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Inhibitory effect of topical applications of nondenatured soymilk on the formation and growth of UVB-induced skin tumors.

Mou-tuan Huang,Jian-Guo Xie,Connie B. Lin,Menas G. Kizoulis,M. Seiberg,S. Shapiro,A. Conney

Published 2004 in Oncology Research

ABSTRACT

Treatment of female SKH-1 hairless mice with ultraviolet B light twice a week for 20 weeks resulted in a population of tumor-free mice with a high risk of developing skin tumors during the next several months in the absence of additional UVB treatment (high-risk mice). Topical applications of nondenatured soymilk but not heat-denatured soymilk once a day, 5 days a week to these high-risk mice inhibited the formation and growth of skin tumors. Similar topical applications of soybean trypsin inhibitor or Bowman-Birk inhibitor also inhibited the formation and growth of skin tumors, but these agents were less active than nondenatured soymilk. Treatment of miniswine skin with nondenatured soymilk once a day for 5 days prior to UVB irradiation reduced or completely eliminated UVB-induced formation of thymine dimers and apoptotic cells in the epidermis. These data suggest that nondenatured soymilk could be applied to humans to prevent sunlight-induced skin damage and to reduce the risk of skin tumor formation and progression.

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