Antiplatelet Effect and Selective Binding to Cyclooxygenase by Molecular Docking Analysis of 3-Alkylaminopropoxy-9,10-anthraquinone Derivatives

  • Gan Kim-Hong
    School of Pharmacy, Kaohsiung Medical University
  • Teng Chi-Huang
    School of Pharmacy, Kaohsiung Medical University
  • Lin Hsien-Cheng
    School of Technology for Medical Sciences, Kaohsiung Medical University
  • Chen Kun-Tze
    Department of Biological Science and Technology, China Medical University
  • Chen Yu-Chian
    Department of Biological Science and Technology, China Medical University
  • Hsu Mei-Feng
    Department of Biochemistry, China Medical University
  • Wang Jih-Pyang
    Department of Education and Research, Taichung Veterans General Hospital
  • Teng Che-Ming
    Pharmacological Institute, College of Medicine, National Taiwan University
  • Lin Chun-Nan
    School of Pharmacy, Kaohsiung Medical University Institute of Life Science, National Taitung University

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Abstract

In an effort to develop potent cytotoxic inhibitors of cyclooxygenase (COX), a series of cytotoxic 3-alkylaminopropoxy-9,10-anthraquinone derivatives was screened to evaluate their antiplatelet effect on washed rabbit platelets and human platelet-rich plasma (PRP). Thrombin, arachidonic acid (AA), collagen, and platelet-activating factor (PAF) induced platelet aggregations were potently inhibited by compounds 1, 2, and 3 (each at 300 μM). Of the compounds tested in human PRP, compounds 1, 8, and 10 showed significant inhibition of primary and secondary aggregation induced by epinephrine and had a weak inhibitory effect on cyclooxygenase-1 (COX-1). Molecular docking studies revealed that compounds, 1, 8, and 10 were bound in the active sites of COX-1. This indicated that the antiplatelet effect of these three compounds was partially mediated through the suppression of COX-1 activity and reduced thromboxane formation. It is concluded that the cytotoxic compounds 1, 8, and 10 may interfere the conversion of arachidonic acid to prostaglandin (PG)H2 in the active site of COX-1.

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