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Type: Journal article
Title: Genistein inhibits growth of B16 melanoma cells in vivo and in vitro and promotes differentiation in vitro
Author: Record, I.
Broadbent, J.
King, R.
Dreosti, I.
Head, R.
Tonkin, A.
Citation: International Journal of Cancer, 1997; 72(5):860-864
Publisher: WILEY
Issue Date: 1997
ISSN: 0020-7136
Statement of
Ian R. Record, Jessica L. Broadbent, Roger A. King, Ivor E. Dreosti, Richard J. Head, Anne L. Tonkin
Abstract: Consumption of soy products has been linked to a reduced mortality and morbidity from a number of cancers. Genistein, one of the principal soy isoflavones, has been shown to inhibit the growth of a number of tumour cell lines in vitro; however, a role of genistein in retarding tumour growth in vivo is less well documented. In this study, in addition to examining the effects of genistein on the growth of murine B16 melanoma cells in vitro, we have examined the effects of feeding a genistein-rich diet on s.c. growth of these tumour cells in mice. In vitro, the melanoma cells showed an increase in sensitivity to genistein with increasing time of exposure, culminating in a 50% growth inhibition (IC50) at 12.5 μM after 7 days. Genistein at 25 μM induced micronucleus formation after 24 hr and at concentrations as low as 2.5 μM induced morphological changes indicative of differentiation. Growth of solid tumours implanted into female C57BL/6J mice was inhibited by 50% when mice were fed genistein for 1 week before and for 1 week after inoculation with B16 melanoma cells. Plasma genistein concentrations at the time of tumour removal were 1.1 μM, which is similar to levels reported in humans consuming diets high in soybeans or soybean products, while control animals had no detectable genistein in plasma. Our results provide additional in vivo evidence suggesting that genistein retards the growth of implanted tumours, adding further to studies suggesting that this isoflavonoid is a biologically active component of soy foods
Keywords: Tumor Cells, Cultured; Animals; Mice, Inbred C57BL; Mice; Melanoma; Genistein; Cytochalasin B; Etoposide; Growth Inhibitors; Antineoplastic Agents; Neoplasm Transplantation; Cell Division; Cell Differentiation; Dose-Response Relationship, Drug; Time Factors; Female
Description: Article first published online: 6 DEC 1998
Rights: © 1997 Wiley-Liss, Inc.
RMID: 0030003402
DOI: 10.1002/(SICI)1097-0215(19970904)72:5<860::AID-IJC24>3.0.CO;2-B
Appears in Collections:Pharmacology publications

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