Chapter title |
Inhibition of UVB-Induced Nonmelanoma Skin Cancer: A Path from Tea to Caffeine to Exercise to Decreased Tissue Fat.
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Chapter number | 336 |
Book title |
Natural Products in Cancer Prevention and Therapy
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Published in |
Topics in current chemistry, July 2012
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DOI | 10.1007/128_2012_336 |
Pubmed ID | |
Book ISBNs |
978-3-64-234574-6, 978-3-64-234575-3
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Authors |
Conney, Allan H, Lou, You-Rong, Nghiem, Paul, Bernard, Jamie J, Wagner, George C, Lu, Yao-Ping, John M. Pezzuto, Nanjoo Suh, Allan H. Conney, You-Rong Lou, Paul Nghiem, Jamie J. Bernard, George C. Wagner, Yao-Ping Lu, Conney, Allan H., Bernard, Jamie J., Wagner, George C. |
Editors |
John M. Pezzuto, Nanjoo Suh |
Abstract |
Oral administration of green tea, black tea, or caffeine (but not the decaffeinated teas) inhibited ultraviolet B radiation (UVB)-induced skin carcinogenesis in SKH-1 mice. Studies with caffeine indicated that its inhibitory effect on the ATR/Chk1 pathway is an important mechanism for caffeine's inhibition of UVB-induced carcinogenesis. The regular teas or caffeine increased locomotor activity and decreased tissue fat. In these studies, decreased dermal fat thickness was associated with a decrease in the number of tumors per mouse. Administration of caffeine, voluntary exercise, and removal of the parametrial fat pads all stimulated UVB-induced apoptosis, inhibited UVB-induced carcinogenesis, and stimulated apoptosis in UVB-induced tumors. These results suggest that caffeine administration, voluntary exercise, and removal of the parametrial fat pads inhibit UVB-induced carcinogenesis by stimulating UVB-induced apoptosis and by enhancing apoptosis in DNA-damaged precancer cells and in cancer cells. We hypothesize that tissue fat secretes antiapoptotic adipokines that have a tumor promoting effect. |
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