Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous environmental contaminants generated as byproducts of natural and anthropogenic combustion processes. Despite significant public health concern, physiologically based pharmacokinetic (PBPK) modeling efforts for PAHs have so far been limited to naphthalene, plus simpler PK models for pyrene, nitropyrene, and benzo[a]pyrene (B[a]P). The dearth of...
Zebrafish (Danio rerio) are one of the most commonly used animal models in biomedical research. Zebrafish resource facilities, like the Zebrafish International Resource Center (ZIRC) in Eugene, Oregon, are the main providers and keepers of numerous zebrafish wild-type, mutant, and transgenic lines. Although ZIRC maintains live zebrafish at various life...
Dibenzo(def,p)chrysene (DBC), (also known as dibenzo[a,l]pyrene), is a high molecular weight
polycyclic aromatic hydrocarbon (PAH) found in the environment, including food, produced by
the incomplete combustion of hydrocarbons. DBC, classified by IARC as a 2A probable human
carcinogen, has a relative potency factor (RPF) in animal cancer models 30-fold higher...
Full Text:
, S. G., Anderson, K. A., Krishnegowda, G.,
Sharma, A. K., Soelberg, J. J., Williams, D. E., and
Dibenzo(def,p)chrysene (DBC), (also known as dibenzo[a,l]pyrene), is a high molecular weight
polycyclic aromatic hydrocarbon (PAH) found in the environment, including food, produced by
the incomplete combustion of hydrocarbons. DBC, classified by IARC as a 2A probable human
carcinogen, has a relative potency factor (RPF) in animal cancer models 30-fold higher...
Full Text:
Mike Malfattiǂ, Tammie J. McQuistan┴, Mary Garrard‡,┴,₤, Dan Sudakin†,‡,₤ and David E. 5
Williams
Dibenzo[def,p]chrysene (DBC) is a transplacental carcinogen in mice (15 mg/kg; gestation day (GD) 17). To mimic residual exposure throughout pregnancy, dams received 4 smaller doses of DBC (3.75 mg/kg) on GD 5, 9, 13 and 17. This regimen alleviated the previously established carcinogenic responses in the thymus, lung, and liver....
FVB/N mice wild-type, heterozygous or null for Cyp 1b1 were used in a two-stage skin tumor study comparing PAH, benzo[a]pyrene (BaP), dibenzo[def,p]chrysene (DBC), and coal tar extract (CTE, SRM 1597a). Following 20 weeks of promotion with TPA the Cyp 1b1 null mice, initiated with DBC, exhibited reductions in incidence, multiplicity,...
The primary objective of this study was to identify, and to
group, the professional education competencies common to administrators
of vocational education. The technique of factor analysis was
used to form logical groups of competencies. The secondary objectives
were to:
1. determine, by the method of the analysis of variance,...