Inhibition of cyclooxygenase/lipoxygenase from human platelets by polyhydroxylated/methoxylated flavonoids isolated from medicinal plants

  • Kun Man You
  • Hyon-Gun Jong
  • Hyun Pyo Kim
Research Articles Biochemistry & Cell Biology


Various flavonoid derivatives were previously reported to possess the inhibitory activity on cyclooxygenase/lipoxygenase. And these properties of flavonoids might contribute to their antiinflammatory activityin vivo. In this study, several polyhydroxylated/methoxylated flavonoid derivatives such as oroxylin A, wogonin, skullcapflavone II, tectorigenin and iristectorigenin A were isolated from the medicinal plants. These compounds were evaluated for their inhibitory effects on cyclooxygenase/lipoxygenase from the homogenate of human plateletsin vitro. It was found that isoflavones including daidzein and tectorigenin possessed the inhibitory activity on cyclooxygenase, although the potency of inhibition was far less than that of indomethacin. In addition, oroxylin A, baicalein and wogonin inhibited 12-lipoxygenase activity without affecting cyclooxygenase, which suggested that 5,6,7- or 5,7,8-trisubstitutions of A-ring of flavone gave favorable results. The IC50 values of oroxylin A and NDGA aginst 12-lipoxygenase were found to be 100 and 1.5 uM, respectively.

Key words

Flavonoid Cyclooxygenase Lipoxygenase Platelet Oroxylin A Tectorigenin 

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Copyright information

© The Pharmaceutical Society of Korea 1999

Authors and Affiliations

  • Kun Man You
    • 1
  • Hyon-Gun Jong
    • 1
  • Hyun Pyo Kim
    • 1
  1. 1.College of PharmacyKangwon National UniversityChunchonKorea

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