Project description:In this study, we compare genomic signature safter treatment ofprimary human bronchial epithelial cells (HBEC) cultured in 3D with polycyclic aromatic hydrocarbons (PAHs) and identify genesets predictive of cancer risk.
Project description:Effect of 5.4 ppm polycyclic aromatic hydrocarbons (PAHs) and 18.2 ppm alkylphenols (APs) on gene expression in adult Zebrafish (Danio rerio) liver after 1 and 7 weeks of water-borne exposure.
Project description:The mechanisms of cardiotoxicity of the three widespread model polycyclic aromatic hydrocarbons (PAHs) retene, pyrene and phenanthrene were explored in rainbow trout (Oncorhyncus mykiss) early life stages. Newly hatched larvae were exposed to sublethal doses of each individual PAH causing no detectable morphometric alterations. Changes in the cardiac proteome were assessed after 7 or 14 days of exposure to each PAH.
Project description:It has been reported that polycyclic aromatic hydrocarbons (PAHs) act on calcified tissue and suppress osteoblastic activity in the scales of teleost fish. In the present study, the differentially-expressed genes in the zebrafish scales treated with benzo[c]phenanthrene (BcP), a kind of PAH, or its metabolite 3-hydroxybenzo[c]phenanthrene (3-OHBcP) were investigated using GeneChip® oligonucleotide microarrays.
Project description:Coal tar pitch (CTP) is a byproduct of cooking process which is used in making coatings, corrosion protection materials, and electrode. and it has been verified that Coal tar pitch extract (CTPE) constitutes polycyclic aromatic hydrocarbons (PAHs) (87.91%) and monocyclic aromatic hydrocarbons, heterocyclic compounds and alkenes (the remaining total is 12.09%) using gas chromatography/mass spectrometry (GC/MS). In this study, we determine the lncRNA expression profile in CTPE group and control group. The key lncRNAs were screen out by using microarray analysis in defferent group.
Project description:To gain deeper insight into the mechanism of toxicity, it is important to identify and characterize miRNAs profiles involved in responses to specific classes of toxicants in conjunction with their impact on gene expression levels. However, few reports have described the effects of toxicants on miRNA expression profiles. Taking into account the prominent role of miRNAs in cancer development, progression, cell cycle control, and proliferation-related processes, it is likely that miRNAs are involved in the toxic response induced by carcinogens. Polycyclic aromatic hydrocarbons (PAHs) are a well-characterized class of human carcinogens. In the present study, we documented the different expression profiles of miRNAs in environmental carcinogen-exposed HepG2 cells by miRNA microarray analysis. To evaluate the change in miRNA expression levels, human hepatocellular carcinoma (HepG2) cells were exposed to two PAHs (benzo[a]anthracene, benzo[k]fluoranthene) for 48 h. miRNA expression analysis was conducted using a 8x16k human miRNA microarray (Agilent Technologies, USA).
Project description:Cytochrome P450 enzymes play an important role in bioactivating or detoxifying polycyclic aromatic hydrocarbons (PAHs). We exposed mice to doses of benzo[a]pyrene (BaP) or a mixture of PAHs to characterize dose- and time-response relationships of specific cytochrome P450s. Mice exposed to the highest PAH exposures exhibited 1.7-5-fold higher intrinsic clearance rates for BaP, compared to controls, and higher Vmax values, indicating higher amounts of enzymes capable of metabolizing BaP. This study demonstrates that PAHs induce enzymes in dose- and time-dependent patterns in animal models at exposure levels researchers use to characterize hazards and at relevant human exposure levels to PAH mixtures found at Superfund sites. Accounting for these potential changes in enzyme profiles, relative rates of PAH bioactivation and detoxification, and resulting risk will help reduce uncertainty and improve risk assessments for PAHs at contaminated sites.
Project description:Degradation of polycyclic aromatic hydrocarbons (PAHs) such as naphthalene by anaerobic microorganisms is poorly understood. Strain NaphS2, an anaerobic sulfate reducing marine delta-proteobacterium is capable of using naphthalene and the aromatic compound benzoate, as well as pyruvate, as an electron donors in the presence of sulfate. In order to identify genes involved in the naphthalene degradation pathway, we compared gene expression in NaphS2 during growth on benzoate vs. pyruvate, naphthalene vs. pyruvate, and naphthalene vs benzoate.
Project description:Polycyclic Aromatic Hydrocarbons (PAHs) are diverse environmental pollutants associated with adverse human health effects. Many studies focus on the carcinogenic effects of a limited number of PAHs and there is an increasing need to understand mechanisms of developmental toxicity of more varied yet environmentally relevant PAHs. A previous study characterized the developmental toxicity of 123 PAHs in zebrafish. Based on phenotypic responses ranging from complete inactivity to acute mortality, we classified these PAHs into eight bins, selected 16 representative PAHs, and exposed developing zebrafish to the concentration of each PAH that induced 80% phenotypic effect. We conducted RNA sequencing at 48 h post fertilization to identify gene expression changes as a result of PAH exposure.
