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• W2093229118 abstract "Xenobiotics may cause long-term adverse effects in humans, especially at the embryonic level, raising questions about their levels of exposure, combined effects, and crucial endpoints. We are interested in the possible interactions between xenobiotic endocrine disrupters, cellular viability and androgen metabolism. Accordingly, we tested aroclor 1254 (A1254), atrazine (AZ), o,p′-DDT, vinclozolin (VZ), p,p′-DDE, bisphenol A (BPA), chlordecone (CD), nonylphenol (NP), tributylin oxide (TBTO), and diethylstilbestrol (DES) for cellular toxicity against human embryonic 293 cells, and activity against cellular aromatase, but also on placental microsomes and on the purified equine enzyme. Cellular viability was affected in 24 h by all the xenobiotics with a threshold at 50 μM (except for TBTO and DES, 10 μM threshold), and aromatase was inhibited at non-toxic doses. In combination synergism was observed reducing the threshold values of toxicity to 4–10 μM, and aromatase activity by 50% in some cases. In placental microsomes the most active xenobiotics rapidly inhibited microsomal aromatase in a manner independent of NADPH metabolism. Prolonged exposures to low doses in cells generally amplified by 50 times aromatase inhibition. These xenobiotics may act by inhibition of the active site or by allosteric effects on the enzyme. Bioaccumulation is a feature of some xenobiotics, especially chlordecone, DDT and DDE, and low level chronic exposures can also affect cell signaling mechanisms. This new information about the mechanism of action of these xenobiotics will assist in improved molecular design with a view to providing safer compounds for use in the (human) environment." @default.
• W2093229118 created "2016-06-24" @default.
• W2093229118 creator A5023439299 @default.
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• W2093229118 creator A5063020426 @default.
• W2093229118 creator A5091150707 @default.
• W2093229118 date "2007-07-15" @default.
• W2093229118 modified "2023-10-17" @default.
• W2093229118 title "Cytotoxic effects and aromatase inhibition by xenobiotic endocrine disrupters alone and in combination☆" @default.
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• W2093229118 doi "https://doi.org/10.1016/j.taap.2007.03.033" @default.
• W2093229118 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17599374" @default.
• W2093229118 hasPublicationYear "2007" @default.
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