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Planta Med 1999; 65(5): 408-412
DOI: 10.1055/s-1999-14016
Original Paper

Georg Thieme Verlag Stuttgart · New York

Sophoricoside Analogs as the IL-5 Inhibitors from Sophora japonica

Bokgi Min1 , Sei Ryang Oh2 , Hyeong-Kyu Lee2 , Kiyoshi Takatsu3 , Il-Moo Chang4 , Kyung Rak  Min1 , Youngsoo Kim1
  • 1 College of Pharmacy, Chungbuk National University, Cheongju, Korea
  • 2 Natural Product Biosynthesis Research Unit, Korea Research Institute of Bioscience & Biotechnology, Taejon, Korea
  • 3 Institute of Medical Science, University of Tokyo, Tokyo, Japan
  • 4 Natural Products Research Institute, Seoul National University, Seoul, Korea
Further Information

Publication History

October 6, 1998

February 27, 1999

Publication Date:
31 December 1999 (online)

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Abstract

Fruits of Sophora japonica L. (Leguminosae) exhibited an inhibitory effect in the IL-5 bioassay of mIL-5-dependent Y16 proliferation. The isoflavonoids of sophoricoside, genistein, orobol, and genistin were isolated as the IL-5 inhibitors from fresh fruits of the plant by activity-guided fractionation. Among the IL-5 inhibitors, sophoricoside exhibited the highest inhibitory effect with 89 % inhibition at 12.5 μM, 82 % at 6.3 μM, 72 % at 3.1 μM, 59 % at 1.6 μM, and 24 % at 0.8 μM where the 50 % inhibition (IC50) was shown at the concentration of 1.5 μM. Oxyphenylbutazone as the positive control exhibited the IC50 value at the concentration of 31.7 μM. In the order of IC50 values the inhibitory potency in the IL-5 bioassay was sophoricoside > orobol (9.8 μM) % genistin (10.6 μM) > genistein (51.9 μM). The position of O-glycosylation and number of hydroxy groups in the isoflavonoids seem to play an important role in the inhibitory effect in the IL-5 bioassay.

Key words:

Sophora japonica - Leguminosae - IL-5 inhibitor - sophoricoside - genistein - orobol - genistin