E-screen assay validation: evaluation of estrogenic activity by MCF7 cell culture bioassay, in drinking water from different watersheds in state of São Paulo, Brazil

Abstract— Natural and synthetic estrogens have been detected in rivers, lakes and estuaries in many parts of the world. Primary sources of these compounds are domestic and industrial effluents, which are not deleted after the water treatment. Estrogen has been the endocrine disruptor most researched to be very active biologically and be the etiologic agent of diverse types of cancer and other conditions such as endometriosis, precocious puberty, feminization, masculinization, sterility. In this context, we use water of 36 natural reservoirs or dams, in a bioassay to characterize their estrogenicity in culture of MCF7 cells and obtained high concentration of estrogen in samples taken in Ibiúna and Equestrian Santo Amaro / SP. However, certain concentration in our samples for most water samples from different regions was very close to the limit of quantification by bioassay and estrogen was in fmol. It has been shown that e – screen assay with MCF7 cells is a sensitive and stable tool for quantitative analysis of estrogenicity of water and can easily be developed and implemented for routine for estrogen quantification also in animal food and man, aqueous and plastics etc.

Keywords endocrine disrupters, estrogen, breast cancer cells, (MCF7) bioassay: E-screen assay.

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Agriculture Journal- E-screen assay validation: evaluation of estrogenic activity by MCF7 cell culture bioassay, in drinking water from different watersheds in state of São Paulo, Brazil

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