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The Pharmaceutical Society of Korea (대한약학회)
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Inhibition of Arachidonate Release From Rat Peritoneal Macrophage by Biflavonoids

  • Lee, Song-Jin (College of Pharmacy, Kangwon National University) ;
  • Son, Kun-Ho (Department Food Nutrition, Andong National University) ;
  • Chang, Hyeun-Wook (College of Pharmacy, Yeungnam University) ;
  • Kang, Sam-Sik (Natural Products Research Institute, Seoul National University) ;
  • Kim, Hyun-Pyo (College of Pharmacy, Kangwon National University)
  • Published : 1997.12.01
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Abstract

Biflavonoid is one of unique classes of naturally-occurring bioflavonoid. Previously, certain biflavonoids were found to possess the inhibitory effects on phospholipase $A_2$ activity and lymphocytes $ proliferation^1$ suggesting their anti-inflammatory/immunoregulatory potential. In this study, effects of several biflavonoids on arachidonic acid release from rat peritoneal macrophages were investigated, because arachidonic acid released from the activated macrophages is one of the indices of inflammatory conditions. When resident peritoneal macrophages labeled with $[^{3}H]$arachidonic acid were activated by phorbol 12-myristate 13-acetate(PMA) or calcium ionophore, A23187, radioactivity released in the medium was increased approximately 4.1-7.3 fold after 120 min incubation compared to the spontaneous release in the control incubation. In this condition, biflavonoids (10 uM) such as ochnaflavone, ginkgetin and isoginkgetin, showed inhibition of arachidonate release from macrophages activated by PMA (32.5-40.0% inhibition) or A23187 (21.7-41.7% inhibition). Amentoflavone showed protection only against PMA-induced arachidonate release, while apigenin, a monomer of these biflavonoids, did not show the significant inhibition up to 10 uM. Staurosporin (1 uM), a protein kinase C inhibitor, showed an inhibitory effect only against PMA-induced arachidonate release (96.8% inhibition). Inhibition of arachidonate release from the activated macrophages may contribute to an anti-inflammatory potential of biflavonoids in vivo.

Keywords

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