Estrogenic/Antiestrogenic Activities of Quinoid Polycyclic Aromatic Hydrocarbons

  • Hayakawa Kazuichi
    Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Bekki Kanae
    Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Yoshita Morio
    Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Tachikawa Chihiro
    Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Kameda Takayuki
    Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Tang Ning
    Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Toriba Akira
    Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Hosoi Shinzo
    The Research Center for Pharmacy Education, Kyoto Pharmaceutical University

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Abstract

Estrogenic and antiestrogenic activities of 19 quinoid polycyclic aromatic hydrocarbons (PAHQs) and 9 ketone PAHs were evaluated by the yeast two-hybrid assay using yeast cells expressing estrogen receptor-α (ERα). Binding affinity of PAHQs to ERα was assayed by the polarized fluorescence method using FluormoneTM ES2. Ten PAHQs having 3-5 rings showed antiestrogenic activities. The most strongly antiestrogenic PAHQs were 1,4-chrysenequinone and 5,6-chrysenequinone. On the other hand, benzo[a]pyrene-3,6-quinone showed the strongest estrogenic activity. However, the other compounds tested did not show so strong estrogenic/antiestrogenic activities. Binding affinity to ER was required but not sufficient for estrogenic/antiestrogenic activities of PAHQs. The length-to-breadth ratios of the rectangular planes surrounding the ring molecules and the distances between the oxygen atom of the carbonyl group and farthest hydrogen atom of estrogenic/antiestrogenic PAHQs were in narrow ranges, suggesting a structure-activity relationship. As interactions between active PAHQ and ER, hydrogen bonding between carbonyl groups and amino acid residues and van der Waals forces were considered.

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