Simply and perhaps intuitively defined, endocrine disruption is the abnormal modulation of normal hormonal physiology by exogenous chemicals. In fish, endocrine disruption of the reproductive system has been observed worldwide in numerous species and is known to affect both males and females. Observations of biologically relevant endocrine disruption most commonly occurs near waste water treatm...

The occurrence of five endocrine-disrupting compounds (EDCs), namely 4-n-nonylphenol (4-n-NP), nonylphenol monoethoxylate (NP1EO), nonylphenol diethoxylate (NP2EO), triclosan (TCS) and bisphenol A (BPA), was assessed in the raw, treated wastewater and sewage sludge of eight sewage treatment plants (STPs) in Greece. The analytes were extracted by solid-phase extraction (dissolved phase) or sonic...

The efficacy of estrogenic chemicals and plant materials were assessed to stimulate the vitellogenin (VTG) synthesis in an in vitro system based on primary cultures of hepatocytes from female and E2-primed male Mozambique tilapia, Oreochromis mossambicus. Isolated hepatoyctes treated with nonylphenol (NP), bisphenol-A (BP), octylphenol (OP), hexachlorocyclohexane (HCH) and the combination (ALL)...

Compound-specific stable isotope analysis (CSIA) is an efficient method for source apportionment and the identification of transformation process in organic compounds. However, most studies CSIA are still limited to laboratory experiments. Few used have situ environment due complexity environmental samples. Therefore, a purification analyzing carbon ratios three phenolic endocrine disrupting co...

Endocrine disrupting chemicals (EDCs) are exogenous chemicals that may occur naturally (e.g., phytoestrogens), while others are industrial substances and plasticizers commonly utilized worldwide to which human exposure, particularly at low-doses, is omnipresent, persistent and occurs in complex mixtures. EDCs can interfere with/or mimic estrogenic hormones and, consequently, can simultaneously ...

We determined the concentrations of 12 endocrine disrupting chemicals (EDCs) in sewage effluents collected from three different sewage treatment plants (STPs) in Hong Kong, and found 4-nonylphenol (NP) and bisphenol A (BPA) were the most abundant EDCs. Effluent concentrations of NP and BPA were higher in dry season than in wet season, but opposite seasonal changes of NP were observed in receivi...

This review discusses various methodologies that can be used to understand, at the gene level, the consequences to fish upon exposure to endocrine disrupting compounds (EDCs). Several approaches for measuring expression of gene transcripts are discussed, including directed approaches, such as Northern blotting and quantitative reverse transcriptase polymerase chain reaction (RT-PCR) as well as ...

Computational tools, such as quantitative structure-activity relationship (QSAR), are highly useful as screening support for prioritization of substances of very high concern (SVHC). From the practical point of view, QSAR models should be effective to pick out more active rather than inactive compounds, expressed as sensitivity in classification works. This research investigates the classificat...

Introduction There is growing environmental concern regarding the health impact of trace levels of pharmaceuticals and personal care products (PPCPs) in the environment. PPCPs and endocrine disrupting chemicals (EDCs) detected in surface and drinking waters, as well as in treated wastewater, are an issue of increasing international attention due to potential environmental impacts.1,2 These comp...

Although understanding the environmental factors that contribute to breast cancer could improve disease prevention, standard chemical testing protocols do not adequately evaluate chemicals' effects on breast development. Evidence suggests: (1) mammary gland (MG) development is a complex process that extends from gestation through fetal and neonatal growth, puberty, and pregnancy; (2) altered MG...