Metabolism of benzo(a)pyrene (BaP) in vivo and in vitro was studied using two benthic fish species, English sole (Parophrys vetulus) and starry flounder (Platichthys stellatus), and Sprague-Dawley rats. At 24 h after administration of BaP (7.9 mumol/kg of body weight) to fish either p.o. (Experiment 1) or i.p. (Experiment 2), the specific activity of binding of BaP metabolites to hepatic DNA (p...

We developed a gas chromatography-isotope dilution high-resolution mass spectrometry (GC-ID-HRMS) method for quantifying isomers of benzo[a]pyrene (BaP) tetrol metabolites resulting from hydrolysis of benzo[a]pyrene-diol-epoxide hemoglobin (BaPDE-Hb) adducts. Acid hydrolysis of BPDE-Hb adducts extracted from human blood samples yielded isomers of benzo[a]pyrene-tetrahydrotetrols, (+/-)-BaP-r-7,...

UDP-glucuronosyltransferase 1A10 (UGT1A10) is an extrahepatic enzyme expressed in aerodigestive tract tissues that exhibits significant glucuronidation activity against the important procarcinogenic benzo(a)pyrene (BaP) metabolite, BaP-trans-7,8-dihydrodiol (BPD), and the UGT1A10 codon 139 (Glu>Lys) polymorphism was previously implicated in risk for orolaryngeal cancer by Elahi et al. in their ...

Benzopyrene (BaP) is polycyclic aromatic hydrocarbon (PAH), and is chemically modified in the animal body to form a number of metabolites that may elicit a various toxicity. However, the effect of BaP on neuroblastoma differentiation has remained unclear. We have studied the effect of BaP on neurite outgrowth using human SH-SY5Y neuroblastoma cells induced to differentiate by all-trans-retinoic...

This study surveyed a rapid, efficient and reproducible protocol for in vitro shoot regeneration and rooting by different explants and different concentration of BAP. Due to optimization of shoot regeneration, two media including of MS and modified MS (MS salts with double concentration of CaC21, and B5 vitamins), different explants such as decapitated embryo axes, epicotyls and cotyledonary no...

A modifying influence of ortho-cresol (o-cresol) on the carcinogenic effect of benzo(a)pyrene (BaP) with combined oral administration to CC57Br mice had been found. During simultaneous administration of o-cresol (1 mg) and BaP (1 mg), the incidence of tumors, the multiplicity of tumors, and the degree of malignancy all increased, but the latency was shortened. When o-cresol was administered bef...

UNLABELLED We previously reported that overexpression of catalase upregulated xenobiotic- metabolizing enzyme (XME) expression and diminished benzo(a)pyrene (BaP) intermediate accumulation in mouse aortic endothelial cells (MAECs). Endoplasmic reticulum (ER) is the most active organelle involved in BaP metabolism. To examine the involvement of ER in catalase-induced BaP detoxification, we compa...

Benzo[a]pyrene (BaP), a well-known environmental carcinogen, promotes oxidative stress and DNA damage. Curcumin and vitamin E (VE) have potent antioxidative activity that protects cells from oxidative stress and cellular damage. The objectives of the present study were to investigate the adverse effects of BaP on normal human lung epithelial cells (BEAS-2B), the potential protective effects of ...

Knowledge of the ability of the female reproductive system to metabolize environmental chemicals is critical not only from the standpoint of toxicity but also from infertility risk assessment. Benzo(a)pyrene (BaP) is a toxicant that is released into the environment from automobile exhausts, cigarette smoke, burning of refuse, industrial emissions, and hazardous waste sites. In exposed animals, ...

Benzo[a]pyrene (BaP) is a human carcinogen that covalently binds to DNA after activation by cytochrome P450 (P450). Here, we investigated whether NADH:cytochrome b5 reductase (CBR) in the presence of cytochrome b5 can act as sole electron donor to human P450 1A1 during BaP oxidation and replace the canonical NADPH:cytochrome P450 reductase (POR) system. We also studied the efficiencies of the c...