Profiling of benzophenone derivatives using fish and human estrogen receptor-specific in vitro bioassays

Toxicology and Applied Pharmacology
José-Manuel Molina-MolinaPatrick Balaguer

Abstract

Benzophenone (BP) derivatives, BP1 (2,4-dihydroxybenzophenone), BP2 (2,2',4,4'-tetrahydroxybenzophenone), BP3 (2-hydroxy-4-methoxybenzophenone), and THB (2,4,4'-trihydroxybenzophenone) are UV-absorbing chemicals widely used in pharmaceutical, cosmetics, and industrial applications, such as topical sunscreens in lotions and hair sprays to protect skin and hair from UV irradiation. Studies on their endocrine disrupting properties have mostly focused on their interaction with human estrogen receptor alpha (hERalpha), and there has been no comprehensive analysis of their potency in a system allowing comparison between hERalpha and hERbeta activities. The objective of this study was to provide a comprehensive ER activation profile of BP derivatives using ER from human and fish origin in a battery of in vitro tests, i.e., competitive binding, reporter gene based assays, vitellogenin (Vtg) induction in isolated rainbow trout hepatocytes, and proliferation based assays. The ability to induce human androgen receptor (hAR)-mediated reporter gene expression was also examined. All BP derivatives tested except BP3 were full hERalpha and hERbeta agonists (BP2>THB>BP1) and displayed a stronger activation of hERbeta compared with hERalpha, the...Continue Reading

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