1. Binding and activity of bisphenol analogues to human peroxisome proliferator-activated receptor β/δ.
- Author
-
Li, Chuan-Hai, Zhang, Dong-Hui, Jiang, Li-Dan, Qi, Yuan, and Guo, Liang-Hong
- Subjects
BISPHENOL A ,PEROXISOME proliferator-activated receptors ,HYDROGEN bonding interactions ,BINDING site assay ,LIVER cells ,MOLECULAR docking ,REPORTER genes - Abstract
Several studies have indicated metabolic function disruption effects of bisphenol analogues through peroxisome proliferator-activated receptor (PPAR) alpha and gamma pathways. In the present study, we found for the first time that PPARβ/δ might be a novel cellular target of bisphenol analogues. By using the fluorescence competitive binding assay, we found seven bisphenol analogues could bind to PPARβ/δ directly, among which tetrabromobisphenol A (TBBPA, 18.38-fold) and tetrachlorobisphenol A (TCBPA, 12.06-fold) exhibited stronger binding affinity than bisphenol A (BPA). In PPARβ/δ-mediated luciferase reporter gene assay, the seven bisphenol analogues showed transcriptional activity toward PPARβ/δ. Bisphenol AF (BPAF), bisphenol F (BPF) and bisphenol B (BPB) even showed higher transcriptional activity than BPA, while TBBPA and TCBPA showed comparable activity with BPA. Moreover, in human liver HL-7702 cells, the bisphenol analogues promoted the expression of two PPARβ/δ target genes PDK4 and ANGPTL4. Molecular docking simulation indicated the binding potency of bisphenol analogues to PPARβ/δ might depend on halogenation and hydrophobicity and the transcriptional activity might depend on their binding affinity and hydrogen bond interactions. Overall, the PPARβ/δ pathway may provide a new mechanism for the metabolic function disruption of bisphenol analogues, and TBBPA and TCBPA might exert higher metabolic disruption effects than BPA via PPARβ/δ pathway. [Display omitted] • Bisphenol analogues directly bind to and activate PPARβ/δ receptor. • TBBPA and TCBPA exhibit stronger binding affinity with PPARβ/δ than BPA. • TBBPA and TCBPA exert higher PPARβ/δ disruption activity than BPA in HL-7702 cells. • Halogenation, hydrophobicity and hydrogen bond interactions play essential roles in binding and activity. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF