1-PBO. The binding constants of 1-OHP are 1.16 × 106 L×mol−1 and 4.04 × 105 L×mol−1 for p53 DNA and C-myc DNA, respectively, while that of 1-PBO are only 2.04 × 103 L×mol−1 and 1.39 × 103 L×mol−1 for p53 DNA and C-myc DNA, respectively. Besides, the binding of pyrene derivatives to p53 DNA is stronger than that for C-myc DNA. CD and PAGE
TY - JOUR. T1 - Binding of isomers of benzo[a]pyrene diol-epoxide to chromatin. AU - Kootstra, A.. AU - Slaga, T. J.. PY - 1980/4/14. Y1 - 1980/4/14. N2 - Both the carcinogenic B[a]P diol-epoxide (anti) and its relatively noncarcinogenic isomer, B[a]P diol-epoxide (syn), when reacted with chromatin in vitro, bind more extensively to the internucleosomal region of chromatin than to nucleosomes. These results suggest that the increased binding of B[a]P diol-epoxide (anti) to the internucleosomal region may have little relevance to the process of carcinogenesis.. AB - Both the carcinogenic B[a]P diol-epoxide (anti) and its relatively noncarcinogenic isomer, B[a]P diol-epoxide (syn), when reacted with chromatin in vitro, bind more extensively to the internucleosomal region of chromatin than to nucleosomes. These results suggest that the increased binding of B[a]P diol-epoxide (anti) to the internucleosomal region may have little relevance to the process of carcinogenesis.. UR - ...
When [3H]benzo[a]pyrene is incubated in vitro together with deproteinized salmon sperm DNA, NADPH, and mouse liver microsomes, the covalent binding of benzo[a]pyrene metabolites to DNA occurs. The metabolite-nucleoside complexes can be resolved into at least nine distinct peaks by elution of a Sephadex LH-20 column with a water-methanol gradient. These peaks are arbitrarily designated A (most polar) through I (least polar). With the use of synthetic and biologically produced metabolites, seven of nine peaks are tentatively assigned to one or more metabolites of benzo[a]pyrene. Peaks A and C are unidentified. Peaks B, D, F, and I include products of benzo[a]pyrene quinones that are further metabolized. Peak E reflects almost exclusively both the cis- and trans-7,8-diol 9,10-epoxides of benzo[a]pyrene. Peak G represents predominantly the K-region metabolite (the 4,5-oxide), interacting with one or more nucleosides. Peak H comprises reactive intermediates resulting from the further metabolism of ...
Butylated hydroxyanisole (BHA) is a commonly used food additive with demonstrated inhibitory action against chemical carcinogenesis in animals. In order to elucidate the mechanism of the anticarcinogenic action, the effects of BHA on benzo(a)pyrene (BP) metabolism were studied with lung microsomes from female mice. BHA treatment (0.5% in the diet for 7 days) inhibited BP metabolism and altered the ratios among different metabolites as analyzed by high-performance liquid chromatography. The treatment reduced the metabolic formation of 9,10-dihydroxy-9,10-dihydrobenzo(a)pyrene, but not the production of 3-hydroxybenzo(a)pyrene and trans-4,5-dihydroxy-4,5-dihydrobenzo(a)pyrene. Since the gross microsomal cytochrome P-450 content was not significantly affected by the treatment, the change of regioselectivity in BP metabolism was probably due to the alteration of cytochrome P-450 isozyme composition by dietary BHA. General and regioselective inhibition of BP metabolism was also observed when BHA was ...
Advertisement In utero Exposure of Mice to Dibenzo[a,l]Pyrene Produces Lymphoma in the Offspring: Role of the Aryl Hydrocarbon Receptor
Levin, W; Wood, A W.; Wislocki, P G.; Kapitulnik, J; Yagi, H; Jerina, D M.; and Conney, A H., "Carcinogenicity of benzo-ring derivatives of benzo(a)pyrene on mouse skin." (1977). Subject Strain Bibliography 1977. 715 ...
An enzyme immunoassay for the detection of benzo[a]pyrene covalently conjugated to macromolecules has been developed. The monoclonal antibody, raised through in vitro immunization reacted with benzo[a]pyrene metabolites bound to DNA, RNA and proteins. The lower detection limit for the assay was 1 pmol for benzo[a]pyrene bound to DNA or RNA, and 5 pmol when bound to protein.
CAS NO:192-97-2; Chemical name:benzo[e]pyrene ; physical and chemical property of 192-97-2, benzo[e]pyrene is provided by ChemNet.com
4.1 Polymorphisms and mutations are both variations in DNA sequence and can arise through the same mechanisms. We use the term polymorphism to refer to DNA variants that are relatively common in populations. Mutations affect the phenotype.. 4.2 Misreading of bases during replication can lead to substitution and can be caused by things like tautomerism, DNA alkylating agents, and irradiation.. 4.3 Looping out of DNA on the template strand during replication; strand breakage, due to radiation and other mutagens; and (discussed in earlier chapters) chromosomal aberrations such as deletions and translocations.. 4.4 Looping out of DNA on the growing strand during replication; transposition; and (discussed in earlier chapters) chromosomal aberrations such as duplications, insertions, and translocation.. 4.5 Benzopyrene is one of many hazardous compounds present in smoke. Benzopyrene is an intercalating agent, which slides between the bases of the DNA molecule, distorting the shape of the double helix, ...
You are viewing an interactive 3D depiction of the molecule 9-(2-deoxy-5-o-phosphonopentofuranosyl)-n-(7,8,9-trihydroxy-7,8,9,10-tetrahydrobenzo[pqr]tetraphen-10-yl)-9h-purin-6-amine (C30H14N5O9P) from the PQR.
Creative-Proteomics offer cas 192-65-4 DIBENZO[A,E]PYRENE UNLABELED. We are specialized in manufacturing Stabel Isotope Labeled Analytical Standard products.
The present study shows the effect of combined dietary deprivation of fat and vitamin A on benzo(a)pyrene (BaP) induced lung carcinogenesis in male Wistar rats. Lung tumors were induced by intratracheal instillation of BaP-Fe2O3 in normal saline. The tumor incidence and tumor burden in control animals were 82% and 2.28 respectively. Fat deficiency decreased the tumor incidence to 57% and tumor burden to 1.66. On the other hand, in vitamin A deficiency these were 83% and 4.02 respectively. Fat deprivation in the diet of animals fed with vitamin A deficient diet decreased the tumor incidence and tumor burden to 69.6% and 2.7 respectively. The results suggest a protective role of low intake of fat in vitamin A deficiency for BaP-induced lung tumorigenesis in rats.
Zaleski, J; Bansal, S K.; and Gessner, T, "Formation of glucuronide, sulphate and glutathione conjugates of benzo[a]pyrene metabolites in hepatocytes isolated from inbred strains of mice." (1983). Subject Strain Bibliography 1983. 1888 ...
Dibenzo[b,e]Thiepin-11(6H)-One 1531-77-7 MSDS report, Dibenzo[b,e]Thiepin-11(6H)-One MSDS safety technical specifications search, Dibenzo[b,e]Thiepin-11(6H)-One safety information specifications ect.
6-methoxy-1,5-dihydrobenzo[cd]indol-4(3H)-one - chemical structural formula, chemical names, chemical properties, synthesis references
Phenylethynylpyrene (PEP) is a pyrene derivative with red-shifted absorption and emission spectra. Fits blue channel of qPCR instruments, can be used for multiplex experiments.
Trichloroepoxypropane: A potent epoxide hydrase and aryl hydrocarbon hydroxylase inhibitor. It enhances the tumor-initiating ability of certain carcinogens.
dibenzo[b,d]furan-2-carbaldehyde | C13H8O2 | CID 220843 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.
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E er karaci er absesi bakteriden kaynaklan yorsa, doktor ak t l p temizlenmesi i in kateterizasyon ve be hafta damardan antibiyotik verilmesini nerebilir. Bazen cerrahi m dahal
Aryl hydrocarbon hydroxylase (AHH) was induced 15-fold in Ambystoma tigrinum by intraperitoneal injection of 3-methylcholanthrene in corn oil, or 10-fold by addition of aromatic polycyclic hydrocarbons to the aqueous environment of the neotene animal. The cytochrome P-450-associated microsomal enzyme is similar to the inducible, one-gene, autosomal-dominant system typical in the laboratory mouse and man. Differences in optimal temperature for enzyme induction and activity were noted in organ culture of human and Ambystoma tissues, and ratios of benzpyrene metabolites differed between Ambystoma and Mus. The half life of enzyme activity induced in vivo was related to the excretion of hydrocarbon metabolites.
Effects of five organic solvent vehicles on benzo(a)pyrene- hydroxylase (BP-hydroxylase) activity and on the benzo(a)pyrene (50328) (BP) metabolite profile were studied in lung microsomes prepared from male New Zealand white rabbits. The production of 3- OH-benzo(a)pyrene (13345216) and 9-OH-benzo(a)pyrene (17573216) was used to evaluate the effects of dimethyl-sulfoxide (DMSO), acetone, methanol,
Two diol-epoxide metabolites of benzo[c]phenanthrene and benzo[a]pyrene, polynuclear aromatic hydrocarbons which occur in the environment, were tested for carcinogenicity by direct injection into the mammary fat pads of female CD rats. The compounds anti-3,4-dihydroxy-1,2-epoxy-1,2,3,4-tetrahydrobenzo[c]phenanthrene (BcPDE), a fjord region diol-epoxide, and anti-7,8-dihydroxy-9,10-epoxy-7,8,9,10-tetrahydrobenzo[a]pyrene, a bay region diol-epoxide, were applied at total doses of 12.2 µmol. 6-Nitrochrysene was applied at the same dose as a positive control (K. El-Bayoumy, A. Rivenson, P. Upadhyaya, Y-H. Chae, and S. S. Hecht, Cancer Res. 53: 3719-3722, 1993). The sterically hindered fjord region diol-epoxide BcPDE was a powerful mammary tumorigen and carcinogen, rapidly inducing significantly more fibroadenoma and adenocarcinoma than either of the other compounds. Anti-7,8-dihydroxy-9,10-epoxy-7,8,9,10-tetrahydrobenzo[a]pyrene was a weaker mammary tumorigen than BcPDE and 6-nitrochrysene. The ...
V. J. Melendez-Colon, Smith, C. Allen, Seidel, A., Luch, A., Platt, K. L., and Baird, W. M., "Formation of stable adducts and absence of depurinating DNA adducts in cells and DNA treated with the potent carcinogen dibenzo [a, l] pyrene or its diol epoxides", Proceedings of the National Academy of Sciences, vol. 94, pp. 13542-13547, 1997. ...
6,8-diallyl 5,7-dihydroxy 2-(2-allyl 3-hydroxy 4-methoxyphenyl)1-H benzo(b)pyran-4-one: inhibitor of cell adhesion and atherosclerosis that targets nadph oxidase
136623-01-3 - SCDBMLHUXJBJSS-UHFFFAOYSA-N - 5-Nitro-6,7,8,9-tetrahydrobenzo(G)indole-2,3-dione-3-oxime - Similar structures search, synonyms, formulas, resource links, and other chemical information.
Quinone 유도체들은 항진균, 항암, 항균, 항말라리아 등 다양한 생리활성을 나타낸다. 본 연구에서는 quinone 유도체 중 우수한 생리활성이 예상되는 quinone 유도체를 합성하여 항진균 작용 및 그 생리활성을 검색하였다. 1,4-Naphthoquinone을 ZnCl2를 촉매로 하여 ethyl benzoylacetate와 aryl thiol과 반응시켜 ethyl 5-oxo-2-phenyl-4-(phenylthio)-5,9b-dihydronaphtho[1,2-b]furan-3-carboxylate (NQMSs) 유도체 2개를 합성하였다. 2,3-Dichloro-5-hydroxynaphthalene-1,4-dione은 5-hydroxynaphthalene-1,4-dione를 Cl2 gas 와 반응시켜 합성하였고, 다양한 pyridine derivatives와 active methylene derivatives와 반응시켜 10-hydroxybenzo[f]pyrido[1,2-a]indole-6,11-dione (JQPMs) 유도체 9개를 합성하였다. 또 2,3-dichloro-5-hydroxynaphthalene-1,4-dione과 ethyl cyanoacetate를 반응시키고 다양한 arylamine을 반응시켜 ethyl ...
Chapel Hill, NC 27599-7525. Cells are particularly vulnerable to the cancer causing effects of chemicals if the treatments occur when the cells start to synthesize DNA during the cell growth cycle. Studies are probing the mechanisms that cause this susceptibility including identifying genomic sites replicated early in the DNA synthesis phase. A separate area of study concerns the development of endometrial cancer. Human endometrium has been reconstructed in culture from its constituent cells and interactions between endometrial epithelial and stromal cells determine normal tissue structure and function. The reconstructed endometrium has been used to reproduce progressive steps of endometrial cancer development in translational studies.. Previous studies showed that cells are most susceptible to malignant transformation when they are treated with chemical carcinogens during the earliest part of the S phase. DNA is also preferentially damaged when it replicates, with elevated carcinogen binding to ...
Benzo(a)pyrene-7,8-diol, 6-fluoro-7,8-dihydro- | C20H13FO2 | CID 128565 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.
1JDG: Solution structure of a trans-opened (10S)-dA adduct of (+)-(7S,8R,9S,10R)-7,8-dihydroxy-9,10-epoxy-7,8,9,10-tetrahydrobenzo[a]pyrene in a fully complementary DNA duplex: evidence for a major syn conformation.
Quetiapine EP Impurity C ;. 2-(2-(4-(Dibenzo[b,f][1,4]thiazepin-11-yl)piperazin-1-yl)ethoxy)ethyl 2-(4-(dibenzo[b,f][1,4]thiazepin-11-yl)piperazin-1-yl)acetate ;. CAS # 1798840-31-9 ;. C40H42N6O3S2 ;. MW: 718.93. ...
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this p...
First Quadrant L P CA cut its holdings in Lannett Co Inc (NYSE:LCI) by 23.8% during the 3rd quarter, according to the company in its most recent disclosure with the SEC. The firm owned 15,400 shares of the companys stock after selling 4,800 shares during the quarter. First Quadrant L P CAs holdings in Lannett […]
Brundel, dang, I dont like hearing that about 7, 8 benzoflavone . I was about to pick up several bottles of Dermacrine when they were back in stock.
Upptäck Euro NCAP:s Mercedes Benz C Class 2009 säkerhetsbedömning: detaljerade resultat, bilder, video och kommentarer till krocktest
هدف: اسینتوباکتر بومانی یکی از پاتوژن‏های اصلی بیمارستانی است و ظرفیت بالایی برای مقاومت به انواع مواد ضد میکروبی موجود دارد. اسینتوباکتر بومانی انواع متفاوتی از عفونت‏ها شامل پنومونی، مننژیت و عفونت‏های مرتبط با خون را ایجاد می‏کند. پروتئین‏های مربوط به بیوفیلم (Bap) پروتئینی اختصاصی در سطح سلول است که مستقیماً در تشکیل بیوفیلم در اسینتوباکتر بومانی مورد نیاز است و نقش اصلی را در عفونت‏زایی باکتری بازی می‏کند. در مطالعه قبلی محققان حاضر نواحی متعددی از این پروتئین بررسی شد و با در نظر گرفتن معیارهای مختلف، چند ناحیه به عنوان نواحی حفاظت شده و ایمنی
To investigate the specificity of biological monitoring variables (excretion of phenanthrene and pyrene metabolites in urine) and the usefulness of some biomarkers of effect (alkaline filter elution, {sup}32{end}P postlabeling assay, measurement of sister chromatid exchange)in workers exposed to polycyclic aromatic hydrocarbons (PAHs). 29 coke oven workers and a standardised control group were investigated for frequencies of DNA single strand breakage, DNA protein cross links (alkaline filter elution assay), sister chromatid exchange, and DNA adducts ({sup}32{end}P postlabeling assay) in lymphocytes. Phenanthrene and pyrene metabolites were measured in 24 hour urine samples. 19 different PAHs (including benzo(a)pyrene, pyrene, and phenanthrene) were measured at the workplace by personal air monitoring. The GSTT1 activity in erythrocytes and lymphocyte subpopulations in blood was also measured. Concentrations of phenanthrene, pyrene, and benzo(a)pyrene in air correlated well with the ...
Deuterium isotope effects on 13C-NMR chemical shifts are investigated in a series of 10-hydroxybenzo[h]quinolines (HBQs) The OH proton is deuteriated. The isotope effects on 13C chemical shifts in these hydrogen bonded systems are rather unusual. The formal four-bond effects are found to be negative, indicating transmission via the hydrogen bond. In addition unusual long-range effects are seen. Structures, NMR chemical shifts and changes in nuclear shieldings upon deuteriation are calculated using DFT methods. Two-bond deuterium isotope effects on 13C chemical shifts are correlated with calculated OH stretching frequencies. Isotope effects on chemical shifts are calculated for systems with OH exchanged by OD. Hydrogen bond potentials are discussed. New and more soluble nitro derivatives are synthesized ...
Looking for polycyclic hydrocarbon? Find out information about polycyclic hydrocarbon. polynuclear hydrocarbon Explanation of polycyclic hydrocarbon
Environmental exposure to carcinogens may contribute to increasing breast cancer rates and geographic variation in breast cancer incidence in the United States. One class of chemicals that has received much attention are the polyaromatic hydrocarbons that are ubiquitous in the environment and occur in cigarette smoke. The cytochrome P450 1A1 (CYP1A1) gene codes for an enzyme that contributes to aryl hydrocarbon hydroxylase activity, which is involved in the metabolism of polyaromatic hydrocarbons. Genotypic variants of CYP1A1 have been associated with increased aryl hydrocarbon hydroxylase activity, and some epidemiological studies suggest that women with the variant genotype(s) are at increased risk for breast cancer.. We prospectively evaluated the associations between the CYP1A1 polymorphisms and breast cancer risk, as well as the potential modification of these associations by cigarette smoking, in a case-control study nested within the Nurses Health Study. We analyzed the T→C transition ...
Background Benzo[a]pyrene(B[a]P), and its own greatest metabolite Benzo[a]pyrene 7,8-diol 9,10-epoxide (BPDE), are classic DNA damaging carcinogens. BPDE-DNA adducts. In addition, we found that the combined small alleles of rs3212986 and rs238406 were associated with a reduced DNA restoration capacity. Conclusions Our results claim that the version genotypes of rs3212986 and rs238406 are connected with reduced fix performance of BPDE induced DNA GDC-0973 harm, and may end up being predictive for somebodys DNA fix capability in response to environmental carcinogens. Launch Benzo[a]pyrene(B[a]P) is a vintage DNA harming carcinogen which is normally one of a variety of polycyclic aromatic hydrocarbons(PAHs) typically found in cigarette smoke cigarettes and in the ambient environment [1], [2]. Benzo[a]pyrene 7,8-diol 9,10-epoxide (BPDE), the best metabolite of B[a]P, forms covalent BPDE-DNA adducts within a cell that problems the framework and function of natural macromolecules such as for example ...
The effect of ellagic-acid (476664) on in-vitro metabolism of benzo(a)pyrene (50328) (BaP) or trans-7,8-dihydro-7,8- dihydroxybenzo(a)pyrene (trans BaP) by mouse lung explants was investigated. Explants were cultured for 16 hours in the presence or absence of 10 to 100 micromolar (microM) concentrations of the naturally occuring plant phenol. Ellagic-acid was then removed and explants were incubat
Evaluation of Accelerated Solvent Extraction of deuterated benzo(a)pyrene and dibenzo(a,i)pyrene from Diesel Standard Reference Material 2975 ...
Mice were evaluated for their ability to form phenobarbital N-glucuronides. Following oral administration of [14C]phenobarbital to mice, a radiolabeled phenobarbital metabolite cochromatographed with synthetic standards of phenobarbital N-glucuronides. The phenobarbital N-glucuronides were partially purified from the mouse urine as phenobarbital N-methylglucuronates. The phenobarbital N-methylglucuronates isolated from mouse urine had similar chromatographic and spectroscopic properties as synthetic standards. The diastereomers of phenobarbital N-glucuronides and phenobarbital N-glucosides accounted for 7.8 +/- 2.3% and 1.6 +/- 0.6%, respectively, of the radioactivity excreted in mouse urine in the first 48 hr after dosing. This study indicates that the mouse may be a suitable species to study both N-glucosidation and N-glucuronidation simultaneously as metabolic pathways for barbiturates. ...