3 years ago

Anti-estrogenic activity of tris(2,3-dibromopropyl) isocyanurate through disruption of co-activator recruitment: experimental and computational studies

Maoyong Song, Yu Pan, Aiqian Zhang, Wenjuan Zhang, Yong Liang, Ling Wang, Xun Li, Minjie Chen, Zhen Zhou, Huiming Cao

Abstract

As a potential endocrine disruptor, tris(2,3-dibromopropyl) isocyanurate (TBC) has previously been demonstrated to reduce expression of estrogen-dependent vitellogenin (vtg) mRNA in adult zebrafish. However, the underlying toxicity pathways and molecular mechanisms involved in TBC-induced endocrine disruption remain elusive. In the current study, E-Screen and MVLN assays were employed to explore the potential anti-estrogenic effects of TBC via the estrogen receptor α (ERα)-mediated signaling pathway. Within a dose range between 1 × 10− 9 and 1 × 10− 7 M, TBC significantly inhibited 17β-estradiol (E2)-induced cell proliferation in a breast cancer cell line. The luciferase activity induced by E2 was also significantly inhibited by TBC in a dose-dependent manner. Moreover, neither TBC nor E2 affected proliferation of the ERα-negative breast cancer cell line MDA-MB-231. These experimental results confirmed that TBC has anti-estrogenic effects by affecting the ERα-mediated signaling pathway. By comparing TBC with known antagonists of ERα, we found that TBC has similar molecular structure as certain co-activator binding inhibitors. Therefore, using molecular docking and molecular dynamics simulations, TBC was further predicted to competitively occupy the surface site of ERα rather than the canonical E2-binding pocket of ERα, thus disrupt subsequent co-activator recruitment and transcription activation. Our findings elucidate the anti-estrogenic mechanism of TBC at the atomic level and highlight the biological importance of surface sites of nuclear receptors for a risk assessment of potential environmental pollutants.

Publisher URL: https://link.springer.com/article/10.1007/s00204-018-2159-2

DOI: 10.1007/s00204-018-2159-2

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