Biological and Pharmaceutical Bulletin
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ISSN-L : 0918-6158
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Tectorigenin, an Isoflavone of Pueraria thunbergiana BENTH., Induces Differentiation and Apoptosis in Human Promyelocytic Leukemia HL-60 Cells
Kyung-Tae LEEIl-Cheol SOHNYoung-Kwan KIMJung-Hye CHOIJong-Won CHOIHee-Juhn PARKYoshie ITOHKen-ichi MIYAMOTO
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2001 Volume 24 Issue 10 Pages 1117-1121

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Abstract

Cytotoxic effects of six isoflavonoids, tectorigenin, glycitein, tectoridin, glycitin, 6''-O-xylosyltectoridin, and 6''-O-xylosylglycitin isolated from the flower of Pueraria thunbergiana BENTH. together with genistein, a known differentiation and apoptosis inducer, were examined. Among these isoflavonoids, tectorigenin and genistein exhibited cytotoxicity against various human cancer cells; glycitein showed only mild cytotoxicity. These results suggest that the isoflavone structure and 5-hydroxyl group are crucial for the cytotoxic properties and that glycosides are inactive. Moreover, tectorigenin induced differentiation of human promyelocytic leukemia HL-60 cells to granulocytes and monocytes/macrophages, and caused apoptotic changes of DNA in the cells, as did genistein. Tectorigenin also inhibited autophosphorylation of epidermal growth factor (EGF) receptor by EGF and decreased the expression of Bcl-2 protein, with less activity than genistein. From these results, tectorigenin may be a possible therapeutic agent for leukemia.

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© 2001 The Pharmaceutical Society of Japan
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