BPA, DBP and PFOA mix acts additively at ERα
- A biomonitoring-informed mixture of BPA, DBP and PFOA was tested as a model of environmental estrogen co-exposure.
- Each chemical and the mixture promoted MCF-7 cell proliferation, and the mixture's dose-response stayed within the additivity range of both concentration and response addition models, leaning toward concentration addition.
- ER transcription and cell-free biosensor assays showed ERα agonism and fitted concentration addition better, pointing to receptor activation as central to the additive effect.
💡 Points
Additivity in MCF-7 proliferation is what three ERα agonists should produce, so this reads as confirmation rather than surprise. PFOA and DBP are weak or indirect ER actors, though, and MCF-7 over-reports estrogenic output. With no measured free internal concentrations or in vivo uterotrophic data, whether biomonitoring-level exposure reaches a receptor-relevant range stays unanswered.