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Inhibitory Effects of Orally Administered Green Tea, Black Tea, and Caffeine on Skin Carcinogenesis in Mice Previously Treated with Ultraviolet B Light (High-Risk Mice): Relationship to Decreased Tissue Fat 1

By Yao-ping Lu, You-rong Lou, Yong Lin, Weichung Joe Shih, Mou-tuan Huang, Chung S. Yang and Allan H. Conney


Treatment of SKH-1 hairless mice with ultraviolet B light (UVB; 30 mJ/cm 2) twice a week for 22 weeks resulted in tumor-free animals with a high risk of developing malignant and nonmalignant skin tumors during the next several months in the absence of additional UVB treatment (high-risk mice). Oral administration of green tea or black tea (6 mg tea solids/ml) to UVB-pretreated high-risk SKH-1 mice for 23 weeks after stopping UVB treatment decreased the number of tumors/mouse, decreased the size of the parametrial fat pads, and decreased the thickness of the dermal fat layer away from tumors and directly under tumors. Administration of the decaffeinated teas had little or no effect on these parameters, and adding caffeine (equivalent to the amount in the regular teas) to the decaffeinated teas restored their inhibitory effects. Administration of caffeine alone also decreased the number of tumors/mouse, the size of the parametrial fat pads, and the thickness of the dermal fat laye

Year: 2013
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